Article
Thermodynamics
Nordine Leklou, Shaswat Kumar Das
Summary: This work investigated the effect of curing temperature on metakaolin-cement mortar blend. Mortar mixtures with different substitution rates of metakaolin at four different constant curing temperatures were studied. Isothermal calorimetry and compressive strength tests were performed and the results showed that higher curing temperatures accelerated the hydration rate and earlier appearance of the main peak of hydration. The increase in metakaolin dosage improved the reactivity of the binder at all temperatures considered.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Construction & Building Technology
Renggugang Liu, Yijin Zeng, Shiming Zhou, Peiqing Lu, Kui Liu
Summary: The compressive strengths and hydration products of oil well cement mixed with fly ash at ultra-high temperatures were investigated. The results showed that the samples with 70% fly ash had a continuous increase in strength at 150 degrees C and met the cementing requirements, while the samples with 30% fly ash had the lowest compressive strength at 220 degrees C.
JOURNAL OF ADVANCED CONCRETE TECHNOLOGY
(2022)
Article
Construction & Building Technology
Sajjad Mozaffari, Omeid Rahmani, Ali Piroozian, Zaman Ziabakhsh-Ganji, Hossein Mostafavi
Summary: Inadequate early compressive strength is a common problem when using lightweight cement (LWC) slurries in low-temperature conditions. The Research Institute of Petroleum Industry (RIPI) investigated a new formulation of LWC slurry to improve its compressive strength and hydration rate. The results showed that incorporating lightweight additives in the RIPI-LWC formulation enhanced the compressive strength and reduced curing time. Furthermore, the hydraulic bonding of the cement slurry was improved by the addition of a thixotropic additive, preventing gas migration.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Miaomiao Wang, Qing Liu, Xiaoxu Liang, Jianyu Xu, Zongjin Li, Rui Liang, Guoxing Sun
Summary: This paper investigates the effect of metakaolin on the performance of high water-to-solid ratio magnesium potassium phosphate cement (MKPC). The presence of metakaolin improves the compressive strength of MKPC and reduces chloride diffusion, but decreases the fluidity of MKPC slurry.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Bao Lu, Zhen Huo, Qingyuan Xu, Guihua Hou, Xiaosan Wang, Jianhui Liu, Xiang Hu
Summary: This paper investigated the characteristics of synthesized calcium silicate hydrate (CSH) during the carbonation process and the effects of CSH and carbonated C-S-H (CCSH) seeds on the performance of cement pastes. The result showed that CCSH is composed of 68.4% calcite and 31.6% silica gel and can absorb 301 g CO2 per kg C-S-H. The addition of CCSH significantly improved the cement hydration and led to a denser pore structure due to the higher surface area and the generated calcite and silica gel.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Kaiqiang Liu, Junjie Yu, Yang Xia, Haiping Wang, Dekun Wang, Jiang Du, Yongding Tian, Xingguo Zhang
Summary: This study investigated the hydration kinetics and microstructure of oil-well cement slurry in the early hydration stage. It revealed the hydrostatic pressure reduction mechanism and the quantitative relationship between the hydration kinetics and hydrostatic pressure. The results showed that the hydrostatic pressure of the cement slurry changed according to the Arrhenius equation. The microstructure of the slurry developed from suspension particles to a particles framework bonded to external interfaces. The hydration products strengthened the framework and decreased the porosity, pore size, and connectivity of the slurry, leading to the loss of hydrostatic pressure. Hydration kinetics indicated that the hydrostatic pressure changed linearly with hydration heat increments. A prediction method using hydration heat increments was developed to successfully predict the hydrostatic pressure of oil-well cement slurry.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Gang Wang, Hua Tan, Chunjing Lu, Ao Sun
Summary: SiO2@PEGMA composites were synthesized by grafting poly(ethylene glycol) methacrylate (PEGMA) on SiO2 nanoparticles. The composites exhibited excellent dispersion stability and filling effect, promoting hydration reaction and enhancing the compressive strength of cement samples.
