UNIT CODE

DCMCCM632

UNIT TITLE

Determine concrete condition and durability standards

APPLICATION

This unit describes the performance outcomes, skills and knowledge required to analyse the physical and chemical mechanisms that lead to concrete deterioration and the Standards applied for maintenance.

The unit of competency is applied by technicians involved with concrete maintenance to assess maintenance requirements, extend service life, and ensure that safety and performance criteria are met.

No licensing, legislative, regulatory or certification requirements apply to this unit at the time of publication.

• DCMCTP614 Interpret basic concrete tests
• DCMAME629 Use asset management in engineering

ELEMENT

Elements describe the essential outcomes.

PERFORMANCE CRITERIA

Performance criteria describe the performance needed to demonstrate achievement of the element.

1.    Explain the physical mechanisms in concrete that cause deterioration.

1.1.      Outline the plastic and drying shrinkage mechanisms

1.2.      Identity the cracks caused by plastic and drying shrinkage mechanisms

1.3.      Outline factors that lead to thermal cracking and how to identify the cracks

1.4.      Explain the freeze-thaw cycle and impacts upon concrete durability

1.5.      Outline abrasion and erosion mechanisms and their effects

2.    Explain the chemical mechanisms in concrete that cause deterioration.

2.1.      Describe sulphate attack and outline its effects on concrete durability

2.2.      Explain alkali-aggregate reactions in concrete and their effects.

2.3.      Outline the acid-attack mechanism in concrete and its effects

2.4.      Oultine the process leading to corrosion in the steel and the overall effects on concrete durability.

2.5.      Explain the carbonation reaction in concrete and outline its detrimental effects.

3.    Identify and summarise the specifications for achieving concrete durability as per Australian and International standards

3.1.      List and discuss Standard exposure classifications for controlling durability.

3.2.      Explain Standard good-practices in design, supply and construction that ensure concrete durability

3.3.      Explain Standard crack control specifications to ensure concrete durability

4.1.      Explain Standard tests for the assessment of concrete quality in terms of durability.

4.2.      Summarize and describe Standard concrete crack repair and restoration methodologies

FOUNDATION SKILLS

Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.

UNIT MAPPING INFORMATION

No equivalent unit.

TITLE

Assessment requirements for DCMCCM632 Determine concrete condition and durability standards

PERFORMANCE EVIDENCE

To achieve competency in this unit a person must satisfy the requirements of the elements and performance criteria, foundation skills and range of conditions included in the unit.

The person must also:

• Identify and summarise Australian and/or International standards (EN 206, CIA Z7)
• Identify and summarise the repair methodologies in Australian and/or International Standards (CIA Z7/07).
• Explain at least 3 of the following crack repair or restoration methods:
  • Protection against ingress and moisture control by surface sealers, hydrophobic impregnants and surface coatings.
  • Concrete restoration of removed portions by repair mortars and injection grouting.
  • Structural strengthening by adding embedded bars, externally bonded plates.
  • Improve physical and chemical resistance by an additional protective layer of polymer mortar.
  • Preserving and restoring passivity by realkalization and electrochemical chloride extraction.
  • Cathodic protection for preventing steel corrosion.

Note: If a specific volume or frequency is not stated, then evidence must be provided at least once for each criterion.

KNOWLEDGE EVIDENCE

To achieve competency in this unit a person must demonstrate knowledge of:

• Identification and methods for determining concrete condition and maintenance, including:
  
  • Identification of physical and chemical causes of concrete weakening
  • Methods according to Standards for achieving and testing concrete durability

ASSESSMENT CONDITIONS

Assessment conditions:

All assessment must be completed in accordance with work health and safety standards.

When assessments are conducted remotely, invigilation software must be used to ensure authenticity of work completed.

Model answers or marking guides must be provided for all assessments to ensure reliability of assessment judgements when marking is undertaken by different assessors.

The candidate must have access to all tools, equipment, materials and documentation required.

Assessor Requirements:

Assessors must satisfy the assessor requirements in the standards for registered training organisation (RTOs) current at the time of assessment.

Assessors must also hold a tertiary qualification in engineering or related field.

Assessors must have worked for at least 3 years in industry where they have applied the skills and knowledge covered in this unit of competency.

The RTO must also ensure that trainers and assessors keep their industry knowledge up to date through ongoing professional development.

The RTO must take appropriate steps, as an ongoing procedure, to verify information about trainer and assessor’s qualifications, vocational competencies and current industry skills