Which one can’t be the reason for the shrinkage of concrete?

Symptoms for acid attack?

Which of the following compound is used for fine polishing?

It is about ______ times the tensile stress determined by the splitting test.

Cement not more than ____ months old should be used.

Plastic shrinkage cracking occurs in ____ hours after placing.

Evaluation of cracks _____ be determined after cracking.

Compressive strength of hardened concrete is done by _____