Tensile properties and self-healing mechanism of pre-cracked UHPC under different curing environments

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-07-15 DOI:10.1016/j.cemconres.2025.107985

Yiming Yao , Xun Lin , Can Chen , Hongrui Zhang , Sijing Chen , Hangyu Zhou , Tianyu Wang , Barzin Mobasher

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Abstract

This study investigates the effects of curing environments, age, and initial crack width on the self-healing performance of pre-cracked UHPC. Direct tensile tests were conducted using crack width as a quantitative index for damage and healing. Results showed significant recovery in tensile strength, with all specimens surpassing the control group after 56 days. Single fiber pull-out tests revealed temperature-dependent interfacial effects: a 60 °C water bath enhanced secondary hydration but also accelerated steel fiber corrosion, altering the failure mode from pull-out to fracture. Microstructural changes were examined via thermal analysis, X-CT, and SEM, confirming that water baths promoted hydration and densification. However, surface crack healing hindered internal hydration by limiting moisture and CO₂ ingress. A multi-scale analysis linked macroscopic tensile recovery to microscopic mechanisms. Additionally, a theoretical model based on hydration kinetics and the Arrhenius equation was proposed to estimate healable crack width, providing predictions that aligned well with experimental data.

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不同固化环境下预裂UHPC的拉伸性能及自愈机制

研究了固化环境、龄期和初始裂缝宽度对预裂UHPC自愈性能的影响。直接拉伸试验采用裂缝宽度作为损伤和愈合的定量指标。结果显示，抗拉强度明显恢复，56天后所有标本均超过对照组。单纤维拔出试验揭示了温度相关的界面效应：60°C水浴增强了二次水化作用，但也加速了钢纤维的腐蚀，改变了从拔出到断裂的破坏模式。通过热分析、X-CT和扫描电镜检查微观结构变化，证实水浴促进了水化和致密化。然而，表面裂纹愈合通过限制水分和CO₂的吸收阻碍了内部水化。多尺度分析将宏观拉伸恢复与微观机制联系起来。此外，提出了一个基于水化动力学和Arrhenius方程的理论模型来估计可愈合裂缝宽度，提供了与实验数据一致的预测。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.