KR101074770B1 - The functional concrete block for side walk using recycling material - Google Patents

Abstract

The present invention relates to a functional concrete sidewalk block using recycled materials, cement, crushed fine aggregate, sand, admixtures, back cement, ground aggregate, crushed glass powder on the base layer of the sidewalk block formed of a concrete block composition composed of water hardening reaction water At least one photocatalyst powder selected from bauxite powder or waste alumina powder, waste sludge photocatalyst, coated sludge photocatalyst, anatase, coated anatase powder, at least one ore powder selected from dolomite The present invention relates to a functional concrete sidewalk block using a recycled material which is molded into a mortar mixed with water-cured reaction water to a block surface layer composition composed of a admixture.

Description

The functional concrete block for side walk using recycling material}

The present invention relates to a concrete block using recycled materials. Specifically, cement, crushed fine aggregate, sand, admixture, back cement, back cement, fine aggregate, crushed glass on a base block base layer formed of a concrete block composition composed of water hardening reaction water. Powder and bauxite powder or waste alumina powder and at least one photocatalyst powder selected from waste sludge photocatalyst, coated waste sludge photocatalyst, anatase, coated anatase powder, dolomite, biotite, janghoseok The present invention relates to a functional concrete sidewalk block using a recycled material formed by adding a hardening reaction water to a block surface layer composition composed of a powder and a admixture and molding it into a mortar mixed with it.

It has the characteristics of cement concrete strength, durability, waterproofness, formability, etc., and it is advantageous in economic aspect, and occupies most of the buildings, apartments and other civil and building structures in Korea. As such, cement concrete is in a position to be usefully used as a civil construction material in the future. However, from the environmental point of view, cement syndrome, which occurs in offices or apartments, especially concrete structures, is emerging, and it can also be a disadvantage in terms of water, air, environmental circulation system, landscape restraint and habitat space. Along with the deterioration of air and water quality caused by the rapid growth of the industry, it is acting as an important factor to destroy the environment when waste is thrown away as a byproduct of daily life. For example, sludge produced during domestic wastewater treatment in 2004 is known to be about 2.4 million tons, of which only about 10% is recycled into solid fuel or fuel gas (methane gas).

In this situation, it is urgent to create various functions that can reduce the environmental load caused by cement concrete as well as the environmental load caused by other factors.

More specifically, there are various functions such as introducing waste materials into concrete to have resource recyclability functions, concrete itself to have vegetation water purification and atmospheric purification functions, or to give natural beauty to consider landscape or reduce cement syndrome. It is required.

In Japan's Okano concrete, such as the above-mentioned conventional products, charcoal-contained concrete water pipes and plants are planted by Joan Bloc, and charcoal-containing concrete has porosity. Water pollution indicators such as oxygen demand and total phosphorus have been reduced to less than half, and Chiba Concrete, Japan, produces functional eco concrete. This product has vegetation and water permeability, but no mention of direct water purification.

Japanese Laid-Open Patent Publication No. 1997-328734 describes a technique for a concrete secondary product with a vegetation function, but since this product is not a concept of removing water pollution but a concept of simply adsorption, no purification function by decomposition space is mentioned. .

In addition to the prior art related to the domestic publications related to the present invention,

Korean Registered Patent Publication (Registration No. 10-089401) introduces "concrete structure using pine stone", which is cluster stone aggregate, portland cement and tricalcium aluminate, tricalcium silicate, calcium sulfoaluminate and calcium It refers to concrete structure formed from concrete composition composed of high strength cement composed of silicate component. It refers to the property of easily absorbing and filtering moisture because it is a porous material, but it does not mention the decomposition and purification function of pollutants by photocatalytic function. .

