CN111268964A - Reinforced concrete pipe and manufacturing process thereof - Google Patents
Reinforced concrete pipe and manufacturing process thereof Download PDFInfo
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- CN111268964A CN111268964A CN201911332848.3A CN201911332848A CN111268964A CN 111268964 A CN111268964 A CN 111268964A CN 201911332848 A CN201911332848 A CN 201911332848A CN 111268964 A CN111268964 A CN 111268964A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
- B28B21/60—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/329—Polymers modified by chemical after-treatment with organic compounds
- C08G65/331—Polymers modified by chemical after-treatment with organic compounds containing oxygen
- C08G65/332—Polymers modified by chemical after-treatment with organic compounds containing oxygen containing carboxyl groups, or halides, or esters thereof
- C08G65/3322—Polymers modified by chemical after-treatment with organic compounds containing oxygen containing carboxyl groups, or halides, or esters thereof acyclic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/329—Polymers modified by chemical after-treatment with organic compounds
- C08G65/331—Polymers modified by chemical after-treatment with organic compounds containing oxygen
- C08G65/332—Polymers modified by chemical after-treatment with organic compounds containing oxygen containing carboxyl groups, or halides, or esters thereof
- C08G65/3324—Polymers modified by chemical after-treatment with organic compounds containing oxygen containing carboxyl groups, or halides, or esters thereof cyclic
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Structural Engineering (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of concrete pipe preparation, in particular to a reinforced concrete pipe and a manufacturing process thereof; the composition is prepared from the following raw materials: portland cement, mineral powder, volcanic slag, fly ash ceramsite, asbestos fiber, metakaolin, a water reducing agent, fine river sand, broken stone, a retarder, a water-retaining agent, calcium formate, an early strength agent and water; compared with the traditional reinforced concrete pipe, the reinforced concrete pipe manufactured by the invention has better bearing capacity and better quality; in addition, calcium formate and early strength agent are used as raw materials for preparing the reinforced concrete pipe, wherein the early strength agent and the calcium formate are mutually cooperated, so that the service life of the reinforced concrete pipe can be obviously prolonged; in addition, the expansion coefficient of the reinforced concrete pipe can be reduced to a certain extent by the matching use of the asbestos fiber, the mineral powder and the water-retaining agent, the occurrence of surface cracking of the reinforced concrete pipe is reduced, and the quality of the reinforced concrete pipe is ensured.
Description
Technical Field
The invention relates to the technical field of reinforced concrete pipe preparation, in particular to a reinforced concrete pipe and a manufacturing process thereof.
Background
The reinforced concrete pipe is a preset pipeline which is made of cement and reinforced steel bars and is manufactured by applying the principle of telegraph pole centrifugal force. The reinforced concrete pipe can be used as a sewer pipeline in urban construction foundations, can discharge sewage and flood control drainage, and can be used as a water supply pipe and a farmland motor-pumped well in special factories and mines. The method generally comprises the following steps: plain end reinforced concrete pipe, flexible tongue-and-groove reinforced concrete pipe, socket reinforced concrete pipe, F-shaped steel socket reinforced concrete pipe, plain end lantern ring interface reinforced concrete pipe, tongue-and-groove reinforced concrete pipe, etc.
Although the reinforced concrete pipe manufactured by the prior art can basically meet the requirements of the engineering field, the anti-cracking performance of the reinforced concrete pipe is poor, and the bearing capacity is relatively low. Under the circumstances, it is an urgent need to solve the technical problems of the prior art to provide a new reinforced concrete pipe and a manufacturing process thereof.
Disclosure of Invention
The first purpose of the invention is to provide a reinforced concrete pipe, which has the advantages that: the bearing capacity is strong, the anti-cracking performance is good, and the expansion coefficient is small; can reduce the expansion coefficient of the reinforced concrete pipe to a certain extent, reduce the occurrence of surface cracking phenomenon and ensure the quality of the reinforced concrete pipe.
In order to achieve the purpose, the invention provides the following technical scheme:
a reinforced concrete pipe is composed of the following raw materials in parts by weight: 700 parts of Portland cement, 200 parts of 150 parts of mineral powder, 150 parts of volcanic slag, 70-100 parts of fly ash ceramsite, 250 parts of asbestos fiber, 50-70 parts of metakaolin, 15-40 parts of water reducing agent, 180 parts of fine river sand, 70-100 parts of gravel, 6-30 parts of retarder, 8-30 parts of water retaining agent, 4-25 parts of calcium formate, 5-20 parts of early strength admixture and 500 parts of water 350.
