Characterization of Interface Bond of Ultra-High-Performance Concrete Bridge Deck Overlays

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.

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Optimization and characterization of high-volume limestone powder in sustainable ultra-high performance concrete

Construction and Building Materials ◽

10.1016/j.conbuildmat.2020.118112 ◽

2020 ◽

Vol 242 ◽

pp. 118112 ◽

Cited By ~ 8

Author(s):

P.P. Li ◽

H.J.H. Brouwers ◽

W. Chen ◽

Qingliang Yu

Keyword(s):

High Performance ◽

High Performance Concrete ◽

High Volume ◽

Limestone Powder ◽

Ultra High Performance Concrete

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Experimental Characterization of Prefabricated Bridge Deck Panels Prepared with Prestressed and Sustainable Ultra-High Performance Concrete

Applied Sciences ◽

10.3390/app10155132 ◽

2020 ◽

Vol 10 (15) ◽

pp. 5132

Author(s):

Muhammad Naveed Zafar ◽

Muhammad Azhar Saleem ◽

Jun Xia ◽

Muhammad Mazhar Saleem

Keyword(s):

High Performance ◽

Bridge Deck ◽

High Performance Concrete ◽

High Strength ◽

Recycled Aggregate Concrete ◽

Recycled Aggregate ◽

Recycled Aggregates ◽

Ultra High Performance Concrete ◽

Aggregate Concrete ◽

Deck Panels

Enhanced quality and reduced on-site construction time are the basic features of prefabricated bridge elements and systems. Prefabricated lightweight bridge decks have already started finding their place in accelerated bridge construction (ABC). Therefore, the development of deck panels using high strength and high performance concrete has become an active area of research. Further optimization in such deck systems is possible using prestressing or replacement of raw materials with sustainable and recyclable materials. This research involves experimental evaluation of six full-depth precast prestressed high strength fiber-reinforced concrete (HSFRC) and six partial-depth sustainable ultra-high performance concrete (sUHPC) composite bridge deck panels. The composite panels comprise UHPC prepared with ground granulated blast furnace slag (GGBS) with the replacement of 30% cement content overlaid by recycled aggregate concrete made with replacement of 30% of coarse aggregates with recycled aggregates. The experimental variables for six HSFRC panels were depth, level of prestressing, and shear reinforcement. The six sUHPC panels were prepared with different shear and flexural reinforcements and sUHPC-normal/recycled aggregate concrete interface. Experimental results exhibit the promise of both systems to serve as an alternative to conventional bridge deck systems.

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