Steel Concrete
November 19th, 2007
why the use of silica fume and fly ash reduce the corrosion of reinforcing steel in concrete ?
and extend the service life of concrete structures.
Silica fume, also known as microsilica, is a byproduct of the reduction of high-purity quartz with coal in electric 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. 226 1987b). Before the mid-1970s, 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.
*Silica Fume consists of very fine vitreous particles with a surface area ranging from 60,000 to 150,000 ft^2/lb or 13,000 to 30,000 m^2/kg when measured by nitrogen absorption techniques, with particles approximately 100 times smaller than the average cement particle. Because of its extreme fineness and high silica content, Silica Fume is a highly effective pozzolanic material.
*Silica Fume is used in concrete to improve its properties. It has been found that Silica Fume improves compressive strength, bond strength, and abrasion resistance; reduces permeability; and therefore helps in protecting reinforcing steel from corrosion.
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Hilti TE55 115 Volt Rotary Hammer Drill 1/2″ Steel 2″ Concrete No Reserve $0.01 |
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NEW 5 HILTI HDI 3/8″ HEAVY DUTY DROP IN CONCRETE ANCHORS~FASTENERS~MADE IN USA $0.99 |
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Concrete Forms Steel Frame $0.99 |
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OZTEC 1.2 OZ Portable Electric 1.25 HP Concrete Vibrator 1.5″ Max Steel Head $0.99 |
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STEEL WIRE ROPE CABLE CLAMP, GARAGE DOOR SPARES COMPTON CABLES CONCRETE WEIGHTS $1.57 |
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EMT STEEL COUPLING COMPRESSION 1-1/4″ Steel Concrete-Tight With Compression Nut $1.59 |
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EMT STEEL COUPLING COMPRESSION 1-1/2″ Steel Concrete-Tight With Compression Nut $1.89 |
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STEEL EMT CONN SET-SCREW INSULATED 2 ” Steel With Insulated Throat Concrete-Tigh $2.34 |
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EMT STEEL CONNECTOR COMPRESSION 2 ” Steel Concrete-Tight With Compression Nut $2.56 |
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EMT STEEL COUPLING COMPRESSION 2″ Steel Concrete-Tight With Compression Nut $2.65 |
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Grandt Line HO #5176 Concrete & Steel Sta w/Open Risers $2.70 |
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1903-03-21- MONTREAL STEEL AND CONCRETE GRAIN ELEVATOR $2.95 |
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New OOK 30 lb. Steel Concrete Picture Hangers pack of 3 $3.35 |
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Daltile Concrete Connection Porcelain Floor Steel 13″ $3.72 |
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Daltile Concrete Connection Porcelain Floor Steel 20″ $3.99 |
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Daltile Concrete Connection Porcelain Floor Steel 13×20 $4.59 |
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AUDUBON IA 1965 “Albert” World’s Largest Bull 45 Tons of Concrete & Steel GEM+++ $4.60 |
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STEEL EMT CONNECTOR SET-SCREW 2-1/2 ” Steel Concrete-Tight $4.80 |
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16″ RUBBER WORK CONCRETE BOOTS STEEL TOE MENS 11 D STANLEY SWAMP HUNTING $4.95 |
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LOT OF ~30~ GERMANY CARBIDE STEEL MASONARY ROTARY DRILL BITS CONCRETE 1/2″ 3/8″ $4.99 |
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~30~ GERMANY CARBIDE STEEL MASONARY BITS CONCRETE 3size $4.99 |
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STEEL CITY EMT 3/4″ CONCRETE/RAIN TIGHT COMPRESSION COUPLINGS – 8 PIECES – NEW $5.00 |
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RPPc Currie Mn Cement Concrete Block Factory Plant Old Car Truck Steel Bridge Mo $5.00 |
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Vintage Postcard, Concrete Steel Bridge, Salmon River, Pulaski, N.Y. M1 $5.25 |
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STEEL EMT CONN SET-SCREW INSULATED 2-1/2 ” Steel With Insulated Throat Concrete- $5.34 |
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NEW HAND TOOLS – 4 pc CONCRETE TROWEL SET Carbon Steel $5.99 |
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STEEL EMT CONNECTOR SET-SCREW 3 ” Steel Concrete-Tight $6.00 |