By adopting the technical scheme, the novel water reducing agent is prepared by taking succinic anhydride, citric acid and terminal alkenyl polyoxyethylene ether as raw materials, so that cement particles are uniformly dispersed in a concrete system, and the uniformity of the quality of the manufactured reinforced concrete pipe is ensured. In the process of pouring the reinforced concrete pipe, a proper amount of strong alkaline solution is added into the raw materials, so that a compact and difficult-to-accommodate protective layer is formed on the surface of cement, water molecules are prevented from entering, and the normal hydration of the cement is also hindered, so that the concrete has good dispersion and slump retaining capacity, and the cement adaptability is strong. Therefore, also make the reinforced concrete pipe of pouring have better bearing capacity compared with traditional reinforced concrete pipe, its quality is also better.
The invention is further configured to: the mineral powder is prepared by mixing spodumene powder and cordierite powder according to the weight ratio of 3-5: 1-3.
By adopting the technical scheme, the mixture of the spodumene powder and the cordierite is used as the raw material for preparing the reinforced concrete pipe, and the spodumene powder and the cordierite are mutually cooperated to reduce the expansion coefficient of the reinforced concrete pipe to a certain extent, reduce the surface cracking phenomenon and ensure the quality of the reinforced concrete pipe.
The invention is further configured to: the retarder is zinc salt or phosphate.
By adopting the technical scheme, the retarder prolongs the hydration hardening time of the pouring slurry, so that the pouring slurry can keep plasticity for a long time, and the setting time of the pouring slurry is adjusted.
The invention is further configured to: the water-retaining agent is polyacrylamide or hydroxyethyl methyl enhanced cellulose ether.
By adopting the technical scheme, the water-retaining agent, the asbestos fiber and the mineral powder are matched to reduce the expansion coefficient of the reinforced concrete pipe to a certain extent, reduce the surface cracking phenomenon and ensure the quality of the reinforced concrete pipe.
The invention is further configured to: the early strength agent is triethanolamine or urea.
By adopting the technical scheme, the early strength agent can accelerate the hydration speed of the pouring slurry, thereby shortening the time required for preparing the reinforced concrete pipe and improving the efficiency for preparing the reinforced concrete pipe.
The invention is further configured to: the manufacturing process of the water reducing agent comprises the following steps:
a. m (succinic anhydride) by weight: m (concentrated hydrochloric acid): m (formaldehyde): m (citric acid): m (terminal alkenyl polyoxyethylene ether) ═ 95-105: 110-120: 45-55: 20-30: 35-40 accurately weighing succinic anhydride, concentrated hydrochloric acid, formaldehyde, citric acid and terminal alkenyl polyoxyethylene ether, then putting sodium succinate and citric acid into a reaction kettle, slowly adding the concentrated hydrochloric acid into the reaction kettle, controlling the temperature in the reaction kettle at 130-140 ℃ after the concentrated hydrochloric acid is added, and reacting for 3-5 hours at the temperature, wherein the mixture in the reaction kettle is marked as a mixed component;
b. after the reaction is finished, reducing the temperature in the reaction kettle to 110 ℃ under natural conditions, then slowly dropwise adding the weighed formaldehyde into the mixed components in the reaction kettle, adding the terminal alkenyl polyoxyethylene ether into the reaction kettle after the dropwise adding of the formaldehyde is finished, mechanically stirring for 5-10min, and then carrying out heat preservation reaction for 5-8h under the condition of 110 ℃ under 100 ℃ and;
c. adding sodium hydroxide solution into the reaction kettle after the reaction is finished, and stirring at the speed of 120-; and then adjusting the pH of the mixed components in the reaction kettle to be neutral, and discharging to obtain the water reducer.
By adopting the technical scheme, the calcium formate and the early strength agent are used as raw materials for preparing the reinforced concrete pipe, wherein the early strength agent and the calcium formate are mutually cooperated, so that the development rate of the early strength and the early strength of the reinforced concrete pipe during pouring can be greatly improved, and the later strength development of concrete can be benefited. In addition, the early strength concrete pipe and the water reducing agent are matched with each other, so that a good early strength effect can be achieved, the problem that reinforcing steel bars in concrete are corroded due to certain early strength components can be avoided, and the service life of the reinforced concrete pipe is remarkably prolonged.
The invention is further configured to: the speed of the mechanical stirring in the step b is 240-420 r/min.
By adopting the technical scheme, the mixture in the reaction kettle is mechanically stirred at the stirring speed, so that the collision probability among the succinic anhydride, the citric acid and the terminal alkenyl polyoxyethylene ether can be increased, the preparation efficiency of the water reducing agent is ensured, and the preparation time of the water reducing agent is shortened.