Article
Construction & Building Technology
Yunshi Pan, Yaowen Zhang, Shuangxin Li
Summary: The study explores the combined application of microwaving curing and RPC, finding that isothermal microwave curing can effectively improve the mechanical properties of concrete and is more energy efficient and easier to control compared to nonisothermal curing.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Priscillia Laniesse, Celine Cau Dit Coumes, Gwenn Le Saout, Adel Mesbah
Summary: This study investigated the effects of boron and aluminum on the mixing solution of wollastonite-based brushite cement. It found that boron slows down setting and reduces heat release, but results in poor compressive strength, while aluminum improves mechanical properties but can cause rapid setting. A joint addition of boron and aluminum optimizes the material properties in fresh and hardened states.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Ziyan Wang, Zhonghe Shui, Tao Sun, Xiaosheng Li, Mingzhong Zhang
Summary: This paper investigates the effect of metakaolin on early hydration, phase assemblages, and mechanical properties of excess-sulphate phosphogypsum cementitious materials. It is found that metakaolin can shorten the setting time and increase the compressive strength. When the dosage of metakaolin is below 20%, there is an increase in ettringite and highly disordered C-(A)-S-H gel, leading to a significant increase in compressive strength. However, exceeding 20% metakaolin dosage reduces the hydration degree at the late stage.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Wei Li, Liangmao Hua, Yulei Shi, Penggang Wang, Zhicheng Liu, Dongbo Cui, Xiaoguang Sun
Summary: The incorporation of metakaolin into cementitious materials can enhance the compressive strength and durability of cement paste. The study reveals the influence of metakaolin on fluidity, setting time, compressive strength, conductivity, microstructure, and hydration behavior of cement paste. The results indicate that metakaolin affects the fresh cement paste by lowering fluidity and delaying setting times. It also hinders the ion dissolution from the cement-metakaolin mixture. The addition of metakaolin improves compressive strength and refines the pore structure. It also promotes the formation of hydration products and reduces the calcium hydroxide content. The microstructure of the cement paste becomes denser with the increase of metakaolin.
APPLIED CLAY SCIENCE
(2022)
Article
Construction & Building Technology
Kaiwang Xue, Chaojun Wan, Yaowen Xu, Yuping Jiang, Yuqi Cheng
Summary: This study investigated the effect of pre-hydration age on the phase composition, microstructure, and strength development of CO2 cured cement mortars. The results showed that CO2 curing accelerated the reaction of clinker phases, particularly in the early stages. Additionally, CO2 curing promoted the formation of CaCO3, specifically in decomposition mode II. The content of decomposition mode I and the total content of CaCO3 increased with pre-hydration duration. Calcite was the main crystalline phase observed, with no aragonite found. Compared to the reference group, the pore structure parameters and pore connectivity of cement mortars with pre-hydration were improved, especially in the sample pre-hydrated for 6 hours. Moreover, the compressive strength was significantly increased, particularly in the early stages. However, the 28-day compressive strength did not continuously increase with the duration of pre-hydration.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Jian Zhang, Changning Wang, Zhigang Peng
Summary: In this study, a new type of soap-free inorganic/organic composite latex (SBML-II) was prepared and its properties were characterized. The SBML-II showed better dispersibility, stability, and thermal stability compared to conventional latex (SBML-I). Furthermore, the SBML-II exhibited good dilution effect on cement slurry, improved mechanical properties of the cement matrix, and enhanced microstructure formation.
ADVANCES IN CEMENT RESEARCH
(2021)
Article
Construction & Building Technology
Sarra Drissi, Caijun Shi, Ning Li, Yiwei Liu, Jianhui Liu, Pingping He
Summary: This study elucidates the enhancement and acceleration of cement hydration kinetics by LS and MK, but the high reactivity of MK leads to higher porosity at early age, hindering its effectiveness as a filler. The correlation between the optimum mix design and compressive strength was found to be dependent on the paste age, contributing to a better understanding of the properties of the PC-MKLS ternary system.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Yan Xia, Minghao Liu, Yading Zhao, Xiaobing Ma
Summary: This study investigates the effect of Na2SO4 on the hydration and microstructure of Portland cement blended with a high dosage of sewage sludge ash (SSA). The addition of Na2SO4 significantly improves the compressive strength of the blended systems and enhances the microstructure. Na2SO4 also promotes the formation and growth of AFt crystals in the blended systems.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Multidisciplinary
Jiapei Du, Yuhuan Bu, Zhonghou Shen, Xianhai Hou, Chengxing Huang
MATERIALS & DESIGN
(2016)
Article
Chemistry, Multidisciplinary
Yuhuan Bu, Zhiyang Chang, Jiapei Du, Dongming Liu
Article
Chemistry, Multidisciplinary
Jiapei Du, Yuhuan Bu, Shenglai Guo, Leiju Tian, Zhonghou Shen
Article
Construction & Building Technology
Yuhuan Bu, Xianhai Hou, Chunyu Wang, Jiapei Du
CONSTRUCTION AND BUILDING MATERIALS
(2018)
Article
Construction & Building Technology
Jiapei Du, Yuhuan Bu, Zhonghou Shen
CONSTRUCTION AND BUILDING MATERIALS
(2018)
Article
Construction & Building Technology
Du Jiapei, Bu Yuhuan, Shen Zhonghou, Cao Xuechao
CONSTRUCTION AND BUILDING MATERIALS
(2019)
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)
