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Fahad Ul Rehman Abro
Civil Engineering Department, Mehran University of Engineering and Technology, Jamshoro 76090, Pakistan

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Journal article
Published: 24 August 2021 in Sustainability
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Concrete is a popular building material all over the world, but because of different physiochemical processes, it is susceptible to crack development. One of the primary deterioration processes of reinforced concrete buildings is corrosion of steel bars within the concrete through these cracks. In this regard, a self-healing technique for crack repair would be the best solution to reduce the penetration of chloride ions inside concrete mass. In this study, a rapid chloride migration (RCM) test was conducted to determine the self-healing capacity of cracked mortar. With the help of the RCM test, the steady-state migration coefficient of cracked and uncracked specimens incorporating expansive and crystalline admixtures was calculated. Based on the rate of change of the chloride ion concentrations in the steady-state condition, the migration coefficient was calculated. Furthermore, bulk electrical conductivity tests were also conducted before and after the migration test to understand the self-healing behavior. It was evident from the test results that the self-healing of cracks was helpful to reduce the penetration of chloride ions and that it enhanced the ability of cracked mortar to restrict the chloride ingress. Using this test method, the self-healing capacity of the new self-healing technologies can be evaluated. The RCM test can be an acceptable technique to assess the self-healing ability of cement-based materials in a very short period, and the self-healing capacity can be characterized in terms of the decrease of chloride migration coefficients.

ACS Style

Fahad Ul Rehman Abro; Abdul Salam Buller; Tariq Ali; Zain Ul-Abdin; Zaheer Ahmed; Noor Ahmed Memon; Ali Raza Lashari. Autogenous Healing of Cracked Mortar Using Modified Steady-State Migration Test against Chloride Penetration. Sustainability 2021, 13, 9519 .

AMA Style

Fahad Ul Rehman Abro, Abdul Salam Buller, Tariq Ali, Zain Ul-Abdin, Zaheer Ahmed, Noor Ahmed Memon, Ali Raza Lashari. Autogenous Healing of Cracked Mortar Using Modified Steady-State Migration Test against Chloride Penetration. Sustainability. 2021; 13 (17):9519.

Chicago/Turabian Style

Fahad Ul Rehman Abro; Abdul Salam Buller; Tariq Ali; Zain Ul-Abdin; Zaheer Ahmed; Noor Ahmed Memon; Ali Raza Lashari. 2021. "Autogenous Healing of Cracked Mortar Using Modified Steady-State Migration Test against Chloride Penetration." Sustainability 13, no. 17: 9519.

Journal article
Published: 09 October 2019 in Engineering, Technology & Applied Science Research
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This study aims to investigate the effect of different gradations of coarse aggregates on mechanical properties of no-fines concrete (NFC). NFC reduces a structure’s self-weight, thus minimizing cost. The effects of coarse aggregate gradation on mechanical properties such as compressive strength, split tensile strength, and flexural strength were studied and compared at the end of 28-day water curing. A fixed cement- to-aggregate proportion 1:6 with 0.5 water/cement (w/c) ratio was adopted. Four gradations of coarse aggregates ranging between specific maximum and minimum size were used, namely 5mm-4mm, 10mm-4mm, 20mm-4mm and 20mm-15mm. The results of this study reveal the substantial effect of the gradation of coarse aggregates on strength properties compressive and tensile strength of NFC.

ACS Style

Abdul Buller; Z. A. Tunio; Fahad Ul Rehman Abro; T. Ali; K. A. Jamali. Influence of Coarse Aggregate Gradation on the Mechnical Properties of Concrete, Part II: No-Fines Vs. Ordinary Concrete. Engineering, Technology & Applied Science Research 2019, 9, 4623 -4626.

