Pore structure formation and hydration characteristics of cement paste with temperature rising inhibitor

Abstract

The early-age thermal cracking easily generates and severely impairs the durability of concrete. The temperature rising inhibitor (TRI) was utilized to regulate the temperature evolution by controlling the cement hydration process. This paper aimed to investigate the pore structure formation and hydration characteristics of cement paste containing TRI by low-field nuclear magnetic resonance. The experiment showed that the T₂ peak of cement paste shifted from 7.32 ms to 0.23 ms regardless of TRI addition. But the pattern of pore structure formation was changed with TRI addition, that is, the pore structure formation was delayed, and the pore successively shifted to left in two parts. In addition, TRI addition significantly prolonged the duration of gel pore formation and greatly decreased the increase rate of gel water, which implied that TRI introduction hindered the growth of C-S-H, and subsequently decreased the hydration rates and delayed the main hydration peak. Meanwhile, TRI dissolved and diffused rapidly at 40 °C, delaying the hydration of cement paste seriously. Moreover, TRI brought about the C-S-H nucleation homogeneous and the ion concentration uniform, which might reduce the localized curvature occurring on the sheet of C-S-H, and then decreased the T₂ intensity of capillary water and gel water.

Keywords

pore structure formation / hydration characteristics / temperature rising inhibitor / low-field nuclear magnetic resonance / cement paste

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