Behaviour of self compacting concrete mixed with different additions at high-temperature

The development of self-compacting concrete (scc) has recently been one of the most important developments in building industry. scc offers several advantages in technical,economical and environmental terms. scc demands a large amount of powder content compared to conventional vibrated concrete (vc) to produce a homogeneous and cohesive mix. a large number of papers dealing with the subject has been published but very little has been done on scc incorporating mineral admixtures,at high temperature. to this end,three groups of concrete were selected and analysed. the first group was a non-pozzolanic filler (limestone powder) while the second group was a pozzolanic filler (ground granulated blast-furnace slag) to be compared with the third group of vibrated concrete. mechanical and physical properties were studied before and after heating. compressive strength,flexural tensile strength,dynamic elastic modulus,mass loss,porosity,image analysis,air permeability and water penetration were studied. specimens were subjected to various heating temperatures (20°c,105°c,250 °c,400°c,600°c and 800 °c) with a heating rate of 1°c/min. a stability phase varying from one hour to two hours (600°c and 800°c),was applied in order to spread the temperature all over the specimens,then a cooling phase until ambient temperature. the results indicated similar material behaviour of scc and vc at high temperature when spalling did not occur. © 2017,university of mohammed premier oujda morocco.