KR20100070501A - A water-retentive bottom ash block and its process of manufacture - Google Patents

Abstract

PURPOSE: A bottom ash water-retaining block and a method for manufacturing the same are provided to have water-retaining function on a walk road by mixing binding agent, strength enhancer, and vegetable admixture. CONSTITUTION: A method for manufacturing bottom ash water-retaining block comprises: a first step of dividing bottom ash aggregate through sieving separation test; a step of inputting bottom ash aggregate, binding agent, vegetable admixture, and water to obtain bottom ash mixture; a step of inputting the bottom ash mixture to a mold to mold a block; and a step of plasticizing the water-retaining block. The bottom ash water-retaining block contains 5-30 weight% of binding agent based on 100 weight% of aggregate and 1-10 weight% of vegetable admixture based on the binding material.

Description

Bottom ash conservative block and its manufacturing method {A water-retentive bottom ash block and its process of manufacture}

The present invention relates to a bottom ash conservative block and a method for manufacturing the same, and more particularly, to a bottom ash conservative block having a conservative function by mixing a binder, a strength enhancer and a vegetable admixture with a bottom ash aggregate.

In general, the sidewalk blocks are arranged in series to face each other in order to pave the sidewalks such as sidewalks, sidewalks and residential complexes, plazas, parks, parking lots, etc. in consideration of the city view and convenience of walking. Such sidewalk blocks are used in various forms and purposes. However, the rapid urban development not only causes tropical nights due to the urban heat island phenomenon and increases the health damage due to heat severity, but also acts as an influencing factor of urban flooding and air pollution. It is urgent. At present, the global heat island phenomenon caused by global warming is causing serious environmental and health problems.In the United States, Germany, and Japan, the urban and residential areas of urban residents and road users Many studies are being conducted or conducted on buildings and pavement.

On the other hand, the conventional press plate or block currently used in the market is mainly do not let the water pass, the permeable plate using the principle of allowing water to permeate the ground by increasing the gap between the plate and the plate is also proposed. However, in the case of the water permeable plate, not only is it inconvenient to pass due to the wide gap, but also has a very limited function of evaporating moisture. In addition, when paving a sidewalk with pitched concrete or pitcher ascon, when a part of the water, electricity, and other sidewalks need to be cut, the restoration of the sidewalk after construction is difficult and inconvenient, and the original beauty is lost after the restoration work.

As another example, the proposed conservative block can prolong the road surface temperature suppression effect by using green areas such as grass around or by installing a water storage device on the subbed of the block to smoothly transfer the accumulated moisture from the green area or the device to the block. However, blocks made of concrete are excellent in terms of strength, but have a disadvantage of causing harmful pollution and causing environmental pollution. In addition, blocks using loess, clay, etc. have the disadvantage of increasing the manufacturing cost through the use of thermal energy during the firing process during the production process. In addition, the installation of the water storage device in the lower part of the block increases the construction period, resulting in excessive construction costs, as well as impairing the safety concerns as the support capacity of the block lower space is reduced.

Accordingly, the present invention has been proposed in order to solve the above-mentioned problems, a bottom ash conservative block and a method of manufacturing the same that can prevent the heat island phenomenon of the road by facilitating moisture penetration while maintaining the strength as a sidewalk block. The purpose is to provide.

The present invention for achieving the above object, the first step of dividing the bottom ash aggregate by particle diameter aggregate through a sifting test; A second step of preparing a bottom ash mixture by adding the bottom ash aggregate, a binder and a vegetable admixture to increase the absorption rate, and water; Inserting the bottom ash mixture into a mold for manufacturing a block to form a block; And a fourth step of curing the bottom ash conservative block generated through the three steps.

Here, the second step is characterized in that the strength enhancer is further added.

In addition, the present invention is prepared through the above production method, but with respect to 100% by weight of the bottom ash aggregate, 5 to 30% by weight of the binder is mixed, with respect to 100% by weight of the binder, 1 to 10% by weight of vegetable admixture It provides a bottom ash conservative block cured after molding the bottom ash mixture mixed into a block.

In this embodiment, 1 to 20% by weight of strength enhancer may be further added to 100% by weight of the binder.

