KR102004427B1 - Binder composition for non-cement concrete using ash and manufacturing method thereof - Google Patents

Abstract

A high strength ash slag cement according to the present invention comprises 50 to 60% by weight of ash, 15 to 30% by weight of a blast furnace slag fine powder (powder of 3,500 or more) , made of 15 ~ 30% by weight of CaO, CaCl ₂ 5 ~ 10% by weight. The lightweight ash mortar cured product of the present invention comprises 50 to 70% by weight of ash, 10 to 30% by weight of vermiculite expansive aggregate, and 30 to 10% of pearlite expanded aggregate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cement composition for non-cement based ash and manufacturing method,

TECHNICAL FIELD The present invention relates to a cement mortar composition (cured product) composition for curing at room temperature using a coal power plant ash as a main ingredient and a method for producing the same. More specifically, the present invention relates to a high strength cement-based binder and permeable block, an artificial lightweight aggregate, a lightweight brick, a cementitious aggregate, a high strength artificial aggregate, a block, a road pavement concrete, To a cement mortar for room temperature curing which can be used for a lightweight and airtight construction material such as a lightweight partition, a drainage material, a fireproof insulation material, an interlayer noise preventing material and a rainwater infiltration facility (infiltration target, infiltration trench, permeable tunnel, etc.).

Sand (sand and drain construction method), which has been widely used for existing drainage materials and lightweight aggregate, has a problem of poor supply of raw materials due to an absolute lack of usage, low drainage capacity and disconnection of drainage performance due to distortion of ground after construction. There are some limitations in the use of nonwoven fabrics, and chemical products such as nonwoven fabrics have the advantages of excellent performance and easy maintenance. However, they still cause secondary soil contamination problems after they have been used as drainage materials.

In addition, rainwater infiltration facility structures (penetration information, flooded trenches, stone, etc.), concrete which is used as a material or aggregate it and use it as the main raw material for cement, with cement production 1 CO ₂ generated about 0.9 tons per ton of cement manufacturing process 1500 ^o C, and so on. In addition, plastic materials can cause long-term soil contamination problems.

On the other hand, coal ash (ash), which is the residual mineral remaining after combustion of organic organic combustible components of coal, is mostly generated in thermal power plants. In addition, waste incinerators, cogeneration plants, have. Ash is a recyclable material because it is a remnant of combustible material. However, the fact that the unburnt carbon is incidentally contained in the combustion process is always a problem in the technical application.

Such fly ash is classified into two types according to the particle size. When the particle size is less than 100 탆, it is fly ash and when it is more than that, bottom ash is treated as bottom ash.

Among them, about 70% of the fly ash is recycled as concrete admixture and cement raw material, and the bottom ash is not utilized enough, and researches are being conducted on some artificial soil construction, fertilizer, road concrete and water treatment agent have. Examples of using bottom ash as an aggregate include a method of replacing a part of natural or artificial aggregate or a method in which a bottom ash of a heat-combined power plant is mixed with fly ash, gypsum, calcium carbonate and lime, And producing brick products.

However, in the case of bottom ash, it is difficult to recycle in the aspect of economical efficiency. Therefore, most of it is simply landfilled in company headquarters near the power plant, or mixed with fly ash inland or coastal landfill and buried in the vicinity of power plant. .

Korean Patent Registration No. 10-1366293 Korean Patent Registration No. 10-1038796

SUMMARY OF THE INVENTION The present invention provides a high strength ash slag cement (cured product) and a lightweight ash mortar cured product utilizing an ash of a coal power plant which is an industrial byproduct.

The high strength ash slag cement according to the present invention comprises 50 to 60% by weight of ash, 15 to 30% by weight of a blast furnace slag powder (more than 3,500 of powder), 15 to 30% by weight of CaO, CaCl ₂ 5 To 10% by weight.

The lightweight ash mortar cured product of the present invention comprises 50 to 70% by weight of ash, 10 to 30% by weight of vermiculite expansive aggregate, and 30 to 10% of pearlite expanded aggregate.

According to the present invention, ash of coal-fired power plants which have been discarded as waste or rely only on landfill can be recycled and used as lightweight aggregate binder or high strength cement.

1 is a photograph of an interlayer noise preventing panel manufactured by an embodiment of the present invention

The inventor of the present invention has developed high strength slag cement and lightweight slag mortar cement based on ash as a main raw material for researching to utilize ash generated from a coal power plant.

Ash high strength cement of the present invention is composed of 50-60% by weight of ash, blast furnace slag 15 to 30% by weight (powder more and 3,500), CaO 15-30% by weight, CaCl ₂ 5 ~ 10% by weight.

The high-strength ash slag cement (cured product) of the present invention has a compressive strength of 10 MPa or more and can be used as a high-strength artificial aggregate, brick, block concrete for road pavement, and cement substitute for mortar.

The ash used in the high strength ash slag cement (cured product) of the present invention uses bottom ash or fly ash as a by-product in a coal power plant.

