Compressive, Shear Strength and Workability of Geopolymer Concrete Containing Recycle Asphaltic Concrete Aggregate for Repair Materials

Abstract

This research, the compressive, shear strength and workability of geopolymer concrete containing recycle asphaltic concrete for repair material were studied. The concrete were made from fly ash that from Mae Moh power station in Lampang province, Thailand, sodium silicate (NS), sodium hydroxide (NH) 10 molars, ratio of NS:NH is 1:1, river sand, natural rock, recycle asphaltic concrete aggregate (RACA) was classified as coarse aggregate (4.75 – 19.0 mm.) and fine aggregate (1.18 – 4.75 mm.), mix coarse aggregate : fine aggregate ratio of 1:3. And use RACA to replace natural rock at 20 and 40% by weight of natural rock. And improve the properties of geopolymer concrete by replace fly ash with ordinary Portland cement (OPC) at 10% by weight of fly ash. Cure at room temperature until 28 days. The compressive, shear strength, density and flow were tested. The results of compressive strength between 313 and 432 kg/cm², shear strength between 93 and 139 kg/cm², density between 2,283 and 2,356 kg/m³ and flow between 69 and 75 cm. were obtained. And the results showed that can be used geopolymer concrete containing recycle asphaltic concrete aggregate as concrete structure. In addition, flow is appropriate to be used as a repair material.