Cause Analysis of Freeze-Thaw Erosion of Pervious Concrete

Abstract

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

CLC Number:

TU528

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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