AS 1141.54:2018 pdf free

AS 1141.54:2018 pdf free.Methods for sampling and testing aggregates
This Standard sets out the method for determining by visual examination the amount of foreign material in coarse aggregate produced from recycled concrete aggregate.The method is appropriate for material up to 75 mm nominal size and tests that fraction of the material retained on the 4.75 mm sieve.
WA RNING: CRUSHED CONCRETE AGGREGATE HAS BEEN KNOWN TO BE CONTAMINATED WITH ASBESTOS.
WHEN SAMPLING FROM STOCKPILES OR PREPARING SAMPLES IN THE LABORATORY, THE CRUSHED AGGREGATE SHOULD BE DAMP TO PREVENT GENERATING AIRBORNE DUSTS.
ON EXAMINATION, IF FIBROUS INORGANIC MATERIAL IS R EVEALED OR IF TH E AGGREGATE CONTAINS FLAT OR CURVED PARTICLES CLEARLY OF A MANUFACTURED ORIGIN (THAT IS SHEET OR PIPE FRAGM ENTS) SAMPLING OR TESTING SHOULD BE SUSPENDED.ANY SAMPLE AND SAMPLE CONTAINERS SHOULD BE SEALED INTO HEAVY DUTY PLASTIC BAGS WITH MINIMAL ADDITIONAL HANDLING AND THE SAMPLES DEALT WITH IN ACCORDANCE WITH A PPROPRIATE WORK, HEALTH AND SAFETY STANDARDS.
Foreign material is categorized as follows:
(a) Type I or high density material such as asphalt, breccia, brick, ceramics glass, metal,sandstone, shale or slag (not blast furnace slag).
(b) Type II or lowdensity material such as plaster, plastic, rubber, clay lumps and other friable material.
(c) Type III or organic matter such as wood, vegetable matter, paper, cloth, paint and bitumen.
A test portion shall be prepared as follows:
(a) Obtain a sample of material using the appropriate procedure detailedin AS 1141.3.1.
(b) Obtain, either by quartering or by the use of a sample divider, a subsample containing at least 2 kg and not more than 5 kg retained on a 4.75 mm sieve.
(c) Handle in a manner that will avoid breaking up any clay lumps that may be present.
(d) Record the wet mass of the subsample (Mw).
(e) Remove all clay lumps and friable material from the subsample and record their mass (mc).
(f) Dry the sub-sample to constant mass in the drying oven.
(g) Record the dry mass (M) of the sub-sample.
NOTE: If this test is performed in association with a particle size analysis, it is permissible to conduct a washed procedure in accordance to AS 1141.11.1 at this point and retain all sieve fraction retained on the 4.75 mm sieve as the test portion.AS 1141.54 pdf free download.