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Report No.: CCEER-02-5

Title: Evaluation of Concrete Mixes for Filling the Steel Arches in the Galena Creek Bridge

Authors: A. Banghart, D. Sanders, and M. Saiidi

Date: June 2002

Sponsoring Agency: Nevada Department of Transportation (NDOT)

Performing Organization:
Department of Civil Engineering/258
University of Nevada, Reno
Reno, NV 89557

Abstract:

NDOT's design of the Galena Creek concrete arch bridge requires filling the four structural tubes that are part of the steel frame with a concrete or grout mix. This composite action between the steel and the concrete/grout will increase the strength of the structure by about forty percent. The main objective of this research project was to develop an adequate mix design and the most efficient way to pump it into the structural steel tubes.

To accomplish this objective, two mixes were developed utilizing a survey given to the surrounding states and input from local interviews. The two mixes were then tested for strength, shrinkage, segregation, bleeding and pumpability.

The results of the trial mixes show that both mixes performed adequately in their properties. They both were successfully pumped into the steel tubes and remained uniform throughout the entire length of the steel tubes. Both mixes had minimal bleeding, segregation, and shrinkage.

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