CN113968714B - Aluminate cement-based spraying mortar and preparation method thereof - Google Patents
Aluminate cement-based spraying mortar and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B28/14—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 calcium sulfate 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
- C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
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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
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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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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Abstract
The invention belongs to the technical field of mining, and particularly relates to aluminate cement-based sprayed mortar and a preparation method thereof. The injection mortar consists of a cementing material, a composite additive, sand and water according to the weight ratio of 1: 0.03-0.06: 1.5-3.0: 0.40-0.50; wherein: the cementing material is composed of the following raw materials in parts by weight: 20-40 parts of aluminate cement, 20-40 parts of portland cement, 10-30 parts of slag powder and 10-30 parts of gypsum; the composite additive is composed of the following raw materials in parts by weight: 20-40 parts of a water reducing agent, 10-30 parts of slaked lime, 10-30 parts of sodium carbonate, 10-30 parts of anhydrous sodium sulphate and 5-10 parts of redispersible latex powder. The spraying mortar has the characteristics of high setting and hardening speed, high early strength, micro-expansion and the like, and is suitable for engineering application.
Description
Technical Field
The invention belongs to the technical field of mining, and particularly relates to aluminate cement-based sprayed mortar and a preparation method thereof.
Background
In the building engineering such as coal mine construction, road and railway tunnel excavation, the surrounding rock needs to be quickly reinforced by using sprayed mortar (or sprayed concrete). At present, the cementing material of the common spraying mortar is mainly portland cement, and the following problems are always existed in the actual construction: firstly, the adaptability of silicate cement and an accelerator is poor, the general silicate cement (belonging to silicate cement) comprises silicate cement, common silicate cement, composite silicate cement, fly ash silicate cement, slag silicate cement and the like, the different types of silicate cement and accelerators have adaptability problems, and if the adaptability is poor, the problems of long initial setting time and final setting time, large 28d compressive strength loss and the like can be caused; and secondly, the sprayed mortar using silicate cement as a cementing material is easy to shrink and crack.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
Aiming at the defects of the existing spraying mortar, the invention researches and develops the aluminate cement-based spraying mortar, and aims to provide the aluminate cement-based spraying mortar and the preparation method thereof, so as to solve the problems that the quick setting performance of the existing spraying mortar can not meet the construction requirement and is easy to shrink and crack, and the like.
In order to achieve the purpose, the invention provides the following technical scheme:
the aluminate cement-based sprayed mortar consists of a cementing material, a composite additive, sand and water in a weight ratio of 1: 0.03-0.06: 1.5-3.0: 0.40-0.50; wherein:
the cementing material is composed of the following raw materials in parts by weight: 20-40 parts of aluminate cement, 20-40 parts of portland cement, 10-30 parts of slag powder and 10-30 parts of gypsum;
the composite additive is composed of the following raw materials in parts by weight: 20-40 parts of a water reducing agent, 10-30 parts of slaked lime, 10-30 parts of sodium carbonate, 10-30 parts of anhydrous sodium sulphate and 5-10 parts of redispersible latex powder.
In the above-mentioned aluminate cement-based spraying mortar, preferably, the aluminate cement is an aluminate cement meeting the requirements in table 1 of national standard GB/T201-; the portland cement is 42.5 grade cement in table 5 in accordance with national standard GB175-2020 Universal portland cement.
In the aluminate cement-based sprayed mortar, the slag powder is preferably slag powder of grade S95 or above in Table 1 in accordance with national standard GB/T18046-2017 granulated blast furnace slag powder for cement, mortar and concrete.
In the aluminate cement-based spraying mortar, the gypsum preferably meets the technical requirements in the national standard GB/T9776-2008 building gypsum.
In the aluminate cement-based injection mortar, the water reducing agent is preferably a commercially available naphthalene powder water reducing agent, and the water reducing rate is not less than 20%.
In the aluminate cement-based sprayed mortar, the slaked lime is preferably slaked lime powder meeting the requirements of first-class products and/or qualified products in building material industry standard JC/T481-92 construction slaked lime powder.
In the aluminate cement-based spraying mortar, the sodium carbonate is preferably industrial soda ash meeting the requirements of first-class products and/or qualified products in national standard GB210-1992 Industrial sodium carbonate.
In the aluminate cement-based shotcrete, the anhydrous sodium sulfate is preferably a commercially available anhydrous sodium sulfate powder having a mass purity of 95% or more.
In the above aluminate cement-based shotcrete, preferably, the redispersible latex powder is a commercially available powder redispersible latex powder.
