Effect of Curing Temperature on Hydration and Mechanical Properties of UHPC

Abstract

Abstract: The mechanical property and hydration of ultra-high performance concrete (UHPC) are enhanced by heat curing. However, the long-term performance of UHPC has not been studied systematically. The mechanical performance testing, scanning electron microscope (SEM), and X-ray diffraction (XRD) were used to research the long-term mechanical performance and hydration of UHPC after 5 different curing temperatures (20 ℃ standard curing, 90 ℃ steam curing, 120 ℃ dry heat curing, 200 ℃ dry heat curing and 250 ℃ dry heat curing). The test results indicate that the early compressive strength of UHPC is significantly improved by accelerating the hydration, especially the curing temperature exceeding 200 ℃ due to the generation of xonotlite. The influences of different curing temperatures on the long-term strength of UHPC are different. The long-termcompressive strength of UHPC still continues to grow after 90 ℃ steam curing and 120 ℃ dry heat curing, while the long-term compressive strength of UHPC has a significant decrease after 200 ℃ dry heat curing and 250 ℃ dry heat curing. The change of long-term compressive strength mainly depends on the content of remaining unhydrated particles in UHPC after early hydration.

Key words: UHPC, hydration, compressive strength, flexural strength, heat curing, curing temperature

CLC Number:

TU528

LUO Yaoling, YANG Wen, XIE Yuhao, YAN Xinyi, BI Yao. Effect of Curing Temperature on Hydration and Mechanical Properties of UHPC[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 431-438.

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