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Hisham Alabduljabbar
Department of Civil Engineering, College of Engineering in Al-Kharj, Prince Sattam bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia

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Journal article
Published: 30 August 2021 in Materials
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Artificial intelligence and machine learning are employed in creating functions for the prediction of self-compacting concrete (SCC) strength based on input variables proportion as cement replacement. SCC incorporating waste material has been used in learning approaches. Artificial neural network (ANN) support vector machine (SVM) and gene expression programming (GEP) consisting of 300 datasets have been utilized in the model to foresee the mechanical property of SCC. Data used in modeling consist of several input parameters such as cement, water–binder ratio, coarse aggregate, fine aggregate, and fly ash (FA) in combination with the superplasticizer. The best predictive models were selected based on the coefficient of determination (R2) results and model validation. Empirical relation with mathematical expression has been proposed using ANN, SVM, and GEP. The efficiency of the models is assessed by permutation features importance, statistical analysis, and comparison between regression models. The results reveal that the proposed machine learning models achieved adamant accuracy and has elucidated performance in the prediction aspect.

ACS Style

Furqan Farooq; Slawomir Czarnecki; Pawel Niewiadomski; Fahid Aslam; Hisham Alabduljabbar; Krzysztof Adam Ostrowski; Klaudia Śliwa-Wieczorek; Tomasz Nowobilski; Seweryn Malazdrewicz. A Comparative Study for the Prediction of the Compressive Strength of Self-Compacting Concrete Modified with Fly Ash. Materials 2021, 14, 4934 .

AMA Style

Furqan Farooq, Slawomir Czarnecki, Pawel Niewiadomski, Fahid Aslam, Hisham Alabduljabbar, Krzysztof Adam Ostrowski, Klaudia Śliwa-Wieczorek, Tomasz Nowobilski, Seweryn Malazdrewicz. A Comparative Study for the Prediction of the Compressive Strength of Self-Compacting Concrete Modified with Fly Ash. Materials. 2021; 14 (17):4934.

Chicago/Turabian Style

Furqan Farooq; Slawomir Czarnecki; Pawel Niewiadomski; Fahid Aslam; Hisham Alabduljabbar; Krzysztof Adam Ostrowski; Klaudia Śliwa-Wieczorek; Tomasz Nowobilski; Seweryn Malazdrewicz. 2021. "A Comparative Study for the Prediction of the Compressive Strength of Self-Compacting Concrete Modified with Fly Ash." Materials 14, no. 17: 4934.

Journal article
Published: 18 August 2021 in Sustainability
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This study investigated the optimization of the bioconcrete engineering properties and durability as a response of the calcium lactate (CL) content (0.22–2.18 g/L) and curing duration (7–28 days) using the response surface methodology (RSM). Scanning electronic microscopy (SEM) was conducted to evaluate the microstructure of calcium precipitated inside the bioconcrete. The results indicated that the optimal conditions for the engineering properties of concrete and durability were determined at 2.18 g/L of CL content after 23.4 days. The actual and predicted values of the compressive strength, splitting tensile strength, flexural strength, and water absorption were 43.51 vs. 43.43, 3.19 vs. 3.19, 6.93 vs. 5.50, and 7.55 vs. 7.55, respectively, with a level of confidence exceeding 95%. The scanning electron microscope (SEM) images and energy-dispersive X-ray spectroscopy (EDX) proved that the amount of calcium increased with the increase in CL content up to 2.81 g/L at 23.4 days, reducing the pores inside the concrete and making it a great potential option for healing of concrete structures.

ACS Style

Saddam Hussein Abo Sabah; Luis Hii Anneza; Mohd Irwan Juki; Hisham Alabduljabbar; Norzila Othman; Adel Ali Al-Gheethi; Abdullah Faisal Al-Shalif. The Use of Calcium Lactate to Enhance the Durability and Engineering Properties of Bioconcrete. Sustainability 2021, 13, 9269 .

AMA Style

Saddam Hussein Abo Sabah, Luis Hii Anneza, Mohd Irwan Juki, Hisham Alabduljabbar, Norzila Othman, Adel Ali Al-Gheethi, Abdullah Faisal Al-Shalif. The Use of Calcium Lactate to Enhance the Durability and Engineering Properties of Bioconcrete. Sustainability. 2021; 13 (16):9269.

Chicago/Turabian Style

Saddam Hussein Abo Sabah; Luis Hii Anneza; Mohd Irwan Juki; Hisham Alabduljabbar; Norzila Othman; Adel Ali Al-Gheethi; Abdullah Faisal Al-Shalif. 2021. "The Use of Calcium Lactate to Enhance the Durability and Engineering Properties of Bioconcrete." Sustainability 13, no. 16: 9269.

Journal article
Published: 10 August 2021 in Materials
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In the current study, the utilization of glass and nylon fibers in various percentages are added to enhance the mechanical performance of peach shell lightweight concrete. Glass and nylon fibers were added at 2%, 4%, 6%, and 8% by cement weight. The results showed that, as we added the glass and nylon fibers, the density of peach shell concrete was reduced by 6.6%, and the compressive, split tensile and flexural strength were enhanced by 10.20%, 60.1%, and 63.49%. The highest strength that was obtained in compressive, split tensile, and flexural strength at 56 days was 29.4 MPa, 5.2 MPa, and 6.3 MPa, respectively, with 6% of glass fiber in peach shell concrete. Mechanical test results showed that post-failure toughness and modulus of elasticity of peach shell concrete is enhanced with the utilization of fibers. To verify our lab results, a statistical analysis, such as response surface methodology, was performed to make a statistical model, it was confirmed by both lab results and statistical analysis that the mechanical performance of peach shell concrete could be significantly improved by adding glass fibers as compared to nylon fibers. With the use of fibers, the water absorption and porosity were slightly increased. Hence, the glass and nylon fibers can be used to improve the peach shell concrete mechanical properties to make concrete eco-friendly, sustainable, and lightweight.

