Bridge decks : design, construction, rehabilitation, - download pdf or read online

By Neal H. Bettigole

ISBN-10: 078440223X

ISBN-13: 9780784402238

This e-book is a entire reference for the assessment, checking out, choice, and exam of correct layout standards and choices for bridge decks, which look within the AASHTO/LRFD layout requisites. vital demanding situations to civil engineers, comparable to existence cycle price research, and constructability, relatively as regarding protecting site visitors in the course of deck alternative, are mentioned. The authors speak about why using average bridge deck designs isn't really consistently attainable on bridge rehabilitation tasks. This functional reference will relief busy engineers in facing the foremost adjustments that would mandate a lot higher consciousness to deck choice and layout sooner or later. for instance, such a lot destiny bridge tasks will contain rehabilitation or replacement\=which makes site visitors upkeep a big issue\=and existence cycle price research is instantly changing into vital within the U.S. This consultant is meant for use during the improvement of any building undertaking concerning bridges

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Replacement over the life of the bridge. PROTECTING THE REBAR Although reinforced concrete is the "ideal" composite construction material, it is still not perfect. The concrete, high in compressive strength but weak in tension, is balanced by steel's high tensile strength. Steel has one drawback: it wants to return to the earth in the form of iron oxide. Encasing the steel in the highly alkali concrete generally protects it from corrosion unless—and until—moisture and oxygen reach it. Chloride ions in solution are the principal culprits.

Sounding can also be done with a hammer. Some researchers have developed high-tech sonic devices for locating delaminations and other flaws, but these have not been put into general use. The more conventional chain drag and hammer methods are far less expensive and do not require experienced technicians and operators. Another nondestructive method for decks that have not been overlaid with asphalt or any other surfacing material is thermographic mapping. This is done with special equipment housed in mobile units that operate over large areas at fairly high speeds.

DECK OVERLAYS Deck overlays are generally used for repair of a deteriorated riding surface. They may be latex-modified concrete, low-slump dense concrete, 36 BRIDGE DECKS and hot-mix asphaltic concrete with a preformed membrane. Their main limitations are that they will increase the dead load, and this must be evaluated before specifying any one of them. They, like the coatings, should not be applied over chloride-contaminated concrete nor where alkali aggregate reactions (silica or carbonate) are present.

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Bridge decks : design, construction, rehabilitation, replacement by Neal H. Bettigole

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