Curing and Protection. The Contractor shall take adequate measures to ensure that the concrete shall be kept damp continuously for a minimum of three (3) days after casting or for such other time as the Engineer may direct. After removal of this covering (layer of sacking, canvas, Hessian, straw mats or similar absorbent material or a layer of sand), the concrete shall then be sprayed with water for minimum period of a further fourteen (14) days. All concrete liable to be affected by running water or wave action shall be adequately protected from damage during the setting period and all temporary protection works shall be to the satisfaction of the Engineer.
Curing and Protection. Add the following to Clause 5.5.8: Notwithstanding the provisions of a) to g) above, curing shall be achieved using an approved curing compound (applied in accordance with the manufacturer’s specifications) in addition to water curing and well-secured plastic sheeting (where possible). The curing compound used shall be to the approval of the Engineer. Wax based curing compounds will not be permitted. Water curing alone shall not be permitted. Where the Contractor fails to make adequate provision for ensuring proper curing for a minimum continuous period of 7 days, the Engineer may condemn the affected pour whereupon the affected area shall be broken-out and replaced at the Contractor’s cost. Where the Engineer does not require the affected concrete to be broken out and replaced, the Engineer shall deduct 10% of the measured concrete volume for not fully meeting the specification. The curing compound shall be applied immediately as formwork is progressively stripped or, in the case of unformed surfaces, when the concrete has taken its initial set. It shall preferably be applied by spraying and the rate of application shall be strictly in accordance with the manufacturer's recommendations. A method of monitoring the area to which curing compound has been applied and the application rate shall be as approved by the Engineer and rigidly applied by the Contractor. Minimum stripping times for formwork shall be strictly observed (Table 2 of subclause 5.2.5.2 shall apply).
Curing and Protection. Add Paragraph 3.7.B to read as follows: B Seal all joints in slab-on-grade and structural platform. END OF SECTION 03300 SECTION 03350 CONCRETE FINISHING The provisions of the DART Standard Specification Section 03350, “Concrete Finishing”, shall apply to the Work as modified herein.
Curing and Protection. Protect the finished subgrade against drying for 72 hours after compaction by spraying with water to maintain a continuous moist condition. The Contractor may apply an asphalt prime coat immediately after trimming instead of keeping the finished surface moist with water. If this option is chosen, apply SS-1H or CSS-1H at the rate of 0.22 gallons per square yard to achieve a minimum of 0.13 gallons per square yard residue. Multiple light applications may be necessary to obtain the specified rate of application without run-off. Avoid placing construction loads or operating equipment until the treated subgrade has cured and can withstand the loads without damaging the subgrade. If the subgrade deforms under the construction loads and cannot return back to its original condition, or if it deflects more than 1 inch, allow the subgrade additional curing time before operating equipment on the subgrade. Repair any damaged subgrade. Cover the finished treated subgrade with surfacing before it is subjected to freezing. If the finished treated subgrade is subjected to freezing, the Engineer will determine when the subgrade needs to be reworked. KDOT will not pay for the replacement and refinishing of the treated subgrade if the material loses the required stability, density or finish before the next course is placed.
Curing and Protection. A. Curing: All newly placed concrete shall be cured by one or more of the following methods:
Curing and Protection. Care must be taken that no concrete is allowed to become prematurely dry and the fresh concrete must be carefully protected within two hours of placing from rain, sun and wind by means of hessian sacking, polythene sheeting, or other approved means. This protective layer and the concrete itself must be kept continuously wet for at least seven days after the concrete has been placed. The Contractor will be required to provide complete coverage of all fresh concrete for a period of 7 days. Hessian or polythene sheeting shall be in the maximum widths obtainable and shall be secured against wind. The Contractor will not be permitted to use old cement bags, hessian or other material in small pieces. Concrete in foundations and other underground work shall be protected from admixture with falling earth during and after placing. Traffic or loading must not be allowed on the concrete until the concrete is sufficiently matured, and in no case shall traffic or loading be of such magnitude as to cause deflection or other movement in the formwork or damage to the concrete members. Where directed by the Engineer props may be required to be left in position under slabs and other members for greater periods than those specified hereafter.
Curing and Protection. A. General: Start initial curing as soon as free water has disappeared from the concrete surface after placing and finishing. Keep concrete continuously moist for seven days minimum after placement.
Curing and Protection. 3.10.1. Comply with requirements of ACI 308. Immediately after placement, protect concrete from premature drying, excessively hot or cold temperatures, and mechanical injury.