ACS Style

Jawad Ahmad; Osama Zaid; Fahid Aslam; Muhammad Shahzaib; Rahat Ullah; Hisham Alabduljabbar; Khaled Mohamed Khedher. A Study on the Mechanical Characteristics of Glass and Nylon Fiber Reinforced Peach Shell Lightweight Concrete. Materials 2021, 14, 4488 .

AMA Style

Jawad Ahmad, Osama Zaid, Fahid Aslam, Muhammad Shahzaib, Rahat Ullah, Hisham Alabduljabbar, Khaled Mohamed Khedher. A Study on the Mechanical Characteristics of Glass and Nylon Fiber Reinforced Peach Shell Lightweight Concrete. Materials. 2021; 14 (16):4488.

Chicago/Turabian Style

Jawad Ahmad; Osama Zaid; Fahid Aslam; Muhammad Shahzaib; Rahat Ullah; Hisham Alabduljabbar; Khaled Mohamed Khedher. 2021. "A Study on the Mechanical Characteristics of Glass and Nylon Fiber Reinforced Peach Shell Lightweight Concrete." Materials 14, no. 16: 4488.

Journal article
Published: 23 June 2021 in Materials
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The majority of experimental and analytical studies on fiber-reinforced polymer (FRP) confined concrete has largely concentrated on plain (unreinforced) small-scale concrete columns, on which the efficiency of strengthening is much higher compared with large-scale columns. Although reinforced concrete (RC) columns subjected to combined axial compression and flexural loads (i.e., eccentric compression) are the most common structural elements used in practice, research on eccentrically-loaded FRP-confined rectangular RC columns has been much more limited. More specifically, the limited research has generally been concerned with small-scale RC columns, and hence, the proposed eccentric-loading stress-strain models were mainly based on the existing concentric-loading models of FRP-confined concrete columns of small scale. In the light of such demand to date, this paper is aimed at developing a mathematical model to better predict the strength of FRP-confined rectangular RC columns. The strain distribution of FRP around the circumference of the rectangular sections was investigated to propose equations for the actual rupture strain of FRP wrapped in the horizontal and vertical directions. The model was accomplished using 230 results of 155 tested specimens compiled from 19 studies available in the technical literature. The test database covers an unconfined concrete strength ranging between 9.9 and 73.1 MPa, and section’s dimension ranging from 100–300 mm and 125–435 mm for the short and long sides, respectively. Other test parameters, such as aspect ratio, corner radius, internal hoop steel reinforcement, FRP wrapping layout, and number of FRP wraps were all considered in the model. The performance of the model shows a very good correlation with the test results.

ACS Style

Haytham Isleem; Muhammad Abid; Wesam Alaloul; Muhammad Shah; Shayan Zeb; Muhammad Musarat; Muhammad Javed; Fahid Aslam; Hisham Alabduljabbar. Axial Compressive Strength Models of Eccentrically-Loaded Rectangular Reinforced Concrete Columns Confined with FRP. Materials 2021, 14, 3498 .

AMA Style

Haytham Isleem, Muhammad Abid, Wesam Alaloul, Muhammad Shah, Shayan Zeb, Muhammad Musarat, Muhammad Javed, Fahid Aslam, Hisham Alabduljabbar. Axial Compressive Strength Models of Eccentrically-Loaded Rectangular Reinforced Concrete Columns Confined with FRP. Materials. 2021; 14 (13):3498.

Chicago/Turabian Style

Haytham Isleem; Muhammad Abid; Wesam Alaloul; Muhammad Shah; Shayan Zeb; Muhammad Musarat; Muhammad Javed; Fahid Aslam; Hisham Alabduljabbar. 2021. "Axial Compressive Strength Models of Eccentrically-Loaded Rectangular Reinforced Concrete Columns Confined with FRP." Materials 14, no. 13: 3498.

Journal article
Published: 17 May 2021 in Crystals
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The present research aims at evaluating the mechanical performance of untreated and treated crumb rubber concrete (CRC). The study was also conducted to reduce the loss in mechanical properties of CRC. In this study, sand was replaced with crumb rubber (CR) with 0%, 5%, 10%, 15%, and 20% by volume. CR was treated with NaOH, lime, and common detergent for 24 h. Furthermore, water treatment was also carried out. All these treatments were done to enhance the mechanical properties of concrete that are affected by adding CR. The properties that were evaluated are compressive strength, indirect tensile strength, unit weight, ultrasonic pulse velocity, and water absorption. Compressive strength was assessed after 7 and 28 days of curing. The mechanical properties were decreased by increasing the percentage of the CR. The properties were improved after the treatment of CR. Lime treatment was found to be the best treatment of all four treatments followed by NaOH treatment and water treatment. Detergent treatment was found to be the worse treatment of all four methods of treatment. Despite increasing the strength it contributed to strength loss.

ACS Style

Hamad Awan; Muhammad Javed; Adnan Yousaf; Fahid Aslam; Hisham Alabduljabbar; Amir Mosavi. Experimental Evaluation of Untreated and Pretreated Crumb Rubber Used in Concrete. Crystals 2021, 11, 558 .

AMA Style

Hamad Awan, Muhammad Javed, Adnan Yousaf, Fahid Aslam, Hisham Alabduljabbar, Amir Mosavi. Experimental Evaluation of Untreated and Pretreated Crumb Rubber Used in Concrete. Crystals. 2021; 11 (5):558.

