THE INFLUENCE OF ADDITION CARBIDE WELDING WASTE ON THE COMPRESSIVE STRENGTH OF MORTAR

Abstract

Technological developments in the infrastructure sector are currently being balanced with innovations in the materials that make up concrete. Cement is one of the building blocks of concrete. Cement functions as a bonding agent between aggregates in concrete. The research aimed to determine the influence of additional carbide welding waste on the compressive strength of mortar. The effect of carbide waste as a partial substitute (substitution) and also cement additives in mortar on the strength of mortar planned with SNI 03- 6825-2002 on Portland Cement Mortar Compressive Strength Testing Methods for Civil Works and SNI 03- 6882-2002 on Mortar Specifications for Pair Unit Work through material tests.

Carbide waste has a chemical composition of 60% calcium (CaO), 1.48% SiO2, 0.09% Fe2O3, and 9.07% Al2O3. The main constituent of cement is calcium, which comes from limestone, so in this research, carbide waste is used as a cement substitute. and added materials so that it is hoped that the compressive strength of the mortar will increase when compared to mortar without added materials. The test object used is a cube-shaped mortar with dimensions of 5cm x 5cm x 5cm according to SNI 03- 6882-2014 with a design mix ratio of cement to sand of 1:3 and FAS 0.5. Variations in adding carbide waste: 0%; 0.5%; 1%; 1.5%; 2%; 2.5%; and 3% of cement. Mortar compressive strength tests were carried out at ages 7, 14, 21, and 28 days. The results obtained in this research show that the optimum compressive strength value for using carbide waste as a cement substitute is at a level of 2% with a compressive strength value of 13 MPa, while for carbide waste as a material addition, it is at a level of 0.5% with a compressive strength value of 17.60 MPa.