The invention also provides a preparation method of the aluminate cement-based jet mortar, which comprises the following steps:
firstly, adding a water reducing agent, hydrated lime, sodium carbonate, anhydrous sodium sulphate and redispersible latex powder into a mixer in proportion and uniformly mixing to obtain a composite additive;
secondly, adding aluminate cement, portland cement, slag powder and gypsum into a stirrer in proportion, and stirring uniformly to obtain a cementing material;
and step three, uniformly mixing the composite additive obtained in the step one, the cementing material obtained in the step two, sand and water according to a ratio to obtain the aluminate cement-based spraying mortar.
Has the advantages that:
the injection mortar has the characteristics of high setting and hardening speed (initial setting can be as short as 2.5min, final setting can be as short as 6min), high early strength (the compressive strength can reach 10MPa in 6h and 20MPa in 1 d), micro-expansion and the like. The spraying mortar has the characteristics of short production period and low production cost, does not generate three wastes in the whole process, and is environment-friendly and nuisanceless.
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 included to illustrate an exemplary embodiment of the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic view showing a process for preparing a composite admixture for injection mortar according to the present invention;
FIG. 2 is a schematic view of the preparation process of the cementitious material in the injection mortar 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 aluminate cement-based sprayed mortar is prepared from a cementing material, a composite additive, sand and water according to the weight ratio of 1: 0.03-0.06: 1.5-3.0: 0.40-0.50 (such as 1: 0.03: 1.5: 0.40, 1: 0.06: 3.0: 0.50, 1: 0.04: 2.0: 0.45, 1: 0.05: 1.5: 0.45 or 1: 0.03: 2.5: 0.45); wherein:
the cementing material is composed of the following raw materials in parts by weight: 20-40 parts (for example, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts or 40 parts) of aluminate cement, 20-40 parts (for example, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts or 40 parts) of portland cement, 10-30 parts (for example, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts or 30 parts) of slag powder, 10-30 parts (for example, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts or 30 parts) of gypsum, and 10-30 parts (for example, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts or 30 parts) of gypsum;
the composite additive is composed of the following raw materials in parts by weight: 20 to 40 parts (for example, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts or 40 parts) of a water reducing agent, 10 to 30 parts (for example, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts or 30 parts) of hydrated lime, 10 to 30 parts (for example, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts or 30 parts) of sodium carbonate, 10 to 30 parts (for example, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts or 30 parts) of anhydrous sodium sulphate, 5 to 10 parts (for example, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts) of a redispersible latex powder.
The raw materials comprise:
the aluminate cement is the aluminate cement meeting the requirements in the national standard GB/T201-2015 aluminate cement in Table 1, and the aluminate cement used in the following embodiment is concretely CA60 type aluminate cement;
the portland cement is 42.5 grade cement in table 5 which accords with national standard GB175-2020 Universal portland cement;
the slag powder is S95 grade or above in the table 1 which accords with the national standard GB/T18046-2017 granulated blast furnace slag powder used in cement, mortar and concrete;
the gypsum meets the technical requirements in the national standard GB/T9776-2008 building gypsum;
the water reducing agent is a commercial naphthalene powder water reducing agent, and the water reducing rate is not less than 20 percent; the water reducing agent used in the following examples was purchased from Kyowa Kagaku Kogyo Co., Ltd;
the slaked lime is slaked lime powder meeting the requirements of first-class products and/or qualified products in a building material industry standard JC/T481-92 'construction slaked lime powder', and the slaked lime powder meeting the requirements of first-class products of calcium slaked lime powder in the industry standard is specifically described in the following embodiment;
the sodium carbonate is industrial soda ash meeting the requirements of first-class products and/or qualified products in national standard GB210-1992 'industrial sodium carbonate', and the sodium carbonate in the following embodiment is particularly a class II first-class product meeting the national standard;
the anhydrous sodium sulfate is commercially available anhydrous sodium sulfate powder, and the mass purity of the anhydrous sodium sulfate is more than 95%;
the redispersible latex powder is commercially available powder redispersible latex powder; redispersible latex powders used in the following examples were obtained from Beixin chemical technology, Inc. of Hebei.
