Basalt fiber reinforced autoclaved concrete slab and production process thereof

Abstract

The invention discloses a basalt fiber reinforced autoclaved concrete slab and a production process thereof, and the basalt fiber reinforced autoclaved concrete slab is prepared from the following components in parts by weight: 200 to 300 parts of ordinary silicate low-carbon cement, 100 to 200 parts of quick lime, 100 to 200 parts of carbide slag, 200 to 300 parts of high-calcium fly ash, 210 to 410 parts of crushed marble powder, 150 to 200 parts of biomass ash, 150 to 200 parts of furnace slag, 50 to 100 parts of granulated blast-furnace slag and 3 to 5 parts of phosphogypsum. The water accounts for 60%-65% of the total mass of the materials, the metal aluminum powder accounts for 0.6%-0.8% of the total mass of the materials containing the water, and the modified basalt fiber accounts for 0.7%-1.2% of the total mass of the materials containing the aluminum powder. The defect that rod-shaped or filament basalt fibers are difficult to install and arrange in a mold is overcome, and the same effect as that of using filaments is achieved by using the technology of automatically connecting the short fibers.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building materials, and particularly relates to a basalt fiber reinforced autoclaved concrete slab and a production process thereof. BACKGROUND

[0002] Fabricated building is an important means of building industrialization promoted by the state, and the wall as the building envelope system not only plays a role in heat preservation and insulation, but also bears the role of dividing space, supporting upper load and decorating the internal environment, so the wall material must have sufficient strength, and at the same time must contain enough voids to reduce heat transfer. Whether in civil buildings or industrial buildings, the use of advanced wall materials can significantly reduce the construction and operation energy consumption of buildings, reflecting the level of technological progress of building construction and the energy-saving effect of buildings.

[0003] At present, the wall materials in China are developing towards high specific strength and functionality, and the building envelope structure is mainly composed of wall materials. In the heat preservation design, attention should be paid to controlling the surface temperature, reducing the thermal conductivity, and ensuring the thermal stability. Through reasonable selection of structure form and material, the energy-saving effect can be achieved.

[0004] Nowadays, there are many types of new wall materials, and their functionality and advantages are different. As a lightweight, high-strength, heat-insulating and good heat-insulating building energy-saving material, autoclaved aerated concrete is a typical inorganic lightweight porous material. Autoclaved aerated concrete belongs to the calcium-silicon system lightweight porous concrete. Through the gas evolution reaction, bubbles are introduced into the mixed slurry, and the porous concrete material is formed during the chemical gas evolution reaction and slurry thickening process. After reaching the initial strength, the product obtains certain strength under the condition of high temperature and high pressure. Due to its low bulk density, less material consumption, good heat and sound insulation performance, especially the characteristics of high proportion of industrial solid waste, it is widely used in various buildings. Autoclaved aerated concrete can produce various specifications of wall materials, including bricks, blocks, boards and the like.

[0005] In the past, traditional autoclaved aerated concrete boards need to use steel mesh to increase the toughness of the boards and ensure their seismic resistance. However, due to the high price and large density of steel bars, it undoubtedly increases the weight of autoclaved aerated concrete boards and increases the thermal conductivity of the wall, thereby reducing the thermal resistance of the wall. Therefore, using new materials to replace steel bars can not only reduce the production cost of autoclaved aerated concrete, but also improve the thermal performance of the boards, which obviously has good practical significance.

[0006] Basalt fiber is a kind of high-performance inorganic fiber made of natural basalt ore as raw material, melted at 1450~1500℃, and then drawn into fiber. Its main components are SiO2, Al2O3, Fe2O3, Na2O, CaO, FeO, MgO and TiO2, etc. Compared with carbon fiber, ultra-high molecular weight polyethylene fiber, aramid fiber and other high-performance fibers, basalt fiber has excellent mechanical properties, acid and alkali resistance, high temperature resistance, wave absorption performance, etc. It is extracted from natural ore and does not add any additives in the processing process, which is non-toxic and environmentally friendly "green" fiber material with wide development and application value. Basalt fiber can be widely used in military industry, aerospace, construction, ship body, environmental protection, fire fighting, automobile materials and civil fields, etc. Compared with glass fiber, basalt fiber has excellent alkali resistance, so basalt fiber can be used in high-alkali environment without being easily eroded.

