Article
Construction & Building Technology
Qiang Ren, Yaxin Tao, Dengwu Jiao, Geert De Schutter, Zhengwu Jiang
Summary: This study predicts the rheological properties of concrete with irregular aggregate using a multi-level biphase assumption. The proposed models demonstrate power-law relationships between relative viscosity, relative yield stress, and relative thickness of suspending media. The accuracy and robustness of the models are proven for mixtures with various particle shapes and size distributions of manufactured sand and coarse aggregate. The predicted influences of particle shapes on the rheological properties can be represented by their effects on relative paste film thickness and relative mortar film thickness. The proposed multi-level prediction lays the foundation for mix proportioning of concrete with irregular aggregate based on specified rheological requirements.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Multidisciplinary Sciences
Anjali G. Pillai, Madhavi Latha Gali
Summary: Translational sliding failures in landfills can be triggered by inadequate shear strength of liners and covers interfaces. Geosynthetic Clay Liners (GCLs) are commonly used to contain leachate in landfills and are placed on compacted sand subgrades to increase shear resistance. This study investigates the feasibility of using manufactured sand (Msand) instead of natural sand in landfill construction. The results show that Msand provides higher interface shear strength with GCL compared to river sand due to their differences in particle morphology. The study highlights the potential benefits of using Msand as a replacement for natural sand.
SCIENTIFIC REPORTS
(2023)
Article
Construction & Building Technology
Wenting Mao, Chunpeng Cao, Xincheng Li, Jueshi Qian, Chao You
Summary: Manufactured limestone sand was used as a replacement for quartz sand to produce MAPC mortar, resulting in negative effects on the mortar's performance. However, the use of a defoaming formula containing polyether modified silicone (PMS) defoamer and mineral admixtures Portland cement and silica fume effectively reduced expansion and improved other properties of the mortar. The defoamed MAPC mortar showed improvements in compressive strength, interfacial bonding strength, water-tight performance, and resistance to chloride penetration.
Article
Construction & Building Technology
Branavan Arulmoly, Chaminda Konthesingha, Anura Nanayakkara
Summary: This study investigates the properties of cement-sand mortar with manufactured sand and offshore sand as alternatives to river sand. Different binder-to-aggregate ratios and replacement levels were considered, revealing improved density, workability, and strength at certain replacement levels.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Yuan Jiang, Bo Li, Shu Liu, Jun He, Alvaro Garcia Hernandez
Summary: This study investigates the properties of cement mortar with recycled concrete powder (RCP) as sand replacement. The results show that incorporating a proper amount of RCP can enhance the sustainability of mortars without compromising their mechanical properties. When the replacement ratio reaches a certain range, there is almost no or a slightly positive impact on the mechanical properties of mortars.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Liu Tong, Zhu Lihua, Yu Bentian, Li Tong
Summary: Stone powder and other waste powder have a negative impact on the environment, society, ecosystem, and human well-being, but using them in concrete can be a green and effective solution.
JOURNAL OF ADVANCED CONCRETE TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Weiguo Shen, Jiale Wu, Xuejian Du, Zhitang Li, Dinglve Wu, Jiangtao Sun, Zhongwen Wang, Xujia Huo, Deqiang Zhao
Summary: This paper presents a case study on the cleaner production of digital control manufactured sand (DMS) and the ecological utilization of recycled stone powder (SP) in a highway project. The study demonstrates that DMS production system can produce high-quality sand while reducing environmental pollution. The application of DMS in concrete shows improved working performance and strength compared to ordinary manufactured sand. The use of recycled SP also contributes to zero discharge of solid waste, leading to significant economic and ecological benefits.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Yue Li, Yunze Liu, Caiyun Jin, Jinlei Mu, Hongwen Li, Jianglin Liu
Summary: This study investigated the long-term creep properties of river sand concrete and manufactured sand concrete, focusing on the effect of the interfacial transition zone (ITZ) around the aggregate. The results showed that the properties of the ITZ significantly influenced the creep modulus of the concrete. By considering different ITZ cases, the prediction accuracy of the long-term creep of concrete could be improved.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
Tao Fu, Jun-lin Liang, Yi-fu Lan, Yi-peng Xiao, Jian-hui Wei
Summary: This study investigated the effect of stone powder content on the basic mechanical properties of mechanism sand concrete in a region of Guangxi. The results showed that the increase in stone powder content had an impact on the slump, expansion, compressive strength, and splitting tensile strength of the concrete. The maximum slump and expansibility were observed when the stone powder content reached 9%. The maximum compressive strength and splitting tensile strength were observed at a stone powder content of 12%.
