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Concrete Lab Instructions

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Concrete Design And Technology (CVEN90016)

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University of Melbourne

Academic year: 2019/2020

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Concrete Design & Technology (CVEN90016) – Concrete Labs: Instructions (2016)

Making concrete cylinders for compression testing

Mixing procedure:  Mix coarse dry ingredients: aggregate and sand  Add fly ash and Portland cement  Add liquids slowly while mixing: water and superplasticiser  Mix for about 4 minutes and check mix consistency/moisture
Casting the standard sized cylinder moulds (100mm diameter ×200mm height) with the fresh concrete mix:  First oil the cylinders so that concrete does not bond with the mould  Fill half of the cylinders with concrete, and vibrate for a short time (less than 1 minute, stop vibrating once the formation of bubbles stop)  Then completely fill the cylinders and vibrate one more time (stop vibrating once the formation of bubbles stop)
Flatten the top of the cylinders and remove any excess concrete  Make sure you also wipe the moulds
Re-locate the moulds to designated location for curing
Clean up the laboratory space and equipment used

Concrete Mix Details

Expected strength at 28 days: 80-95 MPa kg / m 3 1 Cement 475 2 Fly ash 52 3 Water 108 4 Superplasticiser (SP) 27 litres 5 Sand 720 6 10 mm Aggregate 347 7 20 mm Aggregate 737

For 3 cylinders the mix should be carried out for 10 litres (i. 0 m 3 ) to account for wastage and ensure sufficient mixing of the components based on the mixer size.

Was this document helpful?

Concrete Lab Instructions

Course: Concrete Design And Technology (CVEN90016)

52 Documents

Students shared 52 documents in this course

University: University of Melbourne

Was this document helpful?

Concrete Design & Technology (CVEN90016) – Concrete Labs: Instructions (2016)

Making concrete cylinders for compression testing

1) Mixing procedure:

 Mix coarse dry ingredients: aggregate and sand

 Add fly ash and Portland cement

 Add liquids slowly while mixing: water and superplasticiser

 Mix for about 4 minutes and check mix consistency/moisture

2) Casting the standard sized cylinder moulds (100mm diameter ×200mm height) with the

fresh concrete mix:

 First oil the cylinders so that concrete does not bond with the mould

 Fill half of the cylinders with concrete, and vibrate for a short time (less than 1 minute,

stop vibrating once the formation of bubbles stop)

 Then completely fill the cylinders and vibrate one more time (stop vibrating once the

formation of bubbles stop)

3) Flatten the top of the cylinders and remove any excess concrete

 Make sure you also wipe the moulds

4) Re-locate the moulds to designated location for curing

5) Clean up the laboratory space and equipment used

Concrete Mix Details

Expected strength at 28 days: 80-95 MPa

kg / m3

Cement

475

Fly ash

Water

108

Superplasticiser (SP)

27 litres

Sand

720

10 mm Aggregate

347

20 mm Aggregate

737

For 3 cylinders the mix should be carried out for 10 litres (i.e. 0.01 m3) to account for wastage

and ensure sufficient mixing of the components based on the mixer size.

Concrete Lab Instructions

Concrete Design And Technology (CVEN90016)