Consider the following statements:
I. Specific surface of cement is determined by air permeability method.
II. Le Chatelier's method is used to determine soundness of cement.
III. The total insoluble residue in cement should be less than 1.5 percent.
Which of the above statements is/are correct?
Statement I – Correct: The specific surface or fineness of cement can be determined by the Blaine air permeability
method.
• Statement II – Correct: The Le Chatelier apparatus is used to determine the soundness of cement, particularly
expansion due to excess free lime.
• Statement III – Incorrect: As per IS 269, the permissible insoluble residue for OPC is not 1.5%; the specified limit is
higher than this value.
Reason: As per IS 269: 2015, for Ordinary Portland Cement (OPC 33, 43 and 53 grades), the insoluble residue shall not be more than 5% by mass, not 1.5%. BIS specifically revised this requirement to maximum 5%.Preparing students for success in a changing World.
We care about our students
RPSC-AE, RSMSSB-JE, SSC-JE, RRB-JE, PSU's