PENGARUH PENAMBAHAN ZAT ADITIF TIPE F (SUPERPLASTICIZER) DENGAN VARIASI PENGURANGAN AIR TERHADAP NILAI KUAT TEKAN PADA MORTAR

Abstract

Many concrete technological innovations are expected to produce high quality. One of them is by improving the quality of the constituent material, namely mortar which functions as a matrix for binding aggregates in the concrete mixture. Reducing the water content in the mortar mixture results in a decrease in the workability of the mortar and causes the mortar to be hollow/porous so that the resulting quality decreases. Added materials are needed that can reduce the amount of water without reducing the value of flow. This study uses an additive type F (superplasticizer) with variations in water reduction which aims to determine its effect on the compressive strength value of the mortar. The test object is in the form of a cube with variations in the addition of 1% and 2% superplasticizer from the use of cement, and variations with the addition of superplasticizer with the same amount but reducing the amount of water use by 0%, 5%, 10% and 15% respectively. The test results showed that the addition of SP increased the compressive strength of the mortar. The increase in mortar with the addition of SP obtained the optimum value for the mixture B-1 of 30.128% with a compressive strength value of 36,889 MPa and B-2 of 34,513% with a value of 38,143 MPa. The addition of superplasticizer levels also affects the flow mortar value, namely the higher the addition of SP, the higher the flow value. The optimum value of flow mortar in sample B-2 was 20 cm.