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1 ·The balance is such a type and its shape also permits the basket containing the sample to be hung from the beam and weight in water 2 Oven The oven used for the test is well ventilated or thermostatically controlled to maintain the temperature of
·Normally the percentage of fines should fall between and If it falls outside this range conduct a new test at a load adjusted to bring the percentage of fines within the range of to Is it better to test the aggregate in wet or dry condition It is likely that testing the aggregate in a wet condition will yield a weaker
·The test specimen in a drop weight impact test is notched and the weight is dropped on the surface opposite that of the notch Like the other impact tests previously described the drop weight impact test is frequently used to test for a material s ductile to brittle transition temperature 4 Dynamic Tear Test
4 ·The Aggregate impact test is used to determine the aggregate impact value AIV which provides a relative measure of the resistance of a coarse aggregate to Preparation of Test Sample The test sample consists of aggregate the whole of which passes through IS sieve of and is retained on 10mm Then dry the sample in an oven at a
·Aggregate strength testing Strength tests are used to assess the suitability of aggregate for use in road stone or concrete They are indicator tests measuring the likely rather than the actual performance of aggregate Aggregate Impact Value AIV this is the measurement of the aggregates resistance to repeated and sudden force
·The apparatus of the aggregate impact value test as per IS 2386 Part IV 1963 consists of 7 A testing machine weighing 45 to 60 kg and having a metal base with a plane lower Place the plunger centrally so that it falls directly on the aggregate sample and does
·Crushing test and Impact test are very important to estimate strength and toughness characteristics of the road aggregate Extensive experimental procedures and different sets of equipment are required for these types of aggregate testing Therefore the objective of the study is to investigate whether the light compaction test can be a
·The test involves placing a sample of the aggregate along with steel balls in the presence of water The entire assembly is then rotated in a drum for a specified number of revolutions Fig 2 Deval Abrasion test During this process the aggregates undergo substantial wear and abrasion leading to the generation of fine particles and dust
·Fig 3 Impact Testing machine Weight of hammer is to kg and Height of Fall is 380±5 mm IS 2386 Part 4 1963 Methods of Test for Aggregates for Concrete Mechanical Properties Reaffirmed Dec 2016 test sample shall consist of aggregate the whole of which passes a mm IS Sieve and is
·PSD tests are usually performed by producers contractors or independent test laboratories Particle size determinations for aggregate samples are crucial to ensure their performance meets their intended use A gradation test or sieve analysis is conducted to determine the distribution of aggregate particles by size within a given sample
·Aggregate Impact Value percent = W2 / W1 × 100; Take the mean of two observations rounded to the nearest whole number as the Aggregate Impact Value Observations and Results The observations in the Impact Test are recorded including the total weight of the dry sample W1 gm weight of portion passing the mm sieve W2 gm and
·AGGREGATE IMPACT VALUE TEST Objective To estimate the aggregate impact value of given sample IS Standards used IS 2386 Part 4 1963 Need and scope The Aggregate Impact Value gives a relative measure of the resistance of an aggregate to sudden shock or impact which in some aggregates differs from its resistance to a slow
AGGREGATE IMPACT VALUE 1 INTRODUCTION Aggregate impact value AIV is the percentage of fines produced from the aggregate sample after subjecting it to a standard amount of impact It is the percentage loss of weight of particles passing 2 sieve by the application on load by mean of 15 blows of standard hammer and drop under specified test
The aggregate sample tested was removed from the mould and sieve through 2 sieve openings The aggregate fraction passing the 2 test sieve was weighted Repeated the test for the same batch of aggregate sample 5 RESULTS AND ANALYSIS Weight of sieve = 658 Test 1 Test 2 Test 2 Weight of cylinder steel cup g 3020 3020 3020
·impact value test AIV Each aggregate sample was tested in the laboratory for crushing value and impact value following the specification recommended by the BIS code Bureau of Indian Standards
·The sample used for the test the laboratory sample shall be as per Clause 7 NOTE National standards can also exist regarding the sampling 6 Apparatus Compression testing machine capable of applying any force up to 500 kN and which can be operated to give a uniform rate of loading so that the required force 400 kN is reached in 10 min
The strength of coarse aggregates is assessed by aggregates impact test The aggregate impact value provides a relative measure of resistance to crushing under a gradually applied compressive load To achieve a high quality of pavement lower aggregate impact value should be preferred Toughness is the property of a material to resist impact
·Objective To estimate the aggregate impact value of given sample IS Standards used IS 2386 Part 4 1963 Need and scope The Aggregate Impact Value gives a relative measure of the resistance of an aggregate to sudden shock or impact which in some aggregates differs from its resistance to a slow compressive property of a material to
·For deciding the suitability of soft aggregates in base course construction aggregate impact test is commonly used A modified impact test is also often carried out in the case of soft aggregates to find the wet impact value after soaking the test sample in water Maximum allowable aggregate impact value of aggregate in different types of
·Point load testing is used to determine rock strength indexes in geotechnical practice The point load test apparatus and procedure enables economical testing of core or lump rock samples in
·By following ASTM D75 for aggregate sampling and ASTM C702 for sample reduction a smaller size of aggregate test sample that is truly representative of the whole stockpile can be obtained for aggregate testing Aggregate sample reduction to maintain the characteristics of the aggregate lot is equally as important as the tests conducted on the
·The percentage of fines passing through a sieve was calculated to determine the aggregate impact value Sample 1 had a 17% impact value and Sample 2 was 15% both below the JKR requirement of 20% indicating the aggregates have medium toughness and resistance to crushing This characteristic is measured by impact value test The
2 ·The impact test on aggregate is carried out to know the response of aggregates to different kinds of loads that the aggregates will be subjected to during their service life The test is performed by exposing an aggregate sample to repeated immersions in saturated solutions of sodium or magnesium sulphate followed by oven drying One