The invention is further configured to: the concentration of the sodium hydroxide solution used for adjusting the pH in the step c is 0.8-1.2 mol/L.
Through adopting above-mentioned technical scheme, the use of sodium hydroxide solution is used for neutralizing the unnecessary concentrated hydrochloric acid in the reation kettle, reduces the influence of concentrated hydrochloric acid to the water-reducing agent quality of preparing, guarantees the quality of water-reducing agent.
The second purpose of the invention is to provide a manufacturing process of a reinforced concrete pipe, which comprises the following steps:
s1, straightening phi 6 round steel by using a 1T winch in the steel bar storage and processing area, and processing the round steel into a hooked bar, wherein the phi 8 cold-drawn ribbed steel bar is fixed-length and does not need to be processed;
s2, conveying the processed semi-finished product of the steel bar to a steel bar manufacturing area, manufacturing and welding the steel bar, and manufacturing and processing the annular steel bar by using a seam welder during welding;
s3, after the reinforcement cage is machined, conveying the reinforcement cage to a concrete pipeline manufacturing position, polishing, assembling an outer die, installing a mortar gasket, ensuring that the thickness of a protective layer of the reinforcement meets the specification requirement, and then hoisting the reinforcement cage on a suspension rolling machine by using a gantry crane; wherein the checking comprises checking whether the seam of the template is tight;
s4, adding a water reducing agent, mineral powder and calcium formate into water according to the weight ratio of the raw materials, performing ultrasonic dispersion for 5-10min by using an ultrasonic disperser at the frequency of 30-40kHz, then adding the rest raw materials into the water, uniformly and fully stirring the rest raw materials by using a stirrer, and pouring concrete in the obtained mixed material according to the existing process after stirring;
and S5, performing form removal treatment on the concrete pipe poured in the step S4, performing steam curing after the form removal, arranging a corresponding curing pool near a concrete manufacturing area according to actual conditions, hoisting the curing pool into the curing pool by a gantry crane, covering a plastic film on the surface of the curing pool, and performing warming and moisturizing by using a steam boiler. After the concrete is discharged from the pool, carrying out spray maintenance on the concrete, wherein the maintenance days are more than or equal to 28 days;
and S6, maintaining the concrete pipe, inspecting the quality of the concrete pipe, and transporting the concrete pipe to a concrete pipe storage area for stacking after the inspection is qualified.
By adopting the technical scheme, the process can not only greatly improve the development rate of the early strength and the early strength thereof during the pouring of the reinforced concrete pipe, but also bring benefits to the development of the later strength of concrete. In addition, the early strength concrete pipe and the water reducing agent are matched with each other, so that a good early strength effect can be achieved, the problem that reinforcing steel bars in concrete are corroded due to certain early strength components can be avoided, and the service life of the reinforced concrete pipe is remarkably prolonged. In addition, the expansion coefficient of the reinforced concrete pipe can be reduced to a certain extent by the matching use of the asbestos fiber, the mineral powder and the water-retaining agent, the occurrence of surface cracking of the reinforced concrete pipe is reduced, and the quality of the reinforced concrete pipe is ensured.
In summary, the invention has the following advantages:
1. the novel water reducing agent is prepared by taking succinic anhydride, citric acid and terminal alkenyl polyoxyethylene ether as raw materials, wherein the citric acid has more negative charges after 3 hydrogen ions are ionized, the negative charges have strong adsorbability, and succinic anhydride molecules can be rapidly adsorbed to the surfaces of cement particles with positive charges, so that the cement particles have a large amount of negative charges. The cement molecules with the same charges on the surfaces repel each other under the action of coulomb force, so that the cement particles are uniformly dispersed in a concrete system, and the uniformity of the quality of the manufactured reinforced concrete pipe is ensured. In the process of pouring the reinforced concrete pipe, a proper amount of strong alkaline solution is added into the raw materials, so that a compact and difficult-to-accommodate protective layer is formed on the surface of cement, water molecules are prevented from entering, and the normal hydration of the cement is also hindered, so that the concrete has good dispersion and slump retaining capacity, and the cement adaptability is strong. Therefore, compared with the traditional reinforced concrete pipe, the poured reinforced concrete pipe has better bearing capacity and better quality;
2. the calcium formate and the early strength agent are used as raw materials for preparing the reinforced concrete pipe, wherein the early strength agent and the calcium formate are mutually cooperated, so that the development rate of the early strength and the early strength of the reinforced concrete pipe during pouring can be greatly improved, and the benefit can be brought to the development of the later strength of concrete. In addition, the early strength concrete pipe and the water reducing agent are matched with each other, so that a good early strength effect can be achieved, the problem that reinforcing steel bars in concrete are corroded due to certain early strength components can be avoided, and the service life of the reinforced concrete pipe is remarkably prolonged. In addition, the expansion coefficient of the reinforced concrete pipe can be reduced to a certain extent by the matching use of the asbestos fiber, the mineral powder and the water-retaining agent, the occurrence of surface cracking of the reinforced concrete pipe is reduced, and the quality of the reinforced concrete pipe is ensured.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1:
a reinforced concrete pipe is composed of the following raw materials in parts by weight: 550 parts of portland cement, 150 parts of mineral powder, 120 parts of scoria, 70 parts of fly ash ceramsite, 200 parts of asbestos fiber, 50 parts of metakaolin, 25 parts of water reducing agent, 140 parts of fine river sand, 80 parts of broken stone, 6 parts of retarder, 15 parts of water-retaining agent, 4 parts of calcium formate, 10 parts of early strength agent and 350 parts of water.
