This british standard, a part of the bs 812 series, describes methods for the determination of the aggregate impact value aiv which gives a relative measure of the resistance of an aggregate to sudden shock or impact. The indian standard code is 2386 part iv 1963 is used for procedure and classification of aggregate by result. 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. Dec 15, 2017 the aggregate impact value indicates a relative measure of the resistance of the aggregate to a sudden shock or impact which in some aggregates differs from its resistance to a slow compressive load.
Assess suitability of coarse aggregates for use in different types of road. Determine the impact value of the road aggregates, assess their suitability in road construction on the basis of impact value. The aggregate crushing value give a relative measure of the resistance of. Determination of the aggregate impact value of different coarse aggregate samples. For determination of the aggregate impact value of coarse aggregate, which passes 12. Some natural aggregate deposits, called pitrun gravel, consist of gravel and sand that can be readily used in concrete after minimal processing. The compaction machine incorporates the use of two different steel. In this video, we will see the procedure of determining aggregate impact value as per is 2386 part4. The apparatus used is cylindrical measure and plunger, compression testing machine, is sieves of sizes 12. 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. 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. Theory fineness modulus of coarse aggregates represents the average size of the particles in the coarse aggregate by an index number.
However, the aggregates impact value of the specimen for this laboratory experiment is 32. Aggregate impact value of material a is 15 and that of b is 35. This characteristic is measured by impact value test. The aggregate impact value gives a relation measure of the. Determination of aggregate impact value discussion and. Dec 07, 2017 in this video, we will see the procedure of determining aggregate impact value as per is 2386 part4. 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. Discussion a report the geological description of the aggregate, determination of aggregate impact value, aggregate crushing value and ten percent fines value. Apparatus the apparatus of the aggregate impact value test as per is. With aggregate of aggregate impact value aiv higher than 30 the result may be anomalous.
Determination of aggregate impact value impact test on. We present experimental evidence on the impact of a school choice program in the indian state of andhra pradesh ap that provided students with a voucher to finance attending a. Aggregate crushing value test on coarse aggregates gives a relative measure of the resistance of an aggregate crushing under gradually applied compressive load. Pdf experimental study of materials used in flexible. The aggregate impact value gives a relative measure of the resistance of the aggregate to sudden shock or impact. Asphalt stripping value test of aggregatestransportation. The apparatus used for determining aggregate impact value of coarse aggregates is impact testing machine conforming to is. 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. October 2019 sieve analysis of fine and coarse aggregates fop for aashto t 27 materials finer than75 m no. Asphalt stripping value is one the main test among these experiments. 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. The irc indian road congress explained the asphalt stripping value of aggregate should not be more than 25 percent. Jul 16, 2014 aggregate impact value test gives an indication of aggregates toughness property i.
It is calculated by performing sieve analysis with standard. When you design pavements, the impact load is one of the challenging factors that you need to face. Aggregate impact value test construction aggregate experiment. Within the cite this article tool, pick a style to see how all. Aggregate impact value aiv test machine mechanical and.
This test is done to determine the aggregate impact value of coarse. What do you understand by dry and wet impact value. 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. To determine the aggregate impact value the required apparatus are given below. The tests were carried out according to more detailed. Doc aggregate crushing value test lab report adnan abir. All bsi british standards available online in electronic and print formats. Aggregate impact value aiv aiv is the percentage of fines produced from the aggregate sample subjecting it to a standard amount of impact. Evidence from a twostage experiment in india karthik muralidharan venkatesh sundararaman 10 february 2015 abstract. This method of test covers the procedure for determining the aggregate impact value of coarse aggregate.
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 slowly applied compressive load. Methods of test for aggregates for concrete, part 4. From the calculations done we know that the aggregate can be acceptable as their aggregate impact value is less then 20% aggregate impact value 10. Aggregate impact value test construction aggregate. Methods for determination of aggregate impact value aiv this part of bs 812 has been prepared under the direction of the cement, gypsum, aggregate and quarry products standards policy committee. Aggregate samples for testing moisturedensity relations of soils using a 2. The aggregate impact value is a determining measure of resistance to sudden impact or shock, which may differ from its resistance to gradually applied. The test sample shall consist of aggregate the whole of which passes a 12. Determination of aggregate impact value impact test on aggregates is done to carry out to. If the aiv is less than 10%, the aggregates are exceptionally strong, but if aiv is in range 10% until 30% the aggregates have good strength resistance. Aggregate impact value test apparatus, procedure and uses.
The stripping value of bitumen or asphalt is obtained by means of visual experiment. Aggregate impact value % toughness properties aggregate impact value test. Aggregate impact value aiv is the percentage of fines produced from the aggregate sample after subjecting it to a standard amount of impact. Experiment to determine the aggregate impact value of different coarse aggregate samples, bs 812, aggregate impact value test, plain reinforced concrete skip to content civil engineers pk everything related to civil search. The aggregates must thus have adequate rigidity to resist their breakdown due to excessive impact.
The aggregate impact value indicates a relative measure of the resistance of the aggregate to a sudden shock or impact which in some aggregates differs from its resistance to a slow compressive load. 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. Determination of aggregate impact value impact test on aggregates. Determine the aggregate crushing value of coarse aggregate. It was observed that the impact value of aggregate. Jan 12, 2017 the aggregates must thus have adequate rigidity to resist their breakdown due to excessive impact. Conclusions and recommendations the national academies. 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 crushing value this test helps to determine the aggregate crushing value of coarse aggregates as per is. The latter combine the effect of shape, angularity, and texture. The impact value of an aggregate is the percentage loss of weight particles passing 2. Table 2 limiting values on mechanical properties for different types of concrete type of concrete 10 %.
Objective particle shape and surface texture influence the properties of freshly mixed concrete more than the properties of hardened concrete. Aggregate impact value to bs812112 aggregates impact. Aggregates for concrete bination of gravels or crushed stone with particles predominantly larger than 5 mm 0. Aggregate crushing value test determine aggregate crushing.
Scribd is the worlds largest social reading and publishing site. Increased particle index value or uncompacted voids in coarse aggregate also provide increased rutting resistance. Aggregate impact value testing aiv test civil engineering. It is supported on level and plane concrete floor of minimum 45 cm thickness. Aggregate impact value test gives an indication of aggregates toughness property i.
Roughtextured, angular, and elongated particles require more water to produce workable concrete than smooth, rounded compact aggregate. 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. Determination of aggregate impact value discussion and conclusion. Experiment to determine the aggregate impact value of different coarse aggregate samples, bs 812, aggregate impact value test. Aiv test is conducted to determine the aggregate impact value of coarse aggregate. Mar 21, 2018 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. 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. Uta0650 aggregate impact value aiv testing apparatus.