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Effects of curing methods on the Permeability and Mechanism of Cover Concrete

Journal of Building Material Science 2023年第1期5卷 20-31页

作者： Wang Hao Baolin Guo Yongzhi Guo Ruishuang Jiang Fangli Zhao Baomin Wang Shandong Hi-speed Company Limited JinanShandong250101China School of Civil Engineering Dalian University of Technology DalianLiaoning116000China Transportation Research Institute of Shandong Province JinanShandong250100China

curing methods are one of the most important factors in determining the quality and compactness of cover *** effect of curing methods on the water absorption and sorptivity coefficient of cover concrete with the substitution ratio of fly ash(FA)and ground granulated blast slag(GGBS)for cement between 30 wt%and 40 wt%was studied by capillary water absorption *** vacuum saturation test and mercury intrusion test were employed to characterize these differences in the pore structure of cover concrete under different curing *** further analysis of the compactness of microstructure by SEM,the mechanism of the impact of curing methods on the permeability of cover concrete was *** results obtained indicate that the effect of curing methods on the water absorption,sorptivity coefficient and porosity of cover concrete shows the trend of natural curing>cover curing>water curing>standard *** is also shown that reasonable curing is advantageous to reduce the porosity and permeability of cover *** natural curing conditions,the appearance of porosity increasing and pore structure coarsening is more critical for covering concrete with mineral admixtures than for pure cement ***,the permeability of cover concrete with mineral admixtures is more sensitive to the early-age curing methods.

关键词： curing methods Cover concrete Permeability Capillary water absorption Porosity

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Experimental study on the properties of CMTs-incorporated geopolymers prepared at low temperatures

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Journal of Southeast University(English Edition) 2024年第3期40卷 295-303页

作者： Jin Quanbin Liu Zhibin Lu Liangliang Zhang Yun Luo Tingyi Tang Yasen Jiangsu Key Laboratory of Low Carbon and Sustainable Geotechnical Engineering Southeast UniversityNanjing 211189China Guangxi Beitou Construction and Investment Group Co. Ltd.Nanning 530028China

Considering that copper mine tailings(CMTs)are commonly mixed with ordinary Portland cement,fly ash(FA),and kaolin to produce geopolymers,to make full use of CMTs,the properties of geopolymers manufactured under different material mass ratios and curing methods(standard curing,water bath curing,and 60℃curing)are evaluated with significantly increased dosage of *** and unconfined compressive strength tests,X-ray diffraction,field emission scanning electron microscopy,and energy dispersive spectroscopy are used to determine the physical and mechanical properties,microstructure,and mineral composition of ***,costs and CO 2 emissions of specimens with different material mass ratios during the preparation processes are *** results show that during the geopolymerization of low-calcium materials,various geopolymer gels,including calcium silicate,calcium silicoaluminate,and mainly sodium silicoaluminate gels,*** solid waste,cost,and carbon dioxide emission reductions can reach 100%,166.3 yuan/t,and 73.3 kg/t,*** a curing condition of 60℃,the sample with a CMTs mass fraction of 70%and an FA mass fraction of 30%meets the requirements of porosity,compressive *** resource utilization of CMT and FA is realized in a more economical way.

关键词： copper mine tailings geopolymer solid wastes characterization techniques curing methods carbon dioxide emission

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