As a prior art, Korean Patent Laid-Open Publication No. 2010-18122 relates to an "environmentally friendly porous vegetation concrete composition", which is used to manufacture a revetment block or vegetation block for stabilizing the surface of a lake or coastal revetment block or road. Porous vegetation concrete composition is a porous vegetation concrete product foamed with cement, vegetable foaming agent, cationic adsorbent, plant growth accelerator, cryoprotectant composition, and porous composition that facilitates plant growth by facilitating drainage and drainage by porous composition. Although there is a function, this invention also does not mention the function of decomposing and removing harmful substances or pollutants, the foamed porous body is weak in the strength of the concrete structure.

The present invention effectively saves the material of the expensive functional surface layer by effectively constructing the cement concrete sidewalk block structure with a strong base layer and a functional surface layer, and is obtained from waste glass, waste alumina and flocculant for water treatment. By using the photocatalyst contained in the waste sludge, it can be competitive in recycling the resources of the waste, reduce the environmental load, and also use waste alumina which is generated as a defective product in each process when manufacturing alumina as bauxite or bauxite. Therefore, by forming a surface layer of high hardness, it has excellent abrasion resistance and can greatly extend the life of the sidewalk block, and in addition, functional concrete using recycled materials that can give a pleasant atmosphere by adding mineral powder having far-infrared radiation function. Also it relates to a block.

White cement, fine aggregate, crushed glass powder and bauxite powder or waste alumina powder and waste sludge photocatalyst powder, coated waste sludge on the base layer of the sidewalk block formed of cement concrete composition composed of cement, coarse aggregate, fine aggregate and admixture Atmospheric and water purification functions by forming a block surface layer with a functional concrete composition composed of one or more photocatalyst powders selected from photocatalytic powder, anatase powder, and coated anatase powder, dolomite, sericite, and Jang Hoseok. The problem of the present invention was achieved by providing a functional concrete block using recycled materials, which are endowed with wear resistance and far infrared radiation.

According to the present invention, it is possible to secure competitiveness by reducing waste glass crushed powder waste alumina powder and waste sludge and photocatalyst powder recycled as surface layer composition, and to reduce environmental load and functionally purify the water. It can be called eco-friendly by being given clean-up function and far-infrared radiation function, and it can be called functional concrete walkway block using recycled material that can improve durability while having excellent wear resistance.

The present invention relates to a functional concrete walkway block using a recycled material having a multi-functional concrete specifically, 180 to 230 parts by weight of shredded aggregates, 150 to 180 parts by weight of sand, admixture 2 to 3 parts by weight, water hardening 25 parts by weight of back cement, 57 parts by weight of fine aggregate, 6.5 parts by weight of crushed glass powder, 4 parts by weight of bauxite powder or waste alumina powder on the base block formed of concrete foot block composition composed of 20 to 50 parts by weight of reaction water. 4 parts by weight of at least one photocatalyst powder selected from waste sludge photocatalyst powder, coated waste sludge photocatalyst powder, anatase powder and coated anatase powder, at least one ore powder selected from dolomite, sericite and janghoseok 2.5 parts by weight , To form the surface layer with a mortar mixed with 10-15 parts by weight of the water curing reaction water to the concrete block surface layer composition composed of 1 part by weight of admixtures It relates to a concrete sidewalk using recycled material which is to layer.

Another embodiment of the present invention may be press-molded by uniformly spraying the functional concrete walkway surface layer composition powder on the foundation layer in forming the surface layer.

The sidewalk block type is applied to the square sidewalk brick brick sidewalk block and other various sidewalk blocks. The thickness of the functional surface layer is 1/5 to 1/10 of the thickness of the base layer of the sidewalk block. . Such thickness is not limited and may be applied in some cases.

In the above method, it is easy to express various colors on the surface layer by using the back cement for the surface layer.

In addition, in order to obtain a smooth surface, the base layer and the surface layer of the sidewalk block of the present invention use coarse aggregates without using coarse aggregates, but replace each of the mineral powders by replacing the shortages of fine aggregates with crushed glass powder or ore powder as in the above composition. The composition is designed to exert the function of.

