AS NZS 1141.7:2014 – Methods for sampling and testing aggregates Method 7: Apparent particle density of filler
AS NZS 1141.7:2014 – Methods for sampling and testing aggregates Method 7: Apparent particle density of filler.
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.
fbI Waler bath capabk of maintaining a constant temperature of 25 *0.1°C.
(C) Thcrmomecr a thermometer or other suitable temperature measuring device readable and accurate to 0.1 C.
(dl Glassware—consisting of the following:
(i) Densit 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 l05C to 110°C. If) Lk.s’iccaior—containing anhydrous silica gel.
(g) Vacuum s’cssei—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
S DILA1’OMF:TRlC l.IQI’ll)
The dilatomctric liquid shall be either of the following, as appropriate:
(bI Distilled or deionited water, when the tiller is known not to react with waler.
The test procedure shall be carried out on duplicate test portions as follows:
(a) Using the procedure prescribed in Appendix A, Steps (a) to Ig). weigh the density bottle and stopper when tilled with the dilatomeiric liquid and record the mass (mi).
(h) Dry the test portion of tiller 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 (m4)
(d) Add sufficient dilatometric liquid to cover the tiller and half till 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 S mm until no further bubbles appear.
Ic) 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 ot’the density bottle.
(f) After 30 mm. 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.
The volume of the density bottle shall be determined in accordance with the following procedure:
ta) Remove any static charge from the clean, dry density bottle by wiping it with a clean. lint-free cloth which has been slightly dampened with water.
(b) Weigh the density bottle and stopper to the nearest 0.000 I g and record the mass (mi).
(c) Fill the bottle completely with distilled or dcioni,cd water.
(d) Immerse the bottle in the water bath set to 25 ±0.5°C. The level of water in the bath shall come to within approximately 5 mm of the top of the density bottle.
(e) After 30 miii. insert the stopper carefully so that no bubbles are trapped in the neck of the bottle and the excess water is expelled through the capillary in the stopper.
(f) After a further 10 mm. brush the top of the stopper with a slip of filter paper, holding the paper at an angle to ensure a tiat surface is passed over the capillary opening. Do not hold the bottle by hand during this process.
(g) Remove the bottle from the water bath, dry carefully, preventing any static charge and weigh immediately. Record the mass of bottle plus contents (m) to the nearest 0.04101 g.
NOTE: On removing from the water bath the boitlc should be handled gently by the neck to prevent distortion of the bottle sidcs using suitable tongs or gloves to prevent transfer of heat. static or contamination of the bottle. Calculate the mass of water in the bottle (m*13) by subtracting ne1 from m:.
(h) Calculate the volume of the bottle, in millilitres, at 25°C(V) as follows.