Concrete Products

FEB 2019

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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Page 60 of 77 February 2019 • 57 4800 Badger Drive Menomonie, WI 54751 • HEAVY-DUTY CONSTRUCTION DEPENDABLE PERFORMANCE SUPERIOR QUALITY DURABLE FORMS FORM OPTIONS INCLUDE: L&T Panel Box Culvert CaƩle Guard Arched Bridge SepƟc Custom Mesh Bender UƟlity Box Step Median Barrier Noise Wall Mesh Bender Road Barrier Box Culvert +715-235-2166 BUILT FOR A PRECASTER … BY A PRECASTER FAST, SAFE, EFFICIENT PRODUCTION 3500 Gallon SepƟc Tank TECHNICAL TALK 2019 TRB MEETING Then, to facilitate the placement operation, self-consolidating concrete (SCC) mix was used in the remaining six beams. The SCC had high workability and made placement easy. The concrete for beams with either conventional slump or SCC was produced in a stationary mixer at the precast plant, where the samples for tests at the hardened state were likewise prepared. A commercially available air-entraining admixture and high-range water-reducing admixture were included in the mix design. After the release strength and dimensioning, beams were removed from molds and kept at the storage yard of the plant. When concrete reached the minimum 28-day strength of 8,000 psi, the beams were delivered to the jobsite, with each truck and trailer transporting a single member. Two cranes were then used to place each beam. Ozyildirim and Sharp conclude: • Prestressed beams with CFRP with satisfactory strength and very low permeability were fabricated successfully at a local prestressed plant with local crew. • CFRP strands required end preparation for prestressing. • A daily cycle planned for beam production with CFRP was not achieved because of delays attributable to CFRP end preparation, and lack of steam curing that delayed the achievement of the release strength. • Once fabricated, the beams with CFRP were handled, delivered, and erected in the same manner as any other beam. • SCC was much easier to place than concrete with conventional slump. • Bridge deck concrete had satisfactory strength and very low permeability. • Night placement of the deck to minimize cracking was successful. Continued on page 59 Prestressed pile with Corrosion-Free Carbon Fiber Composite rein- forcement being driven at the Nimmo Parkway Bridge site. PHOTO: Virginia DOT

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