CN113735480A - Aluminate cement-based powder accelerator and preparation method and application thereof - Google Patents
Aluminate cement-based powder accelerator and preparation method and application thereof Download PDFInfo
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- CN113735480A CN113735480A CN202111045312.0A CN202111045312A CN113735480A CN 113735480 A CN113735480 A CN 113735480A CN 202111045312 A CN202111045312 A CN 202111045312A CN 113735480 A CN113735480 A CN 113735480A
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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
- C04B40/0042—Powdery mixtures
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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
- 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
- C04B28/08—Slag cements
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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
- C04B2103/12—Set accelerators
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of building material additives, and particularly relates to an aluminate cement-based powder accelerator as well as a preparation method and application thereof. The aluminate cement-based powder accelerator comprises aluminate cement, sodium carbonate, aluminum sulfate, sodium sulfate and hydrated lime; the powder accelerator comprises the following components in parts by weight: aluminate cement: sodium carbonate: aluminum sulfate: sodium sulfate: slaked lime (40-60): (10-20): (10-20): (10-20): (5-20). The aluminate cement-based powder accelerator has the characteristics of good accelerating effect, small 28d compressive strength loss, low cost and the like. The invention has low requirements on production equipment and personnel, short production period and low production cost, does not generate three wastes in the whole process, and does not influence the environment.
Description
Technical Field
The invention belongs to the technical field of building material additives, and particularly relates to an aluminate cement-based powder accelerator as well as a preparation method and application thereof.
Background
The sprayed concrete is usually used for rapid reinforcement or repair in engineering, and the accelerator is an indispensable additive for the sprayed concrete, and not only determines whether the concrete can realize rapid solidification, but also has great influence on the later performance of the concrete. At present, the alkali accelerator can be divided into an alkali accelerator and an alkali-free accelerator according to the content of alkali; according to the components of the accelerating agent, the accelerating agent can be divided into an inorganic accelerating agent and an organic accelerating agent; depending on the state of the accelerator, the accelerator can be classified into a powder accelerator and a liquid accelerator. The alkali-free accelerator is the most popular, but because the accelerating effect of the alkali-free accelerator is not obvious, a large mixing amount is needed during use, the raw material cost is relatively high during production, and the use cost is often difficult to accept due to the large mixing amount; the alkali accelerating agent has the characteristics of good accelerating effect, small mixing amount, low cost and the like, but usually has the defects of large later strength loss, namely small 28d compressive strength and the like.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide an aluminate cement-based powder accelerator and a preparation method and application thereof, and aims to solve the problems that the conventional accelerator cannot meet the requirement on the accelerating effect, has high 28d compressive strength loss, high cost and the like.
In order to achieve the purpose, the invention provides the following technical scheme:
an aluminate cement-based powder accelerator comprises aluminate cement, sodium carbonate, aluminum sulfate, sodium sulfate and hydrated lime; the powder accelerator comprises the following components in parts by weight: aluminate cement: sodium carbonate: aluminum sulfate: sodium sulfate: slaked lime (40-60): (10-20): (10-20): (10-20): (5-20).
Preferably, the aluminate cement is the aluminate cement meeting the requirements in the national standard GB/T201-2015 Table 1.
Preferably, the sodium carbonate is industrial soda ash meeting the requirements of class II first-class products and/or qualified products in the national standard of industrial sodium carbonate GB 210-1992.
Preferably, the aluminum sulfate is solid powder particles of aluminum sulfate I or II in chemical industry Standard "Industrial aluminum sulfate" HG/T2225-2010.
Preferably, the sodium sulfate is anhydrous sodium sulfate solid powder particles in Table 1 in accordance with chemical industry standard cosmetic sodium sulfate HG/T4535-2013.
Preferably, the particle sizes of the aluminum sulfate and the sodium sulfate are not less than 200 meshes.
Preferably, the hydrated lime is slaked lime powder meeting the first-class and/or qualified product requirements of calcium slaked lime powder in building material industry standard JC/T481-92.
The invention also provides a preparation method of the aluminate cement-based powder accelerator, which comprises the following steps: grinding and uniformly mixing the components according to the weight ratio to obtain the composition; the specific surface area of the aluminate cement-based powder accelerator is 300-500 m2/kg。
The invention also provides the application of the aluminate cement-based powder accelerator in cement.
Preferably, the cement is any one of portland cement, ordinary portland cement, composite portland cement, fly ash portland cement and slag portland cement in accordance with national standard "general portland cement" GB175-2020 table 1, table 2 and table 3.
