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Article
Chemistry, Multidisciplinary
Evgenii M. Shcherban' et al.
Summary: The relationship between the structure and properties of geopolymers in aggressive environments was studied, and the effectiveness of the developed composition and technological solutions was confirmed. Geopolymer concretes showed better performance than cement-based concretes in terms of strength loss and weight loss. Furthermore, raising the heat treatment temperature to 80 degrees Celsius increased the compressive strength of geopolymer binders.
APPLIED SCIENCES-BASEL
(2022)
Article
Construction & Building Technology
Muhammad Affan et al.
Summary: This study examines the feasibility of using jute fiber reinforced concrete to mitigate freeze-thaw deterioration. The effects of different freeze-thaw cycles on the dynamic and mechanical behavior of concrete are analyzed, and empirical equations for predicting pavement design strengths based on fiber addition and freeze-thaw cycles are developed.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Composites
Huyen Bui et al.
Summary: This study investigates the deterioration mechanism and mechanical properties of mortars containing coconut fibers due to repeated wetting and drying. The results indicate a significant decrease in compressive and flexural strengths after multiple wetting and drying cycles.
JOURNAL OF COMPOSITES SCIENCE
(2022)
Article
Chemistry, Physical
Zeljko Kos et al.
Summary: A comparison was made between steel and polypropylene fibers in fiber-reinforced concrete for industrial floors and road pavements, focusing on their impact on strength, frost resistance, abrasion, and corrosion resistance in an acidic environment. Steel fibers demonstrated a more significant increase in compressive strength, while both types of fibers equally improved flexural strength. Dispersed reinforcement reduced abrasion resistance and increased frost resistance, enhancing the durability of industrial floors and road pavements. The use of polypropylene fibers was found to be more cost-effective.
Article
Green & Sustainable Science & Technology
Yi Wu et al.
Summary: This study evaluated the effects of porosity, compressive strength, and elastic modulus on pervious concrete before and after freeze-thaw cycles. The results showed that the effective modulus and effective stress were closely related to porosity, and the fiber enhanced the strength of the cementation layer. The findings provide insights into the fracture mechanism of pervious concrete and the effects of freeze-thaw cycles.
Article
Materials Science, Multidisciplinary
Fei Teng et al.
Summary: This study investigated the seismic performance of RC piers after seawater freeze-thaw cycles using numerical simulation. The results of the simulation matched well with the experimental results, and the influence of different parameters was analyzed.
Article
Chemistry, Physical
Jiguo Zhou et al.
Summary: This study examines the changes in the performance of concrete after initial load damage and salt freezing. It finds that freeze-thaw cycles have a negative impact on the compressive strength of concrete and lead to changes in pore characteristics. The presence of salt solutions exacerbates these effects and reduces the permeability resistance of the concrete.
Article
Chemistry, Physical
Alexey N. Beskopylny et al.
Summary: Currently, in civil engineering, the focus is on minimizing the cost and improving the efficiency of manufacturing and construction of hollow structures. This study aims to theoretically and experimentally explore the potential of using vibrocentrifugation technology and ground granulated blast-furnace slag to create improved variotropic structures of concrete. Various methods were used, including electron microscopy, laser granulometry, and X-ray diffraction, to analyze the composition, macrostructure, microstructure, and final properties of the modified concrete. The optimal dosage of slag was determined to be 40%, resulting in an increase in strength indicators by 16% to 27% and density by 3%.
Review
Chemistry, Physical
San Luo et al.
Summary: This study summarizes the important findings of the freeze-thaw durability performance of concrete pavement, identifies knowledge gaps, and proposes future research needs. The study reveals that external loading and environmental factors can accelerate freeze-thaw damage and suggests various methods to mitigate the damage. The results of this study are important for understanding how to enhance the freeze-thaw durability of concrete pavement.
Article
Chemistry, Physical
Marija Vaiciene et al.
Summary: The aim of this study was to investigate the effects of municipal solid waste incineration bottom ash on the physical and mechanical properties and durability of cement concrete. The results showed that concrete modified with 6% bottom ash had improved density, compressive strength, ultrasonic pulse velocity, and water absorption rate. The frost resistance of concrete modified with 6%, 9%, and 12% bottom ash met the strength grade F100, indicating its suitability for construction works.
