Regresar

Comparative permeability analysis of straight concrete and concrete with addition of microsilica and metakaolin

Abstract:

In the rate of deterioration of concrete, permeability is the parameter that directly influences, especially in situations where concrete is exposed to moisture. Currently there are no reference values that allow to know the degree of permeability of concrete with additions, which is known that improve by additions, such as microsilica (MS) and Metakaolin (MK). The purpose of the present work is to quantify the effect of small amounts of MS (5-10%) and MK (10-15%) on concrete permeability. The mixtures, which were use, correspond to w/c ratios of 0, 40 to 0, 60 and tests were carried out at 28 and 56 days. The permeability coefficient k was measured by applying a hydrostatic pressure difference between the two faces of the specimens. The flow of water passing through the specimens, or the depth of penetration in the material, was measure and the results show a significant reduction in k with MS and MK additions. For 10%MS the K parameter obtained was 0.95×10-13m/s;in case of 15% MK this K value was 0.61x10-13m/s.