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In the article, unique formulations of biodegradable, non-toxic, edible oil-based release oils were developed and tested on architectural concrete. The produced agents have physicochemical properties similar to diesel fuel, but at the same time, are renewable and biodegradable products. An ultrasound was used to properly combine the liquid phase of edible oil and the liquid phase of glyceryl trioleate and/or water. Based on the PN-B-19305 standard, seven-component configurations were designed and then tested. The wettability of the concrete was determined by contact angle (CA) analysis. After the application of the formulations produced, the architectural concrete still had good wettability. The vapor permeability test showed that the tested release agents did not inhibit water vapor diffusion from the tested samples. The O65G35 (65% unique edible oil formula and 35% glyceryl trioleate) concrete had the best absorption. In this case, the CA was 56° after oil application and 46° before. The new agents did not impair the adhesion of the plaster to concrete. The O90W10 concrete showed the best adhesion of plasters made with it—51.9 kN/m2. The study also showed that the concrete surface had excellent paint absorption despite the use of release agents. The architectural concrete was evenly covered with paint without any problem. There were no difficulties in applying it, e.g., greasy places preventing the concrete from being coated with emulsion. The suitability of the produced release oils for lightweight architectural concrete structures intended for facades was confirmed. The best results were obtained after using formulations O65T35 and O90W10.
Danuta Barnat-Hunek; Małgorzata Szafraniec. Influence of Biodegradable Release Oils on the Physical and Mechanical Properties of Light-Colored Architectural Concrete. Materials 2021, 14, 4630 .
AMA StyleDanuta Barnat-Hunek, Małgorzata Szafraniec. Influence of Biodegradable Release Oils on the Physical and Mechanical Properties of Light-Colored Architectural Concrete. Materials. 2021; 14 (16):4630.
Chicago/Turabian StyleDanuta Barnat-Hunek; Małgorzata Szafraniec. 2021. "Influence of Biodegradable Release Oils on the Physical and Mechanical Properties of Light-Colored Architectural Concrete." Materials 14, no. 16: 4630.
The aim of the study was to determine a set of image texture features of the lightweight cementitious composites (LLC) with hydrophobic coatings modified with nanocellulose and use them to assess the materials' durability. A novel method based on a combination of image texture analysis and machine learning methods was proposed. Textural features were extracted from the images obtained with a scanning microscope. The best classification model was built by the Support Vector Machine method using 16 features selected by the Sequential Forward Selection algorithm. The model recognizes one of the four ranges of the contact angle, which is closely related to the degree of resistance of the analyzed material, with an accuracy of 82%. The results obtained show a relationship between the effectiveness of hydrophobic coatings in LCC and images of their surfaces. This relationship can be used with machine learning methods for conducting strength diagnostics of building materials.
Danuta Barnat-Hunek; Zbigniew Omiotek; Małgorzata Szafraniec; Róża Dzierżak. An integrated texture analysis and machine learning approach for durability assessment of lightweight cement composites with hydrophobic coatings modified by nanocellulose. Measurement 2021, 179, 109538 .
AMA StyleDanuta Barnat-Hunek, Zbigniew Omiotek, Małgorzata Szafraniec, Róża Dzierżak. An integrated texture analysis and machine learning approach for durability assessment of lightweight cement composites with hydrophobic coatings modified by nanocellulose. Measurement. 2021; 179 ():109538.
Chicago/Turabian StyleDanuta Barnat-Hunek; Zbigniew Omiotek; Małgorzata Szafraniec; Róża Dzierżak. 2021. "An integrated texture analysis and machine learning approach for durability assessment of lightweight cement composites with hydrophobic coatings modified by nanocellulose." Measurement 179, no. : 109538.
The paper presents the experimental studies on the effect of the water containing micro-nano bubbles of various gases on the physico-mechanical properties of lime-cement mortars. In total, 7 types of mortars were prepared: with water containing the micro-nano bubbles of O2, O3 or CO2 as 50% or 100% substitute of ordinary mixing water (tap water) and the reference mortar prepared using tap water. In order to determine the influence of water with micro-nano bubbles of gases, the consistency of fresh mortar and the physical properties of hardened mortar, i.e., specific and apparent density, total porosity, water absorption by weight and capillary absorption, were established. The mechanical strength of the considered mortars was studied as well by conducting the tests for flexural and compressive strengths following 14, 28 and 56 days. Reduced workability and capillary absorption were observed in the modified mortars within the range of 0.9–8.5%. The mortars indicated an increase in the flexural strength after 28 days ranging from 3.4% to 23.5% and improved compressive strength in 1.2–31%, in comparison to the reference mortar. The conducted studies indicated increased flexural and compressive strengths along with the share of micro-nano bubbles of gases in the mixing water.
