Abstract
The incorporation of pozzolanic materials in the manufacturing of blended cement has a positive effect on the improvement of blended mortar and concretes performances. These active additions modify porous structure, impeding or delaying the access of aggressive solutions and, therefore materials more durable are possible of obtaining. An increase or decrease on the durability of blended pastes, mortars and concretes will depend on chemical and mineralogical compositions, fineness and reaction kinetics of these pozzolans. The current work shows the results of a research carried out in blended pastes to know the effect of activated material (metakaolin) on the microporosity of pastes elaborated with different amounts of mk (0-25%). A water/ binder ratio of 0,55 was used. Samples were cured at 20oC for 360 days. The evolution of total, capilary and gel porosity as well as average pore size were carried out through mercury intrusion porosimeter (MIP). Also, the helium pycnometer as alternative method to obtain additional information about porosity above 1,4 A was used. A good correlation between both methods has been obtained. In addition, it is proposed the best mk content for the elaboration of mk-blended pastes.
Highlights
El cemento portland es el material más utilizado en el sector de la construcción, por las ventajas que ofrece frente a otros materiales
Pastes with mk showed a 60%) of gel pores higher than those of control paste. As it happened with capillary porosity, the refineness of pore sizes was more important in pastes with high mk contents (15-25%))
Control paste showed a reduction of the average pore size from 40nm to 15 nm; while the blended pastes with high mk contents (15-25%)) reduced from 33nm to lOnm
Summary
The incorporation of pozzolanic materials in the manufacturing of blended cement has a positive effect on the improvement of blended mortar and concretes performances. These active additions modify porous structure, impeding or delaying the access of aggressive solutions and, materials more durable are possible of obtaining. The current work shows the results of a research carried out in blended pastes to know the effect of activated material (metakaolin) on the microporosity of pastes elaborated with different amounts of mk (0-25%). A good correlation between both methods has been obtained. It is proposed the best mk content for the elaboration of mk-blended pastes. (c) Consejo Superior de Investigaciones Científicas Licencia Creative Commons 3.0 España (by-nc) http://materconstrucc.revistas.csic.es
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