Although the constituents of concrete (aggregate and hydrated cement paste) behave in a linear elastic manner if stress is applied to them and the resulting strain is measured, concrete is not a linear elastic material throughout its entire stress-strain curve.  What is the main reason for the deviation from this behavior? Interfacial transition zone (ITZ) Incomplete hydration of cementitious phases The loading rate applied according to ASTM C 39 presence of C-S-H very close to the aggregate/paste interface

Structural Analysis
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ISBN:9781337630931
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Chapter2: Loads On Structures
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Although the constituents of concrete (aggregate and hydrated cement paste) behave in a linear elastic manner if stress is applied to them and the resulting strain is measured, concrete is not a linear elastic material throughout its entire stress-strain curve.  What is the main reason for the deviation from this behavior?

Interfacial transition zone (ITZ)
Incomplete hydration of cementitious phases
The loading rate applied according to ASTM C 39
presence of C-S-H very close to the aggregate/paste interface
 
 
 
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