AS 1012.23:2015 pdf free
AS 1012.23:2015 pdf free.Methods of testing concrete
The procedure shall be as follows:
(a) Cut a piece of fibreglass cloth large enough to completely wrap a 1500±50 g test specimen of freshly mixed concrete.
NOTE: The minimum size fibreglass cloth that has generally been found to be adequate is 0.5 m×0.5 m.
(b) Place the fibreglass cloth on the heat resistant tray with the cloth uniformly overhanging the outside edges of the tray.
(c) Determine the mass of the tray and cloth together (mz).
(d) Obtain a sample of freshly mixed concrete in accordance with AS 1012.1 or AS 1012.2 and scoop a test specimen of 1500±50 g from the sample.
(e) Within 5 min of mixing the composite sample, place the test specimen on the fibreglass cloth and wrap it completely with the cloth.
(f) Determine the mass of the tray, cloth, and freshly mixed concrete test specimen (m).
(g) Place the tray with the completely wrapped test specimen on the turntable in the microwave oven. Dry the test specimen with the turntable rotating for a period of 5 min and 30 ±10 s at the 900 W power setting.
For concretes with water/cementitious material ratio greater than 0.50 but less or equal to 0.60, test specimens shall be dried for a period of 6.0 min ±10 s.
(h) Immediately remove the tray and test specimen from the microwave oven and quickly unwrap the test specimen. With the edge of the scraper, break the mass of concrete until the coarse aggregate is separated from the mortar. Carefully grind the mortar with the pestle for no more than 1 min to expose a greater surface area. Ensure that no material is lost.
(i) Rewrap the test specimen; place the tray with the completely wrapped test specimen on the turntable in the microwave oven, and dry it with the turntable rotating 5 min and 30 ±10s at the 900 W power setting.
For concretes with water/cementitious material ratio greater than 0.50 but less or equal to 0.60, dry the test specimens for a minimum of 6.0 min±10 s.AS 1012.23 pdf free download.
