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A. Piles shall be either steam cured or water cured. If water curing is used,the piles shall be kept continuously wet by
<br /> the application of water in conformance with the provisions in Section 90-7.04A,"Water Method."
<br /> B. If steam curing is used,the steam curing provisions in Section 90-7.04, "Curing Precast Concrete Members," shall
<br /> apply except that the piles shall be kept continuously wet for their entire length for a period of not less than 3 days,
<br /> including the holding and steam curing periods.
<br /> 90-7.06 CURING SLOPE PROTECTION
<br /> • Concrete slope protection shall be cured in conformance with any of the methods specified in Section 90-7.01,
<br /> "Methods of Curing."
<br /> • Concreted-rock slope protection shall be cured in conformance with any of the methods specified in
<br /> Section 90-7.01, "Methods of Curing," with a blanket of earth kept wet for 72 hours, or by sprinkling with a fine spray of
<br /> water every 2 hours during the daytime for a period of 3 days.
<br /> 90-7.07 CURING MISCELLANEOUS CONCRETE WORK
<br /> • Exposed surfaces of curbs shall be cured by pigmented curing compounds as specified in Section 90-7.0113,"Curing
<br /> Compound Method."
<br /> • Concrete sidewalks, gutter depressions, island paving, curb ramps, driveways, and other miscellaneous concrete
<br /> areas shall be cured in conformance with any of the methods specified in Section 90-7.01,"Methods of Curing."
<br /> • Shotcrete shall be cured for at least 72 hours by spraying with water, by a moist earth blanket, or by any of the
<br /> methods provided in Section 90-7.01,"Methods of Curing."
<br /> • Mortar and grout shall be cured by keeping the surface damp for 3 days.
<br /> • After placing,the exposed surfaces of sign structure foundations,including pedestal portions,if constructed,shall be
<br /> cured for at least 72 hours by spraying with water, by a moist earth blanket, or by any of the methods provided in
<br /> Section 90-7.01,"Methods of Curing."
<br /> 90-8 PROTECTING CONCRETE
<br /> 90-8.01 GENERAL
<br /> • In addition to the provisions in Section 7-1.16, "Contractor's Responsibility for the Work and Materials," the
<br /> Contractor shall protect concrete as provided in this Section 90-8. If required by the Engineer,the Contractor shall submit a
<br /> written outline of the proposed methods for protecting the concrete.
<br /> • The Contractor shall protect concrete from damage from any cause,which shall include,but not be limited to: rain,
<br /> heat,cold,wind,Contractor's actions,and actions of others.
<br /> • Concrete shall not be placed on frozen or ice-coated ground or subgrade nor on ice-coated forms,reinforcing steel,
<br /> structural steel,conduits,precast members,or construction joints.
<br /> • Under rainy conditions, placing of concrete shall be stopped before the quantity of surface water is sufficient to
<br /> damage surface mortar or cause a flow or wash of the concrete surface,unless the Contractor provides adequate protection
<br /> against damage.
<br /> • Concrete that has been frozen or damaged by other causes, as determined by the Engineer, shall be removed and
<br /> replaced by the Contractor at the Contractor's expense.
<br /> 90-8.02 PROTECTING CONCRETE STRUCTURES
<br /> • Structure concrete and shotcrete used as structure concrete shall be maintained at a temperature of not less than 7°C
<br /> for 72 hours after placing and at not less than 4°C for an additional 4 days.
<br /> 90-8.03 PROTECTING CONCRETE PAVEMENT
<br /> • Pavement concrete shall be maintained at a temperature of not less than 4°C for 72 hours.
<br /> • Except as provided in Section 7-1.08, "Public Convenience,"the Contractor shall protect concrete pavement against
<br /> construction and other activities that abrade, scar, discolor,reduce texture depth, lower coefficient of friction, or otherwise
<br /> damage the surface. Stockpiling,drifting, or excessive spillage of soil, gravel,petroleum products, and concrete or asphalt
<br /> mixes on the surface of concrete pavement is prohibited unless otherwise specified in these specifications, the special
<br /> provisions or permitted by the Engineer.
<br /> • If ordered by the Engineer or shown on the plans or specified in the special provisions,pavement crossings shall be
<br /> constructed for the convenience of public traffic. The material and work necessary for the construction of the crossings, and
<br /> their subsequent removal and disposal,will be paid for at the contract unit prices for the items of work involved and if there
<br /> are no contract items for the work involved, payment for pavement crossings will be made by extra work as provided in
<br /> Section 4-1.03D, "Extra Work.". Where public traffic will be required to cross over the new pavement, Type III portland
<br /> cement may be used in concrete,if permitted in writing by the Engineer. The pavement may be opened to traffic as soon as
<br /> Contract No. 10-OM7104
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