Chicago/Turabian Style

Hamad Awan; Muhammad Javed; Adnan Yousaf; Fahid Aslam; Hisham Alabduljabbar; Amir Mosavi. 2021. "Experimental Evaluation of Untreated and Pretreated Crumb Rubber Used in Concrete." Crystals 11, no. 5: 558.

Journal article
Published: 16 May 2021 in Crystals
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Numerous research studies have been conducted to improve the weak properties of recycled aggregate as a construction material over the last few decades. In two-stage concrete (TSC), coarse aggregates are placed in formwork, and then grout is injected with high pressure to fill up the voids between the coarse aggregates. In this experimental research, TSC was made with 100% recycled coarse aggregate (RCA). Ten percent and twenty percent bagasse ash was used as a fractional substitution of cement along with the RCA. Conventional concrete with 100% natural coarse aggregate (NCA) and 100% RCA was made to determine compressive strength only. Compressive strength reduction in the TSC was 14.36% when 100% RCA was used. Tensile strength in the TSC decreased when 100% RCA was used. The increase in compressive strength was 8.47% when 20% bagasse ash was used compared to the TSC mix that had 100% RCA. The compressive strength of the TSC at 250 °C was also determined to find the reduction in strength at high temperature. Moreover, the compressive and tensile strength of the TSC that had RCA was improved by the addition of bagasse ash.

ACS Style

Muhammad Javed; Afaq Durrani; Sardar Kashif Ur Rehman; Fahid Aslam; Hisham Alabduljabbar; Amir Mosavi. Effect of Recycled Coarse Aggregate and Bagasse Ash on Two-Stage Concrete. Crystals 2021, 11, 556 .

AMA Style

Muhammad Javed, Afaq Durrani, Sardar Kashif Ur Rehman, Fahid Aslam, Hisham Alabduljabbar, Amir Mosavi. Effect of Recycled Coarse Aggregate and Bagasse Ash on Two-Stage Concrete. Crystals. 2021; 11 (5):556.

Chicago/Turabian Style

Muhammad Javed; Afaq Durrani; Sardar Kashif Ur Rehman; Fahid Aslam; Hisham Alabduljabbar; Amir Mosavi. 2021. "Effect of Recycled Coarse Aggregate and Bagasse Ash on Two-Stage Concrete." Crystals 11, no. 5: 556.

Technical paper
Published: 09 May 2021 in Structural Concrete
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Industrial waste has rapidly increased day by day due to the fast‐growing population and usage of products, which dumps unscrupulously, resulting in environmental pollutions. Waste foundry sand (WFS) is one of the industrial solid wastes. River sand is generally used in concrete as a fine aggregate, which is limited (scant), and river excavation for sand leads to environmental deterioration. To resolve these problems, a study was performed on WFS as a partial substitution instead of natural sand in concrete. The effects of WFS on concrete performance were assessed through durability and mechanical performance. The results from experimental tests show that, compared to concrete blends with WFS up to 30% substitution, the control mix strength was only 7.6% (28 days) higher, and this improvement is not too high. In the same manner, concrete mixtures that contain WFS up to 30%, and their durability properties were somewhat same to blank max (control). Test results showed that WFS with a substitutions ratio up to 30% can be successfully used in concrete without disturbing its durability and strength properties.

ACS Style

Jawad Ahmad; Fahid Aslam; Osama Zaid; Rayed Alyousef; Hisham Alabduljabbar. Mechanical and durability characteristics of sustainable concrete modified with partial substitution of waste foundry sand. Structural Concrete 2021, 1 .

AMA Style

Jawad Ahmad, Fahid Aslam, Osama Zaid, Rayed Alyousef, Hisham Alabduljabbar. Mechanical and durability characteristics of sustainable concrete modified with partial substitution of waste foundry sand. Structural Concrete. 2021; ():1.

Chicago/Turabian Style

Jawad Ahmad; Fahid Aslam; Osama Zaid; Rayed Alyousef; Hisham Alabduljabbar. 2021. "Mechanical and durability characteristics of sustainable concrete modified with partial substitution of waste foundry sand." Structural Concrete , no. : 1.

Journal article
Published: 03 May 2021 in Ain Shams Engineering Journal
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An acceptable viscosity and an easy penetrability of cement - limestone filler grout in the granular matrix of self compacting concrete are an important factors that affecting both its rheological and its hardened properties. This experimental and theoretical work consists to study the effect of limestone filler fineness on the rheological behavior of cement - limestone filler grout. In the first part, five different grouts were prepared by varying the Blaine Specific Surface (BSS) of the limestone filler, 3060, 4750, 6320, 7680 and 9440 cm2/g, respectively. A large number of properties relating to the rheology and the stability are carried out on the five grouts such as grain dispersion, density, volume concentration of solid, dynamic viscosity and Marsh funnel flow. The second part consists to develop a theoretical model to predict the different rheological properties of the grout as function of limestone filler BSS. The results show that the rheological properties of cement-limestone filler grout such as the dispersion percentage, the intergranular distance and the flow time are strongly affected by the limestone fillers fineness. In addition, the experimental and the predicted results present a good agreement.

ACS Style

Omrane Benjeddou; Mamdooh Alwetaishi; Morched Tounsi; Rayed Alyousef; Hisham Alabduljabbar. Effects of limestone filler fineness on the rheological behavior of cement – Limestone filler grouts. Ain Shams Engineering Journal 2021, 1 .