The mineral powder is prepared by mixing spodumene powder and cordierite powder according to the weight ratio of 3: 1.
The retarder is zinc salt.
The water-retaining agent is polyacrylamide.
The early strength agent is triethanolamine.
The manufacturing process of the water reducing agent comprises the following steps:
a. m (succinic anhydride) by weight: m (concentrated hydrochloric acid): m (formaldehyde): m (citric acid): m (terminal alkenyl polyoxyethylene ether) ═ 95: 110: 45: 20: 35 accurately weighing succinic anhydride, concentrated hydrochloric acid, formaldehyde, citric acid and terminal alkenyl polyoxyethylene ether, then putting sodium succinate and citric acid into a reaction kettle, slowly adding the concentrated hydrochloric acid into the reaction kettle, controlling the temperature in the reaction kettle to be 130 ℃ after the concentrated hydrochloric acid is added, and reacting for 3 hours at the temperature, wherein the mixture in the reaction kettle is marked as a mixed component;
b. after the reaction is finished, reducing the temperature in the reaction kettle to 100 ℃ under natural conditions, then slowly dropwise adding the weighed formaldehyde into the mixed components in the phase reaction kettle, adding the terminal alkenyl polyoxyethylene ether into the reaction kettle after the dropwise adding of the formaldehyde is finished, mechanically stirring for 5min, and then carrying out heat preservation reaction for 5-8h at the temperature of 100 ℃;
c. adding a sodium hydroxide solution into the reaction kettle after the reaction is finished, and stirring for 3min at the speed of 120 r/min; and then adjusting the pH of the mixed components in the reaction kettle to be neutral, and discharging to obtain the water reducer.
The mechanical stirring rate in step b was 240 r/min.
The concentration of the sodium hydroxide solution used for adjusting the pH in step c was 0.8 mol/L.
A manufacturing process of a reinforced concrete pipe comprises the following steps:
s1, straightening phi 6 round steel by using a 1T winch in the steel bar storage and processing area, and processing the round steel into a hooked bar, wherein the phi 8 cold-drawn ribbed steel bar is fixed-length and does not need to be processed;
s2, conveying the processed semi-finished product of the steel bar to a steel bar manufacturing area, manufacturing and welding the steel bar, and manufacturing and processing the annular steel bar by using a seam welder during welding;
s3, after the reinforcement cage is machined, conveying the reinforcement cage to a concrete pipeline manufacturing position, polishing, assembling an outer die, installing a mortar gasket, ensuring that the thickness of a protective layer of the reinforcement meets the specification requirement, and then hoisting the reinforcement cage on a suspension rolling machine by using a gantry crane; wherein the checking comprises checking whether the seam of the template is tight;
s4, adding a water reducing agent, mineral powder and calcium formate into water according to the weight ratio of the raw materials, performing ultrasonic dispersion for 5min by using an ultrasonic disperser at the frequency of 30kHz, then adding the rest raw materials into the water, uniformly and fully stirring the raw materials by using a stirrer, and pouring concrete in the obtained mixed material according to the existing process after stirring;
and S5, performing form removal treatment on the concrete pipe poured in the step S4, performing steam curing after the form removal, arranging a corresponding curing pool near a concrete manufacturing area according to actual conditions, hoisting the curing pool into the curing pool by a gantry crane, covering a plastic film on the surface of the curing pool, and performing warming and moisturizing by using a steam boiler. After the concrete is discharged from the pool, carrying out spray maintenance on the concrete, wherein the maintenance days are 28 days;
and S6, maintaining the concrete pipe, inspecting the quality of the concrete pipe, and transporting the concrete pipe to a concrete pipe storage area for stacking after the inspection is qualified.
