Influence of cosistency, air entraining agent and moist curing period on salt-frost scaling resistance of concrete with higher content of limestone filer

摘要

The aim of the diploma work was to examine resistance of self-compacting and control vibrated concrete to the salt frost scaling. Self-compacting concrete (SCC) contained limestone powder as additional fine material. The highest number of experimental tests was made on aerated SCC mixtures with air content of 8%. Control concrete mixtures were non- aerated SCC, aerated vibrated concretes, with and without additional limestone powder, as well as non-aerated vibrated concretes, also with and without additional limestone powder. In the diploma work influence of cold wet curing (1, 3, 7, or 28 days, temperature of water 15 o C) on the salt frost scaling of concrete mixtures under consideration was studied. Properties of fresh SCC mixes were estimated by using slump-flow and V-funnel test, and properties of fresh vibrated concrete mixes by using slump and flow tests. On hardened concrete mixes compressive test and measurement of the travel time of a pulse of longitudinal ultrasonic waves passing through the standard concrete cubes were carried out, beside the salt-frost scaling test.