Though it is difficult to examine all the properties of cement, but there are some elementary field tests which provide a rough idea about the quality of cement.
Given below, the detailed lists of simple tests which can be easily accomplished devoid any equipment to determine the cement quality. These elementary tests involve examining the properties of cement upon which the strength and quality of Cement depend.
1. Date of Packing (MFG Date): It is found that the strength of the cement decreases as time passes. According to IS Specifications, cement should be reexamined if it is preserved in excess of three months in the mill.
The percentage of strength loss for various time gapping is provided below.
From the above mentioned table, it is found that the strength of cement is reduced over a period of time.
2. Colour of Cement: The color of cement should have been consistent. Grey containing a light greenish shade is considered as a standard color of cement. The quantity of surplus clay or line is determined with cement color.
3. Check for lumps: If moisture exists in cement, lumps may develop. Cement endures a chemical reaction if it gets in touch with the atmospheric moisture and it is called as hydration. Moisture is very harmful for cement. Cement becomes ineffective as soon as it is hydrated with water (liquid form or vapour form)
4. Rubbing Test: Choose a bit of cement rub within your fingers, if it remains smooth at the time of rubbing, the quality of cement is good. But if it is rough, it signifies that cement is blended with sand.
5. Float test of cement: Choose a bit of cement and put it in water, a good quality of Cement should be submerged and should not float on water.
6. Hand insertion: Put your hand into the cement bag. It you get cool feeling, then there is no hydration reaction in cement bag.
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