Title: Assessment of the Pavement Subgrade Using Different In-situ Testing Methods
Abstract: Pavement Subgrade provides the basic support to the structural layers of a pavement system and hence, it is important to perform a reliable assessment of the condition of the subgrade prior to designing and constructing the road. Because, the failures in the subgrade level, during the design life of the pavement, will have the consequence of occurring pavement distresses before the end of expected pavement life. The condition of the subgrade can be assessed in a laboratory environment by collecting samples from the selected site. However, it is a time-consuming process and would be difficult to perform in more frequent intervals on a selected pavement section. Accordingly, in-situ subgrade assessment methods have gained the popularity owing to the expedite results and the ability to conduct at more frequent intervals in less time. This paper reports a comparison of subgrade assessment conducted on a selected experimental road stretch. In that road stretch, test sections were constructed to assess the field performance of geogrid reinforced roads. The bearing capacity of the subgrade (CBR value) was assessed by conducting borehole tests prior construction stage and Dynamic Cone Penetration Test (DCP), Variable Dynamic Cone Penetration Test (PANDA®), Light Weight Deflectometer Test (LWD) and Falling Weight Deflectometer (FWD) test were performed during and at the end of construction. The comparison of the subgrade CBR from different test methods reveals that DCP provides closer assessment to laboratory investigated CBR value while other test methods show an overestimation.
Publication Year: 2021
Publication Date: 2021-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
Access and Citation
Cited By Count: 2
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