KR20020026794A - Manufactured goods of concrete using bottom ash and the manufacturing method thereof - Google Patents

Abstract

PURPOSE: Provided are concrete products using bottom ash, industrial waste, as an aggregate, and a manufacturing method of concrete products with absorption, particle size, pressure and strength required for construction materials. CONSTITUTION: The compositions and manufacturing methods of concrete products are as follows: 18.0-22.5 wt.% of cement, 2.0-2.5wt.% of admixture, blast furnace slag, 75.0-80.0wt.% of aggregates comprising sand and bottom ash in the same wt.%, and 50-70wt.% of water; 20.0-25.0wt.% of cement, 75.0-80.0wt.% of aggregates comprising sand and bottom ash in the same wt.%, 1% of fluidifying agent, and 50-70wt.% of water; 22.5-23.75wt.% of cement, 1.25-10.0wt.% of admixture, desulfurized gypsum(or silica hume), 75.0wt.% of aggregates, bottom ash(or sand and bottom ash in the same wt.%), less than 1% of fluidifying agent, and 42.0-44.0wt.5 of water; 22.5wt.% of cement, 2.5-5.0wt.% of desulfurized gypsum, 75.0wt.% of bottom ash, 0.49% of fluidifying agent, and 42.0wt.% of water, and the concrete products are manufactured by forming the above composition, and steam-curing at 60deg.C.

Description

Manufactured goods of concrete using bottom ash and the manufacturing method

The present invention relates to a concrete product using the bottom ash, which is an industrial waste, and a method for producing the concrete product. More specifically, the bottom ash is used as an aggregate to have a strength required by the Korean Industrial Standard (hereinafter referred to as "KS"). It is to provide a concrete product and a method for producing the concrete product.

In Korea, coal-fired power plants are being constructed and large amounts of coal ash are emitted due to thermal power generation. However, due to the lack of research, a considerable amount of coal ash is not recycled. This problem has a disadvantage in that the quality of coal ash is not uniform, it is not used as a raw material of concrete admixtures or cement. Therefore, the present inventors have come to think of the alternative method of using coal ash, especially bottom ash, as a royal dust or fine aggregate.

The techniques using this bottom ash are as follows.

As a concrete using cement mortar and recycled aggregate developed by the present inventors, according to Korean Patent Publication No. 1998-9163, published on April 30, 1998, when the recycled aggregate obtained by crushing waste concrete is used in a concrete structure, 53-79.9% by weight of sand and 12-18% by weight of cemented steel, 1-2.5% by weight of gypsum, 5-19% by weight of fly ash, 1.5-3.5% by weight of bottom ash, Disclosed is a cement mortar blended at a ratio of 0.1-0.5% by weight and 0.5-3.5% by weight of a glidant.

Since this technology uses only about 1.5-3.5% by weight of bottom ash in mortar, there is a problem that the bottom ash discharged from the thermal power plant cannot be fully utilized.

According to the publication No. 1991-19920, which was patented on December 19, 1991, as a main raw material of bottom ash, 5% of cyanite powder, 5% of blast furnace slag and waste gypsum, carbine ash and slab refined sludge 5% by mixing two or more of the clinker powder calcined in the temperature range of 800-1000 ℃ mixed with 30-40% limestone clinker powder calcined in the temperature range of 800 ℃ -1200 ℃ and 45-55% powdered bottom ash Disclosed is a technique related to a method for producing cement that is mixed with each other.

Since this technique uses bottom ash as a raw material of cement, there is a problem in that the bottom ash discharged from the thermal power plant cannot be fully utilized, and a large amount of energy must be consumed in order to powder the bottom ash.

The present invention is to solve the above problems, the first object of the present invention is to provide a concrete product that can use a large amount of bottom ash, industrial waste, and does not consume a lot of energy for its use will be.

The second purpose is to provide concrete products that can achieve the absorption rate, compounding ratio, particle size, pressure, strength, etc. that concrete needs in building materials when bottom ash is used as aggregate for concrete. It is to provide.

1 is a specimen forming process diagram of an embodiment of the present invention

2 is a view showing a Brazilian test method for testing the tensile strength of the product according to the present invention.

