Take a handful of M Sand and rub it between your palms. After rubbing, if your hands are stained grey or feel very dirty, the sand has excessive silt or clay content. Good IS 383 M Sand will leave your hands only slightly dusty. This is the fastest, most reliable field check for silt content.
Fill a jar with about 8cm of M Sand and add water to the top. Shake vigorously and let it settle for an hour. Sand settles at the bottom; silt forms a visible layer on top. If the silt layer is more than 8% of the total depth, the sand exceeds IS 383 limits. For P Sand, there should be no visible silt layer at all.
Good M Sand from hard granite is typically grey to dark grey. Reddish or yellowish tints suggest iron-rich or weathered rock — generally acceptable but worth noting. If the sand is very dark brown or black, or has visible chunks of organic material (roots, soil clumps), reject the load. Good M Sand should look clean, consistent, and angular under close inspection.
Take a small amount of M Sand and heat it on a pan until no steam rises. Weigh before and after — the weight difference is the moisture content. M Sand should have less than 6% moisture content. Excessively wet sand changes your water-cement ratio and weakens the concrete mix. Most good suppliers maintain moisture within acceptable limits.
This is not a physical test, but it is the most important one. Ask your supplier for the EDCAE or BIS-accredited lab test certificate for the batch you are purchasing. The certificate should be recent (ideally within 3 months) and should show all IS 383 parameters passing. Eswara Sand provides this certificate on request for all our M Sand supplies. If a supplier cannot or will not provide this, move on.
குறிச்சொற்கள்