Analisis Pengaruh Temperatur terhadap Karakteristik Beton dengan Penambahan 2% Limbah Karet Padat dari Berat Beton Normal (Analysis of Temperature Effect on Concrete Characteristics with an Addition of 2% Rubber Solid Waste from the Weight of Normal Concrete)

Abstract

Concrete has a weakness in tensile strength because the nature of concrete is more brittle than other building structures. Moreover, basically concrete is a fire-resistant materials. However, when happen of temperature changes is quite high, as happens in fire events, temperature changes will be affect the structural elements. Therefore we need a concrete mixing innovation with added elastic fiber material such as rubber waste and giving temperature on the rubber concrete. Expected by administering temperature, rubber waste can melt and fill cavities, so that the concrete becomes more dense and has good characteristics. In this research an addition of rubber waste as much as 2% of the weight of normal concrete, in the form of small pieces with a size between 5-15 mm. Tests conducted to determine the value of a compressive strength, split tensile strength, and modulus of elasticity of concrete with the addition of the fiber post by the influence of temperature. Calculations of concrete mix design using the calculation of normal concrete mix (SNI 03-2834-2000) with compressive strength the plan 20 MPa. Combustion is done for ± 3 hours in a furnace at a temperature of 0°C - 400°C to 100°C rise interval. Combustion is done when the concrete samples aged 28 days, while the test is done when the concrete samples older than 28 days. The results showed that the addition of solid rubber waste fiber as much as 2% of the weight of normal concrete in the concrete mix resulted in a reduction in a compressive strength, split tensile strength and modulus of elasticity of concrete. The test results compressive strength concrete decreased successively from 0°C up to 400°C temperature of 25.079%; 41.463%; 9.501%; 30.685%; and 33.739% of the concrete without fibers with the same temperature. Results of testing the split tensile strength of concrete decreased sides respectively from the temperature 0°C up to 400°C of 9.217%; 15.586%; 8.542%; 25.258%; and 29.917% of the concrete without fibers with the same temperature. The test results of concrete elastic modulus decreased successively from 0°C up to 400°C temperature of 18.167%; 10.883%; 2.227%; 15.279%; and 22.548% of the concrete without fibers with the same temperature.