LEVEL OF WORKABILITY AND MECHANICAL BEHAVIOR OF FLOW CONCRETE WITH FLY ASH UTILIZATION WITH VISCOCRETE 1050 HE

Abstract

The flowability of concrete is one of the problems that are often found in the construction world. Therefore, flow concrete can produce homogeneous mortar and can flow into dense repeating areas. The flow concrete in this study used fly ash derived from the acid-acid power plant. Fly ash is waste from coal that has pozzolan properties. Fly ash is more environmentally friendly than cement. To add flexibility to the concrete, a superplasticizer in the form of viscocrete 1050 HE was added. The requirement for the slump test on flow concrete is 19 cm.

This study was conducted using a cylinder test object with a diameter of 11 cm and a height of 22 cm and a beam test object measuring 50x10x10 cm. The fly ash content used is 0%, 20%, 30%, 40% and 60% as a substitute for cement and also uses a viscocrete superplasticizer 1050 HE added material 1% by weight of cement. Fresh concrete testing includes slump test, slump flow test and T₅₀₀. Hard concrete testing is a test of compressive strength, tensile strength, and bending strength of concrete. Compressive strength testing was carried out at the age of 14 days, 28 days, 56 days and 90 days.

The results showed that the flow concrete requirements were met, except for concrete with the use of 60% fly ash which did not meet the requirements. The more the use of fly ash, the lower the values of compressive strength, tensile strength and bending strength. Optimum levels were obtained for the test requirements of fresh concrete and hard concrete at a variation of 30% fly ash and 1% viscocrete 1050 HE with a slump value of 19 cm, slump flow 530 cm, T₅₀₀ 5 seconds, compressive strength 20 MPa, tensile strength 2.12 MPa.