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Dowel bar standard advances pavement quality control measures

Source: ASTM International, West Conshohocken, Pa.

The forthcoming ASTM E3013, Test Method for Evaluating Concrete Pavement Dowel Bar Alignment Using Magnetic Pulse Induction, will reinforce quality control and quality assurance measures behind durable, smooth mainline highways and airport runways. New to North America, magnetic pulse induction a) measures steel dowel alignment in concrete pavement joints, where the bars transfer loads from one slab to the next; and, b) yields data with which agencies or owners can determine if the dowel installation meets project specs.

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Construction employment: Up in California, down in W.V., good overall

Source: Associated General Contractors of America, Washington, D.C.

Construction firms added jobs in 40 states and the District of Columbia between May 2014 and May 2015 and in 28 states and D.C. between April and May this year, according to an AGC analysis of Labor Department data.

Read more: Construction employment: Up in California, down in W.V., good overall

ASTM C94-15 spells new requirements for ready mixed concrete buyers

Sources: National Ready Mixed Concrete Association, Silver Spring, Md.; CP staff

Following June committee week in Anaheim, Calif., ASTM International Subcommittee C09-40 on Ready Mixed Concrete has issued a new C94, Standard Specification for Ready-Mixed Concrete. In contrast to the predecessor version, NRMCA Engineering staff notes, ASTM C94-15 places the onus on the customer to communicate all requirements for concrete from a project specification; sets mix air content at levels for moderate and severe exposure; directs the purchaser, when ordering ready mixed, to either state the required air content or indicate finished concrete exposure type; requires purchaser to indicate density when ordering heavy weight mixes, and clarifies terms for ordering lightweight aggregate by stating equilibrium density; and, contains appendix revisions advising on strength overdesign concepts.

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