NZQA registered unit standard
Title
28690 version 1
Page 1 of 5
Manufacture surfacing products at a bituminous mix plant
Level
Purpose
4 Credits 22
People credited with this unit standard are able to: prepare for production at a bituminous mix plant; operate a bituminous mix plant to produce surfacing products; and manage environmental protection and plant maintenance at a bituminous mix plant.
Classification Infrastructure Works > Bitumen Product Manufacturing
Available grade Achieved
Explanatory notes
1 The following codes of practice, standards, and specifications apply to this unit standard and must be complied with:
RNZ 9803, Quality Assurance for Bituminous Binders: A Code of Practice developed by Roading New Zealand, RNZ 9803:2013, Roading New Zealand, available at http://www.roadingnz.org.nz/sites/roadingnz.org.nz/files/RNZ9803_0513_Final.pdf
NZS 4407:1991 Complete set: Methods of sampling and testing road aggregates ,
Standards New Zealand, at http://www.standards.co.nz
;
New Zealand Transport Agency specifications at http://www.nzta.govt.nz/resources/ :
NZTA M1: Specification for Roading Bitumens ;
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 ;
NZTA P23: Performance Based Specification for Hotmix Asphalt Wearing Course
Surfacing;
NZTA T10: Specification for State Highway Skid Resistance Management;
AGPT04B-14 Guide to Pavement Technology Part 4B: Asphalt, available at https://www.onlinepublications.austroads.com.au/items/AGPT04B-07 ;
AS 1141.32-1995, Methods for sampling and testing aggregates - Weak particles
(including clay lumps, soft and friable particles) in coarse aggregates , available at http://infostore.saiglobal.com/store/details.aspx?ProductID=214452 ;
ASTM D6307
– 10, Standard Test Method for Asphalt Content of Hot-Mix Asphalt by
Ignition Method ASTM International, available at http://www.astm.org/Standards/D6307.htm
;
Contract quality plans.
2 Assessment against this unit standard must be based on evidence from working at an asphalt, slurry, or cold mix plant and producing bituminous products that are fit for purpose.
Infrastructure ITO
SSB Code 101813

New Zealand Qualifications Authority 2020

NZQA registered unit standard 28690 version 1
Page 2 of 5
3 Competence in this unit standard requires compliance with a bituminous mix plant operating manual.
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.
Operating manuals refers to the plant operating manual and manuals written for specific components or items of plant and equipment that may be published by the manufacturer or the company.
Outcome 1
Prepare for production at a bituminous mix plant.
Range production of at least three types of mix or two types of slurry; mixes – stone mastic asphalt, open graded asphalt, asphaltic concrete; slurry – rut filling, cape seal.
Evidence requirements
1.1 Customers are communicated with and orders taken in accordance with company procedures.
1.2 Job mix formula is checked for material requirements in accordance with company procedures.
Range binder – type, grade, quantity, temperature;
aggregate;
additive
– moisture, source, grading.
1.3 Materials in job mix formula are accessed in accordance with company procedures.
Range check types, quality, and quantities of materials in stock; adapt materials to match job mix formula requirements, check blend; order additional materials for blend change.
1.4 Sampling and testing plan is developed to ensure that requirements of
9803:2013 , RNZ 9805:2009 , and contract quality plans are met.
RNZ
Range contact laboratory for testing plan; aggregates, binders, finished product; testing plan must contain technical data sheets, tolerances.
1.5 Scheduling of production time and load-out is determined in accordance with customer delivery requirements.
Infrastructure ITO
SSB Code 101813

New Zealand Qualifications Authority 2020

NZQA registered unit standard
1.6
28690 version 1
Page 3 of 5
Bituminous mix plant and feeders are checked and set up before operation in accordance with operating manuals.
1.7 Bituminous mix plant is calibrated to consistently produce a uniform mix within the tolerances specified.
Range mix temperature, production rate, moisture content, mixing aggregates for consistent moisture; adjustments – air-flow, fire, fan, water, emulsion.
Outcome 2
Operate a bituminous mix plant to produce surfacing products.
Range at least three mix types, or three slurry types.
Evidence requirements
2.1 A bituminous mix plant is operated in accordance with operating manuals.
Range start-up, hazard identification and control, stock checks, plant checks, feeder checks, calibrations, feeder set-up, moisture content; for viscosity-graded asphalt – change on the run; for slurry – stop and restart.
2.2 Production process is monitored to ensure mix conforms to specifications, and any required actions to maintain tolerances are taken in accordance with company procedures.
Range tolerances may include but are not limited to – temperature, moisture content, air flow, fire.
2.3 All operations are safely completed and workplace and equipment are cleaned in accordance with operating manuals and company procedures.
Range operations
– inventory, machinery check and maintenance, startup, shut-down, load-out.
2.4 Aggregates are protected from weather, segregation, and contamination, and fine aggregates are mixed for consistent moisture in accordance with company procedures.
2.5 Binders and additives are safely handled and stored to avoid product deterioration in accordance with operating manuals and technical data sheets.
Range examples of deterioration include
– polymer agglomeration, emulsion setting, skinning.
2.6 Materials and product sampling and testing are carried out and documented in accordance with the sampling and testing plan.
Infrastructure ITO
SSB Code 101813

New Zealand Qualifications Authority 2020

NZQA registered unit standard
Range
28690 version 1
Page 4 of 5 aggregate (including moisture content and gradation), binder, finished product.
2.7 Bituminous mix product meets target properties specified in contract quality plan.
Range examples of target properties
– tolerance, binder content, air voids.
2.8 All product documentation is completed in accordance with customer requirements, specifications, and contract quality plans.
2.9 Products are despatched in accordance with customer requirements and company procedures.
Outcome 3
Manage environmental protection and plant maintenance at a bituminous mix plant.
Evidence requirements
3.1 Consents are accessed to confirm requirements for environmental protection in accordance with company procedures.
3.2 Environmental protection is planned and emissions are controlled in accordance with consent requirements and operating manuals.
Range emissions – noise, dust, odour, fumes, steam, run-off; control of – load-out, air-flow, wet scrubber, vacuum pump, settling ponds.
3.3 Scheduled downtime and maintenance programmes are allowed for and monitored in relation to production planning.
3.4 Routine maintenance is carried out in accordance with operating manuals, and specialist maintenance is reported and documented in accordance with company procedures.
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
.
Infrastructure ITO
SSB Code 101813

New Zealand Qualifications Authority 2020

NZQA registered unit standard 28690 version 1
Page 5 of 5
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
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