Variation of Early Age Autogenous Shrinkage with Ph of Water at Elevated Temperature

For structural design and rather insufficiently treated in standards, it is complicated to control the early age shrinkage and is a great challenge to determine the properties involved for the volume changes. Early age shrinkage lies in drying, thermal and autogenous stages. Autogenous shrinkage of cement paste is the macroscopic volume change occurred if no moisture transfers to the exterior surrounding environment. The main motto of this paper is to evaluate the effect of pH of water on the early age autogenous shrinkage of cement paste at elevated temperature. The experimental setup has been performed in twelve special type glass bottles, where four different types of Portland and ordinary Portland cement are taken maintaining the pH of water 5,7,10 respectively. Besides measuring the effect of pH on early age autogenous shrinkage, the effect of temperature also investigated. For investigate the temperature effect the experiment was performed at 40°C temperature. It is observed that the early age autogenous shrinkage of cement paste is greater for lowering pH (5) means for acidic water and its value is abridge for greater pH(10) means for alkaline water. It is also investigated that if temperature increases than the shrinkage value also increases. Therefore, this paper gives idea to predict the early age autogenous shrinkage with a variation of pH of water for different cement at 40°C and comparative performances of cement.