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Dasco 1 3/4″ x 7″ Solid Steel Concrete Chisel — Made in the USA $6.00 |
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BOSS/Bostitch Fasteners Firring Strips Concrete/Steel PFK1004 $6.25 |
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6′ X 4” Blue Steel Hand Edger 1/4″ r -Concrete Tool $6.50 |
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6′ X 4” Blue Steel Hand Edger 1/2″ radius-Concrete Tool-Made in the USA $6.50 |
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Marshalltown 6′ X 3″ Blue Steel Hand Edger 1/2″ radius – Concrete Tool $6.50 |
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6′ X 2″ Blue Steel Hand Edger 1/4″ r -Concrete Tool $6.50 |
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6′ X 2″ Blue Steel Hand Edger 3/8″ r -Concrete Tool $6.50 |
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6′ X 1 1/2″ Stainless Steel Hand Edger – Concrete Tool $6.50 |
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Concrete Construction Magazine January 2008 High Strength Reinforcing Steel VG $6.74 |
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6′ X 6” Blue Steel Hand Edger 1/4″ r -Concrete Tool $6.75 |
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6′ X 6” Blue Steel Hand Edger 3/8″ r -Concrete Tool $6.75 |
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6″ X 6” Blue Steel Hand Edger 1/4″ r -Concrete Tool $6.75 |
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Kraft 6′ X 6” Blue Steel Hand Edger 3/4″ r -Concrete Tool – Made in the USA $6.75 |
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6′ X 6” Blue Steel Hand Edger 1″ r -Concrete Tool Made in the USA $6.75 |
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STEEL EMT CONN SET-SCREW INSULATED 3 ” Steel With Insulated Throat Concrete-Tigh $6.86 |
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Concrete Hand Tool Stainless Steel Edger, 6″ x 3″ #6100 $6.98 |
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Concrete Edger, Stainless Steel 6″ x 3.5″ #6101 $6.98 |
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1″ x 6″ Stainless Steel End Edger — Concrete Tool Made in the USA $7.00 |
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Dasco 2 1/4″ x 7″ Solid Steel Concrete Chisel — Made in the USA $7.00 |
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STEEL EMT CONNECTOR SET-SCREW 4 ” Steel Concrete-Tight $7.05 |
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35mm Heavy Duty Core Drill Tempered Steel For Concrete, Brick and Aerated Block $7.83 |
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Shrum designs Apartment Bldg in Omaha NE Wilson Concrete 1965 Armco Steel Ad $7.95 |
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Brown Palace Hotel Denver 1960 CRSI Concrete Steel Ad $7.95 |
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CONCRETE-STEEL CONSTRUCTION BUILDINGS Henry Eddy C. A. P. Turner on CD $7.95 |
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STEEL EMT CONNECTOR SET-SCREW 3-1/2 ” Steel Concrete-Tight $7.97 |
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1910 PANAMA STEEL FORMS FOR LAYING CONCRETE AT GATUN PC $7.98 |
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Tungsten Carbide Grit Tile File Shapes Ceramic Steel Concrete Marble Cast Iron $7.99 |
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CARBIDE STEEL MASONRY CONCRETE DRILL BITS 3 PC NEW GERMAN TIPPED 1 PACK $7.99 |
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~30~ GERMANY CARBIDE STEEL MASONARY BITS CONCRETE 3size $7.99 |
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EGSCO Permanent Steel Forms concrete floor 1959 Ad $7.99 |
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Buddy L Rotating Cement Concrete Mixer Truck Pressed Steel $8.00 |
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1903 Article: Pacific Electric Railway Los Angeles CA Concrete-Steel Chimney $8.00 |
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1905 Article: Gruenwald Bridge Munich Germany Concrete-Steel Arch Bridge $8.00 |
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Concrete Construction Magazine February 1981 Steel Corrosion Concrete Surfaces $8.24 |
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EMT STEEL CONNECTOR COMPRESSION 3 ” Steel Concrete-Tight With Compression Nut $8.25 |
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EMT STEEL COUPLING COMPR. 2-1/2″ Steel Concrete-Tight With Compression Nut $8.46 |
