Study on compressive strength behaviour of normal concrete and self-compacting concrete subjected to elevated temperatures

摘要

Self-compacting concrete (SCC) is a form of high-performance concrete that flows and fills the form without segregation. This paper presents the behaviour of concrete when it is subjected to elevated temperatures. The investigation reports the loss in compressive strength and risk of spalling of SCC. The effects of elevated temperature on the properties of normal concrete (NC) and SCC are summarised. The compressive strength of NC and SCC was determined at different temperatures, thus providing scope of determining loss/gain in strength. In addition, modes of cooling and variation in different grades of concrete were studied. Non-destructive testing using a rebound hammer was also conducted to study the changes in surface hardness of concrete specimens subjected to elevated temperatures. The test results indicate that SCC is more sensitive to elevated temperatures, compared to NC.