High performance concretes (HPC) have been developed extensively in the past few years. The behaviour of these concretes at high temperatures has not been investigated adequately. This project -HITECO- is devoted to the study of the behaviour of HPC and ultra-high performance concrete (UHPC) in high temperature environments and to the development of specific software allowing the design of structures and the prediction of spalling in such environments.
Tests performed for the first time: (e.g. direct tensile stress-strain and strength at high temperatures, gamma-ray spectrometry).
Development of innovative fully-coupled thermal-hygral-mechanical software which connects the micro-structural properties of concretes and their macro behaviour at high temperatures.
BE95-1158 Understanding and Industrial Applications of High Performance concretes in High Temperature
High performance concrete (HPC) has been extensively developed in the past few years. It is being used in an increasingly wide range of industrial applications. Stronger concretes, called Ultra High Performance Concretes (UHPCs) were developed recently.
Because of their fine pore structure, exposure to high temperature of HPCs and UHPCs may lead to serious deterioration and spalling of these concretes. Despite these serious uncertainties, and the increasing use of UHPCs in many industrial applications, the temperature behaviour of these concretes have not been adequately investigated and the processes involved are not fully understood.
It is proposed in this project, after a selection of materials fitted to high temperature study to characterize thoroughly the mechanical, thermal and microstructural behaviour of 8 kinds of HPCs and UHPCs. Microstructural analysis will include pore size distribution, permeability, TG, DTG, DTA and XRD. Thermo-mechanical properties will include thermal transient creep.
These results will permit the development of a structural software package, including heat and mass transfer, that will connect the micro and meso properties of HPCs and UHPCs to their behaviour in high temperature environments. A second sofhtware starting from macro scale properties (behaviour law) and deriving thermal mechanical coupling will be extended to HPCs and UHPCs.
The results will be validated by experimental testing on industrial scale pieces and structures. ISO Fire, Hydrocarbon fire, Jet fire, long term exposure to elevated temperatures will all be investigated.
The main deliverables of the project are:
- The software that will be available for commercial use.
- Basis for design against fire by identification of key parameters concerning mechanical behaviour and spalling of HPCs and UHPCs under high temperature environment.
-Prenormative recommendations for the introduction of HPCs into national code
The consortium comprises a major contractor (Bouygues) that will produce and characterize UHPC and develop one of the software, a cement producer (Aalborg Portland) that will also produce UHPCs. A major recast industrialist (Partek) as an end user, two software developers (ENEA, Padova). A Fire testing laboratory (VE ), a University specialized in thermal-mechanical testing (Imperial College) and a research centre specialized in concrete microstructural analysis (CSIC) are the other members of the consortium.
Funding SchemeCSC - Cost-sharing contracts
00060 Roma - Santa Maria Di Galeria
SW7 2BU London