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Ardex A18 is a bonding cement for producing bonding slurries for application over concrete and cement/sand screeds, suitable for internal and external use, including swimming pools. Changes colour as it dries, indicating if it remains open to receive the Ardex Screed Cement.
- Can also be used for joining daywork joints when a new bay is laid against a set and hardened screed, including screeds with underfloor heating systems.
- Produces a slurry ideal for bonding Ardex Screed Cements
- High adhesion strength maximises the bond between the screed and the substrate
- Colour change reduces the risk of the application of screeds in to dry bonding slurries
- 60 minute pot life
- 15 minute open time
Ardex A 18 is a green powder with aggregates and specially formulated additives which, when mixed with water, produces a slurry ideal for bonding Ardex Screed Cements.
The bonding slurry changes colour as it dries, indicating if it remains open to receive the Ardex Screed Cement.
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Pack Contents
Packed in paper sacks incorporating a polyethylene liner - net weight 25kg.
Surface Preparation
The substrate may be dry or damp (with no surface water) but must be rigid, clean and free of dust, grease and other barriers to adhesion. The use of Ardex DGR Degreaser is recommended for the removal of oils, waxes and any other barriers to adhesion, from the substrate.
Concrete surfaces must be prepared using suitable mechanised equipment to expose the coarse aggregate and to remove all barriers to adhesion. All surface coatings must be removed prior to application.
Mixing
Add the Ardex A 18 powder to clean water in a clean container, whilst stirring and mixing thoroughly to give a smooth, lump-free paste. The use of an Ardex mixing paddle with a 10mm chuck variable speed electric drill makes light work of mixing.
The mixing proportions by volume are:
- 3 parts Ardex A 18 powder to 1 part water.
A 25kg bag of Ardex A 18 powder requires approximately 5.75 litres of water.
The mixed Ardex A 18 slurry has a working time of approximately 60 minutes. Once the mortar starts to stiffen/set, do not add additional water to the mix.
Application
Apply Ardex A 18 to the substrate with a brush to a minimum thickness of 1.5mm.
The screed cement must then be placed and compacted ‘fresh in fresh’ whilst the bonding slurry is still wet and workable; this is indicated by a dark green colour. After approximately 15 minutes the colour changes to light green, indicating the slurry has dried and an additional application will be required.
Apply Ardex A 18 at temperatures above 5°C.
Note: Screeds should be applied in accordance with BS 8204: Part 1 or BS 5385: Part 3.
Data sheet
- For Use By
- Professional Use
- Interior / Exterior Use
- Interior Use
- Single, Two or Three Pack
- Single
- Coverage
- 1.5kg of powder per m² per mm application thickness
- Tensile Strength
- After 1 day: approx. 2 N/mm²
After 7 days: approx. 3 N/mm²
After 28 days: approx. 7 N/mm² - Min. Application Temperature
- 5°C
- Compressive Strength
- After 1 day: approx. 8 N/mm²
After 7 days: approx. 13 N/mm²
After 28 days: approx. 26 N/mm² - Base Type
- Cement
- Working Time
- 60 minutes
- Suitable For Use On
- Concrete Floor Screeds
- Suitable For Use On
- Sand and Cement Floors
- Application Method
- Tamper
- Usages
- Underfloor Heating
- Usages
- Colour-Changing
Questions
Question about the product
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IMPORTANT SHIPPING & DELIVERY INFORMATION
Ardex A18 Screed Bonding Cement with Colour Indicator is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.
Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.
Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.
All delivery costs below are excluding VAT