Article
Construction & Building Technology
Fengming Yang, Jiateng Xie, Weijie Wang, Wenlong Wang, Zengmei Wang
Summary: This study explored the preparation of ultra-early strength cementitious materials using TGO, which showed better dispersion and water storage capacity. TGO improved the early and continuous hydration reactions of cement by acting as a catalyst, and also enhanced the strength of the material by refining the pores and micro-cracks in the cement matrix.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Guangping Huang, Rajender Gupta, Wei Victor Liu
Summary: Sodium gluconate effectively extends the setting time and improves the workability of CSAB cement, with low dosages enhancing compressive strength but high dosages leading to a significant reduction in strength due to delayed hydration and looser microstructure.
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
(2022)
Article
Engineering, Civil
Guangping Huang, Deepak Pudasainee, Rajender Gupta, Wei Victor Liu
Summary: This study extended the blending proportion range of OPC and CSA cement blends and investigated the effects of proportions on the performance of the mixtures. It was found that with the increase of OPC content, the setting time of the blends was extended, workability was improved, and early-age strength decreased, but the strength development was still fast and long-term strength remained stable.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
H. Tayyab Adnan, Abigail Kienzle, Robert J. Thomas
Summary: This paper discusses the setting time and engineering properties of belitic calcium sulfoaluminate (BCSA) cement and concrete, including compressive strength, tensile strength, and modulus of elasticity. The research shows that the setting time of BCSA cement can be controlled by adjusting the dosage of a citric acid retarder. It also demonstrates that retarding the hydration of BCSA does not affect its long-term strength. Additionally, the paper measures the modulus of elasticity and tensile strength of BCSA concrete and suggests that predictive equations from industry standards tend to accurately predict the engineering properties of BCSA cement.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Thermodynamics
Yan Shen, Wei Zhang, Peifang Wang, Xi Chen, Hangyu Zhu
Summary: The addition of Li2CO3 accelerates the early hydration of CSA cement and decreases the setting time, with a corresponding decrease in setting time as Li2CO3 content increases. However, it also results in a decrease in compressive strength development of the mortars with Li2CO3.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Fanghui Han, Hongbo Zhang, Ziyi Li, Zhiming Pang
Summary: The effects of ordinary limestone powder (OLP) and ultrafine limestone powder (UFLP) on the fluidity, setting time, compressive strength, hydration heat and microstructure of calcium sulfoaluminate cement (CSA) were investigated. The fine limestone powder reduced the fluidity and setting time of CSA. Increasing the fineness of limestone powder improved the growth rates of strength and chemical bound water content, resulting in higher compressive strength and chemical bound water content. The hydration of CSA was dramatically promoted by adding UFLP, with a stronger effect at higher dosages, although cumulative hydration heat was reduced. The microstructure of hardened CSA paste became denser with the addition of UFLP. However, a higher content and finer limestone powder led to a larger amount of hemicarbonate and a minor amount of monosulfate phase (AFm). The poor bond between limestone powder and the surrounding hydrates resulted in a lower compressive strength in CSA mortar containing a larger amount of limestone powder.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Chemistry, Physical
Danying Gao, Zhenqing Zhang, Yang Meng, Jiyu Tang, Lin Yang
Summary: The research shows that the addition of FGDG can promote the hydration and improve the mechanical strength of CSAC-GGBFS mixture, but the content of FGDG should not exceed 6%.
Article
Chemistry, Physical
Jianzheng Wang, Shilin Song, Yu Zhang, Tao Xing, Ying Ma, Haiyan Qian
Summary: This study investigated the hydration characteristics and mechanical properties of calcium sulphoaluminate (CSA) cement with different contents of CaCO3 and gypsum under NaCl solutions. The results showed that CaCO3 promoted hydration and reduced the hydration heat of CSA cement, while gypsum reduced the aluminate phase and the content of Friedel's salt. CaCO3 and gypsum increased the total porosity and optimized the pore structure of the CSA cement paste in the early curing phase, and also reduced the linear shrinkage. The compressive strength of CSA cement was reduced with the addition of CaCO3, but improved in the long-term with the addition of gypsum. Overall, the addition of CaCO3 and gypsum improved the compressive strength of CSA cement mortar under NaCl solutions.
