Major Work Activity E - Cures and protects concrete

Table of Contents

Task E-13 Cures concrete

Task Descriptor

Concrete finishers cure concrete to maximize its strength and increase its durability. Correct temperature and moisture retention is important to the curing process.

E-13.01 - Wet-cures concrete

Essential Skills: Thinking, Document Use, Digital Technology

E-13.01 - Wet-cures concrete
NL NS PE NB QC ON MB SK AB BC NT YT NU
yes NV NV NV yes yes yes ND NV yes ND ND ND
Skills
Reference Code Performance Criteria Evidence of Attainment
E-13.01.01P select and use tools and equipment tools and equipment are selected and used according to application
E-13.01.02P pond (flood) concrete concrete is ponded according to ACI guides, and drawings and specifications
E-13.01.03P apply water using sprinklers sprinklers are set up to continuously apply water onto hardened concrete to maintain moisture and control temperature according to drawings and specifications
E-13.01.04P fog or mist air space surrounding concrete fog or mist is applied to increase humidity level according to drawings and specifications
E-13.01.05P cover concrete with materials materials are used according to ACI guides, and drawings and specifications to maintain required temperature and retain moisture
E-13.01.06P check concrete during curing concrete is checked for temperature and moisture of concrete to ensure the curing process takes place according to CSA A23.1, ACI guides, and drawings and specifications

Range of Variables

Knowledge
Reference Code Learning Outcomes Learning Objectives
E-13.01.01L demonstrate knowledge of the processes, requirements and techniques used in wet-curing concrete identify the tools and equipment and materials used in the process of wet-curing concrete
explain the requirements for proper hydration of concrete during the wet-curing process
explain the requirements for proper temperature of concrete during the wet-curing process
describe the process and techniques of wet-curing concrete
identify types of cement and timings related to curing
explain the consequences of improper curing

Range of Variables

E-13.02 - Chemical cures concrete

Essential Skills: Document Use, Thinking, Working with Others

E-13.02 - Chemical cures concrete
NL NS PE NB QC ON MB SK AB BC NT YT NU
yes NV NV NV yes yes yes ND NV yes ND ND ND
Skills
Reference Code Performance Criteria Evidence of Attainment
E-13.02.01P select curing compound curing compound is selected according to drawings and specifications
E-13.02.02P select and use tools and equipment tools and equipment are selected and used according to application
E-13.02.03P apply curing compound curing compound is applied to ensure complete and uniform coverage

Range of Variables

Knowledge
Reference Code Learning Outcomes Learning Objectives
E-13.02.01L demonstrate knowledge of applications and procedures used in chemical curing identify types of curing compounds
identify types of cement and timings related to curing
describe the effects of curing compounds on the curing process
identify the risks associated with and the safe work practices of applying curing compounds
describe application procedure of curing compounds
identify timing for the application of curing compounds
describe safe work practices pertaining to the use of seamless systems

Range of Variables

Task E-14 Creates contraction joints

Task Descriptor

Contraction joints are placed in green concrete in pre-determined locations in an effort to control cracking caused by drying shrinkage.

E-14.01 - Saw cuts contraction joints

Essential Skills: Document Use, Numeracy, Thinking

E-14.01 - Saw cuts contraction joints
NL NS PE NB QC ON MB SK AB BC NT YT NU
yes NV NV NV yes yes yes ND NV yes ND ND ND
Skills
Reference Code Performance Criteria Evidence of Attainment
E-14.01.01P identify location, spacing and depth of contraction joints location, spacing and depth of contraction joints are identified according to drawings and specifications, CSA A23.1 and industry practices
E-14.01.02P install contraction joints in green concrete contraction joints are installed in designated locations to promote controlled cracking
Knowledge
Reference Code Learning Outcomes Learning Objectives
E-14.01.01L demonstrate knowledge of tools and equipment and procedures to saw cut contraction joints identify tools and equipment required for wet and early entry cutting
describe procedures for saw cutting contraction joints

Range of Variables

E-14.02 - Fills joints

Essential Skills: Thinking, Document Use, Working with Others

E-14.02 - Fills joints
NL NS PE NB QC ON MB SK AB BC NT YT NU
yes NV NV NV yes yes yes ND NV yes ND ND ND
Skills
Reference Code Performance Criteria Evidence of Attainment
E-14.02.01P clean joints joints are cleaned to remove contaminants and promote bonding
E-14.02.02P place a backing rod in joints a backing rod is placed to control joint filler depth and surface profile finish according to drawings and specifications
E-14.02.03P mix joint sealant or joint filler joint sealant or joint filler is mixed according to manufacturers' instructions
E-14.02.04P install joint sealant or joint filler joint sealant is installed to keep joint clean, and joint filler is installed to protect joint edges from solid tire traffic according to manufacturers' instructions

Range of Variables

Knowledge
Reference Code Learning Outcomes Learning Objectives
E-14.02.01L demonstrate knowledge of tools and equipment and procedures to fill contraction joints identify tools and equipment required for filling joints
describe procedures for filling contraction joints
identify timing and conditions for application of joint filling

Task E-15 Protects concrete

Task Descriptor

Concrete finishers need to physically protect concrete from the surrounding elements, temperature variations and access during its setting and hardening. This helps to improve durability of the concrete and protect it from damage.

E-15.01 - Protects plastic concrete

Essential Skills: Document Use, Digital Technology, Thinking

E-15.01 - Protects plastic concrete
NL NS PE NB QC ON MB SK AB BC NT YT NU
yes NV NV NV yes yes yes ND NV yes ND ND ND
Skills
Reference Code Performance Criteria Evidence of Attainment
E-15.01.01P insulate surface of concrete surface of concrete is insulated with materials for heat retention
E-15.01.02P identify concrete temperature concrete’s temperature is identified
E-15.01.03P wet sub-base, formwork and other contact surfaces sub-base, formwork and other contact surfaces are wet to avoid wicking and maintain moisture of concrete
E-15.01.04P set up hoarding and heaters hoarding and heaters are set up to prevent concrete from freezing
E-15.01.05P set up wind breaks and shade wind breaks and shade are set up to prevent concrete from freezing and protect from surface drying and hot weather
E-15.01.06P apply evaporation reducers evaporation reducers are applied to prevent surface moisture loss
E-15.01.07P restrict access using barricades barricades are used to restrict access

Range of Variables

Knowledge
Reference Code Learning Outcomes Learning Objectives
E-15.01.01L demonstrate knowledge of how temperature affects concrete describe the effects of ground and air temperature on concrete
identify temperature of concrete and its effect on set
identify temperature ranges for curing processes
identify plan to control the weather variables
identify the effects of water, ice and warm water on the concrete mix

Range of Variables

E-15.02 - Protects hardened concrete

Essential Skills: Document Use, Numeracy, Thinking

E-15.02 - Protects hardened concrete
NL NS PE NB QC ON MB SK AB BC NT YT NU
yes NV NV NV yes yes yes ND NV yes ND ND ND
Skills
Reference Code Performance Criteria Evidence of Attainment
E-15.02.01P insulate work area work area is insulated with materials for heat retention
E-15.02.02P set up hoarding and heaters hoarding and heaters are set up to prevent concrete from freezing
E-15.02.03P restrict access using barricades barricades are used to restrict access
E-15.02.04P set up reshoring reshoring is set in correct location

Range of Variables

Knowledge
Reference Code Learning Outcomes Learning Objectives
E-15.02.01L demonstrate knowledge of how temperature affects concrete describe the effects of ground and air temperature on concrete
identify temperature ranges for curing processes
identify plan to control the weather variables

Range of Variables