Influence of ultra-fine pozzolanic materials on the self-healing capabilities of ultra-high performance concrete under carbonation conditioning

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement and Concrete Research Pub Date : 2024-11-06 DOI:10.1016/j.cemconres.2024.107712

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Abstract

This work studies the autogenous self-healing of ultra-high performance concrete (UHPC) incorporating two ultra-fine pozzolanic materials, silica fume (USF) and ultra-fine fly ash (UFFA), under carbonation conditioning. Both ultra-fine pozzolanic materials stimulate the healing of cracks by promoting the secondary hydration of the cement matrix. USF and UFFA form healing products primarily consisting of C-S-H and ettringite, respectively, and the latter product closes the cracks more effectively. Under carbonation conditioning, UFFA accelerates CaCO₃ formation with residual uncarbonated ettringites as the structural skeleton, improving the impermeability recovery. USF generates silica gel as a bonding layer between the CaCO₃ crystals and the cement matrix after decalcification, which induces more multi-dimensional cracking upon regenerated structures under flexural reloading, thereby enhancing the mechanical property restoration of UHPC. UFFA-modified UHPC is ideal for applications requiring high impermeability, whereas USF-incorporated UHPC is better suited for scenarios with high load-bearing demands.

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碳化条件下超细沸石材料对超高性能混凝土自愈能力的影响

这项工作研究了掺有硅灰（USF）和超细粉煤灰（UFFA）这两种超细胶凝材料的超高性能混凝土（UHPC）在碳化条件下的自生自愈合。这两种超细水青石材料都能促进水泥基质的二次水化，从而刺激裂缝的愈合。USF 和 UFFA 分别形成主要由 C-S-H 和 ettringite 组成的愈合产物，后者能更有效地封闭裂缝。在碳酸化条件下，UFFA 会加速 CaCO3 的形成，并以残留的未碳酸化的乙长石为结构骨架，从而改善抗渗性的恢复。USF 在脱钙后生成硅胶，作为 CaCO3 晶体与水泥基质之间的粘结层，可在挠曲重载下诱导再生结构产生更多的多维裂纹，从而提高 UHPC 的力学性能恢复能力。UFFA 改性的 UHPC 非常适合要求高抗渗性的应用，而 USF 加入的 UHPC 则更适合高承载要求的应用。

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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.