Has the advantages that:
the aluminate cement-based powder accelerator has the characteristics of good accelerating effect, small 28d compressive strength loss, low cost and the like. When the aluminate cement-based powder accelerator is used for spraying concrete, the initial setting time is adjustable within 3-7 min, and the final setting time is adjustable within 5-12 min; the 1d compressive strength is high and is adjustable between 7 and 11 MPa; the 28d compressive strength loss is small, and the applicability with various Portland cement is good. The invention has low requirements on production equipment and personnel, short production period and low production cost, does not generate three wastes in the whole process, and does not influence the environment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a flow chart of the preparation of an aluminate cement-based powder accelerator in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention develops the high-quality high-efficiency aluminate cement-based accelerator by taking calcium aluminate cement as a main material and other chemical raw materials as auxiliary materials. The aluminate cement-based powder accelerator has good accelerating effect, the initial setting time can be as short as 2min, and the final setting time can be as short as 5 min; the mechanical property is good, the 1d compressive strength can reach more than 10MPa, and the 28d compressive strength ratio (the percentage of the 28d compressive strength of the mortar doped with the accelerating agent to the 28d compressive strength of the mortar not doped with the accelerating agent, particularly the national standard JC 477-2005) can reach more than 90 percent; the cement has good matching with different types of cement, and has good applicability to Portland cement, common Portland cement and fly ash Portland cement (the specific difference of the Portland cement and the fly ash Portland cement is shown in tables 1, 2 and 3 in national standard GB 175-2020) within the range of the doping amount of 4-8% (the doping amount is the ratio of the mass of the powder accelerator to the mass of the cement). The invention has low requirements on production equipment and personnel, short production period and low production cost, does not generate three wastes in the whole process, and does not influence the environment.
The aluminate cement-based powder accelerator comprises aluminate cement, sodium carbonate, aluminum sulfate, sodium sulfate and hydrated lime; the powder accelerator comprises the following components in parts by weight: aluminate cement: sodium carbonate: aluminum sulfate: sodium sulfate: slaked lime (40-60): (10-20): (10-20): (10-20): (5-20), for example, the weight ratio is 40: 10: 20: 10: 20. 60: 20: 10: 20: 5. 50: 15: 15: 15: 15. 45, and (2) 45: 10: 10: 10: 10. 55: 12: 18: 12: 10.
further, the aluminate cement is the aluminate cement which meets the requirements in the national standard GB/T201-2015 table 1.
Further, the sodium carbonate is industrial soda ash meeting the requirements of class II first-class products and/or qualified products in the national standard of industrial sodium carbonate GB 210-1992.
Further, the aluminum sulfate is solid powder particles of class I or class II aluminum sulfate in the chemical industry standard of industrial aluminum sulfate HG/T2225-Bush 2010, and the particle size is not less than 200 meshes.
Further, the sodium sulfate is anhydrous sodium sulfate solid powder particles in Table 1 which meet the chemical industry standard of cosmetic sodium sulfate HG/T4535-2013, and the particle size is not less than 200 meshes.
Furthermore, the slaked lime is slaked lime powder meeting the first-class and/or qualified product requirements of calcium slaked lime powder in JC/T481-92 of building material industry standard.
The specific surface area of the aluminate cement-based powder accelerator is 300-500 m2Kg (e.g. 300 m)2/kg、350m2/kg、380m2/kg、400m2/kg、420m2/kg、450m2/kg、500m2/kg)。
The preparation method of the aluminate cement-based powder accelerator disclosed by the invention comprises the following steps of: the aluminate cement, sodium carbonate, aluminum sulfate, sodium sulfate and hydrated lime are added into a mixer according to the weight ratio and are uniformly mixed, the inspection is carried out according to the building material industry standard accelerator for sprayed concrete (JC 477-.
The aluminate cement-based powder accelerator provided by the invention comprises: (1) the quick setting effect is good, the initial setting time is adjustable within 3-7 min, and the final setting time is adjustable within 5-12 min; (2) the 1d compressive strength is high and is adjustable between 7 and 11 MPa; (3) the 28d compressive strength loss is small; (4) good applicability to different cements, etc.
The invention has low requirements on production equipment and personnel, short production period and low production cost, does not generate three wastes in the whole process, and does not influence the environment.
