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Calculation of Aggregate Crushing Value The ratio of weight of fines formed to the weight of total sample in each test shall be expressed as a percentage the result being recorded to the first decimal place Aggregate crushing value = W2 x 100 / W1 W W2 =Weight of fraction passing through the appropriate sieve
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Aggregate crushing Value percent =w2/w1 100 The ratio of the weight of fines formed to the total sample weight in each test is to be expressed as a percentage to the first decimal place Aggregate crushing Value = WB/WA 100 REPORT The mean of the two results is reported to the nearest whole number as the aggregate crushing value
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Values Values The term values may refer to interests pleasures likes preferences duties moral obligations desires wants needs aversions and attra… Intrinsic Value A thing s intrinsic value is the value it has in itself as opposed to the instrumental value it derives from causally producing something else Such… BOOK VALUE BOOK VALUE The current value of an asset
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150mm Aggregate Crushing Value Apparatus Supplied Complete with Metal Measure and Tamping Rod Comprising of 150 mm nominal diameter steel cylinder plunger and base plate supplied complete with metal measure and tamping rod info 42 4300 Tamping Rod 8mm Dia X 300mm Spare 8mm diameter x 300mm long with rounded end info 42 4580
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The aggregate crushing value gives a related action of resistance to crushing under a gradually applied compressive load For achieving a premium quality of pavement an aggregate of higher crushing strength such as reduced crushing value should be selected
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It is recommended that the crushing value of aggregate should be less than 30% If it is more than 30 % then 10% finer aggregate is suggested to use The aggregate whose crushing value is less than 30% can be used for cement concrete road The aggregate whose crushing value is less than 40% can be used for wearing surface
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Abrasion Test is the measure of aggregate toughness and abrasion resistance such as crushing degradation and disintegration The percentage wear of the sample aggregates due to rubbing with steel balls is determined and is known as Los Angeles Abrasion Value How Do You Find the Aggregate Abrasion Value Aggregate abrasion value = A B /B x 100%
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Objective For determination of the aggregates 10% fines value of coarse aggregate which passes mm IS sieve and retained on 10 mm IS sieve Reference Standards IS 2386 Part IV 1963 Methods of test for aggregate for concrete Part IV Mechanical Properties Equipment Apparatus Steel cylinder Sieves 10mm Cylindrical metal measure Tamping Rod […]
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This test gives the Aggregates Crushing Value ACV which is an index of crushing strength of aggregates The apparatus used for this test is Compression Testing Machine / Universal Testing Machine A sample of aggregates in surface dry condition which pass through the mm sieve and are retained on 10 mm sieve are taken for this test W1
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Then crushed aggregates are then sieved through mm sieve and weight of passing material is expressed as percentage of the weight of the total sample which is the aggregate crushing value A value less than 10 signifies an exceptionally strong aggregate while above 35 would normally be regarded as weak aggregates
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Aggregate Crushing value depends on the shape of agg also Angular aggregates have a lower ACV than Irregular or rounded we cut a core out of the same agg Say in the quarry and test for compressive strength will give a higher MPa value It can be considered as a concrete cylinder or UCS tested in lab So it is hard to corelate
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The Aggregate Crushing Value ACV Set Dia 75 mm provides a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load Used for the mm particle sizes aggregates AG1120 set consists of steel cylinder plunger base plate cylindrical measure and tamping rod
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The aggregate crushing value is the ratio of the mass of fines formed by the crushing process to the total mass of the sample expressed as a percentage Percentage fines = B/A x 100 to the first decimal place where A = The mass of the surface dry sample B =The mass of the fraction passing the sieve after
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The toughness of coarse aggregates can be evaluated by Aggregate Impact Value Test This test consists of subjecting an aggregate sample with an impact load This is unlike the aggregate crushing value test in which the sample is gradually loaded Standard Followed BS 812 Part 112 90 Specifications of Test Sample
