Abstract
In this research, the effects of speed and weight on needlepunched nonwoven geotextiles subjected to CBR and Puncture tests were investigated. Polyester nonwoven fabrics with different weights (460, 715, 970 and 1070 g/m2) were prepared. The CBR test (ASTM D 6241) was conducted with five speeds, 25, 50, 75, 100 and 125 mm/min on geotextile layers, while the Puncture test (ASTM D 4833) was carried out at a standard speed of 300 mm/min on the same fabrics. Based on the load-elongation curves of these two tests, different puncture parameters, including puncture resistance (puncture force at failure), elongation at maximum force and puncture energy, were measured and statistically analyzed using ANOVA and multiple-range test methods.
The results of the CBR tests indicate that the fabric weight significantly influenced the puncture resistance as well as the puncture energy and elongation while speed only affected the fabric puncture resistance and puncture energy.
On the other hand, in the Puncture test, the fabric weight influenced all measured parameters.