Moisture Barriers

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Air Barrier Live at World of Concrete

A review of one of World of Concrete's newest live events, Air Barrier Live. More

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Waterproofing Bloomberg After Hurricane Sandy

After the mechanical room at Bloomberg's Manhattan office received 2.5 feet of... More

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Solving Concrete Finishing Problems

Two factors impact the ability to finish concrete. The first is available paste in... More

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Sustainable Waterproofing Mix

Krystol Internal Membrane (KIM) concrete waterproofing admixture is an... More

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Modern Moisture Testing

Changes have occurred in testing floor dryness. More

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Correcting for Aggregate Moisture

Q: I'm fairly new in the concrete business and I know that a mix's water-cement... More

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The Value of Value-added Products

Two producers make value-added products a key part of their business plans. More

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MCPX Around the Corner

The show will be in Orlando, Feb. 22-24. More

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Is it the Slab's Fault?

A flooring contractor has experienced problems on four occasions over the years with his two-part polyurethane floor covering not bonding to our concrete slab-on-grade. He has said that the acid-etch process prior to installing the covering did not react very well with our slab surface, based on his observation of the amount of bubbling. He also reports a strong ammonia smell emitted from our concrete as well as a darker appearance of the concrete throughout the depth of the slab. The flooring contractor did not run vapor emission tests on any of these jobs. He was confident he had waited long enough for vapor emission to not be a problem. As the concrete supplier, I am convinced that unless you run vapor emission tests that indicate the emission is below the maximum limit for his product, you are asking for bonding problems. Supposedly the general contractor installed a vapor barrier for the slab-on-grade. The flooring contractor does not believe a hydrostatic head exists under the slab. Water was present in the failed areas. The flooring contractor is convinced that something in our concrete caused his problems. Are you aware of any other factors that we need to investigate related to this type problem? More

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Hitting Paydirt When There's Poor Dirt
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