Different Tests on Aggregate. |AIV|ACV|FLAKINESS|ELONGATION|LAAT

1)AIV test 

Apparatus Required:

a) AIV machine

     •Base Plate

     •Cylindrical steel cup of depth 50mm and dia 102mm.

     •Metal hammer of weight 13.5kg to 14kg, length 50mm and dia 100mm

     •Height 380mm

b) Sieves 

    -12.5mm, 10mm and 2.36mm

c) Cylindrical Measure of 75mm dia and 50mm depth

d) Tamping Rod 

e) Weighing Balance 

f) Microwave Oven

Procedure:

-Take a sample of aggregate passing through 12.5mm sieve and retaining on 10mm sieve.

- Dry the sample in the oven for 4 hr at temperature 100 to 110°C.

-Fill the cylindrical measure in 3 layers of aggregate. Each layer is tamped 25 times using a tamping rod. level the top surface of aggregate.

-Measure the sample . (Wt. of measure + Wt. of sample= W1)

-Measure the Wt. of measure . (W2)

-Calculate Wt. of sample. (W1-W2)

-Transfer the sample to steel cup and tamp it by 25 blows.

-The impact hammer is released and raised and impact is given to the sample for 15 times .

-Then the sample is sieved using 2.36mm sieve. Then the Wt. of sample passed through the sieve is measured. ( W3)

Calculation:

Aggregate Impact Value = 

`W_3/(W_1-W_2) times100`

Observation Sheet for AIV Test

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2) ACV Test

Apparatus Required:

a) 15cm dia open-ended cylinder (Testing Mould). 

b) 45cm long tamping rod with 16mm dia.

c) Measuring Cylinder (11.5mm dia, 18mm long)

d) Sieves (12.5mm, 10mm, 2.36mm)

e) Weighing Balance 

f) Compression Testing Machine (CSTM) 

Procedure:

-Take a sample of aggregate passing through sieve of 12.5mm and retaining on 10mm sieve.

-Dry the sample in oven at 100 to 110°C.

-Fill the measuring cylinder by the sample in 3 layers. Each layer is tamped 25 times using a tamping rod. Level the top surface of aggregate.

-Measure the sample . (Wt. of measure + Wt. of sample= W1)

-Measure the Wt. of measure . (W2)

-Calculate Wt. of sample. (W1-W2)

-Transfer the sample into the testing mould and tamp it by 25 blows.

-The plunger is placed and the setup is done in the compression testing machine.

-The load is applied uniformly such that the total load reaches 40 tons in 10 minutes.

-Then the sample is sieved using 2.36mm sieve. Then the Wt. of sample passed through the sieve is measured. (W3)

Aggregate Crushing Value

`e = W_3/(W_1-W_2) times100`

Observation Sheet for ACV Test

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3) Flakiness Index Test.

Apparatus required: 

a) Flakiness gauge.

b) Sieves (20mm, 16mm, 12.5mm, 10mm, 6.3mm).

c) Balance.

Procedure:

- Take 1kg sample of aggregate.

- Arrange the sieve in ascending order from down to top. Place pan at the buttom.

- Place the aggregate sample at the top sieve.

- Shake the sieve thoroughly.

- Check the flakiness corresponding to the aggregate retained in the sieve size.

- The wt. of sample passing through each slot of the gauge is measured and noted .

Flakiness Index Calculation 

` (Total\ wt. ret a i n e d\ on\ various\ thickn ess\ slots)/(1000) times 100`

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4) Elongation test

Apparatus required:

a) Elongation gauge.

b) Sieves (20mm, 16mm, 12.5mm, 10mm, 6.3mm).

c) Weighing Balance.

Procedure:

- Take 1kg sample of aggregate.

- Arrange the sieve in ascending order from down to top. Place the pan at the bottom.

- Place the aggregate sample at the top sieve.

- Shake the sieve thoroughly.

- Check the elongation corresponding to the aggregate retained in the sieve size.

- The wt. of sample retained through each slot of the gauge is measured and noted .

Elongation Index Calculation :

` (Total\ wt. ret a i n e d\ on\ various\ l eng th\ slots)/(1000)  times 100`

Flakiness and Elongation Test Sheet

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5) Sieve Analysis 

Apparatus Required 

•IS Seives (20mm, 12.5mm, 10mm, 4.75mm)

•Mechanical Sieve Shaker 

•Pan

•Tray

Procedure 

•First of all, take the sample of coarse aggregate weighing 1000gms. Let's take 20mm down coarse aggregate.

•Now, place the sample in the set of arranged sieves.

•Now shake the stack of sieve perfectly so that each particle get sufficient chance to pass through the sieve arrangement.

•After shaking, measure and note the weight of aggregates retained on each sieve.

•Now, fill the IS Sieve Report given below.

Sieve Analysis Observation Sheet 

Permissible Values for Sieve Analysis of Coarse Aggregate.

Permissible Values for Sieve Analysis of Coarse Aggregate.

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6) Los Angeles Abrasion Value Test

Apparatus Required 

•Los Angeles Abrasion Machine 

•Abrasive Charge (weighing 390 to 445 gms)

• Weighing Balance 

• Seives (Size of Seives depends upon the grades of aggregate which is given in the report below.)

Procedure 

•First of all, dry the aggregate in an oven at temperature 105°C to 110°C for 4 hrs. After drying, remove the aggregate from oven and allow it to cool at room temperature.

•Measure the weight of sample aggregate. The required weight for specific grade sample is given in report.

• Now, place the aggregate sample along with abrasive charge inside the LAA Machine and fix the cover of machine. The number of abrasive charge depend upon the grades of aggregate as given in report below.

•Ensuring that the conter (reading) is zero, switch on the machine and allow it to run at 30 rev/min. Provide 500 revolution for grades A,B,C & D and 1000 revolution for grades E,F & G.

•Remove the crushed aggregate from the  cylinder and sieve it through 1.7mm sieve.

•Weigh the fraction material passing through  1.7mm sieve. Also weigh the aggregate retained on 1.7mm sieve for counter check.

•Now calculate the LAA Value using the below formula,

`= (Weight\ of\ f ra ction\ passi ng\ 1.7mm\ sieve)/(Wt\ of\ Total\ Material)`

Los Angeles Abrasion Test Observation Sheet 

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