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AGGREGATE IMPACT VALUE. This test is done to determine the aggregate impact value of coarse aggregates as per IS: 2386 (Part IV) – 1963. 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 …
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A small portion of 14–10 mm sized coarse aggregate particles is confined in a steel pot and subjected to 15 blows by a small hammer in a standardised test rig, after which the ‘ aggregate impact value’ (AIV) is determined from the fine material generated, expressed as a percentage of the original weight of the test portion (BS 812: Part 112: 1990 130). Lower values indicate aggregates which are tougher or more …
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What are the Types of Concrete Test Hammers? Two different versions of concrete test hammers generate different impact energies: Type N test hammers have an impact energy of 1.63ft-lbf (2.207Nm) that allows testing a wide range of concrete elements and structures. Type N hammers are used on concrete with thicknesses greater than 4in (100mm) and in-place strengths of 1,450 to 10,152psi (10 …
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Feb 10, 2021 · The hammer lifted to a maximum of 380 mm just above the top aggregate surface within the cup and seems to free to collapse on the specimen. After the test specimen has exposed to 15 blows, the crushed aggregate sieved on a 2.36 mm sieve created by the total weight of the sample. RESULTS:
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5.1 Impact Value, as determined using the standard 4.5 kg (10 lbm) hammer, has direct application to design and construction of pavements and a general application to earthworks compaction control and evaluation of strength characteristics of a wide range of materials, such as soils, soil aggregates, stabilized soil and recreational turf. Impact Value is one of the properties used to evaluate the strength …
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Mar 30, 2021 · Formula for Abrasion Impact test value. The ratio of aggregate which passes through the sieve to the total weight of sample in each test in terms of percentage is the impact value of aggregate. Now we compute the impact value using these two test using the formula below. Aggregate impact value = W2/ W1 *100. where,
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The points of impact on the specimen must not be nearer an edge than 20mm and should be not less than 20mm from each other. The same points must not be impacted more than once. Interpretation of Rebound Hammer Test Results After obtaining the correlation between compressive strength and rebound number, the strength of structure can be assessed
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May 21, 2020 · Aggregate Impact Value = (W2/ (W1+W2)) * 100 = 80 gm / 300 gm = 26.67 (Impact Value) Where, W1= Weight of the fraction passing through 2.36 mm IS sieve.(220 gm) W2= Weight of sample retained on 2.36 mm IS sieves. (80 gm) W1+W2 = Total Weight of Sample (220 + 80 = 300 gm) Result: The Aggregate Impact …
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Jul 01, 2019 · Remove the crushed aggregate from the cup and sieve it through 2.36 mm IS sieves until no further significant amount passes in one minute. Weight the fraction passing the sieve to an accuracy of 1 gm (W2). The fraction retained in the sieve is weighted. Note down the obversations in the proforma and compute the aggregate impact …
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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. The cup shall be fixed firmly in position on the base of the machine and the whole of the test sample placed in it and compacted by a single tamping of 25 strokes of the tamping rod
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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 100-110° C for a period of 4 hours and cooled
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Nov 22, 2019 · Rebound hammer test Factors Influencing Rebound Hammer Test. The rebound numbers are influenced by a number of factors like types of cement and aggregate, surface condition and moisture content, age of concrete and extent of carbonation of concrete. 1. Type of Cement
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Mar 30, 2020 · Aggregate Impact Test. Read definition, apparatus, IS code, procedure, observations, formula, result and lab report about aggregate impact value test. ... The hammer is raised until its lower face be 38 cm above the upper surface of aggregate in the cup and allow it …
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Aug 05, 2018 · The Hammer should be precisely pushed in right angle to the surface other intermediate angles show wrong results. Flaws cannot be detected easily, and periodic maintenance is must required. Rebound hammer test is influenced by various factors: type of cement & aggregate, atmospheric moisture and presence of moisture content in concrete
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Aggregate Impact Value. The test sample shall consist of aggregates the whole of which passes through ½ in B.S. test sieve and is retained on a 3/8 in B.S. test sieve. The aggregate comprising the test sample shall be dried in an oven for a period of four hours at a temperature of 100-110 °C and cooled.The measuring cup shall be filled about
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