Małgorzata Grzegorczyk-Frańczak; Danuta Barnat-Hunek; Wojciech Andrzejuk; Jacek Zaburko; Monika Zalewska; Grzegorz Łagód. Physical Properties and Durability of Lime-Cement Mortars Prepared with Water Containing Micro-Nano Bubbles of Various Gases. Materials 2021, 14, 1902 .
AMA StyleMałgorzata Grzegorczyk-Frańczak, Danuta Barnat-Hunek, Wojciech Andrzejuk, Jacek Zaburko, Monika Zalewska, Grzegorz Łagód. Physical Properties and Durability of Lime-Cement Mortars Prepared with Water Containing Micro-Nano Bubbles of Various Gases. Materials. 2021; 14 (8):1902.
Chicago/Turabian StyleMałgorzata Grzegorczyk-Frańczak; Danuta Barnat-Hunek; Wojciech Andrzejuk; Jacek Zaburko; Monika Zalewska; Grzegorz Łagód. 2021. "Physical Properties and Durability of Lime-Cement Mortars Prepared with Water Containing Micro-Nano Bubbles of Various Gases." Materials 14, no. 8: 1902.
The effect of the use of boiler slag (BS) and fly ash (FA) admixtures in cement-lime renders for an application in repair of salty masonry was investigated. For masonry walls with high degree of salinity, renders with incorporated BS were designed. For structures of a low degree of salinity, external renders were prepared without BS. The mix of perlite and silica sand was used as fine aggregate. In all prepared materials, methyl cellulose was added. In chosen mortars, ethylene vinyl acetate copolymer was inmixed to improve functional and performance characteristic of final products. For the developed renders, comprehensive tests of fresh and hardened mortars properties were conducted, including the measurement of adhesion, water contact angle, mercury pore size distribution, thermal properties, frost and chemical resistance. The microstructure and morphology of the developed mortars was observed using scanning electron microscope SEM. The hardened products were analyzed also by Fourier transform infrared (FT-IR) spectroscopy. The designed renovation renders have satisfied the criteria of WTA 4–9-02 directive. The renders yielded compressive strength from 5.1 to 6.9 MPa. Frost resistance was greatly improved by the 20% replacement of Portland cement with FA. Base coat renders exhibited good resistance to Na2SO4 crystallization. The use of ethylene vinyl acetate copolymer enhanced the adhesion of renders to substrate.
Danuta Barnat-Hunek; Małgorzata Grzegorczyk-Frańczak; Beata Klimek; Milena Pavlíková; Zbyšek Pavlík. Properties of multi-layer renders with fly ash and boiler slag admixtures for salt-laden masonry. Construction and Building Materials 2021, 278, 122366 .
AMA StyleDanuta Barnat-Hunek, Małgorzata Grzegorczyk-Frańczak, Beata Klimek, Milena Pavlíková, Zbyšek Pavlík. Properties of multi-layer renders with fly ash and boiler slag admixtures for salt-laden masonry. Construction and Building Materials. 2021; 278 ():122366.
Chicago/Turabian StyleDanuta Barnat-Hunek; Małgorzata Grzegorczyk-Frańczak; Beata Klimek; Milena Pavlíková; Zbyšek Pavlík. 2021. "Properties of multi-layer renders with fly ash and boiler slag admixtures for salt-laden masonry." Construction and Building Materials 278, no. : 122366.
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Danuta Barnat-Hunek; Jacek Góra; Marcin Widomski. Correction: Barnat-Hunek, D., et al. Durability of Hydrophobic/Icephobic Coatings in Protection Lightweight Concrete with Waste Aggregate. Materials 2021, 14, 101. Materials 2021, 14, 620 .
AMA StyleDanuta Barnat-Hunek, Jacek Góra, Marcin Widomski. Correction: Barnat-Hunek, D., et al. Durability of Hydrophobic/Icephobic Coatings in Protection Lightweight Concrete with Waste Aggregate. Materials 2021, 14, 101. Materials. 2021; 14 (3):620.
Chicago/Turabian StyleDanuta Barnat-Hunek; Jacek Góra; Marcin Widomski. 2021. "Correction: Barnat-Hunek, D., et al. Durability of Hydrophobic/Icephobic Coatings in Protection Lightweight Concrete with Waste Aggregate. Materials 2021, 14, 101." Materials 14, no. 3: 620.
