Effect of sub-elevated temperature on mechanical properties of ECC with different fly ash contents
Effect of sub-elevated temperature on mechanical properties of ECC with different fly ash contents
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低温对不同粉煤灰掺量ECC力学性能的影响
DOI：
10.1016/j.conbuildmat.2020.120096
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发表时间：
2020-11
影响因子：
7.4
通讯作者：
Liqun Yuan
中科院分区：
文献类型：
--
作者：
Zhigang Zhang;Jin-Cheng Liu;Xiaoqing Xu;Liqun Yuan
本文系统研究了两种不同粉煤灰掺量的工程水泥基复合材料（ECC）在亚高温下的多尺度力学性能。在复合材料水平上，对经受20 °C、50 °C、100 °C和200 °C暴露的试样进行单轴压缩和拉伸测试。结果表明，随着温度从20 °C升高到200 °C，两种ECC混合物的抗压强度由于基体孔结构的细化而增加。在拉伸性能方面，暴露于100 °C和200 °C后，具有相对较低粉煤灰含量的ECC Ml显示出应变能力的大幅降低，但仍保持应变硬化行为，而具有较高粉煤灰含量的ECC M2显示出相当或甚至增强的拉伸强度和应变能力。在微观尺度上，ECC基体韧性增加，PVA纤维强度在200 °C暴露下降低，这劣化ECC的拉伸性能。然而，由于纤维/基质界面结合的减少，上述负面影响被减弱。此外，与高粉煤灰含量相关的相当低的基体韧性和纤维/基体界面结合是亚高温暴露后ECC M2保留高度延展性的主要原因。
In this paper, the mechanical properties of Engineered Cementitious Composites (ECC) with two different fly ash contents after sub-elevated temperature exposure were investigated systematically at multiple scales. At composite level, uniaxial compressive and tensile tests were performed on specimens underwent 20 °C, 50 °C, 100 °C, and 200 °C exposure. The results indicate that, as temperature rise from 20 °C to 200 °C, the compressive strength of both ECC mixtures increased due to the refinement of the matrix pore structure. In term of tensile properties, after exposed to 100 °C and 200 °C, ECC M1 with relatively lower fly ash content shows a substantial reduction in strain capacity, but still retaining strain-hardening behavior, whereas ECC M2 with higher fly ash content exhibits a comparable or even enhanced tensile strength and strain capacity. At micro-scale, ECC matrix toughness was increased and PVA fiber strength was degraded under 200 °C exposure, which deteriorates the tensile properties of ECCs. However, the above negative effects are diminished due to the reduced fiber/matrix interfacial bond. Furthermore, the rather low matrix toughness and fiber/matrix interfacial bond associated with high fly ash content are the main reasons for the highly remained ductility in ECC M2 after sub-elevated temperature exposure.
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影响因子：
10.5
作者：
Erdem, Tahir Kemal
通讯作者：
Erdem, Tahir Kemal
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影响因子：
1.8
作者：
Hailin Lu;Jing Hao;Jiwei Zhong;Yafei Wang;Hongyin Yang
通讯作者：
Hongyin Yang
影响因子：
11.4
作者：
Kumar, R;Bhattacharjee, B
通讯作者：
Bhattacharjee, B
DOI：
--
发表时间：
1999
期刊：
--
影响因子：
--
作者：
Z. Lin;T. Kanda;V. Li
通讯作者：
Z. Lin;T. Kanda;V. Li
影响因子：
1.7
作者：
Mo Li;V. Li
通讯作者：
Mo Li;V. Li