KR102434761B1 - Concrete precast drainage trench using composite material comprising surface modified titanium dioxide photocatalyst and the manufacturing method thereof - Google Patents

Abstract

The present invention relates to a precast concrete waterway pipe using a composite material including a titanium dioxide surface modification photocatalyst and a manufacturing method thereof, and more specifically, to a precast concrete waterway pipe using a composite material including a titanium dioxide surface modification photocatalyst and a manufacturing method thereof, wherein recycled fine aggregate is coated with a composite material including a titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of TiO_2 widely used as a photocatalyst, and slurry including the coated recycled fine aggregate, cement and water is sprayed for coating to the surface of the grating of the concrete waterway pipe and the inner surface of the concrete waterway pipe, thereby allowing organic compounds including nitrogen salts, mold, bacteria and VOCs contained in sewage or rainwater flowing into the concrete waterway pipe to be primarily removed while flowing on the upper surface of the grating of the concrete waterway pipe and passing through a water-passing hole, and to be secondarily removed while flowing on the inner surface of the concrete waterway pipe to purify water.

Description

TECHNICAL FIELD [0002] Concrete precast drainage trench using composite material comprising surface modified titanium dioxide photocatalyst and the manufacturing method thereof

The present invention relates to a precast concrete waterway pipe using a composite material containing a titanium dioxide surface modification photocatalyst and a method for manufacturing the same, and more particularly, to a titanium dioxide doped with Ni and Cu on the surface of TiO ₂ widely used as a photocatalyst. A composite material containing a surface modification photocatalyst is coated on the circulating fine aggregate, and a slurry containing the coated circulating fine aggregate, cement and water is spray coated on the surface of the grating of the concrete conduit pipe and the inner surface of the concrete conduit pipe. Organic compounds including nitrogen salts, mold, bacteria and VOCs contained in sewage or rainwater flowing into the interior are first removed while flowing through the upper surface of the grating of the concrete water pipe and passing through the water hole, and the inner surface of the concrete water pipe It relates to a precast concrete waterway pipe using a composite material containing a titanium dioxide surface-modifying photocatalyst capable of purifying water by being secondary removed while flowing through the water, and to a method for manufacturing the same.

In general, an upper open water pipe or an upper closed water pipe is buried in the basement or ground of roads, civil works, buildings, etc. It is common to cover

In particular, the water pipe has been developed and used in various structures with various materials (eg, metal, concrete block, plastic synthetic resin, etc.) depending on the application place or size, and is directly constructed at the work site, but improves work productivity and constructs In order to save cost, waterway pipes standardized with metal, concrete, plastic synthetic resin, etc. are mass-produced in advance at the factory, and then assembled and constructed at the site.

Looking at the prior art related to the water pipe, Korean Patent No. 10-1170103 (registration date July 25, 2012) discloses that in a trench installed for drainage on the lowest floor of a building, a trench body in a channel shape with an open top as a whole ( 110); And, a plurality of supports 130 to support the trench body 110 from the bottom, the bottom is fixed to the floor drain plate (HD); Constructed to include, the trench body 110 has a mounting jaw 111 in which the upper end of one side is bent outward, and the height of the opposite side is higher than the side on which the mounting jaw 111 is formed. Prefabricated trench 100 As an example, the support 130 includes an upper support 131 in which a plurality of upper locking jaws 132 and an upper slot 133 are formed, and a lower support 135 in which a plurality of lower locking jaws 136 and lower slots 137 are formed. ), and a prefabricated trench 100 characterized in that it is composed of a bolt (B) and a nut (N) that are fastened through the upper slot 133 and the lower slot 137 is known.

In addition, in Korea Patent No. 10-1747821 (registration date June 09, 2017) to form a drainage channel at the bottom of the structure, a base member fixed to the bottom of the structure, vertically protruding from the center of the base member, and A level adjusting member having a length, a supporter including first and second stoppers coupled to the level adjusting member, a support portion through which the level adjusting member passes and located between the first and second stoppers, and a floor member and the floor and a side wall member connected to both ends of the member in a curved surface, wherein the bottom member and the side wall member are integrally formed and include a form that can be separated by being coupled to the support part at a distance, wherein the bottom member includes the side wall It is inclined with respect to the upper surface of the member, and the concrete poured on the lower surface of the floor member is inclined by the inclined lower surface of the floor member, and the formwork is separated from the support part when the concrete is cured, and the supporter and the support part is buried in the concrete and is not exposed, the side wall member is divided into a first part and a second part, the outer surface of the side wall member is inclined with respect to the upper surface, and according to the inclination of the side wall member, The side wall is also in an inclined state, and the part (C) where the side wall and the surface of the floor formed by pouring concrete are connected by the second part of the side wall member is in a inclined state.

