The Influence of Temperatures on the Hydration of Cement Paste at the Early Age, and Behaviour of Cement Paste with the Addition of Triethanolamine (TEA) and Triisopropanolamine (TIPA)

This paper intends to examine the influence of temperatures on the early age of cement paste hydration, as well as the setting time and the compressive strength of cement paste with the addition of Triethanolamine (TEA) and Triisopropanolamine (TIPA); hence, the mechanisms of TEA, and TIPA at different curing temperatures were explored. The outcomes show that adding 0.05% and 0.1% TEA, and 0.05% and 0.1% TIPA retarded the setting time of cement pastes; however, this retardation depended on both the dosage and the curing temperature. At 23°C curing temperature, both TEA and TIPA could be used as a hardening accelerator at the dosage of 0.05% by cement weight. Adding 0.05% TEA into the cement paste strongly accelerated the hydration of C3A and increased the early compressive strength, which was more efficient than adding 0.05% and 0.1% TIPA, especially after 8 hours of curing. However, at 50°C curing temperature, as TIPA strongly accelerated the formation of AFt, AFm, CH, using TIPA was more effective than using TEA to enhance the cement paste's compressive strength. These results can offer theoretical direction for the application of cement-based materials adding TEA and TIPA under hot and standard curing temperatures.