JIN Kairong
a. School of Civil & Water Conservancy EngineeringZHANG Xiaojing
a. School of Civil & Water Conservancy EngineeringBI Wanli
College of Materials and Metallurgy, University of Science and Technology, Anshan 114051, Liaoning, P. R. ChinaWANG Dezhi
a. School of Civil & Water Conservancy Engineering;Water Resources Engineering Research Center in Modern Agriculture in Arid Regions;Ningxia Center for Research on Earthquake Protection and Disaster Mitigation in Civil Engineering;Engineering Technology Research Center of Water-Saving and Water Resource Regulation, Ningxia University, Yinchuan 750021, P. R. ChinaHAN Jingyun
School of Civil Engineering, North Minzu University1.a. School of Civil & Water Conservancy Engineering;2.Water Resources Engineering Research Center in Modern Agriculture in Arid Regions;3.Ningxia Center for Research on Earthquake Protection and Disaster Mitigation in Civil Engineering;4.Engineering Technology Research Center of Water-Saving and Water Resource Regulation, Ningxia University, Yinchuan 750021, P. R. China;5.College of Materials and Metallurgy, University of Science and Technology, Anshan 114051, Liaoning, P. R. China;6.School of Civil Engineering, North Minzu University
TU528.01
Supported by National Natural Science Foundation of China(51968060, 52368037), the Ningxia Youth Talent Support Program(2080116), the Key Research and Development Program of Ningxia Province(2022BEE03001), Ningxia First Class Discipline Project(NXYLXK2021A03), and the National Natural Science Foundation of Ningxia(2023AAC03040).
The properties of magnesium oxysulfate (MOS) cement with different granite powder (GP) contents with CO2 curing were studied. The hydration products and microstructure of MOS cement were analyzed using X-ray diffraction (XRD), simultaneous comprehensive thermal analyzer (TG-DSC), scanning electron microscope (SEM) and mercury porosimeter (MIP). The results shows that the strength retention coefficient of MOS cement containing 40% GP reached 1.12 with standard curing for 28 days followed by 28 days of CO2 curing; when MOS cement was CO2-cured for 28 days and then immersed in water for 120 days, the strength retention coefficient reached 0.94, which was 123.8% higher than that of blank samples. MgCO3·zH2O crystals were generated after MOS cement underwent CO2 curing, which had a positive effect on the mechanical properties and water resistance by reducing matrix expansion caused by MgO hydrating to Mg(OH)2. GP increased the matrix density, reduced the CO2 capture rate, and decreased CO2 erosion of MOS cement by optimizing the pore structure. The presence of GP and magnesium carbonate phases improved the compressive strength of MOS cement after carbonation and immersion.
靳凯戎,张晓静,毕万利,王德志,韩静云.碳化对含花岗岩石粉硫氧镁水泥的抗压强度和耐水性的影响[J].重庆大学学报,2024,47(6):35~42
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