Engineering and Technology Journal

Dynamic Behavior of Pavement Layers on Sand Subgrade

Mariam M. Hussein; Mohammed Y. Fattah; Miami M. Hilal

Volume 39, Issue 12 , December 2021, , Page 1760-1770

https://doi.org/10.30684/etj.v39i12.1770

Abstract

Reinforcement interlayer reduces the development of cracks in the asphalt overlay by absorbing the stresses induced by heavy traffic or underlying cracking in the early-constructed ... Read More ...

Function and Application of Geogrid in Flexible Pavement under Dynamic Load

Fatin F. Jebur; Mohammed Y. Fattah; Ahmed S. Abduljabbar

Volume 39, Issue 8 , August 2021, , Page 1231-1241

https://doi.org/10.30684/etj.v39i8.1771

Abstract

Nowadays, the increasing demand for road transport makes maintenance and repair of road infrastructures key tasks of road engineering. The current experimental work consists of laboratory ... Read More ...

Evaluation of Reinforced Sub-Base Layer on Expansive Sub-Grade Soil

Mohammed Y. Fattah; Aqeel S. Aladili; Hussam F. Yousif

Volume 34, 9A , September 2016, , Page 1789-1803

https://doi.org/10.30684/etj.34.9A.7

Abstract

Reinforcedpavementlayershavebeengainingpopularityinthefield ofcivil engineeringdue totheir highlyversatileandflexible nature.Withthe adventofgeosynthetics in civil engineering, reinforced ... Read More ... Reinforcedpavementlayershavebeengainingpopularityinthefield ofcivil engineeringdue totheir highlyversatileandflexible nature.Withthe adventofgeosynthetics in civil engineering, reinforced earth technique has taken a new turn in its era. The practice of reinforced earth technique became easy and simple with geosynthetics. The research requirements are providing the materials and manufacturing of the loading machine (loading test apparatus). Materials include soil (bentonite), granularsub base, sand, and geogrid. The testing program consists of preparing of 6 models that represent layers beneath flexible pavement layers (subgrade and sub base layers). The model dimensions are 800*800*800 mm, subgrade layer is 400 mm thick and sub base layer 300 mm thick. The model tests include using geogrid reinforcement at the interface of the subgrade and sub base layer and in the center of sub base layer. It was concluded that a geo-grid reinforced soil is stronger and stiffer and gives more strength than the equivalent soil without geo-grid reinforcement. Geo-grids provide improved aggregate interlock in stabilizing road infrastructure through sub base restraint and base reinforcement applications, Geo-grid reinforcement provided between the sub base course and subgrade soil carries the shear stress induced by vehicular loads and thus it reduces the load transferred to the subgrade and the volume changes induced by swelling of the subgrade soil. The load carrying capacity of the pavement system is significantly increased for geogrid reinforced sub base stretch compared to unreinforced sub base layer on expansive soil subgrade. Comparison of the results of the model without geogrid reinforcement with other models reveals that there is an increase in the bearing capacity of model that includes geogrid reinforcement at the interface of subgrade by about 40%; and 20% for the model that consists of geogrid reinforcement in the center of sub base layer.

Keywords = geogrid reinforcement

Dynamic Behavior of Pavement Layers on Sand Subgrade

Abstract

Function and Application of Geogrid in Flexible Pavement under Dynamic Load

Abstract

Evaluation of Reinforced Sub-Base Layer on Expansive Sub-Grade Soil

Abstract