3 is a graph showing the change in tensile strength and water absorption according to the mixing amount (wt%) change

4 is a graph of change in tensile strength when 100% bottom ash is applied

5 is a graph of change in tensile strength when 50% of bottom ash is applied

6 is a graph showing the change in tensile strength and water absorption according to the change in the mixing amount (wt%) when the ratio of cement / bottom ash is 1: 3

7 is a graph showing the change in tensile strength and water absorption according to the change in mixing amount (wt%) when the ratio of cement / bottom ash is 1: 4

8 is a graph showing the change in tensile strength and water absorption according to the change in the mixing amount (wt%) when the bottom ash is replaced by 50% when the C / S ratio is 1: 3.

9 is a graph showing the change in tensile strength and water absorption according to the change in the mixing amount (wt%) when the bottom ash is replaced by 50% when the C / S ratio is 1: 4.

10 is a graph showing changes in tensile strength and water absorption when 10% of cement is replaced with silica fume

11 is a graph of changes in tensile strength and water absorption when 10% of cement is replaced by blast furnace slag.

12 is a graph of changes in tensile strength and water absorption when 1% of a fluidizing agent is added

13 is a graph of changes in tensile strength and water absorption (IIa-3) when a part of cement is replaced with a mixed material

14 is a graph of changes in tensile strength and water absorption (IIb-4) when a part of cement is replaced with a mixed material

15 is a graph of changes in tensile strength and water absorption (IIIa-2) when a part of cement is replaced with a mixed material

16 is a graph of changes in tensile strength and water absorption (IIb-3) when a part of cement is replaced with a mixed material

17 is a graph of changes in tensile strength and water absorption rate (IIa-3) when a part of cement is replaced with desulfurized gypsum

Figure 18 is a graph of the first test compressive strength test results for block manufacturing

Figure 19 is a graph of the second test compressive strength test results for block manufacturing

The first invention for achieving the above object is cement 18.0wt% or more 22.5wt% or less, admixture 2.0wt% or more and 2.5wt% or less, aggregate 75.0wt% or more 80.0wt% or less, the mixing amount is 50wt% or more 70wt% Concrete products characterized in that blended in the ratio of less than%, the second invention is a mixture of cement 20.0wt% or more, 25.0wt% or less, aggregate 75.0wt% or more and 80.0wt% or less, 1% of a fluidizing agent in this formulation Concrete products, characterized in that the mixing amount is blended at a ratio of 50wt% or more and 70wt% or less, the third invention is cement 22.5wt% or more 23.75wt% or less, admixture 1.25wt% or more 10.0wt% or less, aggregate Concrete products, characterized in that the formulation is added to 75.0wt%, 1% or less of the fluidizing agent added to the formulation, the fourth invention is cement 22.5wt%, desulfurized gypsum 2.5wt% or more 5.0wt%, bottom ash 75.0wt %, And after adding 0.49% of fluidizing agent, Concrete products, characterized in that the molded product was steam-cured at a temperature of 60 ℃, the fifth invention is cement 22.5wt%, desulfurized gypsum 2.5wt% or more 5.0wt%, bottom ash 75.0wt% After the addition of 0.49% of a fluidizing agent, the step of forming a shape that requires concrete mixed with the mixing amount of 42.0wt% ratio and steam-cured molding molded in the process at a temperature of 60 ℃ It can be achieved by a method for producing a concrete product.

EXAMPLE

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Experimental material

The material used in the present example was used as one type of ordinary portland cement (OPC) manufactured by Halla Cement, and silica fume and blast furnaceslag were used as subsidiary materials. The blast furnace slag used a product having a powder degree (Blaine N ^0. 6000) and silica fume used a product having a powder degree of 18,000 manufactured by SKW of Canada. In addition, bottom ash used a product supplied by Korea Fryash Cement Co., Ltd.

The chemical components of these four samples are shown in Table 1 below.

The sand used was less than 5mm, and was washed with water to remove salt and then kept dry. In order to replace part of the sand, stone powder generated from quarries was used.

The bottom ash used in this example was discarded / buried at the Seocheon thermal power plant, and the specific gravity was 2.1 and the absorption rate was 2.0.

