Self-consolidating concrete (SCC) may be used in structural members such as precast noise wall panels, barriers, three-sided structures, etc. as described in Standard Specification Section 6-02.3(27), and may be used in prestressed concrete girders in accordance with Sections 6-02.3(25)B and 9-19.1.
WSDOT has previously imposed limitation on the use of SCC for prestressed girders due to the concerns on mechanical and visco-elastic properties including lower modulus of elasticity, higher creep coefficient, higher shrinkage strain, longer bond transfer and development lengths of strands, flexural and shear strengths, etc. Recent bridge projects in Washington and other states, SCC production in PCI plants, and NCHRP research projects have demonstrated that SCC could successfully be used in precast concrete members. As a result WSDOT is lifting the limitation on the use of SCC for precast concrete bridge applications.
The Standard Specification Sections mentioned above will be revised to acknowledge the use of SCC for all precast concrete bridge applications.
The BDM revision should read as follows: