Resumen

FERNANDEZ, J.L.; GONZALEZ, E.L.; BROWN, S.A.  y  BATIC, O.R.. Evolution of Porosity in Portland Cement Pastes by addition of Natural Pozzolan. Inf. tecnol. [online]. 2004, vol.15, n.5, pp. 37-40. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642004000500006.

A determination was made of the evolution of porosity in Portland cement pastes for general usage (CPN IRAM 50000) by incorporating different proportions of natural pozzolan from the region, and as a function of curing time. The API-RP-40 norm based on Boyle´s law was used to measure the porosity, determining the paste effective void volume. This is done by calculating the difference between the total gas space at a pressure P₁ of 6,9 .10⁵ Pa and the calibrated volume of the cell at atmospheric pressure P₀. Then the paste volume was obtained by porosimeter calibration curves. In conclusion, this study demonstrates that the porosity of pastes decreases as a function of the amount of cement replaced and time of cure

Palabras llave : Portland cement; porosity; pozzolan addition; hydration; void volume.