93 Properties of concretes mixed with Pulverized Fly Ash Anders Lindvall M.Sc., Ph.D. Thomas Concrete Group Ringögatan 14, SE 417 07 Göteborg E-mail: anders.lindvall@tcg.nu Oskar Esping & Ingemar Löfgren M.Sc., Ph.D. Thomas Concrete Group Ringögatan 14, SE 417 07 Göteborg E-mail: oskar.esping@tcg.nu & ingemar.lofgren@tcg.nu Tang Luping Professor Chalmers University of Technology Div. of Building Technology, SE 412 96 Göteborg E-mail: luping.tang@chalmers.se ABSTRACT In this paper two investigations made at the Central laboratory of Thomas Concrete Group where the properties of concretes mixed with combinations of fly ash and Portland cement are presented. Some of the results from these investigations are presented and discussed. Generally the results show that concrete with fly ash gets properties that are equivalent to comparable Portland cement concretes. The investigations show that the regulations in the standards EN 206-1 and SS 13 70 03 are in most situations reasonable, but in some situations too conservative. Key words: Pulverized fly ash, strength durability, frost attack, chloride ingress. 1. INTRODUCTION 1.1 General There is an increasing interest of using different types of industrial by-products, e.g. Pulverized Fly Ash (PFA) from coal fired power plants, to partly replace cement in the mixing of concrete. In this way the environmental impact, e.g. from CO 2 , as well as the production costs are reduced compared to Portland cement (CEM I) concretes. Moreover the performance of the fresh and