Abstract
Rate of mineral deterioration in Tanjung Bunga Beach, Makassar city sediment, as a coastal city area that temporarily evolved with infrastructure development, through a Compaction test has found damage mineral from cracks, split and shatter. The aim of this research is to classify the compaction test from mineral as result texture breakage from compression test. Tanjung Bunga beach sediments based on grain size was classified from fine sand, medium sand and coarse sand. Petrographic analysis of 15 samples of in three drilling sites with 5 meters depth, found quartz mineral composition from 20 – 25%, hornblende bertween 5 – 20%, pyroxene 5 – 15%, pagioclast 5 – 15%, orthoclast 5 – 15%, biotite 10 – 20%, and opaque minerals 10 – 25%. Value of Compaction Test laboratory Fine Sand has 4 - 14.4 Div, Medium Sand has 6.7 - 20 Div, and Coarse Sand has 3.2 - 24 Div. Petrographic analysis after Mineral Compaction Test on fine sand was cracked up to 2 – 20%, split 2 – 12%, and shattered 2 – 10%, medium sand was cracked mineral up to 2 – 15%, split up to 1 – 13%, and shattered up to 1 – 5%, and coarse sand up to 1 – 10% cracked minerals, split up to 2 – 15%, and shattered up to 2 – 7%. High percentage of crack minerals were found in fine sand with low Compaction Test values and coarse sand with low crack mineral and high Compression Strength values. More cracked mineral was found in Quartz and no opaque minerals were shatter. Mineral pyroxene is founded as most shatter shape and orthoclase mineral with the most split shape.
Highlights
Tanjung Bunga beach area, Makassar area in development concept of "Water Front City", is part of "Waterfront Development" as development concept of coastal area with the construction of settlements infrastructure and coastal tourism
Tanjung Bunga beach, characterized as spit beach were changing in gradual, vertical sediment composed by coastal sediment and a thickly fluvial-deltaic layer, a resistivity of 0.1 - 402 Ohm m, with value of 1.3 Ф - 2.4 Ф, Coastal topography is relatively sloping and affected by the tides
In this study used 15 sediment samples at 3 points, which generally show the damage as well as changes size and shape surfaces of minerals from rupture, split to shattering, which is found on sediment samples of fine sand, medium sand and coarse sand
Summary
Tanjung Bunga beach area, Makassar area in development concept of "Water Front City", is part of "Waterfront Development" as development concept of coastal area with the construction of settlements infrastructure and coastal tourism. The burden in coastal sedimentary area may damage the minerals, change size and shape of minerals that will reduce the ability, formation strength of land, and coastal area functions. Coastal plain of Tanjung Bunga is part of the Jeneberang River, containing minerals which are Quartz, Hornblende, Pyroxene, Orthoclase, Plagioclase, Biotite, and Opaque minerals in larger quantities than other minerals, with sizes from fine to coarse sand and rounded to sub rounded shape [3]. In this study used 15 sediment samples at 3 points, which generally show the damage as well as changes size and shape surfaces of minerals from rupture, split to shattering, which is found on sediment samples of fine sand, medium sand and coarse sand
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