nbspAggregate Impact Value is an ability or toughness of aggregates which resist sudden impact or shock load on it.Get A Quote
Also, it can be defined as the resistance of aggregate to failure by impact load is known as the Impact Value of Aggregate.
The Characteristics of any material to resist sudden impact is known as toughness. When we use aggregate in roads and pavement on which vehicular movement is done and there is a possibility of impact load on aggregate. This impact load can break aggregate in smaller pieces and which results in the failure of roads and pavements.
Therefore, aggregate used for such propose should have sufficient toughness to resist their disintegration due to the impact. This important property of aggregate is determined by the impact value test.
This resistance of aggregate may differ from resistance to gradual load which we measure in the crushing value test.
The need for impact value test is to find out the toughness of aggregates which is nothing but the ability of aggregates to resist the sudden loading or impact loading.
Find out the impact resistance of aggregate is important because, during service life, the aggregates will be actually subjected to this type of load. For example, aggregates will be subjected to impact after speed breaker, or when the vehicle is moving on the undulating road, etc.
nbspSo, by impact test, we can find out the response of aggregates to sudden loading. If the result is satisfactory, we use those aggregates in pavement. If not, aggregates are rejected.
Read More AGGREGATE CRUSHING VALUE TEST PROCEDURE AND RESULT.
10 FACT Ten percent nes aggregate crushing test. ACV Aggregate crushing value. Aggregates Crushed rock. Inselberg An isolated hill or small mountain that rises abruptly from a gently sloping or virtually level surrounding plain. Erosion remnant from an earlier mountain-range. AIV Aggregate impact.
Mar 21, 2018nbsp018332 Aggregate Impact Values, AIVs, below 10 are regarded as strong, and AIVs above 35 would normally be regarded as too weak for use in road surfaces. Aggregate Impact Values and Aggregate Crushing Values are often numerically very similar, and indicate similar aggregate strength properties. Recommended Aggregate Impact Test Values.
Feb 08, 2012nbsp018332When the test is repeated using the same aggregate, it is sufficient to directly weigh and take the same weight of sample This is because it is necessary to keep the volume and height of the test specimens in the aggregate crushing mould constant when testing any aggregate samplequotso that the test, conditions remain unaltered.
AGGREGATE IMPACT VALUE AIV This test provides a relative measure of the resistance of coarse aggregate to sudden shock or impact. Figure 2. 7 Aggregate impact value apparatus. AGGREGATE CRUSHING VALUE ACV This test provides a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load.
AGGREGATE CRUSHING VALUEThis test helps to determine the aggregate crushing value of coarse aggregates as per IS 2386 Part IV 8211 1963. The apparatus used is Cylindrical measure and plunger, Compression testing machine, IS Sieves of sies 8211 12.5mm, 10mm and 2.36mm.
Procedure to determine Aggregate Crushing Valuei The aggregates passing through 12.5mm and retained on 10mm IS Sieve are oven-dried at a temperature of 100 to 110oC 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.
Apr 28, 2016nbsp018332The aggregate should therefore have minimum crushing value. The aggregate crushing value provides a relative measure of the resistance of an aggregate to crushing under gradually applied crushing load. The aggregate crushing value test is a useful guide when dealing with aggregates of unknown performance, particularly when lower strength is suspected. To find out the performance of.
The average crushing value in the different tests is the actual crushing value of aggregate. Important points to remember 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.
Whether it is preferable if the aggregate crushing value is exactly 30 in construction of cc pavement.
How is the aggregate crushing value of non standard sie aggregate evaluated.
What is the range of aggregate crushing value for a good quality aggregate.
13. Aggregate impact valuesof soft aggregates for road constructions are as follows.
Aggregate crushing value test on coarse aggregates gives a relative measure of the resistance of an aggregate crushing under gradually applied compressive load. Aggregate crushing value is a numerical index of the strength of the aggregate and it is used in construction of roads and pavements.
Procedure of Impact Test. The procedure of the impact value test includes the following series of steps 1. The aggregate samples of sie 10mm to 12.5mm passing through 12.5mm sieve and retained on 10mm sieve are first taken and oven-dried at a temperature ranging from 100 degree Celsius to 110 degree Celsius for about four hours. 2.
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