Test of Aggregate's

TEST of Aggregate's:

In this post we will study the type of test conducted for good aggregate 

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Calculate the properties of Aggergate following test are conducted:

Properties of Aggergate           Test

Crushing Strength -          Crushing Test
Hardness  - Dorry abrasion test               
Rate of Wear - Attriation test
Toughness - Impect test
Durability-  Soundness test
Shape factor - Shape test
Abraison value - Loss Angeles test

watch video Segregation of concrete

Aggregate crusing value (A.C.V.):

To test the crushing value of Aggergate we use a sample of Aggregate which passes through 12.5mm sieve and retained on 10 mm sieve

To test the Aggregate crushing we uses a mould i.e cylinder to fill with Aggregate having dimension of diameter 25mm and height 25mm

After filling mould a total load of 40 tone is applied and then allowed to pass through 2.36mm sieve

A.C.V =( W2/W1)×100

W1 =Total weight of sample

W2 =Weight of sample passing through 2.36 mm sieve

also watch Bleeding of concrete

Conclusion :-

If Aggregate is used for Road Pavement or Bitumen pavement top surface (Bearing surface)

A.C.V. should not more than 30%

If Aggregate is used other than bearing surface Road ,

I.e for the base coarse or concrete of road the A.C.V value should not more than 45%

Aggregate Impact Value Test:

In this test Impact Resistance Capacity is calculated.

Apparatus used for impact resistance

Mould Size 10.2 cm diameter and 5cm height

In this test after filling with Aggregate a 14kg  Hammer is released from 38 cm height ,15 times and after that the  Sample is allowed to pass through 2.36 mm Sieve .

No.'s of blow = 15

A.I.V Value =( W2/W1)×100

Where W1=Total weight of sample

W2=Weight of sample passing through 2.36 mm sieve.

Conclusion:-

If Aggregate is used for Road Pavement or Bitumen pavement top surface (Bearing surface)

A.I.V. should not more than 30%

If Aggregate is used other than bearing surface Road ,

I.e for the base coarse or concrete of road the A.I.V value should not more than 45%

watch Carpet area, super built-up area

 Aggregates Abrasion Value (A.A.V.)

To find Agg. Abrasion Value lose Angeles machine is used ,

In this test after filling mould with

 Aggregate it is rotated  28-33 RPM till 1000revolutions after that Sample is allowed to pass through 1.70mm sieve

A.A.V = (W2/W1)×100

Where W1=Total weight of sample

W2=Weight of sample passing through 1.70 mm sieve.

Conclusion

If Aggregate is used for Road Pavement or Bitumen povement top surface (Bearing surface)

A.A.V. should not more than 30%

If Aggregate is used other than bearing surface Road ,

I.e for the base coarse or concrete of road the A.A.V value should not more than 50%

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