CN114804707A - Thixotropic agent for ultrahigh-performance sprayed concrete and preparation method and device thereof - Google Patents
Thixotropic agent for ultrahigh-performance sprayed concrete and preparation method and device thereof Download PDFInfo
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- CN114804707A CN114804707A CN202210511204.6A CN202210511204A CN114804707A CN 114804707 A CN114804707 A CN 114804707A CN 202210511204 A CN202210511204 A CN 202210511204A CN 114804707 A CN114804707 A CN 114804707A
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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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0085—Thixotropic agents
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Abstract
The invention discloses a thixotropic agent for ultra-high performance sprayed concrete and a preparation method and a device thereof, belonging to the technical field of ultra-high performance concrete for spraying building materials, wherein the thixotropic agent comprises the following components in parts by weight: 250-500 parts of aluminum sulfate; 5-15 parts of aluminum hydroxide gel; 10-40 parts of a crystal nucleus early strength agent; 10-35 parts of triethanolamine; 30-90 parts of silicon phosphate; 0.5-4 parts of trimellitic anhydride; 1-10 parts of disodium ethylene diamine tetraacetate; 5-20 parts of sodium polyphosphate; 0.5-4 parts of cellulose ether; 250-520 parts of deionized water. The preparation method comprises weighing; adding deionized water; adding the mixture to a preparation device; adding triethanolamine and crystal nucleus early strength agent. The device comprises a reaction kettle, a jacket, a driving mechanism, a stirring mechanism, a feeding column and an outer tube. The thixotropic agent has good stability, proper price, good thixotropic property, high early strength and good effect.
Description
Technical Field
The invention relates to the technical field of ultra-high performance concrete for spraying building materials, in particular to a thixotropic agent for the ultra-high performance sprayed concrete and a preparation method and a device thereof.
Background
At present, an alkali-free accelerator is often added into liquid ultrahigh-performance sprayed concrete to enable the concrete to be quickly thixotropic, thickened and hardened, but the alkali-free accelerator has the defects of poor adaptability and large resilience (more than 30%), and can cause a series of problems of high cost, high doping amount (7-9%), low 28d strength, large later strength loss (more than 40%), the highest strength can only reach 45mpa, the content of added alkali exceeds the standard, and the like. If sodium fluoride is added into a plurality of alkali-free setting accelerator raw materials, the alkali content is more than 1 percent after the usage amount, and the alkali content requirement of the alkali-free setting accelerator is not met; the coagulation property is good, but the strength of 1d and 28d is lower, generally about 12mpa a day and 45mpa twenty eight days, respectively, the later strength is reversed, and various adverse factors restrict occasions with special requirements, such as national defense engineering, ocean engineering, nuclear industry, special security and protection engineering and the field of municipal trenchless reinforcement engineering.
In view of the above, the invention provides a thixotropic agent for ultra-high performance sprayed concrete, and a preparation method and a device thereof, so as to solve the defects of the existing accelerator technology.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a thixotropic agent for ultra-high-performance sprayed concrete and a preparation method and a preparation device thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
a thixotropic agent for ultra-high performance sprayed concrete comprises the following components in parts by weight:
250-500 parts of aluminum sulfate; 5-15 parts of aluminum hydroxide gel; 10-40 parts of a crystal nucleus early strength agent; 10-35 parts of triethanolamine; 30-90 parts of silicon phosphate; 0.5-4 parts of trimellitic anhydride; 1-10 parts of disodium ethylene diamine tetraacetate; 5-20 parts of sodium polyphosphate; 0.5-4 parts of cellulose ether; 250-520 parts of deionized water.
More preferably: the composition comprises the following components in parts by weight:
400 parts of aluminum sulfate; 12 parts of aluminum hydroxide gel; 35 parts of crystal nucleus early strength agent; 25 parts of triethanolamine; 60 parts of silicon phosphate; 2 parts of trimellitic anhydride; 4 parts of ethylene diamine tetraacetic acid disodium salt; 5 parts of sodium polyphosphate; 1 part of cellulose ether; 520 parts of deionized water.
More preferably: the aluminum sulfate is one or two of 18-water aluminum sulfate and polyaluminum sulfate which are optionally mixed.
More preferably: the crystal nucleus early strength agent is an organic/inorganic hybrid nano-micron scale cement hydration accelerator.
