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
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
Environmental Sciences
Shiquan Wang, Xingxing He, Shunmei Gong, Guanghua Cai, Lei Lang, Hongrui Ma, Zhiyong Niu, Fangming Zhou
Summary: Cement solidification is a widely used method for treating dredged sludge, but the presence of organic matter in the sludge limits its application. The addition of fulic acid (FA) changes the physical properties and hydration reactions of the sludge, resulting in a decrease in the strength of cement-solidified dredged sludge (CDS). FA hinders the conversion of pore water to combined water and weakens the internal bond within CDS by hindering the development of C-S-H gel. The amount of hydrates in CDS containing FA also decreases. The weakening mechanism of FA on the strength of CDS can be attributed to the adsorption of FA on cement minerals, the reduction of pH in the pore liquid, and the adsorption of calcium ions by carboxyl and hydroxyl functional groups of FA.
Article
Construction & Building Technology
Ting Zhang, Zhenping Sun, Haijing Yang, Yanliang Ji, Zhuhua Yan
Summary: The study found that adding TIPA can improve the hydration of cement and the pozzolanic reaction of CBP, thereby improving the compressive strength of the mixture. In addition, adopting the cementCBP-TIPA binding system can save a significant amount of energy consumption and reduce carbon footprint.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Yupeng Cao, Jing Zhang, Zengfeng Zhao, Junxia Liu, Hui Lin
Summary: This study investigates the effect of organic matter content and curing temperature on the development of strength in cement-solidified dredged sludge (CSC). The results show that increasing organic matter content decreases the compressive strength of CSC. However, increasing the curing temperature has little effect on the strength growth rate. Higher curing temperature can enhance the early strength growth rate and shorten the curing age for CSC containing organic matter.
Article
Construction & Building Technology
Lucas Henrique Pereira Silva, Jacqueline Roberta Tamashiro, Fabio Friol Guedes de Paiva, Luis Fernando dos Santos, Silvio Rainho Teixeira, Angela Kinoshita, Patricia Alexandra Antunes
Summary: The study found that using bamboo leaf ash as a partial replacement for cement in mortar production can achieve certain economic benefits and mitigate environmental impacts, with the compressive strength meeting standard requirements. Bamboo leaf ash has the potential to be used as a partial substitute for cement, offering good cost-benefit and eco-efficiency based on life cycle analysis (LCA).
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Seongwoo Gwon, Young Cheol Choi, Myoungsu Shin
Summary: This study investigated the hydration characteristics of cement composites incorporating plant cellulose microfibers (CMFs) as a sustainable additive. The findings suggest that a higher amount of CMFs generally leads to a larger delay in the setting time and lower compressive strength, but mixtures with 0.3-0.6% CMFs showed reasonably high strengths compared to plain mixtures. The CMFs refined the pore structures of the cement composites and promoted further hydration.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Vineet Shah, Allan Scott
Summary: This study investigates the applicability of using recovered silica from olivine as supplementary cementitious material. The results show that the recovered silica provides both filler and pozzolanic effect from an early age and achieves comparable or better compressive strength than ordinary cement at all replacement levels and ages. This suggests that the recovered silica from olivine can improve binder properties and have significant environmental benefits.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
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
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
Chemistry, Physical
Ina Pundiene, Jolanta Pranckeviciene, Modestas Kligys, Giedrius Girskas
Summary: This study analyzes the influence of waste-metal particle filler on Portland cement paste and mortars with pozzolanic additives. The results show that waste-metal particle fillers prolong the hydration process and the addition of pozzolanic additives can improve the physical-mechanical properties such as compressive strength.
