Evaluation of the influence of compaction energy on the resilient behavior of lateritic soil in the field and laboratory

Abstract

This article presents the study of the resilient behavior of three soil horizons from a deposit of lateritic soil employed in a pavement structure in Rio Grande do Sul, Brazil. The use of lateritic soils in pavement layers is a common practice in Brazil and due to its peculiarities, its behavior must be investigated. The methodology consisted of physical and chemical characterization and resilient modulus determination. Samples from the three horizons, compacted at standard, intermediate and modified energy, were analyzed. In addition, undisturbed samples extracted from the interior and top layer of the embankment were submitted to repeated load triaxial tests for resilient modulus determination. The results indicated that the soil exhibit good behavior for pavement subgrade applications, perhaps as subbase or base course layers. The compound and universal models yielded the best correlation coefficients. Furthermore, the results showed that as the compaction energy increased, the resilient modulus also increased, as long as they are within the optimum water content and compaction degree limit. However, when subjected to immersion in water for four days, the resilient behavior decreased about 73% in relation to unsaturated samples.

Use of Phosphoric Acid and Rice Hulk Ash as Lateritic Soil Stabilizers for Paving Applications

“…It presents a slight podzolization, with the migration of aluminium and organic ma er, with or without the presence of iron, up to the B horizon. The authors [43] performed the physical, chemical, and soil classification, shown in Table 1. They verified the influence of compaction energy on the resilient behavior of the three horizons of the deposit.…”

“…This can directly impact the distribution of the internal forces of a pavement, which is correlated with the parameters of the compaction curve and the physical indices of the soil condition. The authors [43] performed the physical, chemical, and soil classification, shown in Table 1. They verified the influence of compaction energy on the resilient behavior of the three horizons of the deposit.…”

“…To determine the resilient parameters, two consolidated models, presented in Table 3, were used [43,[52][53][54][55][56][57][58], which correlate the applied stresses with experimentally determined constants. Non-linear multiple regressions were performed using the Statistica 10.0 software to verify the model that best represents the behavior of each condition.…”

Extração de Amostras Indeformadas do Subleito da RS 342 e Avaliação do Comportamento Resiliente do Solo Laterítico Argiloso

“…A área em estudo consiste em um aterro composto por solo argiloso laterítico, com fins rodoviários, que compõe um trecho da interseção de acesso ao município, na rodovia RS 342. O solo utilizado para compor o subleito foi extraído de uma jazida caracterizada por Pascoal et al (2021) O aterro possuia 14,20 m de altura e teve a energia Proctor normal empregada para compactação do corpo do aterro, ao passo que a energia intermediária foi utilizada para a camada final de terraplanagem. O ensaio de compactação foi realizado considerando a energia Proctor normal, com intuito de comparar as condições ideais, com a umidade no momento da coleta das amostras indeformadas.…”

“…A principal vantagem de utilizar amostras indeformadas de solo é garantir o conhecimento da deformabilidade na condição que ele se encontra no pavimento. Contudo, o processo de retirada é minucioso e diversos cuidados devem ser tomados na obtenção dessas (PASCOAL et al, 2021).…”