We have our plants inspected and certified in accordance with the checklist in Section 3 of the National Ready Mixed Concrete Association's Quality Control Manual. This certification includes truck mixer inspection to ensure that there's no appreciable accumulation of hardened concrete in the drum...
When making exposed-aggregate architectural precast channel column covers, we've noticed that after abrasive blasting, the texture on the down face differs from that on the vertical face. What causes this, and what can be done to correct it?
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