Because of this, the mixing time for producing SCC lies in the range of standard vibrated concrete. Productivity can be increased considerably by significantly reducing mixing time, eventually reducing production costs.

In addition, SCC could be produced in a total mixing time of 60 seconds by using hybrid mixing sequences. Separating the mixing process into an intensive mixing phase in the plant mixer and following homogenizing in the ready-mix truck is conceivable for the production of ready mixed concrete. Thus, reducing effective mixing times in the plant mixer down to 30 seconds can be achieved by changing tool velocities.

This entire paper is included in the SCC 2005 Proceedings, published by the Center for Advanced Cement-Based Materials. The two-volume collection contains more than 170 articles in 10 themes: Case Studies and Applications; Chemical Admixtures; Durability; Fiber Reinforced SCC; Fresh State Properties; Mechanical Properties and Performance; Mix Design; Powdered Materials and Aggregates; Structural Performance; and Test Methods and Processing.

The proceedings are available through ACBM for $120, plus shipping and handling. To order, visitwww.acbm.info, or telephone 847-491-3858.

For More Information...

If you are interested in learning more on SCC research, consider attending the 5th International RILEM Symposium on Self-compacting Concrete. Organized by the faculty at Magnel Laboratory for Concrete Research at Ghent University in Belgium, the conference takes place Sept. 3–7, 2007. To learn more, contact Professor G. De Schuttert at Labo.Magnel@UGent.be, or fax 32 9 264 58 45.