According to the present invention, by using the bottom ash as aggregate (coarse aggregate, coarse aggregate) can solve the shortage problem of natural aggregate, and reduce the landfill cost and increase the landfill due to the increase in the amount of coal ash generated as industrial by-products in coal-fired power plant Has the effect of solving the problem of marine environment and ecosystem destruction.

In addition, the present invention has another effect that can increase the performance of the water retention block by increasing the water retention capacity of the block itself through the fine pores of the bottom ash aggregate itself.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3.

Bottom ash conservative block and its manufacturing method according to the present invention to solve the problem of the existing resources by manufacturing the bottom ash, which is an industrial by-product as a block, and to impart functionality to facilitate the water permeation and absorption to the block itself to suppress the heat island phenomenon of the road It is implemented so that

In the embodiment of the bottom ash water-retaining block according to the present invention, with respect to 100% by weight of bottom ash, which is generated as an industrial by-product in a coal-fired power plant and has a porous characteristic, 5 to 30% by weight of the binder is mixed, and 100% by weight of the binder. 1 to 20% by weight of strength enhancer and 1 to 10% by weight of vegetable admixture for enhancing water absorption, and molded into blocks to cure.

The conservative block manufactured by combining the above components is mainly applied to parks, sidewalks, driveways, etc., and can be used as any construction civil engineering material that can be applied to a part that requires the effect of permeability and repair.

In the present invention, the mixing ratio of the bottom ash aggregate is determined in consideration of the use place, required strength, and functionality.

In a preferred embodiment, the bottom ash aggregate is mixed with aggregates by particle diameters obtained through a sieving at a predetermined ratio. At this time, the bottom ash aggregate is mixed with the binding material aggregate aggregated by a predetermined ratio of particles for each particle size obtained through the sieving.

The bottom ash aggregate is divided by the particle size of 5mm or more (A aggregate), 2-5mm (B aggregate), 850㎛ ~ 2mm (C aggregate) size through a sieving. As the bottom ash aggregate according to an embodiment of the present invention, a mixture of at least one aggregate selected from 5 mm or more (A aggregate), 2 to 5 mm (B aggregate), and 850 μm to 2 mm (C aggregate) is used. .

Preferably, the mixing ratio of particle size of the bottom ash aggregate is A aggregate: B aggregate: C aggregate in a ratio of 1: 2: 1. The mixing ratio of the bottom ash aggregates by particle size was found to be the most suitable compounding ratio through the experiments on the strength and absorption of water and permeability through several experiments. In other words, the experimental results showed that the other ratio is insufficient in terms of strength, or lack of water absorption.

The binder is for facilitating bonding with the bottom ash, and usually includes at least one material of portland cement, back cement, sodium silicate, water glass. This binder is carried out the process of attaching the surface of the bottom ash aggregate and then using water. The binder is mixed at a ratio of 5% by weight to 30% by weight in order to maintain the voids in the block to the maximum. It is difficult, and when it is added more than 30% by weight, the strength is strong, but there is a problem of reducing the permeability or absorption performance as the voids in the block is reduced, and also to comply with the recent trend to refrain from using cement in the environmental aspect. to be.

The strength enhancer may include at least one material of limestone, gypsum, and quicklime. The strength enhancer has a property of expanding through reaction with water.

In view of these characteristics, the strength enhancer was added in a ratio of 1 to 20% by weight in this example. That is, in the case where the strength enhancer is added in less than 1% by weight, there is no effect of increasing the strength. In particular, when the mixing content of the binder increases, it is not necessary to increase the strength, so the minimum amount of the input ratio of the strength enhancer is about 1% by weight.

When the strength enhancer is added in an amount of 20% by weight or more, a phenomenon of breaking the structure of the block due to a lot of expansion may occur and the strength may drop sharply. In addition, since the strength enhancer absorbs moisture well during the initial blending, the amount of water used may increase. This will increase the amount of water in the cement. Eventually, if the water-repellent block composition itself is too thin, the aggregate surface cement on the upper part of the block flows down to the lower part, and the upper part does not form a bond between the aggregates, and the lower part causes the cement to build up and harden to pass water. Can be.

Peat moss is used for the vegetable admixture.

