EFFECT OF MAXIMUM AGGREGATE SIZE ON PLASTIC VISCOSITY　OF FIBER REINFORCED SELF-COMPACTING CONCRETE

摘要

Casting concrete segments with fiber reinforced self-compacting concrete (FR-SCC) can ease the production process. Thus one is able to cast concrete elements without placing reinforcement bars in the mould or vibrating the concrete. Until now, the use of structural steel fibers has been limited, even though it could have been beneficial. One of the main reasons is the relatively poor workability of concrete reinforced with steel fibers. This has led to a market trend of trying to avoid the use of structural steel fibers, even when needed. One of the advantage of plastic structural fibers in concrete is their flexibility, so as they do not act so negatively on the workability of the fresh concrete.rnThe research results are based on paste, mortar and concrete tests, in which the consistency was tested with a coaxial cylindrical viscometer. The primary aim was to evaluate the effect of maximum particle size on the plastic viscosity (in mixes without or with silica fume) while the yield values were held constant around 70 Pa by use of dispersing admixture. The fiber content in the mixes varied in steps from 0 through 0,25 to 0,50% by volume of the concrete.