In the aluminate cement-based sprayed mortar, aluminate cement and portland cement are compounded to serve as main cementing materials, and the aluminate cement is mainly composed of calcium aluminate, has the characteristics of quick hardening and early strength, and can ensure high early strength; the silicate cement takes silicate and aluminate as main minerals, and can ensure the continuous increase of the later strength. The slag powder can reduce the use amount of portland cement and aluminate cement, thereby reducing the cost; and secondly, the continuous increase of the later strength can be ensured. Gypsum contributes to early ettringite formation and thus contributes to early strength. The water reducing agent can reduce the amount of water used, thereby being beneficial to shortening of the setting time and compressive strength. The hydrated lime can increase the plasticity of the mixture; secondly, the sodium carbonate can react to generate calcium carbonate, thereby being beneficial to the pressure resistance. The sodium carbonate can accelerate the hydration of portland cement and the like, so that the portland cement has shorter setting time; secondly, the calcium carbonate can be generated with hydrated lime. The anhydrous sodium sulphate can provide sulphate ions, thereby ensuring early ettringite generation, and being beneficial to early strength. The redispersible latex powder is beneficial to improving the bonding property of the sprayed mortar, thereby reducing the rebound and the bonding strength after hardening.
The preparation method of the aluminate cement-based spraying mortar comprises the following steps:
firstly, adding a water reducing agent, hydrated lime, sodium carbonate, anhydrous sodium sulphate and redispersible latex powder into a mixer in proportion, uniformly mixing, detecting the setting time according to national standard GB 8076-;
secondly, adding aluminate cement, portland cement, slag powder and gypsum into a stirrer in proportion, stirring until the mixture is uniform, detecting the setting time and the compressive strength by referring to the national standard GB 8076-2008 concrete admixture, and obtaining the cementing material after the detection is qualified, wherein the preparation process is shown as figure 2;
and step three, uniformly mixing the composite additive obtained in the step one, the cementing material obtained in the step two, sand and water according to a ratio to obtain the aluminate cement-based spraying mortar. The performance detection of the setting time and the compressive strength is carried out by referring to an industry standard JC 477-.
Example 1
The preparation method of the aluminate cement-based spraying mortar of the embodiment is as follows:
firstly, adding 3000g of water reducing agent, 2000g of hydrated lime, 2000g of sodium carbonate, 2000g of anhydrous sodium sulphate and 1000g of redispersible latex powder into a mixer for uniform mixing, and referring to the national standard GB
8076-;
secondly, stirring 3000g of aluminate cement, 3000g of portland cement, 2000g of slag powder and 2000g of gypsum in a stirrer until the mixture is uniform, detecting according to national standard GB 8076-;
thirdly, the composite additive obtained in the first step, the cementing material obtained in the second step, sand and water are proportioned according to the parts by weight: the cementing material, the composite admixture, the sand and the water are uniformly mixed according to the ratio of 1: 0.045: 2.5: 0.45, the initial setting time is 2.8min, the final setting time is 6.2min, the compressive strength of 6h can reach 10.6MPa, the compressive strength of 1d can reach 20.9MPa according to the industrial standard JC 477-.
Example 2
The preparation method of the aluminate cement-based spraying mortar of the embodiment is as follows:
step one, adding 2500g of water reducing agent, 3000g of slaked lime, 1000g of sodium carbonate, 3000g of anhydrous sodium sulphate and 500g of redispersible latex powder into a mixer for uniform mixing, detecting according to national standard GB 8076 plus 2008 concrete admixture, and obtaining the composite admixture after the detection is qualified;
secondly, stirring 2000g of aluminate cement, 4000g of portland cement, 1000g of slag powder and 3000g of gypsum in a stirrer until the mixture is uniform, detecting according to national standard GB 8076-;
thirdly, the composite additive obtained in the first step, the cementing material obtained in the second step, sand and water are proportioned according to the parts by weight: the cementing material, the composite admixture, the sand and the water are uniformly mixed according to the ratio of 1: 0.04: 1.5: 0.5, the initial setting time is 4.5min, the final setting time is 7.9min, the compressive strength of 6h can reach 9.1MPa, the compressive strength of 1d can reach 18.5MPa according to the industrial standard JC 477-.
