CN111732367A - Prestressed duct grouting agent and preparation method thereof - Google Patents
Prestressed duct grouting agent and preparation method thereof Download PDFInfo
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/46—Rock wool ; Ceramic or silicate fibres
- C04B14/4687—Non-oxide ceramics
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/12—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polysiloxanes
- C08F283/124—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polysiloxanes on to polysiloxanes having carbon-to-carbon double bonds
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to a prestressed duct grouting agent and a preparation method thereof, wherein the grouting agent comprises the following components in parts by weight: 40-60 parts of fly ash, 8-15 parts of organic silicon modified polycarboxylic acid type water reducing agent, 2-5 parts of reinforcing fiber, 10-20 parts of expanding agent, 3-10 parts of early strength agent, 1-3 parts of defoaming agent, 1-3 parts of rust inhibitor and 1-3 parts of air entraining agent. The grouting agent has high water reducing rate, excellent strength performance and excellent bleeding performance.
Description
Technical Field
The invention belongs to the technical field of grouting agents, and particularly relates to a high-performance prestressed pipeline grouting agent.
Background
The prestressed concrete member has the characteristics of high rigidity, high strength, strong shearing resistance and good fatigue resistance, can effectively reduce the size of the cross section of the structure, reduce the self weight, prevent cracking and reduce deflection, and is widely applied to the structural design of highways and large-span concrete bridges. The channel grouting is the most important link for protecting the prestressed tendons in the post-tensioned prestressed structure, and the guarantee of good channel grouting quality is a necessary condition for the safety and durability of the prestressed structure. The prestressed duct grouting is to inject grouting material into the reserved prestressed duct, so that the grouting material fully wraps the prestressed tendon, thereby playing the role of the prestressed member. The excellent grouting material can effectively prevent the corrosion of the prestressed steel, ensure the effective stress transfer between the prestressed tendon and the concrete structure, ensure that the slurry in the pore canal is full and compact, the slurry keeps a certain pH value, completely wraps the prestressed steel, and has higher strength, elastic modulus, bonding force and expansion non-contractibility after the slurry is hardened.
In recent years, structural damage has occurred due to poor grouting materials. The performance of post-tensioned prestressed grouting materials is increasingly attracting attention of engineers. The technical Specification for construction of bridges and culverts on roads (JTG/TF50-2011) and the grouting agent for prestressed ducts (GB/T25182-2010) have high requirements on various performance indexes of grouting materials. However, the domestic grouting material still has the common technical problems of large water cement ratio, easy segregation, poor expansion degree, low rupture and compression strength and the like.
In the prior art, CN108373523A discloses an organic-inorganic hybrid polycarboxylate water reducer, which has inorganic nano silica particles on the polycarboxylate water reducer molecule, so that the water reducer not only contains water reducing characteristics, but also contains size effect of inorganic particles. The grouting agent containing the water reducing agent is added into concrete, so that the dispersibility and the fluidity of the concrete are improved, and the early strength of the concrete is increased. But its compressive strength and flexural strength still remain to be improved. CN108975746A discloses a polycarboxylate water reducer containing siloxy groups. When the grouting agent containing the water reducing agent is added into concrete, excellent retarding and plasticity-maintaining effects can be shown. But its compressive strength and flexural strength still remain to be improved.
Disclosure of Invention
Based on the above, the invention provides a prestressed duct grouting agent and a preparation method thereof, wherein the grouting agent comprises the following contents:
a prestressed duct grouting agent comprises the following components in parts by weight: 40-60 parts of fly ash, 8-15 parts of organic silicon modified polycarboxylic acid type water reducing agent, 2-5 parts of reinforcing fiber, 10-20 parts of expanding agent, 3-10 parts of early strength agent, 1-3 parts of defoaming agent, 1-3 parts of rust inhibitor and 1-3 parts of air entraining agent.
Further, the reinforcing fiber is silicon nitride fiber; the length of the silicon nitride fiber is 100-200 mu m.
