Durability Properties of High Volume Fly Ash Self-compacting Fiber Reinforced Concretes

The paper shows the possibility of obtaining self compacting concrete containing a large number of additional cementing materials, including fly ash. The research results of rheological properties of self compacting fiber reinforcedconcrete mixes with high volume fly ash and additives regulating viscosity and fluidity of concrete mixes were shown. It was found that the replacement of 55, 70 and 85 mass.% binder fly ash allows to obtain self compacting concrete mixes with a class for slump flow SF2, viscosity T500 = 5 s and air entraining 0.4%. It is shown that replacing 55 mass. % fly ash cement making and administration of 0.5 % basalt fiber allows a self compacting concrete strength of 41.8 MPa after 28 days of curing in normal conditions, and concrete containing 85 mass. % fly ash as part of a binder is characterized by strength of 25.4 MPa. The results showed a positive effect of basalt on high volume fly ash self compacting fiber reinforced concrete, including increased strength, reduced relative strain at constant stress, increased strength and reduced prism Poisson's ratio. Self compacting concrete technology allows Faster and safer shape construction projects compared with the use of conventional concrete properties