TW201823181A - Modifier basic oxygen furnace slag (bofs) mixture - Google Patents

Abstract

A modifier Basic Oxygen Furnace Slag (BOFS) mixture includes, in each cubic meter, a cementing material which is between 200 and 500 kilograms in weight, a first filling material which is between 600 and 1200 kilograms in weight, and a second filling material which is between 700 and 1300 kilograms in weight. The first and second filling materials are BOFS of different sizes. Further, the BOFS is preprocessed in order to render the BOFS to exclude f-MgO and f-CaO during the X-ray diffraction, thereby enabling the modifier BOFS mixture to have the properties of low expansion and high stability and reducing the usage of natural resources such as a sand material to lower a cost of the mixture effectively.

Description

 Modified converter stone concrete  

This invention relates to a cured composition, and more particularly to a modified converter stone concrete.

In many constructions, it is urgent to extract a large amount of natural sandstone as a basic material in concrete to facilitate the construction of the building; however, natural sandstone is the most precious resource in nature. Protecting the important components of mountainous terrain, it should not be over-used and wasteful. Therefore, how to balance the construction and maintenance environment is a problem that many operators are eager to overcome. Therefore, how to reduce the natural materials such as sandstone materials Relying on resources, looking for environmentally friendly concepts and low cost, as well as building materials that can replace natural sand and gravel, is a subject of consideration.

Accordingly, it is an object of the present invention to provide a modified converter stone concrete that utilizes a large amount of a particular converter stone as a material while retaining the properties of the concrete.

Accordingly, the present invention relates to a modified converter stone concrete comprising 200 to 500 kg of cement material per cubic meter, a first additive of 600 to 1200 kg, and a second additive of 700 to 1300 kg. And mixing, wherein the first additive comprises at least one converter stone having a particle diameter of less than 4.75 mm; and the second additive comprises at least one converter stone having a particle diameter of 4.75 mm to 19 mm, and the foregoing The converter stone is treated by a process so that the converter stone does not contain free magnesium oxide, free calcium oxide and the like; therefore, the sandstone material can be reduced by designing the treated converter stone through the above ratio design. In addition to the dependence of natural resources, and the use of industrial by-product converter stone can be effectively utilized, the overall cost of the concrete can be reduced to form a high-stability concrete.

The above and other technical features, features, and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

The invention relates to a modified converter stone concrete, which comprises 200-500 kg of cement material in each cubic meter, a first additive of 600-1200 kg, and a second additive of 700-1300 kg. Wherein, the cement material may use pure cement, blast furnace cement, blast furnace fly ash cement, etc.; further, the first additive material includes at least one converter stone having a particle diameter of less than 4.75 mm; and in the embodiment, the first day The additive material may further include a natural sand, and the proportion of the natural sand accounts for 10 to 90% by weight (wt%) of the total proportion of the first additive to reduce the total weight in each cubic meter; and the second The additive comprises at least one converter stone having a particle diameter of 4.75 mm to 19 mm, and the second additive further comprises a natural stone, and the proportion of the natural stone accounts for 10 to 90% by weight of the total proportion of the second additive. (wt%) to reduce the total weight in each cubic meter.

Continuing the foregoing, the cement material may be one of pure cement, blast furnace cement, blast furnace fly ash cement or a mixture thereof, for example, the cement material comprises a cement of 20 to 50 weight percent, and a weight of 30 to 60 weight percent. The whetstone powder and a 10 to 50 weight percent gypsum mixture can be used.

As for the first and second additives, the basic Oxygen Furnace Slag (BOF Slag) is a slag by-product produced by a steel mill, but is produced by iron ore raw materials for steel production. The slag produced by the reaction of the clay impurities and the limestone flux in the high-temperature furnace is discharged and cooled to obtain a solid matter. Generally, the density of the converter stone is relatively high, and the furnace slag is large, about 3.1 to 3.6 kg/cm3, and the unit volume is The weight is about 2.5~2.8g/cm3; the main components are CaO, FeO, SiO2 and Fe2O3, etc. The converter stone has a larger specific gravity than the natural aggregate, and has large particle size, good wear resistance and internal The friction angle is large, the uniaxial compression resistance is high, and the water permeability is large. However, in general, before the converter stone is used for concrete, the converter stone must be ground into a fine powder before being added, and only a small amount can be added. However, the coagulation deterioration (such as swelling, pulverization, etc.) is not caused, and the present invention passes through the mixing ratio of the converter stone through a mixture of a certain proportion of the cement material and the coarse and fine aggregates. The converter stone can be effectively used.

