Abstract
Concrete is a composite material (mixture) of several materials, whose main material consists of a mixture of cement, fine aggregates, coarse aggregates, water and or without other added ingredients coconut fibers are only used for broom materials, rugs, ropes and household appliances.Therefore, the addition of burning concrete into coconut ash ash is tried.The method used was experimental carried out in the laboratory with the production of 12 test pieces with presentations of 0%, 0.25%, 0.5% and 0.75% at 7 days.Laboratory test results on the addition of coconut fiber ash to the normal K 100 presentation were 16.505 MPa, coconut fiber ash mixture 0.25% reached 23.895 MPa, coconut fiber ash mixture 0.5% reached 23.656 MPa, the highest fiber ash mixture concrete 0.75% coconut can reach compressive strength of 23,688 MPa.
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