Effects of Curing Methods on the Permeability and Mechanism of Cover Concrete  

作　　者：Wang Hao Baolin Guo Yongzhi Guo Ruishuang Jiang Fangli Zhao Baomin Wang 

机构地区：[1]Shandong Hi-speed Company Limited,Jinan,Shandong,250101,China [2]School of Civil Engineering Dalian University of Technology,Dalian,Liaoning,116000,China [3]Transportation Research Institute of Shandong Province,Jinan,Shandong,250100,China

出　　处：《Journal of Building Material Science》2023年第1期20-31,共12页建筑材料科学（英文）

基　　金：The authors would like to acknowledge the fi­nancial support provided by the National Key R&D Program of China(Grant number2018YFB1600100);this study is also funded by Shandong Transpor­tation Science and Technology Plan(grant number 2018B44).

摘　　要：Curing methods are one of the most important factors in determining the quality and compactness of cover concrete.The 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 test.The vacuum saturation test and mercury intrusion test were employed to characterize these differences in the pore structure of cover concrete under different curing methods.With further analysis of the compactness of microstructure by SEM,the mechanism of the impact of curing methods on the permeability of cover concrete was revealed.The 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 curing.It is also shown that reasonable curing is advantageous to reduce the porosity and permeability of cover concrete.In 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 concrete.Therefore,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 

分 类 号：TU5[建筑科学—建筑技术科学]