Slump Test Lab

EXPERIMENTAL SET-UP

Different Tests and Equipment

4.1 Slump-flow test

4.2 L-box test

4.3 U-box test

4.4 V-funnel test

4.5 Compressive strength test

4.1 SLUMP FLOW TEST The slump flow is used to assess the horizontal free flow of SCC in the absence of obstructions. It was first developed in Japan for use in assessment of underwater concrete. The test method is based on the method for determine the slump. The diameter of the concrete circle is a measure for the filling ability of the concrete.

4.1.1 Equipment

The apparatus is shown in figure.

• Mould in the shape of a truncated cone with the internal dimensions 200mm diameter at the base, 100mm diameter at the top and a height of 300mm.

• Base plate of stiff non absorbing

NO. 4.2 V-FUNNEL TEST

4.2.2 Procedure For T 0 minute:-

• Took around 12 litres of concrete to perform this test.

• Then we set the V-funnel on firm ground.

• Next, we moisten the inside surface of the funnel.

• Keep the trap door open to allow any surplus water to drain.

• Then we close the trap door and place a bucket underneath.

• Fill the apparatus completely with concrete without compacting or tamping. We just strike off the concrete level with the top with trowel.

• After filling it we open the trap door and allow the concrete to flow out under gravity.

• Start the stopwatch when the trap door is opened and record the time for the discharge to complete.

For T 5 minute:-

• Don’t clean or moisten the inside surface of the funnel again.

• Close the trap door and refill the V-funnel immediately after measuring the flow time.

• Fill the apparatus completely with concrete without tamping, just we strike off the concrete level with the top with the trowel.

• Open the trap door 5 minutes after the second fill of the funnel and allow the concrete to flow out under gravity.

• We simultaneously start the stopwatch when the trap door is opened and record the time for the discharge to complete (the flow time at T 5

The apparatus consists of a rectangular –section box in the shape of ‘L’, with a vertical and horizontal section, separated by a moveable gate, in front of which vertical lengths of reinforcement bar are fitted.

4.3.1 Equipment

The apparatus is shown in figure.

• L -Box of a stiff non absorbing material.

• Trowel, and

• Scoop.

FIG. NO. 4.3 L-BOX TEST SET-UP

4.3.2 Procedure

• Took around 14 litres of concrete to perform this test.

• Set the apparatus in a firm ground and ensure that the sliding gate can open freely and then close it.

• Moisten the inside surface of the apparatus and remove any surplus water.

• Then fill the vertical section of the apparatus with the concrete sample.

• Leave it to start for 1 minute.

• Then lift the sliding gate and allow the concrete to flow out into the horizontal section.

• When the concrete stops flowing, note down the distances “H1” and “H2”.

• Then calculate (H2/H1) which give us the blocking ratio.

4.4 U –Box Test