Epoxy bars

The Concrete Reinforcing Steel Institute’s Epoxy Interest Group (EIG) is advancing the industry with the release of the “Guidelines for Inspection and Acceptance of Epoxy-Coated Reinforcing Steel at the Jobsite,” which includes tips on transport and handling, placement, and repair. Despite problems in the past, epoxy-coated steel has proven effective in reducing reinforcing steel corrosion in transportation structures. However, it must be handled with care to prevent coating damage. Use nylon slings for lifting; chairs and ties should be coated with epoxy or plastic. During concrete placement, use an S bend at the end of a pump hose to prevent the concrete from free-falling onto the epoxy-coated bars. These things go a long way toward protecting the coating and ultimately preventing corrosion. To get copies of this and other EIG guides, visit www.epoxyinterestgroup.org.

Waterproof paper

In the August issue of sister publication The Concrete Producer, Rick Yelton describes some all-weather notebooks available to contractors. The Rite in the Rain notebooks from J.L. Darling Corp., Tacoma, Wash., use patented waterproof paper. The waterproof paper is easy to write on and won’t smudge in wet conditions, especially when used with the company’s all-weather pens. Notebooks are available in various sizes. Learn more at http://go.hw.net/cc-no-smudges.

Limestone cement

Portland cement is the largest contributor to the carbon footprint of concrete. One way to reduce the amount of CO2, or make it greener, is to reduce the amount of portland cement. Lafarge mixes plain limestone into the grinding process at up to 15%, providing performance similar to conventional cement with up to 10% less emissions. Research shows this new portland-limestone cement (PLC) has the same workability, set time, and strength gain as normal concrete. Lafarge is introducing PLC across Canada (now approved by the Canadian Standards Association), which has been used in Europe for more than 25 years. ASTM specifications for blended cement in the U.S. also allow limestone additives but at much lower percentages—around 3%.

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