After washing with water to remove the salt, the particle size was adjusted according to the particle size distribution prescribed in KS F 2526, and then used as a dry state. The shape and size distribution of bottom ash are shown in Table 2 according to the particle size distribution of bottom ash remaining in each sieve after sifting test according to KS F 2502.

The fluidizing agent has been used to enhance water tightness, fluidity and susceptibility in that the dispersion sensitivity is superior to conventional surfactants and is air-free. Naphthalene sulfonate sodium salt (POWERCON-100) produced by Kyonggi Chemical Co., Ltd. The specification is shown in Table 3.

Formulation Design

The primary blending ratio for the manufacture of interlocking blocks using bottom ash was based on the on-site blending ratio of P, an interlocking block producer. This was to obtain the best tensile strength by changing the cement / sand (C / S) ratio to 1/5 and changing the mixing amount (wt%). The mixing amount was changed to 20%, 25% and 30%, and the ratio of sand to stone was set at almost 1: 1. The compounding ratio is shown in Table 4.

Note 1: Mixing ratio in actual production process

In the second formulation, the C / S ratio is 1: 3 and 1: 4, and the mixing amount (wt%) is changed to 50 to 90%. At this time, 100% of bottom ash was replaced by sand (S), and only 50% of bottom ash was also shown. Therefore, the bottom ash is 75% when the weight ratio is 100% and the bottom ash is 37.5% when the weight ratio is 50%. These compounding ratios are shown in Table 5.

Note Ⅱ: When 100% of bottom ash is substituted

Ⅲ: 50% of bottom ash

a: Cement: Aggregate ratio 1: 3

b: Cement: Aggregate ratio 1: 4

The tertiary blending was performed by partially replacing or adding silica fume, blast furnace slag, desulfurized gypsum, and a fluidizing agent based on the proper mixing amount (wt%) obtained from the second blending design experiment and the mixing ratio of the molding conditions. To find a condition that can improve workability. The compounding ratio is shown in Table 6.

X) silica fume

y: blast furnace slag

v: fluidizing agent

z: Desulfurized gypsum (subsidiary material discarded at Boryeong Thermal Power Plant)

Specimen Molding

1 is a specimen molding process diagram for an embodiment of the present invention. All materials were weighed and blended.

After metering the material, the bibimbion was performed for 3 minutes on a bibim plate, followed by bibeam for 8 minutes with the addition of the mixing water, and the fluidizing agent was used after diluting the mixing water. In addition, the remaining sample during molding was stored by blocking the air to prevent evaporation of moisture.

The compaction for the production of specimens was carried out in two stages of compaction.

Molding was carried out using a compressive strength tester, the molding pressure was the first pressure molding at a pressure of 130 ± 1.3㎏ / ㎠ and then the mold was turned over and the second pressure molding at the same pressure. This was done to deliver even molding pressure to the specimen. After pressing, the solution was cured in a curing room at 22 ° C. for 24 hours (500 ° C.), and tensile strength was tested after 7 and 28 days.

exam

Specific gravity and water absorption of bottom ash

According to the provisions of KS F 2504 and KS F 2529, a certain amount of bottom ash is collected and dried until it reaches a constant volume (105 ℃ ± 5 ℃), absorbed in water between 15 to 25 ℃ for more than 24 hours, and then surface dried. Measured by drying until. The specific gravity and the water absorption were calculated by the following equation. The specific gravity was 2.1 and the water absorption was 2.0%.

In addition, the particles observed with the naked eye are extremely hard and have a cube shape with rough edges.

m 1: Weight after filling water to calibration curve of flask

m 2: Weight of sample + flask + water (with water removed to calibration curve after bubble removal)

ms 1: weight of dried sample

md 1: dry weight of the sample after m 2 measurement

Specimen Manufacturing

In the first experiment, based on the mixing ratio in the existing production process, only the sand and stone powder were used to change the mixing amount (wt%), and the tensile strength and the absorption were measured for 7 days and 28 days after the block was manufactured. This was done to compare when the ash was replaced with aggregate. In the second experiment, sand and stone powder were replaced with 50% and total bottom ash, and the C / S ratio was changed to prepare blocks. In the third experiment, after determining the optimal C / S ratio, mixing amount (wt%) and molding conditions based on the results obtained in the second experiment, silica fume, blast furnace slag, and desulfurized gypsum were added to reduce the amount of cement. Tensile strength and water absorption were measured, and fluidity was added to the concrete by adding a fluidizing agent to measure tensile strength and water absorption.

