Abstract
High-performance concrete (HPC) is one of the most recent types of concrete among the materials used routinely in building and civil structures. Their development in structures applications and the growing need for the justification of their fire resistance has led several laboratories to carry out research on their properties at high temperature. This letter presents some main aspects related to their physicochemical changes, thermal properties and mechanical properties at high temperature. It introduces a State of The Art prepared by the RILEM Technical Committee 227-HPB (Physical properties and behaviour of High-Performance Concrete at high temperature) and untitled “Behaviour of High-Performance Concrete at high temperatures”. This State of the Art will be publish in a next future.
Highlights
At the end of the 1990s, the development of High‐performance concrete (HPC) and other new types of concrete (Self Compacting Concrete, Ultra High Fibre Reinforced Concrete ...) led researchers to carry out new research programs in order to determine the properties of these new concretes at high temperature
Due to the fundamental differences from ordinary concretes, HPCs can have a specific behaviour at high temperature, which is important to know for fire safety verification of structures
Water in cement paste plays a substantial role in the development of transient thermal strains
Summary
At the end of the 1990s, the development of HPC and other new types of concrete (Self Compacting Concrete, Ultra High Fibre Reinforced Concrete ...) led researchers to carry out new research programs in order to determine the properties of these new concretes at high temperature. Of particular note are the works conducted and synthesised in the context of the European project HITECO [1] and the French National Project BHP 2000 [2, 3]. The use of this type of concrete (usually defined as having a compressive strength higher than 60 MPa) is often motivated by a high durability that gives to structures a longer life time compared to the use of ordinary concretes. Heat and mass transfer properties, as well as mechanical properties are essential to know These properties are sometimes useful as input to simulation models, and may come in addition to codes like the Eurocode 2 for example. The analysis of properties changes with temperature allows better understanding of the behaviour of HPC under fire and allows anticipation of the behaviour of a structure
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