Further, the preparation method of the organic silicon modified polycarboxylic acid type water reducing agent comprises the following steps: heating methyl cyclosiloxane, tetravinyl cyclotetrasiloxane and vinyl end-capping agent under the action of a catalyst to react to obtain vinyl polysiloxane; gradually dropwise adding mixed liquid of vinyl polysiloxane, carboxylic acid type reaction monomer, initiator and chain transfer agent into unsaturated polyether under a heating state, carrying out polymerization reaction, removing low, and drying to obtain the organic silicon modified polycarboxylic acid type water reducer.
Further, the weight part ratio of the methyl cyclosiloxane, the tetravinyl cyclotetrasiloxane and the vinyl end-capping agent is 7-5: 4-3: 2-1.
Further, the weight ratio relation of the unsaturated polyether, the vinyl polysiloxane and the carboxylic acid type reaction monomer is 50-80: 1: 8-12.
Further, the methyl cyclosiloxane is selected from at least one of octamethylcyclotetrasiloxane, hexamethylcyclotrisiloxane, decamethylcyclopentasiloxane and dodecamethylcyclohexasiloxane; the unsaturated polyether is allyl alcohol polyoxyethylene ether; the catalyst is selected from potassium silanolate; the vinyl end-capping agent is at least one selected from dimethylvinylethoxysilane, divinyltetramethyldisiloxane or dimethylvinylmethoxysilane; the carboxylic acid type reaction monomer is selected from at least one of acrylic acid, methacrylic acid, itaconic acid and fumaric acid; the initiator is selected from at least one of ammonium persulfate and sodium persulfate; the chain transfer agent is selected from at least one of dodecyl mercaptan and hexadecyl mercaptan.
The unsaturated polyether is a commercial product, and the number average molecular weight is 1200-2400. Preferably 1800. Preferably from lake stone chemical (Jiaxing) Inc.
Further, the initiator accounts for 0.6-0.8% of the carboxylic acid type reaction monomer.
Further, the chain transfer agent accounts for 0.2 to 0.25% of the carboxylic acid type reactive monomer.
Further, the preparation method of the organic silicon modified polycarboxylic acid type water reducing agent comprises the following steps: and (3) dehydrating the reaction material. Adding 50-70 parts of methyl cyclosiloxane and 0.1-0.4 part of potassium silanol into a reaction kettle provided with a thermometer, a mechanical stirrer, a nitrogen guide pipe and a condenser, stirring and heating, and introducing nitrogen for 20-50min when heating to 30-50 ℃. Then the temperature is raised to 140 ℃ and 150 ℃ for reaction for 3-5 h. And adding 30-40 parts of tetravinyl cyclotetrasiloxane and 10-20 parts of vinyl end-capping agent into the reaction kettle, and continuing to react for 2-4 hours. And after the polymerization reaction is finished, vacuumizing to remove unreacted monomers to obtain the vinyl polysiloxane.
Further, the number average molecular weight of the vinyl polysiloxane is in the range of 1000-2000, and the weight average molecular weight is in the range of 2000-3000.
Further, 50-80 parts of unsaturated polyether is added into a reaction kettle provided with a thermometer, a mechanical stirrer, a nitrogen guide pipe and a condenser, stirred and heated to 50-80 ℃, and mixed liquid of 1 part of vinyl polysiloxane, 8-12 parts of carboxylic acid type reaction monomer, 0.6-0.8% of initiator of the carboxylic acid type reaction monomer and 0.2-0.25% of chain transfer agent of the carboxylic acid type reaction monomer is gradually dripped, and the reaction lasts for 3-5 hours. And after the reaction is finished, drying in vacuum at 40-60 ℃ to obtain the organic silicon modified polycarboxylic acid type water reducer.
Further, the number average molecular weight of the organic silicon modified polycarboxylic acid type water reducing agent is 80000-120000, and the weight average molecular weight is 120000-160000.
