|Table of Contents|

Swelling and shrinkage characteristics of high content phosphogypsum stabilized red clay(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年02期
Page:
150-159
Research Field:
岩土工程
Publishing date:

Info

Title:
Swelling and shrinkage characteristics of high content phosphogypsum stabilized red clay
Author(s):
CHEN Kaisheng;  LUO Dipu;  HU Xing
(College of Civil Engineering, Guizhou University, Guiyang 550025, Guizhou, China)
Keywords:
improved soil;  phosphogypsum;  cement;  red clay;  swelling and shrinkage characteristic
PACS:
TU446
DOI:
10.19815/j.jace.2021.11002
Abstract:
In order to study the swelling and shrinkage deformation characteristics of high content phosphogypsum stabilized red clay, changing the previous research idea of using phosphogypsum and cement as external stabilizer to improve soil, phosphogypsum and red clay were used as main raw materials, the specimens with the cement content of 5% and the ratio of phosphogypsum to red clay 1:1, 1:2 and 1:3 were made. The swelling and shrinkage deformation characteristics of plain red clay and phosphogypsum stabilized red clay under different water content and compaction degree were carried out. The results show that the absolute expansion rate of plain red clay increases linearly in 0-3 h, and reaches stable after 3 h. The absolute expansion rate of phosphogypsum stabilized red clay slowly increases in 0-3 h, and the deformation is less than that of plain red clay. After 3 h, the deformation of phosphogypsum stabilized red clay continues to increase, and exceeds that of plain red clay in about 2 d, showing greater expansibility, and the expansion stability time is about 10 d. The absolute expansion rate of phosphogypsum cement-stabilized red clay mixture has a lag effect compared with the expansion deformation of plain red clay. The addition of phosphogypsum and cement can effectively reduce the expansion deformation of the mixture in the early stage, and under the same water content, the lower the content of phosphogypsum, the greater the absolute expansion rate. The lower the initial water content of phosphogypsum stabilized red clay, the greater the absolute expansion rate. The linear shrinkage of phosphogypsum stabilized red clay and plain red clay increases with the increase of water content and compaction degree. The horizontal shrinkage increases with the increase of water content and decreases with the increase of compaction degree. At the same moisture content and compaction, the linear shrinkage of phosphogypsum cement stabilized red clay is greater than that of plain red clay, and the horizontal shrinkage is less than that of plain red clay. The 7 d unconfined compressive strength of high content phosphogypsum stabilized red clay can meet the requirements of the specification for the strength of cement stabilized materials for the subbase of class II and below highways, but its expansion deformation is large and the stability time is long. It is suggested that further research should be carried out to reduce the expansion deformation of cement phosphogypsum stabilized red clay by adding additives.

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Last Update: 2023-03-20