Pavement interactive was developed by the pavement tools consortium, a partnership between several state dots, the fhwa, and the university of washington, as part of their effort to further develop and use computerbased pavement tools. Determination of aggregate impact value impact test on aggregates is done to carry out. In this video, we will see the procedure of determining aggregate impact value as per is 2386 part4. The trapdoor is opened so that the concrete falls into the lower hopper. The aggregate impact value testing apparatus, meets with bs 812, it is robustly designed to determine the aggregate impact value aiv of aggregates which provides a relative measure of the resistance of an aggregate to sudden shock or impact. Accordingly, the relevant test methods may be chosen from amongst the various tests covered in this standard.
Aggregate impact value this test is done to determine the aggregate impact value of coarse aggregates as per. This edition completely replacesy 201the 9 labofebruarratory manual of test procedures. Aggregate impact and crushing test linkedin slideshare. The crushed aggregate is removed from the test specimen and sieve it through the 2.
The following procedure is applied, to find out the impact value of aggregate. Updates are made to the electronic file as needed and hard copies. Aiv test is conducted to determine the aggregate impact value of coarse aggregate. Aggregate crushing value test determine aggregate crushing. Just click on the names of the tests above to know the entire procedure of how we perform these tests. This testing method is known as an aggregate crushing value test. Procedure to determine aggregate impact value i the cup of the impact testing machine should be fixed firmly in position on the base of the machine and the whole of the test sample placed in it and compacted by 25 strokes of the tamping rod. Effect of basalt aggregates and plasticizer on the compressive. Aggregates may be dried by heating at 100110 c for a period of 4 hours and cooled. The particular purpose which an aggregate is meant to serve requires the aggregate to have a particular strength which is usually stated in the specification.
Aggregate sizes larger than 14 mm are not appropriate to the aggregate impact value test. The procedure of the impact value test includes the following series of steps. This degree is assessed by a sieving test on the impacted specimen and is taken as the aggregate impact value. For the convenience of the user, the test methods are grouped into the following eight parts of indian standard methods of test for aggregates for concrete is. The test sample shall consist of aggregates the whole of which passes through. To find impact value of the given aggregate sample. The test sample shall consist of aggregate the whole. Apparatus the apparatus consists of an impact testing machine, a cylindrical measure, tamping rod, is sieve, balance, tamping rod and oven. Toughness is the property of a material to resist impact.
Methods of test for aggregates for concrete, part 4. The sample shall be sieved with the sieves specified in table 1. This method of test used to measure the impact value of aggregate use in the construction of highway pavement and concrete structure. Coarse aggregate crushing value is the percentage by weight of the crushed material obtained when test aggregates are subjected to a specified load under standardized conditions. Aggregate crushing value test on coarse aggregates gives a relative measure of the resistance of an aggregate crushing under gradually applied compressive load. Mar 15, 2017 to ditermine the toughness of the aggregate by impact test for the love of physics walter lewin may 16, 2011 duration.
Find details of companies offering aggregate impact testing machine at best price. The impacts break the aggregate to a degree which is dependent on the aggregate s impact resistance. Pdf impact testing of concrete the measurement device. Download scientific diagram test procedure for aggregate impact value. This test method covers tests for flat particles, elongated particles, or flat and elongated particles in coarse aggregate. The aggregate impact value testing apparatus is robustly designed to determine the aggregate impact value aiv of aggregates which provides a relative measure of the resistance of an aggregate to sudden shock or impact. Introduction on aggregate impact testing machine ashian engineers company india by ashian team 2. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. However, if a test was identical to an aashto, ast, or mftp procedure it was not m duplicated in this manual. Aggregate impact value test construction aggregate. To measure the workability of concrete by compaction factor test apparatus required. For smaller size fractions, a recommended method is described in an appendix to this standard. Determination of aggregate impact value impact test on. Flat and elongated particles of coarse aggregates have a tendency to fracture more easily than other.
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 slow compression load. The test specimen is subjected to 15 numbers of blows each at not less than 1 second. The sample used for this test shall be taken in accordance with chapter 2. Generally, the test is conducted on aggregate passing 12. Procedure the test sample consists of aggregates passing 12. The charpy unotch impact test basically comprises of the test sample jagged in the midpoint and supported at all ends the test piece which is machined all over has to be at least 55mm long, 10mm x 10mm cross section and in the midpoint of length of flat, there will be a u notch of 5mm deep with 1mm root range. The aggregate comprising the test sample shall be dried in an oven for a period of four hours at a temperature of 100 to 110c and cooled. Determination of aggregate impact value impact test on aggregates. Different measurement techniques are used during the test procedure to study the relation of local damage and. Aggregate classification astm c125 significance of test apparatus procedure calculations results designation number. The loss of aggregate 1663 g the percentage of wear 33. Testing coarse aggregates for resistance to impact aggregates.
Procedure of aggregate impact test the test sample consists of aggregates sized 10. The methods are applicable to aggregates passing at 14. Aggregates for the test sample can be decided by passing it through 12. This manual has the current versions of our laboratory test procedures. References california test 201 soil and aggregate sample preparation. Note 1 the aggregate crushing value gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load. Manual of aggregate and concrete testing1 introduction this manual is intended to supplement, not in any way to supersede, the variousastm test methods for sampling and testing aggregate and freshly mixed and hardened portlandcement concrete.
Aggregate impact value aiv test machine mechanical and. The sample of concrete to be tested is placed in the upper hopper up to the brim. Jan 25 2018 aggregate impact value test aim to find impact value of the given aggregate sample apparatus the apparatus consists of an impacttesting machine a cylindrical measure tamping rod is sieve balance tamping rod and oven procedure the test sample consists of aggregates passing 125 mm sieve and retained on 10 mm sieve and dried in an oven. The manual was prepared by committee c09 on concrete and concreteaggregates and has been accepted. To determine the aggregate impact value of coarse aggregates as per is. Aggregate crushing value test procedure and result. The aggregate impact value gives a relative measure of the resistance of the aggregate to sudden shock or impact. With aggre gate of aggregate crushing value 30 or higher, the. An impact value is measured as % of aggregates passed through the 2. A quantity of aggregate shall be taken sufficient to provide the minimum number of 200 pieces of any fraction to be tested. In this text only flat and elongated particles in accordance with the procedure designated in method b will be covered. Uta0650 aggregate impact value aiv testing apparatus. Introduction on aggregate impact testing machine ppt.
May 07, 20 objective for determination of the aggregate impact value of coarse aggregate, which passes 12. Aggregate crushing value provides the resistance of an aggregate sample to crushing under gradually applied compressive load. Due to traffic loads, the road stones are subjected to the pounding action or impact and there is possibility of stones breaking into smaller pieces. This test method describes the procedure used to determine the resistance of coarse aggregate to impact in a rotating cylinder containing metallic spheres.
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