PENGARUH LIMBAH KACA SEBAGAI BAHAN ADITIF TERHADAP KUAT TEKAN BETON GEOPOLYMER PADA RIGID PAVEMENT

Abstract

Geopolymer is an inorganic form of aluminum silica which is synthesized from materials containing silica (Si) and alumina (Al) originating from nature or industrial by-products. The purpose of this study was to determine the compressive strength of geopolymer concrete on rigid pavements using glass waste as an additive . The method used for mix design calculations is AASHTO 1993 Rigid Pavement. The number of test objects made was 8 test objects using 4 aggregate and binder ratios , each having 2 activator ratios, namely 3:1 and 5:2. The test specimens that are ready are then removed from the mold and coded and soaked for 28 days. After 28 days, a compressive strength test is carried out on the specimen, using calculations according to the Concrete Compressive Strength Testing Method based on SNI-03-1794-2011. The highest results were obtained in the normal geopolymer concrete compressive strength test at 28 days, namely at a ratio of 75:25 N (5:2) of 18.8535 MPa, while the highest geopolymer concrete compressive strength test results using glass at the age of 28 days, namely at the comparison 70:30 KCA (5:2) of 22.0241 Mpa. Based on these results, the compressive strength of concrete meets the specification requirements of SNI 1974:2011 that the value of the compressive strength of K225 concrete is 18.68 Mpa. So it can be concluded that the higher the ratio of Na2SiO3 : NaOH, the higher the compressive strength produced. Glass as an additive also contains inorganic compounds that are conducive to the geopolymerization process as well as large glass particles that provide strength to the mixture by acting as aggregates.