28697 Demonstrate Knowledge of Binder Spraying Fundamentals

Explanatory notes

1The following reference material is relevant to this unit standard:

Chipsealing in New Zealand, New Zealand Transport Agency, available at

2Definition

OGPA means open graded porous asphalt.

PMB means polymer modified binder.

Outcomes and evidence requirements

Outcome 1

Demonstrate knowledge of binder spraying fundamentals.

Evidence requirements

1.1Spraying is described in terms of how binders respond to different types of surface.

Rangegranular base, stabilisedbase, chip seal, asphalt, slurry, cold mix, gap graded asphalts, OGPA, concrete.

1.2Spraying is described in terms of binder qualities for different seal treatments.

Rangeseal treatments – first coat, second coat, reseal, membrane, tack coat.

1.3Spraying is described in terms of binder qualities for different seal types.

Rangesingle, two coat, racked in, sandwich, void, texturising, enrichment, rejuvenation.

1.4Binder spraying is described in terms of effects of factors onresidual application rates.

Rangefactors – seal design, road layout, gradient, shade, traffic, size of chip, texture of existing surface, litres of bitumen @15°C, adjustment to application rate for PMB.

1.5Hot application rates are described in terms ofadjusting properties of binder to achieve residual application requirements.

Rangeproperties – binder content, diluent content including adhesion agent, parts per hundred, expansion factors;

evidence is required of application rates for – emulsion, cutback, PMB.

1.6Binder spraying is explained in terms of selecting appropriate binders for different seal types and matching them with the surface and its required treatment.

Rangeexamples of seal types – single, two coat, racked in, sandwich, void, texturising, enrichment, rejuvenation;

surfaces – granular base, stabilised base, chip seal, asphalt, slurry, cold mix, gap graded asphalts, OGPA, concrete;

seal treatments – first coat, second coat, reseal, membrane, tack coat;

binders must be selected for each surface,for each seal treatment,and for at least six seal types in any combination.

Status information and last date for assessment for superseded versions

This CMR can be accessed at

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Requirements for consent to assess and an outline of the moderation system that applies to this standard are outlined in the Consent and Moderation Requirements (CMRs). The CMR also includes useful information about special requirements for organisations wishing to develop education and training programmes, such as minimum qualifications for tutors and assessors, and special resource requirements.

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