Slurry Seals / Microasphalt
Slurry seals are cold mixed materials based on bitumen emulsion, crushed rock aggregate, cement, water and a break-control additive. They can be either hand or machine mixed. Machine mixing can be either by batch or continuous mixing.
Thin 0/3mm and 0/6mm seals, made with standard bitumen emulsions, are single-pass treatments used to seal low speed roads. Thicker 0/6, 0/10mm or 0/12mm seals, termed "microasphalt", are mixed with emulsion made with polymer modified bitumen. Often laid in two passes, they are used to re-profile worn or rutted roads. Other seals with special properties, such as fuel resistance, are also available.
Maxseal®
Maxseal is the choice of the discerning highway engineer looking for a convenient and economic treatment for sealing and restoring texture to deteriorating surfaces. Maxseal systems are available for footway, carriageway and airfield pavements.
Maxseal is a very rapid single-pass treatment which seals the treated surface against further deterioration and improves both skid resistance and visual appearance. Maxseal's rapidity of application and curing, to form a dense impermeable layer, minimises disruption and inconvenience to road users. Time to trafficking is typically minutes to one hour. No rolling is required. Raising of ironwork is not normally required. Maxseal is most suitable for use in urban residential areas and car parks. Grades suitable for footpath sealingare also available.
For airfield surfacing, two systems based on fine or coarse graded aggregate are available. In 2003, Northstone laid 320,000 m2 of coarse texture slurry seal on runways and taxiways at Mount Pleasant Airfield on the Falkland Islands, aptly demonstrating the Company's resources and operational capacity.
Technical Information:
Emulsion – Cationic K3-60
Aggregate – High quality, high PSV (60-65) greywacke
0/1.5mm, 0/3mm, 0/6mm grades available
Filler – Ordinary Portland Cement
Binder content – 8-13% by weight depending on aggregate grade
Coverage – 0/1.5mm, 2-4kg/m2; 0/3mm, 4-6kg/m2; 0/6mm, 5-9kg/m2
Maxseal is laid in a single pass
Time to trafficking – Typically 30 minutes to one hour, no rolling required unless specified
Areas of use – Airfields, urban residential roads and car parks
Maxpave®
Maxpave is a polymer modified microasphalt which offers the highway engineer a quick and cost effective maintenance treatment of surfaces which have rutted or lost their skid resistance under today's heavy traffic volumes.
A Maxpave overlay provides a strong durable carpet with a textured surface and good skid resistance. Cold mixed and laid on site, using a highly specialised purpose-built machine, the ease and rapidity with which Maxpave can be laid and cures (typically 10-15 minutes to trafficking) causes minimal traffic disruption and inconvenience to road users. Maxpave has successfully been used on heavily trafficked roads, busy urban routes, roundabouts, and on both rural and residential roads. Maxpave is available in grades suitable for resurfacing footpaths.
Technical Information:
Emulsion – Cationic SBS polymer modified K3-65
Aggregate – High quality, high PSV (60-65) greywacke
0/6mm, 0/10mm, 0/12mm grades available
Filler – Ordinary Portland Cement
Marshall stability – 5-7 KN
Flow value – 2-3mm
Binder content – 5-9% by weight depending on aggregate grade
Coverage – Up to 25kg/m2 approx.
Maxpave is typically laid in two passes – a regulating layer followed by a surface course layer. Ruts up to 50mm deep can be filled. Potholes up to 100mm deep can be pre-filled prior to laying
Time to trafficking – Typically 10-15 minutes, no rolling required
Areas of use – Heavily trafficked roads, busy urban routes, roundabouts, rural roads and
residential roads
Promak® fuel resistant slurry
Promak is a special polymer modified coal tar-pitch emulsion with unique fuel resistant properties. Specially developed by TIB Chemie in Mannheim, Germany, for the surface treatment of airfield pavements, runways and taxiways, Promak can also be used to surface car parks, bus stations and fuel storage bund areas, wherever fuel spillage poses a problem.
Promak Slurry Seal surfacing is:
- Resistant to aviation fuel and kerosene (paraffin).
- Resistant to de-icing fluids such as urea.
- Impermeable to most liquids.
- Flexible.
- Hard wearing and highly skid resistant.
- Able to withstand temperature of 100°C for a minimum of one minute
- Resistant to freeze-thaw cycles.
- Weather resistant, it protects the substrate.
Technical Information:
Emulsion – Promak polymer modified coal tar-pitch emulsion.
Aggregate – High quality, high PSV (60-65) Criggion Basalt 0/2mm airfield blend.
Binder content 14-16% by weight.
Coverage – 2-4kg/m2.
Areas of use – Airfield runways, taxiways and aircraft hard standing areas, fuel storage bund areas, bus bays and heavy vehicle parking areas, garage forecourts – any blacktop area where there may be fuel or oil spillages.
Preparation / priming:
- Old asphalt and concrete surfaces must be primed with a specially formulated Promak solvent primer to promote adhesion.
- New surfaces are primed with a mixture of Promak emulsion diluted with water and applied by broom or spraying.
Product safety information is available on request.
Promak is a registered trade mark of Goldschmidt TIB GmbH (formerly TIB Chemie), Germany.
