Self-Consolidating Concrete (SCC) for Infrastructure Elements
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2012-07-04
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Edition:Final report.
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Abstract:Because of its unique nature, self-consolidating concrete (SCC) has the potential to significantly reduce costs associated with transportation-related infrastructure, benefiting both MoDOT and the residents of Missouri. SCC is a highly flowable, nonsegregating concrete that can be placed without any mechanical consolidation, and thus has the following advantages over conventional concrete including decreased labor and equipment costs during concrete placement, decreased potential for and costs to repair honeycombing and voids, increased production rates of precast and cast-in-place elements, and improved finish and appearance of cast and free concrete surfaces. However, concerns exist over the structural implications of SCC in cast-in-place and precast elements. Specifically, higher paste contents, higher fines contents, and the use of smaller, rounded aggregates may significantly alter the creep, shrinkage, bond, and shear strength of SCC mixes as compared to traditional concrete mixes with the same compressive strength. These concerns increase for mixtures that use untested aggregate types and various supplementary cementitious materials. The objective of this research was to determine the structural implications of using SCC mixes compared to traditional concrete mixes. This study focused on the hardened properties of SCC mixes containing Missouri aggregates and developed guidelines on its use in infrastructure elements for MoDOT. Consequently, to achieve the benefits and potential savings with SCC, this study undertook seven tasks including the following: Task 1: Literature Review; Task 2: Mix Development; Task 3: Bond and Development of Prestressing Strand and Mild Steel; Task 4: Hardened Properties of SCC Mixes; Task 5: Shear Properties of SCC Mixes; Task 6: Recommendations and Specifications for SCC Implementation; and Task 7: Value to MoDOT and Stakeholders to Implementing SCC. Within these studies, locally available materials were used that were representative of MoDOT produced concrete. The final report consists of a summary report and five technical reports. The findings, conclusions and recommendations of the study can be referenced within these reporting components.
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