Title: FIELD EVALUATION OF GEOTEXTILES UNDER BASE COURSES (SUPPLEMENT). FINAL REPORT
Abstract: This report describes a structural evaluation of two thin pavements having a woven geotextile separating base and subgrade. Falling Weight Deflectometer and Dynamic Cone Penetration measurements were made. The FWD test was used to generate a load versus deflection plot for each pavement. The penetrometer indicated the layer strengths and effective base thickness. The pavement at the District 1 site consisted of a surface treatment and six inches of flexible base course over a poor clay subgrade. Analysis of the FWD deflection data indicated that the section containing the geotextile was statistically stronger than the control section. The cone penetrometer readings indicated effective base thickness of the experimental section was almost 1.5 inches thicker than the control section. This implies that, even under this very light traffic loading, the geotextile has prevented soil intrusion into the base course. The pavement at the District 21 site consisted of 1.5 inches of Hot Mix, 12 inches of flexible base over a lime stabilized subgrade. No significant differences in performance between the experimental and control sections were found. This study concludes that geotextiles are cost-effective in stabilizing lightly trafficked thin pavements over difficult subgrades. Further studies are required to determine where and when geotextiles can replace traditional soil stabilzation procedures.
Publication Year: 1986
Publication Date: 1986-01-01
Language: en
Type: article
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