Study on Strength Characteristics of Solidified Contaminated Soil under Freeze-Thaw Cycle Conditions

Qiang Wang,Jinyang Cui

doi:10.1155/2018/8654368

Qiang Wang, Jinyang Cui

Open Access

https://doi.org/10.1155/2018/8654368

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Abstract

Cement solidification/stabilization is a commonly used method for the remediation of contaminated soils. The stability characteristics of solidified/stabilized contaminated soils under freeze-thaw cycle are very important. A series of tests, which include unconfined compressive strength tests, freeze-thaw cycle tests, and scanning electron microscopy (SEM) tests, are performed to study the variation law of strength characteristics and microstructure. It aims at revealing the microcosmic mechanism of solidified/stabilized Pb2+ contaminated soils with cement under freeze-thaw cycle. The results show that the unconfined compressive strength of the contaminated soils significantly improved with the increase of the cement content. The unconfined compressive strength of stabilized contaminated soils first increases with the increase of times of freeze-thaw cycle, and after reaching the peak, it decreases with the increase of times of freeze-thaw cycle. The results of the scanning electron microscopy tests are consistent with those of the unconfined compressive strength tests. This paper also reveals the microcosmic mechanism of the changes in engineering of the stabilized contaminated soils under freeze-thaw cycle.

Highlights

Cement solidification/stabilization is a commonly used method for the remediation of contaminated soils. e stability characteristics of solidified/stabilized contaminated soils under freeze-thaw cycle are very important
A series of tests, which include unconfined compressive strength tests, freeze-thaw cycle tests, and scanning electron microscopy (SEM) tests, are performed to study the variation law of strength characteristics and microstructure. It aims at revealing the microcosmic mechanism of solidified/stabilized Pb2+ contaminated soils with cement under freeze-thaw cycle. e results show that the unconfined compressive strength of the contaminated soils significantly improved with the increase of the cement content. e unconfined compressive strength of stabilized contaminated soils first increases with the increase of times of freeze-thaw cycle, and after reaching the peak, it decreases with the increase of times of freeze-thaw cycle. e results of the scanning electron microscopy tests are consistent with those of the unconfined compressive strength tests. is paper reveals the microcosmic mechanism of the changes in engineering of the stabilized contaminated soils under freeze-thaw cycle
In all remediation technologies of heavy metal-contaminated soils, the solidification/ stabilization technology has some advantages, for example, short cycle, easy operation, low cost, and wide applicable range. us, it has become one of the widely applied technologies at present [4,5,6,7]. e solidified/stabilized contaminated soils exist in complex natural environment. e engineering properties of solidified/stabilized contaminated soils may change with freeze-thaw cycle effect

Summary

Introduction

Cement solidification/stabilization is a commonly used method for the remediation of contaminated soils. e stability characteristics of solidified/stabilized contaminated soils under freeze-thaw cycle are very important. A series of tests, which include unconfined compressive strength tests, freeze-thaw cycle tests, and scanning electron microscopy (SEM) tests, are performed to study the variation law of strength characteristics and microstructure. It aims at revealing the microcosmic mechanism of solidified/stabilized Pb2+ contaminated soils with cement under freeze-thaw cycle. Is paper reveals the microcosmic mechanism of the changes in engineering of the stabilized contaminated soils under freeze-thaw cycle. In all remediation technologies of heavy metal-contaminated soils, the solidification/ stabilization technology has some advantages, for example, short cycle, easy operation, low cost, and wide applicable range. E engineering properties of solidified/stabilized contaminated soils may change with freeze-thaw cycle effect. E properties of soil mechanics with freeze-thaw cycle effect had been studied by Ning et al [11]and Pang and Shen [12], and the research studies showed that the soil degradation was very obvious after freeze-thaw cycle

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Results

Conclusion