PENGARUH PENGGUNAAN AGREGAT KASAR BETON LIMBAH TERHADAP KUAT TEKAN DAN KUAT TARIK BETON NORMAL

Abstract

Concrete waste is commonly found in several places, including: concrete testing laboratories and demolition of multi-story building structures. The concrete waste increasingly accumulates and potentially disrupts the environment. One way to overcome this problem is recycled into aggregates in a new concrete mixture. The concrete waste can be substituted into concrete mixtures (fine and coarse aggregates) for the manufacture of new concrete. In this study, the concrete waste was used as a mixture material for the coarse aggregate, while the fine aggregate was avoided. To fulfill this requirement, the concrete waste must be crushed using a stone crusher machine, in order to obtain the result of concrete shard according to the aggregate size needed. Physically crude aggregates of the concrete waste resemble nature crude aggregates but have characteristic differences. In this study, a couple of concrete cylinders utilizing a normal compressive strength of concrete of 25 MPa based on the SNI 03-2834-2000 standard. This cylinder was used as a concrete of other compressive strengths of concrete. The other cylinders were substituted with coarse aggregate of the waste concrete having each mixturecomposition of 10% substitution up to 100%, so that the total amount of the mixture composition is 10 variations. Test results of the compressive strength of concrete showed that the 40% coarse aggregates has reach the optimum concrete waste substitution resulting compressive and tensile strength of 31,85 MPa and 3,87 MPa, respectily. It should be noted that higher percentage of coarse aggregates of the waste concrete produces compressive and tensile strength of concrete decreased. The composition of the waste concrete has gradually increased the strength from percentage 30 to 80, the rest compositions have decreased comparing to the normal strengths.