A Comparative Study between the Use of High-strength Concrete (HSC) and High-strength Self Consolidating Concrete (HS-SCC) for Accelerated Construction of Pedestrian Bridges

Abstract

Over time, improvements have been made to the design and the materials used in bridge construction which have lowered costs, reduced construction time, and increased service life. One such improvement has been the use of high-strength concrete (HSC) in prestressed bridges. by using HSC, large sustainable bridge structures were built with relatively compact sections. Recently, high-strength selfconsolidating concrete (HS-SCC) has been developed as a viable alternative to HSC. This type of concrete is highly flowable and does not require vibration during fabrication. This concrete is beneficial in situations where there is congested steel or a need for rapid construction. While HS-SCC appears to be a viable alternative to HSC in prestress applications, several performance related issues remain. for example, the behavior of prestress loss, shear, creep, shrinkage, thermal gradients, mechanical property development, time dependent behavior, and serviceability under varying loads between HSC and HS-SCC remain an issue for investigation. This paper explains the instrumentation and material testing plan used to differentiate the mechanical and material properties of HSC and HS-SCC in two prestressed precast pedestrian bridges constructed in Rolla, MO. in addition, both mild steel and glass fiber reinforced polymer (GFRP) reinforcement were used in the deck systems. by using embedded vibrating wire strain gages (VWSG) with built in thermistors, the differences between prestress losses, thermal gradients, and time dependent behavior was analyzed within the bridge girders and deck panels. in addition, a comparative analysis between the mechanical properties was completed using standard ASTM tests for compression, elastic modulus, split cylinder, creep, and shrinkage on both materials. This paper reports the results received from fabrication through erection. Future work will report load tests on both bridges to monitor the differences in serviceability between the two materials.

Department(s)

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Bridge instrumentation; High-strength concrete; High-strength self- consolidating concrete; Prestress loss

International Standard Book Number (ISBN)

978-093704090-4

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Curran Associates, Inc., All rights reserved.

Publication Date

01 Jan 2010

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