A Study on the Use of Mortar Utama Cement Type 420 as Concrete Admixture

Abstract

This research was conducted at laboratory scale in the form of experiment for the purpose to know the value of concrete strength by using Mortar Utama Cement Type 420 as concrete mixing additive. The concrete mixing method being used was SNI 03-2834-2000. The concrete quality being used was K 250, K 300 and K 350. Additions of Mortar Utama Cement were for 5%, 10%, 15% and 20% of cement weight. The strength was tested on the 3rd, 14th, 21st and 28th days of concrete making. According to the test result, it can be concluded that the highest strength of concrete for K 250 with 5% addition was 275.09 Kg/cm2, for K 300 with 5% addition was 325.32 kg/cm2, while for K 350 with 5% addition was 368.48 kg/cm2. Additions of Mortar Utama cement type 420 were able to influence the strength of concrete with simple linear regression model for K 250: Y = −2.005X + 272.7 with R2 = 0.757, for K 300: Y = −3.061X + 328.3 with R2 = 0.731, and for K 350:Y = −3.114X + 362.5 with R2 = 0.785.