A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Damage to concrete due to freeze-thaw (F-T) action is a serious concern for agencies in cold regions of the United States. The most effective method to protect concrete from F-T damage is through the addition of an air entraining agent as an admixture that creates a well distributed, closely spaced, small sized air void system in the concrete. Air content measurement in fresh concrete is a routine quality control and acceptance test procedure that helps to ensure good durability characteristics in the concrete structure. Most agencies, including the Colorado DOT (CDOT), in accordance with industry recommendations, perform the air content measurement at the point of placement in a concrete structure. Between 1993 and 2008, CDOT changed its specifications due to safety considerations of the field personnel. Air content measurements were performed at the point of delivery during this period. While structures built during this period did meet specifications, it is not clear whether the pumping and the placement operations altered the air void distribution. For planning future maintenance activities, CDOT was interested in evaluating the relative condition of bridge decks built under the point of delivery specification and verifying if they indeed possessed good FT durability.
Damage to concrete due to freeze-thaw (F-T) action is a serious concern for agencies in cold regions of the United States. The most effective method to protect concrete from F-T damage is through the addition of an air entraining agent as an admixture that creates a well distributed, closely spaced, small sized air void system in the concrete. Air content measurement in fresh concrete is a routine quality control and acceptance test procedure that helps to ensure good durability characteristics in the concrete structure. Most agencies, including the Colorado DOT (CDOT), in accordance with industry recommendations, perform the air content measurement at the point of placement in a concrete structure. Between 1993 and 2008, CDOT changed its specifications due to safety considerations of the field personnel. Air content measurements were performed at the point of delivery during this period. While structures built during this period did meet specifications, it is not clear whether the pumping and the placement operations altered the air void distribution. For planning future maintenance activities, CDOT was interested in evaluating the relative condition of bridge decks built under the point of delivery specification and verifying if they indeed possessed good FT durability.
Concrete Deck Performance Relative to Air Entrainment
2009
105 pages
Report
No indication
English
Highway Engineering , Construction Equipment, Materials, & Supplies , Bridge decks , Fresh concrete , Air content measurement , Air entraining agent , Admixture , Air void system , Quality control , Acceptance test , Point of placement , Point of delivery , Freeze-thaw (F-T) action , Colorado DOT (CDOT)
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