NZQA registered unit standard
25831 version 2
Page 1 of 3
Title
Describe road construction materials and their compaction
Level
3
Credits
3
Purpose
People credited with this unit standard are able to describe
road construction materials and their compaction.
Classification
Infrastructure Works > Infrastructure Civil Works
Available grade
Achieved
Explanatory notes
The requirements within the following specification documents must be complied with as
appropriate to the context of assessment for this unit standard:
TNZ B/02: 2005, Specification for Construction of Unbound Granular Pavement Layers,
TNZ M/04: 2006, Specification for Basecourse Aggregate; available at
http://www.nzta.govt.nz/resources/results.html.
Outcomes and evidence requirements
Outcome 1
Describe road construction materials.
Range
materials – clay, silt, sand, gravel; natural, manufactured (where applicable).
Evidence requirements
1.1
Materials are described in terms of typical uses in road construction.
1.2
Materials are described in terms of particle size.
1.3
Materials are described in terms of the relationship between water content and
density and suitability for road construction.
Outcome 2
Describe compaction for road construction materials.
Infrastructure ITO
SSB Code101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
25831 version 2
Page 2 of 3
Evidence requirements
2.1
Primary compaction and secondary compaction are described in terms of order
of use and effect on materials.
materials – clay, silt, sand, gravel; natural, manufactured (where
applicable;
primary compaction includes frequency and amplitude.
Range
2.2
Compaction is described in terms of equipment and/or methods used and
situations of use.
Range
2.3
traffic, walk-behind rollers, ride-on rollers, pneumatic tyre rollers,
combination rollers, sheep foot rollers, square foot rollers, dynamic
compaction, soil preloading.
Compaction is described in terms of effects on layer thickness and moisture
content.
Planned review date
31 December 2019
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
19 June 2009
31 December 2016
Review
2
19 February 2015
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.
Infrastructure ITO
SSB Code101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
25831 version 2
Page 3 of 3
Comments on this unit standard
Please contact the Infrastructure ITO qualifications@infrastructureito.org.nz if you wish to
suggest changes to the content of this unit standard.
Infrastructure ITO
SSB Code101813
 New Zealand Qualifications Authority 2016