Article
Green & Sustainable Science & Technology
Hailong Liu, Jiuye Zhao, Yu Wang, Nangai Yi, Chunyi Cui
Summary: CSA-stabilized soil exhibited the highest UCS when the content of gypsum equaled 25 wt.% and had significantly higher early strength compared to OPC with the same mixing amounts. The intensity of Aft increased with the contents of gypsum increasing from 0 to 25 wt.%, and residual gypsum could be detected in the sample with 40 wt.% gypsum.
Article
Construction & Building Technology
Tristana Y. Duvallet, Manuelle Paraschiv, Anne E. Oberlink, Robert B. Jewell, Thomas L. Robl
Summary: This research successfully produced A/CSA cement from high-alumina fly ash, with higher early compressive strength compared to commercial OPC and CSA cements, and similar mechanical properties to CSA cement after 90 days, without visible carbonation.
ACI MATERIALS JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Feihan Jia, Hao Sun, Linyu Yu, Xiaolei Lu, Yiming Zhou, Mohamed Elchalakani, Peng Du
Summary: The preparation of ferrite-rich sulfoaluminate cement using red mud and desulfurization gypsum is feasible and can exhibit rapid mechanical strength development in the early and continuous development in the later stage.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Civil
Jian Zhao, Guangping Huang, Lin Liao, Wei Victor Liu
Summary: The potential of calcium sulfoaluminate (CSA) cement-based grouts in simulated permafrost environments was evaluated in this study. The hydration and performance of CSA cement-based grouts cured at various temperatures (-10, 0, and 10 degrees C) were investigated using temperature recording, X-ray diffraction (XRD) tests, thermogravimetric analysis (TGA), and unconfined compressive strength (UCS) tests. It was found that CSA cement-based grouts exhibited high early strength and a significant quantity of hydration products were generated at low temperatures, indicating rapid hydration. The strength of the grouts increased continuously with age, making them promising for permafrost applications.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2023)
Article
Construction & Building Technology
Peiyuan Chen, Liheng Zhang, Jialai Wang, Xing Lou, Le Huang, Ying Xu
Summary: Vitamin-C shows significant retarding effects on calcium sulfoaluminate cement (CSA), extending its setting time over five times without reducing compressive strength. This finding has the potential to provide more processing time and flexibility for the application of CSA.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Meng Dong, Jiang -Shan Li, Lei Lang, Xin Chen, Jiaxu Jin, Wei Ma
Summary: This study experimentally investigated the effect of thermal modified phosphogypsum (MPG) on the engineering properties of calcium sulphoaluminate cement (CSC), including setting time, compressive strength, and fluidity index. The micro-mechanisms of CSC incorporating MPG under different thermal treatment temperatures were also analyzed. The results showed that the optimum content of phosphogypsum was 10% and the thermal modification temperature was 300 degrees C, which achieved the maximum compressive strength of 41.59 MPa. The key findings of this study can achieve the double benefits of utilizing waste phosphogypsum and improving the engineering properties of CSC.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jiaoling Zheng, Shuaifei Wei, Qianqian Wang, Xiaodong Li, Suhua Ma
Summary: The synthesis of Alite-ye'elimite cement (ACSA) through the single firing process at lower temperature with the addition of phosphorous slag and copper slag has the potential to become a low-energy Portland cement. The coexistence of alite and ye'elimite can improve cement quality, and controlling the activation energy during their formation and decomposition processes is crucial for their better coexistence in cement production. Results showed that the diffusion model can determine their apparent activation energy, with temperature-dependent activation energy for alite and ye'elimite formation and decomposition.
