DETERMINATION OF METHYLENE BLUE INDEX IN SILICA SAND–CLAY MIXTURES USING ASTM C837-09 Determination of Clay Content Based on the Standard Test Method for Methylene Blue Index (ASTM C83-09)
Keywords:
clay content, pasir silika, clay, metilen biru, ASTM C837-09Abstract
Clay is one of the impurities that can affect the quality of silica sand because it has a high specific surface area and adsorption capacity. The presence of clay in certain amounts can be determined through clay content testing using the methylene blue method. This study aims to analyze the effect of variations in clay content on clay content values in a mixture of silica sand and clay using the ASTM C837-09 method. Samples were made with varying clay content of 1%, 2%, 4%, 6%, 8% and 10%. Each sample was mixed with distilled water and tested using methylene blue solution until it reached the adsorption endpoint which was marked by the formation of a blue halo on the filter paper. The test results showed that increasing clay content caused an increase in clay content values from 0.15 at 1% clay content to 0.70 at 10% clay content. Linear regression analysis produced a coefficient of determination (R²) of 0.9519 which indicates a very strong positive relationship between clay content and clay content values. The results of the study showed that the ASTM C837-09 method can be used to determine the clay content in a mixture of silica sand and clay effectively and provides results that are comparable to the increase in clay content in the sample.
References
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https://doi.org/10.1007/s10311-025-01856-1
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