Effect of Temperature Rise Inhibitor on Temperature Control and Deformation Properties of Concrete with Calcium and Magnesium Oxides Based Expansive Agent

doi:10.16552/j.cnki.issn1001-1625.2024.1456

Abstract

Abstract: In order to reduce the risk of cracking of high strength mass concrete due to significant early self-shrinkage and temperature drop shrinkage, the effect of temperature rise inhibitor (TRI) dosage on the hydration heat release process, setting time and mortar strength of pure cement and cement-7% (mass fraction) calcium and magnesium oxides based expansive agent (CMEA) composite cementitious materials were studied, and the effect on the adiabatic temperature rise and deformation properties of concrete with 7%CMEA was also investigated. The results show that the increase of TRI dosage can reduce the early hydration heat release rate, heat release and early strength of pure cement and cement-7%CMEA composite cementitious materials, and prolong the setting time, but it has little effect on the late strength. After adding 0.20% (mass fraction) TRI, the 1 d cumulative heat release of CMEA cement decreases by 26.7%, and the 1 d adiabatic temperature rise of CMEA concrete decreases by 31.1%. In addition, the expansion deformation peak value of CMEA concrete increases by 288 με in the temperature rise stage compared with 0.15%TRI, and the shrinkage deformation decreases by 7.2% in the temperature drop stage, which is more conducive to reducing the early concentrated heat release of high strength mass concrete and improving its crack resistance.

Key words: high strength concrete, temperature rise inhibitor (TRI), calcium and magnesium oxides based expansive agent (CMEA), hydration process, adiabatic temperature rise, volumetric deformation

CLC Number:

TU528

SUN Haojie, LI Beixing, JI Xiankun, CHENG Fuxing, ZHANG Dengke. Effect of Temperature Rise Inhibitor on Temperature Control and Deformation Properties of Concrete with Calcium and Magnesium Oxides Based Expansive Agent[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 2079-2088.

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