Article
Materials Science, Multidisciplinary
Jadambaa Temuujin, Claus H. Ruescher
Summary: The influences of mechanically activated fly ash on the microstructure and thermal behaviour of atmospheric-cured concrete panels have been evaluated. It was found that milled fly ash-substituted concrete exhibits improved mechanical properties and beneficial pozzolanic reaction under harsh weather conditions.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Environmental
Keiko Sasaki, Shingo Nakama, Quanzhi Tian, Binglin Guo, Mengmeng Wang, Ryoichi Takagi, Tomohiko Takahashi
Summary: This study investigates the immobilization mechanisms of undesirable anionic species released from fly ash blended cement. The dissolution tests reveal the stabilities of several species, with selenite being the only element that excessively elutes under current mixing conditions, posing a potential environmental risk.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Jie Chen, Yizhe Shen, Zhiliang Chen, Congkai Fu, Minjie Li, Tieying Mao, Ruiyang Xu, Xiaoqing Lin, Xiaodong Li, Jianhua Yan
Summary: Mechanical ball-milling is an effective technique to enhance the activity of materials. After modification, an accelerated carbonation technology of municipal solid waste incineration fly ash was proposed. The effects of ball-milling on carbonation efficiency, heavy metals stabilization, and leaching characteristics were investigated.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Construction & Building Technology
Byoungsun Park, Young Cheol Choi
Summary: The effects of Blaine fineness of fly ash and chemical activators on the hydration and physical properties of high-volume fly-ash cement pastes were investigated. Increasing Blaine fineness accelerated hydration and increased compressive strength, while chemical activators increased initial strength but decreased long-term strength.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Wujian Long, Jing Xie, Xuanhan Zhang, Shicong Kou, Feng Xing, Chuang He
Summary: This work proposes a new method to overcome the slow setting and low early strength of cement-based composites with high-volume fly ash (HVFA). The effects of a binary system containing calcined hydrotalcite (CHT) and Na2SO4 (NS) on the early strength, hydration process, pore structure, and microstructural morphology of HVFA composites were investigated. Results showed that the CHT and NS co-doped system exhibited better performance in improving the mechanical properties and porosity of HVFA cement than the CHT or NS single system, due to the accelerated hydration process, increased hydration product content, and refined pore structure. These findings provide guidance for enhancing the early strength of HVFA concrete in practical engineering.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Crystallography
Yongfan Gong, Jianming Yang, Haifeng Sun, Fei Xu
Summary: Fly ash belite cement can enhance the performance of cement by shortening setting time, improving early strength, and enhancing long-term strength. Excessive porosity will reduce the strength of cement, while fly ash belite cement promotes the formation of higher strength cement gel.
Article
Chemistry, Physical
Yu Tu, Jiaxin Zhong, Hao Ding, Han Zhang, Guocheng Lv, Jianmeng Zhang, Xifeng Hou
Summary: A composite photocatalyst, FACs-TiO2, was prepared using a wet mechanical grinding method, in which nano-TiO2 was uniformly loaded on FACs surface. The degradation effect of FACs-TiO2 was comparable to commercial nano-TiO2 and showed promise for cost reduction in practical applications.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Geochemistry & Geophysics
Jadambaa Temuujin, Batmunkh Davaabal, Ulambayar Rentsennorov, Enkhtur Odbaatar, Dashnyam Enkhbayar, Tserendagva Tsend-Ayush, Sunjidmaa Danzandorj, Claus Henning Ruescher, Kenneth J. D. MacKenzie
Summary: This paper presents a comparative study of the properties of alkali-activated geopolymer materials prepared using ball-milled and attrition-milled fly ashes. The results showed that continuous attrition milling increased the surface area and reduced the particle size of the fly ash, resulting in improved compressive strength of the geopolymer paste compared to ball milling.
Article
Construction & Building Technology
Byoungsun Park, Young Cheol Choi
Summary: The study found that there is a correlation between the hydration degree of HVFA cement and pore structure, and as the FA replacement ratio increased, the degree of hydration of cement increased while the degree of reaction of FA decreased. Furthermore, the gel/space ratio of HVFA cement paste showed a strong correlation with compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Tiao Wang, Tetsuya Ishida, Rui Gu, Yao Luan
Summary: This study investigated the pozzolanic reaction and curing temperature-dependence of low-calcium fly ash in cement systems over 2 years. It was found that fly ashes have different reactivities and temperature dependencies even though they have similar material properties. The Al/Si ratio of the C-(A)-S-H gel in fly ash-blended cement paste increases as the Ca/Si ratio decreases.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jingjing Huang, Zhongkun Wang, Dongsheng Li, Gengying Li
Summary: This study investigates the sulfate resistance of high-volume fly ash/cement mortars and finds that the addition of nano-silica and polyvinyl alcohol fibers can effectively enhance the mechanical properties and resistance to sulfate attack.
Article
Chemistry, Physical
Julia Rosales, Manuel Rosales, Jose Luis Diaz-Lopez, Francisco Agrela, Manuel Cabrera
Summary: This study investigates the properties and applicability of lava and volcanic ash generated during the eruption of the Cumbre Vieja volcano. It finds that these volcanic materials can replace clinker and serve as supplementary cementitious materials in cement manufacturing, with the potential to significantly increase pozzolanicity.
Article
Engineering, Chemical
Hui Zhou, Yinghua Chen, Haisheng Li, Ziyin Xu, Haoran Dong, Wenping Wang
Summary: Investigating fly ash triboelectrostatic separation from a microscopic point of view is meaningful. The study proposes ball milling pretreatment to improve the recycling efficiency of unburned carbon in fly ash. The results show that the microscopic characteristics of particles have a significant impact on the separation process, and adjusting voltage and flow velocity can enhance the efficiency of separation.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Construction & Building Technology
S. Divya, R. Saranya, S. Praveenkumar
Summary: The increased consumption of construction materials has led to a global movement towards the use of eco-friendly materials. This study investigates the effects of adding graphene nanoplatelets and rice husk ash on cement. The experiments show that adding graphene nanoplatelets to cement increases its compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Engineering, Environmental
Mitali Nag, Dania Labira, Takayuki Shimaoka, Hirofumi Nakayama, Teppei Komiya
Summary: The aim of this study was to examine the effect of size-fractionated bottom ash (BA) in immobilizing heavy metals in fly ash (FA), in order to enhance the effective utilization of resources. The results showed that both BA fractions significantly immobilized Pb and Zn through carbonation and pozzolanic reactions. This technique can minimize the amount of raw materials required, reduce waste sent to landfills, and create a new material for reuse.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(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)