Part iii scienceray the objective of this test is to determine the aggregate impact value in the laboratory. Determination of aggregate impact value impact test on aggregates is done to carry out to. Pdf adobe acrobathtmlmethod b7 the determination of the treton impact value of aggregate scope the treton value is a measure of the resistance of. 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. In this video, we will see the procedure of determining aggregate impact value as per is 2386 part4. Determination of aggregate impact value discussion and conclusion. Method for determination of aggregate impact value aiv british standard methods which give a relative measure of the resistance of. January 1, 2018 hard copies uncontrolled page 5 of 82 1. Lower the impact value stronger the aggregate, again the impact these for good quality concrete, aggregate with lower aiv aggregate impact value is prepared. Impact value is one of the properties used to evaluate. Aggregate impact value testing aiv test civil engineering. Dec 07, 2017 in this video, we will see the procedure of determining aggregate impact value as per is 2386 part4.
Aggregate on strength of mortar mortar strength effective date. Aggregate impact value test apparatus, procedure and uses. Determination of aggregate impact value construction. 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 strength of coarse aggregates is assessed by aggregates crushing test. Jan 12, 2017 the aggregates must thus have adequate rigidity to resist their breakdown due to excessive impact. Methods for determination of aggregate impact value aiv methods which give a relative measure of the resistance of an aggregate to sudden shock or impact. The determination of crushing value of slag is as follows. 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. Determination of aggregate impact value impact test on.
Determine the impact value of the road aggregates, assess their suitability in road construction on the basis of impact value. The apparatus used for determining aggregate impact value of coarse aggregates is impact testing machine conforming to is. Pdf adobe acrobathtmlmethod b7 the determination of the treton impact value of aggregate scope the treton value is a measure of the resistance of aggregate to impact. This video animation, animated video explains how to determine aggregate impact value aggregate impact test. 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. Specifies 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. Methods for determination of aggregate impact value aiv.
The determination of aggregate crushing strength is an important test in your civil engineering lab. Rosenau snake river conservation research center agricultural research service, usda kimberly, idaho 171 introduction 171. Determination of aggregate impact value impact test on aggregates. Crushing value apparatus acv, aggregates testing equipment. The impact machine shall rest without wedging or packing upon. 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. 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. Method for determination of aggregate impact value aiv purchase this standard. Aiv test is conducted to determine the aggregate impact value of coarse aggregate.
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. Determination of aggregate impact value construction aggregate. One of the requirements, for the suitability of aggregates for construction, is the ability of the aggregate to resist crushing. The aggregate crushing value acv provides relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load. Determination of aggregate impact value free download as word doc. Show full abstract each sieve is added and subtracted by 100 gives the value of fine aggregate. Determination of the angularity number of the given aggregate sample. Two procedures are described, one in which the aggregate is tested in a dry condition, and the other in a. Aggregate crushing value test on coarse aggregates gives a relative measure of the resistance of an aggregate crushing under gradually applied compressive load. Aggregate crushing value test determine aggregate crushing.
With aggregate of aggregate impact value aiv higher than 30 the result may be anomalous. This characteristic is measured by impact value test. Discussion a report the geological description of the aggregate, determination of aggregate impact value, aggregate crushing value and ten percent fines value. The apparatus used for determining aggregate impact value of coarse. Relative density and absorption of fine aggregate, astm c128. The aggregates must thus have adequate rigidity to resist their breakdown due to excessive impact. The aggregate impact value is a determining measure of resistance to sudden impact or shock, which may differ from its resistance to gradually applied.
To achieve a high quality of pavement, aggregate possessing low aggregate crushing value should be. 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. Toughness is the property of material which indicate its capacity which impact in sudden. Higher the aggregate size higher the fineness modulus hence fineness modulus of coarse 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. Aggregates are used in several construction processes such as in concrete, road construction etc. 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. Testing aggregates methods for determination of ten per cent fines value tfv bs 812112. May 08, 20 objective for determination of the aggregate crushing value of coarse aggregate, which passes 12. 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. Method for determination of aggregate impact value aiv british standard methods which give a relative measure of the resistance of an aggregate to sudden shock or impact. The aggregate impact value should not exceed 35% by weight for concrete wearing surface such as runways, roads, pavements, floors etc.
For determination of the aggregate impact value of coarse aggregate, which passes 12. Impact value of an aggregate is the percentage loss pf weight of particles passing 2. Classification of aggregates using aggregate impact value is as given below. 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. You know that aggregates are the one the basic unit of building materials. Standard test methods for determination of the impact value. Apparatus the apparatus of the aggregate impact value test as per is. 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. Methods for determination of particle shape flakiness index. Tougher the aggregate more suitable for wearing surface such as road surface. The aggregate crushing value provides a relative measure of resistance to crushing under a gradually applied compressive load. Ce 354 transportation engineering sessional i lab manual. The aggregate impact value should not exceed 45% by weight of the aggregate for concrete other than wearing surface.
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. Method b1 the determination of the aggregate crushing value 1 scope the acv of an aggregate as defined hereunder is determined by crushing a prepared confined aggregate sample under a specified, gradually applied compressive load and. The aggregate impact value gives a relative measure of the resistance of the aggregate to sudden shock or impact. Sep 05, 20 for the love of physics walter lewin may 16, 2011 duration. To determine the aggregate impact value in the laboratory. Determination of aggregate impact value discussion and. Pdf determination of the angularity number of the given. Standard test methods for determination of the impact. Standard test method for density, relative density and absorption of coarse aggregate, astm c127. Dec 15, 2017 dcc31 determination of aggregate impact value. Objective abrasion test is carried out to test the hardness property of aggregates. The aggregate crushing value gives a relative measure of the resistance of the aggregate to crushing under a. How to determine aggregate impact value aggregate impact test. It is supported on level and plane concrete floor of minimum 45 cm thickness.
For the love of physics walter lewin may 16, 2011 duration. Aggregate impact value is used to determine sustainability of aggregate due to dynamic loading. 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. Conclusion based on the result obtained, the percentage of impact value is 35.
Methods for determination of aggregate impact value aiv bs. This part of bs 812 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. How to determine the aggregate crushing strength value in. To achieve a high quality of pavement, aggregate possessing low aggregate crushing value should be preferred. Two procedures are described, one in which the aggregate is tested in a dry condition, and the other in a soaked condition. Methods of test for aggregates for concrete, part 4. The net weight of aggregate in the measure shall be determined to the nearest gram weight a. As we know, aggregates is an important material used for road construction, therefore, traffic loading will be the chief loading for a roadway. The test sample shall consist of aggregate the whole of which passes a 12. Testing aggregatesmethods for determination of aggregate crushing value acv, bs 812110.
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