Example 2:
a reinforced concrete pipe is composed of the following raw materials in parts by weight: 500 parts of portland cement, 170 parts of mineral powder, 100 parts of scoria, 80 parts of fly ash ceramsite, 160 parts of asbestos fiber, 55 parts of metakaolin, 15 parts of water reducing agent, 150 parts of fine river sand, 70 parts of crushed stone, 15 parts of retarder, 8 parts of water-retaining agent, 10 parts of calcium formate, 5 parts of early strength agent and 400 parts of water.
The mineral powder is prepared by mixing spodumene powder and cordierite powder according to the weight ratio of 4: 2.
The retarder is phosphate.
The water retention agent is hydroxyethyl methyl enhanced cellulose ether.
The early strength agent is urea.
The manufacturing process of the water reducing agent comprises the following steps:
a. m (succinic anhydride) by weight: m (concentrated hydrochloric acid): m (formaldehyde): m (citric acid): m (terminal alkenyl polyoxyethylene ether) ═ 98: 115: 48: 25: 36, accurately weighing succinic anhydride, concentrated hydrochloric acid, formaldehyde, citric acid and terminal alkenyl polyoxyethylene ether, then putting sodium succinate and citric acid into a reaction kettle, slowly adding the concentrated hydrochloric acid into the reaction kettle, controlling the temperature in the reaction kettle to be 135 ℃ after the concentrated hydrochloric acid is added, and reacting for 4 hours at the temperature, wherein the mixture in the reaction kettle is marked as a mixed component;
b. after the reaction is finished, reducing the temperature in the reaction kettle to 105 ℃ under natural conditions, then slowly dropwise adding the weighed formaldehyde into the mixed components in the phase reaction kettle, adding the terminal alkenyl polyoxyethylene ether into the reaction kettle after the dropwise adding of the formaldehyde is finished, mechanically stirring for 7min, and then carrying out heat preservation reaction for 6h under the condition of 105 ℃;
c. adding a sodium hydroxide solution into the reaction kettle after the reaction is finished, and stirring at the speed of 150r/min for 4 min; and then adjusting the pH of the mixed components in the reaction kettle to be neutral, and discharging to obtain the water reducer.
The speed of mechanical stirring in step b was 300 r/min.
The concentration of the sodium hydroxide solution used for adjusting the pH in step c was 1.0 mol/L.
A manufacturing process of a reinforced concrete pipe comprises the following steps:
s1, straightening phi 6 round steel by using a 1T winch in the steel bar storage and processing area, and processing the round steel into a hooked bar, wherein the phi 8 cold-drawn ribbed steel bar is fixed-length and does not need to be processed;
s2, conveying the processed semi-finished product of the steel bar to a steel bar manufacturing area, manufacturing and welding the steel bar, and manufacturing and processing the annular steel bar by using a seam welder during welding;
s3, after the reinforcement cage is machined, conveying the reinforcement cage to a concrete pipeline manufacturing position, polishing, assembling an outer die, installing a mortar gasket, ensuring that the thickness of a protective layer of the reinforcement meets the specification requirement, and then hoisting the reinforcement cage on a suspension rolling machine by using a gantry crane; wherein the checking comprises checking whether the seam of the template is tight;
s4, adding a water reducing agent, mineral powder and calcium formate into water according to the weight ratio of the raw materials, performing ultrasonic dispersion for 7min by using an ultrasonic disperser at the frequency of 35kHz, then adding the rest raw materials into the water, uniformly and fully stirring the raw materials by using a stirrer, and pouring concrete in the obtained mixed material according to the existing process after stirring;
and S5, performing form removal treatment on the concrete pipe poured in the step S4, performing steam curing after the form removal, arranging a corresponding curing pool near a concrete manufacturing area according to actual conditions, hoisting the curing pool into the curing pool by a gantry crane, covering a plastic film on the surface of the curing pool, and performing warming and moisturizing by using a steam boiler. After the concrete is discharged from the pool, carrying out spray maintenance on the concrete, wherein the maintenance days are 30 days;
and S6, maintaining the concrete pipe, inspecting the quality of the concrete pipe, and transporting the concrete pipe to a concrete pipe storage area for stacking after the inspection is qualified.
