Table of Contents
Task C-7 Places concrete
Task Descriptor
Concrete finishers may transport concrete from the truck to the desired point of discharge. Prior to establishing elevation, they consolidate concrete to remove air pockets that could cause architectural or structural defects. They spread to a rough grade before achieving final elevation.
C-7.01 - Transports concrete on-site
Essential Skills: Oral Communication, Thinking, Working with Others
C-7.01 - Transports concrete on-site
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| C-7.01.01P |
select and use placement method |
placement method is selected and used according to accessibility to location and size of job |
| C-7.01.02P |
determine starting point of concrete placement |
starting point for concrete placement is determined according to industry practices |
| C-7.01.03P |
verify concrete type |
concrete type is verified by matching concrete delivery ticket to drawings and specifications |
| C-7.01.04P |
confirm slump and consistency |
slump and consistency are confirmed according to slump test, drawings and specifications |
| C-7.01.05P |
operate discharge hose |
discharge hose is operated according to site conditions and industry documents and practices |
| C-7.01.06P |
operate power buggy |
power buggy is operated according to site conditions, manufacturers’ instructions, and industry documents and practices |
| C-7.01.07P |
operate crane bucket discharge handle |
crane bucket discharge handle is operated according to site conditions and industry documents and practices |
| C-7.01.08P |
convey concrete |
concrete is conveyed using conveying equipment according to site conditions and industry documents and practices |
| C-7.01.09P |
operate wheelbarrow |
wheelbarrow is operated according to site conditions and industry practices |
| C-7.01.10P |
deposit concrete |
concrete is deposited at rough grade according to industry practices |
Range of Variables
- placement method includes: using concrete pump, crane and bucket, wheelbarrow, chute, tremies
- site conditions include: weather conditions, location of equipment, starting point, sequence of placement, rate of placement and drop
- conveying equipment includes: tele-belt truck, ready-mix truck mounted conveyor, trailers
Knowledge
| Reference Code |
Learning Outcomes |
Learning Objectives |
| C-7.01.01L |
demonstrate knowledge of the tools and equipment and the procedures used to transport concrete |
describe conveying equipment, their application and procedures for use |
| describe the cause of segregation and use of related tools and equipment |
| identify transportation methods for moving and placing concrete |
| identify regulations pertaining to the transportation of concrete |
| describe time restriction and CSA A23.1 requirements for transporting of concrete |
| identify site preparation for the placement of concrete |
| describe slump and consistency testing methods |
Range of Variables
- conveying equipment includes: tele-belt truck, ready-mix truck mounted conveyor, trailers
- related tools and equipment includes: chutes, vibrators, pumps
- transportation methods include: pumping, using conveyors, power buggy, crane bucket, wheelbarrow and pails
C-7.02 - Spreads concrete
Essential Skills: Oral Communication, Working with Others, Thinking
C-7.02 - Spreads concrete
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| C-7.02.01P |
determine width of screed (strips/lanes) |
width of screed (strips/lanes) is determined according to size of the pour, screeding method and site conditions |
| C-7.02.02P |
identify locations of related mechanical installations |
locations of related mechanical installations are identified and visibly marked to avoid damage and being covered during placement according to industry practices |
| C-7.02.03P |
maintain location of embedded reinforcements |
location of embedded reinforcements is maintained according to drawings and specifications |
| C-7.02.04P |
distribute concrete |
concrete is distributed evenly at rough grade |
Range of Variables
- related mechanical installations include: floor drains, clean-outs, electrical boxes, catch basins
- embedded reinforcements include: synthetic and steel fibre, dowels, welded wire mesh, rebar, post-tensioning cables
Knowledge
| Reference Code |
Learning Outcomes |
Learning Objectives |
| C-7.02.01L |
demonstrate knowledge of the procedures used to spread concrete |
identify tools for spreading concrete and describe their procedures for use |
| identify types of embedded reinforcement, their applications and procedures for use |
| identify the effects of embedded reinforcement on handling of concrete |
| explain the concept of distributing concrete starting from the nearest known level of elevation |
Range of Variables
- embedded reinforcements include: synthetic and steel fibre, dowels, welded wire mesh, rebar, post-tensioning cables
C-7.03 - Consolidates concrete
Essential Skills: Thinking, Working with Others, Oral Communication
C-7.03 - Consolidates concrete
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| C-7.03.01P |
determine consolidation technique |
consolidation technique is determined according to site conditions and industry practices |
| C-7.03.02P |
select and use tools and equipment |
tools and equipment are selected and used according to consolidation technique and CSA A23.1 |
| C-7.03.03P |
determine and adhere to field and frequency of vibration |
