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Utilization of silica fume in concrete: Review of hardened properties
Several types of industrial byproducts are generated. With increased environmental awareness and its potential hazardous effects, utilization of industrial byproducts has become an attractive alternative to disposal. One such by-product is SF (silica fume), which is a byproduct of the smelting process in the silicon and ferrosilicon industry. Silica fume is very effective in the design and development of high strength high performance concrete. SF has a lot of advantages for example high early compressive strength, high tensile, flexural strength, and modulus of elasticity, increased toughness, high bond strength, enhanced durability, very low permeability to chloride and water intrusion and increased abrasion resistance. Some possible applications of silica fume are shown. This paper covers the physical, chemical properties of silica fume, and its reaction mechanism. It deals with the effect of silica fume on the workability, porosity, compressive strength, splitting tensile strength, flexural strength, creep and shrinkage of concrete.The article led to the following conclusions: Addition of silica fume increases the 28-day compressive strength. Silica fume does not have significant influence on the splitting tensile strength of concrete. It seemed to have a pronounced effect on flexural strength in comparison with splitting tensile strength. For flexural strengths, even very high percentages of silica fume significantly improved the strength. Also, it was found that there was a steady increase in the flexural strength with increase in the silica fume replacement percentage. Increasing the silica fume replacement level increased the secant modulus of concrete. The inclusion of silica fume at high replacement levels significantly increased the autogenous shrinkage of concrete due to the refinement of pore size distribution that leads to a further increase in capillary tension and more contraction of the cement paste. The plastic shrinkage strain increased with increasing dosage of silica fume Silica fume reduced the strain due to creep compared with Portland cement concrete.
Utilization of silica fume in concrete: Review of hardened properties
Several types of industrial byproducts are generated. With increased environmental awareness and its potential hazardous effects, utilization of industrial byproducts has become an attractive alternative to disposal. One such by-product is SF (silica fume), which is a byproduct of the smelting process in the silicon and ferrosilicon industry. Silica fume is very effective in the design and development of high strength high performance concrete. SF has a lot of advantages for example high early compressive strength, high tensile, flexural strength, and modulus of elasticity, increased toughness, high bond strength, enhanced durability, very low permeability to chloride and water intrusion and increased abrasion resistance. Some possible applications of silica fume are shown. This paper covers the physical, chemical properties of silica fume, and its reaction mechanism. It deals with the effect of silica fume on the workability, porosity, compressive strength, splitting tensile strength, flexural strength, creep and shrinkage of concrete.The article led to the following conclusions: Addition of silica fume increases the 28-day compressive strength. Silica fume does not have significant influence on the splitting tensile strength of concrete. It seemed to have a pronounced effect on flexural strength in comparison with splitting tensile strength. For flexural strengths, even very high percentages of silica fume significantly improved the strength. Also, it was found that there was a steady increase in the flexural strength with increase in the silica fume replacement percentage. Increasing the silica fume replacement level increased the secant modulus of concrete. The inclusion of silica fume at high replacement levels significantly increased the autogenous shrinkage of concrete due to the refinement of pore size distribution that leads to a further increase in capillary tension and more contraction of the cement paste. The plastic shrinkage strain increased with increasing dosage of silica fume Silica fume reduced the strain due to creep compared with Portland cement concrete.
Utilization of silica fume in concrete: Review of hardened properties
Siddique, Rafat (author)
Resources, Conservation and Recycling ; 55 ; 923-932
2011
10 Seiten, 6 Bilder, 20 Tabellen, 38 Quellen
Article (Journal)
English
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