Abstract
Totally contaminated soils is known as problematic soils. Also cohesive soil with low strength is not suitable for geotechnical structures. One of the soil improvement techniques is adding an additive to soil. Given the widespread use of nanoparticles in various fields, using these materials in order to improve geotechnical properties of these soils can be a new approach. In this experimental study, the effect of adding nanoclay and curing period on strength characteristic of kerosene contaminated soil and non contaminated cohesive soil was investigated. Hence unconfined compressive strength test carried out on these two types of soil samples with different proportions of nanoclay and different curing times. The unconfined compressive strength increases significantly by adding low percent of nanoclay. For example the strength of contaminated sample was increased 297% that contained 2% nanoclay and with 28 days curing time.
Highlights
Petroleum products is the most important environmental contaminants
The results of studies on the impact of motor oil on the dense and loose sandy soils indicate a significant reduction in the friction angle of these soil [1] and reduction in Atterberg limits, unconfined compressive strength and a significant increase in coefficient of permeability of clayey soil [2]
The results showed that as percentage of kerosene contamination increases the unconfined compressive strength of soil sample reduces (Fig.2)
Summary
Petroleum products is the most important environmental contaminants. Contamination of soils with oil products is important from environmental aspect and from geotechnical aspect. The results of study on contaminated clayey and sandy soil with crude oil, indicate a decrease in Atterberg limits, maximum dry density, permeability, optimum water content and strength [3]. Effect of nanoclay on kaolinite clay and Lateritic soil, type of soil in the tropics, showed that unconfined compressive strength, plastic and liquid limits increased by adding nanoclay. The investigation on the effect of addition of different nano materials (nanoMgO, nanoclay and nanoCu) on geotechnical properties of Penang soft soil expressed that unconfined compressive strength increased as the increasing of nano materials content up to a certain percentage in the soil and decreased afterwards. Investigates the effect of nanoclay and curing periods on the strength of these soil samples
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