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Sikacrete®-733 3D

One-part micro-concrete with longer open time for 3D printing

Sikacrete®-733 3D is a 1-part, fibre containing, micro-concrete, with longer interlayer open time and reduced CO2 footprint for use with 3D concrete printing robot or gantry printers.

  • Contains supplementary cementitious material, to reduce the carbon footprint
  • Longer open time, for extended interlayer bonding period
  • Fast hardening development after setting, for stacking and building up layers
  • Contains fibres, to control plastic shrinkage cracks
  • Fast absorbing, suitable for continuous and static mixers
  • Easy to use, just mix with water
  • Adjustable consistency, for temperature variations
  • Thixotropic consistency, to maintain shape after extrusion
  • Lowers viscosity, for lower pumping pressure
  • Low shrinkage, to reduce potential for cracking
  • Optimised grading, for smooth appearance
  • Reduced dust emissions
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Usage

Sikacrete®-733 3D is used for precision concrete printing of 3D objects and components for:
  • Buildings
  • Civil engineering structures
  • Moulds and forms
  • Art, craft and visual displays
  • The Product is suitable for interior or exterior use.
 

Advantages

  • Contains supplementary cementitious material, to reduce the carbon footprint
  • Longer open time, for extended interlayer bonding period
  • Fast hardening development after setting, for stacking and building up layers
  • Contains fibres, to control plastic shrinkage cracks
  • Fast absorbing, suitable for continuous and static mixers
  • Easy to use, just mix with water
  • Adjustable consistency, for temperature variations
  • Thixotropic consistency, to maintain shape after extrusion
  • Lowers viscosity, for lower pumping pressure
  • Low shrinkage, to reduce potential for cracking
  • Optimised grading, for smooth appearance
  • Reduced dust emissions

Packaging

25 kg bag

1000 kg bag

Refer to the current price list for available packaging variations.

Colour

Grey powder

Product Details

Product Information

Composition

Portland cement and supplementary cementitious material, selected fillers and aggregates, micro-fibres and special additives

Shelf life

9 months minimum from date of production

Storage conditions

The Product must be stored in original, unopened and undamaged sealed packaging in dry conditions.  For consistent printing quality it is recommended to store the material at temperatures between +10 °C and +25 °C. Always refer to packaging

Refer to the current Safety Data Sheet for information on safe handling and storage.

Maximum grain size

~3 mm

Density

2200 kg/l
Technical Information

Compressive strength

Conditioned 24 hours at +23 °C

10 MPa

Conditioned 28 days at +23 °C

35 MPa

Tested with a water addition of 14.0 %.

Modulus of elasticity in compression

Cured 28 days at +20 °C

30 GPa

Flexural-strength

Conditioned 24 hours at +20 °C

3.0 MPa

Conditioned 28 days at +20 °C

6.0 MPa

Tested with a water addition of 14.0 %.

Application

Application Information

Layer thickness

6–40 mm

Layer thicknesses are subject to the equipment and printing procedure and it is recommended to make a test to check suitability

Material temperature

Minimum

+10 °C

Maximum

+25 °C

The material and water temperature plays a significant role in the printing process.  Having a constant, or reducing significant variations during application will help maintain a consistent quality of printing.

Ambient air temperature

Minimum

+5 °C

Maximum

+30 °C

Mixing ratio

13–14 % water (by weight of powder)

Pot Life

+10 °C

~80 minutes

+20 °C

~60 minutes

+30 °C

~40 minutes

Pot life is based on the temperature of the material after extrusion and indicates when the material is starting to stiffen.  Agitating the material during this time will prolong the pot life.

Initial set time

+ 5 °C

165 minutes

+20 °C

90 minutes

+30 °C

70 minutes

Final set time

+ 5 °C

285 minutes

+20 °C

120 minutes

+30 °C

95 minutes

 
Consumption

Yield

~14.7 litres per 25 kg.

This figure is theoretical and does not allow for any lost material during the mixing or pumping process
Application steps

MIXING

STATIC MIXERS

Preconditions

Use a suitable forced action pan mixer for cementitious materials capable of mixing more than a single 25 kg bag per mix.

  1. Add the recommended amount of clean water with the powder and mix.
  2. Check the corners of the mixer for no dry powder.
  3. Mix for a minimum of 2 minutes until the material is homogeneously mixed.
  4. Place the material into the pumping equipment.

CONTINUOUS MIXERS

  1. Determine the required printing consistency by adjusting the water addition on the equipment as a flow rate in L/h.
  2. Check the water content using the pan test heating method or microwave technique (according to Austrian Standard).

A typical printing consistency is approximately 140 mm in a spread-flow test according to EN 13395-1.

The vertical print speed must be < 1.2 cm/min.

Printing height

Minimum layer circle time (at 20 ºC with 13.5% water)

0.5 cm

25 seconds

1.0 cm

50 seconds

2.0 cm

1 minute 40 seconds

 

The given minimum circle times is a guide and will need adjusting according to the material and ambient temperature, humidity, and actual water dosage. As a guide, extend the times at low temperatures and low humidity. To be determined on site.

Printing at angles depends on several factors including temperatures and mixing ratio. Do not print Sikacrete®-733 3D for designs with an offset centre of gravity due to the long open time of the material.

For further assistance contact your local Sika Technical Services Department.

APPLICATION

3D concrete printing is a manufacturing process using mixing, pumping and robotic placement to apply the printed concrete. All these factors play a significant role in achieving optimal results of the finished concrete component and therefore pre-trials and tests must be carried out before final manufacturing of the finished components.

  • Use SikaPump® Start-1 to prime pump lines.

  • In the event of blockages, rinse equipment and pump lines immediately with clean water

  • Continuously monitor the pot life of the mixed material.

  • Do not allow mixed material to stand in warm temperatures.

  • Keep pump lines wetted and cool.

  • Use warm water at low temperatures and cold water at high temperatures to maintain application performance.

  • For operational maintenance, refer to the equipment instructions.

CURING TREATMENT

Discolouration of printed objects

Note: Condensation due to certain curing methods and curing agents may cause some discolouration to the surface appearance.

  1. Carry out pre-trials with the chosen curing method or agent.
  1. Cure the Product in the prescribed ambient conditions with a minimum of 40 % relative humidity to prevent too early drying of printed objects.
  2. Do not cure newly printed objects outside in the direct sun or windy conditions.

The standard rules of good concreting practice, concerning production and placing must be followed.

CLEANING OF EQUIPMENT

Clean all tools and application equipment with water immediately after use. Hardened material can only be removed mechanically.

 

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