[0007] Patent CN216239325U uses basalt fiber composite rib mesh and composite basalt fiber mesh to replace the rust-prone steel bar or steel mesh. Patent CN118815062A uses basalt fiber bundle to weave into a mesh to replace the steel mesh. The basalt fiber bundle includes warp basalt fiber bundle and weft basalt fiber bundle, and the warp basalt fiber bundle and the weft basalt fiber bundle are bound by basalt fiber silk or bonded by high-temperature adhesive to form a grid shape. The use of basalt filament to form a 3~6m long rod has the problem of difficulty in placing and fixing the basalt fiber rod in the pouring slurry. When installed horizontally, the basalt fiber rod is easy to float in the slurry. If the two ends are pre-installed, anchoring is needed, which requires pre-punching and post-anchoring cutting of the mold frame, which will cause process complexity, mold leakage and other problems.

[0008] Patents CN115626807A and CN115677303A grind the basalt fiber, and the ground basalt fiber will become a slurry and lose the reinforcing effect, so it cannot replace the steel bar or steel mesh, and therefore cannot improve the performance of autoclaved aerated concrete board. The patent does not specify the specifications and models of basalt fiber. Patent CN112456924A uses acetic acid to roughen the surface of basalt fiber, and then modifies the roughened basalt fiber surface with vinyl triethoxysilane and triisostearyl titanate. The modified basalt fiber directly added into the autoclaved aerated concrete cannot make the fiber randomly dispersed or oriented, thereby affecting the function and efficacy of the basalt fiber. SUMMARY

[0009] The basalt fiber reinforced autoclaved concrete slab and the production process thereof provided by the present application solve the problem that the basalt fiber or modified basalt fiber affects the function and effect of the basalt fiber when applied to the autoclaved aerated concrete in the prior art.

[0010] To achieve the above-mentioned object, the present application provides the following technical solutions. The basalt fiber reinforced autoclaved concrete slab provided by the present application comprises the following components by weight: 200-300 parts of ordinary portland cement, 100-200 parts of quicklime, 100-200 parts of carbide slag, 200-300 parts of high-calcium fly ash, 210-410 parts of crushed marble powder, 150-200 parts of biomass ash, 150-200 parts of slag, 50-100 parts of granulated blast furnace slag, 3-5 parts of phosphogypsum, 60%-65% of water based on the total mass of the above-mentioned materials, 0.6%-0.8% of aluminum powder based on the total mass of the materials including water, and 0.7%-1.2% of modified basalt fiber based on the total mass of the materials including the aluminum powder.

[0011] Further, the ordinary portland cement used in the present application has a carbon emission of not more than 665 kg / t, a clinker addition amount of less than 75%, a lithium slag addition amount of greater than 20%, and a steel slag usage amount of greater than 5%; while the ordinary cement clinker addition amount is greater than 80%, the lithium slag and the steel slag cannot be added, and the carbon emission is higher than 800 kg / t.

[0012] Further, the high-calcium fly ash has a CaO content of higher than 10%, the crushed marble powder has a SiO2 content of 50%-60%, and the biomass ash has a K2O content of greater than 6%.

[0013] Further, the modified basalt fiber comprises the following components by weight: 30-40 parts of basalt fiber, 2-5 parts of magnetic nano Fe3O4 powder, 10-20 parts of solid polyamide resin powder, 5-10 parts of gamma-glycidoxypropyltrimethoxysilane, 1-2 parts of polyether polyol, 1-2 parts of film-forming aid EC-5, 1-2 parts of propylene glycol methyl ether, 3-4 parts of emulsifier EZ4528, 3-4 parts of lubricant polyoxyethylene alkyl phenol ether, 0.5-1 part of dodecyl dimethyl betaine, and 50-60 parts of deionized water.