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Zhao Han, Yunsheng Zhang, Wenhua Zhang, Hongxia Qiao, Qiong Feng, Cuizhen Xue, Minggang Shang
Summary: In this study, CT scanning technology was employed to reconstruct the real three-dimensional morphology of sand particles and accurately calculate their morphological parameters. The comprehensive morphological parameters of manufactured sand samples were obtained using the entropy method. A rheological model considering these comprehensive morphological parameters was established to predict the flowability of manufactured sand mortar more accurately.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Sunbo Zheng, Jiajian Chen, Wenxue Wang
Summary: Manufactured sand is an effective solution to the shortage of natural sand in the construction industry. This study investigates the influence of high fines content on the durability of high-strength manufactured sand concrete using granite and limestone manufactured sand, and analyzes the mechanism behind it through macro and micro tests. The findings indicate that the carbonation depth of manufactured sand concrete is minimized when the fines content is 10%. Additionally, a fines content of less than 15% effectively improves the chloride and sulfate impermeability of the concrete. It is observed through tests that the filling effect of fines is the primary reason for improving concrete durability, while excessive fines hinder cement hydration and adversely affect durability. Therefore, the fines content of high-strength manufactured sand concrete should be controlled within the range of 5% to 15%, with the optimal durability achieved at a fines content of 10%.
Article
Engineering, Civil
Nasrin Vafaei, Kazem Fakharian, Abouzar Sadrekarimi
Summary: Sand-steel interface behavior differs from sand-sand interface behavior, with sand density having a significant effect on interface shear behavior. Sand-steel interfaces are less dilative and exhibit smaller critical shearing displacements compared to sand-sand interfaces, with sliding displacement prevailing at higher sand densities. Interface friction angle is influenced by inter-particle shear resistance, particle crushing, and particle rearrangement/rotation mechanisms.
TRANSPORTATION GEOTECHNICS
(2021)
Article
Construction & Building Technology
Jinlei Mu, Yue Li, Hui Lin, Yunze Liu, Xiao Luo
Summary: The excessive extraction and utilization of river sand may lead to the destruction of river eco-systems. Using manufactured sand as a substitute for river sand can effectively avoid this issue and improve mortar strength. This study investigated the influence of lithological characteristics of three types of manufactured sand on mortar strength and explained the core causes of strength variation influenced by different parent rocks.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Wenting Mao, Chunpeng Cao, Xincheng Li, Jueshi Qian, Yudong Dang
Summary: This study investigated the use of limestone sands as an alternative to quartz sands in the preparation of MAPC mortar. It was found that an increased content of limestone fines resulted in a decrease in the mechanical strength of the MAPC mortar. Effective defoaming techniques were identified as crucial for the utilization of limestone sands in high-performance MAPC mortar preparation.
Article
Engineering, Marine
Zhe Wang, Guanyu Chen, Dazhi Wu, Yao Li, Juntao Hu
Summary: The particle shapes of manufactured sand (MS) and natural quartz sand (QS) were quantitatively characterized, and their liquefaction and shear behaviors were evaluated through direct shear tests, cyclic simple shear tests (CSS), and post-liquefaction monotonic shear tests (PMS). The study found that samples with irregular particles exhibited stronger liquefaction and shear resistances, indicating the stability of MS under cyclic shear loadings. Moreover, the research proposed quantitative relationships between particle shape, shear history, and shear and liquefaction behaviors, providing guidance for the application and design of MS in offshore and foundation engineering.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Construction & Building Technology
Qiang Ren, Zhengwu Jiang, Haoxin Li, Xinping Zhu, Qing Chen
CONSTRUCTION AND BUILDING MATERIALS
(2019)
Article
Construction & Building Technology
Xiaojie Yang, Jiasen Liu, Haoxin Li, Linglin Xu, Qiang Ren, Lin Li
CONSTRUCTION AND BUILDING MATERIALS
(2019)
Article
Energy & Fuels
Haoxin Li, Hui Zhang, Lin Li, Qiang Ren, Xiaojie Yang, Zhengwu Jiang, Zhenlei Zhang
Article
Green & Sustainable Science & Technology
Qiang Ren, Zhiyong Zeng, Zhengwu Jiang, Haoxin Li
JOURNAL OF CLEANER PRODUCTION
(2020)
Article
Construction & Building Technology
Xiaojie Yang, Jiasen Liu, Haoxin Li, Qiang Ren
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Construction & Building Technology
Qiang Ren, Zhiyong Zeng, Mingjun Xie, Zhengwu Jiang
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Review
Construction & Building Technology
Zhengwu Jiang, Bei He, Xinping Zhu, Qiang Ren, Yi Zhang
