fresh concrete tests

Fresh Concrete Quality Tests

American Concrete Institute(ACI)

Presented by - Abdul Fattah Barakzai

Required Tests:

Slump Test ASTM C 143

Temperature ASTM C 106

Air Content ASTM C 173

Compressive Strength ASTM C 31

Slump Test:

a. Definition:

Slump test is used to measure the consistency

and workability of fresh concrete.

b. Equipment:Slump Cone

Base Plate

Steel Rod

Scoop

Funnel

Brush

C. Procedure:Fill the slum cone in three layers

Give 25 blows to each layers

Level the top surface

Remove the slump cone vertically within

3 – 5 sec

Measure the collapsed height in mm from top

C. Procedure:

Temperature Test:

a. Definition:

Temperature test is required to determine the

temperature of fresh concrete at site.

b. Equipment:Thermometers (Manual or Digital)

Accuracy ± 0.5C°

C. Procedure:Penetrate the thermometer in fresh concrete

sample at least 75mm.

Leave the thermometer for 2 minutes in fresh

concrete

Take reading with accuracy of 0.5 C°

C. Procedure:

Air Content Test:

a. Definition:

Air content test is required to determine the

percentage of air content in fresh concrete.

b. Equipment:Air meter

Flask

16mm Rod

Straightedge

Water Bowel

C. Procedure:Fill the air meter bowel in three layers from

fresh concrete

Give 25 blows to each layers

Level the top surface

Put the cover and adjust the air gage to zero

Fill the empty space with water

Open the valve of air meter and measure the

air content

C. Procedure:

Compressive Strength Test:

a. Definition:

This test is required to determine the

compressive strength of fresh concrete

while hardened after 7, 28 and 90 days.

b. Equipment:Cylinders

16mm Rod

Straightedge

Scoop

Funnel

Base Plate

C. Procedure:Lubricate the inner side of cylinder with oil

Fill the cylinders in three layers from fresh

concrete

Give 25 blows to each layers

Level the top surface

Cover the surface with vapour barrier

Remove vapour barrier after 24 hrs and put the

cylinders in moisture room

C. Procedure:

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