Looking at the functionality and properties of each composition,

The crushed glass powder has the purpose of improving the wear resistance by improving the hardness of the block surface layer, which is easily worn out along with the boulite ore powder waste alumina powder.The glass powder is collected at a hardness of 5 to increase the surface hardness to give abrasion resistance. Although there is also an object, it is more important to increase the absorbance of the photocatalyst described later due to transparency and diffuse reflection.

The bauxite fine powder used here is calcined powder and contains 65% or more of α-alumina, and has a high wear resistance with a hardness of 7 to 7.5, and the bauxite is a hydrous alumina mineral, which is a diaspore burmite or hydride. It is not only a mixed mineral of hydrated alumina minerals such as lazirite, but also contains impurities such as silica and iron oxide. In the firing process, about 14% of crystal water is lost between 300 ° C and 500 ° C, and the remaining crystallization water is lost again above 500 ° C.

The first dehydration is mainly caused by the diaspore and burmite, and the alumina partially contained in the γ-Al ₂ O ₃ state in the range of 900 ° C. to 1070 ° C. is transferred to α-Al ₂ O ₃ , further raising the temperature. Α-alumina increases, increasing to 1600 ° C. The hardness increases due to the α-alumina content.

In addition, the waste alumina used as the block surface layer composition refers to alumina calcined alumina generated by defects in each process of manufacturing alumina raw material as bauxite, and such waste alumina has an average of 85% of α-Al ₂ O _3. It has a high hardness up to 8 ~ 8.5 with abrasion resistance (cm3) of 0.33 and very good wear resistance.

Thus, alumina is known to be the hardest among the metal oxides (ceramics).

The bauxite powder or waste alumina powder can be fired at 1500 ~ 1600 ℃ for 1 hour in powder form to ensure high hardness.

The waste sludge photocatalyst powder in the composition is calcined (700 ~ 800 ℃) by drying the sludge in which titanium chloride used as flocculant in water and wastewater treatment forms floc with colo abnormal solids and suspended solids in water. While treating the organic matter in the sludge by combustion, the chlorine is decomposed, scattered and oxidized by high heat, so that the impurity-containing photocatalyst (TiO ₂ ) is obtained and wet milled to use the waste sludge photocatalyst powder as a surface layer composition. 18 wt% of this catalyst powder was added to a coating solution containing 10 wt% to 25 wt% of sodium or potassium silicate and 2 wt% of a silane capping agent. Sludge photocatalyst powder.

When the heat treatment temperature is processed at a high temperature, the drying solidification time is fast, and at low temperatures, the time required for drying solidification is long. Suitable temperature is 200 ± 10 ℃.

Such a photocatalyst powder has a structure in which the photocatalyst powder particles are coated in whole or in part with a glass film. Originally, photocatalysts do not have the ability to decompose organic matter without light. However, the coating layer of water glass or silane capping agent used as the composition is transparent materials with excellent light transmittance, and thus does not inhibit the photocatalytic function, and thus has excellent organic material decomposition function, thereby having water quality and air purification function, and desorption of the photocatalyst particles from the surface layer. And anti-pollution at the same time. In addition, the silane capping agent has a strong adhesive force to strongly bond the photocatalyst particles with the coating layer, the base layer and the surface layer.

In addition, as a composition, anatase powder is titanium ore, which is anatase-type titanium ore whose main component is titanium oxide and which has a strong organic matter decomposition function by light energy. This ore powder can also be used as a block surface composition in powder form, and can be used coated anatase powder pulverized by coating with glass in the same manner as described above.

Dolomite, sericite, and Jang Hoseok powders are all ore powders that emit at least 93% of far-infrared rays, and are ore powders that can replace fine aggregates or fillers in the block surface layer composition. And lignin sulfonate is used as a admixture.

In addition, crushed glass powder, photocatalyst powder, anatase and waste alumina powder use fine powder of particles having an average distribution of less than 300 mesh.

In order to determine the function of the surface layer of the present invention, the block was prepared as an example.

