Article
Chemistry, Physical
Jian Ma, Ting Wang, Hu Shi, Zhuqing Yu, Xiaodong Shen
Summary: This study investigates the effects of limestone powder and gypsum on the early hydration of ye'elimite. The results show that adding limestone powder has a comparable hydration heat evolution to systems without limestone powder, and increasing the dosage of limestone powder shortens the level off time of chemical shrinkage. The thermodynamic modelling results further support the experimental findings.
Article
Thermodynamics
Jian Ma, Xiaomin Liu, Zhuqing Yu, Hu Shi, Qingyong Wu, Xiaodong Shen
Summary: This paper thoroughly investigates the effects of limestone powder on the hydration of Portland cement and the formation and transformation mechanism of calcium carboaluminate phases. The results show that the addition of limestone powder delays the formation of hemicarboaluminate and reduces chemical shrinkage.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Construction & Building Technology
Yang Du, Lifeng Zhang, Shaoqin Ruan, Xiaoqian Qian, Kuangliang Qian, Pengyun Cheng, Gaohang Lin
Summary: This study investigates the effects of powder gradation on the fresh state, mechanical properties, and early-age shrinkage of UHPC. The results show that dense powder gradation affects the fluidity and early-age strength, likely due to variations in hydration processes. In addition, accurate assessments of shrinkage components reveal that drying shrinkage dominates the total shrinkage of UHPC at an early age. Moreover, the calculation of critical pore diameters provides theoretical clarification on the development of drying shrinkage when combined with pore structure.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Xu Luo, Jianming Gao, Shujun Li, Yasong Zhao, Gaofeng Chen, Cheng Liu
Summary: The early age hydration and autogenous shrinkage of blended cement containing brick powder (BP) were studied using hydration heat, internal relative humidity (IRH) and 1H NMR methods. The results show that BP can promote the early nucleation and growth process of cement. The unique porous structure of BP gives it water absorption property, which plays a role in internal curing. The internal curing effect of BP reduces the rate of decrease of IRH in cement paste and effectively reduces the autogenous shrinkage of cement paste.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Jian-Xin Lu, Peiliang Shen, Yangyang Zhang, Haibing Zheng, Yanjie Sun, Chi Sun Poon
Summary: The study evaluated the effectiveness of using seawater as mixing water in improving the early-age properties of cement pastes/mortars prepared with low-reactive waste glass powder. The results showed that the combination of seawater and waste glass powder enhanced early-age strength by accelerating hydration and refining pore structure, overcoming the dilution effect and prolonged setting time. The incorporation of waste glass powder increased yield stress and plastic viscosity of the cement paste, while seawater further changed the rheological properties by accelerating cement hydration.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Construction & Building Technology
Xiaohong Zhu, Xiaojuan Kang, Jiaxin Deng, Kai Yang, Shouheng Jiang, Changhui Yang
Summary: This study focuses on the physical and chemical influence of limestone powder (LS) on the AAS system. The addition of 50% LS was found to improve the fluidity and setting time of AAS pastes, while reducing the drying shrinkage of AAS mortars. However, it also led to a decrease in mechanical properties and had an impact on the pore structure.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Shaodan Hou, Jianzhuang Xiao, Zhenhua Duan, Guowei Ma
Summary: This study utilized recycled powder to partially replace cement in 3D printed mortar, investigating its properties and confirming the results through 3D printing. The incorporation of RP improved the flowability of 3DPM and showed better strength performance at a certain replacement ratio.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Dafu Wang, Yunsheng Zhang, Jia Xiao, Jiashun Shi, Yidong Chen, Bo Pang, Meng Wu, Guojian Liu, Yonggan Yang
Summary: The researchers developed a structural kinetics model to indicate the structural build-up of fresh cement-based materials. Experiment results show that the effect of limestone powder on the static structural build-up of concrete is more pronounced.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Soufien Moula, Amor Ben Fraj, Thomas Wattez, Marwen Bouasker, Nizar Bel Hadj Ali
Summary: This paper discusses an innovative approach for developing a more sustainable Ultra-High Performance Concrete (UHPC) using ground granulated blast furnace slag (GGBS). Partially replacing ordinary Portland cement (OPC) with GGBS improves workability, promotes cement hydration, and accelerates setting. Finer GGBS particles result in a greater acceleration of setting and hydration. A more sustainable UHPC with reduced shrinkage has been successfully produced by incorporating a high level of superfine slag.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Jingzhe Li, Binggen Zhan, Peng Gao, Li Hu, Min Qiao, Huiling Sha, Qijun Yu
Summary: This study investigates the influence of substitution rate and types of recycled concrete powders (RCPs) on the rheology over time, setting time, and 1 day compressive strength of cement paste. Incorporating RCPs enhances the initial rheological properties and growth rate of cement paste, but decreases the hydration reaction and pore structure beyond a certain time, resulting in reduced compressive strength. RCPII cement paste with the same RCP content exhibits lower initial rheology, higher growth rate of rheological parameters, lower total porosity, and relatively higher 1 day compressive strength compared to RCPI cement paste.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Computer Science, Interdisciplinary Applications
Aso Abdalla, Ahmed Salih Mohammed
Summary: Supplementary cementing ingredients have become essential in concrete and cement-mortar mix design. This study used Multi Expression Programming (MEP) to estimate the compressive strength of cement mortar modified with fly ash. The MEP model outperformed other models according to evaluation tools.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2022)
Review
Construction & Building Technology
Shiho Kawashima, Kejin Wang, Raissa Douglas Ferron, Jae Hong Kim, Nathan Tregger, Surendra Shah
Summary: This paper provides an overview of the use of nanoclays in cement-based materials, discussing their impact on shear rheological properties and structural build-up behavior. It also examines the effects of nanoclays on fresh microstructures, providing insight into their flocculation and coagulation behavior. Additionally, it discusses secondary effects on hardened properties and presents examples of casting applications utilizing nanoclays as rheological modifiers.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Paulo R. de Matos, Jose S. Andrade Neto, Luis U. Tambara Jr, Erich D. Rodriguez, Ana P. Kirchheim, Carlos E. M. Campos
Summary: This article reports the first attempt to use in-situ X-ray diffraction (XRD) to measure the early-age volumetric variation of a cementitious paste, indicating the potential of this technique but further research is needed.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Construction & Building Technology
Xu Luo, Jianming Gao, Shujun Li, Zhenhai Xu, Gaofeng Chen
Summary: The study found that the replacement ratio of recycled brick powder (RBP) is inversely proportional to the hydration heat, and the particle size of RBP plays a crucial role in the hydration process of cement. Incorporating RBP reduces the flowability of the cement paste, increases the yield stress and viscosity, and delays the setting time.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Niall Holmes, Mark Tyrer, Denis Kelliher
Summary: This paper presents a thermodynamic model to predict the chemical shrinkage volume during hydration of two cements over time. The model uses the cemdata18 database and a series of discrete solid phases (DSPs) to represent C-S-H. The paper also shows a linear relationship between chemical shrinkage and the overall degree of hydration.
