Evaluating Prediction Models of Creep and Drying Shrinkage of Self-Consolidating Concrete Containing Supplementary Cementitious Materials/Fillers

Micheal Asaad,George Morcous

doi:10.3390/app11167345

Micheal Asaad, George Morcous

Open Access

https://doi.org/10.3390/app11167345

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Journal: Applied sciences	Publication Date: Aug 10, 2021
Citations: 4	License type: CC BY 4.0

Affiliation: University of Nebraska–Lincoln

Abstract

Supplementary cementitious materials (SCMs) and fillers play an important role in enhancing the mechanical properties and durability of concrete. SCMs and fillers are commonly used in self-consolidating concrete (SCC) mixtures to also enhance their rheological properties. However, these additives could have significant effects on the viscoelastic properties of concrete. Existing models for predicting creep and drying shrinkage of concrete do not consider the effect of SCM/filler on the predicted values. This study evaluates existing creep and drying shrinkage models, including AASHTO LRFD, ACI209, CEB-FIP MC90-99, B3, and GL2000, for SCC mixtures with different SCMs/fillers. Forty SCC mixtures were proportioned for different cast-in-place bridge components and tested for drying shrinkage. A set of eight SCC mixtures with the highest paste content was tested for creep. Shrinkage and creep test results indicated that AASHTO LRFD provides better creep prediction than the other models for SCC with different SCMs/fillers. Although all models underestimate drying shrinkage of SCC with different SCMs/fillers, the GL2000, CEB-FIP MC90-99, and ACI 209 models provide better prediction than AASHTO LRFD and B3 models. Additionally, SCC mixtures with limestone powder filler exhibited the highest creep, while those with class C fly ash exhibited the highest drying shrinkage.

Highlights

Forty Self-consolidating concrete (SCC) mixtures were proportioned for different cast-in-place bridge components and tested for drying shrinkage
Shrinkage and creep test results indicated that AASHTO LRFD provides better creep prediction than the other models for SCC with different supplementary cementitious materials (SCMs)/fillers
Self-consolidating concrete (SCC) is highly flowable, non-segregating concrete that can spread into place, fill the formwork, and encapsulate the reinforcement without any mechanical consolidation [1]

Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Self-consolidating concrete (SCC) is highly flowable, non-segregating concrete that can spread into place, fill the formwork, and encapsulate the reinforcement without any mechanical consolidation [1]. To enhance the stability of SCC, supplementary cementitious materials (SCMs)/fillers are used to improve the viscosity and quality of paste in addition to mechanical and durability properties. The binder composition of SCC, in addition to many other factors, affects its viscoelastic properties, primarily shrinkage and creep

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