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原文传递 Correlation of ASTM D4833 and D6241 Geotextile Puncture Test Methods and Results for Use on WisDOT Projects

题名：	Correlation of ASTM D4833 and D6241 Geotextile Puncture Test Methods and Results for Use on WisDOT Projects
作者：	Elhajjar, R.; Titi, H. H.; Van Dyke, S.; Erfanian, H.
关键词：	Freeze thaw technique##Pin puncture test##Geotextile##Methods analysis##Landfills##Retaining structures##Ultraviolet light sources##Weathering tests##Pavements##
摘要：	Geotextiles are commonly used in pavements, earth retaining structures, and landfills, as well as other geotechnical applications. Various tests are conducted to evaluate and classify geotextiles to determine their suitability for different applications. One of these tests is the puncture strength test. This test evaluates the ability of geotextiles to withstand stresses and loads during construction, which is among the severe conditions that geotextiles can experience. ASTM has recently replaced the standard pin puncture strength test, D4833, with the CBR puncture strength test, D6241. However, many departments of transportation (DOTs) throughout the country and the Federal Highway Administration still refer to D4833. Other state DOTs refer to both D4833 and D6241, or provide a list of alternative test methods to be considered in place of either of these tests. This inconsistency is the result of a missing connection between the old and new ASTMs. The objective of this research is to attempt to correlate the CBR and pin puncture strengths for various categories of geotextiles, regardless of weave type and mass per unit area. Subsequent to this, deterioration of geotextiles due to freeze?thaw conditioning as well as Ultraviolet light exposure was investigated. Puncture resistances of materials with like mass per unit area and base material but with different weave type were also examined. Various types of geotextiles (nonwoven and woven) were subjected to testing in accordance with ASTM D4833 and ASTM D6241 standard procedures. In phase I, ten and fifteen samples of each geotextile type were tested using CBR and pin punctures strength tests, respectively, while a total of ten samples per geotextile type were tested in phase II. All types of geotextiles exhibited puncture strength values, whether pin or CBR, that were consistent within each group with coefficients of variation ranging from 2.8 and 41% for samples tested in phase I and II. It should be noted that distinct load displacement curves were exhibited within each material group. Statistical analyses were conducted to establish a correlation between CBR and pin puncture strength values. Correlations were successfully used to estimate the CBR puncture strength values from the pin test with a reasonable accuracy. In Phase III, an attempt was made to investigate the freeze thaw cycle effects on the geotextile fabric as well as UV light exposure effects. The freeze thaw conditioning showed minor levels of degradation on the puncture test. However, UV and weathering tests showed significant degradation in the puncture strength after exposure. Finally, we include a section in this report with recommended specifications for puncture load values based on the testing performed in this project in the spirit of providing a transition to the new ASTM D6241 puncture test standard.
总页数：	158
报告类型：	科技报告