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

By Neal H. Bettigole

This booklet is a entire reference for the evaluate, checking out, choice, and exam of appropriate layout standards and choices for bridge decks, which seem within the AASHTO/LRFD layout requirements. vital demanding situations to civil engineers, equivalent to lifestyles cycle rate research, and constructability, really as relating to retaining site visitors in the course of deck substitute, are mentioned. The authors talk about why using typical bridge deck designs isn't regularly attainable on bridge rehabilitation initiatives. This functional reference will reduction busy engineers in facing the key alterations that would mandate a lot higher realization to deck choice and layout sooner or later. for instance, so much destiny bridge initiatives will contain rehabilitation or replacement\=which makes site visitors upkeep an enormous issue\=and existence cycle expense research is instantly changing into vital within the U.S. This consultant is meant for use through the improvement of any building venture concerning bridges

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Cleanout plug: removable plug for access to a run of pipe, usually in a wye. Runoff, drainage, water: Rain or other water (including contaminating liquids) that collect on the deck surface. Scupper: horizontal opening in the curb or barrier through which water flows. Sewer: underground piping system that connects to a disposal system. Fig. 2. Talking about Drainage (Source: NCHRP Synthesis No. 67, Bridge Drainage Systems, Dec. ) 26 BRIDGE DECKS BRIDGE DECK RATING MATRIX REVIEW CRITERIA IMPORTANCE Weight of deck Degree of composite action Cost of traffic maintenance Ease of construction Ease of future replacement Quality control First cost of deck installed Deck service life Annualized life cycle cost Prknfnrm +« A A C U T H o+rl UOmOrm TO AAon 1 U Stu Ease of inspection Ease/cost of maintenance Resist corrosion/ deterioration resistance Substructure improvement Availability of fabrication TOTALS 10 9 8 7 6 5 4 3 2 1 i 1 1 1 1 1 60 CONCRETE B c A 5(50) 4(36) 2(16) 3(21) 1(6) 4(20) 5(20) 5(15) 4(0) /I/Q\ AIA\ 4(4) 3 5 2 1 1 2 5 5 4 2 3 5 2 5 5 5 BRIDGE DECK RATINGS METAL DECK D E F G H J K L M N 0 P 3 5 2 1 1 4 5 5 5 4 2 3 1 2 5 5 3 5 2 1 5 2 5 5 5 4 2 3 1 4 5 5 3 5 2 1 1 2 5 5 5 4 2 3 5 2 5 5 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 3 5 2 1 1 4 5 5 5 4 2 3 1 2 5 5 3 5 2 1 5 2 5 5 4 4 4*+A 4 4 4 4 5 4 2 3 1 4 5 5 3 5 2 1 1 2 5 5 5 4 2 3 5 2 5 5 4 4 4 4 A A 3(3) 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 2(2) 1(1) 1(1) 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 3(3) (206) HOW TO USE THE BRIDGE DECK RATING MATRIX STEP1 ESTABLISH REVIEW CRITERIA Select and list the criteria that should be reviewed to produce the appropriate deck type.

The decision whether or not to use an overlay, either in new deck construction or on a maintenance or rehabilitation project, will now be most affected by results of a life-cycle cost analysis. In the past, such a decision has been made on a first-cost basis, assuming 10-15 year service lives. Now, it is a matter of overlay cost vs. 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.

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. To prepare a deck for any of the portland cement-based overlays, unsound concrete and all prior patches are removed, then repatched with Portland concrete cement.

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