Aggregate Impact Value Tester:
Aggregate Impact Value Tester:
Aggregate Impact Value Test Apparatus is utilized for deciding the total effect value.The Sturdy Construction comprises of a base and bolster segments to shape an unbending system around the brisk discharge trigger component to guarantee a viable free fall of the mallet amid test.The free fall can be balanced through 380 *5mm.The sledge is given a locking course of action. Total effect esteem test contraption is provided finished with a tube-shaped measure of 75mm dia x 50mm profundity, a programmed blow counter and a packing pole.
Assurance of Aggregate Impact Value – Impact Test on Aggregates is done to complete to:
1.Decide the effect estimation of the street totals,
2.Survey their reasonableness in street development based on affect esteem.
3.Total Impact Value on Coarse Aggregates
4.Device for Aggregate Impact Test
The device according to May be: 2386 (Part IV) – 1963 comprises of:
(I) A testing machine measuring 45 to 60 kg and having a metal base with a painted lower surface of at the very least 30 cm in distance across. It is bolstered on level and plane solid floor of least 45 cm thickness. The machine ought to likewise have arrangements for settling its base.
(ii) A barrel-shaped steel measure of inward distance across 102 mm, profundity 50 mm and least thickness 6.3 mm. .
(iii) A metal mallet or tup measuring 13.5 to 14.0 kg the lower end being barrel shaped fit as a fiddle, 50 mm long, 100.0 mm in width, with a 2 mm chamfer at the lower edge and callous. The sledge should slide uninhibitedly between vertical aides and be concentric with the container. Freefall of mallet ought to be inside 380±5 mm.
(iv) A tube-shaped metal measure having inside breadth 75 mm and profundity 50 mm for estimating totals.
(v) Tamping pole 10 mm in width and 230 mm since quite a while ago, adjusted toward one side.
(vi) An adjust of limit at least 500g, decipherable and exact up to 0.1 g.
Hypothesis of Aggregate Impact Test :
The property of a material to oppose affect is known as sturdiness. Because of development of vehicles out and about the totals are subjected to affect bringing about their separating into littler pieces.
The totals ought to in this way have adequate durability to oppose their crumbling because of effect. This trademark is estimated by affect esteem test.
The total effect esteem is a measure of protection from sudden effect or stun, which may vary from its protection from step by step connected compressive load.
Method of Aggregate Impact Test:
The test comprises of totals estimated 10.0 mm 12.5 mm. Totals might be dried by warming at 100-110° C for a time of 4 hours and cooled.
(I) Sieve the material through 12.5 mm and 10.0mm IS strainers. The totals going through 12.5mm strainer and held on 10.0mm sifter includes the test material.
(ii) Pour the totals to fill about only 1/3 rd profundity of estimating chamber.
(iii) Compact the material by giving 25 delicate blows with the adjusted end of the packing pole.
(iv) Add two more layers incomparable way, with the goal that barrel is full.
(v) Strike off the surplus totals.
(vi) Determine the net weight of the totals to the closest gram(W).
(vii) Bring the effect machine to rest without wedging or pressing upon the level plate, piece or floor, so it is inflexible and the sledge direct segments are vertical.
(viii) Fix the glass immovably in position on the base of machine and place entire of the test in it and smaller by giving 25 delicate strokes with packing bar.
(ix) Raise the mallet until the point when its lower confront is 380 mm over the surface of total example in the glass and enable it to fall uninhibitedly on the total example. Give 15 such blows at an interim of at least one moment between progressive falls.
(x) Remove the smashed total from the container and strainer it through 2.36 mm IS sifters until the point that no further critical sum goes in one moment. Measure the division passing the sifter to an exactness of 1 gm. Additionally, measure the portion held in the sifter.
Process the total effect esteem. The mean of two perceptions, adjusted to closest entire number is accounted for as the Aggregate Impact Value.
Prescribed Aggregate Impact Test Values:
Grouping of totals utilizing Aggregate Impact Value is as given beneath:
Total Impact Value Classification
<20% Exceptionally Strong
10 – 20% Strong
20-30% Satisfactory for street surfacing
>35% Weak for street surfacing
Indicated points of confinement of percent total effect an incentive for various kinds of street development by Indian Roads Congress is given beneath.