In addition, in Korea Patent No. 10-1865749 (registration date June 01, 2018), the PC trench 100 is supported and the pedestal 10 is capable of being fixed by using an adjuster to adjust the slope up and down. In the above, the pedestal 10 is composed of a cross bar 11 supported in a direction orthogonal to the PC transistor and a vertical bar 12 supported in the same direction as the direction in which the PC transistor is placed, and of the cross bar 11 At both ends of the left and right sides, the adjuster is positioned to be exposed upward for ease of adjustment by left and right rotation, and a stopper 13 is provided in front of it to prevent the flow of the PC transistor, and the adjuster 20 is located on the floor It is located on the upper end of the fixed body 30 having the concave-convex surface 32 on the surface and is rotatable, and the angle can be freely adjusted when the lower end of the adjusting body 20 moves while idle inside the connection groove. A ball-shaped connection protrusion 21 is provided at the lower end of the adjuster so as to be adjustable, and the connection groove 31 formed at the upper end of the fixture to be engaged with the connection protrusion 21 can also be accommodated in a ball shape. PC trench level work pedestal is known, characterized in that made of a curved groove (31a) so that.

However, the water pipes of the prior art can expect a smooth drainage effect of rainwater or sewage flowing inside, but there is a problem in that non-point pollution in rainwater is discharged as it is, or pollutants in the sewage decay and generate odors. has a problem of not purifying the water quality and worsening it, but also has a problem of shortening the lifespan of the water pipe by corroding the inner surface of the concrete water pipe due to non-point pollution or contaminants.

In order to solve the above problems, the present applicant has a U-shaped cross section and a predetermined thickness and length, as in Korean Patent Registration No. 10-2215279 (registration date February 05, 2021), is configured to be adjacently connected, a grating seating end having steps formed in a predetermined depth and longitudinal direction from both upper ends to the inner bottom direction in order to seat and fix the grating on the; a drainage channel integrally formed in a U-shaped cross-section from the grating seating end in the longitudinal direction so that rainwater or sewage water can be drained therein; An embossed portion which is formed to protrude at one end and is inserted and fixed to an intaglio oriented at the other end that is adjacently connected; As a polymer concrete precast drainage trench comprising; a concave portion formed concavely at the other end to be inserted and fixed with an embossed portion formed at the one end connected adjacently, wherein the polymer concrete precast drainage trench is a coarse aggregate having a size of 5mm to 20mm 30-50 parts by weight, 1.2mm-5mm fine aggregate 15-25 parts by weight, blast furnace slag 5-10 parts by weight, fly ash 5-10 parts by weight, silica fume 2-7 parts by weight, water reducing agent 0.1-5 parts by weight, an inorganic binder comprising 5 to 10 parts by weight of water; 8 to 10 parts by weight of unsaturated polyester resin, 5 to 10 parts by weight of stone powder used as a reinforcing filler of the unsaturated polyester resin, 1 to 2 parts by weight of a curing agent added to cure the unsaturated polyester resin Part, 1.5 to 3 parts by weight of shrinkage reducing agent added to prevent cracking due to shrinkage of polymer concrete, and 1 to 2 parts by weight of crosslinking agent (Silane) added to increase chemical adhesion of polymer concrete an organic binder composed of; It is cured by pouring a polymer concrete mortar composition containing; a reinforcing fiber material containing 3 to 5 parts by weight of a steel fiber added to improve the tensile strength and elastic modulus of the polymer concrete into the mold, and the U-shaped cross section A porous filter for neutralizing and/or purifying contaminants in sewage water by alkalizing acid rain in rainwater flowing into the drainage channel is provided on the inner surface of the drain channel formed in the longitudinal direction, wherein the acid rain is alkalized to neutralize the porous filter is a porous filter mortar in which 60% by weight of a porous filler containing bentonite powder, porous feldspar powder, perlite powder and kaolinite powder in the same weight ratio, 20% by weight of sodium hydroxide alkalizer, and 20% by weight of lime powder with an appropriate amount of water is mixed with a certain thickness. After solidification in the form of plate block of has been patented.

In addition, as shown in Korean Patent Registration No. 10-2215278 (registration date of February 05, 2021), a plurality of trench body blocks having a U-shaped cross section and a predetermined length and connected adjacently; At the connecting portion where the plurality of trench body blocks are adjacently connected, connecting support fixing brackets for fixedly coupling while supporting the lower ends of both ends of the adjacently connected trench body blocks; a cover seating end formed of a material and formed in a predetermined depth and longitudinal direction from both upper ends to the inner bottom direction in order to seat and fix the cover on the upper portion of the trench body block; a drainage passage formed in the longitudinal direction in the inner center of the trench body block and integrally formed in a U-shaped cross-sectional shape from the cover seating end to drain rainwater or sewage; an embossed portion formed at one end of the trench body block and configured to fix the connection coupling with the other end of the trench body block to be adjacently connected; It is formed at the other end of the trench body block, and is configured to include; an intaglio for fixing the connection coupling corresponding to the embossed portions of the adjacently connected trench body blocks; Alumina cement, blast furnace slag, to suppress the generation of hydrogen sulfide gas by sulfate ions and microorganisms and to purify pollutants by the sustained-release TiO2 photocatalyst during the decay of rainwater or sewage stagnated inside the trench. a binder binder comprising powder, nickel slag powder and silica sand; a porous filler impregnated with a photocatalyst including a zeolite powder, a pearlite powder, a feldspar powder, and a kaolinite powder impregnated with a TiO2 photocatalyst in the porous pores; and water; a porous filter mortar layer is laminated to form a cured porous filter mortar layer, and the connection support fixing bracket includes a lower support portion for supporting the lower portions of both ends of the adjacently connected trench body block; Both side support portions formed in a shape that is bent to a predetermined height from both ends of the lower support portion in the upper direction to surround both end side portions of the trench body block; A drainage level adjusting member for adjusting the drainage gradient and level of the trench body block by integrally extending from both ends of the lower support in the outward direction of the both sides of the support; an extension piece extending from the a ball nut integrally formed with the extension piece and having a screw therein; a ball screw coupled to the ball nut and rotated forward and reverse to adjust the drainage gradient and level of the trench body block by lifting and lowering the ball nut; Polymer using industrial by-products with enhanced drainage gradient and level adjustment and enhanced pollutant purification function, characterized in that it includes; Developed and patented a concrete precast drainage trench coupling system.

