The Substitution of Fine Aggregate with Interlocking Material of Stone Quarry Dust in High Strength Concrete

Abstract

Some of the parameters for improving the quality of concrete are the selection of its constituent materials and compaction process to increase the interlocking between materials. The selection of cubical agregate as fine agregate in the form of stone dust origin from quarry stone residue was chosen as a research object as it is suspected can increase the interlocking material due to its sharp edge. This study aimed to improve the interlocking between material in concrete so as to improve the compressive strength of high strength concrete. The research method is using the standard in SNI 03-6468-2000 (Pd T-18-1999-03) with water cement ratio of 0.3 and 25-50 mm planned slump. Sica viscrocrete - 10 and silica fume was added as additive. The percentage of sica viscrocrete - 10 and silica fume respectively is 1.5% and 10% from cement weight. Dust is used as the substitution of fine agregate. Compressive strength test in this study was performed using 30 cm height and 15 cm width concrete cylinder specimen at 7 and 28 days old. From the test, it was obtained that the compressive strength at 7 days is 53.14 MPa for concrete using natural sand and 52.04 Mpa for concrete using stone dust and at 28 days old is 68.19 MPa for concrete using natural sand and 82.52 MPa for concrete using stone dust. It can be concluded that stone dust as fine agregate substitution can boost more compressive strength of high strength concrete as it has a cubical and sharp plane edge which can help to increase the interlocking between material during the compressive strength test.