Acid Test on Building Stones
Acid Test on Building Stone is performed to examine the weathering property of stones
Procedure: In Acid Test, 50-100 gm of stone is taken and placed in a solution of hydrochloric acid having the strength of one percent.
The sample is kept in solution for seven days. The solution should agitate at suitable intervals during Testing of stone or this period.
After the end of the period, the sample is observed. If the sample has sharp edges and surface of the sample does not contain powder, it indicates good quality of building stone.
In other words, if the edges are broken and powder is formed on the surface, it indicates that the stone has poor weathering quality. This shows that stone contains calcium carbonate. This test is generally carried out on sandstone.
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