ACI SP-114

Abstract

INTRODUCTION <br>In 1983, at the First International Symposium on Fly Ash, Silica Fume, and Slag, the author presented a comprehensive report on pozzolanic and cementitious by-products used in concrete (1). During the last five years a relatively large number of publications dealing with the subject have appeared. For example, the proceedings of the Second Int'l Conference on Fly Ash, Slag, Silica Fume, and Natural Pozzolans (Madrid, 1986) contain 80 papers in a Special Publication of the ACT (SP-91), and the proceedings of the Eighth Int'l Congress on the Chemistry of Cements (Rio de Janeiro, 1986) contains 4 special reports and 43 supplementary reports on the subject. In addition to numerous research papers that are routinely published in scientific and technical journals, the author is aware of at least five books (2-5) and four committee reports (7-10) which attempt to cover the state of the art in a comprehensive manner. <br>This review is not intended to be a digest of the 1983-87 publications on pozzolanic and cementitious by-products used in concrete. Instead, it is the intention of the author to provide an update on the topics covered by the previous review (1) and highlight any new information which, in the author's view, represents a significant advancement to the state of the art. <br>First, a brief review of the more recent rates of production and utilization of pozzolanic and cementitious by-products in many countries of the world will be presented. This will be followed by new and useful information on their physical and chemical characteristics, influence on concrete properties, specifications and test methods, and contribution of siliceous by-products in making concrete an environment-friendly material of construction.