NZQA registered unit standard
28689 version 1
Page 1 of 3
Title
Explain mix design fundamentals for bituminous products
Level
4
Credits
6
Purpose
People credited with this unit standard are able to explain mix
design fundamentals for bituminous products.
Classification
Infrastructure Works > Bitumen Product Manufacturing
Available grade
Achieved
Explanatory note
Evidence generated for assessment against this unit standard must be based on the
fundamental principles of mix designs in the following references:
IG8 Asphalt Mix Design, Australian Asphalt Pavement Association, available at
http://www.aapa.asn.au;
MS-2 Mix Design Methods, Asphalt Institute, available for purchase at,
https://asphaltinstitute.org/;
AGPT04B-14 Guide to Pavement Technology Part 4B: Asphalt, Austroads available at
https://www.onlinepublications.austroads.com.au/items/AGPT04B-07;
New Zealand Transport Agency specifications at http://www.nzta.govt.nz/resources/:
NZTA M10: Specification for Dense Graded and Stone Mastic Asphalts;
NZTA M10 Notes: Notes to the Specification for Dense Graded and Stone Mastic
Asphalts;
NZTA P11: Specification for Open Graded Porous Asphalt;
NZTA P11 Notes: Notes to the Specification for Open Graded Porous Asphalt.
Outcomes and evidence requirements
Outcome 1
Explain mix design fundamentals for bituminous products.
Evidence requirements
1.1
The objectives of mix design are explained in terms of making the best use of
available materials to produce a surfacing fit for purpose in line with the contract
or specification.
Range
Infrastructure ITO
SSB Code 101813
design envelope, tolerances, numbers of components, aggregate
sources, representative samples, number of cold feed bins, traffic
criterion, compaction method, design method, binders source.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
1.2
The process of mix design is described in terms of developing laboratory
samples and comparing with product specifications.
Range
1.3
proportions, aggregate types, aggregate shapes, binder content/
bitumen grades, binder types, binder temperature, additives,
source properties, grading curves, air voids, mixing temperatures,
contract requirements, performance tests such as wheel tracking.
Methods of mix design are described in terms their differences and current use.
methods – Marshall, AGPT04B-07, NZTA M/10, NZTA P/11.
Range
1.4
A laboratory mix design recipe is interpreted to develop a recipe for a
bituminous mix manufacturing plant that will ensure the materials are inputted
correctly to achieve product specifications.
correct – quality, proportions, quantity, temperature, flow rate,
materials.
Range
1.5
28689 version 1
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Scale-up trials are described in terms of why they are needed and what is
involved in conducting them.
Range
quantity of trial mix made, sampling and testing requirements,
plant settings, production rate.
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 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 (CMRs). The
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28689 version 1
Page 3 of 3
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 the Infrastructure ITO qualifications@infrastructureito.org.nz if you wish to
suggest changes to the content of this unit standard.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016