COMPRESSIVE STRENGTH STUDY OF STRUCTURAL LIGHT WEIGHT CONCRETE WITH CANE GRASS ASH, PUMICE SAND, AND STONE ASH UTILIZATION

Abstract

In this modern era, the development of civil engineering has progressed very rapidly and intensively the development of existing infrastructure in Indonesia. As construction work increases, the need for concrete continues to increase, research in the field of concrete continues to be carried out. Therefore, concrete innovation is required to answer challenges, is environmentally friendly and low weight. Along with the limitations of lightweight concrete properties, therefore this study used bagasse ash, pumice sand and rock ash. The method used is experimental. This study made 2 variations of mix design using pumice levels of 50% and 60% as many as 8 pieces per variation with a test age of 7, 14, 21, and 28 days. The optimum yield that can be obtained from bagasse ash and rock ash is 10% of the total cementitious and 20% of the volume of fine aggregate. The compressive strength produced by the BR-50% mix design variation aged 7, 14, 21 and 28 days is 30.25 MPa, 27.71 MPa, 33.44 MPa and 36.31 MPa aged 28 days. While the compressive strength produced by the BR-60% mix design variation is 31.21 MPa, 29.62 MPa, 35.67 MPa, and 38.22. The cost needed to make a variation of BR-60% is Rp. 784,573 while the cost of conventional concrete is Rp. 835,363 so that the difference between the price of conventional concrete and innovative concrete is Rp. 49,991.