Abstract
Self-compacting concretes (SCC) were prepared with 10 mm and 16 mm coarse aggregate sizes and using limestone powder (LS) and fly ash (FA) as fine material. The amount of fines in concrete, where the amount of cement and the water / cement ratio were kept constant, was increased in 36 dm3 increments up to 108 dm3. The effect of the type and amount of fines and coarse aggregate size on flowing, passing, segregation and blocking properties of SCCs were examined. Experimental results indicated that slump flow increases with increasing fines content. Opposite to this, V-funnel times increased with increasing fines content, however, they were shorter for FA than those of LS, which can be attributed the balling and lubrication effect of the former and arching effect of the latter particles. For both fines, higher segregation was obtained for SCCs with 16 mm than those of 10 mm. The SCCs with low amount of fines displayed higher blocking step in general and FA-added concretes had higher segregation than those of LS. The difference in the behaviors of LS and UK added concretes is most probably due to the differences in the particle shape and surface properties.
Highlights
The innovation of self-compacting concrete (SCC) can be regarded as a revolution in concrete technology
Mueller and Wallevik (2009) measured the rheologic properties of SCCs by using a BML viscometer and found that, the plastic viscosity showed a slight change with an increase in maximum aggregate size, the yield stress increased significantly
The SCCs with fly ash (FA) and 10 mm aggregate size required the lowest SP/P ratios among the mixtures prepared in this study
Summary
The innovation of self-compacting concrete (SCC) can be regarded as a revolution in concrete technology. Mueller and Wallevik (2009) measured the rheologic properties of SCCs by using a BML viscometer and found that, the plastic viscosity showed a slight change with an increase in maximum aggregate size, the yield stress increased significantly. SCCs were designed by using F-type FA up to 15% cement replacement; higher slump-flow and lower T500 and V-funnel times than those of the concrete without FA were reported (Jalal et al 2013). It seems that the spherical shape of the FA particles gives more deformability to the SCCs than the angular particles of the cement.
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