Mineral Analysis On Sediment Load Test Of The Tanjung Bunga Coastal Area Makassar Municipality

Abstract: The Coastal area of Tanjung Bunga, Makassar city is continuously being reclaimed to become a coastal city and has experienced an increasing physical loading. This study aims to investigate the changes found from sediment load test on the beach using CBR Test (California Bearing Ratio) (Fine Sand 2451.36 - 2498.77 kg / cm3, Medium Sand 2015.05 - 2195.57 kg / m3 and Coarse Sand 2460.62 to 2495, 52 kg / m3) shows comparably textural change to the origin. Sampling method of the coastal sediments is acquired using hand bore which is set down up to the depth of 5 meters in 3-point locations, following the profile and direction of sedimentation. Laboratory analysis of the samples used smear slide following method of petrographic analysis of 18 samples covering coarse sand, medium sand and fine sand. The findings give important information on their compositions and shapes. The compositions are quartz minerals ranging from 20 to 25%, hornblende is about 5-20%, 5 to15% pyroxene, plagioclase 5 to 15%, 5 to 15% orthoclase, biotite 10 to 20%, and opaque minerals 10 to 25%. The shapes are as follows, rounded to sub-rounded grain size are coarse sand to fine sand, where the correlation between mineral grains are even on each sample. On the fine sand samples, mineral amount of 80-100% damaged, 14-40% of the mineral are cracked, 15-45% split and 35-43% wrecked, for moderate sand the amount of minerals that are damaged 70-93%, 10-30% mineral cracked, split 18-28%, and 40-57% wrecked. And coarse sand mineral amount of damaged 90-100%, 5-25% minerals cracked, split 15-40% and 50-70% wrecked. We found a relationship between the amounts of damage minerals with value addition of the CBR test. The result shows coarse sand sediments have high values of CBR test with the big number of damaged minerals