CHLORIDE PENETRATION CHARACTERISTICS OF MORTAR SUBJECTED TO CONTINUOUS COMPRESSIVE STRESS INSIDE AND OUTSIDE ELASTIC LIMIT

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  • SAITO Junpei
    NIHON UNIVERSITY, College of Science and Technology, Department of Transportation Systems Engineering（7-24-1, Narashinodai, Funabashi-shi, Chiba 274-8501, Japan）

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  • 弾性限度内外の圧縮応力の継続付与を受けたモルタルの塩分浸透特性

Abstract

<p>This paper presents the results of several experiments on the chloride penetration characteristics of mortar subjected to continuous compressive stresses inside and outside elastic limit. The following experiments conducted on mortar specimens continuously subjected to compressive stress （stress strength ratio （σc/f’c）＝0, 0.15, 0.35, 0.50, 0.60）to obtain each experiment data. Calculation of apparent diffusion coefficient by salt submergence test, measurement of residual strain, measurement of pore diameter distribution by mercury intrusion porosimeter, and internal void condition by 3D X-ray CT image. The findings obtained are as follows. According to the apparent diffusion coefficient, the diffusion coefficient decreases with increasing σc/f’c until near the elastic limit, after which the diffusion coefficient increases with increasing σc/f’c. Even above the elastic limit, salt penetration resistance is high near the elastic limit, and the salt penetration resistance at σc/f’c＝0.50 is comparable to that at σc/f’c＝0. According to strain, microcracks occur at σc/f’c＝0.30～0.40. According to pore diameter distribution and 3D X-ray CT images, above the elastic limit, the pore volume increases significantly from 100nm to 5μm in pore diameter.</p>

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