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Engineering properties of used motor oil-contaminated soil treated by sawdust and fiber

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Abstract

One of the methods that is proved adequate and is still under study today is the treatment of hydrocarbon-contaminated materials by using bio-based agents such as sawdust. Despite the numerous studies on the remedial effect of sawdust on the soil, never have the engineering properties of sawdust-treated hydrocarbon-contaminated soils been investigated. Studying such properties is of great importance when it comes to construction over the treated grounds. In this study, the hydro-mechanical properties of a used motor oil (UMO)-contaminated soil treated by five different sawdust contents are evaluated through a complete set of experimental tests, namely standard compaction, direct shear, unconfined compressive strength (UCS), and falling-head conductivity tests. Since the results of the tests showed a degradation in UCS as a result of sawdust treatment, four different percentages of fibers were added to the treated soil and the same tests were conducted again. The results show a positive influence of sawdust on the shear strength, a negative influence on the UCS, and a major reduction in water conductivity. Fiber-reinforced sawdust-treated mixtures display a better shear response, a higher UCS, and an increased conductivity. Scanning electron microscopy (SEM) images also prove the efficacy of sawdust treatment in soil remediation and improvement.

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Abbreviations

UMO:

Used motor oil

UCS:

Unconfined compressive strength (kPa)

SEM:

Scanning electron microscopy

PAHs:

Polycyclic aromatic hydrocarbons

MDD:

Maximum dry density (Mgr/m3)

OMC:

Optimum moisture content (%)

LL:

Liquid limit (%)

PL:

Plastic limit (%)

SBM:

Sand-bentonite mixture

PP:

Polypropylene

ST:

Sawdust-treated

STFR:

Sawdust-treated fiber-reinforced

CSB:

Clean sand bentonite

\({\omega }_{SD}\) :

Hygroscopic water content of the sawdust (%)

\({DR}_{SD}\) :

Dry sawdust ratio (%)

\({W}_{DSD}\) :

Dry weight of sawdust (g)

\({W}_{WSD}\) :

Weight of evaporated water in oven-dried sawdust (g)

\({W}_{SW}\) :

Soil grains weight in the control sample (g)

\({W}_{WSU1}\) :

Weight of the control mixture before oven-drying (g)

\({UMO}_{C}\) :

The investigated UMO content (%)

\({W}_{UW}\) :

Weight of UMO in the control mixture before oven-drying (g)

\({W}_{RUW}\) :

Residual UMO weight in the control mixture after oven-drying (g)

\({W}_{WSU2}\) :

Control mixture sample weight after oven-drying (g)

\({W}_{EUW}\) :

Weight of the evaporated UMO in the control mixture sample after oven-drying (g)

\({RR}_{UMO}\) :

Residual UMO ratio in the soil-UMO mixture (%)

\({ER}_{UMO}\) :

Evaporated UMO ratio in the soil-UMO mixture (%)

\({W}_{S}\) :

Weight of the soil particles in the sample (g)

\({W}_{SUW2}\) :

Weight of the soil-UMO-water mixture after drying (g)

\({W}_{RU}\) :

Weight of the residual UMO in the soil-UMO-water mixture after drying (g)

\({W}_{EU}\) :

Weight of the evaporated UMO in the soil-UMO-water mixture after drying (g)

\({W}_{C}\) :

Water content in the soil-UMO-water mixture (%)

\({W}_{SUW1}\) :

Weight of the soil-UMO-water mixture prior to drying (g

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Correspondence to S. S. Narani.

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Narani, S.S., Bojnourdi, S., Abbaspour, M. et al. Engineering properties of used motor oil-contaminated soil treated by sawdust and fiber. Bull Eng Geol Environ 81, 120 (2022). https://doi.org/10.1007/s10064-022-02617-y

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  • DOI: https://doi.org/10.1007/s10064-022-02617-y

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