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水泥与粉煤灰对多源固体废弃物路面性能的研究

Investigating on the Pavement Performance of Multi-Source Solid Wastes by Cement and Fly Ash.

作者信息

Shan Long, Li Hongbo, Zhao Jing, Zhang Xuanshuo, Kang Xinrui, Gao Xing, Zhou Zhiyao

机构信息

Department of Civil and Hydraulic Engineering, School of Civil and Hydraulic Engineering, Wencui Campus, Ningxia University, Yinchuan 750021, China.

Engineering Research Center for Efficient Utilization of Water Resources in Modern Agriculture in Arid Regions, Yinchuan 750021, China.

出版信息

Materials (Basel). 2023 Oct 4;16(19):6556. doi: 10.3390/ma16196556.

DOI:10.3390/ma16196556
PMID:37834693
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10573841/
Abstract

In order to advance the utilization rate of multi-source solid wastes in the Ningxia region of China, 16 groups of pavement base mixtures were designed with cement and fly ash (FA) as binders, steel slag (SS), silicon manganese slag (SMS), and recycled crushed stone (RCS) as composite aggregates. The evolution laws of mechanical and frost resistance properties of the mixture were investigated by unconfined compressive strength (UCS), indirect tensile strength (ITS), freeze-thaw (FT), and ultrasonic detection tests. Then, the strength formation mechanisms were revealed by microscopic characterization technology. The mathematical models between UCS-ITS, UCS-ultrasonic amplitude, FT cycles-UCS damage, and frost resistance coefficient-relative dynamic elastic modulus were established. The results show that cement content and curing age exhibited a positive effect on the mechanical strength and frost resistance of the mixture. When the replacement rate of SS was 60%, the mechanical strength and frost resistance were preferable. The of the strength relationship models constructed was greater than 0.9, indicating high fitting accuracy. With the extension of the curing age, the cementitious products such as C-S-H (hydrated calcium silicate) and AFt (ettringite) developed entirely, and they were interlocked and cemented with each other, resulting in the micro-morphology developed from the three-dimensional network structure to the dense system. The macroscopic behavior incarnated that the mechanical strength and frost resistance of the mixture were significantly enhanced.

摘要

为提高中国宁夏地区多源固体废弃物的利用率，设计了16组以水泥和粉煤灰（FA）为胶结料，钢渣（SS）、硅锰渣（SMS）和再生碎石（RCS）为复合集料的路面基层混合料。通过无侧限抗压强度（UCS）、间接拉伸强度（ITS）、冻融（FT）和超声检测试验，研究了混合料力学性能和抗冻性能的演变规律。然后，采用微观表征技术揭示了强度形成机理。建立了UCS-ITS、UCS-超声振幅、FT循环次数-UCS损伤以及抗冻系数-相对动弹模量之间的数学模型。结果表明，水泥含量和养护龄期对混合料的力学强度和抗冻性有积极影响。当SS替代率为60%时，力学强度和抗冻性较好。所构建强度关系模型的 大于0.9，表明拟合精度较高。随着养护龄期的延长，C-S-H（水化硅酸钙）和AFt（钙矾石）等胶凝产物充分发育，并相互联锁胶结，导致微观形貌从三维网络结构向致密体系发展。宏观表现为混合料的力学强度和抗冻性显著提高。

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