Abstract
In this research, large direct shear tests were conducted to evaluate the interface shear strength between reclaimed asphalt pavement (RAP) and kenaf geogrid (RAP–geogrid) and to also assess their viability as an environmentally friendly base course material. The influence of factors such as the gradation of RAP particles and aperture sizes of geogrid (D) on interface shear strength of the RAP–geogrid interface was evaluated under different normal stresses. A critical analysis was conducted on the present and previous test data on geogrids reinforced recycled materials. The D/FD, in which FD is the recycled materials’ particle content finer than the aperture of geogrid, was proposed as a prime parameter governing the interface shear strength. A generalized equation was proposed for predicting the interface shear strength of the form: α = a(D/FD) + b, where α is the interface shear strength coefficient, which is the ratio of the interface shear strength to the shear strength of recycled material, and a and b are constants. The constant values of a and b were found to be dependent upon types of recycled material, irrespective of types of geogrids. A stepwise procedure to determine variable a, which is required for analysis and design of geogrids reinforced recycled materials in roads with various gradations was also suggested.
Highlights
Roadways and highways are commonly categorized based on the traffic volumes and service life into two main categories—namely, permanent roads and temporary roads.Permanent roads are subjected to heavy traffic volumes of more than a million traffic loads during their service life
The shear stresses and dilatation characteristics of unreinforced reclaimed asphalt pavement (RAP) obtained from Figure 3. (a) large direct shear test (LDST) apparatus and (b) a photo of the tested kenaf geogrid
The results indicated that the RAP samples with gradation within the boundary specified by Department of Highways (DOH) can be used as base/subbase materials
Summary
Roadways and highways are commonly categorized based on the traffic volumes and service life into two main categories—namely, permanent roads and temporary roads. Permanent roads are subjected to heavy traffic volumes of more than a million traffic loads during their service life. On the other hand, are subject to lower traffic volumes of less than 10,000 load applications during their service life. Temporary roads include access roads, haul, detours, and construction platforms, which are used to construct permanent roads on weak soil layers [1]. Due to the scarcity of high-quality natural materials, marginal soils have been used for road construction with some form of mechanical or chemical treatment.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
