SIFAT SEGAR DAN KUAT TEKAN AWAL SELF COMPACTING CONCRETE DENGAN BAHAN TAMBAH SERBUK BATU BATA MERAH SEBAGAI PENGGANTI SEBAGIAN AGREGAT HALUS
Abstract
The population growth is directly proportional to the need build or renovate houses. The most commonly used building materials in construction are bricks. This research uses red brick powder as pozzolan because it is environmentally friendly and easy to get. The purpose of this research is to know the fresh properties and initial compressive strength in self compacting concrete with the addition of silica fume and powder of brick as substitute of some fine aggregate. Variations of powdered bricks were used by 20%, 40% and 60% of the fine aggregate weight, while the silica fume content was 5% of the weight of the cement. Fresh properties concrete test using slump flow testing method, T500 slump flow, J-ring, L-box and V-funnel. Hard concrete test was performed on compressive strength test at age 3, 14 and 28 days with cylindrical test object size 15 × 30 cm. Based on the results of the research, it is found that the more powdered bricks used, the fresh properties concrete will decrease the workability and the flow rate. The best composition when fresh properties concrete testing is owned by mixture with brick powder substitution of 20%, while the optimum compressive strength is mixed with 60% powder brick substitution with a compressive strength of 20.43 MPa at 3 days, 30.37 MPa at 14 days and 32.47 MPa at 28 days.