Abstract
The influence that water-repellent products can have on physical and micro-structural properties of lime mortars, and lime plus pozzolan mortars has been studied. Three water repellent products have been used. Mixes of the previously mentioned three water repellents plus a biocide product were also applied. Treatments make the total porosity and saturation coefficient of both mortars to decrease, while colorimetric coordinates bear little alteration. All treatments with water repellent products provided mortars with a hydrophobic property index close to 100%. Durability of such mortars has been also studied: salt crystallization test, frost-thaw and dry-wet cycles, as well as ultraviolet radiation test were carried out. Relationship between mortars behavior and their porosity and saturation coefficient were found.
Highlights
Three types of specimens: 1x1x0.5 cm and 3x5x0.5 cm prisms and 3x3x3 cm cubes were elaborated with two different kinds of mortar: lime mortars and lime plus pozzolan mortars
Total porosity of lime mortars decrease in all cases when applying the different water-repellent treatments previously described
Porosity decreases in both types of mortars due to the application of chemical treatments, in lime mortar, this descent is higher when chemicals do not contain biocide
Summary
Los morteros de cal y cal y puzolana son materiales de construcción que fueron ampliamente utilizados en la antigüedad (1), que perdieron importancia con la llegada del cemento Portland y que actualmente se intentan recuperar, principalmente para las obras de reparación. Las principales características que presentan estos materiales de construcción son: bajas
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