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Tensile performance of pre-cracked UHPC under the coupled actions of sustained loading and corrosive media
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2024-12-25 , DOI: 10.1016/j.cemconcomp.2024.105915 Yiming Yao, Gan Wu, Kaimeng Yang, Hongrui Zhang, Jianan Qi, Yuqing Hu, Jingquan Wang, Hongyu Zhou
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2024-12-25 , DOI: 10.1016/j.cemconcomp.2024.105915 Yiming Yao, Gan Wu, Kaimeng Yang, Hongrui Zhang, Jianan Qi, Yuqing Hu, Jingquan Wang, Hongyu Zhou
This study investigated the tensile performance of pre-cracked ultra-high performance concrete (UHPC) subjected to sustained loading and various environmental conditions, including air, water, and 3 % NaCl solution. The findings indicated that prolonged tensile loading significantly reduced the tensile properties of UHPC, particularly at higher stress levels. Interestingly, the presence of water and NaCl solution facilitated recovery and, in some instances, even enhanced the mechanical properties of the cracked UHPC specimens beyond their original values. Microstructural analyses using SEM and EDS revealed that hydration products, predominantly C-S-H gel and CaCO3 , improved the bonding between steel fibers and the UHPC matrix. These products effectively filled the cracks and refined the overall microstructure. The results underscored the significant influence of stress levels and environmental exposure on the performance of UHPC in service, highlighting the necessity of considering these factors in the design and application of UHPC to ensure long-term structural integrity and durability.
中文翻译:
预裂解 UHPC 在持续加载和腐蚀介质耦合作用下的拉伸性能
本研究调查了预裂超高性能混凝土 (UHPC) 在持续载荷和各种环境条件(包括空气、水和 3% NaCl 溶液)下的拉伸性能。结果表明,长时间的拉伸载荷显着降低了 UHPC 的拉伸性能,尤其是在较高的应力水平下。有趣的是,水和 NaCl 溶液的存在促进了回收,在某些情况下,甚至增强了裂纹 UHPC 样品的机械性能,使其超过了其原始值。使用 SEM 和 EDS 的微观结构分析表明,水合产物,主要是 CSH 凝胶和 CaCO3 ,改善了钢纤维与 UHPC 基体之间的粘合。这些产品有效地填补了裂缝并完善了整体微观结构。结果强调了应力水平和环境暴露对 UHPC 在役性能的重大影响,强调了在 UHPC 的设计和应用中考虑这些因素以确保长期结构完整性和耐用性的必要性。
更新日期:2024-12-25
中文翻译:
预裂解 UHPC 在持续加载和腐蚀介质耦合作用下的拉伸性能
本研究调查了预裂超高性能混凝土 (UHPC) 在持续载荷和各种环境条件(包括空气、水和 3% NaCl 溶液)下的拉伸性能。结果表明,长时间的拉伸载荷显着降低了 UHPC 的拉伸性能,尤其是在较高的应力水平下。有趣的是,水和 NaCl 溶液的存在促进了回收,在某些情况下,甚至增强了裂纹 UHPC 样品的机械性能,使其超过了其原始值。使用 SEM 和 EDS 的微观结构分析表明,水合产物,主要是 CSH 凝胶和 CaCO3 ,改善了钢纤维与 UHPC 基体之间的粘合。这些产品有效地填补了裂缝并完善了整体微观结构。结果强调了应力水平和环境暴露对 UHPC 在役性能的重大影响,强调了在 UHPC 的设计和应用中考虑这些因素以确保长期结构完整性和耐用性的必要性。