Performance of Silane-Type Impregnant and Flexible Polymer-Modified Cementitious Coating Material on Actual Structures after Long Term Exposure
Mikio WAKASUGI, Makoto YAMAMOTO, Hiroyuki SAKAKIBARA and Toyoaki MIYAGAWA
Abstract:Core specimens are drilled from the concrete structures repaired by silane-type impregnant and flexible polymer modified cementitious coating materials (PCM) after long term exposure to investigate the performance of those repair materials. Physical properties of the materials are measured and instrumental analysis are conducted to observe the condition of cement particles hydration and polymer film formation. Silane-type impregnant still maintains the performance after 20 years at the impregnated depth of 2-10 mm, also flexible PCM is more waterproof and water vapor permeable than initial. Adhesive strength of flexible PCM increased to twice the initial value after 5 years, and maintains the performance after 20 years. Elongation of the flexible PCM increased after 20 years although it decreased after 2 years. Hydration of cement didnft almost proceed and the polymer film had almost no damages after 20 years. Key Words:Silane-type impregnant, Flexible polymer-modified cement, Repair of concrete, Water permeability, Vapor permeability, Adhesive strength, Elongation