Coloured Surfacing

Procalm - A Hot Applied High Friction Anti-Skid System

Description

Procalm is a hot screed applied polymer modified rosin ester material, designed for use with various types and grades of bauxite aggregates. It can be supplied for use in Red or Green coloured surfaces, although others colours are available on request.

Procalm is less weather sensitive than epoxy based systems and can therefore be applied all year round on new or worn surfaces.

It can be readily applied to all asphalt surfaces and can also be used on concrete surfaces after preparation with a suitable primer.

Typical Applications

Procalm is used for applications where a textured durable matrix of 3 - 5mm is required which meets the NRA requirements for skid resistance and texture depth - application such as:

• Village Gateways
• Speed Roundels
• Ghost Islands
• Bus Stops
• Cycle Lanes

Packaging

Procalm is supplied in 25-kg low melt polythene sacks.

Binder

Softening Point: Minimum of 90oC when tested to BS 2000 Pt 58: 1993
Flow Resistance: Maximum of 1% when tested to BS 2499 Pt 3: 1993

Colour

Standard Red or Green with other coloured grades available on request.

Aggregate

Washed and dried graded aggregate with a PSV of 65 and a moisture content of less than 1%. Coloured aggregate incorporated into the material should not be less than 100% of the overall typical aggregate content. The aggregate content of the mix is typically 55%. Table 1 shows the grading information for the mixed aggregate and extender.

Surface Preparation

The surface should be treated using a hot compressed air lance operating at 800oC to remove dust, laitance and foreign matter. Unless otherwise directed, all existing road markings, iron work and road studs should be suitably masked.

Application

Procalm should be loaded into a heater/mixer with positive temperature control and mechanical agitation via horizontal hydraulically driven stirrers. Application temperature is typically 190°C +/- 10°C. The hot material is poured into a screed box with a suitably designed trailing edge and is applied by combing transversely across the surface of the site.

This allows the aggregate to be evenly distributed to provide a well textured (average TD 1.5 +/- 0.1mm), durable skid resistant surface with a minimum Skid Resistance Value (SRV) of 65 when measured by the Portable Skid Resistance Apparatus. On the average TD surface the coverage rate of the material should be 10.5 - 11.15 kg/m² (85 - 95 m²/tonne).

A rougher surface may require a higher rate of spread. After completion, the surface should not be opened to traffic until it has reached the temperature of the adjacent road surface, typically 20 minutes.

Table 1 Aggregate Grading