Article
Construction & Building Technology
Fabricio Lima Barbosa, Guilherme Chagas Cordeiro
Summary: The study aimed to investigate the influence of sugar cane bagasse ash (SCBA) with different chemical and mineralogical compositions on the hydration-related properties of pastes and compressive strength and autogenous shrinkage of mortars. The results showed that SCBA samples with high silica-rich amorphous levels, fewer contaminants and high specific surface area behaved like reactive rice husk ash (RHA) with pronounced physical effects on hydration. SCBA-blended mortars caused a rise in compressive strength, but only the most pozzolanic SCBA mortar was comparable to that with RHA. Additionally, all mixes with additions presented higher autogenous deformation than that of reference mortar, showing the importance of increasing ash pozzolanicity and refining the mortar pore structure in reducing mortar autogenous shrinkage.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Zhiyang Chang, Guangcheng Long, Youjun Xie, John L. Zhou
Summary: The influence of calcination on the characteristics and pozzolanic activity of aluminum-rich sludge ash was investigated, as well as its effect on cement hydration. Results showed that calcination at 800℃ yielded sludge ash with higher pozzolanic activity and better strength development, but the high dissolved aluminum concentration inhibited cement hydration.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Adnan Khan, Muhammad Ali Sikandar, Muhammad Tariq Bashir, Syed Azmat Ali Shah, Bakht Zamin, Khalid Rehman
Summary: This study investigates the use of tobacco stem ash (TSA) as a partial replacement for Portland cement (PC) and its effects on the properties of cement pastes and mortars. The results show that TSA can enhance the water absorption, compressive strength, ultrasonic pulse velocity, and electrical resistivity of mortars, as well as promote the hydration reaction and formation of cement hydrates.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Jinfeng Sun, Haina Dong, Jiajun Wu, Jingjing Jiang, Weifeng Li, Xiaodong Shen, Guihua Hou
Summary: In this study, the effects of synthetic calcium silicate hydrates/polycarboxylate nanocomposites on the hydration behaviour of Portland cement and metakaolin mixtures were investigated. The results showed that an optimal content of 3% CPNs led to the highest compressive strength and improved workability of the mortars. Additionally, the CPNs accelerated cement hydration and promoted the pozzolanic reaction of metakaolin with calcium hydrate, resulting in denser microstructures and enhanced compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Mohammed Nouali, Zohra Derriche, Elhem Ghorbel, Chuanqiang Li
ROAD MATERIALS AND PAVEMENT DESIGN
(2020)
Article
Construction & Building Technology
Elhem Ghorbel, George Wardeh, Hector Gomart, Pierre Matar
JOURNAL OF BUILDING PHYSICS
(2020)
Article
Construction & Building Technology
Mohammed Nouali, Elhem Ghorbel, Zohra Derriche
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Construction & Building Technology
Abdelaziz Hasnaoui, Elhem Ghorbel, George Wardeh
Summary: The study evaluates the performance of GBFS and MK-based geopolymer concrete under different curing conditions. It was found that curing at 90% RH reduces water porosity and shrinkage in GC, and enhances its mechanical performance. The European standard can be used to predict compressive strength and shrinkage development in GC, and the use of GBFS/MK mixture overcomes mechanical performance degradation in water-cured GC.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Mohammed Nouali, Zohra Derriche, Elhem Ghorbel
Summary: This study investigates the effects of adding a small quantity of used engine oil to waste plastic-modified bitumen, aiming to enhance the plastic content in bitumen and improve mechanical properties while enhancing aging resistance and reducing low temperature cracking resistance. The results indicate that the addition of used engine oil allows for greater incorporation of plastic into bitumen, resulting in improved mechanical properties for both waste plastic-modified bitumen and used engine oil plastic-modified bitumen.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Chemistry, Physical
Elhem Ghorbel, Mariem Limaiem, George Wardeh
Summary: This research investigates the effectiveness of bio-sourced flax fiber-reinforced polymer compared to traditional carbon fiber-reinforced epoxy polymer for confining recycled aggregates concrete. Experimental results show that bio-sourced composites are efficient in strengthening recycled aggregates concrete, especially air-entrained concrete. Additionally, the compressive strength and strain enhancement from FRP confinement are minimally affected by the replacement ratio.
Article
Chemistry, Multidisciplinary
Mohamed Aziz Chikouche
Summary: This article proposes a solution to two environmental problems by replacing cement with treated dredged sludge in ordinary concrete, which helps minimize siltation and improve cement utilization.
