ANALYSIS OF THE EFFECT OF ADDITIONAL CONCRETE ADDITIVES ON THE COMPRESSIVE STRENGTH OF CONCRETE USING LOCAL AGGREGATES IN EAST KALIMANTAN
Concrete is chosen as a construction material because it is easy to make, but there are always obstacles, one of which is the limited distribution of Palu aggregate material, so research is needed on the use of local materials as concrete forming materials. The purpose of this study was to determine the effect of adding SikaCim Concrete Additive using Senoni coarse aggregate and Muara Bengkal sand as concrete forming material. The analysis carried out is to study the theory of concrete technology and analyze the results of laboratory testing of aggregates. The method used from the Department of Public Works is SK. SNI. T-15-1990-03 "Procedure for Making Normal Concrete Mix Plan". The planned concrete quality is K-250. The test objects used were 15x15x15 cm cubes as many as 36 test objects, with 4 (four) variations of added ingredients, namely: 0.0% (normal), 0.3%, 0.7%, and 1.0% SikaCim Concrete Additive by weight of cement. Concrete compressive strength testing was carried out at the age of 3, 7 and 28 concrete. The results of this study are the compressive strength of concrete with and without the addition of SikaCim Concrete Additive has not reached the compressive strength of the K-250 plan. The highest compressive strength of normal concrete at the age of 28 days with a value of 177.15 kg/cm2. In the addition of SikaCim Concrete Additive, the highest concrete compressive strength at the age of 28 days was 229.68 kg/cm2 for the variation of adding 1.0% SikaCim Concrete Additive. The percentage increase in compressive strength of concrete in terms of compressive strength at the age of 28 days experienced the highest increase from normal concrete, namely 29.66% for the addition of 1.0% SikaCim Concrete Additive.
Concrete, Compressive Strength, Sikacim, Additive, Coarse Aggregate.