However, in Patent No. 10-2215279 of the present applicant, it was impossible to reduce non-point contamination through a porous filter including bentonite powder, porous feldspar powder, perlite powder and kaolinite powder, but it was impossible to purify contaminants only with the porous filter. No. 10-2215278 uses a TiO2 photocatalyst to be impregnated into porous pores such as zeolite powder for purification of pollutants.

[Patent Document 001] Korean Patent 10-1170103 (Registration Date July 25, 2012) [Patent Document 002] Korean Patent Registration 10-1747821 (Registration Date: June 09, 2017) [Patent Document 003] Korean Patent No. 10-1865749 (Registration Date: June 01, 2018) [Patent Document 004] Korean Patent No. 10-2215279 (Registration Date: February 05, 2021) [Patent Document 005] Korean Patent No. 10-2215278 (Registration Date: February 05, 2021)

The present invention is intended to solve the above problems, and a composite material comprising a titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of TiO ₂ widely used as a photocatalyst is coated on the recycled fine aggregate, and the coated fine recycled aggregate, cement And nitrogen salts, mold, bacteria and VOCs contained in sewage or rainwater flowing into the concrete waterway pipe by spray coating the slurry containing water on the surface of the grating of the concrete waterway pipe and the inner surface of the concrete waterway pipe A composite containing a titanium dioxide surface modification photocatalyst capable of purifying the water quality by first removing organic compounds as they flow through the upper surface of the grating of the concrete water pipe and passing through the water hole, and secondary removal while flowing through the inner surface of the concrete water pipe An object to be solved is to provide a precast concrete waterway pipe using the material and a method for manufacturing the same.

In order to solve the above problems, the present invention is configured to be adjacently connected with a U-shaped cross section and a certain thickness and length, and a step in the inner downward direction from both upper ends to a certain depth and longitudinal direction from both upper ends in order to seat and fix the grating on the upper part a concrete water pipe body including the formed grating seating end; It is seated on the grating seating end, it is formed with a thickness and length corresponding to the depth and length of the grating seating end, and the upper surface forms a gentle V-shape in its width cross-section, and a plurality of circular or long hole-shaped water holes are provided. Concrete grating to be formed: In the precast concrete water pipe comprising: the concrete water pipe body after wet curing and mold demolding, the inner side and/or lower surface of TiO ₂ widely used as a photocatalyst Ni and Cu doping on the surface of A hardened coating surface is formed by spraying a slurry containing circulating fine aggregate, cement and water coated with a composite material containing a titanium dioxide surface modification photocatalyst, and the concrete grating is wet-cured and molded, and then on the upper surface. By spraying the slurry, a cured coating surface is formed, and organic compounds containing nitrogen salts, mold, bacteria and VOCs contained in sewage or rainwater flowing into the inside of the concrete water pipe flow through the upper surface of the grating of the concrete water pipe and flow through the water hole. A precast concrete waterway pipe using a composite material containing a titanium dioxide surface modification photocatalyst that is primarily removed while passing through, and is secondary removed while flowing through the inner surface of the concrete waterway tube to purify water quality.

The concrete water pipe body and the concrete grating are 20-30 parts by weight of ordinary Portland cement, 5-10 parts by weight of alumina cement, 30-50 parts by weight of coarse aggregate of 6mm-15mm, 15-25 parts by weight of recycled fine aggregate of 1-5mm size, Solving the problem of wet molding with concrete mortar comprising 5-10 parts by weight of blast furnace slag powder, 5-10 parts by weight of silica fume, 3-5 parts by weight of nano calcium carbonate, 0.1-1 parts by weight of high-performance AE water reducer and water do it by means

The concrete mortar is formulated by adding 5 to 10 parts by weight of MMA resin as a polymer for strength reinforcement as a means of solving the problem.

The titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of TiO ₂ is a mixture of titanium dioxide powder having a particle size of 3 to 5 μm and nickel powder and copper powder having a particle size of 0.2 to 2 μm, but the titanium dioxide powder: Nickel powder: Copper powder is mixed in a weight ratio of 10:1:1, and it is heat-fired at 1,300°C, and powdered to a particle size of 3-5 µm is used as a means of solving the problem.

The titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of TiO ₂ is ethanol (C ₂ H ₅ OH) 10 volume and acetic acid (CH ₃ ) with respect to 1 volume of titanium tetraisopropoxide (TTIP) solution. After mixing 2 volumes of COOH) (99.8 %), copper nitrate (Cu(NO ₃ )·6H ₂ O) (0.5 M) aqueous solution 5 volumes and nickel nitrate (Ni(NO ₃ )·6H ₂ O) (0.5 M ) By adding 5 volumes of aqueous solution, homogeneous stirring and ultrasonic treatment at room temperature, evaporation to dryness, and calcining for 5 hours in nitrogen furnace at 500 ° C.

The composite material comprising a titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of TiO ₂ is a mixture of titanium dioxide surface modification photocatalyst:cement:water in a weight ratio of 1:0.5:0.5 to 1 as a means of solving the problem. do

The slurry is a recycled fine aggregate coated with a composite material containing a titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of the TiO ₂ : cement : water in a weight ratio of 1:0.5-1:2-5. as a solution to

A means of solving the problem is to form an outlet opening and closing with a plug member detachable from the inside so that water can be drained and flowed into the ground on one side wall of the lower inner side of the concrete water pipe.

In addition, the present invention comprises the steps of preparing recycled fine aggregate classified into the size of silica sand No. 1 to No. 5 silica with an average particle size of 1 to 5 mm by crushing the waste concrete that is a construction waste; Preparing a composite material in which a titanium dioxide surface-modifying photocatalyst:cement:water is mixed in a weight ratio of 1:0.5:0.5 to 1 in which the surface of TiO ₂ is doped with Ni and Cu; mixing and coating the composite material while spraying the surface of the recycled fine aggregate to produce a recycled fine aggregate coated with the composite material; Ordinary Portland cement 20-30 parts by weight, alumina cement 5-10 parts by weight, 6mm-15mm coarse aggregate 30-50 parts by weight, 1-5mm fine aggregate 15-25 parts by weight, blast furnace slag powder 5-10 parts by weight, A concrete mortar composed of 5 to 10 parts by weight of silica fume, 3 to 5 parts by weight of nano calcium carbonate, 0.1 to 1 parts by weight of a high-performance AE water reducer, and water to be connected adjacently with a U-shaped cross section and a certain thickness and length. Constructed and seated on the grating seating end, and a concrete water pipe body including a grating seating end having a step in the longitudinal direction and a predetermined depth in the downward direction from both upper ends in order to seat and fix the grating on the upper part, the grating seating end depth and a concrete grating formed with a thickness and length corresponding to the length, the upper surface of which forms a gentle V-shape in a cross-sectional shape, and a plurality of circular or long hole-shaped water holes. curing and demolding; The composite material-coated circulating fine aggregate:cement:water 1:0.5-1:2-5 weight ratio is mixed with a slurry on the inner side and/or lower surface of the demolded concrete water pipe body and on the upper surface of the concrete grating. A method of manufacturing a precast concrete waterway pipe using a composite material containing a titanium dioxide surface modification photocatalyst, including a step of spraying and coating and curing it is a means of solving the problem.

A precast concrete waterway pipe using a composite material containing a titanium dioxide surface modification photocatalyst of the present invention and a method for manufacturing the same, a composite containing a titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of TiO ₂ widely used as a photocatalyst Sewage flowing into the concrete waterway pipe by coating the material on the recycled fine aggregate and spray coating the coated slurry containing the recycled fine aggregate, cement and water on the upper surface of the grating of the concrete waterway pipe and the inner surface of the concrete waterway pipe or Organic compounds including nitrogen salts, mold, bacteria and VOCs contained in rainwater flow through the upper surface of the grating of the concrete water pipe and are first removed while passing through the water hole, and are secondarily removed while flowing through the inner surface of the concrete water pipe. It has an excellent effect of purifying water quality.

1 is a cross-sectional view of a precast concrete water pipe of the present invention;
2 is a SEM photograph of nickel powder and copper powder particles used in the present invention;
3 is an EDX photograph of titanium dioxide surface-modified photocatalyst particles doped with Ni and Cu on the surface of TiO ₂ of the present invention;

Hereinafter, embodiments and/or drawings of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms, and is not limited to the embodiments and/or drawings described herein.

