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MINISTRY OF HOUSING Western Sector Projects Sitework & Infrastructure OMRANIA and ASSOCIATES
Project Specification
SECTION 03 39 00 CONCRETE CURING PART 1: GENERAL 1.01 A. 1.02
SECTION INCLUDES Curing of cast-in-place and precast concrete. RELATED SECTIONS
A.
Section 01 33 00
Submittal Procedures.
B.
Section 03 30 00
Cast In Place Concrete.
C.
Section 03 35 23
Exposed Aggregate Concrete Finishing.
1.03
REFERENCES
A.
ACI 301
Structural Concrete for Buildings.
B.
ACI 302
Recommended Practice for Concrete Floor and Slab Construction.
C.
ACI 308
Standard Practice for Curing Concrete.
D.
ASTM C 171
Sheet Materials for Curing Concrete.
E.
ASTM C 309
Liquid Membrane-Forming Compounds for Curing Concrete.
1.04
SUBMITTALS
A.
Comply with Section 01 33 00.
B.
Product Data: Provide data on all items specified under this Section.
1.05 A.
QUALITY ASSURANCE Perform work in accordance with ACI 301 and ACI 302.
PART 2: PRODUCTS
2.01
ACCEPTABLE MANUFACTURERS Not used.
2.02 A.
CURING COMPOUNDS Use suitable curing compounds only with the written approval of the Engineer. Curing compounds shall be in accordance with ASTM C 309. Submit both the proposed dosage and method of application to the Engineer.
CONCRETE CURING
SECTION 03 39 00-1
MINISTRY OF HOUSING Western Sector Projects Sitework & Infrastructure OMRANIA and ASSOCIATES
Project Specification
B.
Approve the use of the curing compound on surfaces which are to receive a bonded finish only when it is proven beyond doubt that the use of the compound has no detrimental effect on the applied finish.
C.
Curing compounds shall contain a dye to enable the extent of the spread to be seen easily.
D.
Use curing compounds on surfaces exposed to the sky, containing sufficiently finely divided flake aluminum in suspension to produce a complete coverage of the surface with a metallic finish when applied at the rate recommended by the manufacturer.
E.
Curing compounds shall become stable and impervious to the evaporation of water from the concrete surface within sixty minutes of application. The material shall not react chemically with the concrete, crack, peel or disintegrate within three weeks after application.
2.03
SHEET MATERIALS FOR CURING CONCRETE
A.
Sheet materials for curing concrete shall be in accordance with ASTM C 171.
B.
Polyethylene film shall have a minimum thickness of 0.15 mm or as indicated on the Drawings whichever is more.
2.04 A.
WATER Water used for curing shall be of the same quality as that used for mixing concrete as described in Section 03 30 00.
PART 3: EXECUTION 3.01
GENERAL
A.
Cure surfaces in accordance with the recommendations of ACI 308.
B.
Immediately after compaction and for 7 days thereafter, protect concrete against harmful effects of weather, including rain, rapid temperature changes, and from drying out. The methods of protection used shall be subject to the acceptance of the Engineer.
C.
Use such methods of curing that prevent loss of moisture from the concrete. On concrete surfaces which are to be waterproofed, do not use curing compounds. Details of all curing methods to be used shall be subject to the approval of the Engineer.
3.02
METHODS OF CURING
A.
For Formed Surfaces: Unless otherwise agreed by the Engineer, all formwork shall remain in place for at least 48 hours; form when forms are removed within 7 days of casting, cure the exposed concrete surface. Use insulated steel or timber for formwork which remains in place.
B.
In cases where formwork is removed within 7 days of casting, cover the exposed concrete surfaces closely with impermeable sheeting, properly secured to prevent its removal by wind and the development of air spaces beneath it. Alternatively keep the exposed surfaces continuously wet by means of a water spray or by covering with a water absorbent material which is kept wet. Subject to the approval of the Engineer, apply pigmented reflective curing compound immediately to the surface.
CONCRETE CURING
SECTION 03 39 00-2
MINISTRY OF HOUSING Western Sector Projects Sitework & Infrastructure OMRANIA and ASSOCIATES
Project Specification
C.
For other surfaces the above methods shall be acceptable subject to the additional requirement that when the area considered is exposed to the effects of sun or wind, provide ponding to a depth of at least 50 mm. Start ponding as soon as possible after the end of concreting, but not before the concrete can resist surface damage.
D.
When the humidity is less than 50% and the wind speed exceeds 4 m/s, provide shelter to the concrete, during casting and for a period of at least 24 hours after casting. This shall be in addition to the curing procedures described previously. Formwork left in place shall be regarded as sheltering.
E.
Limit the development of temperature differentials in concrete after placing by any means appropriate to the circumstances as accepted by the Engineer.