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Pool Brush 10″ Stainless Steel Bristle Gunite Concrete Ocean Blue 110015 NEW $8.99 |
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ZZ TOP-CONCRETE AND STEEL CD SINGLE! $9.00 |
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Steel City 3/4″ EMT Conduit Fitting Concrete Steel (8) $9.00 |
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Concrete Edger, Stainless Steel 8″ x 5″ #6722 $9.05 |
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Concrete Edger, Stainless Steel 8″ x 5″ x 3/8 Rad.#6721 $9.05 |
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Marshalltown Nu-Pride 16492 Steel Concrete Edge Trowel $9.49 |
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Stainless Steel Outside Step (Nose) 3/4″r Concrete Tool $9.50 |
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Stainless Steel Outside Step (Nose) 1/8″r Concrete Tool $9.50 |
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Stainless Steel Outside Step (Nose) 1″r Concrete Tool – Made in the USA $9.50 |
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Blue Steel Inside Walking Concrete Step Tool – 1/2″ Radius – Made in the USA $9.50 |
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Titan HD Steel Anchor System Concrete Masonry T-Shirt – Black – size L $9.65 |
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Concrete Tools Groover, Stainless Steel 6″ x 3″ #6104 $9.73 |
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5X REMGRIT CARBIDE JIGSAW JIG SAW BLADE TILE METAL CONCRETE STEEL MASONARY BRICK $9.95 |
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1906 Paper Ad Marlborough Blenheim Hotel Made Kahn System Trussed Concrete Steel $9.95 |
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Vtg Granco Steel Products Co Catalog~Cofar Concrete Reinforcement $9.98 |
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Build Fireproof Rail Steel Concrete Reinforcing Ad 1928 $9.99 |
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CRSI Design Handbook, 1st Edition, Signed. Concrete Reinforcing Steel Inst $9.99 |
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1909 Ad HY-RIB Partitions Trussed Concrete Steel Company Detroit Kahn Systems $9.99 |
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1909 Ad Triangular Mesh Concrete Reinforcement American Steel Wire Company $9.99 |
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1942 Red Star Steel Wheel Concrete Carts Telescoping Chute Batch Box Ad $9.99 |
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~ 100 ~ CARBIDE STEEL MASONRY CONCRETE 5/16″ DRILL BITS $9.99 |
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~ 100 ~ CARBIDE STEEL MASONRY CONCRETE 5/16″ DRILL BITS $9.99 |
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NEW – Goldblatt G06264 Stainless Steel Concrete Edger 6″ X 3″ 084389062644 $9.99 |
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Symons Steel-Ply Concrete Forming System 1981 print Ad $9.99 |
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Granco Steel Products Concrete Floor System print Ad $9.99 |
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1917 Hy-Rib steel mesh plaster concrete wall print ad $9.99 |
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USF Steel Forms Concrete Bridge Decks 1960 print Ad $10.00 |
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Symons Steel-Ply Norwalk conn Concrete Towers 1966 Ad $10.00 |
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SYMONS Steel-Ply concrete forming system 1980 print Ad $10.00 |
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Concrete Tool, Edger Stainless Steel 1/4″ Radius 17887 $10.47 |
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Concrete Tool, Edger Stainless Steel 3/8″ Radius 17890 $10.47 |
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Concrete Tool, Edger Stainless Steel 1/2″ Radius 17889 $10.47 |
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Concrete Tool, Edger Stainless Steel 3/4″ Radius 17888 $10.47 |
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Stainless Steel Hand Concrete Step & Corner Trowel#6725 $10.48 |
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Stainless Steel Hand Concrete Step & Corner Trowel#6726 $10.48 |
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50mm Heavy Duty Core Drill Tempered Steel For Concrete, Brick and Aerated Block $10.35 |
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EMT STEELCONNECTOR COMPRESSION 3-1/2″ Steel Concrete-Tight With Compression Nut $10.64 |
