钢渣块中碳化诱导粘结：预碳化和钙共生长的影响

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-05-09 DOI:10.1016/j.conbuildmat.2025.141690

Qifeng Song , Yi Jiang , Mingyang Zhang , Tung-Chai Ling , Ming-Zhi Guo

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引用次数: 0

摘要

研究了预碳化和钙共生长对钢渣粘结剂与骨料在碳化硬化砌块中粘结行为的影响。钢渣骨料表面预碳化形成碳化层，尽管总碳酸钙（Cc）析出量增加，但阻碍了粘结剂与骨料的有效结合。因此，由于多孔界面过渡区（ITZ）的形成，碳化块体表现出相对较低的抗压强度。有趣的是，预碳化层和松散的ITZ有利于钙离子和碳酸盐的储存，有利于在碳化固化后的后续环境固化过程中产生二次Cc沉淀，从而使ITZ致密并增强键合。这些改进促进了实力的持续增长。相比之下，含有原钢渣骨料的砌块由于粘结剂和骨料同时碳化而表现出良好的粘结性，形成了更致密的ITZ。这是由于在碳化固化过程中，钙从界面水膜中的团聚体和粘结剂中溶解而来，从而导致ITZ更加均匀，强度更高。

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Carbonation-induced bonding in steel slag blocks: Effect of pre-carbonation and calcium co-growth

This study investigated the effects of pre-carbonation and calcium co-growth on the bonding behavior between steel slag binder and aggregate in carbonation-hardened blocks. The surface pre-carbonation of steel slag aggregates formed a carbonation layer, which hindered the effective bonding between the binder and the aggregate despite an increase in the amount of total calcium carbonate (Cc) precipitation. As such, the carbonated blocks exhibited a relatively low compressive strength due to the formation of a porous interfacial transition zone (ITZ). Interestingly, the pre-carbonation layer and the loose ITZ facilitated the storage of calcium ions and carbonate species, which favored secondary Cc precipitation during the subsequent ambient curing after carbonation curing, thereby densifying ITZ and enhancing bonding. These improvements contributed to a continuing strength growth. In contrast, the blocks incorporating raw steel slag aggregate exhibited a superior bonding due to the concurrent carbonation of both binder and aggregate, forming a more compact ITZ. This was attributed to the calcium co-growth dissolved from both the aggregates and the binder in the interfacial water film during carbonation curing, leading to a more uniform ITZ and higher strength.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.