Corrosion of Embedded Materials - Portland Cement Association

Rather, iron ore is smelted and refined to produce steel. The production steps that transform iron ore into steel add energy to the metal. ... The amount of carbonation is significantly increased in concrete with a high water-to-cement ratio, low cement content, short curing period, low strength, and highly permeable or porous paste. ...

Producing Portland cement from iron and steel slags and ...

Samples with higher lime saturation factor developed higher C 3 S content and better mechanical properties. Blending 10% extra iron slag to a cement composed of 49% iron slag, 43% calcined lime, and 8% steel slag kept the compressive strength of concrete above standard values for type I ordinary Portand cement.

Quality of Water for Making Concrete: A Review of Literature

concrete by dissolving part of the cement do not cause any expansion, but progressively weaken the material by removal of cementing constituents forming soft and mushy mass. Paulo J.M. and etal[4] specify that, any water with pH value less than 12.5 may be …

8 Main Cement Ingredients Composition and Their Functions

The sum of iron oxide in cement varies from 0.5 to 6%. It can be extracted from fly ash, iron ore, scrap iron, and so on. The main function of iron oxide is to give the cement color. At high temperatures, by reacting with aluminum and calcium, iron oxide forms tricalcium aluminoferrite.

Iron Sulfides and Concrete - RJLG

Iron Sulfides and Concrete Iron sulfides are accessory minerals found in a variety of rock types, with pyrite (FeS 2) and pyrrhotite (Fe 1-x S) (x = 0 to 0.2), being most common. Under some conditions, these minerals can undergo oxidation reactions that have the potential to …

Composition of cement

Iron, Fe 2 O 3: from from clay, iron ore, scrap iron and fly ash Gypsum, CaSO 4 .2H 2 0: found together with limestone The materials, without the gypsum, are proportioned to produce a mixture with the desired chemical composition and then ground and blended by one of two processes - …

8 Main Cement Ingredients & Their Functions - Civil ...

Samples with higher lime saturation factor developed higher C 3 S content and better mechanical properties. Blending 10% extra iron slag to a cement composed of 49% iron slag, 43% calcined lime, and 8% steel slag kept the compressive strength of concrete above standard values for type I ordinary Portand cement.

8 Main Cement Ingredients & Their Functions - Civil ...

Excess magnesia will reduce the strength of the cement. Iron oxide: Chemical formula is Fe 2 O 3. Iron oxide imparts color to cement. It acts as a flux. At a very high temperature, it imparts into the chemical reaction with calcium and aluminum to form tricalcium alumino-ferrite. Tricalcium alumino-ferrite imparts hardness and strength to cement.

High iron oxide hydraulic cement - Reagents of the ...

Abstract: Hydraulic cements having higher (about 5%) iron-oxide content and lower (43-57%) than the usual calcium-oxide content of Portland cements are disclosed. These high iron-oxide cements have normal setting times, but high early strengths that develop without resorting to fine grinding or …

What Is The Recycled Content Of Ductile Iron Pipe and Why ...

Mar 22, 2019· All the iron and steel used in making ductile iron pipe is recycled. However, it cannot be referred to as a 100 percent recycled product because there are other materials added, such as magnesium, during the manufacturing process. Different methods may be used to calculate recycled content and ductile iron pipe, typically being lined with ...

Cement Chemistry - The Concrete Portal

This cement contains 32 – 45% Al 2 O 3, about 15% iron oxides, and 5% SiO 2, with the remainder composed of CaO. The primary phase present is Calcium Aluminate, or CA. This cement is produced by sintering a mixture of aluminous (typically bauxite) and calcareous components, and grinding to …

Portland cement - Wikipedia

The main requirement is to have a low iron content which should be less than 0.5 wt.% expressed as Fe 2 O 3 for white cement, and less than 0.9 wt.% for off-white cement. It also helps to have the iron oxide as ferrous oxide (FeO) which is obtained via slightly reducing conditions in the kiln, i.e., operating with zero excess oxygen at the kiln ...

Chemical Composition of Cement

SO3 content must be between ( 3-2.5 )% according to type of cement and C3A content. The percentage of MgO in cement which is come from Magnesia compounds in raw material. is about ( 4-1)% and 5% as maximum range to control expansion from hydration of this oxide in hard concrete. An increase in lime CaO content beyond a certain value makes it ...

11.6 Portland Cement Manufacturing

Aug 17, 1971· Aug 17, 1971· cement is used for structural applications and is the more common type of cement produced. White portland cement has lower iron and manganese contents than gray portland cement and is used primarily for decorative purposes. Portland cement manufacturing plants are part of hydraulic cement

Producing Portland cement from iron and steel slags and ...

Sep 01, 1999· Silica and iron oxide are added to balance the composition, so that the content of oxides in cement is approximately 62–68% CaO, 21–24% SiO 2, 4–8% Al 2 O 3, and 2–5% Fe 2 O 3. This composition leads to 45–65% C 3 S, 15–35% C 2 S, 4–14% C 3 A, and 10–18% C 4 AF . Other impurity oxides can affect adversely the quality of cement.

Proportions of Cement Ingredients, Their Functions and ...

4.Iron oxide (Fe 2 O 3) Iron oxide quantity in cement is ranges from 0.5 to 6%.It can be obtained from fly ash, iron ore, scrap iron etc. The main function of iron oxide is to impart color to the cement. At high temperatures, Iron oxide forms tricalcium aluminoferrite by reacting with aluminum and calcium.