AMA Style

Omrane Benjeddou, Mamdooh Alwetaishi, Morched Tounsi, Rayed Alyousef, Hisham Alabduljabbar. Effects of limestone filler fineness on the rheological behavior of cement – Limestone filler grouts. Ain Shams Engineering Journal. 2021; ():1.

Chicago/Turabian Style

Omrane Benjeddou; Mamdooh Alwetaishi; Morched Tounsi; Rayed Alyousef; Hisham Alabduljabbar. 2021. "Effects of limestone filler fineness on the rheological behavior of cement – Limestone filler grouts." Ain Shams Engineering Journal , no. : 1.

Journal article
Published: 29 March 2021 in Crystals
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Cement is among the major contributors to the global carbon dioxide emissions. Thus, sustainable alternatives to the conventional cement are essential for producing greener concrete structures. Rice husk ash has shown promising characteristics to be a sustainable option for further research and investigation. Since the experimental work required for assessing its properties is both time consuming and complex, machine learning can be used to successfully predict the properties of concrete containing rice husk ash. A total of 192 data points are used in this study to assess the compressive strength of rice husk ash blended concrete. Input parameters include age, amount of cement, rice husk ash, super plasticizer, water, and aggregates. Four soft computing and machine learning methods, i.e., artificial neural networks (ANN), adaptive neuro-fuzzy inference system (ANFIS), multiple nonlinear regression (NLR), and linear regression are employed in this research. Sensitivity analysis, parametric analysis, and correlation factor (R2) are used to evaluate the obtained results. The ANN and ANFIS outperformed other methods.

ACS Style

Ammar Iqtidar; Niaz Bahadur Khan; Sardar Kashif-Ur-Rehman; Muhmmad Faisal Javed; Fahid Aslam; Rayed Alyousef; Hisham Alabduljabbar; Amir Mosavi. Prediction of Compressive Strength of Rice Husk Ash Concrete through Different Machine Learning Processes. Crystals 2021, 11, 352 .

AMA Style

Ammar Iqtidar, Niaz Bahadur Khan, Sardar Kashif-Ur-Rehman, Muhmmad Faisal Javed, Fahid Aslam, Rayed Alyousef, Hisham Alabduljabbar, Amir Mosavi. Prediction of Compressive Strength of Rice Husk Ash Concrete through Different Machine Learning Processes. Crystals. 2021; 11 (4):352.

Chicago/Turabian Style

Ammar Iqtidar; Niaz Bahadur Khan; Sardar Kashif-Ur-Rehman; Muhmmad Faisal Javed; Fahid Aslam; Rayed Alyousef; Hisham Alabduljabbar; Amir Mosavi. 2021. "Prediction of Compressive Strength of Rice Husk Ash Concrete through Different Machine Learning Processes." Crystals 11, no. 4: 352.

Article
Published: 06 January 2021 in International Journal of Steel Structures
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This paper presents an experimental and finite element (FE) investigation into the local-overall buckling interaction behaviour of axially loaded cold-formed steel (CFS) channel section columns. Current design guidelines from the American Iron and Steel Institute (AISI) and the Australian and New Zealand Standards (AS/NZS) recommend the use of a non-dimensional strength curve for determining the axial capacity of such CFS channel section columns. This study has reviewed the accuracy of the current AISI (2016), AS/NZS (2018) and Eurocode (EN 1993-1-3) design guidelines for determining the axial capacity of CFS channel sections under local-overall buckling interaction failure. A total of 40 tests were conducted on CFS channel sections covering stub, short, intermediate, and slender columns with varying thicknesses. A nonlinear FE model was then developed and validated against the test results. The validated FE model was used to conduct a parametric study comprising 70 FE models to review the accuracy of the current design guidelines in accordance with AISI (2016), AS/NZS (2018) and Eurocode (EN 1993-1-3). It was found that the AISI (2016) and AS/NZS (2018) are conservative by 10 to 15% on average when determining the axial capacity of pin-ended CFS channel section columns undergoing local-overall buckling interaction. Eurocode (EN 1993-1-3) design rules were found to lead to considerably more conservative predictions of column axial load capacity for CFS channels.This paper has therefore proposed modifications to the current design rules of AISI (2016) and AS/NZS (2018). The accuracy of proposed design rules was verified using the FE analysis and test results of CFS channel section columns undergoing local-overall buckling interaction.

ACS Style

Krishanu Roy; Tina Chui Huon Ting; Hieng Ho Lau; Rehan Masood; Rayed Alyousef; Hisham Alabduljabbar; Abdulaziz Alaskar; Fahed Alrshoudi; James B. P. Lim. Cold-Formed Steel Lipped Channel Section Columns Undergoing Local-Overall Buckling Interaction. International Journal of Steel Structures 2021, 1 -22.

AMA Style

Krishanu Roy, Tina Chui Huon Ting, Hieng Ho Lau, Rehan Masood, Rayed Alyousef, Hisham Alabduljabbar, Abdulaziz Alaskar, Fahed Alrshoudi, James B. P. Lim. Cold-Formed Steel Lipped Channel Section Columns Undergoing Local-Overall Buckling Interaction. International Journal of Steel Structures. 2021; ():1-22.

Chicago/Turabian Style

Krishanu Roy; Tina Chui Huon Ting; Hieng Ho Lau; Rehan Masood; Rayed Alyousef; Hisham Alabduljabbar; Abdulaziz Alaskar; Fahed Alrshoudi; James B. P. Lim. 2021. "Cold-Formed Steel Lipped Channel Section Columns Undergoing Local-Overall Buckling Interaction." International Journal of Steel Structures , no. : 1-22.

