TINJAUAN KUAT TEKAN DAN MODULUS ELASTISITAS BETON DENGAN MENGGUNAKAN LIMBAH BATU CANDI SEBAGAI PENGGANTI AGREGAT KASAR

Abstract

Nowadays the use of concrete is increasing but the concrete raw materials fulfillment is decreasing. In this case, one of alternative is to be replacedthe coarse aggregate with lava stone waste obtained from the production residue of natural stone craftsmen in Sambirejo, Prambanan,Yogyakarta.The purpose of this research was to determine the concrete compressive strength, modulus of elasticity of concrete with lava stone wasteas substitute for coarse aggregate, and determine the maximum ratio of lava stone waste as the coarse aggregate in terms of compressive strength andmodulus of elasticity appropriate quality targeted.The method used in this research is the experimental method. Samples form is made as cylinder with 15 cm of diameter and 30 cm of high.Targeted quality of concrete is 25 MPa with lava stone percentage levels of 0%, 20%, 40%, 60%, 80%, 100% replaces the coarse aggregate.The compressive strength of concrete decreased at comparable levels with the addition of lava stone as the coarse aggregate. Value of the averagecompressive strength of concrete at 28 days was 36,768 MPa (lava stone 0%); 31,300 MPa (lava stone 20%); 28,283 MPa (lava stone 40%);27,152 MPa (lava stone 60%); 25,266 MPa (lava stone 80%); and 24,135 MPa (lava stone 100%). Modulus of elasticity was also decreasedlevels comparable to the addition of the lava stone. Average modulus of elasticity value is 22818,000 MPa (lava stone 0%), 18832,333 MPa(lava stone 20%), 16462,333 MPa (lava stone 40%), 15870,667 MPa (lava stone 60%), 15098,000 MPa (lava stone 80%), and13933,333 MPa (lava stone 100%). Concrete qualified targeted quality is lava stone concrete with the maximum level to 80% with averagecompressive strength is 25,266 MPa.