In the following examples:
the aluminate cement is CA60 type aluminate cement which meets the requirements in the national standard of aluminate cement GB/T201-2015 table 1;
the sodium carbonate is industrial sodium carbonate meeting the requirements of class II first-class products in national standard 'industrial sodium carbonate' GB 210-1992;
the aluminum sulfate is solid powder particles of class I aluminum sulfate in the chemical industry standard of industrial aluminum sulfate HG/T2225-2010, and the particle size is 200 meshes;
the sodium sulfate is anhydrous sodium sulfate solid powder particles in Table 1 which accord with the chemical industry standard of cosmetic sodium sulfate HG/T4535-2013, and the particle size is 200 meshes;
the slaked lime is lime hydrate powder which meets the first-class requirements of calcium lime hydrate powder in JC/T481-92 of building material industry standard.
Example 1
The preparation method of the aluminate cement-based powder accelerator comprises the following steps: 5000g of aluminate cement, 1500g of sodium carbonate, 1000g of aluminum sulfate, 1000g of sodium sulfate and 500g of hydrated lime are added into a grinding mixer to be uniformly mixed, and the specific surface area reaches 350m2And/kg, the aluminate cement-based powder accelerator is obtained after the inspection according to the building material industry standard accelerator for sprayed concrete (JC 477-.
The setting time test is carried out according to the regulations of the building material industry standard accelerating agent for sprayed concrete by respectively adopting different cements, such as portland cement, ordinary portland cement, composite portland cement, fly ash portland cement and mineral powder portland cement, wherein the test results are shown in table 1, wherein the cement is 400g, the aluminate cement-based powder accelerating agent is 24g and the water is 160 g.
The compressive strength was measured according to the standard of "accelerator for shotcrete" in the building material industry using various cements such as portland cement, ordinary portland cement, composite portland cement, fly ash portland cement, and powdered ore portland cement, wherein the test results are shown in table 1, and the cement is 900g, the standard sand is 1350g, the aluminate cement-based powdered accelerator is 54g, and the water is 450 g.
TABLE 1 setting time and compression Strength test results for different cements
As can be seen from Table 1, the aluminate cement-based powder accelerator has good matching property with various portland cements, and has good applicability to portland cement, ordinary portland cement, fly ash portland cement and the like when the addition amount of the aluminate cement-based powder accelerator is fixed to be 6%. The aluminate cement-based powder accelerator has better accelerating effect on portland cement and common portland cement, the initial setting time is less than 3min, the final setting time is less than 7min, the mechanical property is better, the compressive strength of 1d can reach more than 10MPa, and the compressive strength ratio of 28d can reach more than 90%. (it will be understood that the results of each test are not identical for the values of setting time and compressive strength, and for better comparison, the invention has been carried out for two systems of the same number in the same table, at the same time period)
In this example, the influence of different amounts of the powder accelerator on the setting time and compressive strength of the system was also examined, and the results are shown in table 2 below, taking portland cement as an example.
TABLE 2 setting time and compressive strength test results of powder accelerators with different mixing amounts
As can be seen from Table 2, as the addition amount of the aluminate cement-based powder accelerator is increased, the initial setting time and the final setting time are gradually shortened, particularly when the addition amount is increased from 4% to 6%, but as the addition amount continues to increase, the setting time is not substantially shortened any more; similarly, the ratio of the 1d compressive strength to the 28d compressive strength is greatly improved firstly, but the subsequent increase is smaller or even slightly reduced (but is considered to be basically unchanged in practical application) according to the change rule of the setting time along with the increase of the mixing amount of the powder accelerator. Within the range of the mixing amount, the requirements on the setting time and the compressive strength can be better met.
Example 2
The difference between the aluminate cement-based powder accelerator of the embodiment and the embodiment 1 is that the addition amount of each raw material is different, specifically, 4000g of aluminate cement, 2000g of sodium carbonate, 1500g of aluminum sulfate, 1500g of sodium sulfate and 1000g of hydrated lime, and the preparation method and the performance test method are the same as those in the embodiment 1, and are not repeated.
The setting time and compressive strength test results of the aluminate cement-based powder accelerator of the present example with different cements are shown in table 3.
TABLE 3 setting time and compression Strength test results for different cements
As can be seen from the comparison between Table 3 and Table 2, the aluminate cement-based powder accelerator of the present invention has a better compatibility with various portland cements when the composition of the powder accelerator is varied within the specified ratio range. Similarly, when the fixed mixing amount is 6%, the cement has better applicability to portland cement, ordinary portland cement, fly ash portland cement and the like. The aluminate cement-based powder accelerator has better accelerating effect on portland cement, the initial setting time is less than 3min, the final setting time is less than 6min, the mechanical property is better, the compressive strength of 1d can reach more than 10MPa, and the compressive strength ratio of 28d can reach more than 90%.
