Abstract
This article deals with the comparison between the metakaolin and condensed silica fume contributions in the flyash based self-compacting concrete (SCC). Self-compacting concrete with mineral admixtures like flyash and condensed silica fume is prepared by cement replacing partially at 20 and 10 percentages respectively. M40 grade of the concrete was designed by adjusting the ratio of the fine aggregate to the total aggregate volume to fulfill the requirements of the SCC. Another M40 grade of SCC is designed with the flyash and metakaolin as the mineral admixtures with the same percentage of replacement for cement by mass. Rheological properties are examined as per EFNARC specifications for flowability; passing ability and segregation resistance for both the triple blended self-compacting concretes (TBSCC). For getting the required flowability of concrete and for modifying the viscous nature of the concrete, superplasticizer and viscosity modifying agents are additionally added to the concrete. The structural properties like compression and split tensile strengths of the specimens are recorded by conducting the standard tests. By comparing the strength results, it is concluded that metakaolin and silica fume have only marginal changes between them in the rheological as well as the mechanical properties of the triple blended self-compacting concrete.
Highlights
Compaction of the concrete has a very significant role in obtaining the required strength of the concrete
It is observed that the rheological properties of these triple blended self-compacting concrete (Table 7) are found to be as per the norms of the EFNARC (14) specifications
In the self-compacting concrete (SCC) mix mentioned in table 4, it is observed that the mineral admixtures have influenced the primary properties of the SCC like passing, free-flowing, and no segregation
Summary
Compaction of the concrete has a very significant role in obtaining the required strength of the concrete. 1058 Effect of Metakaolin and Condensed Silica Fume on the Rheological and Structural Properties of Self-compacting Concrete admixture like superplasticizer (SP) improves the flowability of the concrete. R [7] examined the coal flyash and the bottom ash contributions on the strength properties of self-compacting concrete, and the authors studied the water to cement ratio’s effect on the fresh and hardened properties of SCC. Ramanathan, P [10] conducted the tests on the performance of self-compacting concrete containing different mineral admixtures, and conclusions are drawn from the experimentation giving that mineral admixtures play a major role on the strength of the SCC. Sfikas [11] did the experimental investigation on the rheology and mechanical properties of the self-compacting concrete containing metakaolin and presented improved results.
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