Abstract
The hydration kinetics and shrinkage of carbon nanotube (CNT)/cement composites were investigated experimentally. The effect of CNTs mixed in a paste matrix was evaluated in terms of the degree of hydration and heat of hydration to evaluate the overall hydration kinetics. Furthermore, the microstructure and the reaction products were characterized using mercury intrusion porosimetry, X-ray diffraction, and chemical shrinkage for further analysis. Autogenous and dry shrinkages were measured, and the results were analyzed based on the hydration kinetics. The experimental results show that pure CNTs are not capable of activating or delaying the hydration products; rather, they offer a micro-filler capability. In addition, autogenous shrinkage increased despite the amount of added CNTs in some cases.
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