Article
Construction & Building Technology
Pengkun Hou, Tafadzwa Ronald Muzenda, Qinfei Li, Heng Chen, Shiho Kawashima, Tongbo Sui, Haiyan Yong, Ning Xie, Xin Cheng
Summary: Limestone calcined clay cement (LC3) displays unique thixotropic properties, primarily influenced by the negative surface charge and flocculation phenomenon, which affects its fluidity and development trend.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Xingang Xu, Haifeng Bi, Yang Yu, Xinghua Fu, Shoude Wang, Yu Liu, Pengkun Hou, Xin Cheng
Summary: Sulphoaluminate cement is a potential encapsulation material for immobilizing Cs-137(+) and Sr-90(2+) in radioactive ion exchange resin, showing better retention capacity for Cs+ and Sr2+ compared to ordinary Portland cement. Experimental results demonstrated that the retention of Cs+ and Sr2+ in sulphoaluminate cement matrix was higher than that in OPC matrix.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Construction & Building Technology
Han Wang, Pengkun Hou, Qinfei Li, Samuel Adu-Amankwah, Heng Chen, Ning Xie, Piqi Zhao, Yongbo Huang, Shoude Wang, Xin Cheng
Summary: The addition of LC2 enhances the mechanical properties of slag cement mortars and optimizes the phase composition, promoting early hydration rates and improving later performances.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Fawad Muhammad, Pengkun Hou, Zheng Wang, Xiangming Zhou, Xin Cheng
Summary: The study explored the effects of organic releasing agent (RA) on cementitious materials, and introduced nanoparticles (nano-SiO2 and nano-TiO2) into RA to counterbalance the adverse effects on cement hydration. Results showed that the incorporation of nanoparticles into RA could improve the compressive strength of mortar and decrease water absorption rate.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Zhaoheng Guo, Pengkun Hou, Zhenhai Xu, Jianming Gao, Yasong Zhao
Summary: Nano-silica has a significant effect on the sulfate attack resistance of the C3S hydration system, retarding the sulfate attack process. Higher aluminum content leads to more serious deterioration.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Beibei Li, Pengkun Hou, Heng Chen, Piqi Zhao, Peng Du, Shoude Wang, Xin Cheng
Summary: The hydration and hardening properties of supersulfated cement (SSC) can be improved by controlling the dissolution of GGBS and the precipitation of hydrates with nanoSiO(2) (NS). NS increases the reaction rate of SSC, reduces gypsum consumption, compacts the microstructure, and enhances the strength of SSC.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Pengkun Hou, Xinming Wang, Xiangming Zhou, Xin Cheng, Surendra P. Shah
Summary: Silica fume (SF) and nanosilica (NS) can effectively improve the sulfate attack resistivity of tri-calcium aluminate (3CaO.Al2O3) - gypsum systems in harsh environments, mainly through the filling effect and reduction of crystal size-induced expansion.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Jungang Yuan, Yongbo Huang, Jinghua Yan, Fengnian Wu, Peng Du, Xiaolei Lu, Hao Liu, Shoude Wang, Piqi Zhao, Pengkun Hou, Lingchao Lu
Summary: This paper discusses the durability and physical performance of barium-calcium phosphoaluminate cement (PABC) at different temperatures through analysis of XRD, SEM-EDS and pore structure. The experimental results show that PABC exhibits decreased resistance to chloride ions penetration and sulfate attack at elevated temperatures ranging from 100°C to 300°C. Additionally, high temperatures ranging from 800°C to 1200°C worsen the performance of PABC, including compressive strength, mass loss ratio, and water absorption ratio. However, an improvement in performance is observed at 1400°C due to the generation of a new phase and changes in pore structure. The changing rules in performance with increasing temperatures demonstrate the unique characteristics of PABC under high temperatures.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Hao Sui, Pengkun Hou, Yanming Liu, Kwesi Sagoe-Crentsil, Felipe Basquiroto de Souza, Wenhui Duan
Summary: The pore structure development and hydration process of limestone calcined clay cement (LC3) were analyzed using a metal intrusion-enhanced imaging approach. It was found that the microstructural development of LC3 is initially inhomogeneous but becomes more uniform at later ages, leading to improved mechanical performance. LC3 exhibits more efficient particle packing, reducing the volume/connectivity of micro-pores and accounting for its notable flexural strength.
