AS NZS 1141.7:2014 pdf free download – Methods for sampling and testing aggregates
4 APPARATUS
The following apparatus, complying with the relevant provisions of AS 1141.2, is required:
(a) Balance—of at least 100 g capacity, with a limit of performance not exceeding ±0.005 g.
(b) Water bath—capable of maintaining a constant temperature of 25 ±0.1°C.
(c) Thermometer—a thermometer or other suitable temperature measuring device readable and accurate to 0.1°C.
(d) Glassware—consisting of the following:
(i) Density bottle, of 50 mL or 100 mL capacity and volume determined in accordance with Appendix A.
(ii) Small funnel.
(e) Oven—drying oven with operating temperature 105°C to 110°C.
(f) Desiccator—containing anhydrous silica gel.
(g) Vacuum vessel—capable of holding the density bottle and of withstanding the applied vacuum.
(h) Vacuum device—capable of reducing and maintaining the residual pressure in the vacuum vessel to below −90 kPa gauge pressure
5 DILATOMETRIC LIQUID
The dilatometric liquid shall be either of the following, as appropriate:
(a) Kerosene.
(b) Distilled or deionized water, when the filler is known not to react with water.
6 PROCEDURE
The test procedure shall be carried out on duplicate test portions as follows:
(a) Using the procedure prescribed in Appendix A, Steps (a) to (g), weigh the density bottle and stopper when filled with the dilatometric liquid and record the mass (m 3 ).
(b) Dry the test portion of filler for 4 h in the oven at a temperature of 105°C to 110°C and cool in the desiccator to room temperature.
(c) Clean and dry the bottle and add the filler through the funnel until the bottle is approximately one-third full. Weigh the bottle plus contents and stopper and record the mass (m 4 )
(d) Add sufficient dilatometric liquid to cover the filler and half fill the bottle. Release entrapped air by giving the bottle and its contents a few light taps or gentle swirls on the bench and then subjecting the bottle and contents to reduced pressure (approximately −90 kPa gauge pressure) in a vacuum vessel for at least 5 min until no further bubbles appear.
(e) Add further dilatometric liquid to fill the bottle completely then immerse the bottle in the water bath at 25 ±0.1°C. The level of water in the bath shall come to within approximately 5 mm of the top of the density bottle.
(f) After 30 min, insert the stopper carefully so that no bubbles are trapped in the neck of the bottle and the excess liquid is expelled through the capillary in the stopper.