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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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One of our architectural precast customers wants to remove a thin skin from the surface of narrow bands on cladding panels. He wants a surface effect that's similar to that achieved by light abrasive blasting, but masking off the larger areas that won't lose the skin will be time-consuming. Is...
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We produce precast exposed-aggregate sandwich panels using concrete made with Type III cement, a 0.38 water-cementitious materials ratio and enough superplasticizer to achieve a 7- to 8-inch slump. The forming bed is made of wood. Using a bucket that passes down the center of the bed, we pour...
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What causes aggregate shadowing or mottling on the form side of precast concrete? How can you minimize it?
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What causes crazing on architectural precast products? Does it affect structural integrity, or is it just an aesthetic problem? How do you minimize it without sacrificing the 5000-psi compressive strength usually specified for architectural precast products?
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