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AGGREGATE CRUSHING VALUE 1.Objective 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.
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Jan 13, 2011 Procedure to determine Aggregate Crushing Value i) The aggregates passing through 12.5mm and retained on 10mm IS Sieve are oven-dried 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 impact and crushing testLinkedIn SlideShare Aggregate impact and crushing test . is recorded to the nearestwhole number as the Aggregate Impact Value.The AIV is normally about 105 per cent of the Aggregate Crushing Value and itcan be used for the same purpose. . e.g.,Australia and New Zealand, only use the latter test.DISCUSSION(a) Report the geological description of the aggregate .
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This may be assessed by tests of aggregate impact value (AIV) and aggregate crushing value (ACV). The common rock types range in AIV from good (basic volcanic, dolerite, quartzite. quartz gravels), through fair (granite, gravels composed of igneous or metamorphic fragments) to poor (weathered igneous rocks, clay-rich gravels).
The selection of proper aggregate for a given application is essential to attain the desired quality. Made of Mild Steel comprising of: Cylindrical Cell, 150mm internal dia x 130 to 140mm height, Plunger, 148mm dia x 100 to 115mm height, Base Plate, 200 to 230mm square x 6mm thickness, Tamping Rod, 16mm dia x 450 to 600mm length.
Dec 15, 2017 Aggregate Impact Values and Aggregate Crushing Values are often numerically very similar, and indicate similar aggregate strength properties. Classification of aggregates using Aggregate Impact Value is as given below: Aggregate Impact Value Classification 20%.= Exceptionally Strong 10 – 20% .=Strong 20-30%. =Satisfactory for road surfacing ...
Now, take a bowl and measure its weight (X). Put the passed dust of aggregate through 2.36 sieve into a bowl. Take the weight of the bowl again with the aggregate sample dust (Y). Calculate the weight of passed dust, B = (X-Y) Now, the final report of aggregate impact value is calculated as,
Concept and significance of the Aggregate crushing value test The ‘ aggregate crushing value test gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load 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
Aggregate Crushing Value. of an aggregate to crushing. Made of Mild Steel. The selection of proper aggregate for a. of appropriate aggregate from the wide range. Rod, 16mm dia x 450 to 600mm length.
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Aggregate impact value (The value of aggregate impact test) = (W1/W2)*100. The value of aggregate impact test should not be more than 45% by weight of aggregates, used for concrete other than wearing surface. An impact value 35% is permissible for the bituminous macadam. Maximum permissible impact value for the water bound macadam is 40%.
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Aug 30, 2017 The Los Angeles test is a measure of degradation of mineral aggregates of standard gradings resulting from a combination of actions including abrasion or attrition, impact, and grinding in a rotating steel drum containing a specified number of steel spheres. The Los Angeles (L.A.) abrasion test is a common test method used to indicate aggregate toughness and abrasion
May 06, 2019 Penetration value of different types of bitumen used in road construction range between 20 to 225. However, 30/40 and 80/100 grade bitumen is more common for road construction depending upon the type of construction and climate conditions. In hot 30/40 bitumen is preferred. The value of temperature effects the use of the bitumen.
Therefore aggregate to be used in cement concrete should not be weaker than the strength of hardened cement paste. Determination of Crushing Strength of Aggregate: Material for the standard crushing test should pass through 12.5 mm I.S. sieve and retained on 10 mm I.S. sieve. The aggregate shall be thoroughly sieved on the above sieves before test.
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Aggregate Crushing Value Test Report Discussion. Aggregate impact and crushing testlinkedin slideshare aggregate impact and crushing test 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 egaustralia and new zealand only use the latter testdiscussiona report …
The value is higher when more percentage of aggregates crush and break into smaller pieces which indicates the aggregates are of a lower quality. 2. Aggregate crushing value 45% for aggregates used for concrete for non-wearing surfaces and 25% for wearing surfaces like …
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
with the rock strength. By comparing technical properties (Los Angeles (LA) value , aggregate crushing value (ACV), aggregate impact value (AIV) and 10 percent ﬁnes ag-gregate crushing test (10 % FACT)) with quantitative analysis (mineral grain size and mineral grain size distribution), it is possible to determine the mineral grain size corre-
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 12.5 mm sieves and retained 10 mm sieves are filled ...
Aggregate crushing value can be obtained from below formula: Aggregate crushing value = (W2/W1) *100 %. Abrasion Test on Aggregates Hardness property of aggregate is determined by conducting abrasion test. Los Angeles abrasion testing machine is used to conduct this test. For this test, the sample taken should be clean and dried.
Feb 25, 2012 Aggregate Crushing Value. 1.0 Introduction. The principal mechanical properties required in stones are satisfactory resistance to crushing under the roller during construction and adequate resistance to surface abrasion under traffic. Aggregates used in road construction, should be strong enough to resist crushing under traffic wheel loads.
Of an aggregate to crushing. Made of Mild Steel. The selection of proper aggregate for a. of appropriate aggregate from the wide range. Rod, 16mm dia x …
Aggregate crushing value = (W2 x 100) / (W1-W) W2 =Weight of fraction passing through the appropriate sieve W1-W =Weight of surface dry sample. The mean of two result to nearest whole number is the aggregate crushing value. Result The aggregate crushing value of the given sample= Aggregate Crushing Values for Roads and Pavement Construction
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 …
Oct 03, 2019 “Aggregate crushing value is determined by taking a percentage of weight crushed aggregate sample passing through 2.36 mm IS Sieve divided by weight of aggregate sample taken for test” Aggregate crushing value formula is given below, Aggregate crushing value = (W3 / W) or W3 / (W2 – W1) W1 = Empty weight of cylindrical Measure.
Calculation of Aggregate Crushing Value. The crushing value of aggregates is measured in the ratio between the crushed aggregates, obtained from the IS sieve 2.36mm 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