ANNALES DE CHIMIE-SCIENCE DES MATERIAUX
(2021)
Article
Chemistry, Multidisciplinary
Riad Ali Halassa, Mekki Bibi, Mohamed-Aziz Chikouche
Summary: This study aims to utilize green materials from silt in dams to mitigate the harmful impacts of siltation on Algerian dams affected by climate change-induced droughts and irregular rainfalls. By treating the sludge dredged from the K'sob dam and incorporating it into cement, a hybrid binder was created for cementitious materials, resulting in high strength, cost-effectiveness, and positive ecological impact. The promising test results suggest optimal utilization of sludge from similar dam areas.
ANNALES DE CHIMIE-SCIENCE DES MATERIAUX
(2021)
Article
Chemistry, Multidisciplinary
Laid Baali, Larbi Belagraa, Mohamed Aziz Chikouche, Leila Zeghichi
Summary: This study focuses on utilizing plastic waste fibers to enhance the properties of self-compacting concrete, with a focus on rheological and mechanical improvements. By adding plastic fibers at different percentages, the study evaluates the effects on the SCC's properties, showing significant benefits in rheological and mechanical performance compared to normal SCC concrete.
ANNALES DE CHIMIE-SCIENCE DES MATERIAUX
(2021)
Article
Construction & Building Technology
Abdelaziz Hasnaoui, Elhem Ghorbel, George Wardeh
Summary: This paper investigated the potential use of recycled demolition aggregates in geopolymer concrete manufacturing, finding that introducing pre-saturated RA does not affect workability but decreases compressive strength.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Engineering, Civil
Elhem Ghorbel, George Wardeh, Belen Gonzalez-Fonteboa
Summary: This study examines the impact of using 10% of recycled sand in mortars. The research finds that the addition of recycled sand results in increased air content, yield stress, and viscosity in fresh mortars. It also shows that mortars with recycled sand experience a faster rate of flow loss over time. However, there is no significant difference between regular sand and recycled sand in terms of hydration heat and setting time in the hardening state. The study further reveals that the air content in mortars is influenced by the fineness of the sand and the presence of fines with a diameter less than 63 micrometers.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Engineering, Civil
Ismail Bello, George Wardeh, Belen Gonzalez-Fonteboa, Fernando Martinez-Abella, Elhem Ghorbel
Summary: Accurately measuring the compressive strengths and stress-strain relationship of brick and mortar is crucial for studying and evaluating masonry structures. A non-contact measuring technique was used in this study to obtain full-scale strain and failure patterns, and investigate the effect of joint mortar composition on masonry behavior.
Article
Materials Science, Multidisciplinary
Rana Al Ali, Mohamed Dallel, Elhem Ghorbel, Boumediene Nedjar
Summary: In this study, Digital Image Correlation (DIC) was used to characterize the creep behavior of a plain-woven cotton fabric over a long period of time (32 days). The results were compared with two models and showed good agreement with a viscous law following the Norton-Hoff-like power law. The viscous parameters of the material were determined by fitting the experimental results with a numerical scheme, while the time-independent parameters were found using static testing apparatus. This study provides insights into the creep behavior of textiles and enables the prediction of their long-term stress behavior through modeling tools.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Construction & Building Technology
Pablo Pena Torres, Elhem Ghorbel, George Wardeh
Summary: Experimental and predicted values showed significant dispersion for both natural aggregates concrete (NAC) and recycled aggregates concrete (RAC). In order to address this dispersion, a new analytical model was developed for NAC which identified parameters such as conventional creep coefficient, power of ageing function (alpha), and relative humidity/compressive strength factor (beta(h)) through inverse analysis. The study found the power of ageing function to be 0.44 instead of the fixed value of 0.3 in Eurocode 2 (EC2), and proposed new expressions for phi(0) and beta(h) considering the presence of recycled aggregates through equivalent replacement ratio.
Article
Construction & Building Technology
Jad Bawab, Jamal Khatib, Ali Jahami, Adel Elkordi, Elhem Ghorbel
Summary: The study showed that adding CRT glass waste to concrete can increase compressive strength, flexural strength, and modulus of elasticity, especially at the 10% replacement level. The load carrying capacity of reinforced concrete beams is higher when 10% of sand is replaced with CRT glass. The failure mode of the beams is flexural failure, and the strain distribution showed better ductility in the control beam.
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)
