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SCC real-life operations were discussed at the SCC 2008 conference.

A key outcome of their work was evidence that temperature represents a key source of variation of SCC properties. “Its importance cannot be minimized,” the researchers stressed. SCC batched with the same ingredients and proportions reacted differently at different temperatures. SCC had a better rheological response (described as self-compactability) at intermediate temperatures (around 20° C) than in mixes at extreme temperatures (near 10 or 40° C).

Considering the observed variations with time, changes along the first hour are more significant in the case of yield stress than for plastic viscosity, and in the case of the slump-flow than for the V-funnel time.

Interestingly, the researchers found that periodic remixing during waiting seems to affect self-compactability negatively. The additional action produces a higher yield strength, lower spread, and longer flow-out period regarding mixes kept stationary.

More than 130 papers were accepted for presentation at SCC 2008. The papers are listed on the the Center for Advanced Cement-Based Materials' Web site at www.acbm.info under the events tab. To learn how you can buy a copy of the proceedings, e-mail acbm@northwestern.edu.

The Next SCC Opportunity

Interest in SCC continues to grow. Thus, the Research Group on Cement and Concrete at the Université de Sherbrooke is hosting the combined Fourth North American Conference on the Design and Use of Self-Consolidating Concrete and the Sixth International RILEM Symposium on Self-Compacting Concrete, otherwise referred to as SCC 2010.

The conference takes place Sept. 26-29, 2010, at the Centre Sheraton Montreal Hotel. In addition to the practitioners' track, organizers expect more than 75 presentations from leaders in the cement and concrete field representing industry, academia, and government agencies.

The goals of the conference are to raise awareness of the diverse issues hindering the acceptance and utilization of SCC in the field, to transfer knowledge to participants so they can be better-equipped to overcome those barriers, and to promote a greater interaction between North American researchers and international users of SCC.

Kamal Henri Khayat is the symposium's chair. To learn more, visit the SCC 2010 Web site at www.civil.usherbrooke.ca/SCC2010.