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Reactive transport modelling of autogenous self-healing in cracked concrete
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2024-11-21 , DOI: 10.1016/j.cemconres.2024.107733
Daniel Lahmann, Sylvia Keßler
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2024-11-21 , DOI: 10.1016/j.cemconres.2024.107733
Daniel Lahmann, Sylvia Keßler
Autogenous self-healing can close cracks in water-retaining concrete structures. However, its inconsistent efficiency in building practice indicates that the underlying processes are not fully understood. Therefore, this study characterizes reactive transport through cracked concrete and models it using PHREEQC to develop a comprehensive understanding of chemical processes promoting autogenous self-healing. Driven by the dissolution of portlandite, the main cause of healing is the precipitation of CaCO3 , which contributes to a crack closure of up to 113 μm. This process is supported by the formation of M-S-H and C-S-H. As self-healing progresses, the rates of dissolution and precipitation processes that promote healing decrease exponentially. At initial flow rates >2 L h−1 , CaCO3 precipitation is favored towards the crack outlet. At lower initial flow rates, the formation of CaCO3 shifts towards the crack inlet. These findings underscore the need to reconsider the reliance on effective healing in practical applications.
中文翻译:
开裂混凝土中自愈的反应性输运建模
自体自愈可以闭合保水混凝土结构的裂缝。然而,它在建筑实践中的效率不一致表明,潜在的过程没有被完全理解。因此,本研究表征了通过开裂混凝土的反应性运输,并使用 PHREEQC 对其进行建模,以全面了解促进自体自愈的化学过程。在波特兰石溶解的驱动下,愈合的主要原因是 CaCO3 的沉淀,这导致高达 113 μm 的裂纹闭合。这个过程得到了 M-S-H 和 C-S-H 的形成的支持。随着自我修复的进行,促进愈合的溶解和沉淀过程的速率呈指数下降。在初始流速 >2 L h−1 下,CaCO3 沉淀有利于流向裂纹出口。在较低的初始流速下,CaCO3 的形成会向裂纹入口移动。这些发现强调了重新考虑实际应用中对有效治疗的依赖的必要性。
更新日期:2024-11-21
中文翻译:
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开裂混凝土中自愈的反应性输运建模
自体自愈可以闭合保水混凝土结构的裂缝。然而,它在建筑实践中的效率不一致表明,潜在的过程没有被完全理解。因此,本研究表征了通过开裂混凝土的反应性运输,并使用 PHREEQC 对其进行建模,以全面了解促进自体自愈的化学过程。在波特兰石溶解的驱动下,愈合的主要原因是 CaCO3 的沉淀,这导致高达 113 μm 的裂纹闭合。这个过程得到了 M-S-H 和 C-S-H 的形成的支持。随着自我修复的进行,促进愈合的溶解和沉淀过程的速率呈指数下降。在初始流速 >2 L h−1 下,CaCO3 沉淀有利于流向裂纹出口。在较低的初始流速下,CaCO3 的形成会向裂纹入口移动。这些发现强调了重新考虑实际应用中对有效治疗的依赖的必要性。