CN111116151A - High-temperature resistant consolidation material and construction method thereof - Google Patents
High-temperature resistant consolidation material and construction method thereof Download PDFInfo
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- CN111116151A CN111116151A CN201911367586.4A CN201911367586A CN111116151A CN 111116151 A CN111116151 A CN 111116151A CN 201911367586 A CN201911367586 A CN 201911367586A CN 111116151 A CN111116151 A CN 111116151A
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- temperature
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- aluminate cement
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Classifications
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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
- C04B28/06—Aluminous cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/12—Supplying or proportioning liquid ingredients
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- 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
Abstract
The invention discloses a high-temperature resistant consolidation material and a construction method thereof. The material comprises a gelling agent, coarse aggregate, fine aggregate, superfine powder, explosion-proof fiber, an early strength agent, a burning promoter, an air entraining agent and a water reducing agent. According to the invention, the high-temperature resistant consolidation material with excellent performance, energy conservation, environmental protection, rapid construction, high efficiency and long service life is obtained by designing and researching consolidation material components, selecting high-temperature resistant aggregate, researching additives influencing material performance and analyzing material performance through systematic research. The material has the characteristics of no strength loss and no bearing capacity loss under the conditions of long-time flame jet flow and high temperature environment of 500-1500 ℃, has the stronger material characteristics of high-temperature service and healing, and belongs to the technical field of high-temperature resistant structural materials; overcomes the defects that the container made of the consolidation material prepared by the common Portland cement has poor high temperature resistance, brittle and easy cracking property and poor anti-explosion impact capability when being subjected to high temperature, and is easy to cause the fracture damage of components and even the loss of bearing capacity after being cracked or cracked at high temperature, and the like.
Description
Technical Field
The invention relates to a high-temperature-resistant consolidation material and a construction method thereof, belonging to the technical field of high-temperature-resistant structural materials.
Background
The high temperature resistant consolidation material has been widely used in the thermal equipment of metallurgy, chemical industry, petroleum, light industry, building materials and other industries and the structures which are subjected to high temperature for a long time, such as the linings of industrial chimneys or flues, the refractory linings of industrial kilns, the foundations and the shells of high temperature boilers, high temperature flame impact areas and the like. The container made of the consolidation material prepared by the common cement has poor high temperature resistance, brittle and easy cracking property and poor anti-explosion impact capability when being subjected to high temperature (up to more than 1500 ℃), and structural members are easy to break and damage or even lose bearing capacity after cracking or bursting at high temperature, and the defects are not enough to ensure the safe use time of the common concrete protection engineering structure, thereby possibly causing major safety accidents. Meanwhile, although the initial investment is low, the workload of later maintenance and repair is large, and the economy and the effectiveness in the service period are obviously poor.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a high temperature resistant consolidation material and a construction method thereof, wherein the material has material characteristics of "high temperature service" and "stronger for healing" without losing strength and bearing capacity under the conditions of long-time flame jet and high temperature environment of 500-1500 ℃.
In order to achieve the purpose, the invention adopts the following technical scheme:
according to one aspect of the present invention, there is provided a high temperature resistant consolidated material, comprising, in parts by weight:
in the above components, the gelling agent is a composite of a plurality of aluminate cements. The gelling agent, Al thereof2O4Aluminate cement with the content more than or equal to 50 wt% and the granularity less than or equal to 45 mu m.
The aluminate cement can be compounded by two or more of A50 aluminate cement, A60 aluminate cement, A70 aluminate cement, A80 aluminate cement and the like. More preferably, the gelling agent is compounded by adopting A80 aluminate cement and one or more of other cements (A50 aluminate cement, A60 aluminate cement and A70 aluminate cement), and the compounding ratio is determined according to the design performance of the material. More preferably, the compounding ratio of the A80 aluminate cement to other cement is 2: 1-1: 3.
The coarse aggregate, Al thereof2O3The content is more than or equal to 75 wt%, and the particle size is 20-10 mm, and the particle size can be one or two of bauxite and high-aluminum materials.
