Clay is one of the parameters that need to be tested before fine aggregates is used in construction. According to SNI 03-1750-1990, the limit of clay in fine aggregate is 5%. This study aims to determine the clay levels in the sand in Batam City. Clay levels data were analyzed using the one-sample t-test of statistical method. The results of the analysis show that the clay levels in the sand in Batam City is more than 5%, so that the sand in Batam City has not been fully used as fine aggregate for construction.
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