Abstract

Damage to hydraulic structures’ surfaces, spillways, bridge pillars, and channel walls occurs due to surface friction between particles carried in the water, like sand, gravel, and debris flow. This surface abrasion damage will affect the operational lifespan. For this reason, materials that have qualified abrasion resistance are needed. Geopolymers are one of the materials that can be used. Geopolymer is an environmentally friendly material with aluminosilicate and alkali activator as the base material. This study’s novelty is using geopolymer materials as a binder for mortars. In this study, the geopolymer was made with a one-component system, stirred dryly with a ratio of binder and aggregate of 1:2, and the geopolymer design was made with 14 Molar. Abrasion testing is carried out using the ASTM C 1138 Underwater test method. From the test, the results of the abrasion test of geopolymer mortar at the age of 28 days were 1.318 8 x 10^-4 m³ with a compressive strength of 47.61 MPa, while normal mortar with a composition of 1:2 was 1.45 x 10^-5 m³ and a compressive strength of 28.45 MPa.