In the present work, for the first time, free vibration response of angle ply laminates with uncertainties is attempted using Multivariate Adaptive Regression Spline (MARS), Artificial Neural Network-Particle Swarm Optimization (ANN-PSO), Gaussian Process Regression (GPR), and Adaptive Network Fuzzy Inference System (ANFIS). The present approach employed 2D C 0 stochastic finite element (FE) model based on the Third Order Shear Deformation Theory (TSDT) in conjunction with MARS, ANN-PSO, GPR, and ANFIS. The TSDT model used eliminates the requirement of shear correction factor owing to the consideration of the actual parabolic distribution of transverse shear stress. Zero transverse shear stress at the top and bottom of the plate is enforced to compute higher-order unknowns. C 0 FE model makes it commercially viable. Stochastic FE analysis done with Monte Carlo Simulation (MCS) FORTRAN inhouse code, selection of design points using a random variable framework, and soft computing with MARS, ANN-PSO, GPR, and ANFIS is implemented using MATLAB in-house code. Following the random variable frame, design points were selected from the input data generated through Monte Carlo Simulation. A total of four-mode shapes are analyzed in the present study. The comparison study was done to compare present work with results in the literature and they were found in good agreement. The stochastic parameters are Young’s elastic modulus, shear modulus, and the Poisson ratio. Lognormal distribution of properties is assumed in the present work. The current soft computation models shrink the number of trials and were found computationally efficient as the MCS-based FE modelling. The paper presents a comparison of MARS, ANN-PSO, GPR, and ANFIS algorithm performance with the stochastic FE model based on TSDT.
Bharat Mishra; Ajay Kumar; Jacek Zaburko; Barbara Sadowska-Buraczewska; Danuta Barnat-Hunek. Dynamic Response of Angle Ply Laminates with Uncertainties Using MARS, ANN-PSO, GPR and ANFIS. Materials 2021, 14, 395 .
AMA StyleBharat Mishra, Ajay Kumar, Jacek Zaburko, Barbara Sadowska-Buraczewska, Danuta Barnat-Hunek. Dynamic Response of Angle Ply Laminates with Uncertainties Using MARS, ANN-PSO, GPR and ANFIS. Materials. 2021; 14 (2):395.
Chicago/Turabian StyleBharat Mishra; Ajay Kumar; Jacek Zaburko; Barbara Sadowska-Buraczewska; Danuta Barnat-Hunek. 2021. "Dynamic Response of Angle Ply Laminates with Uncertainties Using MARS, ANN-PSO, GPR and ANFIS." Materials 14, no. 2: 395.
The aim of the research presented in this paper is to evaluate the feasibility of using hydrophobic agents based on organosilicon compounds for surface protection of lightweight concrete modified with waste polystyrene. The experimental part pertains to the physical and mechanical properties of polystyrene-modified lightweight concrete. The concrete samples were prepared with the following ingredients: CEM I 42.5 R cement, recycled polystyrene (0–2 mm), quartz sand (0–2 mm), coarse river aggregate (2–16 mm), and water. Silane and tetramethoxysilane were employed for surface hydrophobization. Concrete with 20% polystyrene exhibits high porosity (25.22%), which is related to an increase in absorptivity (14.75%) compared to the reference concrete. The hydrophobized concrete is characterized by the lowest surface free energy (SFE) value, which is 7 or 11 times lower than the value of reference concrete, depending on the agents. The test on the contact angle (CA) was performed before and after the frost-resistance test (F–T test). Lower SFE translates into lower adhesive properties, higher resistance of the material to the infiltration of water and corrosive compounds, e.g., salts, and higher resistance to freezing and thawing cycles. Silane and tetramethoxysilane coating raised frost resistance by 54–58% compared to the reference samples. This agent reduced absorptivity by 30%. Recycled polystyrene can be successfully used to produce lightweight concrete (LC) with high durability provided by hydrophobic/icephobic coatings.
Danuta Barnat-Hunek; Jacek Góra; Marcin K. Widomski. Durability of Hydrophobic/Icephobic Coatings in Protection of Lightweight Concrete with Waste Aggregate. Materials 2020, 14, 101 .
AMA StyleDanuta Barnat-Hunek, Jacek Góra, Marcin K. Widomski. Durability of Hydrophobic/Icephobic Coatings in Protection of Lightweight Concrete with Waste Aggregate. Materials. 2020; 14 (1):101.
