Improvement of Reclaimed Asphalt Pavement Mixed with Crushed Rock by Using Fly Ash Based One-Part Geopolymer

Abstract

This research studied the improvement of pavement quality on recycled asphalt concrete mixed with fly ash aggregate. and using a catalyst flake sodium hydroxide (NaOH). Recycled asphalt concrete pavement per aggregate ratio was 100:0, 75:25, 50:50 and 25:75, fly ash ratio (FA) was 30%, sodium hydroxide concentration was 5 molar, cured age. The samples were taken for 7 and 28 days, varying the moisture content at 80, 100 and 120 percent, respectively. Then, the uniaxial compressive strength (USC) test of pavement quality was improved from the uniaxial compressive strength test results. It was found that the uniaxial compressive strength (USC) increased with increasing amount of crushed stone. The maximum compressive strength was found at the optimum moisture content. In addition, the compressive strength will increase with increasing curing time, with a maximum curing time of 28 days. The study found that it is possible to use old asphalt concrete as an alternative material for construction or can improve the road which passed the requirements of the Department of Highways at the level of the pavement Cement-mixed rock that requires uniaxial compressive strength to be not less than 24.50 ksc at a curing time of 7 days.