NZQA registered unit standard
13521 version 4
Page 1 of 3
Title
Demonstrate knowledge of the compaction of hot mix asphalt
Level
3
Purpose
Credits
5
This unit standard is designed for people in the pavement
surfacing industry who require an understanding of the practical
aspects of asphalt compaction such as asphalt paving machine
operators, roller operators, and asphalt construction, and may
include asphalt construction supervisors.
People credited with this unit standard are able to: demonstrate
knowledge of hot mix asphalt compaction equipment and
operational hazards; and describe the effective compaction of
hot mix asphalt.
Classification
Pavement Surfacing > Asphalt Surfacing
Available grade
Achieved
Explanatory notes
1
The following requirements apply to this unit standard, and must be complied with:
New Zealand Transport Agency specifications at http://www.nzta.govt.nz/resources/:
NZTA P9: Specification for Construction of Asphaltic Concrete Paving;
NZTA P9P (Auckland): Specification for Construction of Asphaltic Concrete Paving;
NZTA P11: Specification for Open Graded Porous Asphalt;
NZTA P11 Notes: Notes to the Specification for Open Graded Porous Asphalt.
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
Definition
Job requirements take account of site conditions to meet contract specifications, and
accord with procedures and work instructions written in quality manuals.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
13521 version 4
Page 2 of 3
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of hot mix asphalt compaction equipment and operational
hazards.
Evidence requirements
1.1
Types of equipment used for hot mix asphalt compaction are described in terms
of their function.
Range
1.2
Compaction equipment is described in terms of maintenance requirements
when used with hot mix asphalt.
Range
1.3
paving machine screed, tamper bars;
rollers – static steel, vibrating, rubber-tyred, combination (vibrating
drum and rubber-tyred);
hand compactor, hand-operated plate compactor.
water system, scraper, rollers, tyres, plates, oil, fuel.
Hazards of compaction operations are described in terms of controls.
Range
hazards include but are not limited to – traffic, restricted vision,
reversing, equipment instability, ground instability, vibration,
excessive live loads.
Outcome 2
Describe the effective compaction of hot mix asphalt.
Evidence requirements
2.1
Rolling operations are described in terms of sequence, pattern, and the number
of rollers to maintain required laying rate while achieving compaction, in
accordance with job requirements.
Range
2.2
sequence – breakdown, principal, finish;
number of passes.
Techniques for achieving uniform joints and edges are described.
Range
joints – transverse, longitudinal, hot, cold.
2.3
Techniques for achieving specified shape, density, and uniformity of mat are
described.
2.4
Techniques for avoiding pickup, loss of macro texture, deformation, over-rolling,
and cracking of the mat are described.
2.5
Compaction is described in terms of achieving required strength, permeability,
and life of an asphalt layer.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
2.6
13521 version 4
Page 3 of 3
Compaction is described in terms of factors that influence the result.
factors include but are not limited to – road temperature, ambient
temperature, wind, mat thickness, mat temperature, mix type,
roller type.
Range
Planned review date
31 December 2016
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
24 March 1998
31 December 2013
Revision
2
5 January 1999
31 December 2013
Review
3
27 October 2005
31 December 2013
Review
4
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