Amendment additions and their potential effect on soil geotechnical properties: A perspective review

Liu, Fuming; Yi, Shuping; Zhou, Wan-Huan; Chen, Yong-Zhan; Wong, Ming Hung

doi:10.1080/10643389.2020.1729066

Cited by 4 publications

(1 citation statement)

References 146 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In recent decades, nanotechnology-based remediation has emerged as a promising approach for the lab-scale, in situ and ex situ remediation of combined heavy metal-contaminated sites, offering high performance, lower prices and an environmentally friendly solution [12,13]. Nano-zero-valent iron (nZVI) has garnered significant attention due to its excellent efficacy in the remediation of combined heavy metals contamination and enhancement of the geotechnical engineering characteristics of treated soils [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Shear Responses of Combined Contaminated Soil Treated with Nano Zero-Valent Iron (nZVI) under Controlled Moisture

Wei,

Chen,

Dong

et al. 2023

Sustainability

View full text Add to dashboard Cite

Nano zero-valent iron (nZVI) technologies have gained recognition for the remediation of heavily contaminated sites and reused as backfilling soil. The moisture environment at these sites not only impacts the reactions and reactivity of nZVI but also the dynamic responses of compacted backfilled soils. The research explored the effects of different nZVI dosages (0.2%, 0.5%, 1%, 2%, and 5%) on Lead-Zinc-Nickel ions contaminated soil under a controlled-moisture condition. Cyclic triaxial tests were performed to evaluate the dynamic responses of treated soil samples prepared using a consistent moisture compaction method. Particle size distribution and Atterberg limits tests assessed changes in particle size and plasticity. The study revealed a minor reduction in the particle size, liquid limit, plastic limit, and plasticity index of the contaminated soil. Notably, increasing nZVI dosages in treated soils led to growing Atterberg limits. An increase in the specific sand fraction of treated soils was observed with nZVI, suggesting nanoparticles–soil aggregations favoring existing larger particles. Stepwise loading cyclic triaxial tests indicated an optimal dynamic response of soil treated with 1% nZVI under the controlled-moisture condition, proven by notable enhancements in the maximum shear modulus, maximum shear stress, less shear strain, and higher damping ratio within the small strain range. It should be noted that moisture content in treated soils declined significantly with higher nZVI dosages during preparation, potentially impeding effective aggregation and the formation of a solid soil skeleton. These findings advance the importance of considering the balanced nZVI dosage and moisture content when employing the safety assessment of practical applications in both nano-remediation techniques and soil mechanics.

show abstract