| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
In this research, water transport properties of cracked cementitious materials were studied. First, water absorption experiment was conducted, with different crack widths, absorption directions and saturation degrees before absorption. Second, a two-phase transport model was established and the water absorption of ECC materials with different crack conditions were analyzed numerically. Since crack becomes convenient channel for water ingression from cracks to cement matrix, the absorption process was greatly accelerated. Such an accelerated process was well reproduced using the model. Then, mortars with internal hydrophobicity were made. Based on absorption experiment, it is confirmed that the specimens with surface coating, when crack occurred, lost their water repellency, whereas the internal hydrophobized specimens remained water repellent state. Therefore, the internal hydrophobized mortar is promising to be used in practice.
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