Chicago/Turabian StyleDanuta Barnat-Hunek; Jacek Góra; Marcin K. Widomski. 2020. "Durability of Hydrophobic/Icephobic Coatings in Protection of Lightweight Concrete with Waste Aggregate." Materials 14, no. 1: 101.
The paper presented aimed at examining the effect of a fiber-reinforced concrete layer in the compressed zone on the mechanical properties of composite fiber-reinforced concrete slabs. Steel fibers (SF) and polypropylene fibers (PP) in the amount of 1% in relation to the weight of the concrete mix were used as reinforcement fibers. The mixture compositions were developed for the reference concrete, steel fiber concrete and polypropylene fiber concrete. The mechanical properties of the concrete obtained from the designed mixes such as compressive strength, bending strength, modulus of elasticity and frost resistance were tested. The main research elements, i.e., slabs with a reinforced compression zone in the form of a 30 mm layer of concrete with PP or SF were made and tested. The results obtained were compared with a plate made without a strengthening layer. The bending resistance, load capacity and deflection tests were performed on the slabs. A scheme of crack development during the test and a numerical model for the slab element were also devised. The study showed that the composite slabs with fiber-reinforced concrete with PP in the upper layer achieved 12% higher load capacity, with respect to the reference slabs.
Barbara Sadowska-Buraczewska; Małgorzata Szafraniec; Danuta Barnat-Hunek; Grzegorz Łagód. Flexural Behavior of Composite Concrete Slabs Made with Steel and Polypropylene Fibers Reinforced Concrete in the Compression Zone. Materials 2020, 13, 3616 .
AMA StyleBarbara Sadowska-Buraczewska, Małgorzata Szafraniec, Danuta Barnat-Hunek, Grzegorz Łagód. Flexural Behavior of Composite Concrete Slabs Made with Steel and Polypropylene Fibers Reinforced Concrete in the Compression Zone. Materials. 2020; 13 (16):3616.
Chicago/Turabian StyleBarbara Sadowska-Buraczewska; Małgorzata Szafraniec; Danuta Barnat-Hunek; Grzegorz Łagód. 2020. "Flexural Behavior of Composite Concrete Slabs Made with Steel and Polypropylene Fibers Reinforced Concrete in the Compression Zone." Materials 13, no. 16: 3616.
The paper explores the possibility of applying the nanopolymer trietoxiisobutylsilane and methyl silicon resin for hydrophobisation of mortars with the lightweight aggregate addition (PVC + PUR + WD). The investigation involved the mortars with two types of hydrophobic agents, without and with waste addition (5; 10; 15%). The results and discussion referring to their micro-structure together with the interfacial transition zone (ITZ). Physical and mechanical properties, frost resistance, water absorption, as well as vapor permeability were investigated. The influence of hydrophobisation on the SFE value, CA and microroughness characteristic was also determined. The surface hydrophobisation of mortars using the A1 preparation reduced the water absorption and vapour permeability by 94.6%. The A1 agent reduced the weight loss after the F-T test by 88.9%. Surface hydrophobisation increased the CA value, and reduced the SFE value for the L5 and L10 mortars by over 3 times. The greatest effect on the decrease of A2 preparation roughness was proven. The efficiency of both agents was confirmed by the capillary uptake test conducted using the TDR equipment.
Danuta Barnat-Hunek; Małgorzata Grzegorczyk-Frańczak; Zbigniew Suchorab. Surface hydrophobisation of mortars with waste aggregate by nanopolymer trietoxi-isobutyl-silane and methyl silicon resin. Construction and Building Materials 2020, 264, 120175 .
AMA StyleDanuta Barnat-Hunek, Małgorzata Grzegorczyk-Frańczak, Zbigniew Suchorab. Surface hydrophobisation of mortars with waste aggregate by nanopolymer trietoxi-isobutyl-silane and methyl silicon resin. Construction and Building Materials. 2020; 264 ():120175.
Chicago/Turabian StyleDanuta Barnat-Hunek; Małgorzata Grzegorczyk-Frańczak; Zbigniew Suchorab. 2020. "Surface hydrophobisation of mortars with waste aggregate by nanopolymer trietoxi-isobutyl-silane and methyl silicon resin." Construction and Building Materials 264, no. : 120175.