Journal article
Published: 02 December 2020 in Materials
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Alkali activated concretes have emerged as a prospective alternative to conventional concrete wherein diverse waste materials have been converted as valuable spin-offs. This paper presents a wide experimental study on the sustainability of employing waste sawdust as a fine/coarse aggregate replacement incorporating fly ash (FA) and granulated blast furnace slag (GBFS) to make high-performance cement-free lightweight concretes. Waste sawdust was replaced with aggregate at 0, 25, 50, 75, and 100 vol% incorporating alkali binder, including 70% FA and 30% GBFS. The blend was activated using a low sodium hydroxide concentration (2 M). The acoustic, thermal, and predicted engineering properties of concretes were evaluated, and the life cycle of various mixtures were calculated to investigate the sustainability of concrete. Besides this, by using the available experimental test database, an optimized Artificial Neural Network (ANN) was developed to estimate the mechanical properties of the designed alkali-activated mortar mixes depending on each sawdust volume percentage. Based on the findings, it was found that the sound absorption and reduction in thermal conductivity were enhanced with increasing sawdust contents. The compressive strengths of the specimens were found to be influenced by the sawdust content and the strength dropped from 65 to 48 MPa with the corresponding increase in the sawdust levels from 0% up to 100%. The results also showed that the emissions of carbon dioxide, energy utilization, and outlay tended to drop with an increase in the amount of sawdust and show more the lightweight concrete to be more sustainable for construction applications.

ACS Style

Hisham Alabduljabbar; Ghasan Huseien; Abdul Sam; Rayed Alyouef; Hassan Algaifi; Abdulaziz Alaskar. Engineering Properties of Waste Sawdust-Based Lightweight Alkali-Activated Concrete: Experimental Assessment and Numerical Prediction. Materials 2020, 13, 5490 .

AMA Style

Hisham Alabduljabbar, Ghasan Huseien, Abdul Sam, Rayed Alyouef, Hassan Algaifi, Abdulaziz Alaskar. Engineering Properties of Waste Sawdust-Based Lightweight Alkali-Activated Concrete: Experimental Assessment and Numerical Prediction. Materials. 2020; 13 (23):5490.

Chicago/Turabian Style

Hisham Alabduljabbar; Ghasan Huseien; Abdul Sam; Rayed Alyouef; Hassan Algaifi; Abdulaziz Alaskar. 2020. "Engineering Properties of Waste Sawdust-Based Lightweight Alkali-Activated Concrete: Experimental Assessment and Numerical Prediction." Materials 13, no. 23: 5490.

Journal article
Published: 09 November 2020 in Crystals
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The present research investigated the bond behavior of a cleaned corroded reinforcing bar repaired with a partial depth concrete repair and a partial depth concrete repair followed by the application of fiber-reinforced polymer (FRP) sheets. Twelve lap splice beams were cast and tested under static loading. The test variables considered were a partial depth repair with prepackaged self-consolidating concrete (SCC) for six lap splice beams and additional confinement with carbon fiber reinforced polymer (CFRP) sheets for another six beams. The test results for the repaired lap splice beams were compared with those for a monolithic lap splice beam. This research found that the average bond strength increased as the bar mass loss increased for all bonded lengths. The lap splice beams repaired with partial depth were able to repair concrete with similar properties to those of the monolithic concrete. However, they had higher concrete strength than the monolithic beams which showed a higher average bond strength than the monolithic lap splice beams. The beams confined with FRP sheets showed a rise in the bond strength and the equivalent slip by 34–49%, and 56–260% as compared to the unconfined beams, respectively.

ACS Style

Hisham Alabduljabbar; Rayed Alyousef; Hossein Mohammadhosseini; Tim Topper. Bond Behavior of Cleaned Corroded Lap Spliced Beams Repaired with Carbon Fiber Reinforced Polymer Sheets and Partial Depth Repairs. Crystals 2020, 10, 1014 .

AMA Style

Hisham Alabduljabbar, Rayed Alyousef, Hossein Mohammadhosseini, Tim Topper. Bond Behavior of Cleaned Corroded Lap Spliced Beams Repaired with Carbon Fiber Reinforced Polymer Sheets and Partial Depth Repairs. Crystals. 2020; 10 (11):1014.

Chicago/Turabian Style

Hisham Alabduljabbar; Rayed Alyousef; Hossein Mohammadhosseini; Tim Topper. 2020. "Bond Behavior of Cleaned Corroded Lap Spliced Beams Repaired with Carbon Fiber Reinforced Polymer Sheets and Partial Depth Repairs." Crystals 10, no. 11: 1014.

Review
Published: 28 September 2020 in Materials
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Foamed concrete (FC) is a high-quality building material with densities from 300 to 1850 kg/m3, which can have potential use in civil engineering, both as insulation from heat and sound, and for load-bearing structures. However, due to the nature of the cement material and its high porosity, FC is very weak in withstanding tensile loads; therefore, it often cracks in a plastic state, during shrinkage while drying, and also in a solid state. This paper is the first comprehensive review of the use of man-made and natural fibres to produce fibre-reinforced foamed concrete (FRFC). For this purpose, various foaming agents, fibres and other components that can serve as a basis for FRFC are reviewed and discussed in detail. Several factors have been found to affect the mechanical properties of FRFC, namely: fresh and hardened densities, particle size distribution, percentage of pozzolanic material used and volume of chemical foam agent. It was found that the rheological properties of the FRFC mix are influenced by the properties of both fibres and foam; therefore, it is necessary to apply an additional dosage of a foam agent to enhance the adhesion and cohesion between the foam agent and the cementitious filler in comparison with materials without fibres. Various types of fibres allow the reduction of by autogenous shrinkage a factor of 1.2–1.8 and drying shrinkage by a factor of 1.3–1.8. Incorporation of fibres leads to only a slight increase in the compressive strength of foamed concrete; however, it can significantly improve the flexural strength (up to 4 times), tensile strength (up to 3 times) and impact strength (up to 6 times). At the same time, the addition of fibres leads to practically no change in the heat and sound insulation characteristics of foamed concrete and this is basically depended on the type of fibres used such as Nylon and aramid fibres. Thus, FRFC having the presented set of properties has applications in various areas of construction, both in the construction of load-bearing and enclosing structures.

