Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evaluation of Silica Fume High Density Thin Bonded Overlays
In September 1999, Bridges 'A' and 'B' of contract TB01-0035-1(110)044 were overlaid with a silica fume concrete surface. The bridges are located on Interstate 35 in Carter County, 1.6 km north of State Highway 53. The deteriorated bridge decks were prepared by coldmilling the surface and removing the delaminated areas with jackhammers. Reinforcement bars were cleaned and exposed areas patched. The mix design was changed several times before a workable mix was developed. Every load was tested at the plant and the job site. Several slump and air content problems were experienced before a consistent mix was finalized. Silica fume concrete was mixed at a batch plant and transported on the job site with ready mix trucks. After each lane was completed, the curing process took another 78 hours. Post construction testing included skid resistance, compressive strength, bond strength, and chloride permeability testing. All these requirements were met. Recommendations were made to establish the slump and use a high range water reducer for construction ease. Other recommendations were, continue to use ready mix trucks, but fill them to a maximum volume of 60 percent. Establish seasonal limitations to minimize changes of extreme temperatures. Finally, temperature parameters should be developed.
Evaluation of Silica Fume High Density Thin Bonded Overlays
In September 1999, Bridges 'A' and 'B' of contract TB01-0035-1(110)044 were overlaid with a silica fume concrete surface. The bridges are located on Interstate 35 in Carter County, 1.6 km north of State Highway 53. The deteriorated bridge decks were prepared by coldmilling the surface and removing the delaminated areas with jackhammers. Reinforcement bars were cleaned and exposed areas patched. The mix design was changed several times before a workable mix was developed. Every load was tested at the plant and the job site. Several slump and air content problems were experienced before a consistent mix was finalized. Silica fume concrete was mixed at a batch plant and transported on the job site with ready mix trucks. After each lane was completed, the curing process took another 78 hours. Post construction testing included skid resistance, compressive strength, bond strength, and chloride permeability testing. All these requirements were met. Recommendations were made to establish the slump and use a high range water reducer for construction ease. Other recommendations were, continue to use ready mix trucks, but fill them to a maximum volume of 60 percent. Establish seasonal limitations to minimize changes of extreme temperatures. Finally, temperature parameters should be developed.
Evaluation of Silica Fume High Density Thin Bonded Overlays
W. B. Brewer (Autor:in) / G. Williams (Autor:in)
2000
90 pages
Report
Keine Angabe
Englisch
Highway Engineering , Construction Equipment, Materials, & Supplies , Transportation & Traffic Planning , Transportation , Bridge decks , Pavement overlays , Concretes , Performance evaluation , Silica fume , Highway construction , Admixtures , Cracking(Fracturing) , Compressive strength , Chlorides , Tests , Permeability , Road materials
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