The Effect of Compressive Strength of Concrete with Epoxy Putty Mixture on Immersion with PDAM Water and Seawater

Coastal areas are prone to abrasion in some places, such as on the coast of Mempawah at Tanjung Burung Beach.The local community seeks the government to quickly build a concrete breakwater in order to reduce the impact of coastal abrasion.In this case the concrete to be made uses epoxy putty additives where this material aims to reduce absorption and increase the physical quality of the concrete.Before the manufacture of concrete is carried out, first conduct material testing aims to determine the characteristic properties of the material used to comply with the regulations, namely testing the physical and mechanical properties of aggregates (SNI 03-1971(SNI 03- -1990)).Slump test (SNI 03-1972(SNI 03- -1990)).Test objects were made with a size of 150 mm x 150 mm x 150 mm (cube) with concrete soaking for 14 and 28 days.For concrete mix variations with the addition of epoxy putty at 0% (normal), 1%, 3%, and 5% with a normal concrete compressive strength plan used 20 MPa.With the addition of epoxy putty in PDAM water immersion, the compressive strength of concrete decreased by 27.31%, 49.31% and 37.24% compared to normal concrete.Meanwhile, with the addition of epoxy putty and concrete immersion in seawater, the compressive strength of concrete increased by 3.18%, 38,59% and 37,53% compared to normal concrete.