Environmental Factors of Mepdg Pavement Design Guide

Environmental Effects on the Resilient Modulus Temperature and wet ar the two most influential factors that can significantly push the pavage and subgrade properties. Because of this, they also have a large lure on its carrying capacity. This paper will only focus on the unbound materials such as the subgrade. This is because the subgrade has the greatest affect on the carrying capacity of pavage. The unbound materials are most affected by moisture unless the temperature drops below 32° F and ice is formed. In this case, the subgrade alive(p) modulus (MR) honour can increase as ofttimes as 120 times higher than its original value. When the subgrade begins to suffer the effect of thawing, it will become saturated which greatly reduces the lively modulus value. Hence, as moisture content increases within unbound materials, the resilient modulus value decreases. For this reason, it is possible to develop a model that analytically predicts changes in modulus do to moistur e change. The design escape is suitable to evaluate the effects of temperature change and moisture in the pavement mental synthesis and subgrade over the design life of a pavement by dint of a modeling tool called the Enhanced merged clime Model (EICM).

The EICM is a one-dimensional coupled soup up and moisture flow program that simulates the characteristics and behavior of pavement and sub-grade materials in conjunction with the environment over years of operations. The stress state, variations in moisture, and freeze/thaw effects are all utilize to evaluate the resilient modulus within the design slip by. For the design guide approach, there are three levels at which MR can be guessd: take aim 1: Only the stress a! esthesia of the unbound layers is accounted for. Level 2: An estimate of MR is used at a mention moisture condition which is determined near best moisture content and maximum dry density. Stress sensitivity is non considered. Level 3: A general estimate of MR is sufficient....If you indigence to get a full essay, order it on our website: OrderEssay.net

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