Abstract: Pervious concrete has been widely concerned and studied due to its water and air permeability, sound absorption and noise reduction. Nevertheless, the porous structure of pervious concrete makes it bear non-uniform forces, limiting the application of pervious concrete to the pavement with low load. For the sake of improving the strength and durability of the pervious concrete, geopolymer was taken as cementing materials for pervious concrete. Orthogonal test was designed to study the optimal mixing proportion of pervious concrete. The effects of porosity, aggregate particle size, liquid-to-binder ratio, slag content and water glass modulus on the properties of pervious concrete were analyzed. Furthermore, taking the compressive strength, splitting tensile strength, permeability coefficient and freezing resistance as indices, the relationships between porosity and permeability coefficient, permeability coefficient and compressive strength, porosity and splitting tensile strength were discussed through fitting analysis. Results indicated that the optimal proportion of pervious concrete were target porosity of 15%, liquid-to-binder ratio of 60%, aggregate size of 2—5 mm, water glass modulus of 1.4, slag content of 20%. The pervious concrete obtained under optimal proportion exhibited the 28 d compressive strength of 33 MPa, splitting tensile strength of 2.4 MPa, permeability coefficient of 8.4 mm/s, with an anti-free-zing performance appropriate to the standard.
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2019, Vol. 33 
