Volume :

2

Issue :

1

Abstract :

Autogenous shrinkage of cement pastes both for early and later ages cause cracks in many cases because of improper setting. Since early age autogenous shrinkage normally considered as the time of 24 hours just after mixing water and without any moisture migration, it is really difficult to measure the early age properties. Because in this stage cement paste stands as semi liquid and starts to hardening. However in this stage there occurs considerable volume change due to autogenous shrinkage. The aim of this work is to investigate this shrinkage of cement paste at constant temperature and humidity for ordinary Portland cement and Portland composite cement using treated water with a non destructive technique. Also the performances for both cement was investigated using acidic, alkaline & mineral water. The non destructive experimental setup has been performed in six special type glass bottle, where three for ordinary Portland cement and rest for Portland composite cement maintaining the pH of water 5,7,10 respectively. And it has been investigated that besides composition of cement, pH of water also largely influences the shrinkage value in early stage. Also from the fineness of cement paste these shrinkage value is compared. It is observed that lowering the pH of water the performances of cement paste decreased for both cement. And the Portland composite cement shows greater shrinkage than ordinary Portland cement. Also with increasing fineness of cement shrinkage also increased. Therefore, this paper provides insight regarding how to interpret early age autogenous shrinkage, how treated water play a role, and comparative analysis of shrinkage in the early age.