NZQA registered unit standard
17671 version 3
Page 1 of 4
Title
Design chipseal surfacings using polymer-modified binders
Level
5
Purpose
Credits
5
This unit standard is for people who design chipseals and
surface treatments.
People credited with this unit standard are able to: assess site
requirements for use of polymer-modified binders; describe the
design of polymer-modified chipseals; and design polymermodified chipseals.
Classification
Pavement Surfacing > Chipseal Surfacing
Available grade
Achieved
Entry information
Critical health and
safety prerequisites
Unit 21664, Design chipseal surfacings and pretreatments; and
Unit 17670, Demonstrate knowledge of hot polymer-modified
binders and their use in chipseal construction; or demonstrate
equivalent knowledge and skills.
Explanatory notes
1
The following requirements apply to this unit standard, and must be complied with:
AGPT04F-08 Guide to Pavement Technology Part 4F: Bituminous Binders
(Austroads Guidelines), Austroads, available for purchase at:
https://www.onlinepublications.austroads.com.au/items/AGPT04F-08;
Chipsealing in New Zealand, New Zealand Transport Agency, available at
http://www.nzta.govt.nz/resources/chipsealing-new-zealand-manual/;
The Bitumen Safety Handbook, Roading New Zealand, available for purchase at
http://www.roadingnz.org.nz.
Any requirements superseding any of the above will apply, pending the review of this
unit standard.
2
Assessment against this unit standard may be based on evidence from workplace
and/or provider contexts.
3
Evidence is required of at least four designs.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
4
17671 version 3
Page 2 of 4
Definitions
Company procedures refers to all documented policies, procedures, and
methodologies of the candidate’s employer at the time of training including but not
limited to those relating to health, safety, environment, quality, and operations.
PMB means polymer-modified binder.
Outcomes and evidence requirements
Outcome 1
Assess site requirements for use of polymer-modified binders.
Evidence requirements
1.1
Pavement use and condition are assessed in accordance with Austroads
Guidelines and company procedures.
Range
1.2
traffic stress, texture, cracking, deflections, flushing;
influence of PMB on rate of redevelopment of flushing.
Factors that need to be given special consideration to ensure that polymermodified binder adhesion and cohesion are achieved are assessed in
accordance with site conditions, company procedures, and contract
requirements.
Range
includes but is not limited to – pavement surface cleanliness, chip
cleanliness, climate, shade, moisture, pavement surface
temperature, binder viscosity, cutter use, adhesion agent use.
Outcome 2
Describe the design of polymer-modified chipseals.
Evidence requirements
2.1
Seal selection suitability for site conditions is described.
Range
2.2
Reasons for using different binder types and degrees of modification are
described in accordance with Austroads Guidelines.
Range
2.3
seals – single coat, two coat, multilayer, sandwich, racked-in.
modification includes but is not limited to – diluents, adhesion
agent, hot-sprayed PMB, emulsified PMB;
three reasons.
Reasons for pretreating chip are described.
Range
Infrastructure ITO
SSB Code 101813
cleaning, preheating, precoating.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
17671 version 3
Page 3 of 4
2.4
Tests that confirm properties specified in manufacturer’s technical data sheets
are described.
2.5
The influence of PMB on the rate flushing is described.
Range
polymer type, polymer concentration, bitumen grade.
Outcome 3
Design polymer-modified chipseals.
Range
hot binder, emulsified binder.
Evidence requirements
3.1
Seals are selected in accordance with site conditions.
Range
may include but is not limited to – road geometry, climatic
conditions, traffic loading, and stresses.
3.2
Chip is selected in accordance with site and binder requirements.
3.3
Pretreatments are selected in accordance with site requirements.
Range
pavement surface, chip, texturizing.
3.4
Binder type and degree of modification are determined in accordance with site
requirements.
3.5
Residual binder application rates are determined in accordance with binder
properties, surface texture, chip size, traffic volumes, and surface hardness.
3.6
Field application rates for hot binder are determined in accordance with
spraying temperature and quantity of diluents.
3.7
Chip application rates are determined through the designs in accordance with
chip average least dimension and site requirements.
3.8
Designs are completed in accordance with client requirements and contract
specifications.
Range
Planned review date
Infrastructure ITO
SSB Code 101813
may include but is not limited to – road and traffic noise, loose
chip, type of end user e.g. cyclists, pedestrians.
31 December 2016
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
17671 version 3
Page 4 of 4
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
25 November 2000
31 December 2013
Review
2
27 October 2005
31 December 2013
Review
3
15 March 2012
N/A
Consent and Moderation Requirements (CMR) reference
0101
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
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 (CMR). 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.
Comments on this unit standard
Please contact Infrastructure ITO askus@infratrain.co.nz if you wish to suggest changes to
the content of this unit standard.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016