·With aggregate of aggregate crushing value 30 or higher the result may be anomalous and in such cases the ten percent fines value should be determined instead 2 apparatus required Fig 1 Balance Balance should be accurate upto 1 gm Fig 2 Sieve mm mm and mm
·1SCOPEThis Standard sets out the method for determining the crushing value of coarse aggregate The test is performed on dry material and is carried out in duplicate The standard aggregate size for testing is − mm mm Provision is made for testing other size fractions see Clause 8
·specified or higher crushing strength Fig Aggregate Crushing value Fig Mould and plunger Testing Machine Aggregate Crushing value Testing Machine % §· u¨¸ ©¹ W2 Aggregate crushing value W1 W 1 = Total weight of the sample W 2 = weight of crushed aggregate Table Aggregate Crushing value test
·The crushing characteristics of coarse aggregates for asphalt concrete were investigated under static and dynamic aggregate crushing value tests ACVTs The effect of various compaction loads was also examined by using a Marshall hammer gyratory compactor and steel roller Six types of coarse aggregates were tested including basalt
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AGGREGATE CRUSHING VALUE This test helps to determine the aggregate crushing value of coarse aggregates as per IS 2386 Part IV 1963 The apparatus used is Cylindrical measure and plunger Compression testing machine IS Sieves of sizes 10mm and Procedure to determine Aggregate Crushing Value i The
b The aggregate crushing value ACV of an aggregate is the mass of material expressed as a percentage of the test sample that is crushed finer than a mm sieve when a sample of aggregate passing the mm and retained on the mm sieve is subjected to crushing under a gradually applied compressive load of 400 kN
Determination of Aggregate Impact Value Impact Test on Aggregates is done to carry out to Determine the impact value of the road aggregates Assess their suitability in road construction on the basis of impact value Aggregate Impact Value on Coarse Aggregates Apparatus for Aggregate Impact Test
·The aggregate crushing value provides a relative measure of resistance to crushing under gradually applied crushing load The test consists of subjecting the specimen of aggregate in standard mould to a compression test under standard load conditions Figure 1 Dry aggregates passing through mm sieves and retained 10 mm sieves are filled
·This document gives the determination of aggregate crushing value ACV of aggregates This gives a relative measure of the resistance of the aggregate crushing under the gradually applied compressive load The method is applicable to aggregates passing a 14 0 mm test sieve and retained on a 10 0 mm test
PRINCIPLE The aggregate crushing value gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load Crushing value is a measure of the strength of the aggregate The aggregates should therefore have minimum crushing value 3
Aggregate may be natural manufactured or recycled natural aggregate aggregate from mineral sources which has been subjected to nothing more than mechanical processing manufactured aggregate aggregate of mineral origin resulting from an industrial process involving thermal or other modification recycled aggregate aggregate resulting from the
3 ·Bullas and West [4] reported the aggregate impact value did not but the aggregate crushing value did separate suitable and unsuitable aggregate for bitumen macadam roadbase Fookes Gourley and Ohikere [5] recommended that combinations of physical tests such as impact crushing and abrasion resistance be used to assess
·The crushing characteristics of coarse aggregates for asphalt concrete were investigated under static and dynamic aggregate crushing value tests ACVTs The effect of various compaction loads was also examined by using a Marshall hammer gyratory compactor and steel roller For the purpose of comparison the breakage ratio
·Sieve the test material through mm and mm IS sieve Take test samples of aggregates passing through mm IS sieve and retained on 10 mm IS sieve minimum 3 Kg ; Dry theme in an oven for 4 hours at a temperature of 100 °C to 110 °C and then cool at room temperature
·IS 9376 1979 1 SCOPE This standard covers requirements of the apparatus for measuring aggregate crushing value and ten percent fines value Two sizes of apparatus are covered in this standard one with 150 mm cylindrical cell and the other with 75 mm cylindrical cell 2
·The aggregate crushing value gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load With aggregate of aggregate crushing value 30 or higher the result may be anomalous and in such cases the ten percent fines value should be determined instead 2 apparatus required
·Aggregates used in road construction should be strong enough to resist crushing under traffic Toughness is the property of a material to resist impact The aggregate impact value is expressed as the percentage of the fines formed the total weight of the sample Aggregate Impact Value AIV = 100 M2 /M1 Where M1 =Mass of
Angeles abrasion test was carried out in accordance with ASTM C131 96 1996 to determine abradability of the basalt aggregates As seen in Table 6 the Los Angeles abrasion values after 500
·The second part of the chapter describes the mechanical properties of aggregates such as aggregate impact value aggregate crushing value aggregate abrasion value Los Angeles value and aggregate crushing strength and aggregate durability expanded with soundness properties alkali reactivity reactions and frost susceptibility
·BS 812 110 1990 is maintained by B/502/6 This standard is available from the following sources BSI Knowledge British Standards Online BSOL
·Aggregates used in road construction should be strong enough to resist crushing under traffic Toughness is the property of a material to resist impact The aggregate impact value is expressed as the percentage of the fines formed the total weight of the sample Aggregate Impact Value AIV = 100 M2 /M1 Where M1 =Mass of
Aggregate Crushing Value ACV is an index of loss of coarse aggregate CA under sustained loading However ACV is not considered in concrete mix design according to ACI ACI 2009 In this paper effect of ACV of CA on compressive strength of concrete has been explored Coarse Aggregate was collected from five different sources
·BRITISH STANDARD BS 812 110 1990 Testing aggregates — Part 110 Methods for determination of Licensed copy MLA Cornwall Public CAT Cornwall Enquiry and Information Service Version correct as of 20/09/2011 15 09 c
·Six aggregates sampled from different sources were subjected to various aggregate tests including the Los Angeles abrasion micro Deval soundness magnesium and acid insoluble tests A Superpave mix with a mm 1/2 in nominal maximum aggregate size gradation was produced with each aggregate source using the same PG
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