More preferably: the cellulose ether is one or a mixture of three of water-soluble high-molecular hydroxymethyl cellulose ether, hydroxyethyl cellulose ether and hydroxypropyl cellulose ether in any proportion.
A preparation method of a thixotropic agent for ultra-high performance sprayed concrete comprises the following steps:
s1, weighing the components according to the weight parts of the raw materials of the thixotropic agent for the ultra-high performance sprayed concrete;
s2, putting deionized water into the preparation device, heating to 70-90 ℃, then cooling to 60 ℃, and keeping;
s3, mixing the weighed aluminum sulfate, silicon phosphate, sodium polyphosphate, trimellitic anhydride, ethylene diamine tetraacetic acid and cellulose ether to obtain a mixture; adding the mixture into the preparation device in the step S2, performing intermittent forward and backward stirring at the speed of 120-300 r/min, adding aluminum hydroxide gel after the solid is completely dissolved, continuously stirring at the speed of 80-150 r/min for 15min, and cooling to normal temperature;
s4, adding triethanolamine and the crystal nucleus early strength agent at normal temperature, continuously stirring for 20min at the speed of 80-150 r/min, and filling to obtain the finished product.
More preferably: in the adding process of the mixture, firstly, pouring the mixture into a feeding column of the preparation device, and then starting a driving mechanism on the preparation device to drive the feeding column to move up and down so as to enable the mixture to be in intermittent contact with the deionization; and in the up-and-down moving process of the feeding column, the stirring mechanism on the preparation device can stir the deionized water in the positive and negative directions.
The utility model provides a preparation facilities of thixotropic agent for ultra-high performance shotcrete which characterized in that: comprises a reaction kettle, a jacket, a driving mechanism, a stirring mechanism, a feeding column and an outer tube;
the feeding column comprises a column body and a through hole, the column body is arranged in a hollow manner and inserted in the outer tube, a feed opening is formed in the upper part of the column body, a porous layer is arranged on the lower part of the column body, and the porous layer is arranged on the peripheral surface of the column body;
the driving mechanism is positioned above the reaction kettle and is used for driving the column body to move up and down in the outer pipe so that the column body extends out of the lower end of the outer pipe and downwards extends into deionized water, and the through holes are positioned on the periphery of the lower part of the column body;
the stirring mechanism is positioned in the reaction kettle, and in the process that the column body moves up and down, the stirring mechanism stirs the materials in the reaction kettle.
More preferably: the driving mechanism comprises a motor, a main shaft, a cam and a supporting frame;
the support frame is fixed above the top of the reaction kettle, the motor is installed on the support frame, one end of the main shaft is fixed with the output shaft of the motor, the other end of the main shaft penetrates through the cam and is fixedly connected with the cam, the cam is positioned above the column body, and the upper end of the column body is provided with a fillet and is in contact with the circumferential surface of the cam;
the reaction kettle is characterized in that a spring and a top plate are arranged above the top of the reaction kettle, the lower end of the spring is fixed to the top of the reaction kettle, the upper end of the spring is fixed to the top plate, and the top plate is located on two opposite sides of the column body and fixedly connected to one side of the upper portion of the column body.
More preferably: the stirring mechanism comprises a stirring shaft, a stirring paddle, a mobile platform and a sliding ring;
the stirring shaft is vertically arranged and positioned between the outer pipe and the inner wall of the reaction kettle, the upper end of the stirring shaft is inserted into the top in the reaction kettle, the lower end of the stirring shaft is inserted into the bottom in the reaction kettle, the stirring paddle is fixed on the surface of the stirring shaft and is used for stirring materials in the reaction kettle, the upper part of the stirring shaft is provided with an external thread, the stirring shaft penetrates through the moving platform, and the moving platform is in threaded fit with the external thread on the stirring shaft;
the mobile station is fixedly connected with the sliding ring, the sliding ring is sleeved on the outer surface of the outer pipe, a connector is arranged on the circumferential surface of the cylinder, the connector is in contact with the inner wall of the outer pipe, and the connector is magnetically connected with the sliding ring.