Further, the mass ratio of the fly ash to the reinforcing fiber to the organic silicon modified polycarboxylic acid type water reducing agent is 20-30:1-2: 5-7.
Further, the mass ratio of the particle size distribution of the fly ash is 5-10 μm to 10-20 μm: 20-50 μm ═ 5-10:2-5: 1.
Further, the expanding agent is a sulphoaluminate expanding agent or an aluminate expanding agent; the early strength agent is an anhydrous sodium sulfate early strength agent or a formate early strength agent; the defoaming agent is an emulsified silicone oil defoaming agent or a polydimethylsiloxane defoaming agent; the rust inhibitor is an amino alcohol rust inhibitor or an alkylamide acid salt rust inhibitor; the air entraining agent is an aluminum powder air entraining agent or a sodium dodecyl benzene sulfonate air entraining agent.
A preparation method of the prestressed duct grouting agent comprises the following steps: adding the fly ash into a stirrer, stirring for 10-20 minutes at the rotating speed of 1000-1500 rpm, sequentially adding a water reducing agent, an expanding agent, an early strength agent, a defoaming agent, a rust inhibitor and an air entraining agent, stirring for 3-5 minutes after adding each component, finally adding reinforcing fibers, stirring for 5-8 minutes at the rotating speed of 500-800 rpm after adding the reinforcing fibers, and inspecting and packaging after stirring.
Unless otherwise specified, "parts" in the present invention mean parts by weight, and "%" means mass%.
Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
1. the main component of the cement is calcium silicate, and the fly ash is an inorganic component taking silicon dioxide and aluminum oxide as main components. The organic silicon modified polycarboxylic acid type water reducing agent is designed and introduced with a polysiloxane chain segment on the basis of the structure of the traditional high-efficiency polycarboxylic acid type water reducing agent, so that the organic silicon modified polycarboxylic acid type water reducing agent can be better fused and adsorbed with fly ash and cement, can promote cement particles to show better dispersity, and improves the compressive strength and the flexural strength of the cement. The introduction of the siloxane functional group improves the hydrophobic property and the impermeability of the cement base material, thereby improving the water reducing effect.
2. The addition of the organic silicon modified polycarboxylic acid type water reducing agent can enable the cement base material to achieve the technical effects of high water reducing rate, good reinforcing effect, good fluidity of the mixture, good fluidity retentivity, stable volume, low shrinkage rate and the like.
3. The fiber is added into the grouting agent and is stably and uniformly dispersed in the grouting agent, so that the contact between the fiber and the grouting agent and between the fiber and the cement can be effectively improved, the silicon nitride fiber has unique physical and chemical properties, and the effective addition of the silicon nitride fiber can obviously improve the flexural strength of a final product.
4. The effect of the silicon nitride fiber for enhancing the flexural strength is influenced by the fiber length, the fiber adding amount, the proportion of the silicon nitride fiber to other components and the like, for example, if the fiber length is too short, the flexural strength is not obviously enhanced, and if the fiber length is too long, the compressive strength is easily reduced; according to the invention, parameters such as the length and the dosage of the silicon nitride fiber, the particle size distribution of the fly ash and the like are controlled, so that the final product has excellent breaking strength.