First, referring to [Fig. 1], the precast concrete waterway pipe using the composite material containing the titanium dioxide surface modification photocatalyst of the present invention has a U-shaped cross section and a certain thickness and length, and is configured to be connected adjacently and , Concrete water pipe body 20 including a grating seating end 14 having a step in the inner downward direction from both upper ends 11 to a predetermined depth and longitudinal direction in order to seat and fix the grating 10 on the upper portion; It is seated on the grating seating end 14, and is formed with a thickness and length corresponding to the depth and length of the grating seating end 14, and the upper surface forms a gentle V-shape with a wide cross-sectional shape, and a plurality of Concrete conduit pipe comprising: a concrete grating 10 in which a circular or elongated water hole 16 is formed, wherein the concrete conduit pipe body 20 is wet-cured and molded, then the inner side 12 and/or A composite material containing a titanium dioxide surface-modified photocatalyst doped with Ni and Cu on the surface of TiO ₂ widely used as a photocatalyst on the lower surface 13 is coated with recycled fine aggregate, cement and a slurry containing water to be hardened by spraying A coating surface is formed, and the concrete grating is wet-cured and molded, and then a cured coating surface is formed by spraying the slurry on the upper surface, and nitrogen salts, mold, , bacteria, and organic compounds containing VOCs are first removed while flowing through the upper surface of the grating 10 of the concrete water pipe and passing through the water hole 16, and secondary while flowing through the inner surfaces 12 and 13 of the concrete water pipe. It is removed and configured to purify the water quality.

Here, the concrete water pipe body 20 and the concrete grating 10 are 20-30 parts by weight of ordinary Portland cement, 5-10 parts by weight of alumina cement, 30-50 parts by weight of coarse aggregate of 6mm-15mm size, 1-5mm size Concrete mortar composed of 15 to 25 parts by weight of recycled fine aggregate, 5 to 10 parts by weight of blast furnace slag powder, 5 to 10 parts by weight of silica fume, 3 to 5 parts by weight of nano calcium carbonate, 0.1 to 1 parts by weight of high-performance AE water reducer, and water is molded with

In this case, it is preferable to use the recycled fine aggregate classified into the size of silica sand No. 1 to silica sand No. 5 having an average particle size of 1 to 5 mm by crushing the waste concrete, which is a construction waste.

In addition, the alumina cement is a fast-setting special cement that has calcium aluminate as a main component, and provides coarse strength, chemical resistance and fire resistance. In addition, in order to give the alumina cement initial expansion and reduce drying shrinkage, it is preferable to use 30-40 wt% of aluminum oxide, and it is preferable to use 5-10 parts by weight. If it is less than the range, the rough strength, chemical resistance and fire resistance are insufficient, and if it exceeds the above range, there is a problem in that the rapid hardness is excessive.

In addition, since the mixing ratio for each particle size of the coarse aggregate and the recycled fine aggregate has the greatest influence on the determination of the minimum void ratio, the coarse aggregate and the fine aggregate are separated into two particle sizes, respectively, and the porosity test according to the combination ratio (KS F 2506 of aggregate for concrete The coarse aggregate and fine aggregate combination ratio was determined by reflecting the results of the gap test method). In the present invention, 30-50 parts by weight of 6mm-15mm size coarse aggregate and 15-25 parts by weight of recycled fine aggregate of 1mm-5mm size are used. most preferred.

In addition, the blast furnace slag powder is produced as a by-product when producing pig iron in a blast furnace, and is a powdered product of slow cooling slag that cools high-temperature molten slag in the atmosphere and water chain slag that is rapidly cooled with pressure water, and is an admixture of concrete and mortar. The scope of application and quality standards for ground granulated blast-furnace slag for use in concrete used as a concrete are specified in KS F 2563.

The average chemical composition of the blast furnace slag powder is SiO ₂ = 33%, Al ₂ O ₃ = 14%, CaO = 42%, MgO = 6%, TiO ₂ = 1%, Fe ₂ O ₃ = about 0.5%, Compared to ordinary Portland cement, CaO is less, and SiO ₂ and Al ₂ O ₃ each have about 10% more features.

In particular, the blast furnace slag powder reacts with unstable calcium hydroxide generated in the cement hydration reaction, forms a stable hydrate, and makes the hardened body dense, and moreover, compared with cement, the fixing ability of chlorine ions or alkali ions (controllability of active deterioration causes) ) is large. Therefore, if blast furnace slag powder is used as a concrete admixture material, sustainable concrete can be manufactured, such as watertightness, chemical resistance, seawater resistance, salt shielding property, and durability such as alkali silica reaction control.

In addition, since the reaction to form the stable hydrate is accelerated especially at high temperature, the initial compressive strength is high in steam curing, which is advantageous for the manufacture of precast concrete, and it is possible to obtain a beautiful concrete surface with less foaming on the concrete surface.

It is preferable that the fineness of the blast furnace slag powder is 5000 to 7000 cm ² /g. If the fineness of the blast furnace slag is less than 5000 cm ² /g, the particles are thick and the reactivity is poor. If it exceeds 7000 cm ² /g, the viscosity is The workability deteriorates because it becomes too large, and in the present invention, 5 to 10 parts by weight is used, and when the content of blast furnace slag is less than 5 parts by weight, the concrete strength is lowered, and when it exceeds 10 parts by weight, the fluidity due to rapid hardening is lowered, so that the workability is reduced it gets worse

In addition, the silica fume improves the compressive strength of the concrete composition and improves the compressive strength by densifying the structure, and it is possible to manufacture a concrete water pipe body having high strength and a tight structure that does not cause cracks, In the present invention, it is preferable to use 5 to 10 parts by weight.

