Note 1 the aggregate crushing value gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load. Doc aggregate crushing value test lab report adnan. Advantages of aggregate impact value test products. Determination of aggregate impact value impact test on. Aggregate crushing value test determine aggregate crushing. In this case repeat the test on two further specimens, calculate the median of the four results to the nearest whole number and report the median as the aggregate crushing value. How to find aggregate crushing value and its test procedure. Contains the standard aggregate impact value pieces. Aggregate impact value test as per is code 2386 part4. However, it can be explain as the aggregate crushing value which is defined as a ratio of the weight. Aggregate impact value test apparatus, procedure and uses. 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. Doc aggregate crushing value test lab report adnan abir. Assess suitability of coarse aggregates for use in different types of road.
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. The aggregate crushing value give a relative measure of the resistance of. 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 impact value aiv test machine mechanical and. Classify the stone aggregates with respect to toughness property as given below. The value of aggregate impact test should not be more than 45% by weight of aggregates, used for concrete other than wearing surface. The cup shall be fixed firmly in position on the base of the machine and the whole of the test sample will be placed in it and compacted by a single tamping of 25 strokes of the tamping rod. Aggregate impact value ba x 100 where a weight in g of saturated surface dry sample. Experiment findings pdf available february 2018 with 8,362 reads. The methods are applicable to aggregates passing at 14.
As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any sizereduction requirements including, advantages of aggregate impact value test, quarry, aggregate, and different kinds of minerals. Maximum permissible impact value for the water bound macadam is 40%. Result introduction measure of degradation of mineral aggregates of standard grading resulting from a combination of action including abrasion and grinding in a rotation steel drum containing a specific number of steel spheres. This characteristic is measured by impact value test. Aggregate impact value to bs812112 impact test equipment. Pdf aggregate impact test find, read and cite all the research you need on researchgate.
To conduct a test to determine aggregate impact value of coarseaggregate. For determination of the aggregate impact value of coarse aggregate, which passes 12. Report the mean as the aggregate impact value, unless the individual results differ by more than 0. Aggregate impact value ba x 100 where a weight in g of saturated surface. 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. When you design pavements, the impact load is one of the challenging factors that you need to face. Apparatus the apparatus consists of an impact testing machine, a cylindrical measure, tamping rod, is sieve, balance, tamping rod and oven. From the data obtained and the aggregate impact value test aiv that we have done, it shows that our mean value from all three samples is 24. Aggregate impact value used to determine the impact value of aggregates and select them for a given application. The aggregate crushing value test is a useful guide when dealing with aggregates of unknown performance, particularly when lower strength is suspected. Determine the impact value of the road aggregates, assess their suitability in road construction on the basis of impact value. Oct 09, 2018 basically, the aggregates impact value is aggregate which provides a relative measure of the resistance of an aggregate to sudden shock or impact. Aggregate impact value gives a relative measure of the resistanceof an aggregate to a sudden shock or impact which differs fromcrushing strength.
The hammer shall be raised until its lower face is 15 in. Aggregate sizes larger than 14 mm are not appropriate to the aggregate impact value test. Apparatus the apparatus of the aggregate impact value test as per is. Aggregate crushing value test procedure and result. The ratio of the weight of fines formed to the total sample weight in each test shall he expressed as a percentage, the result being recorded to the first decimal place. Procedure the test sample consists of aggregates passing 12. Apparatus required for aggregate impact value test. 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 crushing value test lab report adnan abir. Annual aggregate report, 2008 june 22, 2010 pdf icon 2m.
Test aggregates are filled up to about onethird full in the cylindrical measure and tamped 25 times with rounded end of the tamping rod. Jan 12, 2017 the aggregates must thus have adequate rigidity to resist their breakdown due to excessive impact. Classification of aggregates using aggregate impact value is as given below. For smaller size fractions, a recommended method is described in an appendix to this standard. The device has a tripaction hammer release, blow counter device and a builtin operator safety device. Aggregates having more water absorption are more porous in nature and are generally considered unsuitable unless they are found to be acceptable based on strength, impact and hardness tests.
To find out the performance of aggregates for various uses, 7 types of lab test are available. Several attempts to develop a method of test for aggregates impact value have been made. Aggregate impact value test theory, procedure, apparatus and uses for pavement road, toughness is property of a material to resist impact. The test specimen includes the aggregates of size ranging from 10.
Resistance to degradation of smallsize coarse aggregate by abrasion and impact in. Aggregate impact value test important to determine. Determine the aggregate crushing value of coarse aggregate. Aggregate impact value testing aiv test civil engineering. To determine the aggregate impact value the required apparatus are given below. The apparatus used for determining aggregate impact value of coarse aggregates is impact testing machine conforming to is. Aiv test is conducted to determine the aggregate impact value of coarse aggregate. Scribd is the worlds largest social reading and publishing site. Aggregate crushing value provides the resistance of an aggregate sample to crushing under gradually applied compressive load. 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. In this case repeat the test on two further specimens, calculate the median of the four results to the nearest whole number and report the median as the aggregate impact value. Impact value of aggregate is an important test in your engineering lab. The standard aggregate impact test shall be made on aggregate passing a 14.
The impact value of an aggregate is the percentage loss of weight particles passing 2. The value is higher when more percentage of aggregates crush and break into smaller pieces which indicates the aggregates are of a lower quality. Aggregate crushing value test on coarse aggregates gives a relative measure of the resistance of an aggregate crushing under gradually applied compressive load. Report the mean as the aggregate crushing value, unless the individual results differ by more than 0. A close look at pattern of spread of concrete can also give a good indication of the characteristics of concrete such. 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. A quantity of aggregate shall be taken sufficient to provide the minimum number of 200 pieces of. Determination of the aggregate impact value of different coarse aggregate samples. Various lab test on aggregates posted in material testing.
Sep 05, 20 dry density of soil compaction test by core cutter method and calculations road construction civil. Used to determine the aggregate particle resistance to impact. Flakiness and elongation index of aggregate youtube. Uta0650 aggregate impact value aiv testing apparatus. Determination of aggregate impact value impact test on aggregates is done to carry out to. Generally, the test is conducted on aggregate passing 12. Water absorption gives an idea of strength of aggregate. The test sample shall consist of aggregate the whole of which passes a 12. Based from the aggregate impact standard, for the aggregate impact value of 24. Aggregate impact value ag220 alfa testing equipment. An impact value 35% is permissible for the bituminous macadam. Also aggregate sizes larger than 14 mm are not appropriate to the aggregate impact test. 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.
For this reason assessment of strength of the aggregate is made by using a sample of bulk aggregate in a standardized manner. Dec 26, 2019 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. 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 their resistance to a slowly applied compressive load. Dec 07, 2017 sign in to report inappropriate content. To find impact value of the given aggregate sample. The value could range anything from 0 to 150 percent. It is supported on level and plane concrete floor of minimum 45 cm thickness. This testing method is known as an aggregate crushing value test.
Ce 354 transportation engineering sessional i lab manual. The objective of this experiment is to determine the aggregate impact value which. Aggregates toughness property property of a material to resist impact 2. Determination of aggregate impact value impact test on aggregates. Abrasion test is the measure of aggregate toughness and abrasion resistance such as crushing, degradation and disintegration. Save page to pdf the page to pdf system has been restored. Tuberculosis laboratory aggregate report, third edition march 5, 2014 pdf icon 3.
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