Precast concrete panels often are used in conjunction with architectural cast-in-place concrete. Matching these finishes to create a monolithic look must be planned before construction starts to adjust mix design, placement technique, methods of consolidation and finishing procedures. Samples and full-scale mockups should be prepared for both the precast and cast-in-place panels and differences resolved prior to finalizing either finish.

When both products will be used in the same plane, the cast-in-place tolerances must be strictly enforced. Differences in curing methods between the two techniques, even with identical mixes, may cause color variation in the finish, particularly if the precast concrete uses accelerated high-temperature curing. Different weathering patterns may ultimately result in dissimilar appearances due to different concrete densities.

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