A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Small-Scale Cyclic Loading Test to Investigate the Rutting Performance of Geogrid-Reinforced Unpaved Pavements
https://orcid.org/http://orcid.org/0000-0003-4202-9728
Conducting and repeating large-scale cyclic load tests are challenging, as these tests are time-consuming, labour-intensive and demanding advanced laboratory facilities. As a screening test method to select the geosynthetic-reinforced pavement configurations for further investigations on a large scale, small-scale cyclic load tests by using laboratory experimental setups with lesser dimensions, therefore, are a preferred starting point for any cyclic loading tests. This paper presents the outcomes of a series of small-scale cyclic loading tests, evaluating the rutting performance of unreinforced and geogrid-reinforced unpaved roads using a circular mould with a 305 mm-diameter and 520 mm height. The test apparatus was capable of conducting a greater number of tests and provided better statistical confidence with relatively minimal effort compared to larger box tests reported in the literature. These cyclic loading tests were conducted on a granular base of varying thicknesses, placing the selected geogrid-reinforcement types (i.e. composite or biaxial) within the granular layer and/or at the base-subgrade interface. Test results show geogrid reinforcement placed at the base–subgrade interface can significantly reduce permanent-vertical deformation when the granular base thickness is relatively thin. Results also show biaxial geogrid in the middle of the granular base performs well in reducing rut depth compared with composite or biaxial geogrid placed at the base–subgrade interface. The potential benefits of geogrid reinforcement diminish with an increase in base thickness because the reinforcement acts as a rigid boundary, and failure would occur above the top layer reinforcement. Better rut resistance in unpaved granular pavements was exhibited first by double reinforcement, then biaxial geogrid at the middle of the granular base, then composite geogrid at the middle of the granular base, followed by composite geogrid at the base–subgrade interface and then biaxial geogrid at the base–subgrade interface. The findings of this experimental study are beneficial for pavement researchers in designing and planning large-scale cyclic loading laboratory or field tests for future research by optimising the number of tests, thus reducing the required amount of materials, cost and effort.
Small-Scale Cyclic Loading Test to Investigate the Rutting Performance of Geogrid-Reinforced Unpaved Pavements
https://orcid.org/http://orcid.org/0000-0003-4202-9728
Conducting and repeating large-scale cyclic load tests are challenging, as these tests are time-consuming, labour-intensive and demanding advanced laboratory facilities. As a screening test method to select the geosynthetic-reinforced pavement configurations for further investigations on a large scale, small-scale cyclic load tests by using laboratory experimental setups with lesser dimensions, therefore, are a preferred starting point for any cyclic loading tests. This paper presents the outcomes of a series of small-scale cyclic loading tests, evaluating the rutting performance of unreinforced and geogrid-reinforced unpaved roads using a circular mould with a 305 mm-diameter and 520 mm height. The test apparatus was capable of conducting a greater number of tests and provided better statistical confidence with relatively minimal effort compared to larger box tests reported in the literature. These cyclic loading tests were conducted on a granular base of varying thicknesses, placing the selected geogrid-reinforcement types (i.e. composite or biaxial) within the granular layer and/or at the base-subgrade interface. Test results show geogrid reinforcement placed at the base–subgrade interface can significantly reduce permanent-vertical deformation when the granular base thickness is relatively thin. Results also show biaxial geogrid in the middle of the granular base performs well in reducing rut depth compared with composite or biaxial geogrid placed at the base–subgrade interface. The potential benefits of geogrid reinforcement diminish with an increase in base thickness because the reinforcement acts as a rigid boundary, and failure would occur above the top layer reinforcement. Better rut resistance in unpaved granular pavements was exhibited first by double reinforcement, then biaxial geogrid at the middle of the granular base, then composite geogrid at the middle of the granular base, followed by composite geogrid at the base–subgrade interface and then biaxial geogrid at the base–subgrade interface. The findings of this experimental study are beneficial for pavement researchers in designing and planning large-scale cyclic loading laboratory or field tests for future research by optimising the number of tests, thus reducing the required amount of materials, cost and effort.
Small-Scale Cyclic Loading Test to Investigate the Rutting Performance of Geogrid-Reinforced Unpaved Pavements
https://orcid.org/http://orcid.org/0000-0003-4202-9728
Conducting and repeating large-scale cyclic load tests are challenging, as these tests are time-consuming, labour-intensive and demanding advanced laboratory facilities. As a screening test method to select the geosynthetic-reinforced pavement configurations for further investigations on a large scale, small-scale cyclic load tests by using laboratory experimental setups with lesser dimensions, therefore, are a preferred starting point for any cyclic loading tests. This paper presents the outcomes of a series of small-scale cyclic loading tests, evaluating the rutting performance of unreinforced and geogrid-reinforced unpaved roads using a circular mould with a 305 mm-diameter and 520 mm height. The test apparatus was capable of conducting a greater number of tests and provided better statistical confidence with relatively minimal effort compared to larger box tests reported in the literature. These cyclic loading tests were conducted on a granular base of varying thicknesses, placing the selected geogrid-reinforcement types (i.e. composite or biaxial) within the granular layer and/or at the base-subgrade interface. Test results show geogrid reinforcement placed at the base–subgrade interface can significantly reduce permanent-vertical deformation when the granular base thickness is relatively thin. Results also show biaxial geogrid in the middle of the granular base performs well in reducing rut depth compared with composite or biaxial geogrid placed at the base–subgrade interface. The potential benefits of geogrid reinforcement diminish with an increase in base thickness because the reinforcement acts as a rigid boundary, and failure would occur above the top layer reinforcement. Better rut resistance in unpaved granular pavements was exhibited first by double reinforcement, then biaxial geogrid at the middle of the granular base, then composite geogrid at the middle of the granular base, followed by composite geogrid at the base–subgrade interface and then biaxial geogrid at the base–subgrade interface. The findings of this experimental study are beneficial for pavement researchers in designing and planning large-scale cyclic loading laboratory or field tests for future research by optimising the number of tests, thus reducing the required amount of materials, cost and effort.
Small-Scale Cyclic Loading Test to Investigate the Rutting Performance of Geogrid-Reinforced Unpaved Pavements
Int. J. Pavement Res. Technol.
Jayalath, Chamara Prasad Gunasekara (author) / Wimalasena, Kasun (author) / Gallage, Chaminda (author)
International Journal of Pavement Research and Technology ; 17 ; 615-635
2024-05-01
21 pages
Article (Journal)
Electronic Resource
English
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