Article
Chemistry, Physical
Jiguo Zhou et al.
Summary: This study investigates the damage law of cement-concrete under the effects of salt erosion and freeze-thaw cycles. Concrete specimens are subjected to quick salt freezing cycles using NaCl, NaHCO3, and Na2SO4 solutions to simulate saline soil conditions. Compressive strength, mass loss, and dynamic elastic modulus (DEM) are analyzed during the freeze-thaw cycles. Low-field nuclear magnetic resonance (NMR) and scanning electronic microscopy are employed to study the microstructure changes in the concrete specimens. The results show significant increases in loss of compressive strength, mass, DEM, and NMR spectrum signal for concrete specimens undergoing salt freeze-thaw cycles. It is found that the number of internal cracks in the concrete structure increases due to the combined action of salt crystallization, moisture absorption, and freeze-thaw. Changes in the microscopic pore volume correlate with the macro mechanical properties of the concrete. The correlation coefficients between NMR spectrum changes and compressive strength changes suggest that these changes can be used as potential evaluation indexes for salt frozen damage to concrete structures.
Article
Polymer Science
Alexey N. Beskopylny et al.
Summary: One disadvantage of reinforced concrete is its heavy weight. This study investigates the use of polymer composite reinforcement and variotropic building elements as alternatives. Numerical models were developed to analyze short bending concrete elements with polymer composite rods. It was found that carbon composite reinforcement has advantages over glass or basalt composite, providing greater bearing capacity. The study also observed a clear redistribution of stresses in favor of variotropic cross sections.
Article
Construction & Building Technology
Alexey Beskopylny et al.
Summary: The usage of nano modifying additives for developing new building materials is an important scientific problem. This study investigates the effect of a nano modifying additive on the structure of heavy concrete during vibrocentrifugation. It was found that adding 10% micro-silica to concrete resulted in the highest compressive and tensile strengths, as well as the smallest strains. Graphical dependencies of concrete properties on its composition were obtained.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Chemistry, Physical
Qi Yu et al.
Summary: In this study, a thermodynamic model is used to investigate the carbonation reactions in cement-based materials, and the effects of CO2 concentration and amount on the carbonation behaviors of mortar are discussed. The study found that the mechanisms of carbonation reaction in cement-based materials differ at different CO2 concentrations, and most hydrate phases have corresponding CO2 concentration thresholds for triggering carbonation.
Article
Chemistry, Physical
Fuyuan Gong et al.
Summary: To meet durability design requirements for concrete under frost damage, various test standards have been proposed. However, there are significant differences in the quantitative responses of frost resistance derived from tests following different standards. This study presents a statistical analysis to propose a predictable model for calculating a Durability Factor (DF) that is more convenient for engineering applications and takes into account uncertainties and errors in specific tests.
Article
Chemistry, Physical
Shuhua Zhang et al.
Summary: Freeze-thaw cycles and steel bar corrosion have significant impacts on the mechanical properties and durability of hydraulic concrete, especially in cold environments. The influence of freeze-thaw cycles on bond strength is greater, and a corrosion rate of <= 3% can offset some of the damage.
Article
Chemistry, Physical
Lei Xu et al.
Summary: This paper investigates the durability of airport pavement concrete and shows that the addition of fiber and the use of surface treatment methods can enhance the frost resistance of concrete. The results indicate that modified polyester synthetic fiber has the best effect on improving the frost resistance of concrete.
Article
Chemistry, Physical
Da Wei et al.
Summary: This study comprehensively evaluates the sustainable application potential of waste concrete in a freeze-thaw environment, considering performance, environmental load, and economic benefit. It investigates the effects of freeze-thaw damage on the physical properties of recycled coarse aggregate concrete (RAC) and the mechanical and frost resistance of RAC under flexural stress. The study concludes that freeze-thaw damage gradually deteriorates the physical properties of recycled coarse aggregate (RCA) and adversely affects the mechanical properties and frost resistance of RAC. The reuse of waste concrete after freeze-thaw failure requires higher economic input, higher environmental load, lower output efficiency, and sustainability.
Article
Chemistry, Physical
Guixiang Chen et al.
