AS 1012.25.1 pdf download

AS 1012.25.1 pdf download.Methods of testing concrete
4  Apparatus and materials
4.1  Measure 4.1.1  General The measure shall be made of metal not less than 3 mm thick, be watertight and be sufficiently rigid to maintain its shape with rough usage. The inside surface shall be smooth and free from corrosion. The rim of the measure shall be machined to a plane surface perpendicular to the axis of the cylinder. NOTE  The measure should be provided with carrying handles. The diameter of the measure shall be between 0.75 and 1.25 times the height.For testing concrete with aggregates of nominal size not exceeding 40 mm, the capacity of the bowl shall be not less than 5 L. For testing concrete with larger aggregate, a larger bowl shall be used (e.g. for concrete with maximum 75 mm nominal size aggregate). A measure of capacity not less than 10 L shall be used. 4.1.2  Volume check The measure shall be checked at a known temperature by determining the mass in kilograms of water required to precisely fill it. Filling shall be achieved by sliding a flat glass cover plate over the overfilled measure such that no air is trapped under the cover. The capacity of the measure shall be obtained by dividing the mass of water so determined by the unit mass of water at that temperature, e.g. 997.5 kg/m 3 at 23 °C. When compacted as per this test method, the volume of the concrete sample (V c ) shall be the same volume as that determined for the measure, expressed to the nearest 0.02 L. 4.2  Balance A balance of sufficient capacity with a limit of performance as follows: (a) For mass determinations greater than 2 kg, a limit of performance not exceeding ± 5 g with an accuracy of at least 1 g. (b) For mass determinations less than 2 kg, a limit of performance not exceeding ± 0.5 g readable to 0.1 g.4.3  Rod The rod used for the compacting of concrete in the measure shall be a metal rod of 16 ± 1 mm in diameter, approximately 600 mm long and having at least one end tapered for a distance of approximately 25 mm to a spherical shape having a radius of approximately 5 mm. 4.4  Mallet The mallet used in conjunction with the rod for compacting of concrete shall be fitted with a hard rubber or hard plastics head of mass approximately 0.25 kg. 4.5  Scoop A scoop, shovel or other receptacle used for sampling concrete, with a capacity of not less than 1 L. 4.6  Glass cover plate A flat glass or plastic cover plate shall be used in the volume check of the measure. 4.7  Vibrators Internal vibrators used for the compacting of concrete shall have a frequency of vibration of at least 115 Hz. The outside diameter of the vibrating element inserted into the concrete shall be not more than 20 % of the least dimension of the measure. The outside diameter shall be at least 15 mm. External vibrators used for the compacting of concrete shall have a frequency of vibration of at least 50 Hz. The measure shall be clamped securely to the vibrator.4.8  Trowel or float An appropriate steel or wooden trowel or float should be used to smooth the surface of the concrete in the measure. 4.9  Magnet A magnet suitable for the collection of steel fibres. 4.10  Sieve or filter A sieve or filter equipment suitable for washing out cementitious material and other fine materials from plastic state concrete while retaining the fibres within the sample. 4.11  Isopropyl alcohol Technical grade isopropyl alcohol for use where synthetic fibres are being used.