养护温度对UHPC水化及力学性能影响研究

摘要/Abstract

摘要： 热养护能够提高超高性能混凝土(UHPC)的早期力学性能,促使UHPC水化,但对UHPC长期性能的发展尚未有系统深入的研究。通过力学性能测试、SEM和XRD研究了五种养护温度(20 ℃标养、90 ℃蒸汽养护、120 ℃干热养护、200 ℃干热养护和250 ℃干热养护)对UHPC长期力学性能发展以及水化的影响。结果表明,热养护能够促进UHPC早期水化,显著提升UHPC的早期抗压强度,特别是养护温度超过200 ℃时,能够生成明显的硬硅钙石提高UHPC的早期抗压强度。不同养护温度对于UHPC后期抗压强度的影响则不尽相同,90 ℃蒸养和120 ℃干热养护后UHPC试件的后期抗压强度仍然能持续增长,而200 ℃和250 ℃干热养护后试件的后期抗压强度则出现显著降低的趋势,后期抗压强度的变化主要取决于UHPC早期水化后内部剩余的未水化颗粒的含量。

关键词: UHPC, 水化, 抗压强度, 抗折强度, 热养护, 养护温度

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

中图分类号:

TU528

罗遥凌, 杨文, 谢昱昊, 闫欣宜, 毕耀. 养护温度对UHPC水化及力学性能影响研究[J]. 硅酸盐通报, 2021, 40(2): 431-438.

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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