Hydration properties of the composite cementitious materials containing steel slag under steam curing condition

IF 1.4 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Advances in Cement Research Pub Date : 2023-11-17 DOI:10.1680/jadcr.23.00102

Maosen Li, Xiao Liang, Long Chen, Shuhua Liu

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Abstract

Steel slag (SS) is a by-product of steel industry, and its recycling is of great significance. In this study, the influence of SS fineness and curing regimes on the hydration properties of cement and the effects of SS content on the compressive strength of pastes were investigated. The hydration products and microstructure of pastes were further explored through X-ray diffraction (XRD) and Scanning electron microscopy (SEM). The results show that the compressive strength decreases gradually with the increase of SS, and increases with the increase of the specific surface area of SS. The compressive strength of paste after steam curing is improved, and the compressive strength of the paste mixed with 30% SS can reach more than 50 MPa after 90 days of steam curing. The hydration products of paste mixed with SS is not significantly different from that of cement, which is mainly composed of Ca(OH)₂ and C-S-H gel, accompanied by a small amount of CaCO₃. SS has secondary hydration in long-term age and can fill and refine the pore structure, according to SEM. Using SS as supplementary material is beneficial to reducing cement cost and lowering CO₂ emission.

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含钢渣复合胶凝材料在蒸汽养护条件下的水化性能

钢渣是钢铁工业的副产物，其回收利用具有重要意义。研究了SS细度和养护制度对水泥水化性能的影响，以及SS含量对膏体抗压强度的影响。通过x射线衍射(XRD)和扫描电镜(SEM)进一步研究了膏体的水化产物和微观结构。结果表明，抗压强度随SS含量的增加而逐渐降低，随SS比表面积的增加而增加，膏体蒸汽养护后抗压强度得到提高，掺30% SS的膏体经过90天的蒸汽养护后抗压强度可达到50 MPa以上。掺入SS的膏体水化产物与水泥水化产物无显著差异，水泥水化产物主要由Ca(OH)2和C-S-H凝胶组成，并伴有少量CaCO3。扫描电镜显示，SS在长期龄期具有二次水化作用，可以填充和细化孔隙结构。采用SS作为补充材料，有利于降低水泥成本，降低CO2排放。

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来源期刊

Advances in Cement Research 工程技术-材料科学：综合

CiteScore

3.70

自引率

5.00%

发文量

审稿时长

3.2 months

期刊介绍： Advances in Cement Research highlights the scientific ideas and innovations within the cutting-edge cement manufacture industry. It is a global journal with a scope encompassing cement manufacture and materials, properties and durability of cementitious materials and systems, hydration, interaction of cement with other materials, analysis and testing, special cements and applications.