vdw850 Epoxy Paving Joint Mortar (Self-Compacting)
For natural stone, reconstituted stone and concrete block paved surfaces on driveways, roads and other trafficked paved areas, including those used by delivery vehicles etc.
• Fast, durable, cost-effective
• Easily flow applied
• Low temperature application
• Can be applied in the rain
• Clean, stain free surfaces
• Optimum strength correlation
• Street sweeper resistant
• Excellent abrasion resistance
• Frost and de-icing salt resistant
• No weeds or boring insects
• Environmentally friendly
• Power washing safe
• Also ideal for paving refurbishment
Site requirements: A stable, load-bearing structure, a water permeable sub-base and the paving layer must all be correctly designed and installed for the anticipated traffic loads and in accordance with the requirements of BS 7533. vdw 850 is a paving joint mortar and cannot be used to compensate for any settlementof the substructure, or for the sealing and waterproofing of any surface. It is not normally used on larger format paving slabs as it is relatively fast curing. Movement joints must be installed as necessary to comply with the required structural design and any anticipated levels of movement. The vdw 850 mortar can be applied on damp / wet paving and in high humidity and – even in the rain.
In pedestrian areas: In these areas it is acceptable to lay the paving on a compacted and stable, permeable sand or gravel bed. However, it is always better and more durable to lay paving in a permeable concrete or mortar bed, otherwise increased cracking may occur. The paving should be laid as directed by the manufacturer or as stated in BS 7533.
In areas of vehicular traffic: To prevent increased crack
formation in the joints, the paving should be laid on a permeable concrete or mortar bed in accordance with the relevant traffic loads and BS 7533.
Application conditions: The ambient and substrate temperatures should be min. 37,4 °F to max. 77 °F. The vdw850 material temperature should be min. 37,4 °F to max. 68 °F.
Tools: A compulsory forced action mixer or a drill with suitable mixing paddle(s) for smaller projects. Water supply,a hose with spray nozzle, a squeegee and a coconut fibre brush. Uncured mortar can be cleaned from the tools with water.
Test area: On some reconstituted or sensitive natural stone paving, the vdw 850 binder contact can make the stone appear darker or to have a ‘wet look’. These effects are not defects in the product or shortcomings in the execution of the work. Therefore always apply a test area first!
Preparation: Clean the surface of all dirt, cement residues, organic materials, or any other contaminants, including cleaning out all of the joints to the required depth.
Pre-wetting: Fully saturate the paved surface before starting the application and ensure this condition is maintained throughout the work. The amount of wetting required is related directly to the type and porosity of paving and the site conditions i.e. wind, direct sunlight and temperature etc.
Mixing: Pre-mix the vdw 850 resin coated aggregate (component A) materials in the bucket. Then add all of the vdw 850 liquid hardener (component B) in the bottle included in the bucket and mix until smooth and a fully homogeneous consistency.Mixing time: min. 3 – 5 minutes. No water should be added to the material during mixing. Any unmixed components must not be used!
Filling the joints: Instantly spread the mortar across the paved and wetted surface using a rubber squeegee and work thoroughly into the joints, where it self-compacts. We recommend filling the joints from the highest to the lowest points.
Brushing off: Remove any excess vdw 850 mortar after approx. 5 minutes or immediately at temperatures higher than 59 °F, then rinse by spraying lightly with water from a hose at a distance of about 10 inches. Avoid washing material out of the joints. Be careful to clean the paved surface towards areas not yet jointed and do not allow any water containing residues to pond, stand, dry-out or run-off over completed areas. Finally remove any remaining fine residues, again with a damp coconut fibre brush – do not brush any residual dry material into any unfilled joints. Clean this brush in water frequently. Do not brush any dry mortar residue into unfilled joints. Chamfered edges must be brushed free! Cured mortar can only be removed mechanically from the surface. All times and timings relate to a temperature of 68 °F and 65 % relative humidity. Higher temperatures will reduce, whilst lower temperatures will increase them.
Cordon off the freshly applied areas for a period of at least 24 hours or until the paving surface is no longer tacky. Then the areas can be walked over. The area can be fully opened to vehicular traffic after 3 – 5 days, when fully hardened.In general, a strength test should be carried out before final opening of the area. A very thin film of the resin binder can remain on rough surfaces, or any surfaces that are not thoroughly cleaned. This will disappear after a period of exposure to traffic and weathering. To reduce these effects, please use vdw 950 Stone Protect Plus 3 in 1 as a pre-treatment of the paving.
Consumption: The consumptions stated in the table below refer to areas of natural stone setts with cropped edges and have been compiled from our experience. There is no allowance for any loss or wastage, etc. The natural shape of setts and different paving designs may result in variations to these values. If in doubt, determine actual consumption based on a test area.
Natural (light sand)
Basalt (Dark Gray)