Water resistant cementitious article and method for preparing same

摘要

A method of preparing a water-resistant cementitious article comprising
(a) preparing an aqueous siloxane dispersion comprising from about 4 wt.% to about 8 wt.% siloxane in water, wherein the aqueous siloxane dispersion comprises dispersed siloxane particles having an average particle size of less than about 50 microns;
(b) combining the siloxane dispersion with a cementitious mixture to provide a cementitious slurry,
(c) depositing the cementitious slurry onto a substrate, and
(d) allowing the cementitious slurry to harden, thereby providing a water-resistant cementitious article.