Abstract
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..
Highlights
Self-compacting concrete (SCC) is a unique type of flowable, smooth-running concrete, which when placed in the formwork does not require vibration or compaction
The fresh and mechanical test properties where performed on the self-compacting concrete mixture and was observed that: The fresh state of all self-compacting concrete mixes with both mineral admixture had satisfactory performance which as seen in figure 1
The use of metakaolin and silica fume as replacement add to the cohesiveness of the mixes, workability and durability
Summary
Self-compacting concrete (SCC) is a unique type of flowable, smooth-running concrete, which when placed in the formwork does not require vibration or compaction. From the early eighties the use of self-compacting concrete has been extended around the world due to it benefits of production. This concrete is a evolutional step in concrete technology, it is a sophisticated highperformance concrete due to its impact economically and environmental sustainability over the last two decades in the construction industry [1]. Amongst its advantages is the disadvantage of the high volume of admixtures and Portland cement used in the process of mix. The way out of this high cost is the incorporation of pozzolanic materials and mineral admixtures like fly ash, metakaolin, silica fume, granulated blast slag, palm ash in partial replacement with Portland cement. The way out of this high cost is the incorporation of pozzolanic materials and mineral admixtures like fly ash, metakaolin, silica fume, granulated blast slag, palm ash in partial replacement with Portland cement. [2] reported high compressive strength resistance, less
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