AMA Style

Abdul Buller, Z. A. Tunio, Fahad Ul Rehman Abro, T. Ali, K. A. Jamali. Influence of Coarse Aggregate Gradation on the Mechnical Properties of Concrete, Part II: No-Fines Vs. Ordinary Concrete. Engineering, Technology & Applied Science Research. 2019; 9 (5):4623-4626.

Chicago/Turabian Style

Abdul Buller; Z. A. Tunio; Fahad Ul Rehman Abro; T. Ali; K. A. Jamali. 2019. "Influence of Coarse Aggregate Gradation on the Mechnical Properties of Concrete, Part II: No-Fines Vs. Ordinary Concrete." Engineering, Technology & Applied Science Research 9, no. 5: 4623-4626.

Research article
Published: 22 September 2019 in Advances in Materials Science and Engineering
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This research is sought to characterize the stimulated autogenous healing of fiber-reinforced mortars that incorporate healing agents such as crystalline admixtures, expansive agents, and geomaterials. The effects of the healing materials on mechanical performance and water permeability were evaluated experimentally. Furthermore, microscopic and microstructural observations were conducted to investigate the characteristics and physical appearance of healing products within healed cracks. Test results are presented herein regarding index of strength recovery (ISR), index of damage recovery (IDR) and index of dissipation energy gain (IDEG) in relation to crack healing, and reduction of water flow rate. The self-healing capability of the mortars was greater in terms of resisting water flow rather than recovering mechanical performance likely because water flow depends on surface crack sealing, whereas mechanical performance depends on bonding capacity as well as full-depth healing of cracks; thus, mechanical performance may further be improved after longer healing duration.

ACS Style

Abdul Salam Buller; Fahad Ul Rehman Abro; Kwang-Myong Lee; Seung Yup Jang. Mechanical Recovery of Cracked Fiber-Reinforced Mortar Incorporating Crystalline Admixture, Expansive Agent, and Geomaterial. Advances in Materials Science and Engineering 2019, 2019, 1 -14.

AMA Style

Abdul Salam Buller, Fahad Ul Rehman Abro, Kwang-Myong Lee, Seung Yup Jang. Mechanical Recovery of Cracked Fiber-Reinforced Mortar Incorporating Crystalline Admixture, Expansive Agent, and Geomaterial. Advances in Materials Science and Engineering. 2019; 2019 ():1-14.

Chicago/Turabian Style

Abdul Salam Buller; Fahad Ul Rehman Abro; Kwang-Myong Lee; Seung Yup Jang. 2019. "Mechanical Recovery of Cracked Fiber-Reinforced Mortar Incorporating Crystalline Admixture, Expansive Agent, and Geomaterial." Advances in Materials Science and Engineering 2019, no. : 1-14.

Journal article
Published: 09 June 2019 in Materials
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Interest in self-healing-crack technologies for cement-based materials has been growing, but research into such materials remains in the early stage of development and standardized methods for evaluating healing capacity have not yet been established. Therefore, this study proposes a test method to evaluate the self-healing capacity of cement-based materials in terms of their resistance to chloride penetration. For this purpose, the steady-state chloride migration test has been used to measure the diffusion coefficients of cracked mortar specimens containing crystalline, expansive, and swelling admixtures. The results of the present study show that the time to reach a quasi-steady-state decreased and the diffusion coefficients increased as the potential increased because of the potential drop inside the migration cell and self-healing that occurred during the test. Therefore, use of a high potential is recommended to minimize the test duration, as long as the temperature does not rise too much during the test. Using this test method, the self-healing capacity of the new self-healing technologies can be evaluated, and an index of self-healing capacity is proposed based on the rate of charged chloride ions passing through a crack.

ACS Style

Fahad Ul Rehman Abro; Abdul Salam Buller; Kwang-Myong Lee; Seung Yup Jang. Using the Steady-State Chloride Migration Test to Evaluate the Self-Healing Capacity of Cracked Mortars Containing Crystalline, Expansive, and Swelling Admixtures. Materials 2019, 12, 1865 .

