AS 1141.27:2015 pdf free
AS 1141.27:2015 pdf free.Methods for sampling and testing aggregates
Samples shall be obtained in accordance with AS 1141.3.1 when testing aggregate, and in accordance with AS 1141.3.2 if rock spalls are sampled to be crushed to provide material for the test portion. Obtain a bulk field sample of at least 60 kg of the aggregate to be tested if the test portion is to be prepared remote from the sampling site, or sufficient material to provide a test portion of at least 30 kg mass if the test portion is screened at the sampling site. The mass of spalls required will depend on the efficiency of the crusher used in preparing the test portion required.
The test portion shall be prepared as follows:
(a) Sieve the bulk sample over 53 mm and 37.5 mm sieves, and separate the material passing the 53 mm and retained on the 37.5 mm sieve. Discard the remainder of the sample.
(b) Discard any particles which are found to be misshapen when tested in accordance with AS 1141.14, using a proportional calliper ratio of 2:1.
(c) Discard any particle where the fractured edges have been rounded by mechanical handling processes.
(d) By quartering or other suitable means, divide the test sample into the required number of test portions of approximately 5 kg and adjust the mass of each test portion to within the mass of one stone by the addition or subtraction of stones. Discard excess material.
(e) Thoroughly wash the aggregate comprising each test portion, to remove all dust from its surfaces.
(f) Allow the moisture to evaporate from the surface or blot it off with a soft cloth, and subsequently oven dry the test portion to constant mass in an oven operating between 105°C and 110°C.
The apparatus employed, the mass of the test portions used, and the procedure followed shall be the same as the dry attrition test, except that a mass of clean water equal to the mass of each test portion is added with the test portion prior to the securing the cylinder covers.AS 1141.27 pdf free download.
