Solving Corrosion Problems of Bridge Surfaces Could Save Billions: Report to the CongressGeneral Accounting Office, 1979 - 21 pagini |
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Pagina 3
... Membrane systems with asphalt overlays . tems , four sheet - type and one liquid - type , have been designated as acceptable items for new con- struction . These systems are intended to seal the concrete against chloride intrusion ...
... Membrane systems with asphalt overlays . tems , four sheet - type and one liquid - type , have been designated as acceptable items for new con- struction . These systems are intended to seal the concrete against chloride intrusion ...
Pagina 4
... membrane or overlay systems used for new construction over chloride contaminated decks . Concerning the overall research program , Federal Highway officials , in responding to our report , said that since the late 1960s the program has ...
... membrane or overlay systems used for new construction over chloride contaminated decks . Concerning the overall research program , Federal Highway officials , in responding to our report , said that since the late 1960s the program has ...
Pagina 11
... membranes , concrete overlays , internally sealed concrete , deep polymer impregnation , catho- dic protection , and electrochemical removal of chlorides . The However , very limited performance data is available on the effectiveness of ...
... membranes , concrete overlays , internally sealed concrete , deep polymer impregnation , catho- dic protection , and electrochemical removal of chlorides . The However , very limited performance data is available on the effectiveness of ...
Pagina 12
... membranes / overlays placed over heavily con- taminated concrete have reduced the rate of deterioration . Since the chloride ... membrane / over- lay systems is awaiting development of this tool . The development of these tools is not ...
... membranes / overlays placed over heavily con- taminated concrete have reduced the rate of deterioration . Since the chloride ... membrane / over- lay systems is awaiting development of this tool . The development of these tools is not ...
Pagina 16
... membranes , and up to 35 years for epoxy - coated reinforcing bars , a rather lengthy evaluation is needed to fully assess the effective- ness of the protective systems . The Federal Highway Administration recognizes that long - term ...
... membranes , and up to 35 years for epoxy - coated reinforcing bars , a rather lengthy evaluation is needed to fully assess the effective- ness of the protective systems . The Federal Highway Administration recognizes that long - term ...
Termeni și expresii frecvente
AGENCY COMMENTS Assistant Secretary better identify bridge bridge deck deterioration bridge deck problem bridge deck protective bridge decks needing bridge decks requiring BRIDGE DETERIORATION PROBLEMS bridge repair bridges so deteriorated chloride-contaminated bridge decks collection and evaluation construction CONTAMINATED BRIDGE DECKS contaminated decks cost COST-EFFECTIVE METHOD data retrieval program dated November 14 deck protective systems Department of Transportation District of Columbia eral Eschwege Evaluation Program existing bridge decks Federal Highway Administration Federal Highway Administration's Federal-aid system bridge fiscal year 1979 formal long-term data funds HEAVILY CONTAMINATED BRIDGE Highway Administration officials Highway Administration recognizes Highway officials identify bridge decks interstate bridge decks letter dated November long-term data collection Maryland minor repair versus number of bridges performance data portation potential benefit/cost ratio questionnaire rate of corrosion salt applications save billions Secretary for Administration SECRETARY OF TRANSPORTATION system bridge decks systems on bridge techniques tective systems U.S. General Accounting unprotected bridge decks
Pasaje populare
Pagina 19 - Montana, Nebraska, Nevada, New Jersey, New York, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania (for payment of temporary indebtedness), South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, Washington, and Wyoming.
Pagina i - Administration has found that some unprotected bridge decks require major repair within 5 to 10 years, and often must be replaced after 15 years of service. The major cause of this early deterioration is corrosion of the reinforcing steel bars in the bridge deck, brought about by chloride chemicals which are used to melt snow.
Pagina 3 - ... Various Parameters of Design and Construction." The purpose of this investigation is to provide administrators and designers with factual data on which to base decisions as to the type of protection to provide for bridge decks constructed in corrosive environments. The specific study objective is: to determine the relative time-to-corrosion of reinforcing steel embedded in concrete slabs, fabricated from various mix designs and construction procedures, when the slabs are subjected to periodic...
Pagina 7 - Administration study indicated that, if the 29,000 interstate bridge decks requiring minor repair today were neglected to the extent that they require moderate repair, the current repair cost of about $600 million would increase by an additional $4.4 billion. These estimates are in 1975 dollars.
Pagina ii - PSAD-79-10 later. The potential benefit/cost ratio of repairing and protecting an existing bridge deck needing only minor repair versus completely replacing the deck at a later date is 2.75 to 1.
Pagina i - Tear ShMl. Upon removal, the report cover date should be noted hereon PSAD-79-10 later.
Pagina 1 - Administration found that unprotected bridge decks receiving deicing chemicals require major repair within 5 to 10 years, and often must be replaced after only 15 years of service.
Pagina 8 - State funds is a major reason why bridge decks still in good condition are not being protected by a majority of the 32 States with a serious bridge deterioration problem.
Pagina 1 - Transportation officials requested the Transportation Research Board of the National Academy of Sciences to prepare a state-of-the-art report on the concrete bridge deck deterioration problem.