Peat moss has 16 ~ 24 times water absorption ability by weight ratio when dry and has about 5 ~ 10 times absorption ability than pearlite or zeolite. In addition, according to domestic and international reports that there is a heavy metal adsorption capacity, it can be used for the treatment of heavy metals when rainwater including heavy metals in the downtown area is absorbed. In general, the characteristics of the peat moss are as shown in Table 1 below.

division material pH Specific gravity (g / ml) Solid phase rate (%) Porosity (%) Absorption rate (%) Organic matter Pete Moss 5.0 0.12 12.3 87.7 616.9 Mineral
Pearlite 7.9 0.26 21.8 78.2 109.9 Zeolite 8.5 0.88 38.4 61.6 64.6

The peat moss is a material that is widely used for water absorption of soil for landscaping as a moss material. Therefore, unlike other inorganic materials that harden through the reaction with water, since it is a vegetable material, as the mixing amount increases, it causes a decrease in the strength of the block. However, in the embodiment of the present invention in consideration of the water-retaining function, in the embodiment of the present invention to set the preferred mixing ratio of the vegetable admixture to 1 to 10% by weight in order to maximize the water-retaining ability. At this time, when the vegetable admixture is mixed at less than 1% by weight, the water absorption rate of the block is reduced, and when mixed at 10% by weight or more, the strength is significantly reduced.

In the present invention, the strength enhancer and the vegetable admixture are presented with respect to the ratio of the binder added based on 100% by weight, but in order to clarify the present invention, the binder, strength enhancer based on 100% by weight of the bottom ash aggregate And the mixing ratio of the vegetable admixture.

That is, in this invention, it can also be 5-30 weight% of binders, 0.05-3 weight% of vegetable admixtures, and 10-15 weight% of water with respect to 100 weight% of bottom ash aggregates. At this time, 1 ~ 6% by weight of the strength enhancer is not necessarily to be added, depending on the ratio of the binder is added whether the strength enhancer.

Block diagram of the present invention composition by the above-described compounding ratio and the porosity is jinige about 20% to 30%, the permeability is 1.5 × 10 ^-1 as a ~6.6 × 10 ^-1 cm / sec for normal permeability block 1.0 × 10 ^- Very good compared to ¹ cm / sec. The water retention and water absorption of the block of the present invention having such physical properties are well shown in Experimental Example 2 below.

Next, a method of manufacturing the bottom ash repair block according to the present invention will be described with reference to FIG.

In the method of manufacturing a bottom ash conservative block according to the present invention, first, the bottom ash is divided by particle diameter through a sieve test. At this time, through the sieving is divided by particle size of 5mm or more (A aggregate), 2-5mm (B aggregate), 850㎛ ~ 2mm (C aggregate) size.

The A ash: B aggregate: C aggregate of the bottom ash divided by particle diameter as described above in a ratio of 1: 2: 1, and a binder is mixed therein to obtain a bottom ash aggregate. At this time, the binder is usually used at least one or more materials of portland cement, white cement, sodium silicate, water glass, the mixing ratio of the bottom ash and the binder is based on 100% by weight of the bottom ash, the binder 5 ~ 30 weight Mix%.

In addition, during the manufacture of the bottom ash aggregate, 1 to 10% by weight of phytmos, which is a vegetable admixture for increasing the water absorption with respect to 100% by weight of the binder, is mixed, and water is added thereto to prepare a bottom ash mixture. At this time, the mixing of the vegetable admixture is performed even after the bottom ash aggregate and the binder and the gun bibim so that evenly distributed water is added.

In order to enhance the strength of the bottom ash aggregate in the blending process, at least one or more strength enhancers of limestone, gypsum and quicklime may be further mixed according to the blending ratio of the binder, and the strength enhancer may be preferably added to 100 wt% of the binder. It can be added freely in the range not exceeding 20% by weight.

Next, the bottom ash mixture consisting of the composition of the above composition is added to a mold for manufacturing a block to form a block, and cured in a natural state for 7 to 30 days.

2 illustrates a structure of a bottom ash conservative block according to an embodiment of the present invention.

