This paper presents the local matrial research supported by the testing lab so expect their analysis of the use of concrete quality k - 250 by using existing matrial at Borneo east. In the world of building this east at Borneo stout uses outside matrial for a good quality of concrete so that local matrial little use because the local matrial not good enough to use so I want to know and test the quality of the local matrial longiram coral and sand Mahakam in East Borneo.
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