In-Service Performance of High-Performance Concrete Bridge Decks

2000 ◽  
Vol 1696 (1) ◽  
pp. 193-196 ◽  
Author(s):  
Sreenivas Alampalli ◽  
Frank Owens
Keyword(s):  
New York ◽  
High Performance ◽  
Recent Literature ◽  
High Performance Concrete ◽  
Bridge Decks ◽  
New York State ◽  
Crack Density ◽  
Transverse Cracking ◽  
Concrete Bridge Decks ◽  
Better Than

The current statewide standard for New York State bridge decks is Class HP (high-performance) concrete. This mix was introduced in April 1996 to increase deck durability by reducing cracking and permeability. Since its introduction, more than 80 bridge decks have been built with Class HP concrete. To compare the performance of Class HP concrete with that of previously specified concrete, the decks were visually inspected. Results indicated that Class HP decks performed better than previously specified concrete in resisting both longitudinal and transverse cracking. Furthermore, of the 84 decks inspected, 49 percent exhibited no cracking at all, but of those that had cracked, 88 percent exhibited equal or less longitudinal cracking and 80 percent exhibited equal or less transverse cracking than previously specified concrete. A final result showed that average transverse crack density on Class HP decks, excluding uncracked decks, was 6.9 cm/m2. This value is comparable with crack densities for other decks (not using HP mix) that were reported in recent literature.

Developing High-Performance Concrete Mix for New York State Bridge Decks

1996 ◽  
Vol 1532 (1) ◽  
pp. 60-65 ◽  
Author(s):  
Donald A. Streeter
Keyword(s):  
New York ◽  
High Performance ◽  
High Performance Concrete ◽  
Bridge Decks ◽  
New York State ◽  
Concrete Mixture ◽  
Primary Concern ◽  
Increased Strength ◽  
Testing Field ◽  
Class F Fly Ash

The development and implementation of a more durable concrete mixture for bridge decks are described. The work began with review and evaluation of published results of research conducted by others and resulted in a new concrete mixture that has been designated Class HP for high performance. It has better handling and workability characteristics, improved resistance to chloride intrusion, and greater resistance to cracking, and it displays little or no surface scaling. Increased strength was not a primary concern in producing a high-performance concrete for bridge decks, but greater ultimate strength was nevertheless achieved. Class HP concrete is a modification of New York State's standard Class H concrete, incorporating two pozzolan substitutions for cement—20 percent Class F fly ash and 6 percent microsilica. On the basis of satisfactory laboratory testing, field trial, and field production it is being recommended for use statewide. Initial increases in cost are expected to be minimized as concrete producers and contractors become familiar with its mixing and placement. The first-cost increase will be easily offset by more than doubling service life expectancy. Further investigation is progressing to optimize performance of Class HP concrete in bridge decks and for its use in other concrete applications.

Applying Statistical Methods for Further Improvement of High-Performance Concrete for New York State Bridge Decks

1997 ◽  
Vol 1574 (1) ◽  
pp. 71-79 ◽  
Author(s):  
Peter Bajorski ◽  
Donald A. Streeter ◽  
Robert J. Perry
Keyword(s):  
New York ◽  
Fly Ash ◽  
High Performance ◽  
High Performance Concrete ◽  
Bridge Decks ◽  
New York State ◽  
Cementitious Materials ◽  
Concrete Mixture ◽  
Successful Implementation ◽  
York State

A new concrete mixture designated “Class HP” for high-performance has been developed for bridge decks in New York State. A modification of the state’s standard Class H concrete, it has better handling and workability characteristics, reduced permeability, and greater resistance to cracking and displays little or no surface scaling. These improvements have potential to result in twice the previously expected concrete service life. The mixture incorporates substitutions for cement of 20 percent Class F fly ash and 6 percent microsilica. It has now been established as the required concrete mixture for all decks built by the New York State Department of Transportation. Its successful implementation has triggered further research toward an even better mixture. An experiment was designed and performed to investigate the effects on cracking and permeability of microsilica and fly ash content, as well as the effects of total weight of cementitious materials. Experimental designs allowed investigation of a broad range of possible combinations while only a limited number of mixtures were tested. Statistical analysis of experimental data is presented and some concrete mixes are recommended for further study, especially those having 10 to 25 percent fly ash, 11 to 12 percent microsilica, and 327 to 375 kg/m3 (550 to 630 lb/yd3) of cementitious materials, and also those with 20 to 35 percent fly ash, 4 to 6 percent microsilica, and 392 to 428 kg/m3 (660 to 720 lb/yd3) of cementitious materials.

scholarly journals Shrinkage in Ultra-High Performance Concrete Overlays on Concrete Bridge Decks

2019 ◽  
Vol 271 ◽  
pp. 07008
Author(s):  
William Toledo ◽  
Leticia Davila ◽  
Ahmed Al-Basha ◽  
Craig Newtson ◽  
Brad Weldon
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Bridge Decks ◽  
Plastic State ◽  
Early Age ◽  
Concrete Bridge ◽  
Ultra High Performance Concrete ◽  
Concrete Overlays ◽  
Concrete Bridge Decks ◽  
Normal Strength

This paper investigates the shrinkage and thermal effects of an 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 the locally produced UHPC. 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. Thickness of the substrate and amount of reinforcing steel were important factors for shrinkage in the slabs. The thickest slab experienced greater shrinkage than thinner slabs. Comparing this slab to a thinner slab with the same reinforcement indicated that reinforcement ratio is more important than the area of steel.

scholarly journals Low-Cracking, High-Performance Concrete Bridge Decks

2010 ◽  
Vol 2202 (1) ◽  
pp. 61-69 ◽  
Author(s):  
David Darwin ◽  
Joann Browning ◽  
Will Lindquist ◽  
Heather A. K. McLeod ◽  
Jiqiu Yuan ◽  
...  
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Bridge Decks ◽  
Concrete Bridge ◽  
Concrete Bridge Decks
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