AS 1141.5:2000 pdf free download – Method for sampling and testing aggregates Method 5: Particle density and water absorption of fine aggregate

AS 1141.5:2000 pdf free download – Method for sampling and testing aggregates Method 5: Particle density and water absorption of fine aggregate.
(b) Drain the water off the test portion and spread the aggregate on a flat impervious surface.
(c) Surface dry the aggregate by exposing it to a gently moving current of warm air and stirring it frequently to achieve uniform drying.
(d) When the aggregate appears to be free flowing, fill the conical mould by loosely placing part of the test portion in it. Tamp the surface of the aggregate with the tamping tool 25 times, allowing the tamping tool to fall from about 10 mm above the surface of the aggregate.
(e) Lift the conical mould vertically. If free moisture is present, the cone of tine aggregate will retain its shape. If the cone slumps on removal of the mould the first time, the aggregate is too dry and additional water will need to be added and the test portion allowed to stand for 30 mm.
(1) Continue drying with constant stirring and retest at frequent intervals using the procedure in Steps (d) and (e) until the cone of aggregate slumps on removal of the mould. Slumping of the aggregate cone indicates that it has reached a saturated surface-dry condition.
(g) Immediately after the saturated surface-dry condition has been achieved, determine the mass (m2) of the total test portion.
(h) Place the test portion into the rolL1metric flask or pycnometer, as appropriate. Fill the flask to the 500 mL mark, or in such a manner that the same procedure used for determining the volume of the pycnometer has been followed (see Note). Determine the mass (m1) of the flask and its contents.
NOTE: A pycnometer with a stopper that has a constant volume mark included in the tube or pycnometer with a flat ground lop and lid has been found suitable.
(i) Top up the pycnometer with water and slide the lid on. or insert the stopper, making sure that no air bubbles are trapped. Dry the outside of the pycnometer and lid. Determine the mass of the pycnometer plus lid, or stopper, plus aggregate plus water
(#1 ).
NOTE: The mass of the pycnomctcr filled with water may be calibrated at regular intervals at the temperatures expected for the test or it may be determined immediately after the volume of aggregate has been determined.
(j) Remove the aggregate from the flask and place it in a dish, taking care not to lose any particles.
(k) Dry the aggregate in an oven at 105°C to 110°C to constant mass. Determine the mass (m1) of dry aggregate.
(I) Fill the flask with water at the same temperature as that measured in Step ) and determine the mass (nm4) of the filled flask.
REPORT
The following shall be reported, as applicable:
(a) The apparent particle density to the nearest 0.01 tIm’.
(b) Thc particle density on a dry basis to the nearest 0.01 tIm3.
(c) The particle density on a saturated surface-dry basis to the nearest 0.01 tm3.
(d) The water absorption to the nearest 0.1%.
(e) If the saturated surface dry condition was determined visually, give the reason why this was done.
(f) The number of this Australian Standard, i.e. AS 1141.5.