Article
Materials Science, Multidisciplinary
Runqing Liu, Yuanquan Yang, Xingke Zhao, Bo Pang
Summary: This study provides new insights into the impacts of diatomite waste particle sizes on the hydration properties of Portland cement through quantitative analysis using Rietveld refinements method. The results show that smaller diatomite waste particles lead to significant enhancement of cement hydration during the acceleration period, affecting the formation of ettringite and calcium hydroxide. The particle sizes effects of the diatomite waste play a crucial role in the early stage of Portland cement hydration, with the reactivity of diatomite waste becoming important in the later stage.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Ming -Gin Lee, Yishuo Huang, Yeng-Fong Shih, Wei-Chien Wang, Yung-Chih Wang, You-Xiang Wang, Hsien-Wen Chang
Summary: This study used recycled diatomite to partially replace cement in concrete and conducted various tests to evaluate its properties. The results showed that the amount of replacement diatomite increased water demand and setting time, as well as weight loss and shrinkage rates during freeze-thaw cycles. However, it decreased water absorption and thermal conductivity. In terms of compressive strength, 10% diatomite substitution had higher strength at 28 days, while 20% diatomite substitution had higher strength at 90 days. The findings suggest that blends with 20% waste diatomite from the brewing industry have the most potential in terms of mechanical and thermal insulation performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Construction & Building Technology
Yue Xiao, Zhonghang Li, Qinwei Wang, Jianming Dan, Jinyu Wang
Summary: This paper presents a scientifically accurate method for detecting efflorescence on cement-based decorative mortars after conducting five different efflorescent detection tests, focusing on the influence of diatomite on preventing efflorescence. It was found that an appropriate amount of diatomite could effectively inhibit the efflorescence of decorative mortars. Thermogravimetric and nitrogen adsorption methods were used to explain the mechanism of restraining efflorescence.
MATERIALS AND STRUCTURES
(2021)
Article
Chemistry, Physical
Wiktor Szewczenko, Galyna Kotsay
Summary: The concept of introducing powdered materials with alkaline activity into cement compositions has been proposed, and the use of waste glass as an active additive to Portland cement has been evaluated. Replacing a portion of Portland cement with glass waste can maintain the alkaline activity of the cement composition at a level that meets standard requirements. The effects of mixed alkali in Portland cement in the presence of glass waste were described, showing a reduction in potassium alkaline activity when glass waste is introduced into cement compositions.
Article
Construction & Building Technology
M. S. M. Al-kahtani, Han Zhu, Yasser E. Ibrahim, S. I. Haruna
Summary: The use of bio-based polyurethane improves the durability and mechanical properties of cement mortar. Experimental tests were conducted to investigate the effects of polyurethane binder on flowability, water absorption rate, shrinkage properties, compressive strength, and flexural strength. The results show that the addition of an optimal amount of polyurethane binder enhances the flexural strength of the mortar, but reduces compressive strength. The polyurethane also helps control crack propagation and reduce water absorption capacity of the cement mortar.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Dione Silva, G. Fajardo-San-Miguel, Gilles Escadeillas, Dulce Cruz-Moreno
Summary: The effectiveness of using simple or functionalized silicon nanoparticles for surface treatments in mortar specimens made with ordinary portland cement or sulfate resistant cement was evaluated. The results showed that these treatments can effectively prevent the entry of sulfate solution during the initial stages of exposure.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Charalampos Pavlopoulos, Maria Kelesi, Dimitrios Michopoulos, Konstantina Papadopoulou, Theopisti Lymperopoulou, Agelliki Skaropoulou, Sotirios Tsivilis, Gerasimos Lyberatos
Summary: This study successfully addresses the safe disposal of waste from end of life (EoL) solar PVPs through stabilization in cement mortars, ensuring the environmentally friendly alternative can be secured.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2022)
Article
Construction & Building Technology
Chuanchuan Guo, Ru Wang
