A06_-_140L1722Q0031-Section_033550_1.docx

Bureau of Land Management - Colorado State Office

033550 INTEGRALLY COLORED CONCRETE

GENERAL

SUMMARY:

Section Includes: Requirement for furnishing, mixing, and curing integrally colored concrete required for all concrete in this contract.

REFERENCES:

American Society for Testing and Materials:

SUBMITTALS:

General: Shall be according to Section 01009 - General Information and Requirements. Submit 1 copy of product data and manufacturer's instructions for each of the following.

Dayton Superior Cure & Seal 309 J18 shall be used to cure and seal the concrete.

Form release agent (in the event stamped concrete is not used): Dayton Superior Clean Strip C & M (J-1-A).

Sample for Verification: Submit sample chip of specified concrete colors indicating Davis color name.

Concentrated pigments specially processed for mixing into concrete and complying with ASTM C979

PRODUCTS:

MATERIALS:

Integral Colors:

Flatwork Contractor shall verify with the Project Inspector that the concrete color will be Yosemite Brown 2 lb dry #641 / 94 lb sack cement as supplied by Davis Colors: 3700 East Olympic Blvd. Los Angeles CA 90023: http://www.daviscolors.com/ColorCard#concrete Follow color manufacturer instructions.

Admixtures: Do not use calcium chloride admixtures. Follow all recommendations of the color manufacture.

Concrete Cure and Sealer (in the event stamped concrete is not used): Curing compound shall be membrane-forming curing compound formulated for colored concrete and complying with ASTM C309. Contractor shall use Dayton Superior Cure & Seal 309 J18. No substitutions will be allowed.

In the event stamped concrete is not used, form release agent shall be Clean Strip C & M (J1A) manufactured by Dayton Superior.

EXECUTION:

APPLICATION:

Colored Concrete: All concrete identified on Contract Drawings to be colored will be colored concrete according to this Section.

Uniform Mix: Use the same pigment-to-cement ratio, type and brand of cement and aggregates throughout the project. All concrete must come from the same batch plant unless approved in writing from the Project Inspector. All ingredients shall be weighed. Add color as recommended by the manufacturer of the concrete color. The mixing operation shall be adequate to uniformly disperse the color throughout each batch by following manufacturer’s recommendations.

Curing and Sealing: Cure and seal colored concrete as recommended by the color manufacture and cure and seal manufacture. The following are in addition to the manufacturers’ recommendations Apply with a roller or a powered airless sprayer. Applying with a garden or construction pump canister type sprayer does not atomize the spray adequately and are therefore not allowed.

Maintain concrete between 65F and 85F during curing.

Apply a second coat 24 hours after the first coat.

Refer to Section 03 35 33 Stamped Concrete if placing stamped concrete.

Cleaning: Wash and thoroughly clean the mixer and transporting equipment before mixing colored concrete.

Tolerances: Minor variations in appearance of colored concrete, which are similar to natural variations in color and appearance of unpigmented concrete, are acceptable.

Form Release: Apply the form release specified above as recommended by the manufacturer.

Water on Concrete Surface: Absolutely no water will be applied to the concrete surface or to brooms or other hand tools at any time.

Surface Contamination: No products, except what is specified in this contract, will be allowed to be applied to the surface – no cement and no water.

MEASUREMENT AND PAYMENT

METHOD OF MEASUREMENT:

Units: The work described in this section will not be measured for payment.

BASIS OF PAYMENT:

Payment: No direct payment for the work described under this section will be made. The Contractor shall include consideration for this item in the bid price for other items of the Contract.

END OF SECTION