Tensile Strength and Absorption Rate Measurement

Tensile strength was selected by the Brazilian test method, and the test method is shown in FIG. 2. Six specimens were prepared per batch using a circular specimen mold of ψ70 mm × 140 mm.

Tensile strength was measured for 7 days and 28 days tensile strength, the pressure was measured at a pressure of 8 to 12kg / ㎠ per minute.

P : Pressure

d : diameter of specimen

l : length of specimen

Absorption rate was measured by drying the specimen at 100 to 115 ℃ for 24 hours or more according to KS F 4419 and then weighed after removing the surface water by immersing the specimen in water for 24 hours or more. The calculation method for measuring the water absorption of the specimen is as follows.

A: Saturation weight of the sample

B: dry weight of the sample

Tensile Strength and Absorption Rate Change

General aggregate application (1st test)

As shown in Table 7 and FIG. 3, the results of the experiments in the first compounding condition showed that the tensile strength increased as the mixing amount (wt%) increased, but the tensile strength enhancement width of the 7th to 28th day was not significantly different. The water absorption decreased as the amount of mixed water (wt%) increased. In general, when the mixing amount (wt%) is changed above the optimum mixing amount, the tensile strength increases even if the mixing amount increases to 30%. This phenomenon is considered because the bottom ash aggregate has a pozzolanicity, so it requires absorption to some extent.

Aggregate replacement of bottom ash (secondary test)

The results of the secondary formulation in which the aggregate was replaced with bottom ash are shown in Table 8 and Table 9 and FIGS. 4 to 9.

When 100% of the bottom ash was substituted, the tensile strength tended to be significantly lowered when the C / S ratio increased from 1: 3 to 1: 4. Absorption rate also increased with increasing C / S ratio. This can be said that the tensile strength is also reduced by reducing the amount of cement as a binder. Absorption rate seems to increase as the amount of bottom ash increases as the capacity of the bottom ash becomes porous and retains a large amount of water.

When 50% of the bottom ash was substituted, the tensile strength tended to decrease when the C / S ratio increased from 1: 3 to 1: 4, and the absorption rate increased as the C / S ratio increased. This is because the strength of sand itself is greater than bottom ash, and it is considered that cement content is so small.

On the other hand, when the bottom ash is 100%, the tensile strength enhancement width is larger than when the bottom ash is 50%. It is believed that bottom ash has a pozzolanic property and plays a significant role in enhancing strength.

6 to 9 show changes in tensile strength and water absorption according to the amount of mixed water (wt%) when the bottom ash is used at 100% and the bottom ash is used at 50%.

As shown in FIG. 6, when 100% of the bottom ash was substituted, the tensile strength gradually increased as the mixing amount (wt%) increased at a C / S ratio of 1: 3. However, the water absorption decreased as the amount of mixed water increased (wt%), and a constant water absorption curve appeared in the range where the amount of mixed water increased from 70% to 80%. As shown in FIG. 7, when the C / S ratio is 1: 4, the tensile strength also increases as the amount of mixture (wt%) increases, but the strength increase range is significantly larger than when the C / S ratio is 1: 3. As the mixing amount (wt%) increased, the strength enhancement width also increased. On the other hand, the water absorption was gradually lowered with the increase in the amount of mixed water (wt%) and the difference was slowed between 80% and 90%. It can be seen that this phenomenon also directly affects the increase and decrease of the strength depending on the cement content.

As shown in FIG. 8, when 50% of the bottom ash was substituted, the tensile strength increased as the mixing amount (wt%) increased even at a C / S ratio of 1: 3. Absorption rate also decreased as the amount of mixed water (wt%) increased, and the amount of mixed water (wt%) decreased with a gentle difference in the interval between 50% and 60%. As shown in FIG. 9, when the C / S ratio is 1: 4, the tensile strength is constantly increased as the mixing amount increases, and the absorption rate is lowered.

