Geogrid reinforcement optimal location under different tire contact stress assumptions
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International Journal of Pavement Research and Technology Journal homepage: www.springer.com/42947
Geogrid reinforcement optimal location under different tire contact stress assumptions Abbas F. Jasima*, Mohammed Y. Fattah b, Israa F. Al-Saadic, Alaa S. Abbasa a
Department of Highway and Transportation Engineering, Mustansiriyah University, Baghdad, Iraq. b Building and Construction Engineering Department, University of Technology, Baghdad, Iraq. c Department of Engineering Affairs, University of Baghdad, Baghdad, Iraq Received 19 May 2020; received in revised form 21 August 2020; accepted 28 August 2020
Abstract
Researchers recommended geosynthetics material to enhance the performance of paved and unpaved roads, especially those constr ucted on weak subgrades. There are two types of geosynthetic that most widely used in pavement systems which are geogrids and geotextiles. This study focuses on two primary objectives. First, examining the impact of geogrid (Tensar SS) when reinforcing conventional flexible pavements const ructed on subgrade. The second confirms the most optimal location for integrating a pavement system with geogrid. To quantify the effectiveness of a geogrid in flexible pavements structure, 3D finite element simulation was conducted using thick base pavement structure. In order to identify the best loca tion for the installation of geogrid in pavements, two different geogrid locations were implemented. A constant loading condition was applied while the geogrid locat ions were varied in the proposed pavement structures. This process exposed the effect of geogrid in pavement performance such as th e reduction of longitudinal and transverse shear deformation in unbound layers. This study has identified two different conclusions. First, pavement performance can be improved by implementing a single geogrid layer within the upper third of the layer and second, in order to achieve structural stability, the subgrade-base layer interface may require a geosynthetic stabilization layer. Keywords: Geosynthetic; Geogrid; Finite elements method; Tire contact assumption; Rutting
1. Introduction In recent times, the structural performance of newly constructed, as well as rehabilitated flexible pavement, has been enhanced via geosynthetic reinforcement, especially high-modulus polymeric geogrid. Geogrids are advantageous because they reduce rutting strain and, owing to the tensioned membrane effect produced in the bituminous concrete layer, they can withstand fatigue or horizontal strain [1-4]. In general, the placement of the geogridreinforcement layer is between the subbase and subgrade interface or between the base course and subbase. The broad applicability of this method has sparked ample empirical and analytical research focusing on the measurement and evaluation of enhancements made possible by geogrid base reinforcement of roadways. It was during the 1970s that geogrid reinforcement first began to be employed in roadway applications [5]. From then onwards, the use of this method intensified quickly an
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