The nano calcium carbonate is converted into a lime component by reacting with CO2 in the atmosphere when cracks occur in the concrete to prevent cracking, and in the present invention, it is recommended to use 3 to 5 parts by weight.

The high-performance AE water reducing agent serves to improve concrete durability and workability by dispersing the powder particles of the concrete composition. As the water-reducing agent, a high-performance water-reducing agent superior in dispersing effect than a general water-reducing agent is suitable as any one or a mixture of at least two of naphthalene-based, organic acid-based, melamine-based, and polychromic acid-based water-reducing agents in powder form. The content of the water reducing agent is preferably 0.1 to 5 parts by weight. If the content of the water reducing agent is less than 0.1 part by weight, the water reducing effect is hardly expressed, and if it exceeds 1 part by weight, separation between components having different specific gravity occurs.

In addition, optionally, the concrete mortar may be formulated by adding 5 to 10 parts by weight of MMA resin as a polymer for strength reinforcement.

The methyl methacrylate (MMA) is a hard type and flexible, and when radical polymerization at a low temperature, the ratio of the syndiotactic structure showing continuous regularity of the polymer chain structure is increased, so durability and heat resistance It has excellent physical properties such as , chemical resistance, abrasion resistance, UV safety, etc. It improves adhesion strength and toughness, has good colorability by pigments, etc., has a high coefficient of thermal expansion, but is a very stable resin, so it is used in many fields because of its excellent transparency, weather resistance, and colorability. It is preferred to use ~10 parts by weight.

On the other hand, in the present invention, for the purification of the water quality of rainwater or sewage flowing in a concrete waterway pipe, a titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of TiO ₂ is used.

In general, the photocatalytic oxidation technology using a titanium dioxide (TiO2) photocatalyst is a new advanced oxidation technology that is rapidly increasing in use in recent years. Titanium dioxide generates photoinduced electrons and holes after being excited by high-energy photons. These electrons and holes react with oxygen and hydroxyl groups in water to generate various active oxygen. The generated active oxygen has a strong oxidizing ability and can decompose organic pollutants accordingly.

However, because titanium dioxide has a large band-gap energy (3.2eV), it can be activated only by a light source in the ultraviolet (UV) region, and its use in the visible region is limited.

In addition, the electrons and holes generated by the light source tend to recombine in the photocatalytic oxidation process, thereby reducing the overall oxidation efficiency. In order to overcome this disadvantage, recently, by reducing the band-gap energy after structurally doping a metal by reacting with titanium dioxide, the recombination rate of electrons and holes is reduced, and at the same time, it is high in the visible light region, which has lower energy than ultraviolet light. A lot of research is in progress to have photocatalytic properties.

In previous studies, various metals including cobalt (Co), barium (Ba), manganese (Mn), nickel (Ni), copper (Cu), zinc (Zn), and iron (Fe) were used to dope titanium dioxide. Afterwards, the improved photocatalytic performance was studied, and as a result, these materials improved the photocatalytic performance of titanium dioxide under visible light irradiation by shifting the absorption spectrum to a lower energy region. After reducing the -gap energy, the photocatalytic oxidation reaction efficiency in the visible light region was increased, but the performance was not satisfactory.

Therefore, in the present invention, a titanium dioxide surface-modified photocatalyst doped with Ni and Cu _{on the surface of TiO 2 is} used. A titanium dioxide powder and a nickel powder and copper powder having a particle size of 0.2 to 2 μm as shown in FIG. 2 are mixed, but the titanium dioxide powder: nickel powder: copper powder is mixed in a 10:1:1 weight ratio and 1,300 It is possible to use a powdered product having a particle size of 3 to 5 μm by heating and calcining at ℃.

In addition, optionally, the titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of the TiO ₂ , as a precursor of titanium dioxide, ethanol (C with respect to 1 volume of titanium tetraisopropoxide (TTIP) solution) After mixing ₂ H ₅ OH) 10 volume and acetic acid (CH ₃ COOH) (99.8 %) 2 volume, as a copper precursor, copper nitrate (Cu(NO ₃ ) 6H ₂ O) (0.5 M) aqueous solution 5 volume and As a nickel precursor, 5 volumes of an aqueous solution of nickel nitrate (Ni(NO ₃ )·6H ₂ O) (0.5 M) were added, homogeneously stirred and sonicated at room temperature, evaporated to dryness, and calcined in a nitrogen furnace at 500 ° C. for 5 hours to powder. You can use what has been refined.

In particular, as one of the characteristic configurations of the present invention, the composite material including the titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of the TiO ₂ is a titanium dioxide surface modification photocatalyst prepared above: cement: water 1:0.5 A mixture of :0.5 to 1 by weight is used by coating the fine recycled aggregate.