In addition, in order to further ensure the stability of the converter stone, the converter stone used in the present invention is treated to eliminate or reduce the free magnesium oxide and free calcium oxide content components in the converter stone, and the present invention is The processing step refers to the fact that when the converter stone is in the molten converter and is in the liquid slag, an additive is added first, but the liquid slag is fused with the additive without an external heating source, and the additive comprises An alkali metal oxide (such as sodium oxide or the like) of more than 0% by weight and less than or equal to 3% by weight of the liquid slag, and a stabilizer of 10 to 60% by weight based on the weight of the liquid slag, the stability The agent comprises at least cerium oxide or boron trioxide, and when the total weight of the stabilizer is 100% by weight, the content of the cerium oxide or boron trioxide is at least 50% by weight, and is formed after being cooled. Stabilized converter stone.

Still continuing, when the converter stone is actually produced, the temperature of the liquid slag is at least 1300 ° C, and the additive is added to the liquid slag, the alkali metal oxide can reduce the viscosity of the liquid slag, and the high temperature remaining by the liquid slag, Advantageously, the stabilizer is mixed and reacted with the liquid slag, and after the liquid slag is discharged and cooled by the melting converter, a stabilized converter stone is obtained, and the X-ray diffraction detection analysis does not contain free magnesium oxide, free oxidation Calcium and other ingredients.

When the modified converter stone concrete of the present invention is used, the required working degree can be mixed with a proper amount of water, and the following examples are used as experimental explanations: In the first example, each cubic meter contains 325 kg of cement material, cemented. The material is made by mixing 146kg (45wt%) of cement, 114kg (35wt%) of hearthstone, and 65kg (20wt%) of gypsum. The first additive is added with 894kg of converter stone less than 4.75mm, and the second additive is added. There are 826kg (for 9.5mm total 573kg, 19mm total 253kg) converter stone with a particle size of 4.75mm to 19mm, after mixing for 7 days and 28 days of compressive strength (kg/cm2), they are 238.4kg respectively. /cm2 and 420.0kg/cm2, and there is no pulverization in the volume part. Therefore, through the above-mentioned first and second additive ratios and converter stone source design, the natural resources dependence of sand and gravel materials can be reduced, and The overall cost of the concrete is reduced to form a high-stability concrete.

In summary, the modified converter stone concrete of the present invention comprises 200 to 500 kilograms of cement material per cubic meter, a first additive of 600 to 1200 kilograms, and a second additive of 700 to 1300 kilograms, By using the first additive and the second additive to select a converter stone having a certain particle size and condition, a high stability (low expansion) concrete can be formed, and at the same time, natural materials such as sandstone materials can be further reduced. In addition to the dependence on resources, the overall cost of the concrete can be reduced, and the way of reusing the converter stone can be increased, thereby achieving the effects of energy saving, carbon reduction and environmental protection.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the description of the invention. All should remain within the scope of the invention patent.

Claims (5)

 A modified converter stone concrete, which comprises 200 to 500 kilograms of cement material per cubic meter, a first additive of 600 to 1200 kilograms, and a second additive of 700 to 1300 kilograms, etc. Wherein, the first additive comprises at least one converter stone having a particle diameter of less than 4.75 mm; and the second additive comprises at least one converter stone having a particle diameter of between 4.75 mm and 19 mm, and the first and the first The converter stones are treated with the added materials, and do not contain free magnesium oxide, free calcium oxide and the like.    According to the modified converter stone concrete according to claim 1, wherein the cement material is one of pure cement, blast furnace cement and blast furnace stone fly ash cement.    The modified converter stone concrete according to claim 1, wherein the cement material comprises 20 to 50% by weight of cement, 30 to 60% by weight of hearth powder, and 10 to 50% by weight of gypsum. Mixed.    The modified converter stone concrete according to claim 1, wherein the first additive further comprises a natural sand, and the proportion of the natural sand is 10 to 90% by weight of the first additive.    The modified converter stone concrete according to claim 1, wherein the second additive further comprises a natural stone, and the natural stone proportion accounts for 10 to 90% by weight of the second additive.