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Construction & Building Technology
Qiang Ren, Luchuan Ding, Xiaodi Dai, Zhengwu Jiang, Geert De Schutter
Summary: A method based on ensemble classification and regression tree was proposed to predict the compressive strength of manufactured sand concrete, showing superiority in accuracy and robustness. Age was identified as the most significant factor influencing the compressive strength, with stone powder content contributing approximately 25% to the age.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Xiaodi Dai, Serdar Aydin, Mert Yucel Yardimci, R. E. N. Qiang, Karel Lesage, Geert De Schutter
Summary: The study investigates the effects of limestone powder on various aspects of alkali-activated cements, including rheological behavior, pore solution chemistry, mechanical properties, and microstructure. It was found that limestone powder enhances the structural build-up and reaction rate of the mixtures. However, the inert character of limestone powder leads to a decrease in compressive strength of the ternary mixtures.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Chemistry, Physical
Jingliang Xia, Changwei Cao, Zhengwu Jiang, Qiang Ren, Ying Zhang, Jing Wang, Faguang Leng
Summary: This paper investigates the properties of white high-strength concrete prepared with ground limestone powder. The study shows that the whiteness of the concrete is significantly improved by the addition of limestone powder, while the water-binder ratio has a great influence on the slump and compressive strength of the concrete. The optimal mix proportion is determined through multi-objective optimization.
Article
Construction & Building Technology
Hongen Zhang, Prabir Kumar Sarker, Li Xiao, Jinhua Ai, Bei He, Qiang Ren, Xinping Zhu, Yi Zhang
Summary: The influence of water content and freeze-thaw medium on the durability of low-carbon geopolymer mortar (LCGM) subjected to cryogenic attack was evaluated. The results showed that water-saturated LCGMs in air freeze-thaw medium experienced a mass loss, while other specimens exhibited different degrees of mass increase. The compressive strength of water-saturated LCGMs decreased while the others slightly increased in air freeze-thaw medium. LCGMs exhibited a significant decrease in compressive strength in water freeze-thaw medium.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Jiahao Li, Yiqun Guo, Tongsheng Zhang, Peng Gao, Juan Wu, Qiang Ren, Jiangxiong Wei, Qijun Yu
Summary: In this study, a database containing over 500,000 aggregate particle size distributions (PSDs) and their corresponding packing density and specific surface area was established using the Compressible Packing Model (CPM) and photogrammetric 3D reconstruction. The effects of aggregate volume proportion and surface area on the mechanical properties and chloride diffusivity of concrete were evaluated by individually controlling target volume proportion or surface area of aggregate. An empirical equation considering the aggregate size-dependent interfacial transition zone thickness and tortuosity was proposed to describe the relationship between chloride diffusion coefficient and aggregate proportion and surface area. A strategy for aggregate PSD optimization was provided to enhance the chloride resistance of concrete.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Xiaodi Dai, Qiang Ren, Serdar Aydin, Mert Yucel Yardimci, Geert De Schutter
Summary: This paper explores the potential of accelerating the slow early reaction process of sodium carbonate-activated slag mixtures by adding a small amount of sodium hydroxide or sodium silicate to the activator. The reaction process was evaluated using isothermal calorimetry and ultrasonic wave technology. Results showed that the addition of sodium hydroxide or sodium silicate significantly accelerated the reaction process, resulting in shorter setting times and improved mechanical properties. Even a 1% addition of sodium hydroxide led to a compressive strength of 20 MPa for the mixtures. The addition of sodium hydroxide or sodium silicate also impacted the rheological behavior, enhancing structural build-up and transforming the shear-thinning behavior.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Yi Zhang, Yanmei Zhu, Qiang Ren, Bei He, Zhengwu Jiang, Kim Van Tittelboom, Geert De Schutter
Summary: With the urgent need for eco-friendly and labor-saving construction technologies, concrete 3D printing technology has gained increasing attention. However, there are limited studies on reinforcement techniques for 3D printed cement-based materials (3DPCM), which limits their applications. This study reveals the influence of rigid and flexible fibers on the printability and mechanical properties of 3DPCM. Results show that steel, polypropylene (PP), and polyvinyl alcohol (PVA) fibers improve the buildability but decrease the extrudability of 3DPCM.
CONSTRUCTION AND BUILDING MATERIALS
(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)