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Making Test Cubes

By July 14, 2021July 19th, 2021No Comments

Making Test Cubes

You will need the following equipment –

1. Brush and mould oil

2. Buckets or wheelbarrow

3. Cloth

4. Cube moulds

5. Damp cloth and plastic sheet

6. Rubber Mallet

7. Mixing tray

8. Pen

9. Sampling scoop

10. Sampling/cube/storage certificates

11. Small scoop

12. Spanner

13. Square mouthed shovel

14. Steel float

15. Compacting bar

Lightly re-oil cube moulds with release oil

Step 1

· Check that the Moulds are clean and lightly oiled with bolts       tightened

· Ensure that the correct halves of the mould are used and that the    corner pins are correctly located

Step 2

· Thoroughly remix the sample shovelling into a heap

· Turn the heap over to form another

· Do this three times

· Flatten the final heap by repeatedly digging in the shovel vertically

· Lift the shovel clear each time

Step 3

· Fill the Mould with concrete in 50mm layers

· Using the special Compacting Bar, compact the concrete with no less than   

    25 tamps for each of the two layers in a 100mm Mould

    35 tamps for each of the three layers in a 150mm Mould

For very high workability concrete you may not need the minimum number of tamps

Step 4

· Remove surplus concrete and smooth over with a float

· Wipe clean the Mould edges

· Number the Moulds for identification

Step 5

· Cover each Mould with a damp cloth and plastic sheet

· Store inside at normal room temperature (15 – 25oC)

· Protect the Cube Moulds at all times from high and low

  temperatures (especially frost) and drying winds

· Complete the sampling and cube making certificates