Example 3
The preparation method of the aluminate cement-based spraying mortar of the embodiment is as follows:
step one, adding 4000g of water reducing agent, 1000g of hydrated lime, 3000g of sodium carbonate, 1000g of anhydrous sodium sulphate and 750g of redispersible latex powder into a mixer for uniform mixing, detecting according to national standard GB 8076 plus 2008 concrete admixture, and obtaining the composite admixture after the detection is qualified;
secondly, stirring 4000g of aluminate cement, 2000g of portland cement, 3000g of slag powder and 1000g of gypsum in a stirrer until the mixture is uniform, detecting according to national standard GB 8076-;
thirdly, the composite additive obtained in the first step, the cementing material obtained in the second step, sand and water are proportioned according to the parts by weight as follows: the cementing material, the composite admixture, the sand and the water are uniformly mixed according to the ratio of 1: 0.06: 3.0: 0.4, the initial setting time is 3.2min, the final setting time is 6.5min, the compressive strength of 6h can reach 10.3MPa, the compressive strength of 1d can reach 20.1MPa according to the industrial standard JC 477-.
Example 4
The aluminate cement-based mortar for injection of the present example is different from example 1 in that: the addition amount of the aluminate cement is different, and other parameters and the preparation method are the same as those in the embodiment 1, and are not described again. Table 1 shows the influence of the amount of aluminate cement added on the performance of the sprayed mortar. The aluminate cement of example 1 was added in an amount of 3000g, and the performance data are shown in Table 1 for comparison.
TABLE 1 influence of the amount of aluminate cement added on the mortar spraying properties
As can be seen from the comparison of the data in Table 1, the initial setting time and the final setting time are both shortened and then prolonged along with the increase of the amount of the aluminate cement, wherein the initial setting time and the final setting time are better when the mixing amount is in the range of 2000 g-4000 g; the compressive strengths of 6h and 1d show the tendency of increasing first and then decreasing, and the compressive strengths of 6h and 1d are better as long as the aluminate cement is added; the 1d expansion rate is gradually increased along with the increase of the aluminate cement amount. The influence of aluminate cement on various performances is combined, and the range of the amount of aluminate cement is recommended to be limited to 2000 g-4000 g.
Example 5
The aluminate cement-based mortar for injection of the present example is different from example 1 in that: the addition amount of the slag powder is different, and other parameters and the preparation method are the same as those in the embodiment 1, and are not described again. Table 2 shows the effect of the addition of slag powder on the performance of the sprayed mortar. The slag powder addition of 2000g was example 1, and the corresponding performance data are listed in table 2 for comparison.
TABLE 2 influence of the addition of slag powder on the mortar properties sprayed
As can be seen from comparison of the data in Table 2, the initial setting time and the final setting time change little at the beginning with the increase of the amount of the slag powder, but the initial setting time and the final setting time are obviously prolonged when the equivalent is increased to 3000g or more; similarly, when the amount of the slag powder is small, the compressive strength of 6h and 1d are good, but when the equivalent weight is increased to 3000g or more, the reduction amplitude of the compressive strength is gradually increased; the expansion ratio of 1d is gradually decreased as the amount of slag powder increases. The influence of the slag powder on various performances is integrated, and the amount of the slag powder is recommended to be limited to 1000-3000 g by combining with cost factors.
Example 6
The aluminate cement-based mortar for injection of the present example is different from example 1 in that: the addition amount of sodium carbonate is different, and other parameters and preparation methods are the same as those in example 1, and are not described again. Table 3 shows the effect of the addition of sodium carbonate on the performance of the sprayed mortar. The amount of sodium carbonate added was 2000g as in example 1, and the corresponding performance data are shown in Table 3 for comparison.
TABLE 3 influence of the amount of sodium carbonate added on the mortar spraying behaviour
As can be seen from the comparison of the data in the table 3, the initial setting time and the final setting time are both shortened and prolonged along with the increase of the amount of the sodium carbonate, wherein the amount of the sodium carbonate is better between 1000g and 3000 g; the compressive strength of 6h and 1d also showed a law of increasing and decreasing, especially when the amount of sodium carbonate was greater than 1000 g; as the amount of sodium carbonate increased, the expansion ratio of 1d did not change much, fluctuating between 0.30. + -. 0.02%. The influence of sodium carbonate on various performances is integrated, and the mixing amount of the sodium carbonate is recommended to be 1000-3000 g.
Example 7
The aluminate cement-based mortar for injection of the present example is different from example 1 in that: the addition amount of water is different, and other parameters and preparation methods are the same as those in example 1, and are not described again. Table 4 shows the effect of the amount of water added on the performance of the sprayed mortar. Where the mass ratio of cement to water was 1: 0.45 for example 1, the corresponding performance data are presented in Table 4 for comparison.