5. The grouting agent of the invention forms an integral product through the content control of each component, and plays an important individual role and a synergistic effect among the components for the performance of the final product; the inventor controls the content of each component, especially the dosage of the fly ash, the reinforcing fiber and the organic silicon modified water reducing agent, so that the final product has beneficial comprehensive performance.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. However, the present invention may be embodied in many different forms of blood and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Example 1
The preparation process of the organic silicon modified polycarboxylic acid type water reducing agent comprises the following steps: and (3) dehydrating the reaction material. 50g of octamethylcyclotetrasiloxane and 0.25g of potassium silanolate are added into a reaction kettle equipped with a thermometer, a mechanical stirrer, a nitrogen guide pipe and a condenser, stirred and heated, and nitrogen is introduced for 30min when the temperature is heated to 40 ℃. Then the temperature is increased to 150 ℃ to react for 3 h. 30g of tetravinyl cyclotetrasiloxane and 12g of divinyltetramethyldisiloxane are added into the reaction kettle and the reaction is continued for 3 hours. And after the polymerization reaction is finished, vacuumizing to remove unreacted monomers to obtain the vinyl polysiloxane. The vinylpolysiloxane was tested to have a number average molecular weight Mn of 1876 and a weight average molecular weight Mw of 2739. The molecular weight distribution (Mw/Mn) was 1.46.
250g of allyl alcohol polyoxyethylene ether with the number average molecular weight of 1800 and 70g of water are added into a reaction kettle provided with a thermometer, mechanical stirring, a nitrogen guide pipe and a condenser, stirred and heated to 70 ℃, and a mixed solution of 5g of vinyl polysiloxane, 45g of acrylic acid, 15g of methacrylic acid, 0.36g of ammonium persulfate and 0.12g of dodecyl mercaptan is gradually added dropwise for reaction for 5 hours. And after the reaction is finished, drying in vacuum at the temperature of 45 ℃ to obtain the organic silicon modified polycarboxylic acid type water reducer. The number average molecular weight Mn of the organic silicon modified polycarboxylic acid type water reducing agent is 108000, and the weight average molecular weight Mw is 144720. The molecular weight distribution (Mw/Mn) was 1.34.
The grouting agent comprises the following components in parts by weight:
50 parts of II-grade low-calcium fly ash, 12 parts of organic silicon modified polycarboxylic acid type water reducing agent, 3 parts of silicon nitride fiber with the average length of 150 mu m, 15 parts of UEA expanding agent, 6 parts of anhydrous sodium sulfate early strength agent, 2 parts of polydimethylsiloxane defoaming agent, 2 parts of MuCismia200 rust inhibitor and 2 parts of aluminum powder air entraining agent; the mass ratio of the particle size distribution of the fly ash is 5-10 mu m to 10-20 mu m: 20-50 μm-8: 4: 1.
The preparation process of the grouting agent comprises the following steps:
adding the fly ash into a stirrer, stirring for 15 minutes at the rotating speed of 1200 rpm, sequentially adding a water reducing agent, an expanding agent, an early strength agent, a defoaming agent, a rust inhibitor and an air entraining agent, stirring for 4 minutes after adding each component, finally adding silicon nitride fiber, stirring for 6 minutes at the rotating speed of 600 rpm after adding the silicon nitride fiber, and inspecting and packaging after stirring.
The construction process comprises the following steps:
the grouting agent and the golden corner brand P.O42.5 cement are uniformly mixed according to the proportion of the cement to the grouting agent of 90:10, the water-cement ratio is 0.28, and the performance of the cement paste obtained by side is shown in Table 1.
Example 2
The preparation process of the organic silicon modified polycarboxylic acid type water reducing agent comprises the following steps: and (3) dehydrating the reaction material. 20g of decamethylcyclopentasiloxane, 40g of octamethylcyclotetrasiloxane and 0.3g of potassium silanolate are added into a reaction kettle equipped with a thermometer, a mechanical stirrer, a nitrogen guide pipe and a condenser, stirred and heated, and nitrogen is introduced for 30min when the temperature is heated to 40 ℃. Then the temperature is increased to 150 ℃ to react for 3 h. Then 30g of tetravinyl cyclotetrasiloxane, 5g of dimethylvinylmethoxysilane and 10g of divinyltetramethyldisiloxane are added into the reaction kettle and the reaction is continued for 3 hours. And after the polymerization reaction is finished, vacuumizing to remove unreacted monomers to obtain the vinyl polysiloxane. The vinylpolysiloxane was found to have a number average molecular weight Mn of 1923, a weight average molecular weight Mw of 2711 and a molecular weight distribution (Mw/Mn) of 1.41.