The fine aggregate, Al thereof2O3The content is more than or equal to 80 wt% or SiC content is more than or equal to 90 wt%. The fine aggregate can be one or more of alumina, silicon carbide, brown fused alumina and the like. The particle size distribution of the fine aggregate is within five particle size ranges of 10-8 mm, 8-5 mm, 5-3 mm, 3-1 mm and 1-0.1 mm. Wherein, the proportion of the fine aggregate distributed in 10-8 mm accounts for 5-30% of the total amount of the fine aggregate, the proportion of the fine aggregate distributed in 8-5 mm accounts for 5-30% of the total amount of the fine aggregate, the proportion of the fine aggregate distributed in 5-3 mm accounts for 5-30% of the total amount of the fine aggregate, the proportion of the fine aggregate distributed in 3-1 mm accounts for 5-30% of the total amount of the fine aggregate, the proportion of the fine aggregate distributed in 1-0.1 mm accounts for 5-30% of the total amount of the fine aggregate, and the percentage content of the total amount of each particle.
The grain size of the superfine powder is generally 0.1-5 μm. The superfine micro powder is mainly prepared by compounding activated alumina micro powder and silicon micro powder according to different proportions, and the compounding proportion range can be 2: 1-1: 2. The activated alumina fine powder, Al thereof2O3The content is more than or equal to 99wt percent, and D50 is less than or equal to 3 mu m; the silicon powder, SiO thereof2The content is more than or equal to 93 wt%, and the average grain diameter is 0.1-0.3 μm.
The explosion-proof fiber can be one of polypropylene fibers with different fineness and lengths, the length is preferably 3-6 mm, and the fineness can be 38-42 μm. Specifically, the length is 5mm, and the fineness may be 40 μm.
The early strength agent is an organic composite early strength agent. Preferably, the calcium formate and the triethanolamine are compounded, wherein the compounding ratio of the calcium formate to the triethanolamine is 1: 2-3: 1, and the product specifications are industrial products.
The main selection of the burning promoter is metal silicon and boric acid, the metal silicon and the boric acid are compounded to achieve the sintering effect under different use conditions, the proportion of the two burning promoters is selected according to specific environments, and for example, the compounding proportion of the metal silicon and the boric acid can be 20: 1-5: 1. Wherein Si of the metallic silicon is more than or equal to 95 wt%, and the particle size can be 200 meshes; the boric acid is an industrial grade product.
The air entraining agent can be one of petroleum sulfonate and alkyl aromatic sulfonic acid, and petroleum sulfonate is mainly preferred.
The water reducing agent is a basf FS series, and can be one of a basf water reducing agent FS20 and FS 10; FS20 is mainly preferred.
According to another aspect of the present invention, there is provided a method for constructing a high temperature resistant consolidated material, the method comprising the steps of:
1) weighing raw materials according to parts by weight (and component purity);
2) pouring the weighed raw materials into an inclined stirrer for mixing, controlling the rotating speed of a rotor to be 135-153 r/min, and controlling the mixing time to be 3-5 minutes;
3) and (4) screening the mixed materials, inspecting the addition amount of water, and filling the qualified materials into a waterproof packaging bag for sealing to form a product.
4) During cast-in-place/spray construction, adding the inspection water according to the addition amount, and stirring for 5-8 minutes until the inspection water is fully mixed;
5) adjusting the addition of water, detecting the material flow value, and forming a construction product capable of pouring/spraying after the material flow value is qualified.
The high-temperature resistant consolidation material provided by the invention has the following innovations and beneficial effects:
(1) the gelatinizing agent introduced by the invention is compounded by two or more aluminate cements, so that the workability of the material is ensured, and the characteristics of quick hardening, high strength, good thermal stability, high refractoriness and the like in use are ensured. The cement has hydration hardening and strength increasing during heating, and the chemical composition of the composite cement contains more A12O3Therefore, after the ceramic combination is generated by sintering at 1200 ℃, the ceramic combination has higher sintering strength and refractoriness, and the maximum service temperature reaches more than 1600 ℃.
(2) The invention introduces alumina micropowder and silica micropowder as superfine micropowder, can react at high temperature to generate a needle-rod-shaped or whisker-shaped mullite network structure, and can effectively improve the structural strength and the thermal shock resistance and the scouring resistance.
(3) The introduced water reducing agent is dissolved in water and then adsorbed on the surface of a disperse phase, so that the repulsive force among particles is increased, and free water wrapped in an agglutination structure formed by the disperse particles is released to play a role in lubricating and dispersing the particles among the particles, so that the water consumption for mixing the castable is reduced, the porosity of a consolidation material is reduced, and the volume density and the strength are improved.
