EFFECT OF ADDING SUPERPLASTICIZER ON HIGH INITIAL COMPRESSIVE STRENGTH OF HIGH-PERFORMANCE CONCRETE (HPC) FC’= 36.62 MPA

This research aims to determine the effect of the most optimal variation of the addition of Sikament- NN in producing high initial strength in High Performance Concrete (HPC) using Superplasticizer (Sikament-NN) added material on the compressive strength of concrete Fc' = 36.62 Mpa or K-450, by using 4%,5%,6%,7% and 8% variation of the Superplasticizer Sikament NN with the effect of accelerating hardening and strengthening the concrete to determine the most optimal variation. Researchers will test 150 cylindrical-shaped concrete samples with a size of 15 x 30 cm at the age of 3, 7, 14, 21 and 28 days. The result shows that the most optimum high initial compressive strength was achieved by concrete with 5% Sikamen NN added, at the age of 3 days with the initial compressive strength of the test object has surpassed the design compressive strength by 100.4% or equal to 34.65 Mpa, while at the age of 28 days produces an average concrete compressive strength of Fc' = 57.77 Mpa.