FUNDAMENTAL STUDY SULFURIC ACID DEGRADATION ON MORTAR IMPREGNATED WITH SILICATE-BASED SURFACE PENETRANTS

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  • OSHIMA Syunichi
    KANAZAWA INSTITUTE OF TECHNOLOGY, College of Bioscience and Chemistry, Department of Applied Chemistry（7-1, Ohgigaoka, Nonoichi-shi, Ishikawa 921-8501, Japan）
  • OMIZO Naohide
    Former KANAZAWA INSTITUTE OF TECHNOLOGY, Graduate School of Engineering（7-1, Ohgigaoka, Nonoichi-shi, Ishikawa 921-8501, Japan）
  • MIYAZATO Shinichi
    KANAZAWA INSTITUTE OF TECHNOLOGY, College of Engineering, Department of Civil and Environmental Engineering（7-1, Ohgigaoka, Nonoichi-shi, Ishikawa 921-8501, Japan）
  • KUROIWA Daichi
    FUJI CHEMICAL CO., LTD, Technical Center, Team 21（1683-1880, Nakagaito, Nasubigawa, Nakatsugawa-shi, Gifu 509-9132, Japan）

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Other Title
  • けい酸塩系表面含浸材を塗布したモルタルの硫酸劣化に関する基礎的検討

Abstract

<p>In this study, a water permeability test, determination of neutralization depth by sulfuric acid and amount of sulfate ion penetration, and measurement of the Vickers hardness were performed using mortar impregnated with two kinds of silicate-based surface penetrants in order to evaluate the influence of silicate-based surface penetrants on sulfuric acid degradation. The shape of the mortar impregnated with the surface penetrants was maintained after sulfuric acid degradation. It was suggested that the use of the sodium silicate-based surface penetrants was suppressed the water permeability, the neutralization depth by the acid, and amounts of sulfate ion penetration because of suppression of surface porosity due to the remain of insoluble salts on the mortar surface after the sulfuric acid degradation. The sulfuric acid degradation at pH 2 in this study condition did not greatly affected the Vickers hardness of mortar. Therefore, it was considered that the modification effect by silicate-based surface penetrants was maintained after sulfuric acid degradation. As the results, it was suggested that the surface penetrants had the sufficiently modification effect on mortar even after the sulfuric acid degradation.</p>

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