(4) The sintering promoter introduced by the invention has proper liquid phase during sintering, which often greatly promotes the particle rearrangement and mass transfer processes, or the sintering is promoted by generating a new cementing material phase through liquid-solid reaction at a lower temperature, and the occurrence of the liquid phase may be that the melting point of the sintering promoter is lower; ensures the sintering of the material at different temperatures, especially at medium and low temperatures, and is beneficial to improving the strength performance of the consolidated material in the continuous high-temperature use process. B formed by boric acid after oxidation2O3Can be mixed with Al in the matrix2O3Formation of 9Al at high temperature2O3·2B2O3The columnar crystals are distributed in the matrix and the gaps of the refractory material, so that the porosity is reduced, and the medium-low temperature strength of the material is improved.
The high-temperature-resistant consolidation material provided by the invention has the advantages that through the research on the design and research on the components of the consolidation material, the selection of high-temperature-resistant aggregate and the research on the performance of the material, the additive influencing the performance of the material is researched, the mechanical property, the heat energy transfer and the substance conduction of the material are realized, the strength of the material is not lost, the bearing capacity is not lost, and the performances of in-situ sintering, high-temperature service, healing and self-repairing are realized in the high-temperature service process (wherein, the in-situ sintering is sintering which can be formed in the high-temperature service environment of the material, mainly ceramic sintering, and the self-repairing is that the material can react at a certain temperature to make up the defects of the material under the condition that microcracks or cracks exist in the material). The high-strength fireproof composite material has the characteristics of convenience and rapidness in production, environment-friendly and efficient construction, high material hardening speed, high strength, good thermal stability, high refractoriness and the like. The use of conventional limestone, quartz sand, mineral powder and portland cement based consolidation materials is compared with the use of the high temperature consolidation materials of the present invention in table 1.
TABLE 1 comparison of the Properties of conventional consolidated materials and high temperature consolidated materials of the invention
As can be seen, the compressive strength of the high-temperature consolidation material is obviously higher than that of the traditional consolidation material, and the high-temperature consolidation material has the performance characteristics of high-temperature service and stronger healing.
Detailed Description
The present invention will be further described with reference to specific examples, which are provided for illustrative purposes only and are not intended to limit the scope of the present invention. The raw materials and their contents in parts by mass of each example and comparative example of the high temperature resistant consolidated material of the present invention are listed in table 2.
In examples 1-3 and comparative examples 1-2, the components of the high temperature resistant consolidation material were accurately weighed according to the parts by weight shown in table 2, poured into an inclined blender and mixed, the rotor speed was controlled at 135-153 r/min, the mixing time was controlled at 3-5 minutes, (after mixing, screening and water addition testing, after passing), the mixture was packed into a waterproof packaging bag and sealed for storage (forming a product).
TABLE 2 high temperature resistant consolidation Material composition
Examples 1-3 the components were specifically composed as follows:
examples 1 to 3
The gelling agent is formed by compounding A80 aluminate cement and A60 aluminate cement according to the proportion of 1:1, compounding A80 aluminate cement and A70 aluminate cement according to the proportion of 1:1, and compounding A80 aluminate cement and A50 aluminate cement according to the proportion of 1:1.
The coarse aggregate is high-alumina material and secondary alumina.
The fine aggregate is secondary alumina, silicon carbide and brown corundum respectively, the average particle size of the fine aggregate is 10-8 mm, 8-5 mm, 5-3 mm, 3-1 mm and 1-0.1 mm, and the proportion of the fine aggregate in the five particle size ranges to the total amount of the fine aggregate is the same.
The ultrafine powders are the composite of activated alumina powder and silica powder, and the proportion of the ultrafine powders in examples 1 to 3 is 1:1, 1.5:1 and 1:1.5, respectively.
The explosion-proof fibers are all polypropylene fibers, and the length of the explosion-proof fibers is 3mm and the fineness of the explosion-proof fibers is 40 mu m in examples 1 to 3.
The early strength agents are the (industrial grade products) of the compound of calcium formate and triethanolamine, and the proportion of the calcium formate to the triethanolamine in the examples 1 to 3 is 1:2 respectively; 1: 1; 1.5:1.
The burning accelerant is the composition of metal silicon and boric acid, the metal silicon Si is more than or equal to 95 wt%, the grain diameter is 200 meshes, and the boric acid is an industrial grade product; the ratio of the two in examples 1-3 was 10: 1.
The air entraining agents are respectively petroleum sulfonate;
the water reducing agents are respectively Basff water reducing agents FS 20.