In the method of coating the composite material on the recycled aggregate, the composite material is coated by mixing, coating, curing and curing the composite material while spraying the composite material on the surface of the recycled fine aggregate classified into silica sand No. 1 to silica sand No. 5 size with an average particle size of 1 to 5 mm. It is possible to manufacture recycled fine aggregate.

In addition, as another characteristic configuration of the present invention, the concrete water pipe body 20, the inner side 12 and/or the lower surface 13, and the coating surface hardened by spraying on the upper surface of the grating 10 of the concrete water pipe Silver is a mixture of fine recycled aggregate coated with the composite material: cement: water in a weight ratio of 1:0.5 to 1:2 to 5, which is sprayed and hardened.

In addition, optionally, it is preferable that an outlet 15 that is opened and closed by a plug member detachable from the inside is formed on the inner lower side wall of the concrete water pipe body so that water can be drained and flowed into the ground.

On the other hand, the precast concrete waterway pipe using the composite material containing the titanium dioxide surface modification photocatalyst of the present invention is classified into the size of silica sand No. 1 to silica sand No. 5 with an average particle size of 1 to 5 mm by crushing waste concrete, which is a construction waste. preparing a recycled fine aggregate; Preparing a composite material in which a titanium dioxide surface-modifying photocatalyst:cement:water is mixed in a weight ratio of 1:0.5:0.5 to 1 in which the surface of TiO ₂ is doped with Ni and Cu; mixing and coating the composite material while spraying the surface of the recycled fine aggregate to produce a recycled fine aggregate coated with the composite material; Ordinary Portland cement 20-30 parts by weight, alumina cement 5-10 parts by weight, 6mm-15mm coarse aggregate 30-50 parts by weight, 1-5mm fine aggregate 15-25 parts by weight, blast furnace slag powder 5-10 parts by weight, A concrete mortar composed of 5 to 10 parts by weight of silica fume, 3 to 5 parts by weight of nano calcium carbonate, 0.1 to 1 parts by weight of a high-performance AE water reducer, and water to be connected adjacently with a U-shaped cross section and a certain thickness and length. Constructed and seated on the grating seating end, and a concrete water pipe body including a grating seating end having a step in the longitudinal direction and a predetermined depth in the downward direction from both upper ends in order to seat and fix the grating on the upper part, the grating seating end depth and a concrete grating formed with a thickness and length corresponding to the length, the upper surface of which forms a gentle V-shape in a cross-sectional shape, and a plurality of circular or long hole-shaped water holes. curing and demolding; The composite material-coated circulating fine aggregate:cement:water 1:0.5-1:2-5 weight ratio is mixed with a slurry on the inner side and/or lower surface of the demolded concrete water pipe body and on the upper surface of the concrete grating. It may be prepared by a manufacturing method comprising a; curing after coating by spraying.

[TiO] ₂ Titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of

After mixing 1000 ml ethanol, 100 ml TTIP, and 200 ml acetic acid (99.8%), 500 ml of an aqueous solution of copper nitrate (Cu(NO ₃ ) 6H ₂ O) (0.5 M) as a copper precursor and nitric acid as a nickel precursor 500 ml of an aqueous nickel (Ni(NO ₃ )·6H ₂ O) (0.5 M) aqueous solution was added and stirred at room temperature for 30 minutes. After sonicating the finished homogeneous solution for 30 minutes, it was evaporated to dryness at 80 ° C. for 8 hours, and then calcined in a nitrogen furnace at 500 ° C. for 5 hours to finally produce Cu-Ni-TiO ₂ [Fig. 3] and prepared together.

The above description is merely illustrative of the technical idea of the present invention, and a person skilled in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments and/or drawings disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to illustrate, and the scope of the technical spirit of the present invention is not limited by these embodiments and/or drawings. . The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

10: grating 11: both sides top
12: the inner side of the conduit body 13: the inner lower surface of the conduit body
14: grating seating end 15: outlet
16: water hole 20: concrete water pipe body

Claims (9)

