Chemical and physical identification and classification of an artificial soil (circular economy)

Faculty of Engineering, University of Beira Interior, GeoBioTec, Calçada Fonte do Lameiro, 6201-001 Covilhã, Portugal

^* Corresponding author: ljap@ubi.pt

Abstract

The perception and explanation of changes in the mechanical behaviour of contaminated soils are associated with physical classification and chemical composition. Elements are evolutionary in this type of soil and in the context of a contaminated environment. Let’s start by evaluating a group of artificial soils. The matrix is a granitic residual soil with a mixture (M) of hydraulic lime with used lubricating oil. The samples used have proportions of 5, 10, 15 and 20% of M in the residual granitic soil. A soil sample with 5% oil (OS5) was also made, which constitutes the optimal oil content in the soil. Afterwards, the alteration of the physical-chemical identification and the evolutionary classifications of these artificial soils were studied. The structure of the soil is altered, and this is associated with the flocculation of fine particles by the effect of lime and oil and will probably influence the mechanical behaviour of the soils. In chemical terms, it is assumed an increase in the leaching index, a decrease in the chemical mobility index and an increase in losses when it comes to artificial samples. These indices show some potential in the assessment of pollution, but eventually need adjustments, mainly in the scales.