The use of admixtures is commonplace in today's concrete mixes. Does the addition of the various admixtures increase or decrease the drying shrinkage of concrete? Does it affect shrinkage at all? These are the questions we asked two distinctly different members of the concrete industry: Ross Martin, vice president of engineering and technical services, Baker Concrete Construction Inc.; and William Phelan, senior vice president of marketing and technical services, the Euclid Chemical Company.