In conclusion, the invention has the following beneficial effects: the thixotropic agent is an additive which is mixed into concrete to make the concrete thixotropic and thick quickly and not harden quickly. The main function is to accelerate thickening and thixotropy of cement, form enough thixotropy and bonding strength in a short time, and realize three targets of spraying, hanging and good performance of UHPC. So as to ensure the requirements of special construction.
The thixotropic agent for the liquid ultrahigh-performance sprayed concrete changes the defects that the hydration heat of an accelerator is high and concentrated, temperature cracks are easily generated, and the loss of the later strength is against the special engineering material with ultrahigh strength, toughness, high durability and macroscopic defect-free performance of UHPC ultrahigh-performance concrete.
The thixotropic agent for the liquid ultrahigh-performance sprayed concrete overcomes the defect that the liquid is quickly solidified after being sprayed and cannot be repaired and corroded for the second time, and in certain specific projects needing smooth surfaces, such as underground trenchless reinforcement projects, the wall body reinforced fair-faced concrete cannot be formed in one step, and the back face cannot be compacted under the obstruction of reinforcing steel bars.
The thixotropic agent for the liquid ultrahigh-performance sprayed concrete has the advantages of small damage to a human body, adhesion after spraying, no loss of later strength, no adverse effect on the durability of the concrete, no dust, low resilience and the like. Compared with the existing accelerator for sprayed concrete, the thixotropic agent has the advantages of low cost of raw materials, simple and convenient construction, strong adhesion, low resilience and no loss of later strength, is an optimal additive for UHPC (ultra high performance) sprayed concrete, and can also replace the existing accelerator to prepare a new generation product of high-strength concrete. And has obvious technical and economic advantages, is beneficial to the production and popularization of products, and has wide application prospect.
Drawings
FIG. 1 is a schematic sectional view of an embodiment, mainly used for embodying the structure of a production apparatus;
FIG. 2 is a schematic partial cross-sectional view of an embodiment, which is mainly used for embodying the matching structure of the stirring mechanism and the feeding column;
fig. 3 is a schematic partial sectional view of an embodiment, which is mainly used for embodying the structure of a feed column.
In the figure, 1, a reaction kettle; 2. a jacket; 3. a heat exchange medium outlet; 4. a heat exchange medium inlet; 5. a feed inlet; 6. a discharge port; 71. a motor; 72. a main shaft; 73. a cam; 74. a support frame; 81. a stirring shaft; 82. a stirring paddle; 83. an external thread; 84. a mobile station; 85. a sliding ring; 9. a feed column; 91. a cylinder; 92. a linker; 93. perforating; 94. a porous layer; 10. an outer tube; 11. a chute; 12. a feeding port; 13. a top plate; 14. a spring.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
Example 1: a thixotropic agent for ultra-high performance sprayed concrete and a preparation method and a device thereof are disclosed, wherein the thixotropic agent for ultra-high performance sprayed concrete comprises the following components by weight:
450g of aluminum sulfate; 15g of aluminum hydroxide gel; 30g of crystal nucleus early strength agent; 30g of triethanolamine; 60g of silicon phosphate; trimellitic anhydride 3 g; 6g of ethylene diamine tetraacetic acid disodium salt; 10g of sodium polyphosphate; 2g of cellulose ether; 500g of deionized water.
Specifically, aluminum sulfate as an early strength thixotropic material reacts with cement to form calcium sulfoaluminate (ettringite) thickening, thixotropic and early strength. The aluminum sulfate is one or two of 18-water aluminum sulfate and polyaluminum sulfate, and in the embodiment, the aluminum sulfate is 18-water aluminum sulfate.
Specifically, the aluminum hydroxide gel is aluminum hydroxide colloid, which can increase the content of aluminum ions and promote the formation of calcium sulfoaluminate (ettringite).
Specifically, the crystal nucleus early strength agent is an organic/inorganic hybrid nano-micron scale cement hydration accelerator. The crystal nucleus early strength agent is taken as a crystal seed to be introduced into a cement cementing material system, so that C-S-H gel formed by cement hydration can be induced, the cement hydration rate is reduced, the compact formation degree of cement stone is improved, the rapid development of the strength in the hardening period is promoted, the early strength of concrete for 12H is obviously improved, the crystal nucleus early strength agent is different from the traditional early strength agent, the chemical components of the C-S-H hydration accelerator are consistent with those of a cement hydration product C-S-H gel, and harmful substances influencing the durability of a concrete structure are not contained.