ACS Style

Mugahed Amran; Roman Fediuk; Nikolai Vatin; Yeong Huei Lee; Gunasekaran Murali; Togay Ozbakkaloglu; Sergey Klyuev; Hisham Alabduljabber. Fibre-Reinforced Foamed Concretes: A Review. Materials 2020, 13, 4323 .

AMA Style

Mugahed Amran, Roman Fediuk, Nikolai Vatin, Yeong Huei Lee, Gunasekaran Murali, Togay Ozbakkaloglu, Sergey Klyuev, Hisham Alabduljabber. Fibre-Reinforced Foamed Concretes: A Review. Materials. 2020; 13 (19):4323.

Chicago/Turabian Style

Mugahed Amran; Roman Fediuk; Nikolai Vatin; Yeong Huei Lee; Gunasekaran Murali; Togay Ozbakkaloglu; Sergey Klyuev; Hisham Alabduljabber. 2020. "Fibre-Reinforced Foamed Concretes: A Review." Materials 13, no. 19: 4323.

Research article
Published: 26 September 2020 in Advances in Civil Engineering
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The experimental design of high-strength concrete (HSC) requires deep analysis to get the target strength. In this study, machine learning approaches and artificial intelligence python-based approaches have been utilized to predict the mechanical behaviour of HSC. The data to be used in the modelling consist of several input parameters such as cement, water, fine aggregate, and coarse aggregate in combination with a superplasticizer. Empirical relation with mathematical expression has been proposed using engineering programming. The efficiency of the models is assessed by statistical analysis with the error by using MAE, RRMSE, RSE, and comparisons were made between regression models. Moreover, variable intensity and correlation have shown that deep learning can be used to know the exact amount of materials in civil engineering rather than doing experimental work. The expression tree, as well as normalization of the graph, depicts significant accuracy between target and output values. The results reveal that machine learning proposed adamant accuracy and has elucidated performance in the prediction aspect.

ACS Style

Fahid Aslam; Furqan Farooq; Muhammad Nasir Amin; Kaffayatullah Khan; Abdul Waheed; Arslan Akbar; Muhammad Faisal Javed; Rayed Alyousef; Hisham Alabdulijabbar. Applications of Gene Expression Programming for Estimating Compressive Strength of High-Strength Concrete. Advances in Civil Engineering 2020, 2020, 1 -23.

AMA Style

Fahid Aslam, Furqan Farooq, Muhammad Nasir Amin, Kaffayatullah Khan, Abdul Waheed, Arslan Akbar, Muhammad Faisal Javed, Rayed Alyousef, Hisham Alabdulijabbar. Applications of Gene Expression Programming for Estimating Compressive Strength of High-Strength Concrete. Advances in Civil Engineering. 2020; 2020 ():1-23.

Chicago/Turabian Style

Fahid Aslam; Furqan Farooq; Muhammad Nasir Amin; Kaffayatullah Khan; Abdul Waheed; Arslan Akbar; Muhammad Faisal Javed; Rayed Alyousef; Hisham Alabdulijabbar. 2020. "Applications of Gene Expression Programming for Estimating Compressive Strength of High-Strength Concrete." Advances in Civil Engineering 2020, no. : 1-23.

Journal article
Published: 22 September 2020 in Materials
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This research aims to explore the effects of nanoparticles such as alumina (Al2O3) on the physical and mechanical properties of medium density fiberboards (MDF). The nanoparticles are added in urea-formaldehyde (UF) resin with different concentration levels e.g., 1.5%, 3%, and 4.5% by weight. A combination of forest fibers such as Populus Deltuidess (Poplar) and Euamericana (Ghaz) are used as a composite reinforcement due to their exceptional abrasion confrontation as well as their affordability and economic value with Al2O3-UF as a matrix or nanofillers for making the desired nanocomposite specimens. Thermo-gravimetric analysis (TGA) and thermal analytical analysis (TAA) in the form of differential scanning calorimetry (DSC) are carried out and it has been found that increasing the percentage of alumina nanoparticles leads to an increase in the total heat content. The mechanical properties such as internal bonding (IB), modulus of elasticity (MOE) and modulus of rupture (MOR), and physical properties such as density, water absorption (WA), and thickness swelling (TS) of the specimens have been investigated. The experimental results showed that properties of the new Nano-MDF are higher when compared to the normal samples. The results also showed that increasing the concentration of alumina nanoparticles in the urea-formaldehyde resin effects the mechanical properties of panels considerably.

ACS Style

Hisham Alabduljabbar; Rayed Alyousef; Waheed Gul; Syed Riaz Akbar Shah; Afzal Khan; Razaullah Khan; Abdulaziz Alaskar. Effect of Alumina Nano-Particles on Physical and Mechanical Properties of Medium Density Fiberboard. Materials 2020, 13, 4207 .

AMA Style

Hisham Alabduljabbar, Rayed Alyousef, Waheed Gul, Syed Riaz Akbar Shah, Afzal Khan, Razaullah Khan, Abdulaziz Alaskar. Effect of Alumina Nano-Particles on Physical and Mechanical Properties of Medium Density Fiberboard. Materials. 2020; 13 (18):4207.