A reaction vessel equipped with a thermometer, mechanical stirrer, nitrogen inlet and condenser was charged with 400g of allyl alcohol polyoxyethylene ether having a number average molecular weight of 2400 and 200g of water, heated to 70 ℃ with stirring, and a mixture of 5g of vinyl polysiloxane, 20g of acrylic acid, 20g of fumaric acid, 0.32g of sodium persulfate and 0.1g of hexadecyl mercaptan was gradually added dropwise, followed by reaction for 5 hours. And after the reaction is finished, drying in vacuum at 50 ℃ to obtain the organic silicon modified polycarboxylic acid type water reducer. The number average molecular weight Mn of the organic silicon modified polycarboxylic acid type water reducing agent is 96450, and the weight average molecular weight Mw is 120562. The molecular weight distribution (Mw/Mn) was 1.25.
The grouting agent comprises the following components in parts by weight:
55 parts of II-grade low-calcium fly ash, 12 parts of organic silicon modified polycarboxylic acid type water reducing agent, 4 parts of silicon nitride fiber with the average length of 100 mu m, 15 parts of UEA expanding agent, 8 parts of anhydrous sodium sulfate early strength agent, 2 parts of polydimethylsiloxane defoaming agent, 2 parts of MuCismia200 rust inhibitor and 2 parts of sodium dodecyl benzene sulfonate air entraining agent; the mass ratio of the particle size distribution of the fly ash is 5-10 mu m to 10-20 mu m: 20-50 μm-10: 5: 1.
The preparation process of the grouting agent comprises the following steps:
adding the fly ash into a stirrer, stirring for 10 minutes at the rotating speed of 1500 revolutions per minute, then sequentially adding a water reducing agent, an expanding agent, an early strength agent, a defoaming agent, a rust inhibitor and an air entraining agent, stirring for 5 minutes after adding each component, finally adding silicon nitride fibers, stirring for 8 minutes at the rotating speed of 600 revolutions per minute after adding the silicon nitride fibers, and inspecting and packaging after stirring.
The construction process comprises the following steps:
the grouting agent and the kui-qi brand p.o42.5 cement are uniformly mixed according to the ratio of the cement to the grouting agent of 99:10, the water-cement ratio is 0.28, and the measured performance of the cement slurry is shown in table 1.
Example 3
The preparation process of the organic silicon modified polycarboxylic acid type water reducing agent comprises the following steps: and (3) dehydrating the reaction material. 50g of octamethylcyclotetrasiloxane and 0.25g of potassium silanolate are added into a reaction kettle equipped with a thermometer, a mechanical stirrer, a nitrogen guide pipe and a condenser, stirred and heated, and nitrogen is introduced for 30min when the temperature is heated to 40 ℃. Then the temperature is increased to 150 ℃ to react for 3 h. 30g of tetravinyl cyclotetrasiloxane and 12g of divinyltetramethyldisiloxane are added into the reaction kettle and the reaction is continued for 3 hours. And after the polymerization reaction is finished, vacuumizing to remove unreacted monomers to obtain the vinyl polysiloxane. The vinylpolysiloxane was tested to have a number average molecular weight Mn of 1876 and a weight average molecular weight Mw of 2739. The molecular weight distribution (Mw/Mn) was 1.46.
300g of allyl alcohol polyoxyethylene ether having a number average molecular weight of 2000 and 120g of water were put into a reaction vessel equipped with a thermometer, mechanical stirring, a nitrogen introduction tube and a condenser, and heated to 70 ℃ with stirring, and a mixed solution of 5g of vinyl polysiloxane, 10g of acrylic acid, 10g of methacrylic acid, 0.12g of sodium persulfate and 0.04g of dodecyl mercaptan was gradually added dropwise, followed by reaction for 5 hours. And after the reaction is finished, drying in vacuum at the temperature of 45 ℃ to obtain the organic silicon modified polycarboxylic acid type water reducer. The number average molecular weight Mn of the organic silicon modified polycarboxylic acid type water reducing agent is 110800, and the weight average molecular weight Mw is 154012. The molecular weight distribution (Mw/Mn) was 1.39.