Specifically, triethanolamine, i.e., tris (2-hydroxyethyl) amine, is an organic compound that can be considered as a trihydroxy substituent of triethylamine. Similar to other amine compounds, because of the lone pair electrons on the nitrogen atom, the triethanolamine has weak alkalinity and can react with inorganic acid or organic acid to generate salt, the surface activity of the triethanolamine is good stability in a system, and the triethanolamine is an early strength agent and an accelerator of cement in the presence of the salt.
Specifically, the silicon phosphate is prepared by mixing silicon dioxide and phosphoric acid according to a certain proportion and heating to react, and is a white powdery crystal which is non-toxic, tasteless and soluble in water. It can be widely used in the fields of water glass curing agent, special optical glass, high-strength cement, acid-proof adhesive ingredient, waterproof adhesive, nontoxic antirust paint, organic synthesis catalyst, etc. As the existence system of phosphate radical and active silicon is used as the retarding and enhancing component, the hydration time of the cement is controlled, and the construction performance and the strength are prevented from being influenced by quick setting.
Specifically, trimellitic anhydride is a water-soluble surfactant, and the special molecular structure of the trimellitic anhydride can effectively increase the bonding strength, particularly the instant bonding strength, unlike an accelerator which generates the bonding strength by fast hardening, thereby effectively solving the contradiction between the hardening time and the performance.
In particular, disodium Ethylenediaminetetraacetate (EDTA) is a good complexing agent in chemistry. It has six coordination atoms, and the formed complex is called chelate, can be dissolved in water, is an important chelating agent, and can chelate metal ions in the solution to form a complex, so that the system is stable, and the storage stability is increased.
Specifically, sodium polyphosphate is a condensed phosphate with different chain lengths such as dimerization and trimerization, mainly adjusts the pH value, and has strong capability of integrating metal ions so as to make the system more stable.
The cellulose ether is one or any mixture of three of water-soluble high-molecular hydroxymethyl cellulose ether, hydroxyethyl cellulose ether and hydroxypropyl cellulose ether, and has a protective colloid for solution reaction and suspension thickening property. In this example, the cellulose ether is a water-soluble high molecular hydroxymethyl cellulose ether.
Specifically, deionized water is the solvent.
The preparation method of the thixotropic agent for the ultra-high performance sprayed concrete comprises the following steps:
s1, weighing the components according to the weight of the thixotropic agent for the ultra-high performance sprayed concrete;
s2, putting deionized water into the preparation device, heating to 80 ℃, then cooling to 60 ℃, and keeping the temperature;
s3, mixing the weighed aluminum sulfate, silicon phosphate, sodium polyphosphate, trimellitic anhydride, ethylene diamine tetraacetic acid and cellulose ether to obtain a mixture; adding the mixture into the preparation device in the step S2, performing intermittent forward and backward stirring at the speed of 120-300 r/min, adding aluminum hydroxide gel after the solid is completely dissolved, continuously stirring at the speed of 80-150 r/min for 15min, and cooling to normal temperature;
s4, adding triethanolamine and the crystal nucleus early strength agent at normal temperature, continuing stirring for 20min at the speed of 80-150 r/min, and filling to obtain the thixotropic agent A.
As shown in fig. 1 to 3, the production apparatus comprises a reaction vessel 1, a jacket 2, a driving mechanism, a stirring mechanism, a feed column 9, and an outer tube 10. The reaction kettle 1 is cylindrical, a feed inlet 5 is formed in the top of the reaction kettle 1, a discharge outlet 6 is formed in the bottom of the reaction kettle 1, and the discharge outlet 6 is located in the center of the bottom of the reaction kettle 1. The jacket 2 is wrapped around the surface of the reaction kettle 1, a heat exchange medium inlet 4 and a heat exchange medium outlet 3 are arranged on the jacket 2, and the heat exchange medium can be hot water, steam or other materials. Outer tube 10 is vertical to be set up in reation kettle 1, and the top is fixed at reation kettle 1 internal top in outer tube 10 upper end, and the lower extreme is located reation kettle 1 inside, and outer tube 10 center pin and reation kettle 1 center pin coincidence.