Sl No Type of pavement Aggregate effect esteem not more than
1. Wearing Course 30
a) Bituminous surface dressing
b) Penetration macadam
c) Bituminous cover concrete
d) Cement concrete
2. Bitumen bound macadam base course 35
3. WBM base course with bitumen surfacing 40
4 Cement solid base course 45
Aggregate Impact Value Test Apparatus is utilized for deciding the total effect value.The Sturdy Construction comprises of a base and bolster segments to shape an unbending system around the brisk discharge trigger component to guarantee a viable free fall of the mallet amid test.The free fall can be balanced through 380 *5mm.The sledge is given a locking course of action. Total effect esteem test contraption is provided finished with a tube-shaped measure of 75mm dia x 50mm profundity, a programmed blow counter and a packing pole.
Assurance of Aggregate Impact Value – Impact Test on Aggregates is done to complete to:
1.Decide the effect estimation of the street totals,
2.Survey their reasonableness in street development based on affect esteem.
3.Total Impact Value on Coarse Aggregates
4.Device for Aggregate Impact Test
The device according to May be: 2386 (Part IV) – 1963 comprises of:
(I) A testing machine measuring 45 to 60 kg and having a metal base with a painted lower surface of at the very least 30 cm in distance across. It is bolstered on level and plane solid floor of least 45 cm thickness. The machine ought to likewise have arrangements for settling its base.
(ii) A barrel-shaped steel measure of inward distance across 102 mm, profundity 50 mm and least thickness 6.3 mm. .
(iii) A metal mallet or tup measuring 13.5 to 14.0 kg the lower end being barrel shaped fit as a fiddle, 50 mm long, 100.0 mm in width, with a 2 mm chamfer at the lower edge and callous. The sledge should slide uninhibitedly between vertical aides and be concentric with the container. Freefall of mallet ought to be inside 380±5 mm.
(iv) A tube-shaped metal measure having inside breadth 75 mm and profundity 50 mm for estimating totals.
(v) Tamping pole 10 mm in width and 230 mm since quite a while ago, adjusted toward one side.
(vi) An adjust of limit at least 500g, decipherable and exact up to 0.1 g.
Hypothesis of Aggregate Impact Test :
The property of a material to oppose affect is known as sturdiness. Because of development of vehicles out and about the totals are subjected to affect bringing about their separating into littler pieces.
The totals ought to in this way have adequate durability to oppose their crumbling because of effect. This trademark is estimated by affect esteem test.
The total effect esteem is a measure of protection from sudden effect or stun, which may vary from its protection from step by step connected compressive load.
Method of Aggregate Impact Test:
The test comprises of totals estimated 10.0 mm 12.5 mm. Totals might be dried by warming at 100-110° C for a time of 4 hours and cooled.
(I) Sieve the material through 12.5 mm and 10.0mm IS strainers. The totals going through 12.5mm strainer and held on 10.0mm sifter includes the test material.
(ii) Pour the totals to fill about only 1/3 rd profundity of estimating chamber.
(iii) Compact the material by giving 25 delicate blows with the adjusted end of the packing pole.
(iv) Add two more layers incomparable way, with the goal that barrel is full.
(v) Strike off the surplus totals.
(vi) Determine the net weight of the totals to the closest gram(W).
(vii) Bring the effect machine to rest without wedging or pressing upon the level plate, piece or floor, so it is inflexible and the sledge direct segments are vertical.
(viii) Fix the glass immovably in position on the base of machine and place entire of the test in it and smaller by giving 25 delicate strokes with packing bar.
(ix) Raise the mallet until the point when its lower confront is 380 mm over the surface of total example in the glass and enable it to fall uninhibitedly on the total example. Give 15 such blows at an interim of at least one moment between progressive falls.
(x) Remove the smashed total from the container and strainer it through 2.36 mm IS sifters until the point that no further critical sum goes in one moment. Measure the division passing the sifter to an exactness of 1 gm. Additionally, measure the portion held in the sifter.
Process the total effect esteem. The mean of two perceptions, adjusted to closest entire number is accounted for as the Aggregate Impact Value.
Prescribed Aggregate Impact Test Values:
Grouping of totals utilizing Aggregate Impact Value is as given beneath:
Total Impact Value Classification
<20% Exceptionally Strong
10 – 20% Strong
20-30% Satisfactory for street surfacing
>35% Weak for street surfacing
Indicated points of confinement of percent total effect an incentive for various kinds of street development by Indian Roads Congress is given beneath.
Sl No Type of pavement Aggregate effect esteem not more than
1. Wearing Course 30
a) Bituminous surface dressing
b) Penetration macadam
c) Bituminous cover concrete
d) Cement concrete
2. Bitumen bound macadam base course 35
3. WBM base course with bitumen surfacing 40
4 Cement solid base course 45
Comments
Post a Comment