NZQA registered unit standard
18346 version 4
Page 1 of 3
Title
Demonstrate knowledge of curing methods for concrete construction
Level
3
Credits
5
Purpose
People credited with this unit standard are able to: identify the
properties of hardened concrete; explain the curing process for
concrete; and outline factors that affect the quality of concrete.
Classification
Concrete > Concrete Technology
Available grade
Achieved
Explanatory notes
Legislation and publications relevant to this unit standard include:
Health and Safety in Employment Act 1992;
NZS 3109:1997 Concrete construction; NZS 3101 Parts 1 and 2:1995 Concrete structures
standard – The design of concrete structures, available from Standards New Zealand
(http://www.standards.co.nz).
Outcomes and evidence requirements
Outcome 1
Identify the properties of hardened concrete.
Evidence requirements
1.1
The factors influencing the strength of concrete are identified in terms of
water/cement ratio and degree of compaction.
Range
1.2
factors include but are not limited to – age, curing.
The strength of concrete is described in terms of its different types.
Range
types include but are not limited to – compressive strength, tensile
strength, flexural strength, shear strength.
Building and Construction Industry Training
Organisation
SSB Code 101562
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
18346 version 4
Page 2 of 3
Outcome 2
Explain the curing process for concrete.
Evidence requirements
2.1
The purpose of curing is explained in terms of the appropriate methods for
particular conditions.
Range
2.2
conditions could include but are not limited to – moisture,
temperature, differential shrinkage, frost expansion, temporary
loads, design loads, differential expansion.
The requirements for the protection of concrete are explained in terms of hot
and cold conditions.
Range
requirements include but are not limited to – retaining moisture,
preventing excessive temperature differentials, reducing hardening
time.
2.3
The factors which govern the striking times for formwork are explained in terms
of concrete strength, treatment of the concrete surface and economics.
2.4
The purpose of accelerated curing is described in terms of established methods.
Range
2.5
established methods include but are not limited to – use of finer
cement, chemical methods, thermal methods.
Requirements for avoiding cracking in large pours of concrete are identified in
terms of high and low strength concrete.
Range
requirements include but are not limited to – concrete mix
proportions, type of cementitious material, concrete placing
temperature, ambient conditions, formwork and insulation.
Outcome 3
Outline factors that affect the quality of concrete.
Evidence requirements
3.1
The terms modules of elasticity, creep, drying shrinkage, moisture movement
and thermal movement are explained in terms of concrete production.
3.2
The factors affecting dimensional changes are explained in terms of their effects
on quality.
3.3
The durability of concrete is explained in terms of the causes of deterioration.
3.4
Factors affecting the resistance of concrete to deterioration are identified in
terms of abrasion, fire, frost, chemical attack, and carbonation.
Building and Construction Industry Training
Organisation
SSB Code 101562
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
3.5
18346 version 4
Page 3 of 3
The deleterious effects on concrete that can occur in sulphate-bearing ground
and in a marine environment are described in terms of precautions taken to
ensure good durability.
Planned review date
31 December 2013
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
23 May 2001
N/A
Revision
2
16 July 2004
N/A
Rollover and
Revision
3
25 January 2008
N/A
Rollover and
Revision
4
17 November 2011
N/A
Consent and Moderation Requirements (CMR) reference
0048
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 Building and Construction Industry Training Organisation
national.office@bcito.org.nz if you wish to suggest changes to the content of this unit
standard.
Building and Construction Industry Training
Organisation
SSB Code 101562
 New Zealand Qualifications Authority 2016