RESOURCE CENTER has: F.A.Q (QUESTIONS) REFERENCE MATERIALS COLOR SPECIFICATIONS
		Description: Dry powdered pigment for coloring concrete, stucco, plaster and other cementitious mixtures. Pigments are inert, inorganic (except Deep Black) non-fading mineral oxides that easily disperse in cement mixes.  Lambco Color pigments comply with ASTM C-979 "Pigments for Integrally Colored Concrete".
		Applications: Colored concrete is one of the most visible sales tools in building and concrete construction. Color pigment can be and has been utilized in the following applications: Cast-in-place concrete Precast concrete panel or structural elements Concrete masonry units (architectural concrete blocks) Decorative concrete balustrades Concrete pavers of all shapes and sizes Masonry mortars Plaster finishes (stucco/cement plaster) It provides any project with a long-lasting visual impression. Many pleasing decorative effects can be achieved with colored concrete. Colored concrete allows the architect, the owner, and a builder many opportunities to express individuality and style.
		Packaging:
		Standard Packaged in cardboard boxes: 3-lb, 5-lb, 25-lb increments and 50-lb bags. Clean Color Lambco Color is also available in "Clean Color" packaging in 1/2-yard and 1-yard increments. These packages eliminate the need to weigh out pigment at the batch plant. Each package is deposited directly into the mixing truck at the batch plant; no mess or clean up.  Paper package will disintegrate during the charging cycle in the mixer.   (sample shown on white cement color page)
		Design Considerations:  Concrete made with gray cement is darker than concrete made with white cement. Using white cement will greatly enhance color intensity, but will also significantly impact concrete cost.
		Key Factor:  In pigmented concrete, consistency from batch to batch is of primary concern. To achieve best application possible, there needs to be consistency in each of the following: Pigment/cement proportions (measures by weight; not volume) Material sources Water/cement ratio Substrate density and absorption rate Slab or precast element thickness Mixing time with other ingredients Finishing procedures and practices Curing practices
		Samples: Cast samples of size suitable to demonstrate proposed surface finish, texture, and color. Use the same cement brand, aggregate type and finishing methods that will be used on the job. Produce samples under weather conditions that will approximate actual conditions, including shading, weather conditions, temperature, time of day, finishes, tools, curing practices, and so on.
		Mix Ratios: This color chart indicates ranges of color achieved by varying amounts of pigment. The quantity of pigment used can vary from 1% to 10% of the total cement content without affecting the compressive strength of the concrete. Gray cement influences the final appearance of color differently than white cement and this is depicted on the color chart by the gray background or white background. The color intensity changes dramatically in the lower range (from 1-lb to 5-lbs) but changes less in the high dosage range (above 5-lbs). The quantity of pigment is often stated in "pounds per bag of cement", but can also be expressed as a percentage of cement content.  To estimate the quantity of pigment required for each yard of concrete, multiply the dosage rate and the number of bags of cement. For example, in a typical 5-bag mix design using gray cement to match the 3-lb Brite Red chip on the color chart means 15-lbs of color per yard of concrete: (5-bags x 3-lbs = 15-lbs). This is roughly the same as 3% Brite Red. Try our online color calculation form.  Just answer three questions, we calculate for you!
		Color Mixing: Add precisely weighed quantity of Lambco Color or drop "Clean Color package" directly into a ready-mix truck that contains some of the aggregate and mixing water.  Allow mixer to rotate several times or 2-to-5 minutes to break bags and disperse pigment.  Then add remaining aggregate and cement as remaining aggregate and cement as required and mix at charging speed. Maintain 4" to 5" slump.  Check and verify that water content is exactly the same for multiple batches in continuously poured areas.  Closely monitor addition of raw materials and additives, verifying batch consistency from first load to last load.
		Limitations:  Uniformity of color is more difficult to achieve in concrete surfaces with smooth and super flat finishes. A white mineral deposit on the surface of concrete, called efflorescence, is sometimes mistakenly attributed to pigment. Pigments contain no foreign materials to cause efflorescence. To reduce the occurrence of efflorescence, use clean water, use the smallest practical quantity of mixing water and use clean, washed aggregate. Also, tamp concrete well to ensure complete and tight consolidation. Usually the white deposits on pigmented concrete are calcium carbonate build-up which are formed because of a reaction between carbon dioxide in the air and free lime in the cement. Calcium carbonate deposits can be removed with a diluted muriatic acid wash, but can be prevented by production of low absorption, watertight concrete. Cautions: With the exception of Deep Black, Lambco Color pigment are light-fast and UV-stable. Deep Black pigment can exhibit surface color erosion in concrete exposed to intermittent wetting and drying if not properly sealed using Colorgard in a matching color. Deep Black is not recommended for use in air-entrained concrete.
		Consumer Advice & Quality:  Check with your ready-mix supplier or building materials dealer for referrals to contractors that specialize in colored concrete work in your area.  Lambert Corporation does not certify applicators and is not affliated to any contractors.  Choose a licensed and qualified concrete finishing contractor that can provide a list of similar projects that can be reasearched or inspected prior to selecting.
		Shake Applications: A dust-on, shake-on or dry-shake application of Lambco Color is not recommended.  Lambert Corporation suggests using Colorhard or Colorbrite for that type of application.
		Admixtures: When using Lambco Color, additional admixtures should not be used. If they are used, please make test batches for compatibility comparison.
		Curing: If weather conditions permit, avoid using a curing compound. If a clear sealer is desired, use UV Super Seal or UV Safe Seal. Where color uniformity is paramount, use Colorgard. Contact a Lambert Representative for recommendations on curing pigmented concrete.