Incorporation of Silica Fume and Metakaolin on Self Compacting Concrete
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This study carried out an experimental design investigating the reaction of mineral
admixtures on fresh and hardened properties of sustainable self compacting concrete
(SCC). Silica fume (SF) and metakaolin (MK) were partially replaced by Portland
cement at 5, 10, 15, 20 and 25% in varying proportions. The workability on the fresh
concrete was examined and the strength performance. The water cement ratio of 0.38
was kept constant for all the samples tested. The compressive strength was measured
at 7, 14, 21 and 28 curing days. The test results indicated that with the influence of 2%
superplasticizer, the fresh concrete showed a satisfactory workability, decreased the
segregation to resistance, ease of flowing ability with the addition of silica fume and
metakaolin. It was concluded in this study that, the replacement with silica fume was
found to have an early strength gain in the compressive strength of SCC samples and
a decrease at varying dosages. However, 15% metakaolin was considered to be a
suitable replacement with 49.08 MPa at 28days compared with the control mix..
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