Summary: This research developed a corrosion-fatigue life prediction model for prestressed concrete beams, considering the coupled effect of the chloride attack environment and train load. The study found that train frequency, chloride attack environment grade, and environment temperature have a significant impact on the corrosion-fatigue life of the beams.
Article
Materials Science, Composites
Alexey N. Beskopylny et al.
Summary: This article explores a new method for activating concrete aggregates and finds that using an aqueous solution of natural bischofite is the most effective. Through this method, the strength and strain characteristics of the concrete are significantly improved. Additionally, an innovative technology is proposed for manufacturing improved lightweight fiber-reinforced concrete, which can save on manufacturing costs and improve structural properties.
JOURNAL OF COMPOSITES SCIENCE
(2022)
Article
Materials Science, Composites
Yoganantham Chinnasamy et al.
Summary: GFRP is an advanced material with many advantages, but exhibits brittle behavior under severe loading conditions. The capacity of GFRP sections can be improved by infilling with concrete, making them suitable for earthquake-prone areas.
JOURNAL OF COMPOSITES SCIENCE
(2022)
Article
Materials Science, Composites
Ella Spurina et al.
Summary: Three-dimensional concrete printing (3DCP) is a common technology in the construction industry, but the durability of printed concrete is not well-studied. This paper explores the use of air-entraining agents (AEAs) in 3D concrete and its effect on fresh and hardened properties, especially frost resistance. The results show that adding AEA can improve the frost resistance of printed concrete, but it decreases the flexural and compressive strength.
JOURNAL OF COMPOSITES SCIENCE
(2022)
Article
Construction & Building Technology
Jacek Golaszewski et al.
Summary: This study compares the effect of different types of limestone powder on the freeze-thaw resistance of concrete, and finds that the addition of limestone powder does not significantly affect the frost resistance of concrete.
Article
Construction & Building Technology
Shengyuan Li et al.
Summary: The main aim of this research is to determine the degradation mechanism of reinforced concrete beams subjected to sustained loading and multi-environmental factors. Concrete degradation and steel bar corrosion were continuously measured during each degradation period to analyze the mechanism. This study contributes to a comprehensive understanding of reinforced concrete beams under sustained loading and multi-environmental factors.
Article
Construction & Building Technology
Petr Lehner et al.
Summary: This paper presents and compares the results of numerical calculations on the resistance of the reinforced concrete bridge deck to chlorides with different approaches to the diffusion coefficient of the input parameter. It points out the necessity of a correct model adjustment when using diffusion parameters obtained at different measurement times.
Article
Polymer Science
Alexey N. Beskopylny et al.
Summary: This article investigates the fundamental knowledge of cement gel formation for new generation concretes, with a focus on the differences in structure between standard vibrated concrete and centrifugally compacted concrete. The study explores the impact of different compaction techniques, such as vibration and centrifugation, on the gel formation process. Through experimental and theoretical analysis, the researchers describe the main physical and chemical processes involved in gel formation and establish the significant influence of technology on this process. The results show that centrifuged and vibrocentrifuged samples demonstrate improved indicators compared to vibrated ones, particularly in terms of strength and rheological characteristics.
Article
Polymer Science
Alexey N. Beskopylny et al.
Summary: Nano-modified concrete is a science-intensive and developing area characterized by high-strength, high density, and improved structure. This study aims to obtain new theoretical knowledge and experimental-applied dependencies related to the composition-microstructure-properties ratio of high-strength concretes with a nano-modifying additive. Laser granulometry and electron microscopy are used as methods. The most rational mode of nano-modification for high-strength concretes is grinding microsilica into nanosilica within 12 hours. A complex nano-modifier containing nanosilica, superplasticizer, hyperplasticizer, and sodium sulfate was developed. The most effective combination of factors includes 4% nanosilica content, 1.4% superplasticizer additive content, 3% hyperplasticizer additive content, and a water-cement ratio of 0.33. The strength characteristics differ by 45% to 57% compared to other combinations.
Article
Construction & Building Technology
Yan Tan et al.
Summary: By adding silica fume and polyvinyl alcohol fiber, the mechanical properties and frost resistance of concrete can be improved. The compressive and flexural strengths of concrete were found to increase, and the decrease in mass loss rate and relative dynamic elastic modulus after freeze-thaw cycles were significantly reduced. Additionally, prediction models were established to predict the damage evolution of concrete under freeze-thaw conditions.
