1. Apparatus with an absorption tube in which water to be absorbed under the pressure of nearly 3mm H
2O 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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