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Procedure for crushing strength of aggregate before testing the aggregate should be in surface dry conditionyou can achieve the dry condition of aggregate by placing aggregates in an oven for 4 hours at 100degree celcius the aggregates passing through 125mm and retained on 10mm is sieves are selected for finding aggregate crushing strength
For the aggregate crushing value test an aggregate sample passing through 125 mm is sieve and retained on 10mm is sieve is selected and dried to a temperature of 105 c to 110 c then cooled to room temperature to fill the cylindrical measure mould about 65 kg of a
Aggregate crushing value acv can be determined by using a simple formula this test is repeated once or twice and the average crushing value of the aggregate is determined the average crushing value in the different tests is the actual crushing value of aggregate important points to remember
Aggregate crushing value is defined as the percentage by weight of the crushed or finer material obtained when the test aggregates are subjected to a specified load under standardized conditions and the strength of the aggregate used in road construction is expressed by numerical index
Aggregate impact value is the ratio of the weight of the fraction passing through 236 mm weight w2 by the total weight of the sample weight w1 w2 aggregate impact value w2 w1w2 100 80 gm 300 gm 2667 impact value
Procedure of aggregate crushing value test put the cylinder in position on the base plate and weigh it w put the sample in 3 layers each layer being subjected to 25 strokes using the tamping rod care being taken in the case of weak materials not to break the particles and weigh it w1
Apr 28 2016 aggregate crushing test is standardized by is 2386 partiv and used to verify the crushing strength of aggregates the aggregates should be oven dried which can passes through 125mm and retained on 10mm sieve the cylindrical steel cup is stuffed in three layers of aggregate
The aggregates crushing value test should be performed as per is code 2386 part iv first fill the sample aggregate with onethird of the cylindrical measure in three layers each layer should be tamped 25times freely after filling the sample aggregate weigh and record it as w1
May 17 2019 aggregate crushing value is defined as the percentage by weight of the crushed or finer material obtained when the test aggregates are subjected to a specified load under standardized conditions and the strength of the aggregate used in road construction is expressed by numerical index
Procedure for crushing strength of aggregate before testing the aggregate should be in surface dry conditionyou can achieve the dry condition of aggregate by placing aggregates in an oven for 4 hours at 100degree celcius the aggregates passing through 125mm and retained on 10mm is sieves are selected for finding aggregate crushing strength
Aggregate impact value is the ratio of the weight of the fraction passing through 236 mm weight w2 by the total weight of the sample weight w1 w2 aggregate impact value w2 w1w2 100 80 gm 300 gm 2667 impact value
Jan 04 2014 procedure of testing aggregate crushing value acv 1 make a sieve analysis and get sufficient amount of aggregate by using 140 mm passing sieve and 1000 mm retained sieve 2 after sieving fill the cylinder in thre layers by the aggregate and apply 25 blows by the tamping rod with a approximate height of 50 mm 3
May 22 2020 for the crushing value test the following procedure is followed procedure for finding the crushing value of aggregate aggregate passing through a125mm is sieve and retained on 10mm is sieve is taken about 65 kg material is taken the aggregate in a surface dry condition is filled into the standard cylindrical measure in three layers approximately of equal depth each layer is tamped 25
Procedure to determine aggregate crushing value i the aggregates passing through 125mm and retained on 10mm is sieve are ovendried at a temperature of 100 to 110 o c for 3 to 4hrs ii the cylinder of the apparatus is filled in 3 layers each layer tamped with 25 strokes of a tamping rod
Aggregate crushing value w b w a 100 w b w a 100 where w a is weight of surfacedry sample w b is weight of fraction passing the appropriate sieve reporting of results the mean of the two results shall be reported to the nearest whole number as the aggregate crushing value
Procedure of aggregate impact value test the test sample normally aggregates sized 100 mm to 125 mm the aggregates should be dried by heating at 100110 0c for a period of 4 hours and cooled sieve the material through 125mm and 100 mm is sieves the aggregates passing through 125 mm sieve comprises the test material
Feb 08 2012 1 aresultsan average is taken of the two tests and the result is recorded to the nearestwhole number as the aggregate impact valuethe aiv is normally about 105 per cent of the aggregate crushing value and itcan be used for the same purpose
Sep 12 2015 then crushed aggregates are then sieved through 236 mm sieve and weight of passing material w2 is expressed as percentage of the weight of the total sample w1 which is the aggregate crushing value aggregate crushing value w1w2100 a value less than 10 signifies an exceptionally strong aggregate while above 35 would normally be regarded as weak aggregates also read
Oct 04 2020 procedure the aggregate passing 125 mm sieve and retained on 10 mm is sieve is selected for standard test the aggregate should be in surface dry condition before testing the aggregate may be dried by heating at a temperature 100o c for a period of 4 hours and is tested after being cooled to room temperature
The aggregate crushing value test indicates the strength of aggregate which is the most essential property of coarse aggregate the aggregate crushing value provides a relative measure of resistance to crushing under a gradually applied compressive load