Analysis of coarse aggregate performance based on the ...

The apparatus of the aggregate impact value test consists of: A testing machine weighing 45 to 60 kg and having a metal base with a plane lower surface of not less than 30 cm in diameter. Level and plane concrete floor of minimum 45 cm thickness are used to support it.

Aggregate Impact value Test Apparatus, Procedure and uses ...

Calculate the mean of the two values determined in (a) or (b) of 7.6.6.2 to the nearest whole number. Report the mean as the aggregate impact value, unless the individual results differ by more than 0.15 times the mean value. In this case repeat the test on two further specimens, calculate the median of the four results to the nearest

Julia: How to compute mean by group using aggregate for ...

Jan 12, 2017· The aggregate impact value is a calculation of the resistance to abrupt impact, bang or shock, which may vary from its resistance to steadily, applied compressive weight. Procedure: The test specimen includes the aggregates of size ranging from 10.0 mm 12.5 mm. Aggregates can be dehydrated by warming them at temperatue of ° C for a ...

CE 354 Transportation Engineering Sessional I (Lab Manual)

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%. The price of aggregate impact testing machine is approximately Rs 4000 to 6000 ...

HOW AGGREGATE PROPERTIES AFFECTS CONCRETE ... - …

The aggregate impact value gives a relative measure of the resistance of an aggregate to "sudden shock or impact", which in some aggregates differs from its resistance to a slowly applied compressive load. With aggregate of aggregate impact value (AIV) higher than 30 the result may be anomalous. Also aggregate sizes larger than 14 mm are ...

Los Angeles Abrasion Test on Aggregates -Values for ...

Nov 30, 2017· 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. AIV should not be exceed 30 % for concrete used for wearing surface such as road work or runways or airport.

Aggregate Impact Value Test | Construction Aggregate ...

Results: The mean of the three results is reported as the AIV (Aggregate Impact Value) of the specimen to the nearest whole number. Limits : < 10% Exceptionally strong, 10–20% Strong, 20–30% Satisfactory for road surfacing & > 35%Weak for road surfacing.

CIVIL QUALITY CONTROL LAB: AGGREGATE IMPACT VALUE TEST

This percentage is known as a crushing value of aggregate. This percentage should not exceed 30% of the total weight of aggregate taken for the test. The aggregate crushing value test result should not be more than 30 % for the concrete used for roads and pavements and, in case of other structures; it may be permitted up to 45%.

Methods for determination of aggregate impact value (AIV ...

Aggregate impact value, not more than: 1. Wearing Course: 30: a) Bituminous surface dressing: b) Penetration macadam: c) Bituminous carpet concrete: d) Cement concrete: 2. Bitumen bound macadam base course: 35: 3. WBM base course with bitumen surfacing: 40: 4: Cement concrete base course: 45

Impact Value of Coarse Aggregate - Jaggu Dada

AGGREGATE IMPACT VALUE TEST Object of the Experiment To evaluate the toughness of a stone i.e. the resistance of the aggregates to fracture under repeated impacts is called Impact Test. This test is done to determine the aggregate impact value of coarse aggregate as per IS 2386 (Part-IV) 1993. Aggregate Impact Value Test as per Read More…

Aggregate Impact value test procedure - Civil4M

"The Elongation index of aggregate is the % by weight of the particles (aggregates) whose length is greater than 1 and 4/5 th (1.8 times) of their mean dimension." Objectives: This method uses to measure the Flakiness Index and Elongation index of aggregate use in the construction of Highway pavement and concrete structure.

Importance Of Aggregate Impact Value Test For Quarry Site ...

The aggregate impact value is a measure of resistance to sudden impact or shock, which may differ from its resistance to gradually applied compressive load. Procedure o f Aggregate Impact Test The test sample consists of aggregates sized 10.0 mm 12.5 mm. Aggregates may be dried by heating at C for a period of 4 hours and cooled.

IS 5640 (1970): Method of test for determining aggregate ...

Mar 27, 2020· The aggregate impact values are higher (on the average, by about 5) than the aggregate crushing values. Various agencies have specified the maximum permissible aggregate impact values for the different types of pavements, those recommended by the Indian Roads congress are given in Table 1.

Question is ⇒ If aggregate impact value is 20 to 30 ...

Feb 15, 2019· Aggregate impact value gives a relative measure of the resistance of an aggregate to sudden shock or impact, As an alternative to crushing value, the aggregate impact value should not exceed 45% by weight for aggregates used for concrete other than for wearing surfaces and 30% by weight for concrete for wearing surfaces, such as runways, roads ...

Aggregate Impact Value - Civil Engineering

aggregate impact value test reportconclusion BINQ Mining. Aggregate Impact Value Test Civil Engineering Sri Lanka . In construction of roads the aggregates should be in standard of R.D.A. To check that Aggregate impact value test is performed. If the AIV value is greater than 30 ?More detailed.

Impact Value Test of Aggregate - Procedures, Theory ...

Sep 05, 2018· Total weight not more than 60 kg nor less than 45 kg The Machine shall have a metal base weighing between 22 and 30 kg with a plane lower surface of not less than 3 cm diameter, and shall be supported on a level and plane concrete or stone block or floor at least 45 cm thick.

Procedure For Aggregate impact value - Jaggu Dada

Aggregate crushing value = (B/A) x . The aggregate crushing value for should not be more than 30% for road construction and not more than 45% for other than road construction building construction. AGGREGATE IMPACT VALUE This test is done to determine the aggregate impact value of coarse aggregates as per IS: 2386 (Part IV) 1963.

Los Angeles Abrasion - Pavement Interactive

Results: The mean of the three results is reported as the AIV (Aggregate Impact Value) of the specimen to the nearest whole number. Limits : < 10% Exceptionally strong, 10–20% Strong, 20–30% Satisfactory for road surfacing & > 35%Weak for road surfacing.

Aggregate Crushing Value Test - Learning Technology

The apparatus used for determining aggregate impact value of coarse aggregates is Impact testing machine conforming to IS: 2386 (Part IV)- 1963,IS Sieves of sizes – 12.5mm, 10mm and 2.36mm, A cylindrical metal measure of 75mm dia. and 50mm depth, A tamping rod of 10mm circular cross section and 230mm length, rounded at one end and Oven.

What is the impact value test of aggregate? - CIVIL Tips

The mean and median are 10.29 and 2, respectively, for the original data, with a standard deviation of 20.22. Where the mean is bigger than the median, the distribution is positively skewed. For the logged data the mean and median are 1.24 and 1.10 respectively, indicating that the logged data have a more symmetrical distribution.

Aggregate - coarse aggregates, testing & limits

Sep 06, 2018· 4 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. The fraction passing the sieve shall be weighed to an accuracy of 0.1 g. The faction retained on the sieve shall also be weighed and if, the total weight (B+C) is less than the initial weight by more than one gram the result ...

python - Remove groups with size smaller than mean group ...

res = IndexedTables.aggregate(mediocre, DT, by=(:id1,), with=:v3) id1 │ ────────┼──────── "id001" │ 45.9404 "id002" │ 47.0032 "id003" │ 46.0846 "id004" │ 47.2567 ... I hope you see that aggregating mean has impact to precision! (there is more sum and divide operations)


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