Self-Compacting Concrete

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Okamura H et al. (2003) "Self-Compacting Concrete" provides general guide lines for the selfcompacting concrete. The method to achieve self compacting behavior by following ways (1)Limited aggregate content (2) Low water-powder ratio (3) Use of superplasticizer. Also a rational mix design method was developed .The various test to check the selfcompacting behaviour of the fresh concrete are as slump flow test, V Funnel test, L Box test, U Box test etc. Also a rational method of mix design was proposed with fixing coarse aggregate at 50% of total volume , fine aggregate percentage to 40% ,maintaining the water powder ratio by volume to to 0.9 to 1.10 and adjusting the water content and superplasticizer dosage. The
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(2010) " Strength and drying shrinkage properties of self-compacting concretes incorporating multi-system blended mineral admixtures" investigated compressive strength and particularly drying shrinkage properties of self-compacting concretes containing binary, ternary, and quaternary blends of Portland cement, fly ash (FA), ground granulated blast furnace slag (GGBFS), silica fume (SF), and metakaolin (MK).The fresh properties of all mixes were with the range specified by EFNARC guidelines. There was a marked reduction in the compressive strength of the concretes with increasing FA content while the concretes having GGBFS had comparable strength values to that of the control concrete. The SF and MK concretes, on the other hand, had consistently higher compressive strength than the control concrete. The negative effect of FA on the compressive strength was relatively diminished with the ternary and quaternary use of mineral admixtures. In the binary blends, replacing PC by FA, GGBFS, and MK reduced the drying shrinkage of SCCs whilst the use of SF with PC gradually increased the drying shrinkage of SCCs. Furthermore, higher the replacement level of FA, GGBFS, and MK, higher the reduction in the shrinkage of the concretes. The increasing effect of SF on the drying shrinkage of SCC was eliminated in the ternary and quaternary blends of mineral…show more content…
(1997) "Durability of Glass Fiber Reinforced Cement Composites " investigates the hot-water durability of glass fiber reinforced cement composites. The different matrices selected were (a) cement; (b) cement + 25% metakaolin; and (c) cement + 25% silica fume. Glass fiber addition was 5% of weight of the composite. Specimens after normal curing of 28 days were immersed in a hot water bath at 50°C for up to 84 days and then tested in flexure and tension. The addition of glass fibers to the cement matrix significantly improves the flexural and tensile behavior of cement matrix. With aging, the GFRC composite that contained metakaolin showed only a relatively minor drop in flexural strength, strain, modulus of elasticity, and toughness, whereas addition of silica fume did not cause any improvement on

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