[0014] Further, the modified basalt fiber is prepared by the following steps: A1, the basalt fiber is bundled into a bundle, and the two ends are respectively immersed in 0.5-1.5 mol / L hydrochloric acid with an immersion depth of 0.5-1 mm, and the immersion time is 10-20 min; after the bundle is disassembled, it is cooled for 1-2 h and is ready for use; A2, the magnetic nano Fe3O4 powder is dispersed in deionized water using a JM-120 type colloid mill, the pH value is adjusted to 5-6, then 1%-2% of the water quality of the surface modifier γ-glycidyl ether propyl trimethoxysilane is added, and high-speed stirring is carried out at 88-90°C for 2-3h, after treatment, the magnetic particles are centrifuged, washed with water, and repeated for 3-4 times, dried, and standby; A3, the magnetic nano Fe3O4 particles prepared in step A2 are weighed according to the slurry concentration of 0.1%-0.2%, and are ultrasonically dispersed with 20-25 times of deionized water, and solid polyamide resin powder is added under the condition that the stirring speed is 500-600r / min, and high-speed stirring is continued for 2-3h, and heating is carried out to 90-120°C, and after melting, stirring is carried out for 30-40min; A4, the temperature is lowered to 90-100°C, propylene glycol methyl ether is added as a bath aid, and full stirring is carried out for 10-20min, and the emulsifier EZ4528 is added, and the temperature is kept above 60°C, and full high-speed stirring is carried out for 30-40min, and after the temperature is lowered to 55-65°C, warm water with a temperature of 40-50°C is added, and is dispersed and stirred at a high speed greater than 1500r / min for 10min; 1 / 3 of the warm water with a temperature of 30-40°C is added dropwise, and is dispersed and stirred at a high speed greater than 1500r / min for 20min, and the film-forming aid EC-5 is added; 1 / 3 of the normal temperature water with a temperature of 20-30°C is added dropwise at a high speed, and is stirred at a speed of 500-800r / min for 30min to homogenize and disperse; A5, the lubricant polyoxyethylene alkyl phenol ether and dodecyl dimethyl betaine are added in sequence, and continuous stirring is carried out for 2-3h, and the white uniform basalt continuous fiber impregnant is obtained, and is standby; the basalt fiber in the basalt continuous fiber impregnant in step A1 is added, heated to a temperature of 30-35°C, ultrasonically dispersed, taken out, and dried under the condition of a wind speed of 0.5-1m / s at 25-30°C, and the modified basalt fiber is obtained.

[0015] The application also provides a production process of the basalt fiber reinforced autoclaved concrete slab, which comprises the following steps: S1, preparation of the basalt fiber reinforced autoclaved concrete slurry; S2, preparation of the basalt fiber reinforced autoclaved aerated concrete slab.

[0016] Further, the S1 comprises the following sub-steps: S11, the raw materials are weighed according to the proportion, the marble, slag, granulated blast furnace slag and phosphor gypsum which are crushed to a particle size less than 20mm are mixed uniformly, and then are sent into a ball mill, 60%-65% of the total mass of the added material of tap water with a temperature of 30-35°C is added, and the material is ground to a fineness of 200 mesh with a residue of less than 40%, and the water content is 40%-50%, and the standby high-temperature slurry is obtained, and is stored in a slurry tank for more than 8h for standby. S12, the stirred slurry is weighed, a certain proportion of cement, lime, biomass ash, carbide slag is added into the slurry, the total mass of the added material is 0.6%~0.8% of the metal aluminum powder, and the stirring speed is 500r / min~600r / min for 2~3min, then the basalt fiber reinforced autoclaved concrete slurry needed to be injected into the mold frame is obtained.

[0017] Further, the S2 includes the following sub-steps: S21, the basalt fiber reinforced autoclaved concrete slurry is injected into the mold frame, the modified basalt fiber with a mass of 0.7%~1.2% of the material is added, the mold is pushed through the rectangular electromagnet at a speed of 0.5~1m / s, the modified lubricant is added in the mold, the temperature is adjusted to 50~60℃, and the basalt fibers with end-to-end contact are solidified in the reaction of the modified lubricant; S22, the mold is placed in a room with a temperature of 50℃~70℃, the surrounding is sealed, and after 120min~180min of static standing, the mold is removed; S23, after demolding, the green body is pre-incubated in the furnace at a temperature of 70~85℃ for 2~3h, and then sent to the high-temperature steam curing at a temperature of 180~200℃ and a pressure of 1.0~1.2MPa for 6~8h, to obtain the product autoclaved aerated concrete board.

