Modification of a Lateritic Soil with Lime and Cement: An Economical Alternative for Flexible Pavement Layers

Abstract

Lateritic soils are widely spread in the Brazilian territory and they have been used as subgrade of pavement layers. Specifically, the Red-yellow latosols are usually clayey soils and are characterized as low bearing capacity materials for flexible pavement layers. As a conventional solution, soil stabilization with hydrated lime or Portland cement has been used as pavement layers reinforcement. However, the addition of low contents of stabilizers, referring to the soil modification, has not been applied on regular basis in highway designs. The purpose of this paper is to evaluate the use of low contents of lime and cement in the modification of a lateritic soil properties concerning the behavior of mixtures since of the beginning of construction to the resulting final product. At this point, the workability, chemical properties, mechanical behavior and mineralogical composition were evaluated. Mechanistic analyses were performed in order to verify fatigue failures on asphalt layers in roadways structural layers. Experimental results showed that addition of 2% and 3% of lime or cement was enough to change the soil workability and mechanical strength. Additionally, mechanistic analyses supported the soil modification technique as valuable practice with low elastic strains in the asphalt layer when applied in pavement base layers.

Evaluation of the Statistical Significance of Compactive Efforts, Slag and Cement on the Geotechnical Features of Laterite Soil

“…The decreased in OMC as the compactive efforts increased is as a result of reduction of voids present in the soil due to increase in the density of the soil. This is also in agreement with the previous findings by Oluremi et al [48] and Adedokun et al [15]. The OMC for BSL, WAS and AASHTO for samples with 0% cement content decreased from 12.4 -10.9%, 11.8 -10.7 and 10.6 -9.4 for 0 -20% steel slag inclusion respectively, while the corresponding OMC values for samples with 6% cement content decreased from 12 -9.25%, 10.9 -8.8% and 10.6 -8.4% for 0 -20% steel slag.…”

Consolidation Characteristics of Lateritic Soil Treated With Rice Husk Ash

“…This behavior is depicted with a shift in the curve (see Figure 1) to the left as the RHA content increased. Related trend was observed by Portelinha et al, [28] and Osinubi et al, [29]. The progressive reduction in specific gravity (see Figure 2) from 2.6 at 0% RHA to 2.0 at 16% RHA could be due to low density of RHA that was use as an admixture in the soil.…”

Effect of Metakaolin on Strength Properties of Lateritic Soil Intended for Use as Road Construction Material

“…This could be due to the porous nature of metakaolin replacing the fine soil particles. The gradual reduction in liquid limit could also be associated with the agglomeration and flocculation of Clay particles, which is a result of ion exchange at the surface of the particles [3,15,18,42,46]. Plastic limit generally decreased with higher metakaolin contents, from a value of 24.2 to 16.6 % at 30 % metakaolin content.…”