In the case where the C / S ratio is 1: 3 and 1: 4, the tensile strength increases as the mixing amount (wt%) increases, but the absorption rate decreases. It has the special characteristic of bottom ash, that is, pozzolanic, which is considered to increase strength in the long term.

When the C / S ratio is 1: 3, molding is not possible when the bottom ash is 100% substituted, when the mixing amount (wt%) is 90% or more and the bottom ash is 50% when the mixing amount (wt%) is 70% or more. It was. At the same time, when the C / S ratio is 1: 4, when the bottom ash is replaced by 50%, molding is impossible even when the mixing amount (wt%) is 80% or more. This is because the compounded water was separated due to the press molding. Therefore, as the molding pressure increases, the mixing amount (wt%) that can be molded is selected one by one under each condition by 10%.

Cement substitution of pozzolanic materials

In the third blending experiment, four types of sample numbers IIa-3, IIb-4, IIIa-2, and IIIb-3 were selected based on the results obtained in the second experiment. Here, the results of replacing 10% of the blast furnace slag and cement with silica fume and 1% of the fluidizing agent in the amount of cement are shown in Tables 10 to 12 and FIGS. 10 to 12.

In addition, in FIG. 13 to FIG. 16, the effects of the admixture on the tensile strength and the water absorption of each compound were compared. Silica fume exhibited higher tensile strength than that of other admixtures, while absorbance was higher. In the case of blast furnace slag replacement, the tensile strength was similar or lower than that of the absence of the admixture, but the absorption rate was lower than that of the other admixture and the addition of the admixture. In general, it can be seen that the addition of a small amount of pozzolanic material increases the tensile strength. This is thought to be the result of the continual hydration of the material with the cement.

As shown in Table 10 and FIG. 10, when 10% of cement was replaced with silica fume, tensile strength increased, but the effect of silica fume on strength was increased when C / S ratio increased from 1: 3 to 1: 4. Significantly reduced, did not significantly affect the strength. This phenomenon shows that even if the silica fume is activated pozzolanic, the appropriate cement material must be mixed. And the water absorption was increased than when the silica fume was not substituted.

As shown in Table 11 and FIG. 11, when 10% of the amount of basic cement was replaced by blast furnace slag (2.5%) at a ratio of 1: 3, tensile strength tended to decrease slightly. This strength is due to the large amount of bottom ash aggregate. However, when the same amount (2.5%) is substituted and the amount of bottom ash is properly mixed with sand to bottom ash in a ratio of 1: 1, the tensile strength is relatively increased. At the same time, the absorption rate is lowered to 10.4% by combining bottom ash and sand in a ratio of 14.3% when only bottom ash aggregate is used. Therefore, to use blast furnace slag as a cement substitute, it is necessary to at least adjust the amount of bottom ash and sand added. This phenomenon showed the same tendency as 1: 3 even if the cement: sand ratio was 1: 4.

As shown in Table 12 and FIG. 12, even when the C / S ratio was 1: 3 or 1: 4, when 1% of the fluidizing agent was added, the tensile strength increased with a constant slope regardless of the amount of bottom ash substitution. As a result, the water absorption was also decreased overall. This phenomenon is solved by minimizing the amount of additives and increasing fillability to the maximum of each particle due to fluidity. Therefore, it is thought that water absorption is also reduced since the amount of added water is minimized.

Desulfurization gypsum was selected from 5%, 10%, and 20% of cement by using the fluidizing agent with a C / S ratio of 1: 3 with good molding conditions, tensile strength, and water absorption rate and 70% of mixed amount (wt%). The results of the substitution experiments are shown in Table 13 and FIG. 17.