TABLE 4 influence of Water addition on spray mortar Properties
As can be seen from the comparison of the data in Table 4, the initial setting time and the final setting time are gradually prolonged along with the increase of the ratio of the cementing material to water, wherein when the ratio of the initial setting time to the final setting time is more than 1: 0.50, the initial setting time and the final setting time are not in accordance with the requirements; the compressive strength of 6h and 1d is increased and then reduced, wherein when the ratio of the compressive strength to the compressive strength is 1: 0.30, the compressive strength is the minimum, mainly because when the water cement ratio is small, the concrete mixture is dry and thick and cannot be densely formed; the expansion rate of 1d gradually decreases with increasing water-to-gel ratio. The influence of the water-gel ratio on various performances is integrated, and the ratio of the cementing material to water is preferably 1: 0.40-1: 0.50.
The above embodiments show that the injection mortar of the present invention has the characteristics of fast setting and hardening speed (initial setting time can be as short as 2.5min, final setting time can be as short as 6min), high early strength (6h compressive strength can reach 10MPa, 1d compressive strength can reach 20MPa), micro-expansion, etc. The spraying mortar has the characteristics of short production period and low production cost, does not generate three wastes in the whole process, and is environment-friendly and nuisanceless.
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 sprayed mortar is characterized by comprising a cementing material, a composite additive, sand and water in a weight ratio of 1: 0.03-0.06: 1.5-3.0: 0.40-0.50; wherein:
the cementing material is composed of the following raw materials in parts by weight: 20-40 parts of aluminate cement, 20-40 parts of portland cement, 10-30 parts of slag powder and 10-30 parts of gypsum;
the composite additive is composed of the following raw materials in parts by weight: 20-40 parts of a water reducing agent, 10-30 parts of slaked lime, 10-30 parts of sodium carbonate, 10-30 parts of anhydrous sodium sulphate and 5-10 parts of redispersible latex powder.
2. The aluminate cement-based spraying mortar as claimed in claim 1, wherein the aluminate cement is an aluminate cement meeting the requirements in table 1 of national standard GB/T201-; the portland cement is 42.5 grade cement in table 5 in accordance with national standard GB175-2020 Universal portland cement.
3. The aluminate cement-based sprayed mortar of claim 1, wherein the slag powder is a slag powder of grade S95 or above in table 1 in accordance with the national standard GB/T18046-2017 "granulated blast furnace slag powder for use in cement, mortar and concrete".
4. The aluminate cement-based injection mortar according to claim 1, wherein the gypsum meets the technical requirements of national standard GB/T9776-2008 "construction gypsum".
5. The aluminate cement-based jet mortar of claim 1, wherein the water reducing agent is a commercially available naphthalene-based powder water reducing agent, and the water reducing rate is not less than 20%.
6. The aluminate cement-based sprayed mortar of claim 1, wherein the slaked lime is slaked lime powder meeting the requirements of first-class and/or qualified products in building material industry standard JC/T481-92 "construction slaked lime powder".
7. The aluminate cement-based jet mortar according to claim 1, wherein the sodium carbonate is industrial soda ash meeting the requirements of first-class products and/or qualified products in national standard GB210-1992 "Industrial sodium carbonate".
8. The aluminate cement-based jet mortar according to claim 1, wherein the anhydrous sodium sulfate is a commercially available anhydrous sodium sulfate powder having a mass purity of 95% or more.
9. The aluminate cement-based sprayed mortar of claim 1, wherein the redispersible latex powder is a commercially available powdered redispersible latex powder.
10. The preparation method of the aluminate cement-based spraying mortar according to any one of claims 1 to 9, wherein the preparation method comprises the following steps:
firstly, adding a water reducing agent, hydrated lime, sodium carbonate, anhydrous sodium sulphate and redispersible latex powder into a mixer in proportion and uniformly mixing to obtain a composite additive;
secondly, adding aluminate cement, portland cement, slag powder and gypsum into a stirrer in proportion, and stirring uniformly to obtain a cementing material;
and step three, uniformly mixing the composite additive obtained in the step one, the cementing material obtained in the step two, sand and water according to a ratio to obtain the aluminate cement-based spraying mortar.
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| CN114956710A (en) * | 2022-03-01 | 2022-08-30 | 中建八局检测科技有限公司 | High-performance fly ash sprayed concrete for mudstone tunnel and preparation method thereof |
| CN115124314A (en) * | 2022-06-28 | 2022-09-30 | 嘉华特种水泥股份有限公司 | Sprayed concrete and preparation method thereof |
| CN116425485A (en) * | 2023-04-17 | 2023-07-14 | 燕山大学 | Steel fiber cement-based spraying mortar and preparation method thereof |
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