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Corresponding Author

:陈开圣,男,博士,教授,博士生导师.E-mail:32084046@qq.com

Abstract

In response to the waste of phosphogypsum resources and engineering characteristics of red clay, by referring to the mix ratio design method of fly ash mixtures, 18 sets of mix ratio samples were set up indoors. By conducting compaction tests, seven-day unconfined compression strength tests, water-stability tests, and CBR tests, exploratory research was conducted on the road performance of high content phosphogypsum stabilized red clay. The results indicate that the optimal water content of high content phosphogypsum stabilized red clay is lower than that of plain red clay. The seven-day unconfined compression strength is 1.8-3.7 times that of plain red clay. After soaking for 24 hours, the strength loss reaches over 50%, with overall poor water stability. Water glass can enhance the water stability of phosphogypsum stabilized soil. As the content of phosphogypsum grows, the water stability coefficient also increases. The CBR value of high content phosphogypsum stabilized red clay is far greater than that of plain red clay, which can meet the requirements of the CBR value of roadbed fillers on expressways and first-class highways. By considering the strength and water stability requirements of the roadbed and starting from the perspective of reducing cement content and increasing phosphogypsum content, it is recommended to adopt 4% cement, 2% sodium silicate, and a phosphogypsum-clay ratio of 1:1.

Publication Date

8-18-2022

DOI

10.14048/j.issn.1671-2579.2022.04.034

First Page

185

Last Page

191

Submission Date

May 2025

Reference

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