Summary: This study investigated the effects of sulphoaluminate cement replacing Portland cement ratio (CRPR) and calcium sulfate to sulphoaluminate cement ratio (CCR) on the performance of the cement. The results showed that the variation of CRPR or CCR influenced the setting time, strength, water absorption, and chloride diffusion of the cement. The competition between aluminate in Portland cement and ye'elimite in sulphoaluminate cement in the hydration process affected the pore structure and hydration of the cementitious system.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Chen Chen, Boming Tang, Xuejuan Cao, Fan Gu, Wei Huang
Summary: This study aimed to enhance the photocatalytic performance of mortar specimens containing TiO2 by preparing optimum N-doped TiO2 and suspensions using both single-factor and orthogonal experimental design. Results showed that the best N-doped TiO2 was prepared with 1% N dosage at 700 degrees C for 5 h, while the optimal suspension was prepared with specific conditions including ultrasonic power, time, sol concentration, and SHMP dosage. Furthermore, the NO decomposition test results indicated that the optimum suspension significantly improved the photocatalytic performance of specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Jiaqi Xu, Elina Ceballos, Jordi Cama, Josep M. Soler
Summary: CO2 geological storage is a potential solution to reduce atmospheric CO2 concentration. The interaction between CO2-rich water, cement, and rock formations can lead to cement and rock alteration and the precipitation of secondary minerals. However, the stability of cement and mafic rocks under acidic conditions has not been thoroughly investigated.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2023)
Review
Construction & Building Technology
Laimara da Silva Barroso, Mariana Gomes Pinto Cherene, Gustavo de Castro Xavier, Afonso Rangel Garcez de Azevedo, Carlos Mauricio Fontes Vieira
Summary: This article reviews previous studies on the use of gypsum residues in cement hydration and as a partial substitute for cement and sand. The chemical composition of gypsum residues and by-products are similar, and their recycling does not change their composition. However, the type of calcium sulfate can affect hydration reactions. When used as a partial replacement for cement, gypsum reduces mechanical resistance, but when used with fly ash, it provides better long-term resistance. The replacement of sand with gypsum decreases apparent density values and compressive strength, but increases flexural strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
S. H. Chu
Summary: Built on the VCD approach, this study aims to assess the sustainability and robustness of mortar mixtures by varying the paste and aggregate phases. The use of sand as a replacement for cementitious paste volume (CPV) effectively reduces cement consumption for improved sustainability. However, decreasing CPV leads to decreased workability, especially when it falls below a certain limit. To address this issue, concurrent paste replacement and sand proportioning methods were proposed for optimal mortar performance with minimal cement content. An experimental program was conducted to investigate the effects of CPV and sand proportioning on sustainability, workability, and strengths, and the optimal values were identified for the design of ULCC. Furthermore, the ULCC mechanism was explained based on particle packing and film thickness theory.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Miguel Angel Sanjuan, Jose Antonio Suarez-Navarro, Cristina Argiz, Marta Barragan, Guillermo Hernaiz, Miriam Cortecero, Pedro Lorca
Summary: The study assesses the impact of the carbonation process on natural radionuclides. The results indicate that the carbonation process does not affect the chemical properties of the mortar and the activity concentrations of the radionuclides are relatively low, with annual effective dose rates equivalent to the natural background level.
Article
Construction & Building Technology
J. Hoppe Filho, C. A. O. Pires, O. D. Leite, M. R. Garcez, M. H. F. Medeiros
Summary: The study found that partially replacing cement with red ceramic waste can give cement a pozzolanic character, and there is potential feasibility in using comminuted red ceramic waste as a pozzolanic mineral addition in portland cement.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Levent Koroglu, Derya Over Kaman, Erhan Ayas
Summary: The study found that heat-treated boron derivative wastes used as replacements for Portland cement significantly affected the strength of mortars due to their particle size distribution. Smaller particle sizes decreased the strength of mortars, while larger particle sizes reduced the strength significantly.
CONSTRUCTION AND BUILDING MATERIALS
(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)