The components of the grouting agent in parts by weight, the preparation process and the construction process of the grouting agent are the same as those in the embodiment 1.
Example 4
The preparation process of the organic silicon modified polycarboxylic acid type water reducing agent comprises the following steps: and (3) dehydrating the reaction material. 20g of decamethylcyclopentasiloxane, 40g of octamethylcyclotetrasiloxane and 0.3g of potassium silanolate are added into a reaction kettle equipped with a thermometer, a mechanical stirrer, a nitrogen guide pipe and a condenser, stirred and heated, and nitrogen is introduced for 30min when the temperature is heated to 40 ℃. Then the temperature is increased to 150 ℃ to react for 3 h. Then 30g of tetravinyl cyclotetrasiloxane, 5g of dimethylvinylmethoxysilane and 10g of divinyltetramethyldisiloxane are added into the reaction kettle and the reaction is continued for 3 hours. And after the polymerization reaction is finished, vacuumizing to remove unreacted monomers to obtain the vinyl polysiloxane. The vinylpolysiloxane was found to have a number average molecular weight Mn of 1923, a weight average molecular weight Mw of 2711 and a molecular weight distribution (Mw/Mn) of 1.41.
A reaction kettle equipped with a thermometer, a mechanical stirrer, a nitrogen guide pipe and a condenser is added with 450g of allyl alcohol polyoxyethylene ether with the number average molecular weight of 1800 and 200g of water, stirred and heated to 70 ℃, and a mixed solution of 5g of vinyl polysiloxane, 40g of acrylic acid, 40g of fumaric acid, 0.64g of ammonium persulfate and 0.2g of hexadecyl mercaptan is gradually added dropwise for reaction for 5 hours. And after the reaction is finished, drying in vacuum at 50 ℃ to obtain the organic silicon modified polycarboxylic acid type water reducer. The number average molecular weight Mn of the organic silicon modified polycarboxylic acid type water reducing agent is 118500, and the weight average molecular weight Mw is 152865. The molecular weight distribution (Mw/Mn) was 1.29.
The components of the grouting agent in parts by weight, the preparation process and the construction process of the grouting agent are the same as those in the embodiment 2.
Example 5
The preparation process, grouting agent preparation process and construction process of the organic silicon modified polycarboxylic acid type water reducing agent are the same as those in example 1.
The grouting agent comprises the following components in parts by weight:
50 parts of II-grade low-calcium fly ash, 9 parts of organic silicon modified polycarboxylic acid type water reducing agent, 5 parts of silicon nitride fiber with the average length of 150 mu m, 15 parts of UEA expanding agent, 6 parts of anhydrous sodium sulfate early strength agent, 2 parts of polydimethylsiloxane defoaming agent, 2 parts of MuCismia200 rust inhibitor and 2 parts of aluminum powder air entraining agent; the mass ratio of the particle size distribution of the fly ash is 5-10 mu m to 10-20 mu m: 20-50 μm-8: 4: 1.
Table 1 examples 1-5 cement slurry properties
Comparative example 1
The other conditions and method are the same as in example 1, except that the water reducing agent is prepared by the following steps: 400g of allyl alcohol polyoxyethylene ether with the number average molecular weight of 1800 and 200g of water are added into a reaction kettle provided with a thermometer, a mechanical stirrer, a nitrogen guide pipe and a condenser, stirred and heated to 70 ℃, and a mixed solution of 45g of acrylic acid, 15g of methacrylic acid, 0.36g of sodium persulfate and 0.12g of dodecyl mercaptan is gradually added dropwise for reaction for 5 hours. And after the reaction is finished, drying in vacuum at the temperature of 45 ℃ to obtain the polycarboxylic acid type water reducing agent. The polycarboxylic acid type water reducing agent is tested to have the number average molecular weight Mn of 109600 and the weight average molecular weight Mw of 138096. The molecular weight distribution (Mw/Mn) was 1.26.
