United States Department of Transportation
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Abstract:The fabric area of the project is located on U.S. 18 approximately one mile east of Rudd, Iowa eastward to Station 300+00. The fabric was placed in the month of June, 1979. The asphaltic concrete overlay was all two inches in thickness except for one 2500 foot section of three inches. The fabrics used in the reinforcement areas were Petromat, a nonwoven polypropylene manufactured by Phillips Petroleum Company, and Bidim C-28, a nonwoven polyester manufactured by Monsanto Company. The Cerex (3.0 oz.) and Mirafi 140 as listed on the plans were not used. The Cerex fabric was not available, and the Mirafi 140 was not recommended for this application. A total of 23,955 square yards of fabric reinforcement was placed. The cost of the fabric was $1.10 per square yard in place. Four 2500-foot sections of fabric reinforcement were placed full width of the pavement, separated by comparison control sections. In addition, a 2500-foot test section of 311 ACC was placed. The fabric was lapped one foot in the direction of traffic and one foot longitudinally between lanes of ACC paving. A crack survey was made on the first 1000 feet of each section before the asphalt overlay was placed. Only the lineal footage of all cracks was recorded. A follow-up crack survey was made January 25, 1980, of the first 1000 feet of each section and another was made on November 5, 1980. These follow-up crack surveys show the development of cracks at an early age. More extensive surface patching was done in the area of Station 50+00 to Station 110+00 than on the remainder of the sections. The 1979 annual average daily traffic (AADT) was 3720 vehicles per day (VPD) with 193 trucks. The test areas are over PCC pavement, which has been resurfaced with 3 to 6 inches of ACC and which is 22 feet in width. On May 18, 1983, an examination was made of the test and control sections with the purpose of evaluating the performance of the fabrics as compared with each other and as compared with the control sections. This report contains the results of the evaluation.
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