Abstract
Components of modern cement paste have become more and more complex. A large amount of unhydrated mineral admixture particles, unhydrated cement particles and entrained air play different roles in the thermal deformation of cement paste. To investigate the effects of these components, a dilatometer was adopted to measure the coefficient of thermal expansion (CTE) of hardened cement pastes (HCP) with different water content, water/cement (w/c) ratio and air content values. The effects of cement, fly ash, slag, calcium silicate hydrate (CSH) gel and calcium hydroxide (Ca(OH)2) particles on CTE were also studied after their surfaces had been treated with silicone to prevent reaction with water. The results showed that the CTE of HCP with different components could be listed in descending sequence as calcium hydroxide, fly ash, cement, slag and CSH; the moisture in HCP increased the CTE, while the air entrained decreased it; the increase of the w/c ratio and porosity reduced the CTE, but the longer moisture curing age made it higher.
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