Analysis of the Relation between Accelerated Carbonation, Porosity, Compressive Strength and Capillary Absorption in Concrete, in the Search of a New Control Method by Durability

Ana María Carvajal, Pablo Maturana, C Pino, J Poblete

Abstract


Carbonation of concrete is the second
reason of corrosion on reinforced concrete
structures. This has led to study the
methods that might be useful for defining,
from the phase of project, the conditions
that a certain concrete must have, besides
resisting mechanically, to be resistant to
external attacks like it is the effect of the
CO2 of industrial environments.
With the purpose of establishing a simple
method of testing that complements
the compressive strength, and that
allows to predict the useful life of the
concrete in terms of its carbonation,
possible relations were studied between
four parameters: depth of carbonation,
capillary absorption, porosity and
compressive strength.
Samples were made by concretes with w/c
0.45 – 0.53 – 0.59. The three concretes

were prepared under the same procedures
and with the same cement, sand, gravel
and additives.
The samples were tested to compressive
strength, capillary absorption and
porosity, at different times of accelerated
carbonation in a chamber designed for
such purpose.
The results showed a direct relation
between coef f i c ient of capi l lar y
absorption and depth of accelerated
carbonation on a concrete. The tests of
porosity did not show any correlation
with the depths of carbonation and with
the coefficient of absorption either.
Finally it was found that the coefficient
of absorption can be used as tool for the
development of a new method of quality
control for concrete durability.

Key words: Accelerated carbonation, capillary absorption, concrete durability,
porosity.


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