A preliminary study on an effective and simplistic self-healing concept for cement using coarse clinker particles as the healing agent

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

Cement and Concrete Research Pub Date : 2025-03-05 DOI:10.1016/j.cemconres.2025.107859

Jialiang Wang, Min Wu

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Abstract

Effective, low-cost and simplistic self-healing strategies for cement-based systems are attractive. This work proposed a concept where coarse clinker particles were used to replace cement and acted as the healing agent, and the effectiveness was validated by comprehensive studies. The results showed the high potential of the clinker sizes (40–60 μm, 60–90 μm, 0.5–1 mm) and replacement ratios (20–40%) under the studied conditions. For the clinker sized 40–60 μm, the 28d tensile and compressive strength recovery rates achieved 1.12 and 0.91, and the 56d crack sealing width and area reached 300–400 μm and 83.4%–94.4%, which even exceeds conventional autonomous self-healing strategies. The microscopic analyses indicated that larger clinker particles affected reaction kinetics of hydrating particles and improved spatial distribution of the hydration products. By retaining abundant unhdyrated parts and leading to more uniform distribution of the hydration products, the coarse clinker particles significantly improved self-healing properties of the cement mixes.

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以粗熟料颗粒为愈合剂的水泥有效且简单自愈概念的初步研究

有效、低成本和简单的自修复策略对水泥基系统具有吸引力。本工作提出了用粗熟料颗粒代替水泥作为愈合剂的概念，并通过综合研究验证了其有效性。结果表明：在所研究的条件下，熟料粒径（40 ~ 60 μm、60 ~ 90 μm、0.5 ~ 1 mm）和替代率（20 ~ 40%）具有较高的潜力。40 ~ 60 μm熟料28d抗拉、抗压强度恢复率分别为1.12和0.91,56d裂缝封闭宽度和面积分别达到300 ~ 400 μm和83.4% ~ 94.4%，甚至超过了常规的自主自愈策略。微观分析表明，较大的熟料颗粒影响了水化颗粒的反应动力学，改善了水化产物的空间分布。粗熟料颗粒保留了大量未脱水部分，使水化产物分布更加均匀，显著提高了水泥混合料的自愈性能。

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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.