The feeding column 9 comprises a column 91 and a through hole 93, the column 91 is hollow and is inserted in the outer tube 10, and the upper part of the column 91 is provided with a feed opening 12 for pouring the mixture. The lower part of the column 91 is provided with a porous layer 94, the porous layer 94 is arranged on the peripheral surface of the column 91, and a large number of small holes are arranged in the porous layer 94 and can be used as condensation nuclei of bubbles to ensure that the reaction liquid boils stably. The plurality of perforations 93 are provided, the plurality of perforations 93 are evenly distributed around the lower portion of the column 91, and the perforations 93 penetrate through the porous layer 94. The inner bottom surface of the column 91 is a convex surface with the middle part protruding upwards.
The driving mechanism is located above the reaction kettle 1 and is used for driving the column 91 to move up and down in the outer tube 10, so that the column 91 extends out from the lower end of the outer tube 10 and extends downwards into the deionized water. Preferably, the driving mechanism includes a motor 71, a main shaft 72, a cam 73, and a support bracket 74. The support frame 74 is fixed above the top of the reaction kettle 1, the motor 71 is installed on the support frame 74, one end of the main shaft 72 is fixed with the output shaft of the motor 71, and the other end of the main shaft passes through the cam 73 and is fixedly connected with the cam 73. The cam 73 is a disc cam 73 and is located above the cylinder 91, the upper end of the cylinder 91 is arranged in a round angle and is in contact with the circumferential surface of the cam 73, and the length of the cylinder 91 is greater than that of the outer tube 10. A spring 14 and a top plate 13 are arranged above the top of the reaction kettle 1, the spring 14 is located on two opposite sides of the column 91, the lower end of the spring is fixed on the top of the reaction kettle 1, the upper end of the spring is fixed on the top plate 13, and the top plate 13 is located on two opposite sides of the column 91 and is fixedly connected with one side of the upper portion of the column 91.
The stirring mechanism is positioned in the reaction kettle 1, the column 91 is moved up and down, and the stirring mechanism stirs the materials in the reaction kettle 1 in the positive and negative directions. Preferably, the stirring mechanism includes a stirring shaft 81, a stirring paddle 82, a moving table 84, and a sliding ring 85. The stirring shaft 81 is vertically arranged and is positioned between the outer pipe 10 and the inner wall of the reaction kettle 1, the upper end of the stirring shaft 81 is inserted at the top in the reaction kettle 1, and the lower end is inserted at the bottom in the reaction kettle 1. The stirring paddle 82 is fixed on the surface of the stirring shaft 81 and used for stirring the materials in the reaction kettle 1, in order to achieve a good stirring effect, a plurality of stirring shafts 81 can be arranged outside the outer pipe 10, and the plurality of stirring shafts 81 are arranged around the outer pipe 10. The upper surface of the stirring shaft 81 is provided with an external thread 83, the stirring shaft 81 passes through the moving platform 84, and the moving platform 84 is in threaded fit with the external thread 83 on the stirring shaft 81. The moving table 84 is always positioned above the liquid level of the materials in the reaction kettle 1, the moving table 84 is fixedly connected with the sliding ring 85, and the sliding ring 85 is sleeved on the outer surface of the outer tube 10. The cylinder 91 is provided with a connector 92 corresponding to the sliding ring 85 on the circumferential surface, the connector 92 contacts with the inner wall of the outer tube 10, the connector 92 is magnetically connected with the sliding ring 85, specifically, the connector 92 is made of an iron material and provided with a protective layer on the outer surface, the sliding ring 85 is made of a magnet material and provided with a protective layer on the outer surface.
Preferably, in the adding process of the mixture in step S2, the mixture is poured into the feeding column 9 of the preparation device, and then the driving mechanism on the preparation device is started to drive the feeding column 9 to move up and down, so that the mixture is contacted with the deionization batch-type; in the up-and-down moving process of the feeding column 9, the stirring mechanism on the preparation device can stir the deionized water in the positive and negative directions. Specifically, in the process of adding the mixture, the mixture is poured into the feeding column 9 through the feed opening 12, and then the motor 71 of the driving mechanism is started to rotate the cam 73, so as to drive the column 91 to move up and down in the outer tube 10, because the connecting body 92 is magnetically connected with the sliding ring 85, when the column 91 moves up and down, the moving table 84 also moves up and down along with the column 91, and because the moving table 84 is in threaded connection with the stirring shaft 81, when the moving table 84 moves up and down, the stirring shaft 81 drives the stirring paddle 82 to rotate forward and backward, so as to stir the materials in the reaction kettle 1. When cylinder 91 stretched into the deionized water, the deionized water will get into cylinder 91 through perforation 93 to make the mixture mix with the deionized water, because cylinder 91 upper end and cam 73 circumference face contact, consequently when cam 73 rotated, cylinder 91 will stretch into the deionized water once, stretch out from the deionized water once again, be convenient for control reaction go on, so that the material steadily reacts, prevents to react too violently.
