ACI 234R-06 PDF

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Silica fume , also known as microsilica , is a byproduct of the reduction of high-purity quartz with coke in electric arc furnaces in the production of silicon and ferrosilicon alloys.

Silica Fume is also collected as a byproduct in the production of other silicon alloys such as ferrochromium , ferromanganese , ferromagnesium , and calcium silicon ACI Comm. Before the mids, nearly all silica fume was discharged into the atmosphere. After environmental concerns necessitated the collection and landfilling of silica fume, it became economically justified to use silica fume in various applications, in particular high performance concrete [1].

Because of its extreme fineness and high silica content, silica fume is a highly effective pozzolanic material. Silica fume is used as an addition in Portland cement concretes to improve properties.

It has been found that silica fume improves compressive strength , bond strength , and abrasion resistance. The improvements in concrete properties from addition of silica fume stem from both the mechanical improvements resulting from addition of a very fine powder to the cement paste mix as well as from pozzolanic reactions between the silica fume and free calcium hydroxide in the paste.

Addition of silica fume also reduces the permeability of concrete to chloride ions, which protects concrete's reinforcing steel from corrosion , especially in chloride-rich environments such as those of northern roadways and runways because of the use of deicing salts and saltwater bridges. Explorar los wikis Comunidad Central Crear un wiki. Crear un wiki. Department of Transportation, Federal Highway Administration.

Silica fume in concrete: Preliminary report. High-performance silica fume microsilica —Modified cementitious repair materials. Detwiler, Chris A. Fapohunda, and Jennifer Natale January Materials Jounral.

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Silica fume , also known as microsilica , is a byproduct of the reduction of high-purity quartz with coke in electric arc furnaces in the production of silicon and ferrosilicon alloys. Silica Fume is also collected as a byproduct in the production of other silicon alloys such as ferrochromium , ferromanganese , ferromagnesium , and calcium silicon ACI Comm. Before the mids, nearly all silica fume was discharged into the atmosphere. After environmental concerns necessitated the collection and landfilling of silica fume, it became economically justified to use silica fume in various applications, in particular high performance concrete [1].

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Pdf Aci 234R 06 Guide For The Use Of Silica Fume In Concrete Reapproved 2012

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: This research aimed to produce concrete that will decrease disadvantages of portland concrete and resolve it.

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The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts. Author s : ACI Committee Publication: Technical Documents. Keywords: curing; durability; high-range water-reducing admixture; high-strength concrete; placing; plastic-shrinkage cracking; silica fume; time of setting; water-reducing admixture; workability. Abstract: This report describes the physical and chemical properties of silica fume; how silica fume interacts with portland cement; the effects of silica fume on the properties of fresh and hardened concrete; recent typical applications of silica-fume concrete; how silica-fume concrete is proportioned, specified, and handled in the field; and areas where additional research is needed.

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