The Influence of Composition and Compaction on the Properties of Roller Compactcd Concrete

In many countries rullw cumpactod concrete (RCC) proved to be a success as a construction method for highly stressed industrial floors, for concrete pavements, subbases for concrete pavements and asphalt surfaces. Since 1993 the Research, Development and Consulting Department of tho Heidelberger Zement AG is attended with a research project financed by the Federal Department of Transport (Bundesministerium für Verkehr, BMV) in order to synchronize this construction method in the concrete-technological respect with the special weather and stress conditions in Germany, to "pave" the way for the general application of RCC in road construction. In this research project, special attention was payed, among others, to the influence of minor compactions on stability, the resistance to frost and frost-deicing salt, the influence of additives on the workability, dliii the durability of RCC as well as to the requirements of filler materials like e.g. fly ash. Prevailing results prove do, that minor compactions lead to a significantly reduced compressive strength, whereas the cement coiiterit has only little impact on the compressive strength, if the content of ultra-fine aggregate particles is sufficient. The research project is accompanied by a trial seetiuru.