Method of Test For Bleeding of Concrete

Method of Test For Bleeding of Concrete

This test determines the relative quantity of mixing water that will bleed from a sample of freshly mixed concrete.

Apparatus

The apparatus used to conduct the bleeding test of concrete are:

1. A cylindrical container having inside diameter of 250mm, inside height of 280mm and capacity of 0.01m³(approximately).

2. A tamping rod made of steel of 16mm in diameter and 600mm long.

3. A pipette.

4. A graduated jar of 100cm³ capacity.

Procedure

Following are the procedure for bleeding test of concrete:  

A sample of freshly mixed concrete is obtained. The concrete is filled in the cylindrical container in equal five layers and each layer is tamped by tamping rod. The top surface is made smooth by trowelling.  

The test specimen is weighted and the weight of the concrete is noted. Knowing the total water content in 1m³ concrete. the quantity of water in the concrete in the cylindrical container is calculated.  

The cylindrical container is kept in a level surface free from vibration at a temperature of 27℃ ± 2℃. Water accumulated at the top is collected by pipette at regular interval till bleeding ceases. All the bleeding water is stored in a measuring jar. Then

Bleeding Water Percentage = (Total quantity of bleeding water/Total quantity of water in the sample of concrete)×100%

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