Aggregate crushing value is a numerical index of the strength of the aggregate and it is used in construction of roads and pavements Crushing value of aggregates indicates its strength Lower crushing value is recommended for roads and pavements as it indicates a lower crushed fraction under load and would give a longer service life and a more ... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.
The specified limits of pe cent aggregate crushing value N ote For strong aggregate crushing value should be low For surface courses this value should not exceed more than 30 and for courses not more than 45
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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 – 125mm 10mm and 236mm
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The aggregate crushing value ACV of an aggregate is the mass of material expressed as a percentage of the test sample which is crushed finer than a 2 36 mm sieve when a sample of aggregate passing the 13 2 mm and retained on the 9 50 mm sieve is subjected to crushing under a gradually applied compressive load of 400 kN 2 APPARATUS 21 An
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The strength of aggregate parent rock is determined by preparing a cylindrical shape specimens of size 25 mm diameter and 25 mm height This cylinder is subjected to compressive stress Depending on the type of parent rock gives different compressive strength varying from a minimum of about 45 MPa to a maximum of 545 MPa
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The sieves used of concrete aggregate consist of a series in which the clear openings or sieves are 475 mm 10 mm 20 mm 40 mm 80 mm for coarse aggregates 236 mm 118 mm 600 microns 150 microns for fine aggregates When as consecutive opening sizes are constantly doubled the lines at equal intervals represent successive sizes on a logarithmic scale
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Objective 1 Determine the aggregate crushing value of coarse aggregate 2 Assess suitability of coarse aggregates for use in different types of road Theory The aggregate crushing value give a relative measure of the resistance of
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The material is filled in 3 layers where each layer is tamped for 25 number of blows Metal hammer of weight 135 to 14 Kg is arranged to drop with a free fall of 380 cm by vertical guides and the test specimen is subjected to 15 number of blows The crushed aggregate is allowed to pass through 236 mm
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Crushing strength impact value abrasion resistance and elastic modulus of aggregate are interrelated properties that are greatly influenced by porosity Aggregates from natural sources that are commonly used for making normalweight concrete are generally dense and strong therefore they are seldom a limiting factor to strength and elastic
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The aggregate crushing value should not exceed 45 for aggregate used for concrete other than for wearing surfaces and 30 for concrete for wearing surfaces such as runways roads for pavements Aggregate impact value gives a relative measure of the resistance of an aggregate to sudden shock or impact As an alternative to
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