Mechanical Performance and Drying Shrinkage Characteristics of Solid Waste Based Geopolymer-stabilized Macadam

被引：0
|
作者：
Zhang Y. [1 ]
Tian S.-Q. [2 ]
Ma T. [1 ]
Liu H. [1 ]
Wang A.-P. [1 ]
Huang X.-M. [1 ]
机构：
[1] School of Transportation, Southeast University, Jiangsu, Nanjing
[2] China Road & Bridge Corporation, Beijing
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2023年 / 36卷 / 12期
基金：
中国国家自然科学基金;
关键词：
drying shrinkage; geopolymer-stabilized macadam; mechanical properties; pavement engineering; semi-rigid bases;
D O I：
10.19721/j.cnki.1001-7372.2023.12.009
中图分类号：
学科分类号：
摘要：
The goal of this study was to widen the applications of geopolymers in road engineering and improve the shrinkage properties of traditional cement-stabilized macadam materials using their early strength and good durability. In this study, fly ash and granulated blast furnace slag powder were used as the raw materials for geopolymers, which were prepared under the action of a compound alkali activator. Then, their mechanical properties were analyzed. Furthermore, the effects of different geopolymer dosages on the mechanical properties and drying shrinkages of the geopolymer-stabilized macadam materials were investigated, and a comparative analysis of the properties of traditional cement-stabilized macadam was performed. The findings revealed that the mechanical properties of geopolymer composites vary in response to fluctuations in the fly ash and slag content, as well as the alkali activator modulus. Notably, the strength of the geopolymer was predominantly influenced by the slag. In addition, by using a geopolymer as an alternative to cement in a semi-rigid subgrade base. it was found that the compressive and splitting strengths of the geopolymer-stabilized macadam were better than those of cement- stabilized macadam. In addition, as the geopolymer content increased, the overall drying shrinkage coefficient of the geopolymer-stabilized macadam gradually increased, accompanied by an increase in the water loss rate. However, the strong bond between the geopolymer and macadam, which resisted a further increase in the shrinkage stresses in the internal skeleton, reduced the cumulative coefficient of shrinkage of the geopolymer-stabilized macadam by approximately 9 % compared with the cement-stabilized macadam. This improvement in the dry shrinkage performance offered a notable enhancement to traditional semi-rigid bases. This also significantly enhances the drying shrinkage performance of conventional semi-rigid bases. These findings unequivocally demonstrate the feasibility of employing geopolymers as substitutes for cement in semi-rigid road bases. This study can serve as a valuable reference for the widespread adoption and implementation of geopolymer composites. © 2023 Xi'an Highway University. All rights reserved.
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页码：120 / 130
页数：10
相关论文
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