Example 3:
a reinforced concrete pipe is composed of the following raw materials in parts by weight: 700 parts of Portland cement, 180 parts of mineral powder, 150 parts of volcanic cinders, 90 parts of fly ash ceramsite, 250 parts of asbestos fiber, 60 parts of metakaolin, 40 parts of water reducing agent, 160 parts of fine river sand, 100 parts of crushed stone, 20 parts of retarder, 30 parts of water-retaining agent, 15 parts of calcium formate, 20 parts of early strength agent and 450 parts of water.
The mineral powder is prepared by mixing spodumene powder and cordierite powder according to the weight ratio of 4: 3.
The retarder is zinc salt.
The water-retaining agent is polyacrylamide.
The early strength agent is triethanolamine.
The manufacturing process of the water reducing agent comprises the following steps:
a. m (succinic anhydride) by weight: m (concentrated hydrochloric acid): m (formaldehyde): m (citric acid): m (terminal alkenyl polyoxyethylene ether) ═ 100: 118: 50: 28: 38, accurately weighing succinic anhydride, concentrated hydrochloric acid, formaldehyde, citric acid and terminal alkenyl polyoxyethylene ether, then putting sodium succinate and citric acid into a reaction kettle, slowly adding the concentrated hydrochloric acid into the reaction kettle, controlling the temperature in the reaction kettle to be 138 ℃ after the concentrated hydrochloric acid is added, and reacting for 4 hours at the temperature, wherein the mixture in the reaction kettle is marked as a mixed component;
b. after the reaction is finished, reducing the temperature in the reaction kettle to 108 ℃ under natural conditions, then slowly dropwise adding the weighed formaldehyde into the mixed components in the phase reaction kettle, adding the terminal alkenyl polyoxyethylene ether into the reaction kettle after the dropwise adding of the formaldehyde is finished, mechanically stirring for 8min, and then carrying out heat preservation reaction for 7h at 108 ℃;
c. adding a sodium hydroxide solution into the reaction kettle after the reaction is finished, and stirring at the speed of 180r/min for 4 min; and then adjusting the pH of the mixed components in the reaction kettle to be neutral, and discharging to obtain the water reducer.
The speed of mechanical stirring in step b was 360 r/min.
The concentration of the sodium hydroxide solution used for adjusting the pH in step c was 1.1 mol/L.
A manufacturing process of a reinforced concrete pipe comprises the following steps:
s1, straightening phi 6 round steel by using a 1T winch in the steel bar storage and processing area, and processing the round steel into a hooked bar, wherein the phi 8 cold-drawn ribbed steel bar is fixed-length and does not need to be processed;
s2, conveying the processed semi-finished product of the steel bar to a steel bar manufacturing area, manufacturing and welding the steel bar, and manufacturing and processing the annular steel bar by using a seam welder during welding;
s3, after the reinforcement cage is machined, conveying the reinforcement cage to a concrete pipeline manufacturing position, polishing, assembling an outer die, installing a mortar gasket, ensuring that the thickness of a protective layer of the reinforcement meets the specification requirement, and then hoisting the reinforcement cage on a suspension rolling machine by using a gantry crane; wherein the checking comprises checking whether the seam of the template is tight;
s4, adding a water reducing agent, mineral powder and calcium formate into water according to the weight ratio of the raw materials, performing ultrasonic dispersion for 8min by using an ultrasonic disperser at the frequency of 38kHz, then adding the rest raw materials into the water, uniformly and fully stirring the raw materials by using a stirrer, and pouring concrete in the obtained mixed material according to the existing process after stirring;
and S5, performing form removal treatment on the concrete pipe poured in the step S4, performing steam curing after the form removal, arranging a corresponding curing pool near a concrete manufacturing area according to actual conditions, hoisting the curing pool into the curing pool by a gantry crane, covering a plastic film on the surface of the curing pool, and performing warming and moisturizing by using a steam boiler. After the concrete is discharged from the pool, carrying out spray maintenance on the concrete, wherein the maintenance days are 32 days;
and S6, maintaining the concrete pipe, inspecting the quality of the concrete pipe, and transporting the concrete pipe to a concrete pipe storage area for stacking after the inspection is qualified.
Example 4:
a reinforced concrete pipe is composed of the following raw materials in parts by weight: 600 parts of portland cement, 200 parts of mineral powder, 140 parts of scoria, 100 parts of fly ash ceramsite, 230 parts of asbestos fiber, 70 parts of metakaolin, 30 parts of water reducing agent, 180 parts of fine river sand, 90 parts of broken stone, 30 parts of retarder, 20 parts of water-retaining agent, 25 parts of calcium formate, 15 parts of early strength agent and 500 parts of water.
