The influence of post-compaction moisture content variation on the mechanical behavior of soils from São Paulo state pavements / A influência da variação da umidade pós-compactação no comportamento mecânico de solos de rodovias do interior paulista

AUTOR(ES)

Marcelo de Castro Takeda

DATA DE PUBLICAÇÃO

2006

RESUMO

On road construction, the field compaction conditions are usually close to those determined from Proctor tests. Environmental variations may lead to changes in the pavement moisture and also changing its resilient properties. The main objective of this research is to study the influence of post-compaction moisture content variation on the resilient modulus of soils from São Paulo state pavements, using laboratory tests. To accomplish this objective, seventy three soils samples were collected and characterized. Among them, thirty samples were selected, after four different tests were carried out to determine the soils genesis, to study the post-compaction moisture content variation. Half of these selected soils are lateritic ones, and the other half are non-lateritic soils. The specimens were compacted at optimum moisture content and submitted to drying and moistening processes prior cyclic triaxial test to be carried out. The results allowed the resilient modulus modeling as a function at the stress state and the performance evaluation of five different models. The genesis and grain size distribution influence on the resilient modulus values were studied. The effects of moisture content variations on lateritic and non-lateritic soils were investigated. An expression to estimate the resilient modulus variations with the moisture variations was determined, independently of the stress state. The existence of relations of the compound model regression parameters with the results of unconfined compressive strength and soil properties were studied. The possibility of using the initial tangent modulus variations with the moisture variations to estimate the effects on the resilient modulus were also investigated.

ASSUNTO(S)

sucção cyclic triaxial tests subleito moisture content teor de umidade suction subgrade compressive strength test resiliência resilient modulus pavement compressão simples ensaio triaxial cíclico pavimentação módulo de resiliência

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