Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.
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28 • January 2015 www.concreteproducts.com The eighth edition of ACI SP-4(14) Formwork for Concrete Manual includes current standards and practice, removes prior versions' outdated or irrelevant material, and adds content on new devel- opments in formwork technology and methods. SP-4(14) is authored by ACI Technical Committee 347, Form- work for Concrete member David Johnston, Edward I. Weisiger Distinguished Professor Emeritus at North Carolina State Univer- sity. He led committee efforts to update the manual, including revisions to align it with Guide to Formwork for Concrete (ACI 347R-14), which is reprinted in full in the appendix. The eighth edition is the first to be printed completely in col- or, with nearly 500 photos and 150 illustrations. Span tables and design values have been updated to comply with the 2012 National Design Specification issued by the American Wood Council, and loads have been updated to reflect changes in the latest edition of ASCE/ SEI 37, "Design Loads on Structures During Construction." New formwork examples include the use of allowable stress design, as well as load and resistance factor design. Chapter problems have also been included for the first time to make the document easier to use as a teaching tool, while still maintaining its status as a reference for practicing engineers. "The eighth edition marks the 50th year in print of this iconic manual," says Professor Johnston. "Revising and bringing one of ACI's best-selling documents up to date included reference to the latest design and construction standards for guidance of the formwork designer and contractor. Expanded coverage of design methods, products, and both revised and new worked examples, will ensure that Formwork for Concrete will continue to be the most respected reference in the concrete formwork industry and an excellent teaching resource in the classrooms." — ACI Bookstore, 248/848-3800; www.concrete.org NEWS SCOPE PRACTICE American Concrete Institute revises formwork benchmark STANDARD MODELS SLAB MIXES' DRYING BEHAVIOR Newly published ASTM C1792, Test Method for Measurement of Mass Loss Versus Time for One-Dimensional Drying of Saturated Concretes will enable engineers and producers to charac- terize how hardened mixtures dry. "The informa- tion can be used to directly assess the drying rates of a given concrete mixture," says ASTM member Dale Bentz, chemical engineer for the Materials and Structural Systems Division in the National Institute for Standards and Technology Engineering Laboratory. "[It] could be valuable for industrial flooring applications, for example, where quick drying is often desirable." In many applications, concrete is exposed to wetting and drying conditions in such a way that the slab or structure is partially saturated. The C1792 test will provide information on the mass loss versus time (drying) behavior of an initially saturated concrete specimen exposed to one-dimensional drying in a controlled tem- perature and relative humidity environment. Subcommittee C09.66 on Concrete's Resis- tance to Fluid Penetration, part of ASTM Com- mittee C09 on Concrete and Concrete Aggre- gates, developed ASTM C1792. Contacts: tech- nical, Dale Bentz, NIST, 301/975-5865, dale. bentz@nist.gov; staff liaison, Scott Orthey, 610/832-9730; sorthey@astm.org. TEST SUITS SLABS SET FOR FLOORCOVERINGS A proposed ASTM International standard, WK47030, Practice for Evaluating Concrete Floor Systems to Receive Resilient Flooring, follows World Floor Covering Association and Floor Covering Installation Contractors Association endorsement of dryness testing and slab evalu- ation by third parties. Once approved, WK47030 can be specified in construction documents or contacts as a way to require such oversight. The proposed standard addresses evaluation of a concrete slab system that is intended to be covered with resilient flooring. It features a review of concrete floor slab design and con- struction documents to ensure compatibility with specified floor covering and adhesive man- ufacturer requirements. "The ultimate intent of WK47030 is that someone, regardless of where they are in design or construction, can have all pertinent data and documents in a comprehensive document that notes any and all discrepancies or conflicts between what the concrete contractor has been assigned to do versus the needs of a floor cover- ing system," says ASTM Committee F06 on Resil- ient Floor Coverings member George Donnelly, who heads an eponymous testing and inspec- tion service. ASTM WK47030 is being developed by Sub- committee F06.40 on Practices. Contacts: tech- nical, George Donnelly, 501/915-0626, info@ moisturetesting.com; staff liaison, Stephen Mawn, 610/832-9726; smawn@astm.org.