[0018] Further, the mold frame and the material need to be moved to the lower part of the rectangular electromagnet within 5min, the length of the rectangular electromagnet parallel to the width of the mold frame is 0.9m~1.0m. The current size is changed to control the magnetic strength of the electromagnet to be 1.5~3T. The initial rectangular electromagnet is kept in the upper 20cm~50cm of the mold.

[0019] Further, the mold is pushed through the rectangular electromagnet at a speed of 0.5~1m / s to ensure that the basalt fibers move freely according to the direction of the magnetic lines.

[0020] Further, based on the minimum modification of the autoclaved aerated concrete AAC production process, the basalt fiber is widely applied in production. First, the surface texture of the modified basalt fiber is modified, then the modified basalt fiber is added into the autoclaved aerated concrete slurry, and then the directional arrangement of the basalt fiber in the slurry is realized through electromagnetic induction and current control. The basalt fibers with end-to-end contact are chemically reacted after being overlapped, so as to be "welded" as a whole, realizing the straight-line distribution of the basalt fiber in the slurry, thereby creating conditions for replacing steel bars or steel mesh, achieving the purpose of reducing the bulk density of autoclaved aerated concrete and improving the toughness of the board.

[0021] Further, the basalt fiber is grafted by gamma-glycidoxypropyltrimethoxysilane with the -Si-O- exposed after hydrochloric acid erosion on the surface of the basalt fiber, the surface of the basalt fiber is connected with the coupling agent to form a film, the magnetic nano powder is attached to the surface of the modified film, and a layer of modified film is covered again, so that the magnetic nano powder becomes the middle of the sandwich film layer, creates conditions for current control of the directional arrangement of the basalt fiber, and the outermost modified film is bonded and fixed at high temperature after the basalt fiber is arranged in a direction, becomes a complete basalt fiber filament, realizes the linear distribution of the basalt fiber, and thus can conveniently replace the steel bar. The way of connecting the basalt fiber into a filament has the advantages of low cost and controllability, and has obvious directness in replacing the steel bar. Compared with the previous invention patent, the direct use of the basalt fiber filament cannot be fixed, cannot be uniformly dispersed, has a large use amount, and has poor economy, and has a fundamental difference. The basalt fiber is the best way to be widely used in the building material industry, is uniform, does not additionally increase a mold related mechanism and a corresponding process, and ensures the quality of the building material product.

[0022] Based on the above technical solution, the embodiment of the present application can at least produce the following technical effects: (1) The basalt fiber reinforced autoclaved concrete slab and the production process thereof provided by the present application can significantly reduce the modification cost of the production line without changing the existing production process.

[0023] (2) The basalt fiber reinforced autoclaved concrete slab and the production process thereof provided by the present application change the defect that it is difficult to install and arrange rod-shaped or filament basalt fiber in a mold, and use the automatic connection technology of short fiber to achieve the same effect as using long filaments.

[0024] (3) The basalt fiber reinforced autoclaved concrete slab and the production process thereof provided by the present application change the defect that the use of short filaments cannot achieve the use effect, and realize automatic control and directional arrangement of basalt fiber. In the previous technology, the purpose of random distribution is achieved by grinding basalt fiber, and the basalt fiber cannot effectively replace the steel mesh. However, the present application simulates the replacement of the steel mesh by directional distribution of the basalt fiber, has the advantages of clear material stress and simple replacement, and is the best way to realize material replacement.

[0025] (4) The basalt fiber reinforced autoclaved concrete slab and the production process thereof provided by the present application do not increase additional processes and do not reduce production efficiency, significantly reduce the production cost of autoclaved aerated concrete, reduce the thermal conductivity of the slab, make the slab gas more uniform, and have more excellent heat preservation and insulation performance.