As shown in the figure, the bottom ash conservative block has a porosity of 25% or more because the binder is surrounded on the bottom ash aggregate surface, and a strength enhancer is included to enhance the strength of the lower ash due to the high porosity. On the other hand, the vegetable admixture Pitmos is distributed in the block to control the contaminants through the role of absorbing moisture and adsorption, ion transfer, etc. when the moisture penetrates.

Figure 3 shows the bottom ash conservative block surface temperature measurement results according to an embodiment of the present invention.

As shown in Fig. 3, the bottom ash conservative block surface temperature measurement result shows that the surface temperature of the asphalt pavement is 50 ° C. or higher during 3 days of continuous rain, while the surface temperature of the conservative block of the present invention is about 37 ° C. It has been shown to have a temperature reducing effect.

In the following experiments were carried out for the various formulations of the water-retaining block composition of the present invention, the experimental results are shown.

Experimental Example 1

In the case of 21C3A1D2, 7-day and 28-day compressive strengths were measured at 12.5 MPa and 15.1 MPa, respectively, indicating that the 7-day strength was about 80% of the 28-day strength. In accordance with the Korean Industrial Standard KS F 4004, it is found that it corresponds to class C bricks (compressive strength 8N / mm ² or more) using only plain aggregate.

Table 1 Example of compressive strength test unit (MPa)

Specimen
Age 7 days 28days B111C2A1 7.7 9.0 B122C2 A1 4.4 6.2 B112C2 A1 2.9 4.3 B121C2 A1 11.0 14.4 B121C2A1D2 10.2 12.3 B121C2A1D3 9.4 10.6 B121C2A1D4 6.7 8.1 B121C2A2D2 7.2 9.0 B121C3A1D2 12.5 15.1 B121C3A3D2 3.8 5.7

Experimental Example 2)

Test specimens using PITMOS (hereinafter referred to as 'PM') showed an average absorption rate of 16%, which showed a more than double increase in absorption rate. In addition, although the absorption rate is high, the compressive strength that meets the regulations is shown. On the other hand, as shown in the graph (Water absorption and volumn of water retention of block) of FIG. In the case of unmixed specimens, the water content was 0.13 to 0.17 g / cm3, whereas the water content was 0.22 to 0.26 g / cm3, which is suitable for the Japanese repair block standard of 0.15 g / cm3.

Experimental Example 3)

As a result of examining the water purification ability of PM, which is reported to have high adsorption capacity of various heavy metals by exchange, Cmplexation, surface absorption, etc., using polluted rainwater discharged through the road with turbidity change, The turbidity of the raw water (hereinafter referred to as FW) was 290 NTU, whereas the turbidity of the PM-injected test specimen (hereinafter referred to as BBPMW) was 6.11 NTU, indicating that 98% turbidity was removed very high. In the case of BBPM test specimens, As and Cr components were slightly higher than raw water, but other removal components were confirmed to have high removal rates. In particular, Hg, Mn and Pb was found to be almost 100% purified. On the other hand, PM is believed to be able to increase the water purification ability with excellent heavy metal adsorption by properly adjusting the pH of the block according to the report that the heavy metal adsorption is better when the pH is 4-5.

[Table 2] Water quality test result unit: mg / L

Sample FW BBPMW As 0.012 0.022 CD 0.006 0.002 Cr 0.081 0.085 Cu 0.111 0.024 Fe 16.120 0.188 Hg 0.012 0.000 Mn 0.688 0.005 Pb 0.125 0.000

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

1 is a flow chart showing a manufacturing process of the bottom ash repair block according to the present invention.

Figure 2 is a photograph showing the structure of the bottom ash conservative block according to the present invention.

Figure 3 is a graph showing the bottom ash conservative block surface temperature measurement results according to an embodiment of the present invention.

Figure 4 is a graph showing the measurement results of water absorption (volumn of water retention of block) of the conservative block.