Comparative example 2
The other conditions and methods were the same as in example 1 except that the water reducing agent was replaced with AP-45 manufactured by Korean JNT.
It was found that the cement slurries of comparative example 1 and comparative example 2 have little difference in setting time, fluidity, bleeding rate, pressure bleeding rate, free expansion degree, etc. from the cement slurry of example 1, and the decrease in compression and flexural strength is significant, and the compression and flexural strength of comparative examples 1 and 2 is as follows compared with that of example 1:
TABLE 2 comparison of the respective strength values of comparative examples 1, 2 and example 1
Comparative example 3
The other conditions and methods were the same as in example 2 except that the water-reducing agent was replaced with NC-J produced by the institute of construction and science in Shandong province.
The cement slurry and the cement slurry in the embodiment 2 have little difference in setting time, fluidity, bleeding rate, pressure bleeding rate, free expansion degree and the like, and the compression strength and the breaking strength are obviously reduced, and the compression strength and the breaking strength of the comparative example 3 are compared with those of the embodiment 2 as follows:
TABLE 3 comparison of the respective strength values of comparative example 3 and example 2
Comparative examples 4 to 5
The other conditions and methods are the same as those of example 1, except that the silicon nitride fiber is replaced by the glass fiber (comparative example 4) and the carbon fiber (comparative example 5) with the same length and content, and the cement slurry of example 1 are measured to have small difference in setting time, fluidity, bleeding rate, pressure bleeding rate, free expansion degree and the like, and have obvious reduction in compression strength and rupture strength, and the compression strength and rupture strength of the comparative examples 4-5 are compared with those of example 1 as follows:
TABLE 3 comparison of the respective strength values of comparative examples 4 to 5 and example 1
Comparative example 6
In comparison with example 2, comparative example 6, in which carbon fibers having the same length and an AP-45 water reducing agent manufactured by korean JNT were used instead of the silicon nitride fibers and the organic silicon modified polycarboxylic acid type water reducing agent in example 2, respectively, it was found that the cement paste was not much different from the cement paste of example 2 in setting time, fluidity, bleeding rate, pressure bleeding rate, free expansion degree, etc., and was remarkably decreased in compression and rupture strength, and comparative example 6 was compared with example 2 in compression and rupture strength as follows:
TABLE 4 comparison of the respective strength values of comparative example 5 and example 2
In addition, the inventors also found that if the silicon nitride content is less than 2 parts by weight or more than 5 parts by weight, or silicon nitride fibers having a length of other than 100-.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The prestressed duct grouting agent is characterized by comprising the following components in parts by weight: 40-60 parts of fly ash, 8-15 parts of organic silicon modified polycarboxylic acid type water reducing agent, 2-5 parts of reinforcing fiber, 10-20 parts of expanding agent, 3-10 parts of early strength agent, 1-3 parts of defoaming agent, 1-3 parts of rust inhibitor and 1-3 parts of air entraining agent.
2. The grout of claim 1, wherein said reinforcing fibers are silicon nitride fibers; the length of the silicon nitride fiber is 100-200 mu m.
3. The grouting agent of claim 1, wherein the organosilicon modified polycarboxylic acid type water reducing agent is prepared by the following steps: heating methyl cyclosiloxane, tetravinyl cyclotetrasiloxane and vinyl end-capping agent under the action of a catalyst to react to obtain vinyl polysiloxane; gradually dropwise adding mixed liquid of vinyl polysiloxane, carboxylic acid type reaction monomer, initiator and chain transfer agent into unsaturated polyether under a heating state, carrying out polymerization reaction, removing low, and drying to obtain the organic silicon modified polycarboxylic acid type water reducer.