[0026] (5) The basalt fiber reinforced autoclaved concrete slab and the production process thereof provided by the application use simple materials and can effectively promote the technical progress of basalt fiber used in building composite materials in an alkali environment. DETAILED DESCRIPTION

[0027] Various exemplary embodiments of the present application will now be described in detail, which should not be considered as limiting the present application, but rather as a description of certain aspects, features and embodiments of the present application.

[0028] It should be understood that the terms used in the present application merely describe particular embodiments and are not intended to limit the present application. In addition, for numerical ranges in the present application, it should be understood that each intermediate value between the upper limit and the lower limit of the range is also specifically disclosed. Each smaller range within the larger range, both the upper limit and the lower limit of which are included or excluded, is also included in the present application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application pertains. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present application, preferred methods and materials are described. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials in connection with which the documents are cited. In case of conflict between the content of the specification and that of any document incorporated by reference, the content of the specification prevails.

[0030] Various modifications and changes can be made to the specific implementation of the present application described in this specification without departing from the scope or spirit of the application. Other implementations of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The specification and examples given are exemplary only.

[0031] As used herein, the terms "comprise", "comprising", "include", "including", "have", "having" and the like are open-ended terms that are intended to mean including, but not limited to.

[0032] The ordinary portland cement used in the present application has a carbon emission of not more than 665 kg / t, a clinker addition amount of less than 75%, a lithium slag addition amount of greater than 20%, and a steel slag usage amount of greater than 5%; while the ordinary cement clinker addition amount is greater than 80%, lithium slag and steel slag cannot be added, and the carbon emission is higher than 800 kg / t.

[0033] Example 1 Preparation of modified basalt fiber: S1, respectively weighing basalt fiber 40 parts, magnetic nano Fe3O4 powder 5 parts, solid polyamide resin powder 20 parts, γ-glycidyl ether propyl trimethoxysilane 10 parts, polyether polyol 2 parts, film forming aid EC-5 2 parts, propylene glycol methyl ether 2 parts, emulsifier EZ4528 4 parts, lubricant polyoxyethylene alkyl phenol ether 4 parts, dodecyl dimethyl betaine 1 part, deionized water 60 parts, diameter Φ8μm, length 9mm~12mm.

[0034] S2, the diameter Φ8μm basalt fiber filament each 0.5~0.6kg bundle, the end of the immersion in the solubility of 1.0mol / L hydrochloric acid, the immersion depth is 0.5~1mm, soaking time is 10~20min, on the electric cutting machine in a bundle of cutting into 9~12mm long, then reverse direction, the other end of the same immersion concentration of 0.8~1.2mol / L concentrated hydrochloric acid 10~20min, the immersion depth is 0.5~1mm.

[0035] S3, the basalt fiber after two end infiltration of the bundle of dispersion, cooling 1~2h, standby.

[0036] S4, the particle size of about 100nm magnetic nano Fe3O4 particles using JM-120 type colloidal mill dispersion in deionized water, the pH value is adjusted to 5~6, then add water quality 1%~2% of the surface modifier γ-glycidyl ether propyl trimethoxysilane, high speed stirring at 90℃ for 2h. After treatment of magnetic particles centrifugal separation, washing, repeated operation 3~4 times, drying, standby.

[0037] S5, according to the slurry concentration 0.1%~0.2% weighing S4 step standby magnetic nano Fe3O4 particles with 20~25 times of deionized water ultrasonic dispersion, under the condition of stirring speed 550r / min, adding polyamide resin, continue to high speed stirring 2~3h. Heating to 100℃, melt stirring 40min.

[0038] S6, cooling to 95℃, adding bath agent propylene glycol methyl ether (PM), fully stirring 15min, adding emulsifier EZ4528, keep the temperature higher than 60℃, fully high speed stirring 335min. Cooling to 60℃, add 300ml temperature is 45℃ warm water, and in more than 1500r / min high speed dispersion stirring 10min.

[0039] S7, again drop S6 step solution total mass one third temperature is 40℃ warm water, and in more than 1500r / min high speed dispersion stirring 20min. At the same time, adding 5g~10g film forming aid EC-5.

[0040] S8, quickly drop the total mass of one-third of the solution of step S6 into 25℃ normal temperature water. Stir at 600r / min for 30min to homogenize and disperse.

