For many years, the asphalt industry has been aware of the energy savings and environmental benefits inherent in cold mix or warm mix asphalt technologies. Environmental awareness and the need for improved energy efficiency has increased rapidly over the past few years and extensive measures such as the air pollution reduction targets set by the European Union under the Kyoto Protocol have enco...

15. Supplementary Notes Project performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration. 16. Abstract TxDOT initiated the rigid pavement database project to collect information on the general performance of portland cement concrete (PCC) pavement as well as to collect project-level information on PCC pavement responses and performance. A total...

In support of the initiatives for implementing the new MechanisticEmpirical Pavement Design Guide (MEPDG) in Iowa, a preliminary sensitivity study was undertaken to assess the comparative effect of design input parameters pertaining to material properties, traffic and climate on performance of two existing flexible pavements in Iowa with relatively thick Asphalt Concrete (AC) layers. A total of...

This paper proposes the use of neural network(NN-) based pavement structural analysis tools as surrogates for the flexible pavement response analysis in the new mechanistic empirical pavement design guide (MEPDG) developed for the American State Highway and Transportation Officials (AASHTO). Some of the recent successful applications of NN-based structural analysis models for predicting critica...

The present study explores the structural pavement design techniques related to distresses in terms of rutting, cracking and International Roughness Index (IRI) based on materials properties, roadbed characteristics, climate traffic loads for highway network Saudi Arabia (KSA). was focused selected site conditions at four regions KSA: Central (Riyadh); Eastern (Al-Ahsa); Western (Jeddah) Northe...

Recently developed Mechanistic-Empirical Pavement Design Guide (MEPDG) determines the probable total rutting by summing up the deformations of all layers of the trial pavement. If all distresses outcomes including rutting are within the specification the trial section is designed for construction. Therefore, vertical deformation (or strain) needs to be measured to validate the MEPDG for local c...

One of the most effective ways to increase longevity pavement structures is through integration geosynthetic reinforcement. Geosynthetics are synthetic materials such as geotextiles, geogrids, or geocomposites that added interface between subgrade and base layer a structure. To evaluate effect various parameters on structural benefits reinforcement structure low-volume traffic flexible pavement...

To accurately estimate the dynamic properties of asphalt mixtures to be used in Mechanistic-Empirical Pavement Design Guide (MEPDG), a novel neural computing model using improved beetle antennae search was developed. Asphalt were designed conventionally by eight types aggregate gradations and two binders. The modulus (DM) tests conducted under 3 temperatures loading frequencies construct 144 da...

The present research was designed to determine thermal properties, such as coefficient of thermal expansion (CTE) and thermal conductivity, of portland cement concrete (PCC) used in Iowa pavements. These properties are required as input values by the AASHTO Mechanistic-Empirical Pavement Design Guide (MEPDG). In this research, a literature survey was conducted to determine the major factors tha...