Composition Design of Pervious Concrete with Water Purification Function

Abstract

Abstract: In order to purify rainwater and supplement groundwater, a class of metakaolin-based geopolymer pervious concrete with water purification function was designed. By studying the effects of chitosan content, alkali activator modulus and concentration of alkali activator on the mechanical and adsorption properties of the metakaolin-based geopolymer, a kind of paste material with high adsorption for pervious concrete was prepared. The effects of volume structure parameters such as bulk porosity of aggregate and P/A (paste aggregate ratio) on water purification, water permeability and mechanical properties of pervious concrete were studied. The results show that with the increase of chitosan content, the strength of metakaolin-based geopolymer increases firstly and then decreases, and the adsorption capacity of Pb²⁺ increases. With the increase of bulk porosity of aggregate, the mechanical and water purification properties of pervious concrete decrease, and the water permeability increases. With the increases of the P/A, the mechanical and water purification properties of pervious concrete increase, while the water permeability decreases. The 28 d compressive strength, permeability coefficient and Pb²⁺ removal rate of pervious concrete with coordinated water purification, permeability and mechanical properties are 20.1 MPa, 0.67 cm/s and 90.5%, respectively.

Key words: pervious concrete, geopolymer, water purification property, bulk porosity, paste aggregate ratio

CLC Number:

U416.1

JIA Junhong, YU Yue, GUO Yuguang, NIU Zidong. Composition Design of Pervious Concrete with Water Purification Function[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2554-2563.

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