采用统一设计的钢渣-矿粉-煤矸石混合物的力学性能和耐久性,用于路面基层

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science Pub Date : 2024-07-08 DOI:10.5755/j02.ms.35705
Fengge Chen, Wenqing Meng, Bingyang Deng, Xin Liu, Hanlong Cui, Shenglei Feng, Yapeng Zhang, Yitong Wu
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引用次数: 0

摘要

为实现工业固体废弃物资源化利用,解决路面材料短缺问题,本文采用钢渣、矿粉和煤矸石制备混合料。设计了一个包含 2 个因素和 6 个水平的统一试验。通过回归分析,建立了煤矸石混合物力学性能的响应曲面。通过 XRD 和 SEM 对不同龄期的水合产物进行了显微分析。研究了包括冻融循环、干湿循环和浸泡膨胀率在内的耐久性。结果表明,混合物的 7d 非压缩强度达到 2.14 - 6.46 MPa,180d 回弹模量为 954 - 1098 MPa,180d 断裂拉伸强度为 0.66 - 0.83 MPa。随着钢渣含量的增加,混合料的 7d 抗压强度先降后升。矿粉含量与 7d 抗压强度呈正相关。随着钢渣和矿粉含量的增加,180d 压缩回弹模量先减小后增大。180d 的劈裂拉伸强度与钢渣和矿粉的含量呈正相关。混合物受冻融循环的影响较小,质量损失率仅为 1.77 %-2.13 %。经过 10 次干湿循环后,外加剂的质量损失率为 0.87 % - 0.99 %,强度略有提高。在水中浸泡 10 d 的混合物的最大膨胀率仅为 0.28 %。钢渣、矿粉和煤矸石之间的水化反应促进了更多水化产物的形成,如 AFt、C-S-H、CaAl2(SiO4) 和 Ca(OH)2。C-S-H和CaAl2(SiO4)交织成致密的网络,包裹着Ca(OH)2,从而提高了混合物的密实度,有效抵抗冻融膨胀应力。钢渣-矿粉-煤矸石混合料符合相关规范的要求,可以很好地用于路面基层。
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Mechanical Properties and Durability of Steel Slag-mineral Powder-coal Gangue Mixture by Uniform Design for Pavement Base
To realize the utilization of industrial solid waste resources and solve the shortage problem of pavement materials, this paper uses steel slag, mineral powder, and coal gangue to prepare a mixture. A uniform test with 2 factors and 6 levels was designed. Through regression analysis, response surfaces were established to study the mechanical properties of the coal gangue mixture. The hydrated products at different ages were microscopically analyzed by XRD and SEM. The durability including freeze-thaw cycles, dry and wet cycles, and immersion expansion rate were researched. The results show that the 7d unconfined compressive strength of the mixture reaches 2.14 – 6.46 MPa, with a 180d resilience modulus of 954 – 1098 MPa, and a 180d splitting tensile strength of 0.66 – 0.83 MPa. With the increase of steel slag content, the 7d unconfined compressive strength of the mixture first decreases and then increases. The content of mineral powder is positively correlated with the 7d unconfined compressive strength. The 180d compressive resilience modulus decreases first and then increases with the increase of steel slag and mineral powder content. The 180d splitting tensile strength is positively correlated with the content of steel slag and mineral powder. The mixture is less affected by freeze-thaw cycles, with mass loss rates of only 1.77 % – 2.13 %. The mass loss rate of the admixture is 0.87 % – 0.99 % after 10 dry and wet cycles, and the strength is slightly improved. The maximum expansion rate of the mixtures immersed in water for 10d is only 0.28 %. The hydrated reaction between steel slag, mineral powder and coal gangue promotes the formation of more hydration products such as AFt, C-S-H, CaAl2(SiO4), and Ca(OH)2. The C-S-H and CaAl2(SiO4) are intertwined into a dense network to wrap Ca(OH)2, which improves the compactness of the mixture and effectively resists the freeze-thaw expansion stress. The steel slag-mineral powder-coal gangue mixture meets the requirements of relevant norms and can be well used in pavement bases.
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来源期刊
Materials Science
Materials Science 工程技术-材料科学:综合
CiteScore
1.60
自引率
44.40%
发文量
63
审稿时长
4-8 weeks
期刊介绍: Materials Science reports on current research into such problems as cracking, fatigue and fracture, especially in active environments as well as corrosion and anticorrosion protection of structural metallic and polymer materials, and the development of new materials.
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