1 . - 159 - LONG-TERM DURABILITY OF CONCRETE Thorkild H. Rasmussen, B.Sc., Aalborg Port- land, Denmark ABSTRACT The objective of the present project is to investigate the long-term durability charac- teristics of various types of concrete expo- sed to various environments. The project is carried out as a semi-full scaje project with a total concrete volume of 2 m for each of the 16 different types of concrete. The activities with respect to th~ full-scale specimens include destructive as well as non- destructive testing. In addition to the larger specimens a number of laboratory specimens were cast in order to provide initial data on the quality of the concrete. INTRODUCTION The project "Long-term Durability of Concrete" described in the present paper is sponsored by Danalith A/S, Færdigbeton Aalborg A/S, F. L. Smidth & Co. A/S, KH Beton A/S and Aalborg Portland. These compan~es togetherrepresent vital parts in the produc- tion of concrete, e.g. the cement producer, the ready-mixed concrete producer and the contractor. The aim of the project is to evaluate the long-terrn durability of various types of concrete exposed to various realistic con- ditions. The project should be seen in the light of the evolu- tion during the last decade with respect to modern concrete technology. The use of mineral additions plays an important part in most countries today, and in Denmark pulverized fuel ash (flyash) and microsilica are used to an inc;easing extent. Flyash has been used for many years in other parts of the world and also microsilica has been used for several years, primarily in Norway. Wide experience in the use of these materials, therefore, al- ready exists. However, practical experience often suffer from the lack of sufficient documentation and proper references whi- le, on the other hand, laboratory experiences traditionally are based on idealized conditions with very little similarity to reality. The present project makes it possible to follow the general conditions of a number of concrete specimens which in contrast to most laboratory experiments are produced in large scale and exposed to realistic conditions, and which in contrast to most practical experience are very w~ll documented.
LONG-TERM DURABILITY OF CONCRETE
Apr 29, 2023
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