透水混凝土冻融剥蚀成因分析

摘要/Abstract

摘要： 为探究透水混凝土冻融剥蚀是否来自水泥浆体劣化,选取2.5~10.0 mm粒径骨料,制备了水灰比为0.31的透水混凝土及同水灰比的水泥石,测量二者冻融循环下质量、强度及透水混凝土相对动弹性模量变化。采用压汞法(MIP)测量水泥石冻融循环下孔结构特征参数及孔径分布变化,并通过扫描电镜(SEM)观察透水混凝土骨料水泥界面形貌演变。结果表明,在水冻与盐冻环境下透水混凝土宏观性能指标均有不同程度下降,骨料水泥界面产生裂缝并随冻融次数增加不断扩展,而水泥石强度、质量及微观孔隙结构均无明显变化。这表明透水混凝土冻融劣化与骨料水泥界面劣化相关。

关键词: 透水混凝土, 水泥石, 冻融循环, 劣化规律, 骨料水泥界面

Abstract: In order to explore whether the freeze-thaw erosion of the pervious concrete comes from the deterioration of cement paste, the aggregate of 2.5 mm to 10.0 mm was selected to prepare the pervious concrete with 0.31 water-cement ratio and the cement paste with the same water-cement ratio. The changes of mass, strength of the cement paste and the pervious concrete, and the relative dynamic elastic modulus of the pervious concrete under freeze-thaw cycles were measured. The characteristic parameters of pore structure and the pore size distribution of the cement paste under freeze-thaw cycles were measured by mercury porosimetry (MIP). The evolution of aggregate and cement paste interface morphology of the pervious concrete was observed by SEM. The results show that the macro performance indexes of the pervious concrete decrease in different degrees in water freezing and salt freezing environment, and cracks appear at the interface of aggregate and cement paste, and expand with the increase of freeze-thaw times. However, the strength, quality and micro pore structure of the cement paste have no obvious changes. This indicates that the freeze-thaw deterioration of the pervious concrete is related to the interface between aggregate and cement paste.

Key words: pervious concrete, cement paste, freeze-thaw cycle, deterioration law, aggregate and cement paste interface

中图分类号:

TU528

向君正, 宋慧, 冷梦辉, 桂发亮. 透水混凝土冻融剥蚀成因分析[J]. 硅酸盐通报, 2021, 40(7): 2215-2224.

XIANG Junzheng, SONG Hui, LENG Menghui, GUI Faliang. Cause Analysis of Freeze-Thaw Erosion of Pervious Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2215-2224.

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