EXPANSION OF EXPANSIVE CONCRETE MEMBERS REINFORCED WITH STEEL FIBER

This paper presents the effect of steel fiber on the uniaxially restrained expansive strain of the expansive concrete member. Test specimens consisted of; an A type uniaxially restrained specimen with restraint ratio of about 1% (JIS A 6202); a mortar type uniaxially restrained specimen with restraint ratio of about 0.1%; and reinforced concrete beams. The unit content of expansive admixture was changed up to 70kg/m3 and the water-binder ratio was either 40%, 50% or 60%. Uniaxially restrained expansive strains were decreased by using steel fibers showing that not only reinforcing bars and steel reinforcements restrained the expansion of the expansive concrete member. The degree of reduction of expansive strain can be estimated by the proposing method based on the concept of work done by expansive concrete on restraint.