4. The grouting agent according to claim 3, wherein the weight ratio of the methylcyclosiloxane to the tetravinyl cyclotetrasiloxane to the vinyl blocking agent is 7-5: 4-3: 2-1.
5. The grouting agent according to claim 3, wherein the weight ratio relationship of the unsaturated polyether, the vinyl polysiloxane and the carboxylic acid type reaction monomer is 50-80: 1: 8-12.
6. The grouting agent according to claim 3, wherein the methylcyclosiloxane is at least one selected from the group consisting of octamethylcyclotetrasiloxane, hexamethylcyclotrisiloxane, decamethylcyclopentasiloxane, and dodecamethylcyclohexasiloxane; the unsaturated polyether is allyl alcohol polyoxyethylene ether; the catalyst is selected from potassium silanolate; the vinyl end-capping agent is at least one selected from dimethylvinylethoxysilane, divinyltetramethyldisiloxane or dimethylvinylmethoxysilane; the carboxylic acid type reaction monomer is selected from at least one of acrylic acid, methacrylic acid, itaconic acid and fumaric acid; the initiator is selected from at least one of ammonium persulfate and sodium persulfate; the chain transfer agent is selected from at least one of dodecyl mercaptan and hexadecyl mercaptan.
7. The grouting agent as claimed in claim 1, wherein the mass ratio of the fly ash, the reinforcing fibers and the organosilicon modified polycarboxylic acid type water reducing agent is 20-30:1-2: 5-7.
8. The grouting agent as claimed in claim 1, wherein the mass ratio of the particle size distribution of the fly ash is 5-10 μm to 10-20 μm: 20-50 μm ═ 5-10:2-5:1, preferably 8-10: 4-5: 1.
9. the grouting agent of claim 1, wherein the swelling agent is a sulphoaluminate swelling agent or an aluminate swelling agent; the early strength agent is an anhydrous sodium sulfate early strength agent or a formate early strength agent; the defoaming agent is an emulsified silicone oil defoaming agent or a polydimethylsiloxane defoaming agent; the rust inhibitor is an amino alcohol rust inhibitor or an alkylamide acid salt rust inhibitor; the air entraining agent is an aluminum powder air entraining agent or a sodium dodecyl benzene sulfonate air entraining agent.
10. The method for preparing the prestressed duct grouting agent as claimed in claim 1, wherein: adding the fly ash into a stirrer, stirring for 10-20 minutes at the rotating speed of 1000-1500 rpm, then adding a water reducing agent, an expanding agent, an early strength agent, a defoaming agent, a rust inhibitor and an air entraining agent, stirring for 3-5 minutes after adding each component, finally adding reinforcing fibers, stirring for 5-8 minutes at the rotating speed of 500-800 rpm after adding the reinforcing fibers, and inspecting and packaging after stirring.
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| CN112500021A (en) * | 2021-01-05 | 2021-03-16 | 郑州聚砼汇实业有限公司 | Novel grouting agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107311591A (en) * | 2017-08-01 | 2017-11-03 | 合肥欧仕嘉机电设备有限公司 | A kind of new grouting material and preparation method thereof |
| CN108975746A (en) * | 2018-08-01 | 2018-12-11 | 上海台界化工有限公司 | A kind of synthetic method of the polycarboxylate water-reducer containing siloxy |
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| CN107311591A (en) * | 2017-08-01 | 2017-11-03 | 合肥欧仕嘉机电设备有限公司 | A kind of new grouting material and preparation method thereof |
| CN108975746A (en) * | 2018-08-01 | 2018-12-11 | 上海台界化工有限公司 | A kind of synthetic method of the polycarboxylate water-reducer containing siloxy |
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| CN112500021A (en) * | 2021-01-05 | 2021-03-16 | 郑州聚砼汇实业有限公司 | Novel grouting agent |
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