Compressive strength of concrete using lightweight brick waste as the substitute for fine aggregate

Concrete is one of Indonesia's most widely used construction materials. Thus, the need for concrete materials, mainly sand keeps increasing. Excessive sand mining will harm the environment, causing erosion and landslides. In addition, recent trends in construction have created negative impacts to the nature, such as the dumping of lightweight bricks remnant. This study was conducted to examine the use of lightweight brick waste as a substitute for fine aggregate on the compressive strength of concrete. The design of concrete in this research uses SNI 03 - 2834 - 2002 as the guidelines. The variations are 0%, 10%, 20%, and 30% of lightweight brick waste to replace fine aggregate. This research uses quantitative primary data to obtain the compressive strength of concrete. The tests were held on the seventh, fourteenth, and twenty-eighth day of concrete age, and simple regression analysis was used to determine the effect of weight on the use of brick wastes as a partial substitution of fine aggregate on the compressive strength of concrete. The results show that the maximum and minimum compressive strengths were obtained in variation 10% and variation 30%, which produce the compressive strengths 24.45 MPa and 18.03 MPa at the twenty-eighth day of concrete. Based on the results of the simple regression analysis with SPSS, the use of lightweight brick waste has a significant effect on the compressive strength of twenty-eight day of concrete by 64.8% and the linear regression formula in this test can be written as Y = 24.3-0.170x.