详情

原文传递 Bridge Deck Service Life Prediction and Costs.

题名：	Bridge Deck Service Life Prediction and Costs.
作者：	G. Williamson; R. E. Weyers; M. C. Brown; M. M. Sprinkel;
关键词：	service life,bridge decks,concrete bridge decks,chloride corrosion model/life cycle costs, bridges (structures), predictions, costs, computer software, virginia, construction specifications, bridge surfaces/life cycle costs, bridges (structures), predictions, costs, computer software, virginia, construction specifications, bridge surfaces
摘要：	The service life of Virginias concrete bridge decks is generally controlled by chloride-induced corrosion of the reinforcing steel as a result of the application of winter maintenance deicing salts. A chloride corrosion model accounting for the variable input parameters using Monte Carlo resampling was developed. The model was validated using condition surveys from 10 Virginia bridge decks built with bare steel. The influence of changes in the construction specifications of w/c = 0.47 and 0.45 and w/cm = 0.45 and a cover depth increase from 2 to 2.75 inches was determined. Decks built under the specification of w/cm = 0.45 (using slag or fly ash) and a 2.75 inch cover depth have a maintenance free service life of greater than 100 years, regardless of the type of reinforcing steel. Galvanized, MMFX-2, and stainless steel, in order of increasing reliability of a service life of greater than 100 years, will provide a redundant corrosion protection system. Life cycle cost analyses were conducted for polymer concrete and portland cement based overlays as maintenance activities. The most economical alternative is dependent on individual structure conditions. The study developed a model and computer software that can be used to determine the time to first repair and rehabilitation of individual bridge decks taking into account the time for corrosion initiation, time from initiation to cracking, and time for corrosion damage to propagate to a state requiring repair. / Supplementary Notes: Prepared in cooperation with Virginia Polytechnic Inst. and State Univ., Blacksburg. Sponsored by Virginia Dept. of Transportation, Richmond. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5301 Shawnee Road, Alexandria, VA, 22312, USA. / NTIS Prices: PC A06 / Corporate Author Code: 089346000 / Classifivation: Unclassified report
报告类型：	科技报告