versión On-line ISSN 0718-0764
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 clave : Portland cement; porosity; pozzolan addition; hydration; void volume.