Renovation renders are systems with drying and desalinating functions. The paper was aimed at investigating the influence of adding two different types of synthetic zeolites (Na-X, Na-P1) and natural zeolite (clinoptilolite) on the properties of the base layer of renovation renders. The material was also modified with perlite. The highest compressive strength (4.98 N/mm2) was achieved by the renders with clinoptilolite. The superior frost resistance was obtained by the renders without perlite addition (0.96% for clinoptilolite, 1.07% for Na-P1 and 1.53% for Na-X). The lowest mass loss after the salt test occurred in the render with Na-X zeolite and reached 4.2%. The renders with natural zeolite were characterized by the mass loss in the range as low as 0.21–0.45%.
Joanna Styczeń; Danuta Barnat-Hunek; Rafał Panek; Wojciech Franus. The microstructural and physical properties of renovation renders with clinoptilolite, Na-P1 and Na-X zeolites. Construction and Building Materials 2020, 261, 120016 .
AMA StyleJoanna Styczeń, Danuta Barnat-Hunek, Rafał Panek, Wojciech Franus. The microstructural and physical properties of renovation renders with clinoptilolite, Na-P1 and Na-X zeolites. Construction and Building Materials. 2020; 261 ():120016.
Chicago/Turabian StyleJoanna Styczeń; Danuta Barnat-Hunek; Rafał Panek; Wojciech Franus. 2020. "The microstructural and physical properties of renovation renders with clinoptilolite, Na-P1 and Na-X zeolites." Construction and Building Materials 261, no. : 120016.
The aim of the research presented in the paper was to evaluate the feasibility of using hydrophobic preparations based on organosilicon compounds for protection treatment on the lightweight concrete modified with sawdust. The experimental part of the work concerns the physical and mechanical properties of lightweight concrete and the influence of two hydrophobic agents on the contact angle of the material. Lightweight concrete contact angle (θw) was determined as a time function using one measuring liquid. Water repellent coatings in lightweight concrete structure with the coarse aggregate sawdust (CASD) using electron microscopy were presented. The effectiveness of hydrophobisation of porous lightweight concretes was determined on the basis of the research. For the hydrophobic surface, the contact angle decreased and it depended on the used agents. The lowest contact angle of 40.2° (t=0) was obtained for reference concrete before hydrophobisation and 112.2° after hydrophobisation with a methyl-silicone resin based on organic solvent. The results of scientific research confirm the possibility to produce lightweight concretes modified with CASD with adequate surface protection against external moisture.
Małgorzata Szafraniec; Danuta Barnat-Hunek. Evaluation of the contact angle and wettability of hydrophobised lightweight concrete with sawdust. Budownictwo i Architektura 2020, 19, 019 -032.
AMA StyleMałgorzata Szafraniec, Danuta Barnat-Hunek. Evaluation of the contact angle and wettability of hydrophobised lightweight concrete with sawdust. Budownictwo i Architektura. 2020; 19 (2):019-032.
Chicago/Turabian StyleMałgorzata Szafraniec; Danuta Barnat-Hunek. 2020. "Evaluation of the contact angle and wettability of hydrophobised lightweight concrete with sawdust." Budownictwo i Architektura 19, no. 2: 019-032.
This article presents research results relating to the potential for waste utilization in the form of polymer optical fiber (POF) scraps. This material is difficult to recycle due to its diverse construction. Three different volumes of POF were used in concrete in these tests: 1%, 2%, and 3%. The experimental studies investigated the basic properties of the concrete, the elastic and dynamic moduli, as well as deformation and deflection of reinforced beams. The microstructures, including the interfacial transition zones (ITZs), were recorded and analyzed using a scanning electron microscope. It was observed that 180 freezing–thawing cycles reduced the concrete frost resistance containing 3% POFs by half compared to the control concrete. The resistance to salt crystallization of this concrete decreased by about 55%. POFs have significant effects on the splitting tensile and flexural strengths compared to the compressive strength. The control beams were destroyed during the four-point static bending tests at half the force applied to the beams that were reinforced with POFs.
Zbigniew Suchorab; Małgorzata Franus; Danuta Barnat-Hunek. Properties of Fibrous Concrete Made with Plastic Optical Fibers from E-Waste. Materials 2020, 13, 2414 .
AMA StyleZbigniew Suchorab, Małgorzata Franus, Danuta Barnat-Hunek. Properties of Fibrous Concrete Made with Plastic Optical Fibers from E-Waste. Materials. 2020; 13 (10):2414.
Chicago/Turabian StyleZbigniew Suchorab; Małgorzata Franus; Danuta Barnat-Hunek. 2020. "Properties of Fibrous Concrete Made with Plastic Optical Fibers from E-Waste." Materials 13, no. 10: 2414.
