Effect of high temperature on mechanical properties of polyethylene fibre-calcium carbonate whisker engineered cementitious composites

IF 6.2 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Developments in the Built Environment Pub Date : 2024-04-01 DOI:10.1016/j.dibe.2024.100462

Xutao Zhang , Xikuan Lyu , Xuwei Zhang , Chao Lou

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Abstract

The mechanical properties of polyethylene fibre reinforced cementitious composites (PE-ECC) and polyethylene fibre-calcium carbonate whisker reinforced cementitious composites (PECW-ECC) were tested after exposure to different temperatures. And the microstructure changes of ECCs were observed by scanning electron microscope. The results showed the compressive and tensile strengths of PE-ECC and PECW-ECC tended to increase and then decrease with the increase of exposure temperature. The incorporation of CW improved the mechanical properties of PE-ECC to a certain extent. At the same exposure temperature, the compressive and tensile strengths of PECW-ECC are better than that of PE-ECC, and the plastic deformation capacity is also better than that of PE-ECC. The reason is that CW can be tightly bonded with the matrix material, and it has a filling effect on matrix defects, a bridging effect on the microscopic cracks, and a deflecting effect on the microscopic cracks.

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高温对聚乙烯纤维-碳酸钙晶须工程水泥基复合材料机械性能的影响

测试了聚乙烯纤维增强水泥基复合材料（PE-ECC）和聚乙烯纤维-碳酸钙晶须增强水泥基复合材料（PECW-ECC）在不同温度下的力学性能。扫描电子显微镜观察了 ECC 的微观结构变化。结果表明，随着暴露温度的升高，PE-ECC 和 PECW-ECC 的压缩强度和拉伸强度呈先增大后减小的趋势。CW的加入在一定程度上改善了PE-ECC的机械性能。在相同的暴露温度下，PECW-ECC 的抗压强度和抗拉强度均优于 PE-ECC，塑性变形能力也优于 PE-ECC。这是因为 CW 能与基体材料紧密结合，对基体缺陷有填充作用，对微观裂缝有桥接作用，对微观裂缝有偏转作用。

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来源期刊

Developments in the Built Environment Multiple-

CiteScore

7.40

自引率

1.20%

发文量

审稿时长

22 days

期刊介绍： Developments in the Built Environment (DIBE) is a recently established peer-reviewed gold open access journal, ensuring that all accepted articles are permanently and freely accessible. Focused on civil engineering and the built environment, DIBE publishes original papers and short communications. Encompassing topics such as construction materials and building sustainability, the journal adopts a holistic approach with the aim of benefiting the community.