Article
Materials Science, Composites
Petr Sivtsev et al.
Summary: This study investigated the impact of fiber-reinforced piles on the thermal field of surrounding soil, comparing basalt and steel fiber reinforcement. By using the GMsFEM method to solve the Stefan problem, the research achieved a reduction in problem size for faster calculations and defined optimal solution parameters.
JOURNAL OF COMPOSITES SCIENCE
(2021)
Article
Chemistry, Physical
Yao Yu et al.
Summary: The study revealed that as the content of recycled brick-concrete aggregate increased, the mechanical properties and freeze-thaw resistance of concrete gradually decreased; a replacement level of 15% fly ash resulted in significant enhancements in compressive strength and resistance to freeze-thaw and chloride attack; using 30% fly ash by weight notably improved the resistance to chloride ion penetration due to the lowest water-soluble chloride content.
Article
Chemistry, Physical
Xinchao Zheng et al.
Summary: This study analyzes the effects of different salt solution environments on the pore structure changes of concrete after freezing and thawing cycles. Results show that increasing freeze-thaw cycles generally lead to an increase in concrete porosity, pore area, volume, and number, resulting in reduced compressive strength. NaCl solution has the greatest influence on concrete pore changes, while CH3COOK solution has the least.
Article
Chemistry, Multidisciplinary
Hui Liu et al.
Summary: The study showed that the carbonation depth of repeatedly recycled aggregate concrete (RRAC) subjected to freeze-thaw cycles is higher than that in non-freeze-thaw conditions, due to freeze-thaw damages creating porous and cracked internal structures. As replacement rate or recycling number increased, RRAC exhibited more severe freeze-thaw damage and poorer carbonation resistance, attributed to the deteriorating quality of recycled concrete aggregate (RRCA). However, a low replacement rate of RRCA may improve carbonation resistance durability of multiple recycling RAC.
APPLIED SCIENCES-BASEL
(2021)
Article
Construction & Building Technology
Kianoush Siamardi et al.
Summary: This study investigated the impact of cement content, water-to-cement ratio, and fiber volume fraction on the mechanical and durability properties of fiber reinforced RCCP. The optimal combination of C/A and fiber V-f was found to result in the best mechanical and durability properties, with uniform distribution of fibers throughout the concrete matrix playing a key role in enhancing performance.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Lingling Li et al.
Summary: The study found that the deterioration of high-ductility concrete under sulfate attack and dry-wet cycles was mainly caused by physical and chemical attacks. The use of PVA can prevent rapid development of deterioration, and high-ductility concrete is superior to ordinary concrete in terms of sulfate resistance and dry-wet cycles.
Article
Construction & Building Technology
Bing Feng et al.
Summary: This paper experimentally examines the compressive response of hollow section, centrifugal concrete-filled GFRP tube (HS-CFGT) members, proposes new design equations, and compares them with current design specifications. New coefficients reflecting initial eccentricity and confinement are determined, aiming to improve the accuracy of predicting compressive capacity for the proposed HS-CFGT columns.
Article
Mechanics
L. Feo et al.
COMPOSITE STRUCTURES
(2020)
Article
Chemistry, Multidisciplinary
Jiao Wang et al.
APPLIED SCIENCES-BASEL
(2020)
Review
Materials Science, Multidisciplinary
Rosa Di Mundo et al.
Article
Green & Sustainable Science & Technology
Caroline Santana Rangel et al.
Article
Chemistry, Physical
Filip Chylinski et al.
Article
Chemistry, Physical
Yan Li et al.
Article
Materials Science, Composites
Peiman Azarsa et al.
JOURNAL OF COMPOSITES SCIENCE
(2020)
Article
Chemistry, Multidisciplinary
Yixin Zhang et al.
APPLIED SCIENCES-BASEL
(2019)
Article
Chemistry, Physical
Bohdan Stawiski et al.
Article
Chemistry, Physical
Jae Hong Kim et al.
Article
Green & Sustainable Science & Technology
Hanbing Liu et al.
Article
Chemistry, Physical
Tuan Duc Le et al.
Article
Construction & Building Technology
Fouad T. Al Rikabi et al.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2018)
Article
Chemistry, Physical
Jerzy Wawrzenczyk et al.
