New ACI committee advances 3-D printing practice, standards

Sources: American Concrete Institute, Farmington Hills, Mich.; CP staff

The newly formed ACI Committee 564, 3-D Printing with Cementitious Materials will report on three-dimensional printing and additive manufacturing with inorganic cementitious materials, and develop publications on the technology’s applications, challenges and impacts. 

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New ASTM C09 guide gauges mix performance, material compatibility

Sources: ASTM International, West Conshohocken, Pa.; CP staff

ASTM Subcommittee C09.48 on Performance of Cementitious Materials and Admixture Combinations’ working document, WK40615 Guide for Comparing Performance of Concrete Materials Using Mortar Mixtures, standardizes longstanding material-performance investigation protocol.

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Research raises questions on minimum CM specs, supports paste-to-void ratio rationale

27 Slumpa 400

A recent report on results of concrete mixtures testing at National Ready Mixed Concrete Association’s College Park, Md., research laboratory underscores optimized cement paste volume and paste-to-void ratio as key factors behind fresh and hardened specimens’ improved performance characteristics.

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