Properties and Hydration Mechanism of Lime-Based Slag‑Steel Slag Composite Cementitious Materials

被引：0
作者：
Wang, Ying [1 ,2 ,3 ]
Gu, Xiao-Wei [1 ,2 ,3 ]
Wang, Qing [1 ,2 ,3 ]
Xu, Xiao-Chuan [1 ,2 ,3 ]
机构：
[1] School of Resources ＆ Civil Engineering, Northeastern University, Shenyang
[2] Liaoning Institute of Technological Innovation in Solid Waste Utilization, Shenyang
[3] Science and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang
来源：
Dongbei Daxue Xuebao/Journal of Northeastern University | 2024年 / 45卷 / 10期
关键词：
hydration mechanism; lime; mechanical property; slag‑steel slag composite cementitious material; working performance;
D O I：
10.12068/j.issn.1005-3026.2024.10.012
中图分类号：
学科分类号：
摘要：
To analyze the properties and hydration mechanism of lime‑based slag‑steel slag composite cementitious materials,discussions are conducted on the mechanical properties and working performance of the composite cementitious materials with different steel slag and lime mass fraction. Furthermore,detection methods such as XRD are employed to explore the hydration mechanism of the composite cementitious materials. The research results indicate that the optimal steel slag content in lime‑based slag‑steel slag composite cementitious materials is 30%. The compressive strength is 32. 3 MPa after 28 d of maintenance. The primary hydration products of the composite cementitious materials are C-(A)-S-H gel,hydrocalumite, Ca(OH)2,and calcite,among which the interlocking C-(A)-S-H gel provides the primary compressive strength for the composite cementitious materials. When the steel slag content in the composite cementitious materials ranges from 20% to 30%,it does not significantly affect the formation of C-(A)-S-H gel in the cementitious materials and can promote the hydration of slag. An appropriate amount of steel slag exhibits a filling effect,reducing microcracks in the composite cementitious materials, making the matrix more compact, and enhancing the mechanical properties of the composite cementitious materials. © 2024 Northeast University. All rights reserved.
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页码：1459 / 1468
页数：9
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