STUDY OF CONCRETE COMPRESSIVE STRENGTH BY USING CALCIUM CARBIDE WASTE WASTE AS THE SUBSTITUTION OF CEMENT AND SAND GLASS AS SUBSTITUTION

As the development of the construction will also increase the use of cement and sand as a material in concrete mixes, and a variety of ways as well as research continues to be done in order to obtain alternative materials, so that the concrete has economic value and environmentally friendly, to the authors conducted tests using waste carbide as a substitute for cement by 7% and 10% and the waste glass powder as a substitute for sand by 5% and 7.5% in the concrete mix, as well as with the combined use of the two materials is expected to be an alternative material mixed concrete, also reduces the waste that can harm the environment, as well as to can determine compressive strength generated by the material. This research was conducted at the Laboratory of Civil Engineering North Sumatra Muhammadiyah University with methods SNI 03-2834-2000, and quality of concrete plan of 25 MPa. Based on the results obtained from the concrete compressive strength test data, the optimal value in waste carbide variation in the amount of 10%, while the value of optimal variation on glass waste of 7.5%. And the mixture of waste carbide combination of 10%glass waste plus 7.5% increase in the amount of 4.92% at the age of 7 days, amounting to 4.87% at 14 days, and 1.08% at 28 days, compared with normal concrete. This proves that the carbide waste and glass waste can be a substitution of alternative materials cement and sand on a particular variation.