Action Mechanisms And Performances Of Hydrophobizing Additives In Mortars

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Title: Action Mechanisms And Performances Of Hydrophobizing Additives In Mortars

Author(s): Alberto Lagazzo; Silvia Vicini; Angelo Nora; Rodolfo Botter

Publication: Special Publication

Volume: 305

Issue:

Appears on pages(s): 16.1-16.10

Keywords: fatty acid soaps; mortar durability; hydrophobicity; salt oleate; salt stearate; porosity

Date: 9/1/2015

Abstract:
Metallic soaps are salts from long chain fatty acids and they are popular as waterproofing due to their low cost and effectiveness. A detailed investigation on the mortar specimens made with different chemical additives based on Na oleate, Ca stearate – Na oleate, Al stearate and Ca - Na laurate has been performed. The additives analyzed present a different mechanism of action: Na oleate has a strong effect on the development of mortar microstructure while Al stearate or Ca - Na laurate leaves the microstructure very similar to that of the reference samples. The experimental evidences, by measuring the porosity, the water absorption, the mechanical properties and the morphology, confirm these internal structures in the mortars.