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In-Service Performance of HP Concrete Bridge Decks; Special rept
| 题名： | In-Service Performance of HP Concrete Bridge Decks; Special rept |
| 作者： | Owens, F. T.; Alampalli, S. |
| 关键词： | Bridge decks; High strength concrete; Surveys; New York; Surveys; Cracking(Fracturing); Cracks; Questionnaires; Quality control; Concrete durability |
| 摘要： | Current Department specifications require Class HP (for 'high-performance') concrete for bridge decks in New York State. In April 1996, Class HP replaced Classes E and H concretes as the statewide standard to increase deck durability by reducing cracking and permeability, but subsequently some cracking of HP decks was reported. Initially, no quantitative details were yet available, so that actual HP deck performance could not be evaluated. At the request of the Structures Design and Construction Division, Technical Services Division, Bridge Performance Committee, and Concrete Committee, the Transportation R&D Bureau initiated a survey of the NYSEDOT Regions to record their experience with this mix and quantify the resulting information. By June 1998, more than 80 bridge decks has been built specifying HP concrete. These structures were visually inspected by regional engineers after opening to traffic, indicating that (1) HP decks performed better than Class E and H decks in resisting both longitudinal and transverse cracking, (2) of 84 decks inspected, 49 percent exhibited no cracking at all, but of those that had cracked 88 percent showed equal or less longitudinal cracking and 80 percent equal or less transverse cracking than the previously specified concretes, and (3) average transverse crack density on HP decks was 6.9 cm/sq m, a figure comparable to densities for other decks (not using HP mix) reported in the recent literature. |
| 总页数： | 40p |
| 报告类型： | 科技报告 |
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