Biaxial buckling of the laminated composite rhombic (skew) plate with mass variations in the form of openings and adding extra mass at the center of the plate was studied using improved shear deformation theory (ISDT). The ISDT mathematical model incorporates third-degree variation of the thickness coordinate in the displacement formulation. In the presented theory, the use of shear correction factor was eliminated and a second-order variation of transverse shear strains through the plate thickness was implied. A computer-based algorithm based on the C0 finite-element formulation of the mathematical model was developed to analyze the buckling behavior of a laminated composite skew plate with openings and extra mass imposed at the center of the plate. Due to a lack of results in the literature based on the ISDT of the considered problem of biaxial buckling of laminated composite skew plates with openings cutout and extra mass imposed at the center of plate, the present results were validated with the suitable results available for laminated composite plates without openings/extra mass imposed at the center of plate with zero skew angle. The new results were obtained by varying the geometry, boundary conditions, ply orientations, and skew angles.
Anish; Ajay Kumar; Anupam Chakrabarti; Marcin Widomski; Danuta Barnat-Hunek. Rhombic Laminates with Mass Variations under Dual-Axis Compression. Journal of Aerospace Engineering 2020, 33, 04020013 .
AMA StyleAnish, Ajay Kumar, Anupam Chakrabarti, Marcin Widomski, Danuta Barnat-Hunek. Rhombic Laminates with Mass Variations under Dual-Axis Compression. Journal of Aerospace Engineering. 2020; 33 (3):04020013.
Chicago/Turabian StyleAnish; Ajay Kumar; Anupam Chakrabarti; Marcin Widomski; Danuta Barnat-Hunek. 2020. "Rhombic Laminates with Mass Variations under Dual-Axis Compression." Journal of Aerospace Engineering 33, no. 3: 04020013.
The paper explores the possibility of covering the mortar with the lightweight aggregate by the nanopolymer silane and siloxane as surface hydrophobisation. The investigation involved the mortars with two types of hydrophobic agents diluted with water in a ratio of 1:4 and 1:8. Mortar wetting properties were determined by measuring the absorbability, water vapor diffusion, contact angle (CA) and surface free energy (SFE) of their structure. Surface micro-roughness and 2D topography were evaluated. Scanning electron microscopy (SEM) has shown the microstructure and distribution of pores in mortars. The reduction in absorbency after the first day of testing by 87% was shown. An improvement in frost resistance after 25 cycles by 97% and an 18-fold decrease in weight loss after the sulphate crystallization test were observed. The hydrophobic coating reduces the SFE of mortars and increases the CA. In the case of using silanes, a 9-fold increase CA was observed.
Małgorzata Szafraniec; Danuta Barnat-Hunek; Małgorzata Grzegorczyk-Frańczak; Maciej Trochonowicz. Surface Modification of Lightweight Mortars by Nanopolymers to Improve Their Water-Repellency and Durability. Materials 2020, 13, 1350 .
AMA StyleMałgorzata Szafraniec, Danuta Barnat-Hunek, Małgorzata Grzegorczyk-Frańczak, Maciej Trochonowicz. Surface Modification of Lightweight Mortars by Nanopolymers to Improve Their Water-Repellency and Durability. Materials. 2020; 13 (6):1350.
Chicago/Turabian StyleMałgorzata Szafraniec; Danuta Barnat-Hunek; Małgorzata Grzegorczyk-Frańczak; Maciej Trochonowicz. 2020. "Surface Modification of Lightweight Mortars by Nanopolymers to Improve Their Water-Repellency and Durability." Materials 13, no. 6: 1350.
The use of recycled concrete aggregates (RCA) in high performance concrete (HPC) was analyzed. The paper presents the experimental studies of model reinforced concrete beams with a rectangular section using high-performance recycled aggregates. Two variable contents of recycled aggregate concrete were used in this study: 50% and 100%. The experimental analyses conducted as immediate studies concerned the following issues: short time loads-deflection, load-carrying capacity of beams, deformation of concrete, cracks, and long-term loads-deflection. The comparative analysis involves the behavior of beams made of high performance concrete-high strength concrete (HPC-HSC) recycled aggregates with model control elements made of regular concrete based on natural aggregates. The deflection values for the recycled aggregate beams were 20% higher than in the case of the control beams made of HPC-HSC exclusively. Replacement of aggregate with recycled concrete aggregate resulted in a large decrease in the value of these two parameters, i.e., compression strength by about 42% and modulus of elasticity by about 33%.
