|Table of Contents|

Effect of acid environment on swelling-shrinkage properties of Baise expansive soil and its microscopic interpretation(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2019年01期
Page:
24-32
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Effect of acid environment on swelling-shrinkage properties of Baise expansive soil and its microscopic interpretation
Author(s):
CHANG Jin1;  YANG He-ping1;  XIAO Jie1; 2;  LIU Xiong1;  CHEN Guan-yi1;  MAO Rui1
(1. School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China; 2. Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road and Traffic Safety of Ministry of Education, Changsha University of Science and Technology, Changsha 410114, Hunan, China)
Keywords:
subgrade engineering;  acid environment;  Baise expansive soil;  swelling-shrinkage property;  microstructure;  binding material;  erosion;  leaching
PACS:
U416.14
DOI:
-
Abstract:
The Baise expansive soil in heavy acid rain area of Guangxi was selected as the study subject. To explore the effect of acid rain on the swelling-shrinkage properties of Baise expansive soil, the load-free swelling rate test, swelling force test and linear shrinkage rate test were carried out under different acid conditions(pH values are 3, 5 and 7, respectively). The changes in the microstructure and mineral composition of expansive soil were analyzed through the scanning electron microscopy(SEM)images and X-ray diffraction(XRD)patterns, the microstructures of specimens in SEM images were quantitatively analyzed based on the image processing software Image-Pro Plus(IPP). Research result shows that with the decrease of initial water content, the effect of acid environment on the expansive deformation of specimen increases. When the initial water content decreases from 17% to 9%, the differences of load-free swelling rate between the specimens under different acid environments increase. Comparing with the neutral solution, the increasing ranges of specimen load-free swelling rates soaked in acid solutions with pH values of 3 and 5 grow from 20.6% and 5.6% to 26.9% and 7.0%, respectively. With the decrease of solution pH value, the load-free swelling rates, swelling forces and linear shrinkage rates of specimens increase by stages. Comparing with the neutral solution, the measured load-free swelling rate, swelling force and linear shrinkage rate of specimen soaked in a solution with pH value of 3 increase by 24.3%, 37.5% and 16.9%, respectively. The more acidic the environment, the faster the water evaporation in specimen, and the lower the water content in specimen when it is dehumidified to stable. Both the pore number and size of acid-eroded soil increase with the increase of acidity. The soil porosity increases from 8.7% to 11.9% and 19.4%, respectively, when the solution pH value decreases from 7 to 5 and 3, respectively. The rapid increase of porosity mainly focuses on pore diameter ranging from 3-5 μm. The acid environment decreases the degree of mineral crystallization. Among them, the free colloidal minerals, such as SiO2, Al2O3, K2O, MgO and CaO, show different degrees of erosion and leaching. The erosion of colloidal mineral weakens the structural connection strength between the stacking structures, resulting in the evolution of stacking structure from face-to-face to edge-to-edge. The more acidic the environment, the severer the evolutionary trend, which directly leads to an increase of the swelling-shrinkage deformation of expansive soil. 5 tabs, 12 figs, 29 refs.

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Last Update: 2019-02-28