water absorption of concrete en standard

It shall then be spread out not more than one stone deep on the second cloth, and lest exposed to the atmosphere away from direct sunlight or any other source of heat for not less than 10 minutes, The first will remove no further moisture. The aggregate placed on the dry cloth shall be gently surface dried with the cloth, transferring it to the second dry cloth when.Shall be gently emptied from the basket on to one of the dry clothes. The basket and the aggregate shall then be removed from the water and allowed to drain for a few minutes, after which the aggregate.Times as described above in the new tank before weighing. If it is necessary for them to be transferred to a different tank for weighing, they shall be jolted 25 The basket and the sample shall then be jolted and weighed in water at a temperature of 22 to 32☌.The basket and aggregate shall remain completely immersed during the operation and for a period of 24 ± 1/2 hours afterwards.

The base of the tank and allowing it to drop 25 times at the rate of about one drop per second. Immediately after immersion the entrapped air shall be removed from the sample by lifting the basket containing it 25 mm above.Immersed in distilled water at a temperature between 22☌ and 32☌ with a cover of at least 5 cm of water above the top of the basket. The sample shall be thoroughly washed to remove finer particles and dust, drained and then placed in the wire basket and Two tests shall be made, and it is recommended that the two samples should not be tested concurrently. If such material is used the fact shall be stated in the report. Aggregates which have been artificially heated shall not normally be used. An airtight container of capacity similar to that of the basketĪ sample of not less than 2000 g of the aggregate shall be tested.A shallow tray of area not less than 650 cm 2.Two dry soft absorbent cloths each not less than 75 x 45 cm.A stout watertight container in which the basket may be freely suspended.A wire basket of not more than 6.3 mm mesh or a perforated container of convenient size, preferably chromium plated and polished, with wire hangers not thicker than one millimetre for suspending it from the balance.Oven - A well ventilated oven, thermostatically controlled, to maintain a temperature of 100 to 110☌.Balance - A balance or scale of capacity not less than 3 kg, readable and accurate to O-5 g and of such a type and shape as to permit the basket containing the sample to be suspended from the beam and weighed in water.Aggregates having more water absorption are more porous in nature and are generally considered unsuitable unless they are found to be acceptable based on strength, impact and hardness tests. Water absorption gives an idea of strength of aggregate.

Water absorption of concrete en standard