Barbara Sadowska-Buraczewska; Danuta Barnat-Hunek; Małgorzata Szafraniec. Influence of Recycled High-Performance Aggregate on Deformation and Load-Carrying Capacity of Reinforced Concrete Beams. Materials 2020, 13, 186 .
AMA StyleBarbara Sadowska-Buraczewska, Danuta Barnat-Hunek, Małgorzata Szafraniec. Influence of Recycled High-Performance Aggregate on Deformation and Load-Carrying Capacity of Reinforced Concrete Beams. Materials. 2020; 13 (1):186.
Chicago/Turabian StyleBarbara Sadowska-Buraczewska; Danuta Barnat-Hunek; Małgorzata Szafraniec. 2020. "Influence of Recycled High-Performance Aggregate on Deformation and Load-Carrying Capacity of Reinforced Concrete Beams." Materials 13, no. 1: 186.
Nanocellulose, being a material with nanodimensions, is characterized by high tensile strength, high modulus of elasticity, low thermal expansion, and relatively low density, as well as exhibiting very good electrical conductivity properties. The paper presents the results of research on cement mortars with the addition of nanocrystals cellulose, applied in three different amounts (0.5%, 1.0%, and 1.5%) by weight of cement, including: physical and mechanical properties, frost resistance and resistance against the detrimental effect of salt, and microstructure examination (SEM). Along with an increase in amount of admixture, the weight loss following frost resistance and salt crystallization tests is reduced. Studies have shown that the addition of nanocrystalline cellulose improves the compressive and flexural strength by 27.6% and 10.9%, respectively. After 50 freezing and thawing (F–T) cycles for the mortars with 1.5% nanocellulose admixture, an improvement in frost resistance by 98% was observed. In turn, the sulfate crystallization tests indicated a 35-fold decrease in weight loss following 1.5% nanopolymer addition to the mortar.
Danuta Barnat-Hunek; Małgorzata Grzegorczyk-Frańczak; Monika Szymańska-Chargot; Grzegorz Łagód. Effect of Eco-Friendly Cellulose Nanocrystals on Physical Properties of Cement Mortars. Polymers 2019, 11, 2088 .
AMA StyleDanuta Barnat-Hunek, Małgorzata Grzegorczyk-Frańczak, Monika Szymańska-Chargot, Grzegorz Łagód. Effect of Eco-Friendly Cellulose Nanocrystals on Physical Properties of Cement Mortars. Polymers. 2019; 11 (12):2088.
Chicago/Turabian StyleDanuta Barnat-Hunek; Małgorzata Grzegorczyk-Frańczak; Monika Szymańska-Chargot; Grzegorz Łagód. 2019. "Effect of Eco-Friendly Cellulose Nanocrystals on Physical Properties of Cement Mortars." Polymers 11, no. 12: 2088.
This article presents test results and examines the possibilities of using aggregate from ceramic waste for mineral-asphalt mixtures. In addition, the mineral composition, physical and mechanical properties of aggregates from natural raw materials such as dolomite, granodiorite and waste ceramic aggregate (introduced as a partial substitute for the main aggregate) were analyzed. The shape of grains was examined by determining the shape and flatness index of aggregates, resistance to grinding and frost resistance. The tested properties have a direct impact on the durability of road surfaces. To this end, the adhesion of asphalt to the surface of the aggregates used was additionally determined. Determination of surface roughness and two-dimensional (2D) topography of tested aggregates was carried out. The aggregates microstructure examination, coupled with the energy-dispersive X-ray spectroscopy (EDS) analysis, was conducted to determine the morphology and texture of the aggregates as well as to identify the basic chemical components.
Wojciech Andrzejuk; Danuta Barnat-Hunek; Jacek Góra. Physical Properties of Mineral and Recycled Aggregates Used to Mineral-Asphalt Mixtures. Materials 2019, 12, 3437 .
AMA StyleWojciech Andrzejuk, Danuta Barnat-Hunek, Jacek Góra. Physical Properties of Mineral and Recycled Aggregates Used to Mineral-Asphalt Mixtures. Materials. 2019; 12 (20):3437.
Chicago/Turabian StyleWojciech Andrzejuk; Danuta Barnat-Hunek; Jacek Góra. 2019. "Physical Properties of Mineral and Recycled Aggregates Used to Mineral-Asphalt Mixtures." Materials 12, no. 20: 3437.
