Compressive performance and deterioration mechanism of ultra-high performance concrete with coarse aggregates under and after heating
Compressive performance and deterioration mechanism of ultra-high performance concrete with coarse aggregates under and after heating
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粗骨料超高性能混凝土加热及加热后的压缩性能及劣化机理
DOI：
10.1016/j.jobe.2022.105502
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发表时间：
2022-11
影响因子：
6.4
通讯作者：
Jianqiao Ye
中科院分区：
文献类型：
--
作者：
Congcong Xue;Min Yu;Haoming Xu;Lihua Xu;Mohamed Saafi;Jianqiao Ye
研究了粗集料超高性能混凝土（CA-UHPC）在高温（热态）和高温冷却至室温（冷态）下的宏观抗压强度、形态变化和微观结构。对具有一系列粗骨料比例并经受高达900 °C温度的CA-UHPC试样进行测试和评估。抗压试验结果表明，粗集料的掺入（体积含量≤30%）可以提高CA-UHPC的常温和高温抗压强度。根据试验结果，分别提出了热态和冷态下CA-UHPC的强度折减系数。通过对CA-UHPC材料高温后的质量损失、结构形态、相变和孔隙演化的微观分析，探讨了材料微观结构演化与宏观强度变化之间的温度相关性，以及材料的劣化机理。
This paper studies the macro compressive strength, morphological changes and microstructure of ultra-high performance concrete (UHPC) with coarse aggregates (CA-UHPC) when they are either exposed to high temperature (hot state) or after exposing to high temperature and cooling to room temperature (cold state). CA-UHPC specimens with a range of coarse aggregates ratios and subjected to temperatures up to 900 °C are tested and evaluated. The compressive test results show that adding coarse aggregates (volume content ≤30%) can improve compressive strength of CA-UHPC at both room and high temperature. From the test results, strength reduction coefficients of the CA-UHPC of the hot and cold states are proposed, respectively. The paper also presents the results on the micro scale analyses of mass loss, structure morphology, phase transformation and pore evolution of the CA-UHPC after exposed to high temperature, from which the temperature correlations between the evolution of the microstructure of the material, the change of macroscopic strength, and the deterioration mechanism of the materials are discussed.
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DOI：
10.3390/ma14081827
发表时间：
2021-04-07
期刊：
Materials (Basel, Switzerland)
影响因子：
--
作者：
Li L;Khan M;Bai C;Shi K
通讯作者：
Shi K
影响因子：
7.4
作者：
W. Zheng;Haiyan Li;Ying Wang
通讯作者：
W. Zheng;Haiyan Li;Ying Wang
影响因子：
8.4
作者：
M. Xiong;J. Liew
通讯作者：
M. Xiong;J. Liew
影响因子：
10.5
作者：
Hui Wang;Feiting Shi;Jia-Man Shen;Ai-lian Zhang;Lin-chun Zhang;Huanghuang Huang;Junzhe Liu;
通讯作者：
Hui Wang;Feiting Shi;Jia-Man Shen;Ai-lian Zhang;Lin-chun Zhang;Huanghuang Huang;Junzhe Liu;
影响因子：
10.5
作者：
Le Shen;M. Ding;Kang Chen;Chen Feng;Bo Yang;M. Elchalakani
通讯作者：
Le Shen;M. Ding;Kang Chen;Chen Feng;Bo Yang;M. Elchalakani