The blast furnace slag fine powder is a manufactured article produced by drying and pulverizing blast furnace slag generated in a steel making process, and it is a commercial product which has been established in the KS standard (KS F 2563) and is distributed on the market. It is also preferable that the content of the oxidizing agent ferrous (Fe ₂ O ₃ ) component is less than 0.5% by weight.

The lightweight ash mortar cured product of the present invention comprises 50 to 70% by weight of ash, 10 to 30% by weight of vermiculite expansive aggregate, and 30 to 10% by weight of pearlite expanded aggregate.

The ash used in the lightweight ash mortar cured product of the present invention uses bottom ash or fly ash as a by-product in a coal power plant.

The expanded aggregate used in the present invention is obtained by crushing gemstones such as vermiculite and perlite (perene rock), aggregates which are fired and expanded at a temperature of about 700 to 1000 degrees Celsius, and the crushed aggregate material is used instead of the expanded aggregate It is also possible to do.

If the amount of expanded aggregate is too small, properties such as permeability and sound absorption property are required, and if it is too much, the strength is lowered.

The compressive strength of the light-weight cured product of the present invention is between 5 MPa and 10 MPa. The lightweight cured product composition of the present invention is required to have light weight and voids such as a permeable block, an artificial lightweight aggregate, a lightweight brick, a lightweight partition, a drainage material, a fireproof insulation material, an interlayer noiseproofing material, a rainwater infiltration facility (infiltration target, infiltration trench, Construction materials and so on.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1

72 kg of bottom ash of a coal power plant, 22 kg of blast furnace slag powder having a powder weight of 4050 cm 2 / g, 20 kg of CaO and 6 kg of calcium chloride were homogeneously mixed at room temperature with a forced mixer to prepare a cement composition. The compressive strength was measured at 12.5 MPa.

Example 2

72 kg of fly ash of coal power plant, 22 kg of blast furnace slag powder of 4050 cm 2 / g of powder, 20 kg of CaO and 6 kg of calcium chloride were homogeneously mixed at room temperature with a forced mixer to prepare a cement composition. The compressive strength was measured at 11.5 MPa.

Example 3

The vermiculite expanded aggregate and the pearlite expanded aggregate were pulverized. 60 kg of bottom ash of coal power plant, 20 kg of vermiculite expansive aggregate powder and 20 kg of pearlite expanded aggregate powder were uniformly mixed with a blender, water and an admixture were mixed, and the prepared mixture was injected into a mold. The mixture injected into the mold was naturally cured at room temperature and the cured mixture was separated from the mold and made into a flat plate having a thickness of 5 cm. A photograph is shown in FIG. The measured compressive strength was 5.8 MPa.

Tests were conducted in accordance with KS F 2805 (Sound absorption rate measurement method in reverberation room) in the reverberation room to evaluate the sound absorption rate. The results are shown in Table 1.

Example 4

The vermiculite expanded aggregate and the pearlite expanded aggregate were pulverized. 50 kg of bottom ash of coal power plant, 30 kg of vermiculite expansive aggregate powder, and 20 kg of pearlite expanded aggregate powder were uniformly mixed with a blender, water and admixture were mixed, and the prepared mixture was injected into a mold. The mixture injected into the mold was naturally cured at room temperature and the cured mixture was separated from the mold and made into a flat plate having a thickness of 5 cm. The measured compressive strength was 5.0 MPa.

In order to evaluate the sound absorption rate, the test was carried out according to KS F 2805 (Sound absorption rate measurement method in reverberation room) in the reverberation room. The results are shown in Table 1.

Example 5

The vermiculite expanded aggregate and the pearlite expanded aggregate were pulverized. 70 kg of bottom ash of coal power plant, 15 kg of vermiculite expansive aggregate powder and 15 kg of pearlite expanded aggregate powder were uniformly mixed with a mixer, water and an admixture were mixed, and the prepared mixture was injected into a mold. The mixture injected into the mold was naturally cured at room temperature and the cured mixture was separated from the mold and made into a flat plate having a thickness of 5 cm. A photograph is shown in FIG. The measured compressive strength was 7.8 MPa.

In order to evaluate the sound absorption rate, the test was carried out according to KS F 2805 (Sound absorption rate measurement method in reverberation room) in the reverberation room. The results are shown in Table 1.

frequency 125 250 500 1k 2k 4k Example 3 0.15 0.31 0.56 0.72 0.65 0.61 Example 4 0.16 0.38 0.76 0.87 0.70 0.61 Example 5 0.14 0.28 0.51 0.69 0.59 0.59

Claims (3)

delete delete 50 to 70% by weight of bottom ash of a coal power plant, 10 to 30% by weight of vermiculite expansive aggregate, and 30 to 10% by weight of pearlite expanded aggregate,
Wherein the vermiculite expansive aggregate and the pearlite expansive aggregate are each heated 5 to 10 times by heating the vermiculite and the pearlite ore at a temperature of 700 to 1000 ° C respectively.

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