Hardeners and Densifiers

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World of Concrete 2010

Everything you need to know about the most important industry event. More

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2009's MIPs

The industry's new products, launches, and technologies will be at World of Concrete. More

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Readers' Choice

We present the most popular products from the past year. More

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Modern Moisture Testing

Changes have occurred in testing floor dryness. More

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Measuring Compressive Strength

Compressive strength is one of the most important measurements in manufacturing concrete. As a producer, I need to know whether this measurement is accurate. How can I be sure my concrete compressive strength results are correct? More

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Lightening Hardened Concrete

We’ve been asked to bid on an upcoming concrete bridge deck. The project requires a hardened concrete that will resist corrosion. Normally on jobs like this we recommend micro-silica. But in this case, there’s a catch. The bridge is part of a high-profile project that features decorative concrete sidewalks and architectural precast panels. The designer wants a brighter surface on the bridge deck. Is there a way to lighten the concrete? More

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Compressive vs. Flexural Strength

Is there a good way to correlate core compressive strength and flexural strength? I have a job in which there was only one beam broken, at 28 days, and there are not enough sets to perform any statistical analysis. We are planning to core the pavement and are looking for a comparison between the two. More

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Rain's Effect on Fresh Concrete

About 3 hours after our contractors poured a concrete patio, it began to rain and continued to rain for 2 hours. How will that compromise the integrity of the concrete with respect to strength, durability, and so on over the long term? More

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Lower Strength with Fibers?

A participant in Aggregate Research IndustriesÆ Industry Forum (www.aggregateresearch.com/forum) recently posted an interesting question that has challenged our industry since fibers were introduced. The participant started by stating that heÆs noticed a disturbing trend in a recently prepared set of field cylinders. Samples batched with synthetic reinforcing fibers on one project were breaking at lower compressive strengths than mixes with comparable designs but that used different types of fibers. He said that he suspected that the contractor had authorized water additions, but field records did not support this. He than asked, ôDo you know any reasons why these strength results would be lower if fibers were used in comparable mixes?ö More

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Algae in Mix Water Can Affect Air, Strength

We recently supplied a house slab where the bleedwater had a greenish tint. We discovered that the water retention pond we used for water collection had green algae that had formed on the surface and was used for concrete production. The concrete met and gained strength normally, however. Is there anything we should be concerned about? More

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