Show simple item record

contributor authorDongxing Wang
contributor authorYiying Du
contributor authorLeena Korkiala-Tanttu
contributor authorZengfeng Zhao
date accessioned2022-01-30T21:46:45Z
date available2022-01-30T21:46:45Z
date issued11/1/2020 12:00:00 AM
identifier other%28ASCE%29GM.1943-5622.0001835.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4268824
description abstractAcid/alkali contamination of expansive soils, which has been probed in recent years, gives rise to unexpected structural failure when exposed. However, a systematic research aiming at evaluating volumetric behavior of natural illitic clays when subjected to acid/alkali solution as pore fluid and its microlevel analysis is not well established. A series of oedometer tests and microanalytical experiments (X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy) have been carried out to investigate the effects of acid and alkali contamination on swelling and compressibility of natural expansive clays from Heilongjiang province in China and to identify the underlying controlling mechanisms. Distilled water, sulfuric acid of pH 3, and caustic soda of pH 13 were selected as three different pore fluids. The results show that compared to samples inundated with water, specimens exhibit greater swelling and lower compressibility after being exposed to acid solution, and lower swelling and greater compressibility after being subjected to alkali solution. In three different soaking solutions, all samples present an increasing tendency for swelling deformation with dry density from 1.4 to 1.8 g/cm3, while the highest compressibility occurs at dry density around 1.5 g/cm3. The microanalysis revealed that soils undergo reactions, including desiliconization and cation exchange, due to the acid and alkali erosion, which correspondingly leads to changes in soil mineralogy and texture. Acid and alkali contamination results in disintegration and loose structure, and acid exerts more destructive impacts than alkali do. The sulfuric acid promoted the dissolution of tetrahedral cations, while the caustic soda improved the dissolution of octahedral cations.
publisherASCE
titleVolume Change Behavior of Natural Expansive Soils Subjected to Acid and Alkali Contamination
typeJournal Paper
journal volume20
journal issue11
journal titleInternational Journal of Geomechanics
identifier doi10.1061/(ASCE)GM.1943-5622.0001835
page10
treeInternational Journal of Geomechanics:;2020:;Volume ( 020 ):;issue: 011
contenttypeFulltext


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record