[0041] S9, add 25mL of lubricant polyoxyethylene alkyl phenol ether and dodecyl dimethyl betaine with a concentration of 15g / L in sequence, continue stirring for 3h, and obtain white and uniform basalt continuous fiber infiltrant for standby.

[0042] S10, add the basalt fiber in step S3 into the infiltrant, heat to a temperature of 33℃, ultrasonic dispersion, take out, and dry at 27℃ under the condition of wind speed of 0.8m / s to obtain modified basalt fiber for standby.

[0043] Autoclaved aerated concrete slurry preparation: S11, take 300 parts of ordinary Portland cement, 200 parts of quicklime, 200 parts of carbide slag, 300 parts of high calcium fly ash with CaO content higher than 10%, 410 parts of broken marble powder with SiO2 content of 50%~60%, 200 parts of biomass ash with K2O content greater than 6%, 200 parts of slag, 100 parts of granulated blast furnace slag, and 5 parts of phosphogypsum.

[0044] S12, first crush the marble scrap to a particle size of less than 20mm, add the slag, granulated blast furnace slag, and phosphogypsum in proportion, mix uniformly, and then send into the ball mill. Add 65% of the total mass of the above-mentioned materials of tap water with a temperature of 30~35℃, grind to a material fineness of 200 mesh with a residue of less than 40%, and add water by 50% to obtain a standby high-temperature slurry, which is stored in a φ10m×6m slurry tank for standby for more than 8h.

[0045] S13, take 2000kg of the stirred slurry, add a certain proportion of cement, lime, biomass ash, and carbide slag into the slurry, add 0.8% of the total mass of the metal aluminum powder, and stir at a speed of 550r / min for 2~3min, and then pour into a 6m×1.5m×0.8m mold frame.

[0046] S14, add 1.2% of the mass of the material of the modified basalt fiber in step S10.

[0047] S15, move the mold frame and the material to the lower part of the rectangular electromagnet within 5min. The length of the rectangular electromagnet is parallel to the width of the mold frame, which is 0.9m~1.0m. Change the current size to control the magnetic intensity of the electromagnet to be 1.5~3T. Keep the initial rectangular electromagnet at the upper part of the mold for 20cm~50cm.

[0048] S16, push the mold through the rectangular electromagnet at a speed of 0.5~1m / s to ensure that the basalt fiber moves freely according to the direction of the magnetic force line.

[0049] S17, add 80 kg of modified infiltrant 80 kg in S9 step in the mold, adjust the temperature to 55℃, and make the basalt fibers with the ends contacting each other cured in the reaction of the modified lubricant.

[0050] Preparation of autoclaved aerated concrete board: S18, place the mold in a room with a temperature of 60℃, seal the periphery, and remove the mold after 160 min of static standing.

[0051] S19, when the green body strength reaches 0.4-0.5 MPa, remove the periphery of the mold, assemble the mold and return it to the pouring area, and brush the release agent for standby. After the green body is cut according to the specified size, it is sent to the pre-incubation chamber.

[0052] S20, after the green body stays in the pre-incubation chamber at a temperature of 80℃ for 2-3 h, it is sent to high-temperature steam curing at a temperature of 200℃ and a pressure of 1.2 MPa for 7 h, to obtain the product, autoclaved aerated concrete board.

[0053] The absolute dry compressive strength of the board is 4.2 MPa, the dry density is 557 kg / m3, the thermal conductivity is 0.12 W / (m·K), the dry shrinkage rate is 0.4 mm / m, the single-point hanging force of the board reaches 1550 N, and the impact resistance performance reaches 10 times, which exceeds the performance of the board using steel mesh and is also significantly higher than the past patent using basalt filaments, which has a board hanging force of only 1000 N and an impact resistance performance of only 5 times.

[0054] Example 2 Preparation of modified basalt fibers: S1, respectively weigh 30 parts of basalt fibers with a diameter of Φ8 μm and a length of 9-12 mm, 2 parts of magnetic nano Fe3O4 powder, 10 parts of solid polyamide resin powder, 5 parts of γ-glycidyl ether oxypropyl trimethoxysilane, 1 part of polyether polyol, 1 part of film-forming aid EC-5, 1 part of propylene glycol methyl ether, 3 parts of emulsifier EZ4528, 3 parts of lubricant polyoxyethylene alkyl phenol ether, 0.5 parts of dodecyl dimethyl betaine, and 50 parts of deionized water.