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
(2023)
Article
Construction & Building Technology
Jie Shi, Jinguang Zhao, Heng Chen, Pengkun Hou, Shiho Kawashima, Jihui Qin, Xiangming Zhou, Jueshi Qian, Xin Cheng
Summary: The acid resistance performance of magnesium phosphate cements is of great importance and this study found that magnesium ammonium phosphate cement has better resistance to sulfuric acid than magnesium potassium phosphate cement.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
Fawad Muhammad, Pengkun Hou, Xin Cheng, Zheng Wang, Zhanbin Liu, Surendra P. Shah
Summary: Improving the surface quality of cement-based materials plays a significant role in enhancing their resistance to sulfate attack, chloride migration, and freeze-thaw durability.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Shuo Lu, Piqi Zhao, Chen Liang, Lele Liu, Zichen Qin, Shoude Wang, Pengkun Hou, Lingchao Lu
Summary: In this paper, a high-performance polymer cement-based coating was developed by introducing PDMS in order to enhance its hydrophobicity and UV aging resistance, thus solving the issue of poor anti-deterioration and anti-UV aging properties in traditional polymer-cement-based coatings in marine environments. The coating exhibits excellent mechanical properties, with an internal contact angle greater than 130 degrees and an anti-deterioration efficiency of 99.3%. Even after UV aging and saltwater immersion, the coating maintains a dense-intact internal microstructure and a lower loss ratio of properties. The relative mechanisms are also revealed in the study.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Tongzhou Cai, Pengkun Hou, Heng Chen, Piqi Zhao, Peng Du, Shoude Wang, Xiangming Zhou, Xiaowei Wang, Xin Cheng
Summary: Alkalinity fluctuations greatly influence the compressive strength of supersulfated cement (SSC), limiting its usage, but there has been a lack of systematic research and compensation techniques. This study investigated the effects of clinker content and nanosilica addition on the performance of SSCs. The results showed that the addition of 1 wt% nanosilica effectively reduced the sensitivity of clinker content in SSC, but also hindered the early hydration of ettringite precipitation in low clinker samples.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Dong Dong, Yongbo Huang, Yan Pei, Xiaoyang Zhang, Na Cui, Piqi Zhao, Pengkun Hou, Lingchao Lu
Summary: The addition of spherical silica fume and fly ash into Magnesium ammonium phosphate cement (MAPC) improves its rheological properties, compressive strength, water resistance, and drying shrinkage, making it more suitable for crack repair engineering.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Dong Dong, Yang Wang, Yongbo Huang, Huichao Han, Jiang Zhu, Xiaoyang Zhang, Jingjun Li, Piqi Zhao, Pengkun Hou, Lingchao Lu
Summary: The viscosity of Magnesium ammonium phosphate cement (MAPC) paste was reduced by using three surfactants, including tributyl phosphate (TBP), polypropylene glycol 400 (PPG 400), and polyethylene glycol 200 (PEG 200). The hydration and performances of MAPC were also studied. The results showed that TBP was the most effective in reducing the viscosity of the MAPC paste. All the surfactants decreased the 1-day compressive strength of MAPC, but it still remained higher than 65 MPa. PPG 400 and PEG 200 prolonged the setting time of MAPC and reduced drying shrinkage, while TBP, PPG 400, and PEG 200 improved the bonding strength with old concrete, making it more suitable for crack repair.
JOURNAL OF BUILDING ENGINEERING
(2023)
