STUDI PENAMBAHAN WATERPROOFING TERHADAP SIFAT KEDAP AIR DENGAN RENDAMAN AIR LAUT PADA BETON K-250

Abstract

Concrete is a composite material consisting of a mixture of aggregates and cement as a binder. One special type of concrete is waterproof concrete, which is commonly used in structures located in wet environments, such as bridge foundations, basement walls, swimming pools, and concrete roofs. To enhance water resistance, an additional layer of waterproofing mortar is applied. This study aims to determine the effect of adding waterproofing mortar on the water resistance of K-250 concrete immersed in both fresh water and seawater. The compressive strength test results showed average values of 252.64 MPa for normal concrete (BN), 287.08 MPa for concrete with waterproofing mortar in fresh water (BRAB), and 269.46 MPa in seawater (BNAL). The absorption test results were 3.281 for BN, 2.842 for BRAB, and 2.667 for BNAL. These findings indicate that waterproofing mortar increases compressive strength and reduces water absorption, making it effective in enhancing the durability of concrete against water penetration.