METHOD OF PREPARING WATERPROOF ADMIXTURE FOR WATERPROOFING AND ANTICORROSIVE TREATMENT OF CONCRETE, AND WATERPROOF ADMIXTURE PREPARED THEREBY

摘要

PURPOSE: A waterproofing agent comprising a mixture of inorganic and polymer-based waterproofing materials is provided to prevent water leakage, corrosion and degradation of concrete structures, increase strength, and improve workability. CONSTITUTION: The acrylic copolymer emulsion-based waterproofing agent is produced by the following steps of: (i) mixing excess stearate with ammonia water and heating the mixture to 90-100deg.C to form ammonium stearate with lubricancy and dispersion resulting in waterproofing; (ii) adding aluminum sulfate(Al2(SO4)3) and heating it to 120-140deg.C to form ammonium stearate resulting in strength and workability; (iii) adding an aqueous solution of Ca(OH)2; (iv) adding acrylic copolymer emulsion having 50-55wt.% of solid, 1.042-1.049 of specific gravity(20deg.C) and 5000-200000 of molecular weight; (v) adding a non-ionic surfactant such as polyoxyethylene nonylphenylether and anionic surfactant such as nonylphenol ethoxylated phosphate ester; (vi) adding Ca(OH)2 and silica, and optionally zeolite. The PVA/EVA-based waterproofing agent is also produced by adding PVA/EVA at the step (iv) and optionally talc at the step (vi).