The paper presents the possibility of using the liquid crystal display (LCD) waste as a partial substitute of fine aggregate. Concretes with two types of cement, CEM I 42.5 R and CEM II/B-S 42.5 N, with and without LCD addition, were investigated. The properties that influence the structures exposed to severe environments were examined. The results and analyses pertaining to their micro-structure, including interfacial transition zone (ITZ), were presented as well. All concretes exhibited good freeze–thaw (F–T) resistance after 150 F–T cycles. The water-tightness was established as 0.8 MPa. All concretes both with and without LCD achieved the same class C50/60.
Jacek Góra; Małgorzata Franus; Danuta Barnat-Hunek; Wojciech Franus. Utilization of Recycled Liquid Crystal Display (LCD) Panel Waste in Concrete. Materials 2019, 12, 2941 .
AMA StyleJacek Góra, Małgorzata Franus, Danuta Barnat-Hunek, Wojciech Franus. Utilization of Recycled Liquid Crystal Display (LCD) Panel Waste in Concrete. Materials. 2019; 12 (18):2941.
Chicago/Turabian StyleJacek Góra; Małgorzata Franus; Danuta Barnat-Hunek; Wojciech Franus. 2019. "Utilization of Recycled Liquid Crystal Display (LCD) Panel Waste in Concrete." Materials 12, no. 18: 2941.
The study on the physical properties and durability of concrete with admixture cellulose nanofibrils (ACNF) and cellulose nanocrystals (CCNC) was presented in the paper. The following characteristics of the concrete were defined: absorptivity, density, apparent density, open porosity, contact angle (CA), surface free energy (SFE), compressive strength, flexural tensile strength, freezing-thawing resistance. The use of ACNF and CCNC results in different wetting and adhesion properties of concrete. The highest CCNC addition yielded a concrete with the lowest CA with water and the highest SFE values that evidenced the increased adhesion properties and wettability. The microstructure of concrete with ACNF and CCNC and distribution of cracks and pores within them were investigated by scanning electron microscope (SEM). CCNC improves the freezing-thawing resistance.
Danuta Barnat-Hunek; Monika Szymanska-Chargot; Monika Jarosz-Hadam; Grzegorz Łagód. Effect of cellulose nanofibrils and nanocrystals on physical properties of concrete. Construction and Building Materials 2019, 223, 1 -11.
AMA StyleDanuta Barnat-Hunek, Monika Szymanska-Chargot, Monika Jarosz-Hadam, Grzegorz Łagód. Effect of cellulose nanofibrils and nanocrystals on physical properties of concrete. Construction and Building Materials. 2019; 223 ():1-11.
Chicago/Turabian StyleDanuta Barnat-Hunek; Monika Szymanska-Chargot; Monika Jarosz-Hadam; Grzegorz Łagód. 2019. "Effect of cellulose nanofibrils and nanocrystals on physical properties of concrete." Construction and Building Materials 223, no. : 1-11.
In the presented paper, a study of bi-axial buckling of the laminated composite plate with mass variation through the cutout and additional mass is carried out using the improved shear deformation theory (ISDT). The ISDT mathematical model employs a cubic variation of thickness co-ordinates in the displacement field. A realistic parabolic distribution of transverse shear strains through the plate thickness is assumed and the use of shear correction factor is avoided. A C° finite element formulation of the mathematical model is developed to analyze the buckling behavior of laminated composite plate with cutout and additional mass. As no results based on ISDT for the considered problem of bi-axial buckling of the laminated composite plate with mass variation are available in the literature, the obtained results are validated with the data available for a laminated composite plate without cutout and additional mass. Novel results are obtained by varying geometry, boundary conditions and ply orientations.
Anish; Abhay Chaubey; Ajay Kumar; Bartłomiej Kwiatkowski; Danuta Barnat-Hunek; Marcin K. Widomski. Bi-Axial Buckling of Laminated Composite Plates Including Cutout and Additional Mass. Materials 2019, 12, 1750 .
AMA StyleAnish, Abhay Chaubey, Ajay Kumar, Bartłomiej Kwiatkowski, Danuta Barnat-Hunek, Marcin K. Widomski. Bi-Axial Buckling of Laminated Composite Plates Including Cutout and Additional Mass. Materials. 2019; 12 (11):1750.
Chicago/Turabian StyleAnish; Abhay Chaubey; Ajay Kumar; Bartłomiej Kwiatkowski; Danuta Barnat-Hunek; Marcin K. Widomski. 2019. "Bi-Axial Buckling of Laminated Composite Plates Including Cutout and Additional Mass." Materials 12, no. 11: 1750.