セメントモルタルの毛細管吸水測定装置と測定結果

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1. Apparatus with an absorption tube in which water to be absorbed under the pressure of nearly 3mm H2O is preserved, is described, By the apparatus, contact absorption (A1) immediately after the specimen is placed on the water, subsequent absorption (A2) and evaporation (E) are measured.2. According to the result of blank test with non-absorptive specimens (brass), A1 and E showed mean errors of+0.22g and+0.31g respectively during the whole testing period of 168 hours.3. Capillary absorption was measured of 1:3 cement mortars, aged 7 or 28 (or 29) days and stored in water or in moist air. Total absorption (A1+Total A2) of moist-cured specimen is larger than that of water-cured; and total absorption of 7 day watercured specimen is larger than that of 28 day water-cured; The vales of A1 of moistcured samples are larger than those of water-cured.4. Mean deviations of total absorption from the averages are ±3.6% with watercuring, 7 days, and ±2.8% with water-curing, 28 days, and ±4.5% with moist-curing, 7 days, and ±6.1% with moist-curing, 29 days.5. It seems that effect of admixtures on the capillary absorption of the cement mortar can be determined by the apparatus.
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