This paper deals with the development of engineering database
on the changes in the mechanical properties of high performance
concretes mixtures when exposed to high temperature up to
850oC. The results of an experimental investigation into the
e
ffects of high temperature on the residual compressive strengths
for high performance concretes made with ordinary Portland
cement are presented.
There are various types of industrial fibers such as: (polypropylene fiber, fiberglass, silica fume powder, etc..). These fibers are used widely as additives for improving concrete strength. We study in our research the effect of each of polypropylen
e fibers, steel fibers, and silica fume powder, on two kinds of concrete mix the first ordinary mix and the second is mix other with Mazar sand. We found after the studying of mechanical properties for those mixes that a slight improvement on tensile strength of concrete has
occurred, an increasing of compression strength of concrete has happened, and the failure style has changed according to the type of additive compared with concrete without additive.