About 25 parts by weight of cement, 57 parts by weight of fine aggregate, 6.5 parts by weight of crushed glass powder, 4 parts by weight of waste sludge photocatalyst powder, 4 parts by weight of waste alumina powder, 2.5 parts by weight of dolomite powder, 1 part by weight of admixture A specimen of 5 × 5 × 1 cm was prepared with mortar to which 10 parts by weight of water curing reaction was added, and the resultant was cured for 30 days. In the same manner, the same size specimens were prepared in the same manner using anatase powder instead of the waste sludge photocatalyst. The former specimen is referred to as A, and the latter specimen is referred to as B.

In order to determine the decomposition rate, deodorization function, and abrasion resistance of acetaldehyde by the water purifying function gas bag B method using the specimens A and B, the results of the experiments were shown.

Water Purification Assessment.

In water purification experiment, test sample A and B were filled with 30ℓ of contaminated water contaminated with organic substance in transparent container such as glass container or acrylic container, immersed in 15 test specimens, and closed by closing the lid, and the temperature was 20 ± After standing for 10 days while maintaining the temperature of 1 ℃, the water quality was evaluated to obtain the results shown in Table (1).

Water Purification Assessment Table. Category＼Item COD (mg / l) T-N (mg / l) T-P (mg / ℓ) Initial concentration 10 days pass Initial concentration 10 days pass Initial concentration 10 days pass A 184.8 85.8 16.6 10.8 4.4 0.7 B 184.8 87.1 16.6 11.3 4.4 0.81

Compared with the specimen (A) with the waste photocatalyst powder, the specimen (B) with the abutment powder was slightly degraded, but the chemical oxygen demand, total nitrogen, and total phosphorus in the sewage were both excellent. .

Specimen Of (A) and (B) Gas bag Acetaldehyde by B method Degradation Rate Evaluation .

In order to evaluate the atmospheric purification, the decomposition performance of acetaldehyde was evaluated by irradiating ultraviolet rays for 20 hours according to the gas bag B method proposed by the Korean Photocatalyst Association. 20 specimens were placed in a 10-l gas bag, and 6 liters of acetaldehyde / air mixed gas were allowed to equilibrate with acetaldehyde concentration for 20 hours with UV light having a wavelength of 10mw / ㎠ and UV-A. By examining the change of acetaldehyde concentration, the decomposition rate of acetaldehyde of photocatalyst was examined as shown in Table (2).

Acetaldehyde decomposition rate by gas bag B method of specimen (A). Category＼Item Initial concentration
(ppm) 2 hours later
Concentration (ppm) After 10 hours
Concentration (ppm) After 20 hours
Concentration (ppm) Removal rate
(%) Specimen A 126 55 14.7 0.7 99.4 Specimen B 126 71.4 24.8 2.4 97.7

As shown in Table 2, the acetaldehyde decomposition rate of the specimen (B) is slightly lower than that of the specimen A, but the acetaldehyde decomposition ratio of the specimen A or B is excellent.

Specimen  Evaluation of deodorization test of ammonia gas.

In order to evaluate the deodorizing function of specimens (A) and (B), the experimental results in the dark room using ammonia gas according to KICH-FIR-1004 range are shown in Table (3).

Evaluation of deodorization test of specimens. Division / Hour (minutes) Change in concentration (ppm) over time Deodorization rate (%) 0 30 60 90 120 150 Specimen (A) Initial concentration
(ppm) 99 56 23 11 5 96.3 Specimen (B) 136 101 58 26 13 7 94.8

Comparing the results of the deodorization test of specimen A and specimen B, the deodorization rate is almost the same, and the result of deodorization rate is mainly due to the photocatalytic decomposition function of the waste photocatalyst or the titanium oxide of anatase, although there may be a sensitivity of the deodorization rate by adsorption of the surface layer. I guess.

Specimen  Wear resistance evaluation.

In order to evaluate the abrasion resistance of the specimen (A) is composed of 100 parts by weight of cement, 200 parts by weight of crushed fine aggregate, 160 parts by weight of sand, 2 parts by weight of admixture, 40 parts by weight of hydrocuring reaction water. The composition (C) was prepared in the same shape and size as the specimen (A).

