The Lovettsville, Va.-based Silica Fume Association has created a free CD that contains technical articles for infrastructure professionals detailing how to produce crack-free concrete structures. The articles explain typical types of cracking that are found in all concrete and the factors that can increase the likelihood of cracking in concrete. The CD also contains two instructional videos on finishing and curing silica-fume concrete. To obtain a copy of the CD, call (540) 882-4001 or visit www.silicafume.org.