Role of Aggregate Packing in Segregation Resistance and Flow Behavior of Self -Consolidating Concrete
Shen, Lin
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Permalink
https://hdl.handle.net/2142/83347
Description
Title
Role of Aggregate Packing in Segregation Resistance and Flow Behavior of Self -Consolidating Concrete
Author(s)
Shen, Lin
Issue Date
2007
Doctoral Committee Chair(s)
Leslie Struble
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Language
eng
Abstract
A numerical model based on rheology and mechanics analysis is developed to predict dynamic segregation. The calculated dynamic segregation agrees well with values obtained in the laboratory, using the flow trough, and in the field. It is found that smaller aggregate size, continuous aggregate gradation, lower aggregate density, and higher paste viscosity and yield stress reduce dynamic segregation. Among these factors, aggregate size, gradation, density, and paste rheology have bigger effects than aggregate volume and initial concrete flow velocity. A simple method is introduced to set the maximum flowing distance for SCC mixes based on the flow trough result and mix proportions.
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