Abstract
AbstraAbstract Self-compacting concrete (SCC) is a special type of concrete that can flow through intricate geometrical configurations under its own mass without external or internal vibration or segregation. The objectives of the research work were to evaluate the effects of filler types (silica fume and limestone dust) and high- range water- reducing agent, (HRWRA, superplastizier-type Sikament -163) on the workability and splitting tensile strength of SCC. The experimental results showed the using silica fume and limestone dust in Self-compacting concrete led to a considerable improvement in splitting tensile strength. As the percentage of limestone powder and silica fume increases, the workability properties of SCC slightly decreased with increases in splitting tensile strength. The workability properties of SCC for all the replacements satisfy the recommended values given by specifications. Keywords: self-compacting concrete, silica fume, limestone dust, fillers, strengths, splitting, super plasticizers
Highlights
Self-Compacting Concrete, started in Japan in the late 80‟s to solve problems of pouring and setting concrete in high rebar densities structures, has slowly spread all over the world, showing many other characteristics and attracting attention first in laboratories and in application
The results indicated that the splitting tensile strength for Self-compacting concrete (SCC) cured in water or air at 28 days is increased by 25% compared to that of normal concrete, this indicates that the type of curing is not so important for the development of tensile strength of SCC
The results indicated that the dosage of 3.0% superplasticizer by weight of cement gave water reduction (21.15%, 21.15% and 17.30%) for self-compacting concrete with limestone dust of (0%, 5% and10%) by weight of cement respectively
Summary
Self-Compacting Concrete, started in Japan in the late 80‟s to solve problems of pouring and setting concrete in high rebar densities structures, has slowly spread all over the world, showing many other characteristics and attracting attention first in laboratories and in application. Dehn F. et al [2] have focused their research work on the time development of SCC compressive and splitting tensile strength and the bond behavior between the reinforcing bars and the self-compacting concrete compared to normal concrete. All the components should be coordinated so that bleeding and segregation would be prevented. Because of these aspects, their mix design was based on experience from Japan, Netherlands, France, and Sweden. Experimental results showed higher compressive strengths (36%) and splitting tensile strengths (28%) of the SCC specimens compared to normal concrete specimens. The bond behavior measured at 1, 3, 7 and 28 days after concreting was better for self-compacting concrete than that of normally vibrated concrete
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