Examples of the applications
The thixotropic agent A is used as an additive and is compatible with the commercial ultra-high performance concrete to prepare the novel ultra-high performance shotcrete, and the tables 1 to 2 are obtained.
TABLE 1 compression Strength of concrete with different amounts of thixotropic agent A (mpa)
TABLE 2 concrete flexural strength of thixotropic agent A at various blending amounts is as follows (mpa)
Example 2: compared with the embodiment 1, the thixotropic agent for the ultra-high performance sprayed concrete and the preparation method and the device thereof are characterized in that the thixotropic agent for the ultra-high performance sprayed concrete consists of the following components in parts by weight:
400g of aluminum sulfate; 12g of aluminum hydroxide gel; 35g of crystal nucleus early strength agent; 25g of triethanolamine; 60g of silicon phosphate; trimellitic anhydride 2 g; 4g of ethylene diamine tetraacetic acid disodium salt; 5g of sodium polyphosphate; 1g of cellulose ether; 520g of deionized water.
The preparation process was the same as in example 1, and finally a thixotropic agent B was prepared.
Examples of the applications
The thixotropic agent B was used as an admixture to prepare ultra-high performance shotcretes, to obtain tables 3-4.
TABLE 3 compression Strength of concrete with different amounts of thixotropic agent B as follows (mpa)
TABLE 4 concrete flexural strength of thixotropic agent B at various blending amounts is as follows (mpa)
Example 3: compared with the embodiment 1, the thixotropic agent for the ultra-high performance sprayed concrete and the preparation method and the device thereof are characterized in that the thixotropic agent for the ultra-high performance sprayed concrete consists of the following components in parts by weight:
500g of aluminum sulfate; 10g of aluminum hydroxide gel; 40g of crystal nucleus early strength agent; 25g of triethanolamine; 60g of silicon phosphate; 4g of trimellitic anhydride; 3g of ethylene diamine tetraacetic acid disodium salt; 6g of sodium polyphosphate; cellulose ether 1.5 g; 480g of deionized water.
The preparation was carried out in the same manner as in example 1, and finally a thixotropic agent C was obtained.
Examples of the applications
The thixotropic agent C was used as an admixture to prepare ultra-high performance shotcretes, to obtain tables 5-6.
TABLE 5 compression Strength of concrete with different amounts of thixotropic agent C as follows (mpa)
TABLE 6 concrete flexural strength of thixotropic agent C at various blending amounts is as follows (mpa)
According to the test method of the related items of GB 50107-2010 concrete strength test evaluation Standard, the thixotropic agent prepared in the embodiment 1-3 has obvious advantages, and when the mixing amount of the thixotropic agent is within the range of 3-5%, the setting time and strength of the sprayable ultrahigh-performance concrete can meet the requirements of GB/T35159-2017 accelerator for sprayed concrete on the thixotropic agent for liquid alkali-free ultrahigh-performance sprayed concrete and the preparation method thereof.
In order to fully understand the adaptability of the thixotropic agent prepared by the invention to UHPC (ultra high performance concrete), different particle size gradations are respectively carried out on the UHPC ultra high performance concrete, the detection of the setting time and the strength is carried out by referring to GB/T31387-2015 active powder concrete and JC/T568-2019 high performance concrete aggregate and adopting the thixotropic agent for the sprayable ultra high performance shotcrete prepared by the embodiments 1-3 and the preparation method thereof, and finally, the use requirements of GB 50728-2011 engineering structure reinforcing material safety performance identification technical specification are all met.
