Article
Chemistry, Physical
Roman Jaskulski, Pavel Reiterman, Wojciech Kubissa, Yaroslav Yakymechko
Summary: The study found that impregnation of recycled concrete aggregate can enhance the mechanical properties of concrete but may reduce its resistance to cyclic freezing and thawing. The order in which impregnants are applied influences the effect obtained, with cement paste being the best impregnation method.
Article
Construction & Building Technology
Fuyuan Gong, Zhao Wang, Liu Yang, Yingjie Ning, Tamon Ueda
Summary: Freeze-thaw modification can effectively remove attached mortar from recycled coarse aggregate (RCA), promoting the use of eco-friendly materials. This paper presents a mesoscale analysis of mortar deterioration during freeze-thaw modification of RCA, modeling pore size distribution, pore pressure induced by ice formation, and meso-scale constitutive laws. The deformation and mechanical behaviors during freeze-thaw cycling, as well as the crack patterns, are simulated with different types of RCA. Experiment results are also used to show the effectiveness of freeze-thaw modification. An empirical model is developed to calculate the deteriorated mechanical properties of RCA based on the numerical analysis.
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Pu Jia, Lang Li, Jin Zhou, Di Zhang, Zhongwei Guan, Jiangfeng Dong, Qingyuan Wang
Summary: The high porosity of recycled coarse aggregate limits the application of recycled aggregate concrete in civil engineering. This study experimentally investigated the combined effects of freeze-thaw damage and sulfate attack on the mechanical properties of high-performance recycled aggregate concrete. The results showed that water-exposed freeze-thaw cycles caused more severe deterioration in mass loss, elastic modulus, and compressive strength, while sulfate-exposed freeze-thaw cycles led to significant degradation in splitting tensile strength and fracture energy.
APPLIED SCIENCES-BASEL
(2022)
Article
Construction & Building Technology
Oguzhan Yavuz Bayraktar, Gokhan Kaplan, Ahmet Benli
Summary: The objective of this study was to investigate the effects of recycled fine aggregates (RFA) on the properties of concrete. The results showed that the use of RFA improved the compressive strength and abrasion resistance of the concrete.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Xi Peng, Feiting Shi, Jingnan Yang, Qiuwei Yang, Hui Wang, Junyi Zhang
Summary: Although the utilization of CWDRA is a promising way to reduce carbon emission and energy consumption, the resistance of reinforced concrete containing CWDRA to corrosion and freeze-thaw cycles is usually inferior to that containing natural aggregate. This study aims to enhance the corrosive freeze-thaw durability of green concrete by utilizing CO2 curing technology on CWDRA. The results show that CO2 treatment on CWDRA significantly alleviates the concrete damage caused by NaCl F-T cycles and enhances the compressive and flexural strength, reduces the chloride migration coefficient, and decreases the corrosion speed of reinforced concrete.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Miras Mamirov, Jiong Hu, Tara Cavalline
Summary: Recycling offers benefits in minimizing waste, but the use of recycled concrete aggregate (RCA) is limited due to the absence of effective characterization. This study aims to develop a testing protocol to characterize RCA and has achieved a better understanding of its properties. The success of the study will encourage the use of RCA in concrete production.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Chen Chen, Kai Zhang, Zhigang Yin, Jing Zhou
Summary: The performance of recycled aggregate pervious concrete (RAPC) in severe cold regions was studied. The influence of water-binder ratio, design porosity, micro silica fume, and enhancer agent on permeability and mechanical properties of RAPC was evaluated. Freeze-thaw experiments were conducted to investigate the effect of different media on mechanical properties, permeability, and anti-frost durability of RAPC. Damage evolution models of RAPC under different freeze-thaw media were established.
