NZQA registered unit standard
Title
22293 version2
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Demonstrate knowledge of pavement stabilisation for road works
Level
Purpose
4 Credits 8
People credited with this unit standard are able to explain reasons for and effects of soil stabilisation, and describe methods of soil stabilisation.
Classification
Available grade
Infrastructure Works> Generic Road Works
Achieved
Explanatory notes
1 The requirements within the following guideline applying to civil construction operations must be complied with as appropriate to the context of assessment for this unit standard: TNZ M/15: Lime for use in Soil Stabilisation , Transit New Zealand,
1986. A full listing of New Zealand Transport Agency's principal external manuals, manual amendments and technical documents is available at http://www.nzta.govt.nz/resources/
2 Assessment against this unit standard may take place in a workplace and/or provider environment.
Assessment parameters will depend on company and site specific equipment, procedures, and practices. Practices must reflect industry best practice and comply with legislative requirements.
3 Definitions
Company requirements include the policy, procedures, and methodologies of the company. They include legislative and regulatory requirements applicable to the company or a specific site. Requirements are documented in the company ’s health and safety plans, traffic management plans, contract work programmes, quality assurance programmes, policies, and procedural documents.
Pavement includes layers from subgrade to finished surface.
Outcome 1
Explain reasons for and effects of soil stabilisation.
Evidence requirements
Infrastructure ITO
SSB Code 101813

New Zealand Qualifications Authority 2020

NZQA registered unit standard
1.1
22293 version2
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Explanation identifies reasons for using stabilising materials in terms of pavement layer improvement.
Range subgrade, sub-base, base course.
1.2 Explanation identifies reasons for choice of stabilising materials in terms of soil type.
Range moisture, plasticity, cementation.
1.3
1.4
Explanation outlines economic reasons for the stabilising of materials.
Explanation outlines tests for the bearing capacity of soils and traffic load on pavements.
Range may include but is not limited to – unconfined compressive test,
California Bearing Ratio (CBR), soaked CBR, Clegg hammer,
Benkelman beam.
1.5 Explanation of stabilising road pavements outlines the strengthening required for each layer and the need for preconditioning.
1.6 Explanation identifies climatic and temperature effects on stabilising materials.
Outcome 2
Describe methods of soil stabilisation.
Range stabilisation materials include but are not limited to – cement, lime, foam bitumen.
Evidence requirements
2.1 Description of mix-in-place method identifies equipment and materials and outlines process in accordance with company requirements.
Range includes but is not limited to
– preshaping, preconditioning, spreading of stabilisation material, hydration, mixing, compaction, shaping, curing.
2.2 Description of pre-mix method identifies equipment and materials and outlines process and placement in accordance with company requirements.
2.3 Description outlines procedures for construction of joints in accordance with company requirements.
Replacement information This unit standard replaced unit standard 17323.
Infrastructure ITO
SSB Code 101813

New Zealand Qualifications Authority 2020

NZQA registered unit standard 22293 version2
Page 3 of 3
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 25 September 2006 31 December 2016
Review 2 19 February 2015
Consent and Moderation Requirements (CMR) reference
N/A
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 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 2020