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原文传递 HIGH-PERFORMANCE CONCRETE IN A BRIDGE IN RICHLANDS, VIRGINIA

题名：	HIGH-PERFORMANCE CONCRETE IN A BRIDGE IN RICHLANDS, VIRGINIA
作者：	Celik Ozyildirim and Josd P. Gomez
关键词：	high performance concrete, prestressed concrete girders, bridges
摘要：	The Virginia Department of Transportation built a high-performance concrete (HPC) bridge with high-strength and low permeability concrete in Richlands. The beams had a minimum compressive strength of 69 MPa (10.000 psi) at 28 days and large. 15 mm (0.6 in) in diameter, strands at a 51-mm (2-in) spacing. The deck concrete was designed to have a minimum compressive strength of 41 MPa (6,000 psi) and low permeability. This report describes the development of the HPC mixes, material and structural testing, construction, and condition assessment of the bridge after two winters. Structural testing was conducted on two full-scale 9.5-m (31-ft) AASHTO Type II beams with the large-diameter strands and with composite slabs. Pullout tests were conducted on the same strands as used in the beams. Tests were also conducted to determine if there were any residual phosphates on the strands as these have been suspected to adversely affect the bond between the strand and the hardened concrete The test program, field application, and in-service performance of the bridge indicated that HPC concrete with high strength and low permeability can be produced using locally available material. The use of the large-diameter strands at a 51-mm (2-in) spacing was also successful.
报告类型：	科技报告