Effect of Carbonation on the Hydro-mechanical Properties of Portland Cements

This work evaluates experimentally effects of carbonation on the hydro-mechanical properties of Portland cement. Samples were carbonated at 90°C and 28 MPa under wet supercritical CO2. Two types of carbonation features were achieved, either the samples were homogeneously carbonated or they displayed sharp carbonation fronts. Using a tri-axial apparatus, static elastic moduli and mechanical strength were measured at in-situ pressure conditions (28 MPa) and showed a degradation of the mechanical properties of the samples where a carbonation front prevailed. Water and gas permeabilities were measured and showed that samples with a carbonation front exhibit a stress sensitive permeability. P and S elastic wave velocities were measured to evaluate dynamic (ultrasonic range, 1 MHz) elastic moduli. The use of an effective medium theory approach enabled characterization of the density and distribution of cracks within the samples. This approach shows that samples developing a carbonation front were damaged.

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  • English

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  • Accession Number: 01146869
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 23 2009 10:06AM