| Abstrakt: |
In most of the European countries, outdoor concrete structures are being heavily loaded by temperature changes during the year. There are very high temperatures in summer and low temperatures in winter, usually accompanied by ice formation. That is a reason, why it is so important to estimate, how concrete structures behave when they are exposed to water in cold temperatures and to a chemical substances used for ice defrosting. The way how to find out desired parameters is by accelerated test programs or by application long-term experimental studies and structure monitoring. Chloride penetration tests are standardized accelerated tests, where concrete sample is submersed into saline solution and is cyclically freeze and thawed, when deteriorated concrete surface is monitored through resulting scaling. However, the ingress of saline solution is highly dependent on the transport properties of concrete surface. Present work introduces results of long term experimental program, which was focused on the relationship of surface water absorption and concrete surface scaling. These type of tests are very important for diagnosis management of existing concrete structures. It was concluded, that there is no reliable relation valid for large set of various concrete mixtures, however for particular mixture with variable water to cement ratio, it offers good fit. [ABSTRACT FROM AUTHOR] |