Wear test of each specimen was carried out by the method described in KS F 2813. Abrasion resistance test was carried out by installing the Taber wear mold, applying the pressure to the wear mold, and applying pressure to the specimen.

The wear resistance was evaluated by measuring the weight before and after the wear of the specimen by the wear rate and using the difference. The results are shown in Table (4).

Evaluation of abrasion resistance of specimen (A) and specimen (C). Specimen Specimen (A) Specimen (C) Weight before test (g) 302.6 311.2 Weight after test (g) 289.6 292.4 Wear loss (g) 13 18.8 Wear rate (%) 4.3 6.02

It can be seen that the wear rate of the specimen (C) is much larger than the wear rate of the specimen (A) as shown in Table (4), which can be referred to as a conventional sidewalk block surface compared to the sidewalk block The specimen (A), which is the surface layer, is caused by the composition of waste glass powders having a hardness of 5 to 7, and a bauxite powder having a hardness of 7 to 7.5, and waste alumina powder having a hardness of 8 to 8.5. It can be said to be an effect.

As described above, the surface layer of the sidewalk block of the present invention has a crystallization function by reducing chemical oxygen demand, total phosphorus and total nitrogen in sewage, and decomposes acetaldehyde, which is an organic substance, and has an excellent wear resistance. Therefore, it can be said to be a functional concrete block using recycled materials that can improve durability and, in addition, have a far-infrared radiation function and create a pleasant atmosphere.

Claims (6)

100 parts by weight of cement, 180 to 230 parts by weight of shredded aggregate, 150 to 180 parts by weight of sand, 2 to 3 parts by weight of admixture, and 20 to 50 parts by weight of water hardening reaction. Part by weight, fine aggregate 57 parts by weight, crushed glass powder 6.5 parts by weight, waste sludge photocatalyst powder, coated waste sludge photocatalyst powder, anatase powder, coated anatase powder 4 parts by weight, bauxite 10-15 parts by weight of hydrocuring reaction water is added to the concrete foot block surface layer composition composed of 4 parts by weight of powder or waste alumina powder, dolomite, cerasite, and at least one ore powder selected from dolomite, and 1 part by weight of admixture. Functional concrete sidewalk block made of recycled material formed by mixing the surface layer of the sidewalk block with mixed mortar. The method of claim 1, the waste sludge photocatalyst powder is dried sludge containing titanium chloride used as flocculant in water or wastewater treatment and calcined at a temperature of 700 ~ 800 ℃ to burn off organic matter and at the same time decompose chlorine Functional concrete block using recycled material, characterized in that the waste sludge photocatalyst obtained by the wet decomposition of the photocatalyst (TiO ₂ ) is removed by oxidation. The method of claim 1, wherein the coated waste sludge photocatalyst powder is homogenized by adding 18 wt% of the waste sludge photocatalyst powder and 2 wt% of the silane capping agent to 80 wt% of an aqueous solution of 10 to 25 wt% of sodium silicate or potassium silicate, followed by heat treatment for drying and solidification. Functional concrete block using recycled material, characterized in that the powder is a pulverized solidified. The method of claim 1, wherein the bauxite powder is a functional concrete block using a recycled material, characterized in that the fine powder obtained by pulverizing the bauxite powder at a temperature of 1500 ~ 1600 ℃ 1 hour. The method of claim 1, wherein the coated anatase powder is homogenized by adding 18 wt% of anatase powder and 2 wt% of a silica spring agent to 80 wt% of an aqueous solution of 10-25 wt% of sodium silicate or potassium silicate, followed by heat treatment to dry solidify the solid. Functional concrete block using recycled material, characterized in that the fine powder pulverized. The recycled material according to claim 1, wherein the waste alumina powder is a poor alumina powder generated during the production of alumina as bauxite, and the powder is a fine powder obtained by pulverizing the powder for 1 hour at a temperature of 500 to 1600 ° C. Functional concrete block using.