Influence of Minimum Temperatures on the Scaling Resistance of Concrete. Part 1.Portland Cement Concrete

摘要

In the project, the influence of the minimum temperature of the freeze-thaw cycleon the scaling resistance of concrete was investigated. The tests were performed according to SS 13 72 44, often called the Scandinavian slab method, and minimum temperatures between -12 and -27C were studied. All the tests were performed on Portland cement concrete qualities. Three concrete qualities were used. These can be classified as having poor, acceptable and good scaling resistance respectively. Specimens were preconditioned in two different ways, some specimens were allowed to dry for seven days before the start of the test while others were kept in plastic bags until the start of testing. Sawn surfaces were used for most of the specimens, but for some the test surface was cast against the inside of steel molds. A new preconditioning method can only be used if it leads to results that rate concrete in correct order according to the performance of real outdoor concrete in the same way as when the standard preconditioning procedure is used, as the latter has been proven suitable and is based on long experience.