Example 3
The difference between the aluminate cement-based powder accelerator of the embodiment and the embodiment 1 is that the addition amount of each raw material is different, specifically, 6000g of aluminate cement, 1000g of sodium carbonate, 1000g of aluminum sulfate, 1000g of sodium sulfate and 1000g of hydrated lime, and the preparation method and the performance test method are the same as those in the embodiment 1, and are not repeated.
The setting time and compressive strength test results of the aluminate cement-based powder accelerator of the present example with different cements are shown in table 4.
TABLE 4 setting time and compression Strength test results for different cements
As can be seen from the comparison of Table 4 with tables 2 and 3, the aluminate cement-based powder accelerator of the present invention has a better compatibility with various portland cements when the composition of the accelerator is varied within the specified ratio range. Similarly, when the fixed mixing amount is 6%, the cement has better applicability to portland cement, ordinary portland cement, fly ash portland cement and the like. The aluminate cement-based powder accelerator has better accelerating effect on portland cement, the initial setting time is less than 3min, the final setting time is less than 6min, the mechanical property is better, the compressive strength of 1d can reach more than 10MPa, and the compressive strength ratio of 28d can reach more than 90%.
Comparative example 1
The mixing amount of the fixed powder accelerator is 6% of the mass of cement (namely the mass of the cementing material), the fixed sodium carbonate is 1500g, the aluminum sulfate is 1500g, the sodium sulfate is 1500g, the slaked lime is 1500g, the amounts of the changed aluminate cement are 0g, 2000g, 4000g, 5000g, 6000g and 8000g respectively, and the change rules of the aluminate cement on the setting time, the 1d compressive strength and the 28d compressive strength ratio are contrastively observed by adopting the silicate cement. The other operations were the same as in example 1.
Referring to the test method of example 1, the test results of this comparative example are shown in table 5.
TABLE 5 influence of aluminate cements on setting time and compressive Strength testing
As can be seen from Table 5, when the amount of the aluminate cement in the powder accelerator component is fixed at 6%, the initial setting time and the final setting time of the portland cement are both shortened and then lengthened with the increase of the amount of the aluminate cement, the compressive strength at 1d is increased and then decreased, and the compressive strength ratio at 28d is increased and then decreased.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The aluminate cement-based powder accelerator is characterized by comprising aluminate cement, sodium carbonate, aluminum sulfate, sodium sulfate and hydrated lime; the powder accelerator comprises the following components in parts by weight: aluminate cement: sodium carbonate: aluminum sulfate: sodium sulfate: slaked lime (40-60): (10-20): (10-20): (10-20): (5-20).
2. The aluminate cement-based powder accelerator according to claim 1, wherein the aluminate cement is an aluminate cement meeting the requirements in table 1 of national standard "aluminate cement" GB/T201-.
3. The aluminate cement-based powder accelerator according to claim 1, wherein the sodium carbonate is industrial soda ash meeting the requirements of class II first-class products and/or qualified products in the national standard of Industrial sodium carbonate GB 210-1992.
4. The aluminate cement-based powder accelerator according to claim 1, wherein the aluminum sulfate is solid powder particles of aluminum sulfate class I or II in chemical industry standard "industrial aluminum sulfate" HG/T2225-2010.
5. The aluminate cement-based powder accelerator according to claim 1, wherein the sodium sulfate is anhydrous sodium sulfate solid powder particles in Table 1 in accordance with chemical industry standard cosmetic sodium sulfate HG/T4535-.
6. The aluminate cement-based powder accelerator according to claim 4 or 5, wherein the particle sizes of the aluminum sulfate and the sodium sulfate are not less than 200 meshes.
7. The aluminate cement-based powder accelerator according to claim 1, wherein the slaked lime is a slaked lime powder that meets the first-class and/or qualified requirements of calcium slaked lime powder in building material industry Standard JC/T481-92.
8. The method for preparing the aluminate cement-based powder accelerator according to any one of claims 1 to 7, comprising the steps of: grinding and uniformly mixing the components according to the weight ratio to obtain the composition; the specific surface area of the aluminate cement-based powder accelerator is 300-500 m2/kg。
9. The use of the aluminate cement-based powder accelerator according to any one of claims 1 to 7 in cement.
10. Use according to claim 9, wherein the cement is any one of portland cement, ordinary portland cement, composite portland cement, fly ash portland cement, slag portland cement in accordance with national standard "general portland cement" GB175-2020 table 1, table 2 and table 3.
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