aggregate reaction test as per clause 5.6, where petrographic analysis is not carried out, if sample is tested and found conforming as per Chemical method [clause 5.6(1)] and ... 4 Aggregate impact value - Impact testing machine [Clause 4.2 (a) and Fig 2 of (Clause 5.4.2) IS 2386 (Part 4) : 1963]
Method of test for determining aggregate impact value of soft coarse aggregates (Reaffirmed 1998 Amds.1) IS 14685-1999 ... may also be used for this purpose provided that the liquid limit and plasticity index of such material are below 20 and 6 respectively and the fraction passing 75 micron sieve does not exceed 10 per cent. ...
1.1 This standard covers the procedure for determining the aggregates impact value of soft coarse aggregate used for bases and sub-bases of road pavements. 2. APPARATUS. …
Observations of Los Angeles Test Original weight of aggregate sample = W 1 g Weight of aggregate sample retained = W 2 g Weight passing 1.7mm IS sieve = W 1 - W 2 g Abrasion Value = (W 1 - W 2 ) / W 1 X …
Aggregate impact value = (W1/W2)*100. Aggregates to be used for wearing course, the impact value shouldn't exceed 30 percent. For bituminous macadam the maximum permissible value is 35 percent. For Water bound macadam base courses the maximum permissible value defined by IRC is 40 percent. Also read: Impact Value …
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 ...
The aggregate impact value is expressed as the percentage of the fines formed w.r.t the total weight of the sample. Aggregate Impact Value (AIV) = (100*M2)/M1. Where: M1 =Mass of the test specimen. M2 = Mass of …
Is:2386(PartIll)-1963 2.2 Method I - Aggregate Larger than 10 mm 2.2.1 4 b! 4 4 4 f > g> Apparatus - The apparatus shall consist of the following: Balance -A balance or scale of capacity not less than 3 kg, readable and accurate …
The average value of the two samples is the Impact Value of Aggregate. Lab Test Report Format. SI: Description: Sample 1 in grams: Sample 2 in grams: 1: Weight of dried sample (W1) 340: 360: 2: Weight of crushed particle passed through 2.36mm sieve (W2) 50: 65: 3: Impact value of Aggregate = (W2/W1) x 100: 15%: 18%:
Los Angeles machine consists of the circular drum of internal diameter 700 mm and length 520 mm mounted on a horizontal axis enabling it to be rotated. An abrasive charge consisting of cast iron spherical balls of 48 mm diameters and weight 340-445g is placed in the cylinder along with the aggregates. The cylinder is then locked and rotated …
Aggregate impact value = (W1/W2)*100. Aggregates to be used for wearing course, the impact value shouldn't exceed 30 percent. For bituminous macadam the …
17 likes • 29,532 views. Y. YASMINE HASLAN. LAB REPORT DETERMINATION OF AGGREGATE IMOACT VALUE. Education. 1 of 12. Download now. DCC3113 DETERMINATION OF AGGREGATE IMPACT VALUE. - Download as a PDF or view online for free.
Procedure of Aggregate Impact value test. The test sample: normally aggregates sized 10.0 mm to 12.5 mm. the aggregates should be dried by heating at 100-110 0C for a period of 4 hours and cooled. Sieve …
It is important to keep the amount of flaky and elongated aggregate within permissible levels. Generally, flaky and elongated aggregate are avoided or are limited to about 15 % by the weight of the total aggregate. Read …
IS: 2386 (Part 1)–1963, Method of test of aggregates for formation of concrete. IS: 383–1970, Specification for coarse and fine aggregate from natural source for formation of concrete. Procedure For The Test Flakiness Index of Coarse Aggregate :-. Sieve the aggregate sample with sieves specified in Table. Take sufficient quantity of ...
perimisible limits of aggregate impact value report. Determination of Aggregate Impact Value - Impact Test on 22 Feb 2010 Determination of Aggregate Impact Value - Impact Test on Aggregates is done to carry out to Determine the impact value of the road aggregates Assess thei. permissible limits of aggregate impact …
The procedure for conducting an Aggregate Impact Test (AIV) is as follows: Prepare the test sample by selecting aggregates sized between 10.0 mm and 12.5 mm. Dry the aggregates by heating at 100-110° C for 4 hours or until constant mass is achieved, and then cool them.
1.1 This standard covers the requirements for aggregates, crushed or. uncrushed, derived from natural sources, such as river terraces and river- beds, glacial deposits, rocks, boulders and gravels, for use in the Production of concrete for normal structural purposes including mass concrete works. 4. rS: 383 - 1910.
