Self consolidating concrete for precast prestressed concrete bridge elements


30-Jan-2018 10:17

With respect to shear characteristics, a more appropriate expression is proposed to estimate the concrete shear strength for CC and SCC girders with a compressive strength greater than 10 ksi (70 MPa).The author found that girder-deck systems with Type A SCC girders exhibit similar flexural performance as deck-systems with CC girders.The AASHTO LRFD (2006) equations for computing the cracking moment, nominal moment, transfer length, development length, and prestress losses may be used for SCC girder-deck systems similar to those tested in this study.For environments exhibiting freeze-thaw cycles, a minimum 16-hour release strength of 7 ksi (48 MPa) is recommended for SCC mixtures.

To correlate these results with full-scale samples and investigate structural behavior related to strand bond properties, four girder-deck systems, 40 ft (12 m) long, with CC and SCC pretensioned girders were fabricated and tested.Thereby minimized also are noise levels in concrete plants and at construction sites, plus aggregate segregation, honeycombing, and voids in the mix.Overall concrete quality is improved with the eradication of such vibration-related problems as under vibration, over vibration, and damage to the air void structure.18-12) is underway to develop SCC mixes, structural design parameters, and construction specifications for precast/prestressed concrete elements.

Whatever conventional concrete can do, SCC can do better, faster, and cheaper, especially for concrete elements with special textures, complex shapes, and congested reinforcements, contends Myint Lwin, Director of the Federal Highway Administration's (FHWA) Office of Bridge Technology.

We are using it now on all products on every project for Nebraska, says Concrete Industries' Mark Lafferty.



Khayat, K. H. and Mitchell, D. "Self‐Consolidating Concrete for Precast, Prestressed Concrete Bridge Elements," Transportation Research Board, NCHRP Report.… continue reading »


Read more

Get this from a library! Self-Consolidating Concrete for Precast, Prestressed Concrete Bridge Elements. Denis Mitchell;… continue reading »


Read more

Self-Consolidating Concrete. the precast, prestressed girders’ response of the different spans was. Bridge Elements and Numbering.… continue reading »


Read more

Dots Adopt Scc Specs. in Japan, self-consolidating concrete. for SCC use in precast, prestressed concrete bridge elements and recommend relevant.… continue reading »


Read more

Self-consolidating c. Self-consolidating concrete for precast, prestressed concrete bridge elements. for the use of self-consolidating concrete SCC in.… continue reading »


Read more