As shown in Table 13 and Figure 17, the tensile strength was changed when 1% of a 1: 3 compounding fluidizing agent was added and 5%, 10%, and 20% of the cement content was replaced with desulfurized gypsum. That is, when 5% of desulfurized gypsum was added, the tensile strength increased from 17.8 kg / cm 2 at the time of basic blending to 21.5 kg / cm 2. This is due to the reaction between cement and gypsum, and the amount of ethrinite produced increases, and also decreases with the effect of gypsum promoting hydration of C ₃ S (3CaO · SiO ₂ ) and C ₂ S (2CaO · SiO ₂ ). I think it improved. However, when 10% of desulfurized gypsum was added, the tensile strength decreased slightly to 20.3㎏ / ㎠, and when 20% of desulfurized gypsum was added, the tensile strength rapidly decreased to 13.0㎏ / ㎠. In the change of water absorption rate, the absorption rate decreased with increasing amount of desulfurized gypsum. The important result of this study is that this tendency is very different from the general phenomenon, namely the increase in strength and the decrease in absorption rate. Therefore, if only 5% of desulfurized gypsum is replaced with 1% of cement in the 1: 3 basic formulation, the tensile strength of about 20% is increased.

Brick manufacturing

1st test

Based on the results of the replacement of the bottom ash aggregate and the substitution test (tensile strength and absorption) of the pozzolanic material, four choices were made to actually manufacture the interlocking block. The amount of water was determined according to the mixing ratio so that these molding conditions were suitable, and the U-TYPE interlocking block was press-molded by a manual press. The amount of fluidizing agent below was 1% of the amount of cement. The compressive strength measurement results after curing (natural and steam) for 7 days and 28 days after molding are shown in Table 14 and FIG.

Looking at the primary and N ⁰ .1 N ⁰ .2 experiment appeared compressive strength of N ⁰ .2 a natural cure without the addition of desulfurization gypsum than N ⁰ .1 natural cure by adding 2.5% higher desulfurization gypsum was, N ⁰ .1 addition of desulfurization gypsum in the steam curing was higher as the difference between the compressive strength remarkable. If a stone dust from replacing some part of the cement in the case is replaced with silica fume by a bottom Ashton all exhibited a high compressive strength than N ⁰ .2. This is a phenomenon in which the compressive strength is increased by the development of hydration products of Calcium Silicate Hydrate (CSH) and Calcium Aluminate Hydrate (CAH) by active Pozzolan hydration of cement and silica fume.

2nd test

Block based on the primary results of the selection made by a relatively economical and has high formulation ⁽⁰ .1 N) strength cement amount and gradually changing the mixing quantities (wt%) and replaced with a desulfurization gypsum, flow agents ( 0.49%) was added to the cement to test the strength. The compounding ratio and compressive strength measurement results of this secondary test are shown in Table 15 and FIG.

The results of the compressive strength show that desulfurized gypsum is relatively increased while the amount of cement is constantly reduced, and when the amount of fluidizing agent is added from 1% to 0.49%, the amount of mixed water (wt%) is increased as the amount of desulfurized gypsum increases. (59.0%) was greatly reduced from 42.0 to 44.0%. In general, the 7- and 28-day compressive strengths were higher than those of natural curing in the case of steam curing, and the compressive strength was still increased when 28 days were cured in the 7-day strength. This result is thought to be the development of hydration material in the case of steam curing according to the hydration reaction. However, it can be seen that the compressive strength decreases as the amount of desulfurized gypsum increases with cement substitutes. This is helpful to the cement hydration reaction when the amount of desulfurized gypsum (2.5 to 5.0%), but it is thought that replacing the cement more than it does not significantly affect the cement hydration reaction. Therefore, when desulfurized gypsum is to be used as a cement substitute, an appropriate amount should be selectively used to meet the strength required for interlocking products.

3rd test

A secondary basis for production test block, select N ⁰ N ⁰ .1 and .6 to and different from the water and curing conditions were examined 7 and 28 day compressive strength and tensile strength.

