Title:
Cement Chemical Shrinkage as Measure of Hydration Kinetics and Its Relationship with Nonevaporable Water
Author(s):
Xueyu Pang and Christian Meyer
Publication:
Materials Journal
Volume:
109
Issue:
3
Appears on pages(s):
341-352
Keywords:
chemical shrinkage; curing pressure; gel water; hydration kinetics; nonevaporable water; specific volume.
DOI:
10.14359/51683825
Date:
5/1/2012
Abstract:
The hydration kinetics of portland cement can be monitored continuously by measuring its chemical shrinkage during hydration. In addition to serving as an alternative tool to study cement hydration mechanisms, this relatively new technique is particularly helpful in evaluating the effect of curing pressure on hydration, which cannot be directly measured using traditional isothermal calorimetry devices. To convert cement chemical shrinkage test results to degrees of hydration information, an important parameter—namely, the total chemical shrinkage of cement at the complete hydration condition—has to be determined. A multi-linear model is proposed in this study to estimate such a parameter for different cements based on estimated nonevaporable water content and its specific volume. Application of this model is demonstrated using chemical shrinkage test results of a neat Class H cement cured at different pressures ranging from 100 to 7500 psi (0.69 to 51.7 MPa).