FRESH PROPERTIES DAN KUAT TEKAN SELF-FIBER COMPACTING CONCRETE (SFCC) DENGAN BAHAN TAMBAH SILICA FUME DAN SERAT NYLON
Abstract
Self-fiber compacting concrete is fibrous concrete that can compact itself. This concrete is made to overcome problems in the concrete casting process that cannot be reached by a vibrator. This study uses additional material of silica fume as a cement substitute with levels of 0%, 5%, 10%, and 15% which aims to increase the compressive strength of self-fiber compacting concrete. Additional material of nylon fiber with a content of 1% is also added to help increasing the compressive strength of self-fiber compacting concrete, besides that the 1.5% Sikament LN type superplasticizer is used to enhance the workability of self-fiber compacting concrete. The fresh nature of concrete with four testing methods has met the EFNARC standard, namely slump flow, l-box, v-funnel, and T50. The test of compressive strength was carried out at 7, 14 and 28 days of concrete. Based on the test results, self-fiber compacting concrete with a variation of 5% silica fume gives the best compressive strength of 34 MPa. The higher the level of silica fume added to the concrete mixture, the lower the level of workability of the concrete will be. It is because of the fume properties that absorb water.