The mineral powder is prepared by mixing spodumene powder and cordierite powder according to the weight ratio of 5: 3.
The retarder is phosphate.
The water retention agent is hydroxyethyl methyl enhanced cellulose ether.
The early strength agent is urea.
The manufacturing process of the water reducing agent comprises the following steps:
a. m (succinic anhydride) by weight: m (concentrated hydrochloric acid): m (formaldehyde): m (citric acid): m (terminal alkenyl polyoxyethylene ether) ═ 105: 120: 55: 30: 40, accurately weighing succinic anhydride, concentrated hydrochloric acid, formaldehyde, citric acid and terminal alkenyl polyoxyethylene ether, then putting sodium succinate and citric acid into a reaction kettle, slowly adding the concentrated hydrochloric acid into the reaction kettle, controlling the temperature in the reaction kettle to be 140 ℃ after the concentrated hydrochloric acid is added, and reacting for 5 hours at the temperature, wherein the mixture in the reaction kettle is marked as a mixed component;
b. after the reaction is finished, reducing the temperature in the reaction kettle to 110 ℃ under natural conditions, then slowly dropwise adding the weighed formaldehyde into the mixed components in the phase reaction kettle, adding the terminal alkenyl polyoxyethylene ether into the reaction kettle after the dropwise adding of the formaldehyde is finished, mechanically stirring for 10min, and then carrying out heat preservation reaction for 8h at the temperature of 110 ℃;
c. adding a sodium hydroxide solution into the reaction kettle after the reaction is finished, and stirring at the speed of 200r/min for 5 min; and then adjusting the pH of the mixed components in the reaction kettle to be neutral, and discharging to obtain the water reducer.
The mechanical stirring rate in step b was 420 r/min.
The concentration of the sodium hydroxide solution used for adjusting the pH in step c was 1.2 mol/L.
A manufacturing process of a reinforced concrete pipe comprises the following steps:
s1, straightening phi 6 round steel by using a 1T winch in the steel bar storage and processing area, and processing the round steel into a hooked bar, wherein the phi 8 cold-drawn ribbed steel bar is fixed-length and does not need to be processed;
s2, conveying the processed semi-finished product of the steel bar to a steel bar manufacturing area, manufacturing and welding the steel bar, and manufacturing and processing the annular steel bar by using a seam welder during welding;
s3, after the reinforcement cage is machined, conveying the reinforcement cage to a concrete pipeline manufacturing position, polishing, assembling an outer die, installing a mortar gasket, ensuring that the thickness of a protective layer of the reinforcement meets the specification requirement, and then hoisting the reinforcement cage on a suspension rolling machine by using a gantry crane; wherein the checking comprises checking whether the seam of the template is tight;
s4, adding a water reducing agent, mineral powder and calcium formate into water according to the weight ratio of the raw materials, performing ultrasonic dispersion for 5-10min by using an ultrasonic disperser at the frequency of 40kHz, adding the rest raw materials into the water, uniformly and fully stirring the raw materials by using a stirrer, and pouring concrete in the obtained mixed material according to the existing process after stirring;
and S5, performing form removal treatment on the concrete pipe poured in the step S4, performing steam curing after the form removal, arranging a corresponding curing pool near a concrete manufacturing area according to actual conditions, hoisting the curing pool into the curing pool by a gantry crane, covering a plastic film on the surface of the curing pool, and performing warming and moisturizing by using a steam boiler. After the concrete is discharged from the pool, carrying out spray maintenance on the concrete, wherein the maintenance days are 35 days;
and S6, maintaining the concrete pipe, inspecting the quality of the concrete pipe, and transporting the concrete pipe to a concrete pipe storage area for stacking after the inspection is qualified.
And (3) performance detection:
the performance of the reinforced-concrete pipes manufactured by the prior art (comparative example) and the reinforced-concrete pipes manufactured by examples 1, 2, 3 and 4 of the present invention was measured, and the obtained data are recorded in the following table:
from the data in the above table, it can be seen that the reinforced concrete pipe manufactured by the present invention is superior to the comparative example in both the load bearing capacity and the crack resistance. The reinforced concrete pipe manufactured by the invention has better quality and is more suitable for popularization.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.
Claims (9)
1. A reinforced concrete pipe is characterized by comprising the following raw materials in parts by weight: 700 parts of Portland cement, 200 parts of 150 parts of mineral powder, 150 parts of volcanic slag, 70-100 parts of fly ash ceramsite, 250 parts of asbestos fiber, 50-70 parts of metakaolin, 15-40 parts of water reducing agent, 180 parts of fine river sand, 70-100 parts of gravel, 6-30 parts of retarder, 8-30 parts of water retaining agent, 4-25 parts of calcium formate, 5-20 parts of early strength admixture and 500 parts of water 350.
