Welcome to Visit BULLETIN OF THE CHINESE CERAMIC SOCIETY! Today is

BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2021, Vol. 40 ›› Issue (2): 431-438.

Special Issue: 水泥混凝土

• Cement and Concrete • Previous Articles     Next Articles

Effect of Curing Temperature on Hydration and Mechanical Properties of UHPC

LUO Yaoling, YANG Wen, XIE Yuhao, YAN Xinyi, BI Yao   

  1. China West Construction Academy of Building Materials Co., Ltd., Chengdu 610015, China
  • Received:2020-08-26 Revised:2020-10-22 Online:2021-02-15 Published:2021-03-10

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: