CN111960709A - Early strength agent and application thereof in concrete material - Google Patents
Early strength agent and application thereof in concrete material Download PDFInfo
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- CN111960709A CN111960709A CN202010905069.4A CN202010905069A CN111960709A CN 111960709 A CN111960709 A CN 111960709A CN 202010905069 A CN202010905069 A CN 202010905069A CN 111960709 A CN111960709 A CN 111960709A
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
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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
- C04B2103/10—Accelerators; Activators
- C04B2103/14—Hardening accelerators
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- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
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Abstract
The invention discloses an early strength agent and application thereof in concrete materials, wherein the early strength agent comprises the following components in parts by weight: 30-50 parts of magnesium fluosilicate, 14-20 parts of lithium sulfate, 15-25 parts of sodium nitrite and 55-75 parts of pre-hydrated cement particles. The preparation method of the pre-hydrated cement particles comprises the following steps: according to the weight parts, 80-120 parts of cement and 20-40 parts of water are uniformly stirred, and are maintained for 28-30 days after granulation, then are subjected to ball milling, and are sieved by a 200-300-mesh sieve, so that pre-hydrated cement particles are obtained. The invention can obviously improve the performance of the early strength agent and accelerate the hardening time by self-making the pre-hydrated cement particles and combining with other components, has obvious effect of enhancing the later strength of the cement base material, does not shrink, and meets the requirements of the service strength and the durability of the concrete.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to an early strength agent and application thereof in concrete materials.
Background
With the development of urban infrastructure construction, the construction of engineering projects such as prefabricated houses, urban subway tunnels and the like is developed vigorously, and the projects with fast construction progress have higher requirements on the strength of the concrete prefabricated parts. Therefore, how to improve the early strength of the concrete prefabricated parts is a key technology.
The early strength agent is one of the additives of concrete and concrete-based materials, and refers to an additive which can improve the early strength of concrete and concrete-based material products and has no obvious influence on the later strength. The action mechanism is that the cement cementing component is provided by accelerating the hydration speed of the cement, thereby promoting the early strength of the cement and products, and the cement and products have the early strength function and certain water reducing and enhancing functions. So far, various early strength additives except chloride and sulfate, such as nitrite and chromate, and organic early strength agents, such as triethanolamine, calcium formate, urea and the like, have been developed in sequence in the prior art, but most of the early strength additives have the problems of complex preparation process, high cost, poor environmental adaptability and the like, and meanwhile, the cement early strength agents in the prior art have the problems of small early strength improvement range, slow hardening time and no consideration for later strength.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
To achieve these objects and other advantages in accordance with the present invention, there is provided an early strength agent comprising the following components in parts by weight:
30-50 parts of magnesium fluosilicate, 14-20 parts of lithium sulfate, 15-25 parts of sodium nitrite and 55-75 parts of pre-hydrated cement particles.
Preferably, the food also comprises the following components in parts by weight: 5-10 parts of sodium acetate, 3-5 parts of calcium stearate, 5-10 parts of nano silicon dioxide, 1-3 parts of cellulose ether and 2-4 parts of sepiolite powder.
Preferably, the composition comprises the following components in parts by weight: 40 parts of magnesium fluosilicate, 16 parts of lithium sulfate, 20 parts of sodium sulfate, 20 parts of calcium nitrite and 60 parts of prehydrated cement particles.
Preferably, the composition comprises the following components in parts by weight: 40 parts of magnesium fluosilicate, 16 parts of lithium sulfate, 20 parts of sodium sulfate, 20 parts of calcium nitrite, 60 parts of pre-hydrated cement particles, 6 parts of sodium acetate, 4 parts of calcium stearate, 8 parts of nano silicon dioxide, 2 parts of cellulose ether and 3 parts of sepiolite powder.
Preferably, the sepiolite powder is calcined at high temperature before use, and the process is as follows: calcining the sepiolite powder in a nitrogen atmosphere at the calcining temperature of 400-600 ℃ for 3-6 h at the heating rate of 1-3 ℃/min.
Preferably, the preparation method of the pre-hydrated cement particles comprises the following steps: according to the weight parts, 80-120 parts of cement and 20-40 parts of water are uniformly stirred, and are maintained for 28-30 days after granulation, then are subjected to ball milling, and are sieved by a 200-300-mesh sieve, so that pre-hydrated cement particles are obtained.
Preferably, the preparation method of the pre-hydrated cement particles comprises the following steps: according to the weight parts, 80-120 parts of cement, 20-40 parts of water, 6-8 parts of modified nano titanium dioxide and 1-3 parts of polyethylene glycol are uniformly stirred, and are cured for 28-30 days after granulation, then are subjected to ball milling, and are sieved by a 200-300-mesh sieve, so that pre-hydrated cement particles are obtained.
Preferably, the preparation method of the modified nano titanium dioxide comprises the following steps: adding 100 parts by weight of nano titanium dioxide and 1-2 parts by weight of sodium N-lauroyl glutamate into 260-350 parts by weight of absolute ethyl alcohol, and stirring at 200-400 r/min for 30-45 min to obtain a nano titanium dioxide dispersion liquid; adding 3-5 parts of tetrahydroxyethyl diamine, 1-3 parts of diethanol monoisopropanol and 1.5-3.5 parts of polyvinylpyrrolidone into the nano titanium dioxide dispersion liquid, sealing, pressurizing and ultrasonically treating, filtering, drying, crushing and sieving to obtain modified nano titanium dioxide; the particle size of the nano titanium dioxide is 40-80 nm; the technological parameters of the sealing pressure ultrasound are as follows: stopping ultrasound for 10-12 min after every 5-10 min of ultrasound, wherein the total time of ultrasound is 3-5 h, the pressure is 12-15 MPa, the temperature is 40-60 ℃, and the frequency is 1-3 MHz.
Preferably, the nano-silica is pretreated before use, and the pretreatment process comprises the following steps: adding 100 parts by weight of nano silicon dioxide and 1.5-2.5 parts by weight of alpha-sodium alkenyl sulfonate into 280-360 parts by weight of absolute ethyl alcohol, and stirring for 30-45 min at the speed of 150-350 r/min to obtain nano silicon dioxide dispersion liquid; adding 4-6 parts of tetrahydroxyethyl diamine, 1-2 parts of triisopropanolamine and 2-5 parts of polyacrylic acid into the nano silicon dioxide dispersion liquid, sealing, pressurizing and ultrasonically treating, filtering, drying, crushing and sieving to obtain modified nano silicon dioxide; the particle size of the nano silicon dioxide is 50-100 nm; the technological parameters of the sealing pressure ultrasound are as follows: stopping the ultrasonic treatment for 8-10 min after every 10-15 min of ultrasonic treatment, wherein the total time of ultrasonic treatment is 3-5 h, the pressure is 12-15 MPa, the temperature is 40-60 ℃, and the frequency is 1-3 MHz.
The invention also provides an application of the early strength agent in concrete materials, wherein the concrete materials comprise cement; the dosage of the early strength agent is 2-5 wt% of the dosage of the cement.
The invention at least comprises the following beneficial effects: the invention can obviously improve the performance of the early strength agent and accelerate the hardening time by self-making the pre-hydrated cement particles and combining with other components, has obvious effect of enhancing the later strength of the cement base material, does not shrink, and meets the requirements of the service strength and the durability of the concrete.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
The specific implementation mode is as follows:
the present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1:
an early strength agent comprises the following components:
30kg of magnesium fluosilicate, 14kg of lithium sulfate, 15kg of sodium nitrite and 55kg of prehydrated cement particles;
the preparation method of the pre-hydrated cement particles comprises the following steps: and uniformly stirring 80kg of cement and 20kg of water, granulating, maintaining for 28 days, ball-milling, and sieving by a 200-mesh sieve to obtain the prehydrated cement particles.
Example 2:
an early strength agent comprises the following components:
50kg of magnesium fluosilicate, 20kg of lithium sulfate, 25kg of sodium nitrite and 75kg of prehydrated cement particles;
the preparation method of the pre-hydrated cement particles comprises the following steps: and uniformly stirring 120kg of cement and 40kg of water, granulating, maintaining for 30 days, ball-milling, and sieving by a 300-mesh sieve to obtain the prehydrated cement particles.
Example 3:
an early strength agent comprises the following components:
40kg of magnesium fluosilicate, 16kg of lithium sulfate, 20kg of sodium nitrite and 60kg of prehydrated cement particles;
the preparation method of the pre-hydrated cement particles comprises the following steps: 100kg of cement and 30kg of water are uniformly stirred, and are maintained for 28 days after granulation, and then are ball-milled and sieved by a 300-mesh sieve, so that prehydrated cement particles are obtained.
Example 4:
an early strength agent comprises the following components:
40kg of magnesium fluosilicate, 16kg of lithium sulfate, 20kg of sodium nitrite and 60kg of prehydrated cement particles; 6kg of sodium acetate, 4kg of calcium stearate, 8kg of nano silicon dioxide, 2kg of cellulose ether and 3kg of sepiolite powder; the sepiolite powder is calcined at high temperature before use, and the process comprises the following steps: calcining sepiolite powder in nitrogen atmosphere at 500 deg.C for 5 hr at a heating rate of 2 deg.C/min; the compressive strength of the early strength agent can be obviously improved by adding nano silicon dioxide, sepiolite powder and the like;
the preparation method of the pre-hydrated cement particles comprises the following steps: 100kg of cement and 30kg of water are uniformly stirred, and are maintained for 28 days after granulation, and then are ball-milled and sieved by a 300-mesh sieve, so that prehydrated cement particles are obtained.
Example 5:
an early strength agent comprises the following components:
40kg of magnesium fluosilicate, 16kg of lithium sulfate, 20kg of sodium nitrite and 60kg of prehydrated cement particles;
the preparation method of the pre-hydrated cement particles comprises the following steps: uniformly stirring 100kg of cement, 30kg of water, 7kg of modified nano titanium dioxide and 2kg of polyethylene glycol, performing maintenance for 28 days after granulation, then performing ball milling, and sieving by using a 300-mesh sieve to obtain pre-hydrated cement particles;
the preparation method of the modified nano titanium dioxide comprises the following steps: adding 1kg of nano titanium dioxide and 0.02kg of N-lauroyl sodium glutamate into 3.2kg of absolute ethyl alcohol, and stirring for 45min at the speed of 300r/min to obtain nano titanium dioxide dispersion liquid; adding 0.04kg of tetrahydroxyethyl diamine, 2kg of diethanol monoisopropanol and 2.5kg of polyvinylpyrrolidone into the nano titanium dioxide dispersion liquid, sealing, pressurizing and ultrasonically treating, filtering, drying, crushing and sieving to obtain modified nano titanium dioxide; the particle size of the nano titanium dioxide is 50 nm; the technological parameters of the sealing pressure ultrasound are as follows: stopping ultrasound for 10min after every 10min of ultrasound, wherein the total time of ultrasound is 4h, the pressure is 15MPa, the temperature is 50 ℃, and the frequency is 2 MHz; the modified nano titanium dioxide prepared by the method has excellent dispersibility and stability, and adopts a pressurized ultrasonic mode, ultrasonic waves can break dispersed and aggregated nano particles, and ultrasonic waves can generate cavitation so that liquid is in a high-frequency oscillation state; the nano titanium dioxide particles can be in a good dispersion state by utilizing the action of ultrasonic waves, the agglomeration phenomenon among the nano titanium dioxide particles is reduced, and the mixing and reaction of reactants in a micro scale can be accelerated; further, the obtained early strength agent has excellent performance.
Example 6:
an early strength agent comprises the following components:
40kg of magnesium fluosilicate, 16kg of lithium sulfate, 20kg of sodium nitrite and 60kg of prehydrated cement particles; 6kg of sodium acetate, 4kg of calcium stearate, 8kg of nano silicon dioxide, 2kg of cellulose ether and 3kg of sepiolite powder; the sepiolite powder is calcined at high temperature before use, and the process comprises the following steps: calcining sepiolite powder in nitrogen atmosphere at 500 deg.C for 5 hr at a heating rate of 2 deg.C/min;
the preparation method of the pre-hydrated cement particles comprises the following steps: uniformly stirring 100kg of cement, 30kg of water, 7kg of modified nano titanium dioxide and 2kg of polyethylene glycol, performing maintenance for 28 days after granulation, then performing ball milling, and sieving by using a 300-mesh sieve to obtain pre-hydrated cement particles;
the preparation method of the modified nano titanium dioxide comprises the following steps: adding 1kg of nano titanium dioxide and 0.02kg of N-lauroyl sodium glutamate into 3.2kg of absolute ethyl alcohol, and stirring for 45min at the speed of 300r/min to obtain nano titanium dioxide dispersion liquid; adding 0.04kg of tetrahydroxyethyl diamine, 2kg of diethanol monoisopropanol and 2.5kg of polyvinylpyrrolidone into the nano titanium dioxide dispersion liquid, sealing, pressurizing and ultrasonically treating, filtering, drying, crushing and sieving to obtain modified nano titanium dioxide; the particle size of the nano titanium dioxide is 50 nm; the technological parameters of the sealing pressure ultrasound are as follows: stopping ultrasound for 10min after every 10min of ultrasound, wherein the total time of ultrasound is 4h, the pressure is 15MPa, the temperature is 50 ℃, and the frequency is 2 MHz;
example 7:
an early strength agent comprises the following components:
40kg of magnesium fluosilicate, 16kg of lithium sulfate, 20kg of sodium nitrite and 60kg of prehydrated cement particles; 6kg of sodium acetate, 4kg of calcium stearate, 8kg of modified nano silicon dioxide, 2kg of cellulose ether and 3kg of sepiolite powder; the sepiolite powder is calcined at high temperature before use, and the process comprises the following steps: calcining sepiolite powder in nitrogen atmosphere at 500 deg.C for 5 hr at a heating rate of 2 deg.C/min;
the preparation method of the pre-hydrated cement particles comprises the following steps: uniformly stirring 100kg of cement and 30kg of water, granulating, maintaining for 28 days, then ball-milling, and sieving by a 300-mesh sieve to obtain pre-hydrated cement particles;
the nanometer silicon dioxide is pretreated before use, and the pretreatment process comprises the following steps: adding 1kg of nano silicon dioxide and 0.015kg of alpha-sodium alkenyl sulfonate into 3kg of absolute ethyl alcohol, and stirring for 30min at the speed of 300r/min to obtain nano silicon dioxide dispersion liquid; adding 0.04kg of tetrahydroxyethyl diamine, 0.01kg of triisopropanolamine and 0.02kg of polyacrylic acid into the nano silicon dioxide dispersion liquid, sealing, pressurizing and ultrasonically treating, and then filtering, drying, crushing and sieving to obtain modified nano silicon dioxide; the particle size of the nano silicon dioxide is 60 nm; the technological parameters of the sealing pressure ultrasound are as follows: stopping ultrasound for 10min after every 15min of ultrasound, wherein the total time of ultrasound is 5h, the pressure is 12MPa, the temperature is 60 ℃, and the frequency is 2 MHz; the modified nano-silica obtained by pretreating the nano-silica by the method has excellent dispersibility and stability, and the ultrasonic mode is adopted, so that dispersed and aggregated nano-particles can be broken by ultrasonic waves, and the ultrasonic waves can generate cavitation to enable the liquid to be in a high-frequency oscillation state; the nano silicon dioxide particles can be in a good dispersion state by utilizing the action of ultrasonic waves, the agglomeration phenomenon among the nano silicon dioxide particles is reduced, and the mixing and reaction of reactants in a micro scale can be accelerated; further, the obtained early strength agent has excellent performance.
Example 8:
an early strength agent comprises the following components:
40kg of magnesium fluosilicate, 16kg of lithium sulfate, 20kg of sodium nitrite and 60kg of prehydrated cement particles; 6kg of sodium acetate, 4kg of calcium stearate, 8kg of modified nano silicon dioxide, 2kg of cellulose ether and 3kg of sepiolite powder; the sepiolite powder is calcined at high temperature before use, and the process comprises the following steps: calcining sepiolite powder in nitrogen atmosphere at 500 deg.C for 5 hr at a heating rate of 2 deg.C/min;
the preparation method of the pre-hydrated cement particles comprises the following steps: uniformly stirring 100kg of cement, 30kg of water, 7kg of modified nano titanium dioxide and 2kg of polyethylene glycol, performing maintenance for 28 days after granulation, then performing ball milling, and sieving by using a 300-mesh sieve to obtain pre-hydrated cement particles;
the preparation method of the modified nano titanium dioxide comprises the following steps: adding 1kg of nano titanium dioxide and 0.02kg of N-lauroyl sodium glutamate into 3.2kg of absolute ethyl alcohol, and stirring for 45min at the speed of 300r/min to obtain nano titanium dioxide dispersion liquid; adding 0.04kg of tetrahydroxyethyl diamine, 2kg of diethanol monoisopropanol and 2.5kg of polyvinylpyrrolidone into the nano titanium dioxide dispersion liquid, sealing, pressurizing and ultrasonically treating, filtering, drying, crushing and sieving to obtain modified nano titanium dioxide; the particle size of the nano titanium dioxide is 50 nm; the technological parameters of the sealing pressure ultrasound are as follows: stopping ultrasound for 10min after every 10min of ultrasound, wherein the total time of ultrasound is 4h, the pressure is 15MPa, the temperature is 50 ℃, and the frequency is 2 MHz;
the nanometer silicon dioxide is pretreated before use, and the pretreatment process comprises the following steps: adding 1kg of nano silicon dioxide and 0.015kg of alpha-sodium alkenyl sulfonate into 3kg of absolute ethyl alcohol, and stirring for 30min at the speed of 300r/min to obtain nano silicon dioxide dispersion liquid; adding 0.04kg of tetrahydroxyethyl diamine, 0.01kg of triisopropanolamine and 0.02kg of polyacrylic acid into the nano silicon dioxide dispersion liquid, sealing, pressurizing and ultrasonically treating, and then filtering, drying, crushing and sieving to obtain modified nano silicon dioxide; the particle size of the nano silicon dioxide is 60 nm; the technological parameters of the sealing pressure ultrasound are as follows: stopping ultrasound for 10min after every 15min of ultrasound, wherein the total time of ultrasound is 5h, the pressure is 12MPa, the temperature is 60 ℃, and the frequency is 2 MHz.
Performing performance tests on the early strength agents prepared in the embodiments 1 to 8, respectively stirring and mixing the components of the early strength agents in the embodiments 1 to 8 uniformly, then adding the mixture into the following concrete, and performing related performance tests according to the GB8076-2008 standard, wherein the results are shown in Table 1; wherein, the concrete comprises the following components in parts by weight: cement: 282 parts of; sand: 475 parts; 10-20mm stone: 422 parts of (1); 5-10mm stone: 264 parts of (A); water: 85 parts of a mixture; the addition amount of the early strength agent is 3.5 wt% of the cement amount; wherein, the compressive strength ratio of 252% for 1d, 205% for 3d, 182% for 7d and 168% for 28d was calculated after the concrete was added to the early strength agent prepared in example 3.
TABLE 1
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the examples shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (10)
1. The early strength agent is characterized by comprising the following components in parts by weight:
30-50 parts of magnesium fluosilicate, 14-20 parts of lithium sulfate, 15-25 parts of sodium nitrite and 55-75 parts of pre-hydrated cement particles.
2. The early strength agent as claimed in claim 1, further comprising the following components in parts by weight: 5-10 parts of sodium acetate, 3-5 parts of calcium stearate, 5-10 parts of nano silicon dioxide, 1-3 parts of cellulose ether and 2-4 parts of sepiolite powder.
3. The early strength agent as claimed in claim 1, which comprises the following components in parts by weight: 40 parts of magnesium fluosilicate, 16 parts of lithium sulfate, 20 parts of sodium sulfate, 20 parts of calcium nitrite and 60 parts of prehydrated cement particles.
4. The early strength agent as claimed in claim 2, which comprises the following components in parts by weight: 40 parts of magnesium fluosilicate, 16 parts of lithium sulfate, 20 parts of sodium sulfate, 20 parts of calcium nitrite, 60 parts of pre-hydrated cement particles, 6 parts of sodium acetate, 4 parts of calcium stearate, 8 parts of nano silicon dioxide, 2 parts of cellulose ether and 3 parts of sepiolite powder.
