Elastic properties of concrete

CE 60Instructor: Paulo Monteiro

Elastic Modulus of Concrete

• Introduction

• Testing

• Materials

• Poisson’s ratio


Introduction


Testing

Types of Elastic Modulus

ASTM Testing


Materials

• Water-to-cement ratio

• Aggregate Type

• Aggregate Content


Poisson’s ratio


Design Code

• ACI-318• E = 33 w1.5 f 0.5


Creep of Concrete


Introduction


Reason


Importance


Effect of Mix Proportions

• Water-to-cement ratio• Aggregate Type• Aggregate Content• Time and Humidity• Geometry• Temperature• Magnitude of the applied stress


Effect of volume of aggregate


Effect of thickness


Effect of humidity


Effect of Geometry

1

1.5

2

2.5

0 100 200 300 400 500

50 % RH

70 % RH

90 % RH

Cre

ep C

oeffi

cien

t,

R

H

Theoretical Thickness (mm)


Concrete Creep


Concrete Relaxation


Summary


Summary


Summary

Engineering

Elastic properties of concrete