![]() NOTE 3 Cast specimens are normally used in comparative testing between a specified test concrete and an equivalent control. NOTE 2 Absorption values for cast specimens are normally slightly lower than those for a core from the same concrete but the difference can be more significant if the aggregate is absorbent. Knowledge of water absorption of the aggregate is critical when it comes to optimizing the mixing water content in the concrete and workabilty. The measured water absorption of the specimen is corrected to that equivalent to a surface to volume ratio of a core 75 mm long with a diameter of 75 mm. NOTE 1 The results from different types of specimens should not be compared. The method may also be used to determine the water absorption of concrete cast into prisms or cylinders where the surface to volume ratio can be calculated and where no point in the specimen is more than 50 mm from a free surface. In the first part of this experimental study, standard test methods for determining water absorption by concrete were carried out to determine the porosity of. No estimate of repeatability or reproducibility is given in. ![]() This Part of BS 1881 specifies a method for the determination of water absorption of concrete specimens cored from a structure or a precast component. The water absorption test in this Part is basically unchanged from that in the 1970 edition.
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