Aggregate impact test procedure pdf files

A record of calibration results is maintained at the field laboratory for the equipment listed in figure 61. Revision date description approval 1118 changes to manual dated january 1, 2017. Test procedures texas department of transportation. Aggregates may be dried by heating at 100110 c for a period of 4 hours and cooled. 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. Aiv test is conducted to determine the aggregate impact value of coarse aggregate.

This characteristic is measured by impact value test. This test is done to determine the aggregate impact value of coarse aggregate as per is 2386 partiv 1993. Fill the cylinder cup diameter 75 mm depth 50 mm in three layer with 25 gentle stroke each with tamping rod 10 mm in diameter and 230 mm long. Fill the cylinder with aggregate in 3 layers, 25 strokes of tamping for each layer. Transportation laboratory manual, civil engineering department, university of ilorin. Standard test method for resistance to degradation of. Toughnessabrasion resistance aggregates must be tough and abrasion resistant to prevent crushing, degradation, and disintegration when stockpiled, fed through an asphalt plant, placed with a paver, compacted. Test equipment calibration the equipment furnished for testing is required to be properly calibrated and maintained within the calibration limits described in the applicable test method. The aggregate impact value gives a relative measure of the resistance of the aggregate to sudden shock or impact. 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. 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.

Determination of the aggregate impact value of different coarse aggregate samples. Aggregate impact value test apparatus, procedure and uses. Road research laboratory ministry of transport rrl. The apparatus of the aggregate impact value test consists of. The test specimen includes the aggregates of size ranging from 10. It is supported on level and plane concrete floor of minimum 45 cm thickness. This video animation, animated video explains how to determine aggregate impact value aggregate impact test. Aggregate impact value test as per is code 2386 part4, hardness test of aggregate duration. Maximum permissible impact value for the water bound macadam is 40%. 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. Hard copies prior to january 1, 2015 are controlled. Weight of sample and cup weight of empty cup w1 gm.

This manual has the current versions of our laboratory test procedures. 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. Impact value of aggregate will give aggregate capability against sudden loads or forces. The aim of aggregate impact test is to determine the relative measure of the resistance of aggregate to sudden shock or impact in which in some aggregate differs from its resistance to a slowly applies compressive load. Experiment to determine the aggregate impact value of different coarse. The texas department of transportation txdot does not provide technical support with respect to these files. Level and plane concrete floor of minimum 45 cm thickness are used to support it. Updates are made to the electronic file as needed and hard copies are uncontrolled. T 248 reducing field samples of aggregate to testing size t 304 uncompacted void content of fine aggregate. The value of aggregate impact test should not be more than 45% by weight of aggregates, used for concrete other than wearing surface. The net weight of aggregate in the measure shall be determined to the nearest gram and this weight of aggregate shall be used the duplicate test on the same material. Determination of aggregate impact value impact test on aggregates. This test provides a method for measuring this strength.

Determine the empty weight m1 and the volume v of the cylinder at 270c. Just click on the names of the tests above to know the entire procedure of how we perform these tests. Procedure take representative sample of aggregate as required for the test according to maximum size of aggregate and the container required from table. By downloading files from this ftp service, you are agreeing to this license agreement. Uta0650 aggregate impact value aiv testing apparatus. The test sample shall consist of aggregate the whole of which passes a 12.

Updates are made to the electronic file as needed and hard copies. Aggregate impact value aiv test machine mechanical and. According to the standard specifications, materials failing the organic. To carry out the aggregate impact test, the followings are the procedures use. 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. Aggregate impact value the aggregate impact value gives a relative measure of the toughness or the resistance of aggregate sudden shock or impact is not proportional to the resistance to a slowly applied compressive load. Astm international construction standards supporting. The aggregates should therefore have sufficient toughness to resist their disintegration due to impact. Determination of aggregate impact value impact test on. Aggregate impact value test as per is 2386 partiv 1993. 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. If the dimensions of specimens are maintained as indicated in standards, notchedbar impact test results are affected by the lattice type of materials, testing temperature, thermomechanical history, chemical composition of materials, degree of strain hardening, etc.

The page impact test is not carried out nowadays and has also j. Pdf standard test method for resistance to degradation. Simple as it looks, it is a precise testing method giving repeatable and meaningful results but only when applied correctly. Manual for frequency of sampling and testing and basis for use of materials general the department standard specifications, section 106. The limitations on the amount of organic impurities allowed in fine aggregates are determined by the test method for organic impurities aashto t 21 and the test method for mortar strength aashto t 71.

Astm e 10, standard test method for brinell hardness of metallic materials. The property of a material to resist impact is known as toughness. This edition completely replacesy 201the 9 labofebruarratory manual of test procedures. 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. The theory and practice of the method are presented in the most complete way in the current standard. This test method determines the amount of material finer than the no.

Procedure of aggregate impact test the test sample consists of aggregates sized 10. Astm international helping our world work better standards catalog 2016. The sample is sieve through test sieves sizes of 14. Aggregates for concrete bination of gravels or crushed stone with particles predominantly larger than 5 mm 0. Laboratory tests for predicting coarse aggregate performance in ontario s. The impact machine shall rest with out wedging or packing upon the level plate, block or floor, so that it is rigid and the hammer guide columns are vertical.

This standard is issued under the fixed designation c 1. The test procedures are published in pdf format and may be accessed and printed upon acceptance of this agreement. 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. Impact test may either be carried out on cylindrical stone specimens as in page impact test or on stone 1aggregates as in aggregate impact test. An impact value 35% is permissible for the bituminous macadam.

Some natural aggregate deposits, called pitrun gravel, consist of gravel and sand that can be readily used in concrete after minimal processing. For determination of the aggregate impact value of coarse aggregate, which passes 12. Corresponding coarse aggregate specific gravity and absorption testing, utilizing the appropriate plus no. However, if a test was identical to an aashto, ast, or mftp procedure it was not m duplicated in this manual. 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.

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