Specified limits of percent aggregate impact value for different types of road construction by Indian Roads Congress are given below: Sl. No. Type of Pavement
*Aggregate impact Value: IS:2386(Part IV) or IS:5640) 30 percent (Maximum) 2. ... If the amount of fine aggregate produced during the crushing operation is insufficient, non- ... not vary from the low limit on one sieve to the high limit on the adjacent sieve or the vice versa. The grading can be produced by crushing rock and may be an all-in ...
Aggregate Impact value. 17.54%. Max. 40%. 5. Maximum Dry Density. 2.18 g/cc--6. ... Frequency of testing Every 20cum or more frequency as decided by engineer in charge Permissible limit Acceptance standard -maximum permissible limit silt content shall not be " more than 8%" as per is code 383 and as per CPWD specification Note: (i) …
This ratio is known as the Aggregate Crushing Value (ACV) and can be calculated using the following formula: Aggregate Crushing Value (ACV) = (W2 x 100) / (W1 - W) Example limits. Here is a list of the Aggregate Crushing Value limits for different types of road construction: Types of Roads / Pavements: Flexible Pavements. Water …
The Aggregate Impact Value (AIV) (M2/M1)x100 19 % 23 %. AIV = M2/M1 * . Average aggregate impact value of the sample is 21 %. DISCUSSION 1. Give the …
The Aggregate Impact Value is used to classify aggregates based on their suitability for different types of road construction. The classification is as follows: ... 20-30%: Satisfactory for road surfacing >35%: Weak for road surfacing; The Indian Roads Congress provides specified limits of the percent Aggregate Impact Value for different types ...
The aggregate impact test is carried out to evaluate the resistance to impact of aggregates. Aggregates passing 12.5 mm sieve and retained on 10 mm sieve is filled in a cylindrical steel cup of internal dia 10.2 mm and depth 5 cm which is attached to a metal base of impact testing machine. ... And the impact value is measured as percentage of ...
Aggregate Impact Value (AIV) = B/A x 100. Where B = weight of aggregate passing through 2.36 mm sieve. A = weight of the oven – dried sample. Note. AIV should not be more than 45% for use in concrete other than wearing surfaces, and 30% for concrete used for wearing surfaces such as roads, runways and pavements.
The test sample shall consist of aggregate the whole of which passes a 12.5 mm IS Sieve and is retained on a 10 mm IS Sieve. The aggregate comprising the test sample shall be dried in an oven for a period of four hours at a temperature of 100 to 110°C and cooled.
The results obtained are well under the specified limits of standard. Aggregate impact value. This test is generally used to measure the hardness and toughness of an aggregate subjected to an abrupt load. The impact value of an aggregate is the relative measure of toughness and mechanical resistance against sudden impact load (Fookes et al. 1988).
Flakiness Index = [W 2 / W 1] x 100. Where, W 2 = Weight passed from 0.6 x d mean size. W 1 = Total weight of aggregates. Flakiness Index of aggregates used in road construction should be less than 15% and normally does not exceed 25%. It is not desirable to use flaky particles in construction of roads especially in surface course.
Aggregate Impact Value Classification. Less than 20%: Exceptionally strong. Between 10% and 20%: Strong. Between 20% and 30%: Satisfactory for road surfacing. …
Aggregate impact values are used to classify the stone aggregates with respect to toughness property as given below. Aggregate impact value (%) Toughness Properties. <10. Exceptionally tough / …
Explanation: According to IS: 2386 (Part IV)- 1963 for the Aggregate Impact Value, the aggregates must pass through 12.5 mm sieve and retain on 10 mm IS sieve. It also gives details regarding the other tests also. Important Points. The permissible limits for aggregate impact values are:
Weak aggregates may break down during mixing, handling and compaction. Within British Standards, the mechanical properties of aggregate can be assessed from 10 per cent fines value or aggregate impact value. In the 10 per cent fines test, a load is applied to the 14–10 mm fraction of the aggregate.
Maximum allowable aggregate impact value of aggregate in different types of pavement material / layers as per IRC is as below. 13. Aggregate impact …
IS : 2386 (Part IV) - 1963. b) A straight metal tamping rod of circular cross-section 16 mm in diameter and 45 to 60 cm long, rounded at one end. c) A balance ofcapacity 3 kg, readable and accurate to one gram. d) The IS Sieve-s of sizes 12.5, 10 and 2.36 mm.
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