What is impact value definition?

What is impact value definition?

Definition(s): The assessed potential impact resulting from a compromise of the confidentiality, integrity, or availability of an information type, expressed as a value of low, moderate, or high.

Why aggregate impact value is important?

PURPOSE OF TEST: Aggregate Impact Value test determines the Aggregate Impact Value (AIV) of aggregates which provides a relative measure of the resistance of an aggregate to sudden shock or impact. Resistance of the aggregates to impact is termed as toughness.

What is impact test on aggregates?

The aggregate impact test value is a measure of resistance to sudden impact or shock, which may vary from its resistance to gradually applied compressive load.

How do you do aggregate impact value test?

The test sample shall be subjected to a total of 15 such blows each being delivered at an interval of not less than one second. The crushed aggregate shall then be removed from the cup and the whole of it sieved on the 2.36 mm IS Sieve until no further significant amount passes in one minute.

What should be the impact value of aggregates used in concrete?

Impact Value should not be less than 45\% for aggregates used for concrete other than wearing surface and 30\% for concrete used in wearing surface.

What is aggregate crushing value?

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 standardized conditions, and the strength of the aggregate used in road construction is expressed by numerical index.

What do you mean by bulking?

Explanation: The volume increase of fine aggregate due to presence of moisture content is known as bulking.

What should be the impact value of aggregates used in concrete *?

Should a good quality road aggregate give higher impact value?

Aggregate impact value is measure of toughness of aggregate. Tougher the aggregate more suitable for wearing surface such as road surface. Lower the impact value stronger the aggregate, again the impact these for good quality concrete , aggregate with lower AIV (Aggregate Impact Value) is prepared.

Why aggregate impact value test is done?

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.

Which type of aggregate gives good workability?

Which type of aggregates gives good workability? Explanation: The aggregates which gives more ease of working and workability is round aggregate, flaky and angular also used in some cases, irregular also are used in pavements.

What is the bulking of coarse aggregates?

What is bulking of coarse aggregates? Explanation: Bulking is indirectly proportional to the particle size of the aggregates. Size of coarse aggregates is more hence negligible bulking. Explanation: With the moisture content of 5 to 10\% by weight, the bulking of sand is increased by 50.

How do you calculate aggregate impact value?

Aggregate impact value is the ratio of the weight of the fraction passing through 2.36 mm (weight W2) by the total weight of the sample (weight W1 + W2). Aggregate Impact Value = (W2/ (W1+W2)) * 100 = 80 gm / 300 gm = 26.67 (Impact Value)

What is the need for impact value test?

The need for impact value test is used to measure 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.

What is the AIV of concrete aggregates?

Lower values indicate aggregates which are tougher or more impact resistant and higher strength concrete aggregates will exhibit AIVs of less than about 20 per cent but very few will produce AIVs of less than 10 per cent.

How do you determine the weight of aggregate in the measure?

The net weight of aggregate in the measure shall be determined to the nearest gram (Weight W A) and this weight of aggregate shall be used for the duplicate test on the same material. The impact machine shall rest without wedging or packing upon the level plate, block or floor, so that it is rigid and the hammer guide columns are vertical.