2. A reinforced concrete pipe according to claim 1, wherein: the mineral powder is prepared by mixing spodumene powder and cordierite powder according to the weight ratio of 3-5: 1-3.
3. A reinforced concrete pipe according to claim 1, wherein: the retarder is zinc salt or phosphate.
4. A reinforced concrete pipe according to claim 1, wherein: the water-retaining agent is polyacrylamide or hydroxyethyl methyl enhanced cellulose ether.
5. A reinforced concrete pipe according to claim 1, wherein: the early strength agent is triethanolamine or urea.
6. The reinforced concrete pipe of claim 1, wherein the water reducing agent manufacturing process comprises the following steps:
a. m (succinic anhydride) by weight: m (concentrated hydrochloric acid): m (formaldehyde): m (citric acid): m (terminal alkenyl polyoxyethylene ether) = 95-105: 110-120: 45-55: 20-30: 35-40 accurately weighing succinic anhydride, concentrated hydrochloric acid, formaldehyde, citric acid and terminal alkenyl polyoxyethylene ether, then putting sodium succinate and citric acid into a reaction kettle, slowly adding the concentrated hydrochloric acid into the reaction kettle, controlling the temperature in the reaction kettle at 130-140 ℃ after the concentrated hydrochloric acid is added, and reacting for 3-5 hours at the temperature, wherein the mixture in the reaction kettle is marked as a mixed component;
b. after the reaction is finished, reducing the temperature in the reaction kettle to 110 ℃ under natural conditions, then slowly dropwise adding the weighed formaldehyde into the mixed components in the reaction kettle, adding the terminal alkenyl polyoxyethylene ether into the reaction kettle after the dropwise adding of the formaldehyde is finished, mechanically stirring for 5-10min, and then carrying out heat preservation reaction for 5-8h under the condition of 110 ℃ under 100 ℃ and;
c. adding sodium hydroxide solution into the reaction kettle after the reaction is finished, and stirring at the speed of 120-; and then adjusting the pH of the mixed components in the reaction kettle to be neutral, and discharging to obtain the water reducer.
7. A reinforced concrete pipe according to claim 6, wherein: the speed of the mechanical stirring in the step b is 240-420 r/min.
8. A reinforced concrete pipe according to claim 6, wherein: the concentration of the sodium hydroxide solution used for adjusting the pH in the step c is 0.8-1.2 mol/L.
9. A process for manufacturing reinforced concrete pipes according to claim 1, comprising the steps of:
s1, straightening phi 6 round steel by using a 1T winch in the steel bar storage and processing area, and processing the round steel into a hooked bar, wherein the phi 8 cold-drawn ribbed steel bar is fixed-length and does not need to be processed;
s2, conveying the processed semi-finished product of the steel bar to a steel bar manufacturing area, manufacturing and welding the steel bar, and manufacturing and processing the annular steel bar by using a seam welder during welding;
s3, after the reinforcement cage is machined, conveying the reinforcement cage to a concrete pipeline manufacturing position, polishing, assembling an outer die, installing a mortar gasket, ensuring that the thickness of a protective layer of the reinforcement meets the specification requirement, and then hoisting the reinforcement cage on a suspension rolling machine by using a gantry crane; wherein the checking comprises checking whether the seam of the template is tight;
s4, adding a water reducing agent, mineral powder and calcium formate into water according to the weight ratio of the raw materials, performing ultrasonic dispersion for 5-10min by using an ultrasonic disperser at the frequency of 30-40kHz, then adding the rest raw materials into the water, uniformly and fully stirring the rest raw materials by using a stirrer, and pouring concrete in the obtained mixed material according to the existing process after stirring;
s5, performing form removal treatment on the concrete pipe poured in the step S4, performing steam curing after the form removal, arranging a corresponding curing pool near a concrete pipe manufacturing area according to actual conditions, hoisting the curing pool into the curing pool by a gantry crane, covering a plastic film on the surface of the curing pool, heating and moisturizing by using a steam boiler, and performing spray curing on the concrete pipe after the concrete pipe is discharged from the pool, wherein the curing days are more than or equal to 28 days;
and S6, maintaining the concrete pipe, inspecting the quality of the concrete pipe, and transporting the concrete pipe to a concrete pipe storage area for stacking after the inspection is qualified.
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