Major Work Activity E – Cures and protects concrete

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

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
	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

tools and equipment includes: sprinklers, soaker hose, fogging and misting systems

materials include: wet burlap, curing blankets, polyethylene sheeting

	Knowledge
	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

tools and equipment includes: sprinklers, soaker hose, fogging and misting systems

materials include: wet burlap, curing blankets, polyethylene sheeting

E-13.02 Chemical cures concrete

Essential Skills

Document Use, Thinking, Working with Others

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
	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

curing compounds include: clear membrane, fugitive dye, dissipating curing compound, water-based, solvent-based

tools and equipment include: roller, spray can, PPE

	Knowledge
	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

curing compounds include: clear membrane, fugitive dye, dissipating curing compound, water-based, solvent-based

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

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
	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
	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

tools and equipment include: string line, measuring tape, chalk line, wet saw, early entry saw, cut-off saw (quick cut)

E-14.02 Fills joints

Essential Skills

Thinking, Document Use, Working with Others

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
	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

joint sealant or joint filler include: self-levelling, non-sag

	Knowledge
	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

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
	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

materials include: straw and polyethylene, insulated tarps, electric blankets

barricades include: caution tape, ribbon, safety fence, pylons, wooden barricades

	Knowledge
	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

weather variables include: wind, sun, rain, snow, humidity, temperature

E-15.02 Protects hardened concrete

Essential Skills

Document Use, Numeracy, Thinking

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
	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

materials include: straw and polyethylene, insulated tarps, electric blankets, reshoring

barricades include: caution tape, ribbon, safety fence, pylons, wooden barricades

	Knowledge
	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

weather variables include: wind, sun, rain, snow, humidity, temperature

Date modified:: 2018-01-11

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Major Work Activity E – Cures and protects concrete

Task E-13 Cures concrete

Task Descriptor

E-13.01 Wet-cures concrete

Essential Skills

Range of Variables

Range of Variables

E-13.02 Chemical cures concrete

Essential Skills

Range of Variables

Range of Variables

Task E-14 Creates contraction joints

Task Descriptor

E-14.01 Saw cuts contraction joints

Essential Skills

Range of Variables

E-14.02 Fills joints

Essential Skills

Range of Variables

Task E-15 Protects concrete

Task Descriptor

E-15.01 Protects plastic concrete

Essential Skills

Range of Variables

Range of Variables

E-15.02 Protects hardened concrete

Essential Skills

Range of Variables

Range of Variables