Article
Construction & Building Technology
Da Wei, Pinghua Zhu, Xiancui Yan, Hui Liu, Chunhong Chen, Zhen Wang
Summary: This paper evaluates the reuse potential of waste recycled aggregate concrete (RAC) as coarse recycled aggregate (CRA) for structural concrete in a freeze-thaw (FT) environment. It investigates the evolution process of FT damage on the physical properties of the second-generation CRA. The results show that the physical properties of the second-generation CRA deteriorate with the accumulation of FT damage, limiting its application in structural concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Alalea Kia
Summary: This paper reports on the development of a clogging resistant permeable pavement (CRP) with improved permeability, clogging resistance, strength and freeze-thaw durability. The performance of CRPs with different pore sizes, pore wall thicknesses and target entraining air content when exposed to freeze-thaw cycles was studied. The results show that the CRP is highly resistant to freeze-thaw degradation and does not require additional air entrainment. This study presents a high strength clogging resistant permeable pavement suitable for cold climates.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Mustafa Eken
Summary: This study investigated the possibility of using basalt, diabase, and andesite natural stones as substitutes for virgin fine aggregates in concrete. The addition of these stones significantly improved the strength, durability, and water absorption rates of the concrete samples. The compressive strengths of the samples with stone additives were significantly higher than the control sample, both in normal and challenging conditions such as freeze-thaw cycles and sulfate exposure.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Chemistry, Physical
Fan Xu, Tao Li, Chenghua Li, Zhijun Li, Sheliang Wang, Nan Zhao
Summary: By adding polypropylene fiber to recycled aggregate concrete, the brittleness can be reduced, energy absorption capacity can be increased, and crack generation and development can be suppressed. Additionally, polypropylene fiber can also alleviate the negative effects of the freeze-thaw process on the cement matrix.
Article
Green & Sustainable Science & Technology
Caifeng Lu, Qingsong Zhou, Wei Wang, Shenghuai Wei, Chen Wang
Summary: The study found that acid rain has some impact on the freeze-thaw resistance of recycled aggregate concrete, weakening its ability to resist freezing and thawing, especially with prolonged acid rain spraying time or increased acidity of acid rain. Measures need to be taken to improve the acid resistance of recycled aggregate concrete to enhance its durability.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Materials Science, Multidisciplinary
Haoxiang Luan, Jin Wu, Jiayu Pan
Summary: The study identified that the freeze-thaw resistance of recycled aggregate concrete is influenced by the recycled aggregate compositions and admixtures, with saturation degree and air void structure being key factors in freeze-thaw damage. Various proposed mechanisms were used to interpret this damage, with potential measures to enhance freeze-thaw resistance also discussed.
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
(2021)
Article
Construction & Building Technology
Yusheng Zeng, Xiaomei Li, Aiping Tang, Ning Zhao, Lin Li, Shaomin Jia
Summary: Lightweight aggregate concrete (LWAC) is widely used in construction engineering due to its light weight, high strength, and durability. However, freeze-thaw cycles can accelerate the degradation of LWAC in cold regions. This study investigates the behavior of BF and PANF reinforced LWAC under freeze-thaw cycles, including compressive peak stress, stress-strain curves, modulus, and toughness. The results show that the addition of BF and PANF enhances peak compressive stress but has a slight effect on brittleness after freeze-thaw cycles. The study also establishes calculation equations for the behavior of fiber-reinforced LWAC.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Yahong Ding, Shuqi Guo, Xianggang Zhang, Meixiang Zhang, Jun Wu
Summary: Basalt fiber can significantly improve the frost resistance of recycled aggregate concrete, affecting the damage appearance and relative dynamic elastic modulus of the specimens.
COMPUTERS AND CONCRETE
(2021)
Article
Construction & Building Technology
Qi Jiang, Wei Liu, Shaopeng Wu, Xuanwen Gou
Summary: This study analyzes the erosion mechanisms of NaCl solution on asphalt concrete and finds that NaCl solution softens asphalt and promotes the intrusion of crystalline salt into it. Salt crystallization alters the surface roughness of aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Additionally, the concentration of NaCl solution initially has no significant impact on the mechanical performance of asphalt concrete, but its domination gradually increases with the intensification of cyclic effects.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Lili Kan, Lan-qing Dai, Ning Kong, Bin Peng, Fei Wang
Summary: This paper investigates the effect of freezing and thawing cycles on the tensile behavior of cracked ultra-high performance concrete (UHPC). The results show that long-term freezing and thawing action deteriorates the cracking strength, tensile strength, tensile strain, and strain energy of cracked UHPC. On the other hand, the action of water generally favors the development of tensile properties of UHPC. The crack distribution tends to be unsaturated under freezing and thawing environment, and the re-hydration reaction is hindered. The pore structure near the crack varies under different environments.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xin Xiao, Jingwei Li, Qingke Meng, Xiangshan Hou, Yanhui Liu, Xujiang Wang, Wenlong Wang, Shengtao Lu, Yuzhong Li, Yanpeng Mao, Tong Li
