Influence of Calcium Hydroxide Dissolution on the Transport Properties of Hydrated Cement Systems.
Influence of Calcium Hydroxide Dissolution on the
Transport Properties of Hydrated Cement Systems.
(1936 K)
Marchand, J.; Bentz, D. P.; Samson, E.; Maltais, Y.
Calcium Hydroxide in Concrete: Materials Science of
Concrete. Special Volume. Proceedings. Workshop on
the Role of Calcium Hydroxide in Concrete. American
Ceramic Society. November 1-3, 2000, Anna Maria Island,
FL, 113-129 pp, 2001.
Keywords:
calcium hydroxide; dissolution; leaching; alteration;
transport properties; cements
Abstract:
Calcium hydroxide is one of the main reaction products
resulting from the hydration of Portland cement with
water. It is also one of the more soluble phases found
in hydrated cement systems. The influence of calcium
hydroxide dissolution and its effect on the diffusion
properties of hydration cement pastes were investigated
using the NIST CEMHYD3D cement hydration and
microstructure development model. The results of these
simulations were implemented in another numerical model
called STADIUM. This latter model can be used to predict
the transport of ions in unsaturated porous systems.
Numerical simulations clearly indicate that calcium
hydroxide dissolution contributes to a marked increase
in the porosity of the hydrated cement paste. This
increase in porosity has a detrimental influence on the
material transport properties. The results yielded by
the numerical simulations are in good agreeement with
data of calcium leaching experiments performed in
deionized water.