AMA Style

Fahad Ul Rehman Abro, Abdul Salam Buller, Kwang-Myong Lee, Seung Yup Jang. Using the Steady-State Chloride Migration Test to Evaluate the Self-Healing Capacity of Cracked Mortars Containing Crystalline, Expansive, and Swelling Admixtures. Materials. 2019; 12 (11):1865.

Chicago/Turabian Style

Fahad Ul Rehman Abro; Abdul Salam Buller; Kwang-Myong Lee; Seung Yup Jang. 2019. "Using the Steady-State Chloride Migration Test to Evaluate the Self-Healing Capacity of Cracked Mortars Containing Crystalline, Expansive, and Swelling Admixtures." Materials 12, no. 11: 1865.

Journal article
Published: 21 May 2019 in Civil Engineering Journal
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This paper is aimed to evaluate the effect of mould size on compressive strength of concrete cubes made with recyclable concrete aggregates. Natural coarse aggregates were replaced with 50% recycled aggregates from old demolished concrete. Five different mould sizes were used to cast 420 concrete cubes using 1:2:4 mix and 0.55 water/cement ratio. In each size equal number of cubes was cured for 3, 7, 14 and 28-day. After curing, weight of cubes was determined followed by testing for compressive strength in universal load testing machine with gradually increasing load. From the obtained results the strength correction coefficients were computed keeping 28-day cured standard size cubes as control specimens. Also, numerical expression based on regression analysis was developed to predict the compressive strength using weight of cube, area of mould and curing age as input parameter. The numerical equation predicts the compressive strength very well with maximum of 10.86% error with respect to experimental results.

ACS Style

Bashir Ahmed Memon; Mahboob Oad; Abdul Hafeez Buller; Sajjad Ahmed Shar; Abdul Salam Buller; Fahad Ul Rehman Abro. Effect of Mould Size on Compressive Strength of Green Concrete Cubes. Civil Engineering Journal 2019, 5, 1181 -1188.

AMA Style

Bashir Ahmed Memon, Mahboob Oad, Abdul Hafeez Buller, Sajjad Ahmed Shar, Abdul Salam Buller, Fahad Ul Rehman Abro. Effect of Mould Size on Compressive Strength of Green Concrete Cubes. Civil Engineering Journal. 2019; 5 (5):1181-1188.

Chicago/Turabian Style

Bashir Ahmed Memon; Mahboob Oad; Abdul Hafeez Buller; Sajjad Ahmed Shar; Abdul Salam Buller; Fahad Ul Rehman Abro. 2019. "Effect of Mould Size on Compressive Strength of Green Concrete Cubes." Civil Engineering Journal 5, no. 5: 1181-1188.

Journal article
Published: 01 July 2014 in International Journal of Engineering Research
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ACS Style

Noor Ahmed Memon; Fahad Ul Rehman Abro; Ubaidullah Memon; Salihuddin Radin Sumadi. Effect of the Curing Conditions and Superplasticizer on Compressive Strength of Concrete Exposed To High Ambient Temperature of Nawabshah, Pakistan. International Journal of Engineering Research 2014, 3, 462 -464.

AMA Style

Noor Ahmed Memon, Fahad Ul Rehman Abro, Ubaidullah Memon, Salihuddin Radin Sumadi. Effect of the Curing Conditions and Superplasticizer on Compressive Strength of Concrete Exposed To High Ambient Temperature of Nawabshah, Pakistan. International Journal of Engineering Research. 2014; 3 (7):462-464.

Chicago/Turabian Style

Noor Ahmed Memon; Fahad Ul Rehman Abro; Ubaidullah Memon; Salihuddin Radin Sumadi. 2014. "Effect of the Curing Conditions and Superplasticizer on Compressive Strength of Concrete Exposed To High Ambient Temperature of Nawabshah, Pakistan." International Journal of Engineering Research 3, no. 7: 462-464.