Article
Construction & Building Technology
Wenqiang Ruan, Yihan Ma, Jianguo Liao, Tingting Ma, Yu Zhu, Aiguo Zhou
Summary: This paper investigates the effects of steel slag addition on the strength and water resistance of magnesium phosphate cement (MPC), and proposes a hydration mechanism. The results show that with the addition of steel slag, the strength and water resistance of MPC are significantly enhanced. The steel slag also improves the compactness and stability of the cement.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Yingbin Wang, Yi Hu, Jie Yang, Yan He, Xingyang He, Ying Su, Bohumir Strnadel
Summary: In this study, ultra-fine copper slag (CS) with different fineness was fabricated by wet-grinding method for the first time, and the performance of cement-based materials incorporating ultra-fine CS was assessed. The results showed that ultra-fine CS can improve the mechanical strength of mortars and has good later-age pozzolanic activity, making it a high-quality alternative cementitious material to improve the greenness of cement and concrete products.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Yingbin Wang, Yi Hu, Xingyang He, Ying Su, Bohumir Strnadel, Wenjuan Miao
Summary: This research explores the possibility of using low-activity high alumina ferronickel slag (FS), carbide slag, and hemihydrate phosphogypsum (HG) to create supersulfated cement (SSC). The study investigates the impact of HG dosage and FS fineness on the hydration and compressive strength of SSC-FS. The findings suggest that adjusting HG dosage and FS fineness can lead to high mechanical strength at room temperature.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Runhua Guo, Jin Liu
Summary: This paper investigates the reaction process and hydration product of magnesium phosphate cement containing copper slag, as well as tests the setting time of cement and compressive strength of mortar. The results show that copper slag retards the setting of magnesium phosphate cement and the compressive strength of mortar containing copper slag is close to the control sample.
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
(2023)
Article
Construction & Building Technology
Xiao Huang, Chen Xin, Jiang-shan Li, Ping Wang, Shuai Liao, Chi Sun Poon, Qiang Xue
Summary: Barium slag, a hazardous industrial solid waste formed during the production of barium carbonate, has accumulated over 10 million tons in China and shows promise as an admixture for alkali activated slag (AAS) cement. Incorporating barium slag enhances the mechanical strength of AAS paste, improves pore structure, and reduces Na+ leaching concentration, making it a potential sustainable solution for waste recycling in cement production.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Chendi Min, Ying Shi, Zhixiang Liu
Summary: The study found that using PC-GGBFS as binder resulted in higher strength compared to pure PC. The sulfate in PG facilitated the hydration of GGBFS, increasing hydration products and refining the pore structure. GGBFS showed high potential for application in cemented PG backfill.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Environmental
Mengbo Zhu, Geng Xie, Lang Liu, Ruofan Wang, Shishan Ruan, Pan Yang, Zhiyu Fang
Summary: Through tests on hydration heat and strength, it is found that adding an appropriate amount of granulated blast-furnace slag (GBFS) can significantly improve the strength of modified magnesium slag-based (MMS-based) cemented backfilling material. Compared with the control group, the strength of MMS-based mortar with 5% GBFS added increased by 74.2%, 94.6%, 38.0%, and 24.1% respectively. SEM, XRD, FTIR, and TG-DTG tests showed that adding GBFS can generate more hydration products, form more compact microstructures, and consume Ca(OH)2 more quickly. These results provide important theoretical guidance for the raw material ratio design and field application of MMS-based cemented backfilling paste.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Construction & Building Technology
Yunlong Luo, Xintao Zhou, Zhongqiu Luo, Hongyan Ma, Yu Wei, Qin Liu
Summary: Copper slag, a by-product of copper smelting, is used for the first time as the base component to prepare iron phosphate cement, with the best strength achieved at a CS/ADP ratio of 2.0. The hydration process of IPC is found to be multi-stage, involving various reactions leading to the formation of crystalline phases and achieving hydration equilibrium.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Yaning Kong, Shuhua Liu, Peiming Wang
Summary: With the increase of GBFS content, the highest temperature and final water to binder ratios during microwave curing are slightly reduced. The existence of non-thermal effect of microwave in the composite system is indirectly proved through surface tension test. Compared with steam curing, microwave is easier to promote carbonation, and the reduction of harmful pores is an important factor for improving the compressive strength of mortar prepared with cement-GBFS composite binder.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Jin Yang, Yunning Zhang, Xingyang He, Ying Su, Hongbo Tan, Mengyang Ma, Bohumir Strnadel
Summary: By wet-grinding fly ash and carbide slag, the pozzolanic reactivity and performance of the composite material can be improved. However, excessive addition of carbide slag may decrease the strength due to microstructure degradation.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Peng Cui, Chun-ran Wu, Jie Chen, Fu-ming Luo, Shi-cong Kou
Summary: The study evaluated the mechanical properties and setting time of magnesium oxysulfate cement in the context of three-dimensional printing, showing its suitability for 3D printing. The examination of MOS microstructure revealed small pore diameter and varying total porosity within a certain range.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Xiangguo Li, Qiuyan Fu, Yang Lv, Difei Leng, Dongbing Jiang, Chenhao He, Kai Wu, Jianming Dan
Summary: Magnesium-based cement is a promising green cementitious material, but it faces issues with delayed early compressive strength growth and significant shrinkage. This study found that adding superabsorbent polymer (SAP) into magnesium silicate hydrate cement (MSHC) as an internal curing condition can dramatically enhance early age compressive strength and alleviate autogenous shrinkage.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Han Guo, Yijie Liu, Bowen Tai, Zhaocai Zhang, Yu Zhu
Summary: This study explores the influence of environmental pH value on the properties of hardened sulphoaluminate cement paste. The results show that different pH values significantly affect the compressive strength, hydration products, and electrochemical parameters. An increase in pH value leads to the formation of more continuous connected pores and a decrease in matrix strength.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
Kuisheng Liu, Shanliang Ma, Zengqi Zhang, Fanghui Han
Summary: This study focuses on the contributions of granulated blast-furnace slag with various finenesses to the performance development of magnesium potassium phosphate cement (MKPC). It was found that the addition of slag could increase the setting time and decrease the fluidity of MKPC mortar. The physical contributions of slag to the early performance of MKPC mortar are substantial, while the chemical contributions are relatively small.
Article
Construction & Building Technology
Mai Zhang, Franco Zunino, Lu Yang, Fazhou Wang, Karen Scrivener
Summary: Alkalis have been found to increase the early strength of cementitious materials but have a negative impact on long-term strengths. This paper investigates the influence of alkali addition on white cement properties and proposes a plausible mechanism for the reduction in late strength for the first time. The study shows that alkali addition generally limits the degree of hydration after 1 day, leading to a decrease in internal relative humidity and desaturation of larger pores.
CEMENT AND CONCRETE RESEARCH
(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)