Introduction. Increasing international use of HSC in bridges Mainly in response to durability problems; de-icing salts; freeze-thaw conditions Focus of this paper - durability and workability Reduced permeability High workability Good resistance to segregation
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
· “Bridge Views” – http://www.cement.org/bridges/br_newsletter.asp
· “High-Performance Concretes, a State-of-Art Report (1989-1994)”
· “A State-of-the-Art Review of High Performance Concrete Structures Built in Canada: 1990-2000” - http://www.cement.org/bridges/SOA_HPC.pdf
· “Building a New Generation of Bridges: A Strategic Perspective for the Nation” -http://www.cement.org/hp/
· Stolma Bridge, Norway, High Strength Lightweight Concrete
· Completed 1998, balanced cantilever, main span 301m
· Cube strength 69 MPa, density 1900-1950 kg/m3
· Aggregate expanded clay or shale
· W/C ratio down to 0.33
· Durability of LWAC structures in Norway investigated extensively over the last 15 years
· LWAC expected to withstand the design life of more than 100 years with comfortable margins
· 65 MPa to be considered the standard concrete grade for use in precast pre-tensioned bridge girders and post tensioned bridge decks.
· Mix designs to be optimised to ensure maximum benefit from higher strength grades.
· The use of super-workable concrete to be encouraged
· The use of 80-100 MPa concrete to be considered where significant benefit can be shown.
· AS 5100 to be revised to allow strength grades up to 100 MPa as soon as possible.
· Optimisation of standard Super-T bridge girders for higher strength grades to be investigated.