Abstract
Subgrade soil is the important material as the foundation for supporting the pavement layers and the repeated load of vehicle traffic. To characterize the stiffness and strength behavior of subgrade due to traffic loading in structural pavement design can be determined by resilient modulus and unconfined compressive strength test. In this study, laboratory test of resilient modulus and unconfined compressive strength used to investigate (1) the effect of moisture content of the changes of stiffness and strength characteristics, (2) the correlation between the resilient modulus and elasticity modulus. The soil sample prepared at five type of compacted soils, at the dry side (OMC-20%OMC and OMC-10%OMC), OMC and at the wet side (OMC+10%OMC and OMC+20%OMC) . The result shows the moisture content has a significant effect on cohesive soil, the resilient modulus, modulus elasticity and stress value increase with the increase of moisture content until reaching the optimum moisture content (OMC) and then decrease with the increase of moisture content on the wet side of OMC point. By comparing both resilient modulus and unconfined compressive strength result from ANOVA statistics analysis can be concluded that there is no difference in stiffness between resilient modulus and modulus elasticity methods.
Highlights
Resilient modulus (MR) is a measure of subgrade material stiffness while the modulus of elasticity (E) is a parameter that used to measure material or the resistance of material to elastic deformation when load is applied
The resilient modulus test is conducted in 15 sequences that consist of two phases
The value of resilient modulus, modulus elasticity and the stress, increased with an increasing of moisture content until it reaches the optimum moisture content, the increase of water content will cause a decrease on resilient modulus, modulus elasticity and stress
Summary
Resilient modulus (MR) is a measure of subgrade material stiffness while the modulus of elasticity (E) is a parameter that used to measure material or the resistance of material to elastic deformation when load is applied. Resilient modulus (MR) is stress divided by strain for rapidly applied loads and modulus of elasticity is stress divided by strain for a slowly applied load. Resilient modulus (MR) requires input for determining the stress, strains deflection in pavement design. Modulus of elasticity can be deformed for any solid material and representation of the stress strain ratio. The ability of materials to return to its original shape after release the stress applied is called stiffness. Stiffness is the degree to which an object resists its deformation in applied load
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