Example 4: compared with the embodiment 1, the thixotropic agent for the ultra-high performance sprayed concrete and the preparation method and the device thereof are characterized in that the thixotropic agent for the ultra-high performance sprayed concrete consists of the following components in parts by weight:
250g of aluminum sulfate; 5g of aluminum hydroxide gel; 10g of crystal nucleus early strength agent; 10g of triethanolamine; 30g of silicon phosphate; 0.5g of trimellitic anhydride; 1g of disodium ethylene diamine tetraacetate; 5g of sodium polyphosphate; 0.5g of cellulose ether; 250g of deionized water.
Example 5: compared with the embodiment 1, the thixotropic agent for the ultra-high performance sprayed concrete and the preparation method and the device thereof are characterized in that the thixotropic agent for the ultra-high performance sprayed concrete consists of the following components in parts by weight:
500g of aluminum sulfate; 15g of aluminum hydroxide gel; 30g of crystal nucleus early strength agent; 35g of triethanolamine; 90g of silicon phosphate; trimellitic anhydride 2 g; 10g of ethylene diamine tetraacetic acid disodium salt; 20g of sodium polyphosphate; 4g of cellulose ether; 500g of deionized water.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and all technical solutions that belong to the idea of the present invention belong to the scope of the present invention. It should be noted that several improvements and modifications without departing from the principle of the present invention will occur to those skilled in the art, and such improvements and modifications should also be construed as within the scope of the present invention.
Claims (10)
1. A thixotropic agent for ultra-high performance sprayed concrete is characterized in that: the composition comprises the following components in parts by weight:
250-500 parts of aluminum sulfate; 5-15 parts of aluminum hydroxide gel; 10-40 parts of a crystal nucleus early strength agent; 10-35 parts of triethanolamine; 30-90 parts of silicon phosphate; 0.5-4 parts of trimellitic anhydride; 1-10 parts of disodium ethylene diamine tetraacetate; 5-20 parts of sodium polyphosphate; 0.5-4 parts of cellulose ether; 250-520 parts of deionized water.
2. The thixotropic agent for ultra-high performance shotcrete as set forth in claim 1, wherein: the composition comprises the following components in parts by weight:
400 parts of aluminum sulfate; 12 parts of aluminum hydroxide gel; 35 parts of crystal nucleus early strength agent; 25 parts of triethanolamine; 60 parts of silicon phosphate; 2 parts of trimellitic anhydride; 4 parts of ethylene diamine tetraacetic acid disodium salt; 5 parts of sodium polyphosphate; 1 part of cellulose ether; 520 parts of deionized water.
3. The thixotropic agent for ultra-high performance shotcrete as set forth in claim 1, wherein: the aluminum sulfate is one or two of 18-water aluminum sulfate and polyaluminum sulfate which are optionally mixed.
4. The thixotropic agent for ultra-high performance shotcrete as set forth in claim 1, wherein: the crystal nucleus early strength agent is an organic/inorganic hybrid nano-micron scale cement hydration accelerator.
5. The thixotropic agent for ultra-high performance shotcrete as set forth in claim 1, wherein: the cellulose ether is one or a mixture of three of water-soluble high-molecular hydroxymethyl cellulose ether, hydroxyethyl cellulose ether and hydroxypropyl cellulose ether in any proportion.
6. A preparation method of a thixotropic agent for ultra-high performance sprayed concrete is characterized by comprising the following steps: the method comprises the following steps:
s1, weighing the components according to the weight parts of the raw materials of the thixotropic agent for the ultra-high performance shotcrete as claimed in any one of claims 1 to 5;
s2, putting deionized water into a preparation device, heating to 70-90 ℃, then cooling to 60 ℃, and keeping;
s3, mixing the weighed aluminum sulfate, silicon phosphate, sodium polyphosphate, trimellitic anhydride, ethylene diamine tetraacetic acid and cellulose ether to obtain a mixture; adding the mixture into the preparation device in the step S2, performing intermittent forward and backward stirring at the speed of 120-300 r/min, adding aluminum hydroxide gel after the solid is completely dissolved, continuously stirring at the speed of 80-150 r/min for 15min, and cooling to normal temperature;
s4, adding triethanolamine and the crystal nucleus early strength agent at normal temperature, continuously stirring for 20min at the speed of 80-150 r/min, and filling to obtain the finished product.
