Sustainable Geopolymer Pervious Concrete Pavement System

Permeable concrete, when combined with geopolymer, demonstrates promising properties. The objective is to develop a green, sustainable pavement system incorporating limestone aggregates and geopolymer concrete. Three different GPC mixes were designed using medium aggregates and an aggregate-to-metakaolin ratio of 4, 6, and 8. After determining the mechanical properties experimentally, the pavement design was carried out by calculating the maximum Equivalent Single Axle Load (ESAL) capacity. GPC and OPCPC produced similar compression results, ranging from 4.7 to 16.5 MPa. For OPCPC, flexural strength increased with decreasing porosity, reaching a flexural strength of 2.68 MPa at a porosity of 12%. GPC achieved a flexural strength of 1.91 MPa for the same porosity. The infiltration rate of OPCPC was higher than that of GPC in all three mixes. The tensile strength was inadequate for both types of pervious concrete, as failure occurred at the weakest point, leading to splitting into more than 2 parts due to the weak bond between layers. The GPC parking lot pavement design achieved acceptable bearing ESAL values for pavement thicknesses of 150 mm, 250 mm, and 350 mm. The GPC is a promising solution for parking lot pavements, as it can withstand loads.