5. The early strength agent according to claim 2, wherein the sepiolite powder is calcined at a high temperature before use by the process of: calcining the sepiolite powder in a nitrogen atmosphere at the calcining temperature of 400-600 ℃ for 3-6 h at the heating rate of 1-3 ℃/min.
6. The early strength agent according to claim 1, wherein the pre-hydrated cement particles are prepared by a method comprising: according to the weight parts, 80-120 parts of cement and 20-40 parts of water are uniformly stirred, and are maintained for 28-30 days after granulation, then are subjected to ball milling, and are sieved by a 200-300-mesh sieve, so that pre-hydrated cement particles are obtained.
7. The early strength agent according to claim 1, wherein the pre-hydrated cement particles are prepared by a method comprising: according to the weight parts, 80-120 parts of cement, 20-40 parts of water, 6-8 parts of modified nano titanium dioxide and 1-3 parts of polyethylene glycol are uniformly stirred, and are cured for 28-30 days after granulation, then are subjected to ball milling, and are sieved by a 200-300-mesh sieve, so that pre-hydrated cement particles are obtained.
8. The early strength agent as claimed in claim 6, wherein the preparation method of the modified nano titanium dioxide comprises the following steps: adding 100 parts by weight of nano titanium dioxide and 1-2 parts by weight of sodium N-lauroyl glutamate into 260-350 parts by weight of absolute ethyl alcohol, and stirring at 200-400 r/min for 30-45 min to obtain a nano titanium dioxide dispersion liquid; adding 3-5 parts of tetrahydroxyethyl diamine, 1-3 parts of diethanol monoisopropanol and 1.5-3.5 parts of polyvinylpyrrolidone into the nano titanium dioxide dispersion liquid, sealing, pressurizing and ultrasonically treating, filtering, drying, crushing and sieving to obtain modified nano titanium dioxide; the particle size of the nano titanium dioxide is 40-80 nm; the technological parameters of the sealing pressure ultrasound are as follows: stopping ultrasound for 10-12 min after every 5-10 min of ultrasound, wherein the total time of ultrasound is 3-5 h, the pressure is 12-15 MPa, the temperature is 40-60 ℃, and the frequency is 1-3 MHz.
9. The early strength agent according to claim 2, wherein the nano-silica is pretreated before use by the following pretreatment processes: adding 100 parts by weight of nano silicon dioxide and 1.5-2.5 parts by weight of alpha-sodium alkenyl sulfonate into 280-360 parts by weight of absolute ethyl alcohol, and stirring for 30-45 min at the speed of 150-350 r/min to obtain nano silicon dioxide dispersion liquid; adding 4-6 parts of tetrahydroxyethyl diamine, 1-2 parts of triisopropanolamine and 2-5 parts of polyacrylic acid into the nano silicon dioxide dispersion liquid, sealing, pressurizing and ultrasonically treating, filtering, drying, crushing and sieving to obtain modified nano silicon dioxide; the particle size of the nano silicon dioxide is 50-100 nm; the technological parameters of the sealing pressure ultrasound are as follows: stopping the ultrasonic treatment for 8-10 min after every 10-15 min of ultrasonic treatment, wherein the total time of ultrasonic treatment is 3-5 h, the pressure is 12-15 MPa, the temperature is 40-60 ℃, and the frequency is 1-3 MHz.
10. Use of an early strength agent as defined in any of claims 1 to 9 in a concrete material, wherein the concrete material comprises cement; the dosage of the early strength agent is 2-5 wt% of the dosage of the cement.
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| EP4194419A1 (en) * | 2021-12-08 | 2023-06-14 | Holcim Technology Ltd | Method for increasing the strength of a hydraulic binder and a mineral accelerator therefore |
| WO2023104605A1 (en) * | 2021-12-08 | 2023-06-15 | Holcim Technology Ltd | Method for increasing the strength of a hydraulic binder and a mineral accelerator therefore |
| CN114288192A (en) * | 2022-02-14 | 2022-04-08 | 浙江搏谷医疗科技有限公司 | Composition paste for tooth sealing treatment, preparation method and application |
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