Concrete water pipe including a grating seating end having a U-shaped cross-section and a certain thickness and length and configured to be connected adjacently, and having a step in the inner bottom direction from both upper ends to a certain depth and longitudinal direction from both upper ends in order to seat and fix the grating on the upper part body and; It is seated on the grating seating end, it is formed with a thickness and length corresponding to the depth and length of the grating seating end, and the upper surface forms a gentle V-shape in its width cross-section, and a plurality of circular or long hole-shaped water holes are provided. Formed concrete grating: In the precast concrete water pipe comprising: the concrete water pipe body and the concrete grating are 20 to 30 parts by weight of ordinary Portland cement, 5 to 10 parts by weight of alumina cement, and 30 to 50 weight of coarse aggregate of 6 mm to 15 mm size. Part, 15-25 parts by weight of recycled fine aggregate of 1-5 mm size, 5-10 parts by weight of blast furnace slag powder, 5-10 parts by weight of silica fume, 3-5 parts by weight of nano calcium carbonate, 0.1-1 part by weight of high-performance AE water reducer and water _Doedoe wet curing molding with a concrete mortar composed of A hardened coating surface is formed by spraying a slurry containing circulating fine aggregate, cement and water coated with a composite material containing a titanium surface modification photocatalyst, and the concrete grating is wet-cured and molded, and then the slurry is applied to the upper surface. An organic compound containing nitrogen salts, mold, bacteria and VOCs contained in sewage or rainwater flowing into the interior of the concrete waterway pipe by spraying to form a hardened coating surface flows through the upper surface of the grating of the concrete waterway pipe and passes through the water hole Precast concrete water pipe using a composite material containing a titanium dioxide surface modification photocatalyst, characterized in that it is primarily removed while flowing through the inner surface of the concrete water pipe and can be removed to purify the water quality
delete According to claim 1,
Precast concrete water pipe using a composite material containing a titanium dioxide surface modification photocatalyst, characterized in that it is composed by adding 5 to 10 parts by weight of MMA resin as a polymer for strength reinforcement to the concrete mortar
According to claim 1,
The titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of TiO ₂ is a mixture of titanium dioxide powder having a particle size of 3 to 5 μm and nickel powder and copper powder having a particle size of 0.2 to 2 μm, but the titanium dioxide powder: Nickel powder: Precast concrete using a composite material containing a titanium dioxide surface modification photocatalyst, characterized in that copper powder is mixed in a weight ratio of 10:1:1 and heat-fired at 1,300°C to be powdered to a particle size of 3 to 5㎛ water pipe
According to claim 1,
The titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of TiO ₂ is ethanol (C ₂ H ₅ OH) 10 volume and acetic acid (CH ₃ ) with respect to 1 volume of titanium tetraisopropoxide (TTIP) solution. After mixing 2 volumes of COOH) (99.8 %), copper nitrate (Cu(NO ₃ )·6H ₂ O) (0.5 M) aqueous solution 5 volumes and nickel nitrate (Ni(NO ₃ )·6H ₂ O) (0.5 M ) Precast using a composite material containing a titanium dioxide surface modification photocatalyst, characterized by adding 5 volumes of aqueous solution, evaporating to dryness by homogeneous stirring and ultrasonic treatment at room temperature, and calcining for 5 hours in a nitrogen furnace at 500 ° C. concrete water pipe
According to claim 1,
The composite material comprising a titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of TiO ₂ is titanium dioxide, characterized in that the titanium dioxide surface modification photocatalyst:cement:water is mixed in a weight ratio of 1:0.5:0.5 to 1 Precast Concrete Waterway Pipe Using Composite Material Containing Surface Modification Photocatalyst
According to claim 1,
The slurry is a recycled fine aggregate coated with a composite material containing a titanium dioxide surface modification photocatalyst doped with Ni and Cu on the surface of the TiO ₂ : cement : water in a weight ratio of 1:0.5 to 1:2 to 5 Precast concrete waterway pipe using composite material containing titanium dioxide surface modification photocatalyst
According to claim 1,
Precast using a composite material containing a titanium dioxide surface modification photocatalyst, characterized in that an outlet that is opened and closed with a detachable stopper from the inside is formed on one side wall of the lower inner side of the concrete water pipe so that water can be drained and flowed into the ground concrete water pipe
Preparing recycled fine aggregates classified into silica sand No. 1 to silica sand No. 5 size with an average particle size of 1 to 5 mm by crushing waste concrete as a construction waste; Preparing a composite material in which a titanium dioxide surface-modifying photocatalyst:cement:water is mixed in a weight ratio of 1:0.5:0.5 to 1 in which the surface of TiO ₂ is doped with Ni and Cu; mixing and coating the composite material while spraying the surface of the recycled fine aggregate to produce a recycled fine aggregate coated with the composite material; Ordinary Portland cement 20-30 parts by weight, alumina cement 5-10 parts by weight, 6mm-15mm coarse aggregate 30-50 parts by weight, 1-5mm fine aggregate 15-25 parts by weight, blast furnace slag powder 5-10 parts by weight, A concrete mortar composed of 5 to 10 parts by weight of silica fume, 3 to 5 parts by weight of nano calcium carbonate, 0.1 to 1 parts by weight of a high-performance AE water reducer, and water to be connected adjacently with a U-shaped cross section and a certain thickness and length. Constructed and seated on the grating seating end, and a concrete water pipe body including a grating seating end having a step in the longitudinal direction and a predetermined depth in the downward direction from both upper ends in order to seat and fix the grating on the upper part, the grating seating end depth and a concrete grating formed with a thickness and length corresponding to the length, the upper surface of which forms a gentle V-shape in a cross-sectional shape, and a plurality of circular or long hole-shaped water holes. curing and demolding; The composite material-coated circulating fine aggregate:cement:water 1:0.5-1:2-5 weight ratio is mixed with a slurry on the inner side and/or lower surface of the demolded concrete water pipe body and on the upper surface of the concrete grating. A method for manufacturing a precast concrete water pipe using a composite material comprising a titanium dioxide surface modification photocatalyst according to any one of claims 1 to 8, comprising: spraying, coating, and then curing;

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