钙（OPC）和镁（MgO）粘结剂基应变硬化胶凝复合材料（SHCC）的自愈效率

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-03-27 DOI:10.1016/j.cemconcomp.2025.106071

Lei Gu , Dhanendra Kumar , Cise Unluer , Paulo J.M. Monteiro , En-Hua Yang

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引用次数: 0

摘要

本研究考察了水合相组成（由硅酸盐水泥（OPC）和活性镁水泥（RMC）定制）、水胶比（w/b）和养护龄期对应变硬化胶凝复合材料（SHCC）自愈行为的影响。修复效率以刚度恢复和裂缝宽度为表征指标。同时对裂纹断面的形貌、基体和修复产物的化学性质进行了研究，以了解修复产物的特征和潜在的机制。opc基shcc的刚度恢复随龄期的增加而降低，而rmc基shcc的影响不显著。opc基shcc完全愈合的阈值裂缝宽度大于rmc基shcc。由于基质中未反应的水泥含量增加，低w/b比有利于OPC和rmc基shcc的强大自愈。早期裂缝愈合的可能性在所有调查的shcc中都较高。低w/b比的rmc基SHCC，无论复合年龄如何，都能保持其自愈能力。

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Autogenous healing efficiency of calcium (OPC) and magnesium (MgO) binder-based strain-hardening cementitious composite (SHCC)

This study investigated the effects of hydrated phase composition [tailored using Portland cement (OPC) and reactive magnesia cement (RMC), water-to-binder (w/b) ratio, and curing age] on the autogenous self-healing behavior of strain-hardening cementitious composites (SHCC). The healing efficiency was characterized by stiffness recovery and crack width. The morphology of the cracked sections and chemical characterization of the matrix and healing products were carried out simultaneously to understand the characteristics of healing products and underlying mechanisms. The stiffness recovery reduced with increased curing age for OPC-based SHCCs, but the effect was insignificant in RMC-based SHCCs. The threshold crack width for complete healing was larger for OPC-based SHCCs than RMC-based SHCCs. A low w/b ratio is beneficial for robust self-healing in both OPC and RMC-based SHCCs due to increased unreacted cement content in the matrix. The possibility of early-age crack healing was higher in all the investigated SHCCs. The RMC-based SHCC with a low w/b ratio, maintained its autogenous healing capacity irrespective of the composite age.

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.