Chicago/Turabian Style

Hisham Alabduljabbar; Rayed Alyousef; Waheed Gul; Syed Riaz Akbar Shah; Afzal Khan; Razaullah Khan; Abdulaziz Alaskar. 2020. "Effect of Alumina Nano-Particles on Physical and Mechanical Properties of Medium Density Fiberboard." Materials 13, no. 18: 4207.

Erratum
Published: 09 September 2020 in Results in Engineering
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Y.H. Mugahed Amran; Rayed Alyousef; Mohamed El-Zeadani; Hisham Alabduljabbar. Corrigendum to “Performance investigation of high-proportion Saudi-fly-ash-based concrete” [Results Eng. 6 (2020) 100118]. Results in Engineering 2020, 8, 100170 .

AMA Style

Y.H. Mugahed Amran, Rayed Alyousef, Mohamed El-Zeadani, Hisham Alabduljabbar. Corrigendum to “Performance investigation of high-proportion Saudi-fly-ash-based concrete” [Results Eng. 6 (2020) 100118]. Results in Engineering. 2020; 8 ():100170.

Chicago/Turabian Style

Y.H. Mugahed Amran; Rayed Alyousef; Mohamed El-Zeadani; Hisham Alabduljabbar. 2020. "Corrigendum to “Performance investigation of high-proportion Saudi-fly-ash-based concrete” [Results Eng. 6 (2020) 100118]." Results in Engineering 8, no. : 100170.

Journal article
Published: 06 September 2020 in Crystals
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Pre-packed aggregate fibre-reinforced concrete (PAFRC) is an innovative type of concrete composite using a mixture of coarse aggregates and fibres which are pre-mixed and pre-placed in the formwork. A flowable grout is then injected into the cavities between the aggregate mass. This study develops the concept of a new PAFRC, which is reinforced with polypropylene (PP) waste carpet fibres, investigating its mechanical properties and impact resistance under drop weight impact load. Palm oil fuel ash (POFA) is used as a partial cement replacement, with a replacement level of 20%. The compressive strength, impact resistance, energy absorption, long-term drying shrinkage, and microstructural analysis of PAFRC are explored. Two methods of grout injection are used—namely, gravity and pumping methods. For each method, six PAFRC batches containing 0–1.25% fibres (with a length of 30 mm) were cast. The findings of the study reveal that, by adding waste PP fibre, the compressive strength of PAFRC specimens decreased. However, with longer curing periods, the compressive strength enhanced due to the pozzolanic activity of POFA. The combination of fibres and POFA in PAFRC mixtures leads to the higher impact strength energy absorption and improved ductility of the concrete. Furthermore, drying shrinkage was reduced by about 28.6% for the pumping method PAFRC mix containing 0.75% fibres. Due to the unique production method of PAFRC and high impact resistance and energy absorption, it can be used in many pioneering applications.

ACS Style

Fahed Alrshoudi; Hossein Mohammadhosseini; Rayed Alyousef; Mahmood Md. Tahir; Hisham Alabduljabbar; Abdeliazim Mustafa Mohamed. The Impact Resistance and Deformation Performance of Novel Pre-Packed Aggregate Concrete Reinforced with Waste Polypropylene Fibres. Crystals 2020, 10, 788 .

AMA Style

Fahed Alrshoudi, Hossein Mohammadhosseini, Rayed Alyousef, Mahmood Md. Tahir, Hisham Alabduljabbar, Abdeliazim Mustafa Mohamed. The Impact Resistance and Deformation Performance of Novel Pre-Packed Aggregate Concrete Reinforced with Waste Polypropylene Fibres. Crystals. 2020; 10 (9):788.

Chicago/Turabian Style

Fahed Alrshoudi; Hossein Mohammadhosseini; Rayed Alyousef; Mahmood Md. Tahir; Hisham Alabduljabbar; Abdeliazim Mustafa Mohamed. 2020. "The Impact Resistance and Deformation Performance of Novel Pre-Packed Aggregate Concrete Reinforced with Waste Polypropylene Fibres." Crystals 10, no. 9: 788.

Journal article
Published: 24 August 2020 in Materials
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This study examines the effect of elevated temperature on various properties of reactive powder concrete (RPC) containing varying percentages of recycled fine aggregates as sand replacement. Recycled fine aggregates were collected from two sources, i.e., demolished normal strength concrete and demolished RPC. The specimens were prepared using 25%, 50%, and 75% replacement of natural sand with recycled fine aggregates, exposed to two different curing conditions and were subjected to four temperatures, i.e., 25, 200, 400, and 600 °C. Later, the specimens were tested for mass loss, compressive strength test, split-tensile strength test, flexural strength test, and water absorption test at all temperature ranges. Results determined that although the mechanical properties degraded with the temperature rise, the recycled aggregates can be employed as a partial replacement of natural sand in RPC without causing a significant decrease in the performance of RPC, and can help to produce more sustainable RPC by using recycled aggregates.

ACS Style

Hammad Salahuddin; Liaqat Ali Qureshi; Adnan Nawaz; Muhammad Abid; Rayed Alyousef; Hisham Alabduljabbar; Fahid Aslam; Summera Fahmi Khan; Rana Faisal Tufail. Elevated Temperature Performance of Reactive Powder Concrete Containing Recycled Fine Aggregates. Materials 2020, 13, 3748 .

AMA Style

Hammad Salahuddin, Liaqat Ali Qureshi, Adnan Nawaz, Muhammad Abid, Rayed Alyousef, Hisham Alabduljabbar, Fahid Aslam, Summera Fahmi Khan, Rana Faisal Tufail. Elevated Temperature Performance of Reactive Powder Concrete Containing Recycled Fine Aggregates. Materials. 2020; 13 (17):3748.

