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In this article, we will discuss how to check the quality of cement.
Cement may be prescribed as a material with adhesive and cohesive properties which make it capable of bonding mineral fragments into a compact whole.
For constructional uses, the definition of the word cement is restricted to the bonding materials utilized with stones, sand, bricks, building blocks, etc.
The principal components of this type of cement are made of lime so in building and civil engineering we are concerned with calcareous cement.
The cement of interest in the making of concrete has the property of setting and interest underwater under a chemical reaction with it and is therefore called hydraulic cement.
1. How to Check the Quality of Cement?
Here are the factors that need to be observed to know and check the quality of cement as follows:
a. Packing Date
The manufacturer’s date should be observed on the cement bag. It is necessary because the strength of cement declines with age.
Cement may be defined as a very fine powder that absorbs moistness from the air fast. A tiny quantity of moisture is constantly available in the air, and when the cement bag absorbs this moistness, the initial setting occurs, and the cement slowly fails its strength.
7. Shape Test of Cement
Bring 100g of cement and prepare a stiff paste by putting in some water. Then make a cement cake having sharp edges and put it on a glass plate. Submerge this plate in the bucket containing water on it. Watch that the shape shouldn’t get damaged during settling. Good cement should be capable to form and attain strength in water.
8. Strength Test
Prepare a block of cement 2.5 cm x 2.5 cm and 20 cm long. Submerge the cement block in water for a period of 7 days. Put the submerged concrete block on supports 1500 cm apart and then provide a load with a weight of 340 N. The block which is prepared of good cement should not display any sign of failure.
9. Specific Gravity of Cement
Discovering the specific gravity of cement is of the supreme matter if cement is kept for more than three months in a store. Good quality cement must have a specific gravity (Sg) of around 3.1-3.6gm/cc.
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