The Value Compressive Strength and Split Tensile Strength on Concrete Mixture With Expanded Polystyrene Coated by Surfactant Span 80 as a Partial Substitution of Fine Aggregate

Abstract

The value of the density normal concrete which ranges between 2200-2400 kg/m 3 . Therefore the use of Expanded Polystyrene (EPS) as a subitute to fine aggregate can reduce the density of concrete. The purpose this research is to reduce the density of normal concrete but increase compressive strength of EPS concrete, with use surfactant as coating for the EPS. Variables of substitution percentage of EPS and EPS coated by surfactant are 5%,10%,15%,20%,25%. Method of concrete mix design based on SNI 03-2834-2000 Tata Cara Pembuatan Rencana Campuran Beton Normal (Provisions for Proportioning Normal Concrete Mixture). The result of testing, every increase percentage of EPS substitution will decrease the compressive strength around 1,74 MPa and decrease density 34,03 kg/m 3 . Using Surfactant as coating of EPS , compressive strength increase from the EPS's compressive strength. Average of increasing compressive strength 0,19 MPa and increase the density 20,03 kg/m 3 ,average decrease of the tensile split strength EPS coated surfaktan is 0,84 MPa. Along with technological developments in the field of construction, using concrete materials are commonly used as a material that supports the building structure . Theoretically, the concrete material is able to resist high compressive strength, but not good enough to resist tensile strength. The value of the density normal concrete which ranges between 2200-2400 kg/m 3 , this will affect the total weight of the building structure. The decreasing density of the concrete will reduce the weight of the building. To reduce the density of normal concrete, concrete toward research that has less weight is being carried out at several universities or in the concrete mix design company. One way to reduce the density of normal concrete by reducing the fine aggregate, material to be added Expanded Polystyrene (EPS) in the concrete mix. So in this way is expected that the resulting concrete material has a light density. Park and Chisholm use polystyrene as fine aggregate and has a less specific gravity ranges from 520 to 1040 kg/m3 has a very low compressive strength, which is in the range 0.7 MPa to