Article
Soil Science
Wanyin Wu, Tan Ke, Xiangjun Zhou, Qingqin Li, Yue Tao, Yurui Zhang, Yuyang Zeng, Jun Cao, Lanzhou Chen
Summary: In this study, the use of native microorganisms to construct biological crusts was found to effectively improve the properties of mine tailing sand and increase the nutrient content, suggesting it as a new method for tailing restoration.
APPLIED SOIL ECOLOGY
(2022)
Article
Construction & Building Technology
Jiwei Cai, Ningwei Lv, Xiangyu Jia, Ruifang Zhang, Gelong Xu, Lixiong Cai, Qing Tian
Summary: The study found that the aggregate gradation significantly influences the performance of permeable brick, with the use of four-grade aggregate leading to a permeable brick with both high permeability and higher strength. The ratio of flexural to compressive strength of permeable ceramic brick is about 0.65, which is obviously higher than that of ordinary pervious concrete.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Linglin Xu, Zixuan Sun, Chaoyu Tang, Ken Yang, Binbin Li, Yan Zhang, Zhenghong Yang, Kai Wu
Summary: The reutilization of lead-zinc tailings in autoclaved concrete can reduce environmental pollution. Na2CO3 is found to be the most effective accelerator for the reaction between lead-zinc tailings and cement, which can shorten the induction period.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Minguo Lin, Geng Chen, Yonghui Chen, Dandan Han, Jie Xu
Summary: Waste clay can be converted into non-sintered building materials using hydrothermal solidification technology, effectively improving resource utilization. The main factors responsible for the improved strength and compactness of the material are the generated calcium silicate hydrate (C-S-H), katoite, and Al-substituted tobermorite filling pores and cementing mineral particles. The synthesis conditions determine the type and quantity of hydrothermal products, affecting the pore size distribution and microstructure, thus exhibiting changes in structural and mechanical properties on the macroscale.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Multidisciplinary Sciences
Theodore M. Present, Maya L. Gomes, Elizabeth J. Trower, Nathan T. Stein, Usha F. Lingappa, John Naviaux, Michael T. Thorpe, Marjorie D. Cantine, Woodward W. Fischer, Andrew H. Knoll, John P. Grotzinger
Summary: The study found that in the Caribbean peritidal carbonate environment, the lithification process of microbial mats is not affected by seawater chemistry. Microbial metabolisms can counteract the favorable effects of seawater chemistry on carbonate mineral saturation and microbialite development.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Min Bai, Guangcheng Long, Fan Wang
Summary: This study investigated the effects of manganese tailing sand (MTS) content on the properties of manganese tailing sand concrete (MTSC). The results show that when the substitution rate of MTS is less than 40%, it is completely feasible to replace river sand (RS) with MTS for concrete preparation without the risk of environmental pollution. Additionally, the incorporation of cement can effectively reduce the leaching risk of hazardous substances in MTSC.
Article
Physics, Multidisciplinary
Matej Dolenec, Sabina Dolenec, Sriram Pradeep Saridhe, Ravi Ramadoss, Katarina Ster, Thirumalini Selvaraj
Summary: This study characterized mortars from Thanjavur Palace in India, revealing variations in the composition of aggregates and binders among different mortars. While most mortars contained a lime binder, some also had kaolinite particles. The deteriorated state of all samples was attributed to the presence of gypsum and halite. Analysis of particle size distribution showed that aggregates needed to be ground for binder dispersion, and natural biomolecules like carbohydrates and proteins were identified in all samples as potential admixtures.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Construction & Building Technology
Khalil Naciri, Issam Aalil, Ali Chaaba
Summary: In this study, an eco-friendly mortar was prepared using gypsum, lime binders, and recycled waste brick. The effect of the amount of lime, gypsum, and brick powder on the mortar properties was investigated. Increasing the percentage of gypsum in the mortar improved the strength properties but resulted in a more porous structure. The replacement of sand by brick powder improved the bond strength and mechanical strength of the mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Vasiliki Pachta, Stavroula Konopisi, Maria Stefanidou
Summary: Brick residues have been historically used in mortars to enhance matrix pozzolanicity, resistance to humidity, and decrease density, as well as to add special hue to structures. The study showed that crushed brick can significantly improve the performance of lime-based mortars, with the 90-day age being more representative.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Crystallography
Anna Stepien
Summary: This paper discusses the use of glass sand in the production of autoclaved bricks. The study aims to analyze the feasibility of using glass sand in autoclaved materials and assess their properties. The porosity of materials plays a crucial role in determining their strength, density, and thermal/acoustic insulation properties.
Article
Construction & Building Technology
Juana Arias-Trujillo, Agustin Matias-Sanchez, Blas Cantero, Susana Lopez-Querol
Summary: The use of ceramic brick waste as a sustainable alternative for stabilizing soils is investigated in this study. The research focuses on using ceramic brick waste aggregates to improve the geotechnical properties of aeolian sand. Experimental results show that the addition of ceramic brick waste aggregates can enhance the overall properties of aeolian sand, improving the coefficient of uniformity and CBR values. The study identifies the optimal replacement percentage and confirms the feasibility and environmental suitability of mechanical stabilization using ceramic brick waste.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Su-Cadirci Tugce Busra, Ince Ceren, Calabria-Holley Juliana, Rajnish Kurchania, J. Ball Richard
Summary: The study highlights the significant impact of brick dust particle size distribution on the water transport kinetics and dewatering time of hydrated lime mortars. This control can help optimize mortar performance and provide an environmentally friendly alternative by utilizing waste brick dust.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
R. Ramirez, B. Ghiassi, P. Pineda, P. B. Lourenco
Summary: This experimental study focused on the hygric performance of brick masonry with a special emphasis on the hydraulic characterization of the brick-mortar interface. The results identified the main hygric features of different materials and demonstrated the impact of curing conditions on mortar properties.
BUILDING AND ENVIRONMENT
(2021)
Article
Engineering, Chemical
Ruberlan Gomes Silva, Jose Maria Silva, Thiago Cesar Souza, Matheus Bianchetti, Lorena Guimaraes, Lucas Reis, Eugenio Oliveira
Summary: This study focuses on producing a high-quality magnetite pellet feed from IOCG industrial copper tailings in northern Brazil. Through a series of processing steps, a saleable magnetite pellet feed with high chemical quality was obtained, while also reducing the amount of tailings produced. Additionally, a non-magnetic rougher tailing with potential applications in the construction industry and as soil remineralizer was generated as a by-product.
MINERALS ENGINEERING
(2021)
Article
Engineering, Environmental
Shuqiong Luo, Yali Ge, Minghui Zhao, Lei Yang, Jun Ren
Summary: The synthesis type and heavy metal content have a significant impact on the performance of microwave hydrothermal synthesis. This study aimed to investigate the influence of microwave reaction time and copper content on the preparation of Cu-substituted tobermorite (Cu-tobermorite).
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
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)