Article
Construction & Building Technology
Bei He, Mingjun Xie, Zhengwu Jiang, Cong Zhang, Xinping Zhu
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Energy & Fuels
Yushi Liu, Kunyang Yu, Mingjun Xie, Shuang Lu, Yingzi Yang, Hui Wang, Hanxi Jia
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2020)
Article
Construction & Building Technology
Qiang Ren, Zhiyong Zeng, Mingjun Xie, Zhengwu Jiang
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Construction & Building Technology
Xinping Zhu, Zhengwu Jiang, Bei He, Chen Qian
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Construction & Building Technology
Yi Zhang, Zhengwu Jiang, Yanmei Zhu, Jie Zhang, Qiang Ren, Tao Huang
Summary: This study investigates the effects of different types of redispersible polymer powders on the structural build-up of 3D printing cement paste, showing that polymers with different compositions have varying impacts on the performance of cement paste, and hydroxypropyl methylcellulose (HPMC) also plays a role. The shape stability and printing efficiency of cement paste can be quantitatively characterized by limit layer thickness and printing velocity.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Mingjun Xie, Yijin Zhong, Zheng Li, Fanghua Lei, Zhengwu Jiang
Summary: The length of alkyl chain in silanes affects the hydration process and mechanical properties of cement, with shorter chain resulting in stronger retardation of hydration. Changes in porosity due to silane incorporation may also contribute to the decrease in mechanical properties. Additionally, SEM images reveal the formation of fiber-like needle products on the surface of hydrated cement, which are likely composed of specific types of silanes produced from the reaction between calcium hydroxide and silane.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Engineering, Multidisciplinary
Xinping Zhu, Bei He, Mingjun Xie, Yi Zhang, Zhengwu Jiang
Summary: The study found that cryogenic attack may chemically transform the surface of calcium-silicate-hydrate (C-S-H), resulting in higher adsorbate attraction, with mesopores of C-S-H with high Ca/Si ratio better preserved. Moreover, the smaller micropores were more sensitive to cryogenic attack.
Article
Construction & Building Technology
Zhengwu Jiang, Qian Yang, Yanmei Zhu, Yi Zhang, Qiang Ren
Summary: This paper examines the printability of ordinary Portland cement mortar with calcium sulphoaluminate cement as the stiffening control agent. The results show that the addition of calcium sulphoaluminate cement slightly decreases the initial flowability of the mortar and significantly increases the flowability loss with rest time. However, it improves the shape stability of the mortar and has a significant promotion on the growth of penetration resistance with time.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Computer Science, Interdisciplinary Applications
Shuai Zhou, Chong Wang, Chao Zhang, Yi Zhang
Summary: This study investigates the mechanical properties of cement-based materials reinforced with steel fibers and calcium carbonate whiskers. The results show that the use of the infiltration casting method can achieve high ductility in the slurry infiltrated fiber concrete (SIFCON) with a steel fiber content of 12.2%. The addition of calcium carbonate whiskers improves the tensile and compressive properties of the specimens. A nonlocal model is developed to quantify the influence of calcium carbonate whiskers on the performance of SIFCON.
ENGINEERING WITH COMPUTERS
(2023)
Article
Engineering, Multidisciplinary
Xinping Zhu, Qiang Ren, Bei He, Hongen Zhang, Zhengwu Jiang
Summary: This study reveals the structural stability of C-(A)-S-H under ultra-low temperature attack and evaluates the role of aluminum as an enhancement strategy for C-S-H. The results show that ultra-low temperature can deteriorate C-(A)-S-H structure, but the incorporation of aluminum positively stabilizes it. The study provides a multiscale view to understand the degradation of concrete composites upon ultra-low temperature attack.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Construction & Building Technology
Hongen Zhang, Bei He, Xinping Zhu, Qingyuan Wang, Zhengwu Jiang
Summary: This study investigates the flexural performance of ultra-high-performance concrete (UHPC) under a simulated lunar ground temperature environment and characterizes the cracking behavior using acoustic emission (AE) technique. The results show that UHPC specimens exposed to the alternating elevated and cryogenic attack (AECA) still exhibit superior flexural performance. Tensile cracks are mainly generated by the failure of cement matrix, while shear cracks are mainly attributed to the debonding and pull-out behavior of steel fibers from the matrix. AECA exhibits a dual effect on the flexural performance of UHPCs, with a competitive relationship between enhancement and deterioration effects.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
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)
