Characterization of Self-Consolidating Concrete for the Design of Precast, Pretensioned Bridge Superstructure Elements

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Title: Characterization of Self-Consolidating Concrete for the Design of Precast, Pretensioned Bridge Superstructure Elements
Author: Kim, Young Hoon
Abstract: Self -consolidating concrete (SCC ) is a new , innovative construction material that can be placed into forms without the need for mechanical vibration . The mixture proportions are critical for producing quality SCC and require an optimized combination of coarse and fine aggregates , cement , water , and chemical and mineral admixtures . The required mixture constituents and proportions may affect the mechanical properties , bond characteristics , and long -term behavior , and SCC may not provide the same inservice performance as conventional concrete (CC ) . Different SCC mixture constituents and proportions were evaluated for mechanical properties , shear characteristics , bond characteristics , creep , and durability . Variables evaluated included mixture type (CC or SCC ) , coarse aggregate type (river gravel or limestone ) , and coarse aggregate volume . To correlate these results with full -scale samples and investigate structural behavior related to strand bond properties , four girder -deck systems , 40 ft (12 m ) long , with CC and SCC pretensioned girders were fabricated and tested . Results from the research indicate that the American Association of State Highway Transportation Officials Load and Resistance Factor Design (AASHTO LRFD ) Specifications can be used to estimate the mechanical properties of SCC for a concrete compressive strength range of 5 to 10 ksi (34 to 70 MPa ) . In addition , the research team developed prediction equations for concrete compressive strength ranges from 5 to 16 ksi (34 to 110 MPa ) . With respect to shear characteristics , a more appropriate expression is proposed to estimate the concrete shear strength for CC and SCC girders with a compressive strength greater than 10 ksi (70 MPa ) . The author found that girder -deck systems with Type A SCC girders exhibit similar flexural performance as deck -systems with CC girders . The AASHTO LRFD (2006 ) equations for computing the cracking moment , nominal moment , transfer length , development length , and prestress losses may be used for SCC girder -deck systems similar to those tested in this study . For environments exhibiting freeze -thaw cycles , a minimum 16 -hour release strength of 7 ksi (48 MPa ) is recommended for SCC mixtures .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2008 -12 -134
Date: 2010-01-14

Citation

Characterization of Self-Consolidating Concrete for the Design of Precast, Pretensioned Bridge Superstructure Elements. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2008 -12 -134 .

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