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02794aam a2200397Ia 4500 001 039F6D1081F911E58D57CB8FDAD10320 003 SILO 005 20151103010200 008 971013s1996 iaua t s000 0 eng d 035 $a (OCoLC)37844615 040 $a NUI $b eng $c NUI $d OCLCQ $d OCLCO $d OCLCA $d UIG $d NUI $d SILO 043 $a n-us-ia 086 $a 17-T772PD 2:U47/2 1996 $2 iadocs 088 $a Iowa DOT Project HR-559 100 1 $a Grove, James D. 245 10 $a Iowa ultra thin whitetopping research at two years of age / $c by James D. Grove, James Cable, Melinda Heyer. 260 $a Ames, Iowa : $b Office of Materials, Project Development Division, Iowa Dept. of Transportation, $c 1996. 300 $a 32 pages : $b illustrations ; $c 28 cm 500 $a Depository. $5 IaU 500 $a "November 1996." 500 $a "In cooperation with the Federal Highway Administration as work order #DTFH71-94-TBO-IA-37"--Cover. 513 $a Interim report. $b 8-94 to 8-96. 520 3 $a An 11.6 km research project was constructed in 1994 on a portion of Iowa Highway 21 in Iowa County, from U.S. 6 to Iowa Highway 212. This research is intended to evaluate the effect of four primary variables on long term performances of the PCC concrete overlay, commonly called whitetopping. The variables are thickness (50 mm, 100 mm, 150 mm, and 200 mm), joint spacing (0.6 m squares, 1.2 m squares, 1.8 m squares, and 4.6 m spacing), fiber use (concrete with and without polypropolene fibers) and surface preparation (patch only, scarifying the surface, and cold-in-place recycling). After two years, only two sections exhibit a small amount of debonding and distress cracking. Both sections are 50 mm thick. Within each of these two sections, only 2% of the area is affected. Two other 50 mm thick sections have a small number of cracks but no debonding has been found. No adverse effects of these cracks are evident. Three asphalt overlay sections were also constructed. In each asphalt section, transverse cracks have recently been found. At two years of age, the research sections are performing very well. An insignificant number of cracks and no distressed areas have been found in any research sections thicker than 50 mm. 650 0 $a Pavements $z Iowa $x Overlays. 650 07 $a Debonding $2 trt 650 07 $a Fiber reinforced concrete $2 trt 650 07 $a Overlays (Pavements) $2 trt 650 07 $a Whitetopping $2 trt 650 07 $a Ultra thin whitetopping $2 trt 700 1 $a Cable, James K., $d 1941- 700 1 $a Heyer, Melinda. 710 1 $a Iowa. $b Office of Materials. $b Office of Materials. 710 1 $a United States. $b Federal Highway Administration. 941 $a 1 952 $l OVUX522 $d 20180105052753.0 956 $a http://locator.silo.lib.ia.us/search.cgi?index_0=id&term_0=039F6D1081F911E58D57CB8FDAD10320Initiate Another SILO Locator Search