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On Dynamic Modulus Of Asphalt Concrete For Moisture Damage, Mekdim Weldegiorgis
On Dynamic Modulus Of Asphalt Concrete For Moisture Damage, Mekdim Weldegiorgis
Civil Engineering ETDs
Dynamic modulus (E*) test has gained substantial acceptance in recent years for evaluating Hot Mix Asphalt (HMA) rutting and fatigue cracking performances. Indeed, the recently developed Mechanistic Empirical Pavement Design Guide (MEPDG) uses E* data for stress and strain calculation, and E*-based models for prediction fatigue and rutting performances of a HMA pavement. Unfortunately, neither HMA mix design method nor the MEPDG uses E* value to evaluate moisture damage characteristics of HMA pavements. In fact, moisture damage is a very complex problem, and there exists no models for inclusion in the MEPDG for predicting moisture damage performance of HMA pavements. …
Permeability And Moisture Damage Characteristics Of Asphalt Pavements, Mohiuddin Ahmad
Permeability And Moisture Damage Characteristics Of Asphalt Pavements, Mohiuddin Ahmad
Civil Engineering ETDs
In the past, numerous studies have been conducted on the topics of moisture damage and permeability, but very few studies have correlated permeability with moisture damage in Asphalt Concrete (AC). This study evaluates whether such a relation exists or not. In addition, correlations of permeability with AC mix volumetrics and pores are evaluated. Also, correlation of laboratory permeability with field permeability is examined. In this study, a field survey is conducted to identify a set of eight pavements (bad) that are known to suffer from moisture damage and a set of eight pavements (good) that do not exhibit moisture damage. …
Modeling Moisture-Induced Damage In Asphalt Concrete, Mohammad Hossain
Modeling Moisture-Induced Damage In Asphalt Concrete, Mohammad Hossain
Civil Engineering ETDs
Moisture damage in Asphalt Concrete (AC) is not new but an unsolved problem. For decades laboratory studies have been conducted on both loose and compacted mix to understand the effects of moisture on the AC damage. Adhesive and cohesive damages are the two major types of damages occur inside the AC. Adhesive damage is a separation between aggregate and coated mastic or matrix materials and cohesive damage is the degradation of strength of matrix materials within the AC samples. In this study, Finite Element Method (FEM) modeling technique is used to identify initiation and progression of adhesive and cohesive damage. …