We are seeing more news surrounding one of the more exciting innovations in the concrete industry: roller-compacted concrete (RCC).
As evidence, ASTM International is formalizing a method for making a cylindrical specimen of RCC in a gyratory compactor. Test Method for Preparation, Compaction and Density Determination of Roller-Compacted Concrete Specimens by means of the Superpave Gyratory Compactor is being developed by Subcommittee C09.45 on Roller-Compacted Concrete. This is part of ASTM Committee C09 on Concrete and Concrete Aggregates.
Superpave gyratory compactor, developed about 20 years ago, mimics the kneading compaction mechanism that takes place during field compaction.
“The superpave gyratory compactor represented a major shift in the way that asphalt mixtures were designed,” says Stacy Williams of the Center for Training Transportation Professionals and a member of C09. “We are always looking for ways to get better correlations between field and laboratory material properties in order to close the gap between the design and production phases of construction.
“Since RCC pavements are compacted just like asphalt pavements, it seems reasonable that a laboratory-scale compactor designed to imitate field roller compaction would also be appropriate for RCC.”
Also, TCP recognized Jerry Larson, executive director of the Indiana Ready Mixed Concrete Association, as a 2011 Industry Influencer for his role in promoting RCC in Indiana. Click here to read the article.