Comparative studies of lightweight deflectometer and Benkelman beam deflectometer in low volume roads
| Autor: | Sunny Deol Guzzarlapudi, Rakesh Kumar, Vinod Kumar Adigopula |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
050210 logistics & transportation
Subgrade soils Backcalculated subgrade moduli Composite moduli of subgrade 05 social sciences 0211 other engineering and technologies Transportation Young's modulus 02 engineering and technology Subgrade California bearing ratio Triaxial shear test Low volume road Moduli Low volume symbols.namesake Lightweight deflectometer Deflection (engineering) 0502 economics and business symbols Geotechnical engineering Static moduli of subgrade 021101 geological & geomatics engineering Civil and Structural Engineering Mathematics |
| Zdroj: | Journal of Traffic and Transportation Engineering (English Edition). 3:438-447 |
| ISSN: | 2095-7564 |
| DOI: | 10.1016/j.jtte.2016.09.005 |
| Popis: | A comparative subgrade moduli study is carried out by static and dynamic deflection methods using lightweight deflectometer and conventional Benkelman beam deflectometer on low volume road. Field and laboratory tests are performed at 40 test locations on in-service road of 2 km stretch that contains three common types of cohesive soils (CH, CI, and CL). Pavement static and dynamic responses are estimated to ascertain static, backcalculated, and composite moduli of subgrade. The backcalculated and composite moduli of subgrade is validated at given moisture content using repeated triaxial test. Static moduli values are on lower side as compared with dynamic moduli values whereas the composite, and laboratory moduli of subgrade are approximately consistent with 2% to 7% variation, respectively. Correlation analyses between static and dynamic moduli of different types of subgrade soils depict good correlation of determination (R2) varies between 0.75 and 0.91. Subsequently, validation of static moduli with California bearing ratio (CBR) related subgrade moduli shows moderate correlation of 0.67 to 0.74 whereas dynamic moduli shows good correlation of 0.74 to 0.93 for different types of soils, respectively. Therefore, the comparative analysis shows that lightweight deflectometer provides reliable subgrade moduli values, and it can be used as a quick subgrade strength evaluating tool for low volume roads. |
| Databáze: | OpenAIRE |
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