As shown in Table 16, in general, the difference in strength is very significant depending on the amount of desulfurized gypsum added. Tensile and compressive strength of 10.0% desulfurized gypsum replaced by cement was reduced by more than 100% from that of 2.5% desulfurized gypsum. Therefore, in order to replace cement with desulfurized gypsum, it can be seen that 2.5 to 5.0% is an appropriate amount. When the cement is replaced with desulfurized gypsum, it can be seen that the strength is also changed by the amount of water added. The highest strength was at 42.0% than at 40.0%, and the strength was relatively decreased when the moisture was increased to 44.0%. Therefore, in order to obtain the best strength in the production process, it is absolutely necessary to control the optimum amount of water (Optimum Water Content). In both No.7 and No.8 combinations, 42.0% of water is the proper amount. The strength was also changed when desulfurized gypsum was replaced with cement and steam curing temperatures were increased to 60, 80 and 100 ° C. It showed the highest intensity expression at 60 ℃ and did not help the strength expression with increasing temperature. Therefore, Test No.1 interlocking block, which replaced cement with desulfurized gypsum and formulated bottom ash as aggregate, showed that KS F 4419 can be satisfied when steam curing temperature is controlled at 60 ℃ and moisture at 42.0%.

The above described concrete using bottom ash, an interlocking block manufactured using the concrete, and a method of manufacturing the same, but the concrete described in this embodiment is not only an interlocking block but also a raft block, a king block, a brick, a sleeper, It can be used for products that are molded as concrete such as fume pipes, poles and piles.

As described above, the present invention has an effect that a large amount of energy can be used without consuming much energy in order to use bottom ash, which is industrial waste discharged from a thermal power plant.

In addition, when the bottom ash is used as the aggregate of concrete, the concrete has the effect of achieving the absorption rate, compounding ratio, particle size, pressure, strength, etc. required by the building materials.

Claims (15)

Cement 18.0wt% or more, 22.5wt% or less, admixture 2.0wt% or more and 2.5wt% or less, aggregate 75.0wt% or more and 80.0wt% or less, and the mixing amount is 50wt% or more and 70wt% or less product. The concrete product according to claim 1, wherein the aggregate is sand and bottom ash, and wt% of sand and bottom ash is the same. The concrete product according to claim 2, wherein the admixture is blast furnace slag. The concrete product according to claim 2 or 3, wherein the mixing amount is blended at a rate of 50 wt%. 20.0 wt% or more of cement, 25.0 wt% or less, aggregate 75.0 wt% or more and 80.0 wt% or less, and 1% of a fluidizing agent is added to the blend, and the mixing amount is blended at a ratio of 50 wt% or more and 70 wt% or less. Concrete products 6. The concrete product according to claim 5, wherein the aggregate is sand and bottom ash, and the wt% of sand and bottom ash is the same. The concrete product according to claim 6, wherein the mixing amount is blended at a rate of 50wt%. A concrete product comprising at least 22.5 wt% of cement and at most 23.75 wt%, at least 1.25 wt% of admixture, at least 10.0 wt% of aggregate, and at least 75.0 wt% of aggregate. The concrete product according to claim 8, wherein the admixture is desulfurized gypsum and the aggregate is bottom ash. 10. The concrete product according to claim 9, wherein the fluidizing agent is 0.49%, and the mixing amount is blended at a ratio of 42.0 wt% or more and 44.0 wt%. 10. The concrete product according to claim 9, wherein the cement is 22.5 wt%, the desulfurized gypsum is 2.5 wt% or more and 7.0 wt% or less, and the mixing amount is 40.0 wt% or more and 44.0 wt%. 12. The concrete product according to claim 11, wherein the mixing amount is blended at a ratio of 42.0 wt%. The concrete product according to claim 8, wherein the admixture is silica fume, the aggregate is stone powder and bottom ash, and the wt% of the stone powder and bottom ash is the same. 22.5wt% of cement, 2.5wt% of desulphurized gypsum, 5.0wt% or less, bottom ash 75.0wt%, and after adding 0.49% of fluidizing agent, it is molded into a shape that requires concrete mixed with 42.0wt% of water. And, the concrete product, characterized in that the molding was steam cured at a temperature of 60 ℃. 22.5wt% of cement, 2.5wt% of desulphurized gypsum, 5.0wt% or less, bottom ash 75.0wt%, and after adding 0.49% of fluidizing agent, it is molded into a shape that requires concrete mixed with 42.0wt% of water. And a step of steam curing the molded article formed in the process to a temperature of 60 ℃.