PCA Names Sustainability Director and Proposes Use of Limestone

The Portland Cement Association (PCA) announced at Greenbuild the proposed allowance of up to 5% ground limestone in the portland cement standard ASTM C150, a change that would bring U.S. standards in line with those in Europe and Canada, where limestone has been used successfully for decades. If approved, the standards will allow a reduction in the use of raw materials and energy and a reduction in greenhouse gas emissions. PCA has also created a new position, director of sustainable development, and named David D. Shepherd, AIA to fill it. Shepherd, who joined PCA in 2000 as manager of residential technology, began his new post November 1. PCA is online at www.cement.org.