Effect of Moisture Content on Subgrade Soils Resilient Modulus for Predicting Pavement Rutting

The subgrade soil stiffness, which depends on the in-situ moisture content and index characteristics, is a key factor in pavement rutting. Due to variations compaction process used during construction seasonal changes, may deviate from desired condition. resilient modulus (MR), an important parameter of Mechanistic-Empirical (M-E) design process, specify stiffness. Repeated load triaxial tests, can be challenging time-consuming execute, are often determine MR. As result, correlations between MR more accessible stiffness metrics qualities frequently used. California bearing ratio (CBR) repeated tests were carried out this investigation. Soil specimens fabricated at levels that both above below optimum (wopt). results two correlated, statistical models created correlate parameters generalized constitutive model with characteristics index. Additionally, utilizing found for soils compacted wopt ±2%wopt, rutting was analyzed three base layer types. demonstrated laboratory-measured (MR(Lab)) decreases as increases. Specimens −2%wopt showed higher MR(Lab) than wopt. +2%wopt lower Results also indicated predicted compared field measured (MR(Lab)). If stabilized aggregate foundation employed instead untreated granular base, condition significant impact