7. The method for preparing the thixotropic agent for the ultra-high performance shotcrete as claimed in claim 6, wherein the thixotropic agent comprises: in the adding process of the mixture, firstly pouring the mixture into a feeding column (9) of the preparation device, and then starting a driving mechanism on the preparation device to drive the feeding column (9) to move up and down so as to enable the mixture to be in intermittent contact with the deionization; and in the up-and-down moving process of the feeding column (9), the stirring mechanism on the preparation device can stir the deionized water in forward and reverse directions.
8. A manufacturing apparatus of the thixotropic agent for ultra-high performance shotcrete as set forth in any one of claims 6 and 7, wherein: comprises a reaction kettle (1), a jacket (2), a driving mechanism, a stirring mechanism, a feeding column (9) and an outer tube (10);
the jacket (2) is coated on the periphery of the surface of the reaction kettle (1), a heat exchange medium inlet (4) and a heat exchange medium outlet (3) are arranged on the jacket (2), a feed inlet (5) is formed in the top of the reaction kettle (1), a discharge outlet (6) is formed in the bottom of the reaction kettle (1), the outer pipe (10) is positioned in the reaction kettle (1), the upper end of the outer pipe is fixed to the top of the reaction kettle (1), the feed column (9) comprises a column body (91) and a perforation (93), the column body (91) is arranged in a hollow mode and is inserted into the outer pipe (10), a discharge port (12) is formed in the upper portion of the column body (91), a porous layer (94) is arranged on the lower portion of the column body (91), and the porous layer (94) is arranged on the periphery surface of the column body (91);
the driving mechanism is positioned above the reaction kettle (1) and is used for driving the column body (91) to move up and down in the outer pipe (10) so that the column body (91) extends out of the lower end of the outer pipe (10) and downwards extends into deionized water, and the through holes (93) are positioned on the periphery of the lower part of the column body (91);
the stirring mechanism is located in the reaction kettle (1), and in the up-and-down moving process of the column body (91), the stirring mechanism is used for stirring materials in the reaction kettle (1).
9. The apparatus of claim 8, wherein the thixotropic agent comprises: the driving mechanism comprises a motor (71), a main shaft (72), a cam (73) and a supporting frame (74);
the support frame (74) is fixed above the top of the reaction kettle (1), the motor (71) is installed on the support frame (74), one end of the main shaft (72) is fixed with an output shaft of the motor (71), the other end of the main shaft penetrates through the cam (73) and is fixedly connected with the cam (73), the cam (73) is positioned above the column body (91), and the upper end of the column body (91) is arranged in a round angle mode and is in contact with the circumferential surface of the cam (73);
reation kettle (1) top is provided with spring (14) and roof (13), spring (14) lower extreme is fixed reation kettle (1) top, the upper end is fixed on roof (13), roof (13) are located the relative both sides of cylinder (91) and with cylinder (91) upper portion one side fixed connection.
10. The apparatus of claim 9, wherein the thixotropic agent comprises: the stirring mechanism comprises a stirring shaft (81), a stirring paddle (82), a mobile platform (84) and a sliding ring (85);
the stirring shaft (81) is vertically arranged and is positioned between the outer pipe (10) and the inner wall of the reaction kettle (1), the upper end of the stirring shaft (81) is inserted into the inner top of the reaction kettle (1), the lower end of the stirring shaft is inserted into the inner bottom of the reaction kettle (1), the stirring paddle (82) is fixed on the surface of the stirring shaft (81) and is used for stirring materials in the reaction kettle (1), an external thread (83) is arranged on the upper part of the stirring shaft (81), the stirring shaft (81) penetrates through the moving platform (84), and the moving platform (84) is in threaded fit with the external thread (83) on the stirring shaft (81);
the mobile station (84) is fixedly connected with the sliding ring (85), the sliding ring (85) is sleeved on the outer surface of the outer tube (10), a connecting body (92) is arranged on the circumferential surface of the cylinder (91), the connecting body (92) is in contact with the inner wall of the outer tube (10), and the connecting body (92) is magnetically connected with the sliding ring (85).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116589256A (en) * | 2023-06-01 | 2023-08-15 | 安徽建筑大学 | Ultra-high performance concrete spray material for facing and processing equipment thereof |
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