Claims (21)

A first step of dividing the bottom ash aggregate into aggregates by particle diameter through a sifting test; Step 2 of preparing a bottom ash mixture by adding the bottom ash aggregate and the binder, a vegetable admixture to increase the absorption rate, water; Inserting the bottom ash mixture into a mold for manufacturing a block to form a block; And Step 4 curing the bottom ash conservative block generated through the step 3 Method of manufacturing a bottom ash conservative block comprising a. The method of claim 1, The bottom ash aggregate of the first step is divided by the particle size of 5mm or more (A aggregate), 2-5mm (B aggregate), 850㎛ ~ 2mm (C aggregate) size through a sieving Method for producing a conservative block. The method of claim 2, The bottom ash aggregate is at least one aggregate selected from 5 mm or more (A aggregate), 2 to 5 mm (B aggregate), 850 μm to 2 mm (C aggregate). Way. The method according to claim 2 or 3, The bottom ash aggregate is a method of manufacturing a bottom ash conservative block further comprising the process of mixing in the ratio of A aggregate 1: B aggregate 2: C aggregate 1. The method according to any one of claims 1 to 3, The second step is a method of manufacturing a bottom ash repairable block, characterized in that further participating in the strength enhancer. The method of claim 1, wherein The second step is A method for producing a bottom ash conservative block, characterized in that 5 to 30% by weight of the binder is mixed with respect to 100% by weight of the bottom ash aggregate, but is mixed at a ratio of 1 to 10% by weight of the vegetable admixture with respect to 100% by weight of the binder. The method of claim 6, A method of producing a bottom ash water-retaining block, characterized in that 1 to 20% by weight of the strength enhancer is further mixed with respect to 100% by weight of the binder. The method of claim 6, The binder is a manufacturing method of a bottom ash repairable block, characterized in that it comprises at least one material of ordinary cement, back cement, sodium silicate, water glass. The method of claim 7, wherein The strength enhancer is a method of manufacturing a bottom ash repairable block, characterized in that it comprises at least one material of limestone, gypsum, quicklime. The method of claim 6, The method of producing a bottom ash water-retaining block, characterized in that the vegetable admixture is peat moss. The method of claim 1, In the step 4, the bottom ash conservative block is a manufacturing method of a bottom ash conservative block, characterized in that it is dried for 7 to 30 days in a natural state. The method of claim 3, wherein The mixing ratio of the bottom ash aggregate is a manufacturing method of the bottom ash repairable block, characterized in that the mixing ratio is determined in consideration of the use place and the required strength, functionality. To 100% by weight of the bottom ash aggregate, 5 to 30% by weight of the binder is mixed, with respect to 100% by weight of the binder, vegetable ash admixture mixed in a ratio of 1 to 10% by weight of the bottom ash mixture after molding into a cured bottom Ash conservative block. The method of claim 13, Bottom ash water retaining block, characterized in that 1 to 20% by weight of strength enhancer is further added. The method of claim 13, The bottom ash aggregate Bottom ash conservative block, characterized in that consisting of at least one aggregate of at least 5 mm (A aggregate), 2 to 5 mm (B aggregate), 850 ㎛ ~ 2 mm (C aggregate) obtained by sieving . The method of claim 13. The bottom ash aggregate 5 mm or more (A aggregate), 2 to 5 mm (B aggregate), and 850 μm to 2 mm (C aggregate) are obtained by sieving, and the ratio of A aggregate 1: B aggregate 2: C aggregate 1 is obtained. Bottom ash conservative block, characterized in that the mixture. The method according to any one of claims 13 to 15, The binder is a manufacturing method of a bottom ash repairable block, characterized in that it comprises at least one material of ordinary cement, back cement, sodium silicate, water glass. The method of claim 13, wherein The strength enhancer is a method of manufacturing a bottom ash repairable block, characterized in that it comprises at least one material of limestone, gypsum, quicklime. The method according to any one of claims 13 to 15, The method of producing a bottom ash water-retaining block, characterized in that the vegetable admixture is peat moss. To 100% by weight of bottom ash aggregate, 5 to 30% by weight of binder, 0.05 to 3% by weight of vegetable admixture, and 10 to 15% by weight of water are mixed to prepare a block, the block having 20% to 30% of porosity and permeability coefficient. A bottom ash water ^- retaining block, having physical properties of 1.5 × 10 ^{−1 to} 6.6 × 10 ⁻¹ cm / sec. The method of claim 20, Bottom ash water retaining block, characterized in that 1 to 6% by weight of strength enhancer is further added.

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