Microstructure and Performance Analysis of Pervious Concrete with Mineral Admixtures

Abstract

Abstract: Pervious concrete has significant pore characteristics, which can effectively solve urban waterlogging and conserve underground water systems. In view of the low compressive strength of pervious concrete caused by large pores, mineral admixtures were used to replace part of cement as cementitious materials in order to achieve the purpose of reducing production costs and improving compressive strength. In this paper, using fly ash, slag, metakaolin and other solid wastes as admixtures,compressive strength and water permeability tests were used to analyze the effects of single, double and triple-doped mineral admixtures on the properties of pervious concrete, and explore the hydration mechanism. The results show that the mechanical properties of pervious concrete with double-doped and triple-doped admixture system are significantly better than those of single-doped admixture system. When the content of fly ash, slag and metakaolin in triple-doped system is 15% (mass fraction, the same below), 15% and 10%, respectively, the property of pervious concrete is the best,of which the compressive strength is 22.1 MPa, and the porosity and water permeability coefficient are 14.3% and 3.27 mm/s, respectively, meeting the industry standards.

Key words: pervious concrete, mineral admixture, compressive strength, permeability coefficient, porosity

CLC Number:

TU528

LIU Pei, YAO Suling, DONG Xianshu, FU Yuanpeng, LI Dehao. Microstructure and Performance Analysis of Pervious Concrete with Mineral Admixtures[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2504-2512.

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