Summary: Preparing gypsum-based self-leveling mortar (GSLM) using beta-hemihydrate gypsum and solid wastes-derived sulfoaluminate cement (WSAC) can improve the mechanical performance of the mortar, but phosphorus impurities can weaken the hydration speed and degree.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Ferhat Benmahiddine, Fares Bennai, Achraf Charaka, Ameur El Amine Hamami, Abdelkader Tahakourt, Rafik Belarbi
Summary: This paper studied the effects of hysteresis on the hygrothermal behavior at the building scale. Through laboratory validation and numerical simulations, it was found that hysteresis has a significant impact on the relative humidity and total heat fluxes in buildings, while it does not have a noticeable effect on temperature variations.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
You Gao, Wei He, Xiayang Zhang, De'an Sun, Pei Li
Summary: This study determined the boundary line between the swelling and compression deformation zone in lateritic clay through wetting tests, and proposed a simple bimodal SWRC model. It also found that the existing strength model underestimated the tested values in the medium to high suction range, therefore a segmented strength equation was introduced for enhanced predictions of the strength properties of lateritic clay.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, K. M. Mini
Summary: This study investigates the use of encapsulated bacteria to improve the self-healing ability of concrete. Through various tests, it is found that using 20% cement-coated alginate beads (CCAB) and 5% nanosilica (NS) can achieve optimal strength and healing. This research is significant for enhancing the durability of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Shizhe Wang, Haiping Wu, Wen Yang, Wei Wang, Zhibo Zhu, Kun Nie, Luoxin Wang, Hua Wang, Jing Wu
Summary: In this study, photothermal-heat storage concrete (PHSC) was developed with excellent photothermal conversion performance and heat storage capacity. By absorbing and storing solar energy during the day and releasing it at night, PHSC can effectively reduce energy consumption in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Robin Deb, Jialuo He, Geetika Mishra, Yaghoob (Amir) Farnam
Summary: Incorporation techniques of phase change materials in cementitious composites have a significant influence on thermal properties. This study investigated the thermal behavior of low-temperature PCM when subjected to varying temperature change rates and pore confinement inside the porous network of lightweight aggregates. The results showed that ramp rates affect the nucleation and crystallization growth process during the phase transition, and the pore structure of the aggregates affects the supercooling phenomenon and confinement pressure of the PCM.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Eduardo Ferreira, Payam Sotoudeh, Dagmar Svecova
Summary: This study investigates the fatigue behavior of concrete under different stress reversal conditions. The results indicate that stress reversal generally causes more severe damage and reduces the cycles to failure compared to tensile fatigue. Additionally, adding some level of compression contributes to the energy required for failure under stress reversal fatigue. Specimens with higher concentration of fractured aggregates achieve longer fatigue lives.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Mag Raj Gehlot, Sandeep Shrivastava
Summary: This study evaluates the compatibility relationship between plaster bonds and the substrate under an accelerated aging environment, and finds that incorporating an appropriate amount of granite cutting waste can improve the strength parameters and adhesion of the cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Min Zhang, Qirui Luo, Mingke Deng, Shixing Zhao
Summary: This study investigated the bond behavior between carbon FRCM composites with added short fibers and concrete substrates. The effects of different factors were considered and 36 specimens were tested and discussed. The experimental results were analyzed in terms of failure mode, load-slip curve, and characteristic parameters, and the contribution of weft yarns was taken into account in the developed bondslip model.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Dengkai Liu, Hongniao Chen, Ray Kai Leung Su
Summary: The susceptibility of building stones to fire and high temperature was investigated in this study by examining their physical and mechanical properties. The results show that both compressive and tensile properties of stones are affected by temperature changes. The tensile strength is particularly sensitive to temperature changes, requiring special attention to the components subjected to tensile stress in stone buildings. Principal component analysis was used to predict the mechanical properties of stones, providing a new method for calculating the residual mechanical properties after high temperature or fire.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Joso Maria Raposo, Eduardo Cavaco, Luis Costa Neves, Eduardo Julio
Summary: This paper investigates the correlation between the friction coefficient and the surface roughness of concrete-to-concrete interfaces. Experimental tests were performed on specimens with different surface treatments, and the surface roughness parameters were analyzed and correlated with the shear strength and friction coefficient. The results showed that certain roughness parameters had a strong positive correlation with the friction coefficient, while others had little or no correlation. A novel combined roughness parameter with optimized correlation was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Chiara Riccardi, Massimo Losa
Summary: The interest in using bio materials in asphalt pavements is growing due to economic reasons and environmental benefits. This study aimed to review the use of bio extenders as additives in binders, with a focus on replacements greater than 20% of fossil binder. The properties of bio-extended binders were found to vary substantially depending on the biomass source and production process.
CONSTRUCTION AND BUILDING MATERIALS
(2024)