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Effect of CaAl Ratio on StabilizationSolidification of Lead-Contaminated Soil by Ettringite
Joint Authors
Xiang, Lian
Zhu, Huamei
Zhou, Ruoyun
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-8, 8 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-12-30
Country of Publication
Egypt
No. of Pages
8
Main Subjects
Abstract EN
Ettringite is commonly used for the stabilization/solidification for heavy metal-contaminated soils, and its treatment effect will be influenced by Ca/Al mole ratio.
Lead-contaminated soil samples were solidified using ettringite with different Ca/Al mole ratios.
The pH value, unconfined compressive strength of solidified samples, and leaching concentration were investigated to understand the influence of Ca/Al mole ratio on properties of ettringite-solidified contaminated soils.
The microstructural characteristics of solidified contaminated soils were also explored.
The results show that lead leaching concentration decreases dramatically with increasing the content of lime and curing time.
Lead concentration drops from 49.89 mg/L to 0.19 mg/L when Ca/Al mole ratio increases from 4 : 3 to 10 : 3 at 28 days and from 36.57 mg/L to near 0 mg/L at 90 days.
In addition, the unconfined compressive strength of samples drops at first and then increases with the increase of Ca/Al mole ratio.
Besides, the pH values of solidified soil and leachate rise with the increase of content of lime.
The pH values of solidified soil increase from 9.68 to 11.34, and there is little difference between 28 days and 90 days.
However, the pH values of leachate increase from 5.56 to 8.59 at 28 days, and 90-day pH values increase from 5.65 to 9.44.
The results of SEM, XRD, and EDS tests also indicate that Ca/Al mole ratio affects the shape of ettringite, the stabilization/solidification effectiveness of contaminated soil, and the pore of solidified soil.
When Ca/Al mole ratio equals to 8 : 3, ettringite content has a substantial increase, and lead leaching concentration is lower than 5 mg/L.
American Psychological Association (APA)
Xiang, Lian& Zhu, Huamei& Zhou, Ruoyun. 2018. Effect of CaAl Ratio on StabilizationSolidification of Lead-Contaminated Soil by Ettringite. Advances in Civil Engineering،Vol. 2018, no. 2018, pp.1-8.
https://search.emarefa.net/detail/BIM-1115863
Modern Language Association (MLA)
Xiang, Lian…[et al.]. Effect of CaAl Ratio on StabilizationSolidification of Lead-Contaminated Soil by Ettringite. Advances in Civil Engineering No. 2018 (2018), pp.1-8.
https://search.emarefa.net/detail/BIM-1115863
American Medical Association (AMA)
Xiang, Lian& Zhu, Huamei& Zhou, Ruoyun. Effect of CaAl Ratio on StabilizationSolidification of Lead-Contaminated Soil by Ettringite. Advances in Civil Engineering. 2018. Vol. 2018, no. 2018, pp.1-8.
https://search.emarefa.net/detail/BIM-1115863
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1115863