Chicago/Turabian Style

Hammad Salahuddin; Liaqat Ali Qureshi; Adnan Nawaz; Muhammad Abid; Rayed Alyousef; Hisham Alabduljabbar; Fahid Aslam; Summera Fahmi Khan; Rana Faisal Tufail. 2020. "Elevated Temperature Performance of Reactive Powder Concrete Containing Recycled Fine Aggregates." Materials 13, no. 17: 3748.

Journal article
Published: 22 August 2020 in Crystals
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The complication linked with the prediction of the ultimate capacity of concrete-filled steel tubes (CFST) short circular columns reveals a need for conducting an in-depth structural behavioral analyses of this member subjected to axial-load only. The distinguishing feature of gene expression programming (GEP) has been utilized for establishing a prediction model for the axial behavior of long CFST. The proposed equation correlates the ultimate axial capacity of long circular CFST with depth, thickness, yield strength of steel, the compressive strength of concrete and the length of the CFST, without need for conducting any expensive and laborious experiments. A comprehensive CFST short circular column under an axial load was obtained from extensive literature to build the proposed models, and subsequently implemented for verification purposes. This model consists of extensive database literature and is comprised of 227 data samples. External validations were carried out using several statistical criteria recommended by researchers. The developed GEP model demonstrated superior performance to the available design methods for AS5100.6, EC4, AISC, BS, DBJ and AIJ design codes. The proposed design equations can be reliably used for pre-design purposes—or may be used as a fast check for deterministic solutions.

ACS Style

Muhammad Faisal Javed; Furqan Farooq; Shazim Ali Memon; Arslan Akbar; Mohsin Ali Khan; Fahid Aslam; Rayed Alyousef; Hisham Alabduljabbar; Sardar Kashif Ur Rehman. New Prediction Model for the Ultimate Axial Capacity of Concrete-Filled Steel Tubes: An Evolutionary Approach. Crystals 2020, 10, 741 .

AMA Style

Muhammad Faisal Javed, Furqan Farooq, Shazim Ali Memon, Arslan Akbar, Mohsin Ali Khan, Fahid Aslam, Rayed Alyousef, Hisham Alabduljabbar, Sardar Kashif Ur Rehman. New Prediction Model for the Ultimate Axial Capacity of Concrete-Filled Steel Tubes: An Evolutionary Approach. Crystals. 2020; 10 (9):741.

Chicago/Turabian Style

Muhammad Faisal Javed; Furqan Farooq; Shazim Ali Memon; Arslan Akbar; Mohsin Ali Khan; Fahid Aslam; Rayed Alyousef; Hisham Alabduljabbar; Sardar Kashif Ur Rehman. 2020. "New Prediction Model for the Ultimate Axial Capacity of Concrete-Filled Steel Tubes: An Evolutionary Approach." Crystals 10, no. 9: 741.

Journal article
Published: 21 August 2020 in Crystals
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Compressive strength is one of the important property of concrete and depends on many factors. Most of the concrete compressive strength predictive models mainly rely on available literature data, which are too simple to consider all the contributing factors. This study adopted a new approach to predict the compressive strength of sugarcane bagasse ash concrete (SCBAC). A vast amount of data from the literature study and fifteen laboratory tested concrete samples with different dosage of bagasse ash, were respectively used to calibrate and validate the models. The novel Gene Expression Programming, Multiple Linear Regression and Multiple Non-Linear Regression were used to model SCBAC compressive strength. The water cement ratio, bagasse ash percent replacement, quantity of fine and coarse aggregate and cement content were used as an input for models development. Various statistical indicators, i.e., NSE, R2 and RMSE were used to assess the performance of the models. The results indicated a strong correlation between observed and predicted values with NSE and R2 both above 0.8 during calibration and validation for the Gene Expression Programming (GEP). The outcomes from GEP outclassed all the models to predict SCBAC compressive strength. The validity of the model is further verified using data of fifteen tests conducted in the laboratory. Moreover, the cement content in the mix was revealed as the most sensitive parameter followed by water cement ratio form sensitivity analysis. The GEP fulfilled all the criteria for external validity. The simple formulae derived in this study could be used reliably for the prediction of SCBAC compressive strength.

ACS Style

Muhammad Faisal Javed; Muhammad Nasir Amin; Muhammad Izhar Shah; Kaffayatullah Khan; Bawar Iftikhar; Furqan Farooq; Fahid Aslam; Rayed Alyousef; Hisham Alabduljabbar. Applications of Gene Expression Programming and Regression Techniques for Estimating Compressive Strength of Bagasse Ash based Concrete. Crystals 2020, 10, 737 .

AMA Style

Muhammad Faisal Javed, Muhammad Nasir Amin, Muhammad Izhar Shah, Kaffayatullah Khan, Bawar Iftikhar, Furqan Farooq, Fahid Aslam, Rayed Alyousef, Hisham Alabduljabbar. Applications of Gene Expression Programming and Regression Techniques for Estimating Compressive Strength of Bagasse Ash based Concrete. Crystals. 2020; 10 (9):737.

Chicago/Turabian Style

Muhammad Faisal Javed; Muhammad Nasir Amin; Muhammad Izhar Shah; Kaffayatullah Khan; Bawar Iftikhar; Furqan Farooq; Fahid Aslam; Rayed Alyousef; Hisham Alabduljabbar. 2020. "Applications of Gene Expression Programming and Regression Techniques for Estimating Compressive Strength of Bagasse Ash based Concrete." Crystals 10, no. 9: 737.