Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Assessment of Ultra-High Performance Concrete Overlays on Concrete Bridge Decks
This paper assesses the potential of a locally produced ultra-high performance concrete (UHPC) mixture proposed for use as an overlay material for concrete bridge decks. In this study, early-age and longer-term shrinkage tests were performed on locally produced UHPC. Slant-shear tests were conducted to evaluate the shear strengths at the bond interface between the UHPC and substrate concrete. Thermal and shrinkage effects in normal strength concrete slabs overlaid with UHPC were also observed. Early-age shrinkage testing showed that approximately 55% of the strain occurred in the plastic state and may not contribute to bond stresses since the elastic modulus of the UHPC should be small at such early ages. Adequate shear strengths were achieved for texture depths ranging from 0.05 to 2.8 mm. Thickness of the substrate and amount of reinforcing steel were important factors for shrinkage in the slabs. The thickest slab experienced greater shrinkage than a thinner slab with the same reinforcement, indicating reinforcement ratio is more important than the area of steel. Continuing work focuses on the development of a failure criterion for the brittle bond between a UHPC overlay and a concrete bridge deck.
Assessment of Ultra-High Performance Concrete Overlays on Concrete Bridge Decks
This paper assesses the potential of a locally produced ultra-high performance concrete (UHPC) mixture proposed for use as an overlay material for concrete bridge decks. In this study, early-age and longer-term shrinkage tests were performed on locally produced UHPC. Slant-shear tests were conducted to evaluate the shear strengths at the bond interface between the UHPC and substrate concrete. Thermal and shrinkage effects in normal strength concrete slabs overlaid with UHPC were also observed. Early-age shrinkage testing showed that approximately 55% of the strain occurred in the plastic state and may not contribute to bond stresses since the elastic modulus of the UHPC should be small at such early ages. Adequate shear strengths were achieved for texture depths ranging from 0.05 to 2.8 mm. Thickness of the substrate and amount of reinforcing steel were important factors for shrinkage in the slabs. The thickest slab experienced greater shrinkage than a thinner slab with the same reinforcement, indicating reinforcement ratio is more important than the area of steel. Continuing work focuses on the development of a failure criterion for the brittle bond between a UHPC overlay and a concrete bridge deck.
Assessment of Ultra-High Performance Concrete Overlays on Concrete Bridge Decks
Toledo, William K. (Autor:in) / Davila, Leticia (Autor:in) / Al-Basha, Ahmed J. (Autor:in) / Newtson, Craig M. (Autor:in) / Weldon, Brad D. (Autor:in)
Tran-SET 2020 ; 2020 ; Albuquerque, New Mexico (Conference Held Virtually)
Tran-SET 2020 ; 278-286
12.01.2021
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Shrinkage in Ultra-High Performance Concrete Overlays on Concrete Bridge Decks
| DOAJ | 2019
Polymer Concrete Overlays for Bridge Decks
| NTIS | 1988
Concrete Cracking in New Bridge Decks and Overlays
| NTIS | 2010
Polymer Concrete Overlays for Bridge Decks, August 1995
| NTIS | 1995