I am a Scientist In Testing arena and I was heading Civil Engg Building materials testing Laboratory of National Test House, MoCA, GoI

To ascertain the quality of cement, it has to be tested as per relevant IS code based on the type of cement like 43/53 grade OPC, PPC, Slag cement, Sulphate resistant cement etc. There are many NABL accredited laboratories , you may please check through internet. Superficially, you may ensure good cement by looking at the uniformity of color, without lumps ( very fine by touch); and also by adding the water on a small quantity, you can feel the warmness.

For quality construction, you may have to test it for its conformity.
 
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