Effect of Hydrated Cement Paste

The elastic modulus of cement paste is determined by its porosity. The water to cement ratio (w/c), air content, admixture dosage and degree of cement hydration control the porosity of cement paste.

The modulus of elasticity of concrete can be represented based on the following simple equation:

Ec = Eag + Ep(1 – g)


Ec – Modulus of elasticity of concrete

Ea – Modulus of elasticity of aggregate

Ep – Modulus of elasticity of cement paste

g – Volume fraction of the aggregate

1 – g – Volume fraction of the cement paste

Ep is low due to the poor density of the transition zone.


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