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Influence of admixing natural pozzolan as partial replacement of cement and microsilica in UHPC mixtures

Ultra-high performance concrete (UHPC), comprising of high amounts of cement and microsilica as binder and micro filler, is a new generation of concrete possessing highly dense microstructure with excellent mechanical properties, durability characteristics and ductility (fracture toughness).The natural pozzolan is a volcanic powder containing siliceous or siliceous and aluminous materials without considerable lime, and is being used since long as one of the mineral admixtures in concrete [5].Influence of admixing natural pozzolan as partial replacement of cement ...Here in the experiment an attempt has been made to increase the strength of concrete by replacing cement with 0%,5%,10%,15% and 20% of Micro silica in a design mix of M35 and M40.The materials are taken from the locally available sources in the North Eastern region. The compressive strengths are checked for the mentioned design mixes.CONCRETE MIX PROPORTIONING USING MICRO SILICA - DigitalXploreاحصل على السعر

How Microsilica Improves Concrete - Concrete Construction

Microsilica in concrete contributes to strength and durability two ways: as a pozzolan, microsilica provides a more uniform distribution and a greater volume of hydration products; as a filler, microsilica decreases the average size of pores in the cement paste.XRD patterns of concrete surface after exposure in sulphuric acid. Concrete specimens containing: microsilica (1); wood ashes (2); wood + barley straw ashes (3) The penetration of water and SO 4 2– containi g solution is in straight proportion to admixture (pozzolana) of specimens and time of exposure.Effect of Pozzolanic Additives on Structure and ... - ScienceDirectStudies have shown that the pozzolanic additives reduce porosity, increase density and as a consequence increase the chemical durability of concrete to sulphate ion containing solution. (C) 2013 ...(PDF) Effect of Pozzolanic Additives on Structure and Chemical ...احصل على السعر