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BS 812 Part 3 specifies a maximum limit of 30 for aggregates used in structural concrete and 40 on aggregates used in lean concrete • For crushing values of over 25 to 30 the test is insensitive because the weaker material is crushed before the 400 kN load is reached and compacted in a manner that further crushing is reduced
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Calculate the Aggregate Crushing Value ACV expressed as a percentage to the first decimal place of the mass of fines formed to the total mass of the test specimen from the following expression ACV = 100 x M2 / M1 Where M1 is the mass of the test specimen in grammes M2 is the mass of the material passing the test sieve in grammes
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The aggregate crushing value ACV provides relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load Two versions available 150 standard and 75 mm dia The apparatus comprehend cylinder plunger base plate tamping rod and measure Cylinder plunger and base plate are made from special alloy
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Aggregate Crushing Value ACV This gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load The test is similar to the one for AIV except that a load is gradually applied If the results of the AIV test and this one are 30 or more for an aggregate the result is unclear and
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The aggregate crushing value gives a relative measure of the resistance of an aggregate to crushing apply a gradually increasing compressive load The strength of aggregate is calculated by the crushing value test The aggregates used should be strong enough to with stand the stresses which comes on to it
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The Aggregate Crushing Value ACV test set provides a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load Each set consists of steel cylinder plunger base plate cylindrical measure and tamping rod All parts of the apparatus are powder coated or galvanized steel heat treated and ground
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The apparatus of the aggregate crushing value test as per IS 2386 Part IV 1963 consists of 1 A 15cm diameter open ended steel cylinder with plunger and base plate of the general form and dimensions as shown in Fig 1 2 A straight metal tamping rod of circular cross section 16mm diameter and 45 to 60
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The aggregate crushing value is calculated as a ratio of the weight of fines aggregate passing through the specified IS sieve to the total weight of the aggregate sample and is expressed as a percentage Where W₁ = Total weight of dry sample and W₂ = Weight of the portion of crushed material passing through mm IS sieve
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The aggregate crushing value formula is given below Aggregate crushing value = W3 / W or W3 / W2 W1 W1 = Empty weight of cylindrical Measure W2 = Weight of Aggregate with Cylindrical Measure W = W2 W1 = Weight of Aggregate Sample W3 = Weight of crushed aggregate sample passed through mm IS Sieve FAQs
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The aggregate crushing value is a numerical index of the resistance of an aggregate to crushing under a gradually applied compressive load It is expressed as the percentage by mass of the crushed or finer material obtained when the test sample is subjected to a specified load under standard conditions
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Aggregate crushing value = = Weight of fraction passing through the mm sieve / Weight of surface dry sample = W2 x 100 / W1 W Where W is the weight of empty cylinder Result The mean of the two results shall be reported to the nearest whole number as the aggregate crushing value of the size of the material tested
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Aggregate Crushing Value = W B W A ×100 W B W A × 100 Where W A is weight of surface dry 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 of the size of material tested Recommended Aggregate crushing value
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Aggregate Crushing Value % Aggregate Crushing Mean value % Sample calculations Sample1 Aggregate Crushing Value ACV = 100% = % Sample2 Aggregate Crushing Value ACV = 100% = % ACV for Sample A ACV for Sample B Aggregate Crushing Value ACV = 2 = 2 = %
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v The sample is then sieved through a IS Sieve and the fraction passing through the sieve is weighed Weight B vi Two tests should be conducted Results and Calculations Aggregate Crushing Value = B/A X 100 where A = weight of oven dried sample B = weight in g of fraction passing through mm sieve
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This video Animation Animated Video explains How to determine aggregate crushing value Aggregate Crushing Strength Aggregate test Coarse aggregate
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The crushing value of aggregates is measured in the ratio between the crushed aggregates obtained from the IS sieve and the weight of the dried aggregate sample At least three samples should be tested from the same batch and average value to get accurate results The crushing value of aggregate = W2/W1 x 100 Lab Report
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