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 The use of high strength lightweight concrete reduced shipping weights. High Strength Lightweight Concrete for Use in Precast, Prestressed Concrete Bridge Girders in Georgia Paul Liles, Georgia Department of Transportation and R. Brett Holland, Georgia Institute of Technology
The use of high strength, high performance lightweight concrete can result in longer span lengths and lighter weight girders. After extensive research, the Georgia Department of Transportation designed and constructed a bridge with two spans having high strength lightweight concrete in the girders.
Full Article> High Strength Lightweight Concrete Properties of the I-85 Ramp over State Route 34 R. Brett Holland and Lawrence F. Kahn, Georgia Institute of Technology
In conjunction with the construction of the I-85 Ramp over Georgia State Route 34, high strength lightweight concrete beams were instrumented to measure transfer length and prestress losses. In addition, tests were made to determine compressive strength, modulus of elasticity, and creep of the concrete used in the beams. Measured and predicted values were compared. Full Article> Measurement of Air Content in Concrete Michelle L. Wilson, Portland Cement Association
Five techniques for the measurement of the air content of fresh concrete and one technique for hardened concrete are described. Potential sources of errors are identified.
Full Article>
HPC Bridge Views, Issue 61, May/June 2010
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