Comparative examples 1-2 the components were specifically composed as follows:
the gelling agent in comparative example 1 was only a80 aluminate cement, the gelling agent in comparative example 2 was portland cement and aluminate cement, and the other components in comparative examples 1 and 2 were the same as in example 1.
The high-temperature-consolidated materials prepared in examples 1 to 3 and comparative examples 1 to 2 were poured into 100mm × 100mm × 100mm molds after adding an appropriate amount of water and uniformly stirring, naturally cured (1D, 7D, 14D, and 28D), and baked at 110 ℃ for 24 hours after curing at different temperatures (500 ℃ × 3h, 700 ℃ × 3h, 900 ℃ × 3h, 1100 ℃ × 3h, and 1500 ℃ × 3 h). The compressive strength of the test sample is tested according to the national standard, and the test result is shown in Table 3.
TABLE 3 Performance index of high temperature resistant consolidated materials prepared in accordance with the present invention
When the high-temperature resistant consolidation materials of the embodiments 1-3 are used for casting or spraying construction on site, water can be added according to the addition of the inspection water, and the materials are stirred for 5-8 minutes until the materials are fully mixed; and then adjusting the adding amount of water, detecting the material flow value, forming a constructable product after the material flow value is qualified, and then pouring or spraying.
Claims (10)
1. The high-temperature-resistant consolidation material is characterized by comprising the following components in parts by weight:
wherein the gelling agent is compounded by two or more aluminate cements.
2. The refractory consolidation material of claim 1, wherein the aluminate cement has Al2O4The content is more than or equal to 50wt percent, and the granularity is less than or equal to 45 mu m.
3. The high temperature resistant cementitious material of claim 1, wherein the gelling agent is a80 aluminate cement compounded with one or more selected from a50 aluminate cement, a60 aluminate cement, and a70 aluminate cement.
4. The high-temperature-resistant consolidation material of claim 3, wherein the A80 aluminate cement is compounded with one or more selected from A50 aluminate cement, A60 aluminate cement and A70 aluminate cement in a compounding ratio of 2: 1-1: 3.
5. The high-temperature-resistant consolidation material of claim 1, wherein the ultrafine powder is activated alumina powder and silica powder in a ratio of 2: 1-1: 2; wherein, the active alumina micro powder is Al2O3The content is more than or equal to 99wt percent, and D50 is less than or equal to 3 mu m; the silicon powder, SiO thereof2The content is more than or equal to 93 wt%, and the average grain diameter is 0.1-0.3 μm.
6. The high-temperature-resistant consolidation material of claim 5, wherein the sintering promoter is a composite of metallic silicon and boric acid, the composite ratio is 20: 1-5: 1, wherein Si of the metallic silicon is more than or equal to 95 wt%, and the boric acid is an industrial-grade product.
7. The high temperature resistant consolidated material of claim 1,
the coarse aggregate is one or two of bauxite and high-alumina material, and Al of the coarse aggregate2O3The content is more than or equal to 75 wt%, and the particle size is 20-10 mm;
the fine aggregate is one or more of alumina, silicon carbide and brown corundum, and the alumina and the brown corundum are Al2O3The content of the silicon carbide is more than or equal to 80 wt%, the SiC content of the silicon carbide is more than or equal to 90 wt%, and the particle size distribution of the fine aggregate is within five ranges of 10-8 mm, 8-5 mm, 5-3 mm, 3-1 mm and 1-0.1 mm.
8. The high temperature resistant consolidated material of claim 1,
the air entraining agent is one of petroleum sulfonate and alkyl aromatic sulfonic acid;
the water reducing agent is one of a basf water reducing agent FS20 and FS 10;
the early strength agent is an organic composite early strength agent.
9. The high-temperature-resistant consolidation material of claim 8, wherein the early strength agent is calcium formate and triethanolamine, and the ratio of calcium formate to triethanolamine is 1: 2-3: 1.
10. A method of constructing a refractory consolidation material as in claim 1, comprising the steps of:
pouring the weighed raw materials into an inclined stirrer for mixing, wherein the rotating speed of a rotor is 135-153 r/min, and the mixing time is 3-5 minutes;
screening the materials after mixing, carrying out water addition inspection, bagging and sealing after the inspection is qualified to form a product;
during on-site construction, adding the water according to the addition amount qualified by inspection, and stirring and mixing for 5-8 minutes;
adjusting the addition of water, detecting the material flow value, and forming a constructable product after the detection is qualified.
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