Here's a selection of relevant articles about concrete properties from AEC companies and organizations, including The Schundler Company, Ventura Cast Stone.
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SCHUNDLER COMPANY-Transit Mix Perlite Concrete
...by similar methods as sand-gravel concrete, there are some considerations that must be given to the order of addition of materials and to the time of mixing to assure correct concrete properties and adequate yield. The following mixing information for transit mixing is presented as a guide to the manufacturer to eliminate some of he questions... See #1.
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Cast Stone Colors
Generally, the amount of pigments used in concrete should not exceed 10% by mass of the cement. Pigments used in amounts less than 6% generally do not affect concrete properties. Unmodified carbon black substantially reduces air content. Most carbon black for coloring concrete contains an admixture to offset the effect on air. See #2.
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