2019 Volume 73 Issue 1 Pages 95-102
The purpose of this study is to investigate the effect of polymer content on resistance to water permeation and durability of polymer-modified mortars. Polymer-modified mortars using re-dispersible polymer powder and with fine aggregate cement ratio of 2 and 3, water-cement ratios of 45, 50, 55 and 60％, polymer contents of 0, 2, 4 and 6％ are prepared, and cured under 2d-wet＋5d-water＋21d-dry or 2d-wet＋26d-dry condition. Cured specimens are tested for water permeability, carbonation depth and chloride ion penetration depth. As a result, effective factors consist of water cement ratio, polymer content, air content and fine aggregate cement ratio water for the permeability, carbonation depth and chloride ion penetration depth of the polymer-modified mortar are proposed. Regardless of the type of polymer and curing condition, the good relationships are recognized for the water permeability, carbonation depth and chloride ion penetration depth of the polymer-modified mortars and the products of the those effective factors by the water permeability, carbonation depth and chloride ion penetration depth of unmodified mortar. The polymer content may be used as a new mix proportioning factor of the polymer-modified mortars.
