Chloride Ion Transport in Polypropylene Fiber Concrete under Dry-Wet Cycle

Abstract

Abstract: In order to explore the transmission law of chloride ions in polypropylene fiber concrete under the action ofdry-wet cycles, four types of polypropylene fiber concrete were designed for experiments, and the free chloride ion content and total chloride ion content were measured under different dry-wet cycles. Measure and analyze the influence of polypropylene fiber incorporation on the chloride ion binding performance and chloride ion diffusion coefficient of concrete. The results show that the incorporation of 0.15% (volume fraction, same below) polypropylene fiber increases the compactness of concrete and reduces the content of free chloride ion. While the incorporation of a large number of fibers (<0.45%) leads to an increase in the content of free chloride ion in the concrete and increases the chloride ion content of the concrete. Ion binding capacity. In the range of 0% to 0.45% of polypropylene fiber content, the chloride ion binding capacity has a quadratic function relationship with the fiber content. The incorporation of polypropylene fiber reduces the chloride ion diffusion coefficient in the later stage of the dry-wet cycle and increases the time-dependent coefficient m, which is beneficial to improve the resistance of concrete to chloride ion erosion.

Key words: polypropylene fiber concrete, dry-wet cycle, chloride ion content, chloride ion diffusion coefficient

CLC Number:

TB332

XIE Guoliang, SHEN Xiangdong, JIANG Wei, ZHANG Bin. Chloride Ion Transport in Polypropylene Fiber Concrete under Dry-Wet Cycle[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 2019-2025.

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