field and frequency of vibration is determined and adhered to according to CSA A23.1 and to prevent defects |
| C-7.03.04P |
check after concrete is consolidated for straightness and dimensions of formwork |
straightness and dimensions of formwork are determined by drawings and specifications |
Range of Variables
- consolidation techniques include: internal vibration, external vibration, vibrating screeds
- tools and equipment include: immersion vibrator, external vibrator, surface vibrator, vibrating tables, hammers, rods, spades
- defects include: segregation, honeycombs, pin holes, delamination
Knowledge
| Reference Code |
Learning Outcomes |
Learning Objectives |
| C-7.03.01L |
demonstrate knowledge of the tools and equipment, and procedures used to consolidate concrete |
identify tools and equipment used to consolidate concrete |
| identify types and sizes of vibrators, their application and procedures for use |
| identify consolidation techniques, their applications and procedures |
| C-7.03.02L |
demonstrate knowledge of the various effects and outcomes of consolidating procedures |
describe the effect of vibration on forms |
| describe defects and how to avoid them |
| describe effects of over-vibrating on aggregate, embedded reinforcement and slump consistency |
Range of Variables
- tools and equipment include: immersion vibrator, external vibrator, surface vibrator, vibrating tables, hammers, rods, spades
- consolidation techniques include: internal vibration, external vibration, vibrating screeds
- defects include: segregation, honeycombs, pin holes, delamination
Task C-8 Levels concrete
Task Descriptor
Concrete finishers level concrete and establish elevations using wet screeds, screeds, bull floats and related tools to achieve required tolerances.
C-8.01 - Establishes elevation
Essential Skills: Numeracy, Document Use, Thinking
C-8.01 - Establishes elevation
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| C-8.01.01P |
identify benchmarks |
benchmarks are identified according to drawings and specifications |
| C-8.01.02P |
determine elevation tools used for establishing elevations |
elevation tools are identified according to industry practices |
| C-8.01.03P |
perform calculations |
calculations are performed to establish elevations and slopes according to drawings and specifications |
| C-8.01.04P |
transfer benchmark elevation |
benchmark elevation is transferred to work area according to drawings and specifications |
| C-8.01.05P |
place wet screeds |
wet screeds are placed according to the predetermined size of the placement strips |
| C-8.01.06P |
check and confirm finish grade |
finish grade is checked periodically during placement according to industry practices |
Range of Variables
- elevation tools include: string lines, gauges, laser levels, hand levels, builder’s levels, water levels
Knowledge
| Reference Code |
Learning Outcomes |
Learning Objectives |
| C-8.01.01L |
demonstrate knowledge of the tools and equipment and the procedures used to establish elevations |
describe procedures for establishing elevation |
| explain slope and fall to achieve varying elevations |
| describe calculations performed to establish elevation |
| describe placement of screed guides when levelling concrete |
C-8.02 - Screeds concrete
Essential Skills: Thinking, Working with Others, Oral Communication
C-8.02 - Screeds concrete
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| C-8.02.01P |
select screeding tools and equipment |
screeding tools and equipment are selected according to tolerances and drawings and specifications |
| C-8.02.03P |
screed concrete |
screed concrete according to screed guides, elevation heights or existing formwork, drawings and specifications |
Knowledge
| Reference Code |
Learning Outcomes |
Learning Objectives |
| C-8.02.01L |
demonstrate knowledge of the tools and equipment, and the techniques used to screed concrete |
identify manual and mechanical screeds and their applications |
| describe techniques for screeding concrete |
| explain the purpose of screeding concrete |
| explain tolerances and describe their purpose as it pertains to levelling concrete |
| describe methods used to achieve tolerances (F L and F F) |
Range of Variables
- manual and mechanical screeds include: screed rods – single/double (straightedge), truss screed, roller screed, screed rail, power screed, laser screed
C-8.03 - Bull floats concrete
Essential Skills: Thinking, Oral Communication, Working with Others
C-8.03 - Bull floats concrete
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Skills
| Reference Code |
Performance Criteria |
Evidence of Attainment |
| C-8.03.01P |
select type of bull float and length of handle |
type of bull float and length of handle are selected according to size of pour and type of concrete |
| C-8.03.02P |
adjust pitch |
pitch is adjusted according to slump of concrete |
| C-8.03.03P |
smooth surface of concrete to finished grade |
surface of concrete is smoothed according to industry practices |
Knowledge
| Reference Code |
Learning Outcomes |
Learning Objectives |
| C-8.03.01L |
demonstrate knowledge of the tools and the techniques used to bull float concrete |
identify the tools used to bull float concrete |
| explain when to begin bull floating |
| describe the purpose of bull floating the concrete |
| describe the procedure of bull floating the concrete |