aggregate crushing value test report result conclusion grinding mill china

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In order to perform the LA abrasion test at various test grades and the modified compaction test with a single mould type the maximum size of the required aggregate was 19 mm For this reason particles larger than 19 mm were excluded from the 20mmaggregate samples in Table 4

The crushing value of coarse aggregate C c was calculated by equation C C c The fine RCA was divided into four groups of different particle size 5–25 mm 25–125 mm 125–063 mm and 063–0315 mm The mould was placed on a loading machine and loaded with 25 kN at a rate of 500 Ns and retained for 5s

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Traditionally the lowest operating cost was achieved by multi stage fully autogenous grinding due to elimination of steel grinding media costs which may represent up to 50 of the grinding cost

The original sample must be reduced to a test sample size which falls within the minimum and maximum weight in the following table WEIGHT OF TEST SAMPLE AGGREGATE SIZE MINIMUM MAXIMUM No1 68000 g 90700 g No2 11300 g No5 No 8 and No 91 6000 g 8000 g No 9 4000 g 6000 g No 11 2000 g No 12 1000 g

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51 This test method is used primarily to determine the grading of materials proposed for use as aggregates or being used as aggregates The results are used to determine compliance of the particle size distribution with applicable specification requirements and to provide necessary data for control of the production of various aggregate products and mixtures containing aggregates

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