Cement is just like the oxygen for majority of the buildings and specially for RCC framed construction.
This article beings forth certain simple field tests which you can carry out yourselves at the site to assess the suitability of the cement .
Basic parameters :
Ordinary Portland cement is available in Grades 43 & 53 whereas Pozzolona Portland cement comes in Grade 33 only ( Although this grade is not printed on the bag for PPC )
Thus , the test results shall indicate the suitability of the cement . The laboratory tests include : Compressive strength , consistency test , residue test etc .This might take more than 28 days to get the results and hence it may not be possible to immediately point out whether or not to use a particular batch of cement at site.
Field tests for cement :
These are derived by the experience of the construction personnel and can give rough indications about the unsuitability of cement .
It is suggested that each site person is familiar with these simple tests so that a quick assessment can be initiated at site it self.
3. Insert the palm inside a cement bag , the cement should feel cool to the palm. If it is cool it is quite alright.
4.Take a little cement in the pinch and rub it by fingers . If the feel is gritty , it means setting has began in the cement.
6. Throw a hand full of cement on the water surface inside the bucket . If the cement floats on surface , the quality is acceptable but if it sinks in the water , it is carrying impurities.
7.Take about 100 gm of cement and make a stiff paste by adding very little water .Form a cake out of this paste and place it on a glass plate. The cake should retain its sharp edges.
Submerge this plate with cake in the water in a bucket .After 24 hours , the cake should not lose its shape and must have attained some strength.