[0055] S2, bundle the basalt fiber filaments with a diameter of Φ8 μm at 0.5-0.6 kg per bundle, immerse the ends in hydrochloric acid with a solubility of 1.0 mol / L, with an immersion depth of 0.5-1 mm and an immersion time of 10-20 min, cut the filaments into 9-12 mm long on the electric cutting machine, then reverse the direction, and immerse the other end in concentrated hydrochloric acid with a concentration of 0.8-1.2 mol / L for 10-20 min, with an immersion depth of 0.5-1 mm.

[0056] S3, the basalt fiber with both ends infiltrated was bundled and then cooled for 1-2 hours for standby.

[0057] S4, magnetic nano Fe3O4 particles with a particle size of about 100 nm were dispersed in deionized water using a JM-120 colloidal mill, the pH value was adjusted to 5-6, then a surface modifier γ-glycidoxypropyltrimethoxysilane with a water mass fraction of 1%-2% was added, and high-speed stirring was carried out at 90°C for 2 hours. After treatment, the magnetic particles were centrifuged, washed with water, and repeated 3-4 times, and then dried for standby.

[0058] S5, the magnetic nano Fe3O4 particles prepared in step S4 were ultrasonically dispersed in 20-25 times of deionized water with a slurry concentration of 0.1%-0.2%, and then polyamide resin was added under the condition of a stirring speed of 550 r / min, and high-speed stirring was continued for 2-3 hours. Heating to 100°C, melting and stirring for 40 minutes.

[0059] S6, the temperature was lowered to 95°C, propylene glycol methyl ether (PM) was added as a co-bath agent, and stirring was carried out for 15 minutes, then emulsifier EZ4528 was added, the temperature was kept above 60°C, and high-speed stirring was carried out for 335 minutes. After the temperature was lowered to 65°C, 300 ml of warm water with a temperature of 45°C was added, and stirring was carried out at a high speed of greater than 1500 r / min for 10 minutes.

[0060] S7, one-third of the total mass of the solution in step S6 was added dropwise at a temperature of 40°C, and stirring was carried out at a high speed of greater than 1500 r / min for 20 minutes. At the same time, 5-10 g of film-forming aid EC-5 was added.

[0061] S8, one-third of the total mass of the solution in step S6 was added dropwise at room temperature, and stirring was carried out at a speed of 600 r / min for 30 minutes.

[0062] S9, 30 mL of lubricant polyoxyethylene alkyl phenol ether and dodecyl dimethyl betaine with a concentration of 15 g / L were added in sequence, and stirring was continued for 3 hours, to obtain white and uniform basalt continuous fiber infiltrant for standby.

[0063] S10, basalt fiber in step S3 was added into the infiltrant, heated to a temperature of 33°C, ultrasonically dispersed, then taken out, and dried at a wind speed of 0.8 m / s at 27°C, to obtain modified basalt fiber for standby.

[0064] Autoclaved aerated concrete slurry preparation: S11, take 200 parts of ordinary Portland cement, 100 parts of lime, 100 parts of carbide slag, 200 parts of high calcium fly ash with CaO content higher than 10%, 210 parts of crushed marble powder with SiO2 content of 50%~60%, 150 parts of biomass ash with K2O content greater than 6%, 150 parts of slag, 50 parts of granulated blast furnace slag, 3 parts of phosphogypsum.

[0065] S12, first crush the marble scrap to a particle size of less than 20 mm, add slag, granulated blast furnace slag, phosphogypsum in proportion, mix uniformly, then send into the ball mill, add 60% of the total mass of the above-mentioned materials of 30~35℃ tap water, grind to a fineness of 200 mesh with a residue of less than 40%, add water to 40%, get ready-to-use high-temperature slurry, store in φ10m×6m slurry tank, stand for more than 8h, standby.

[0066] S13, take 1500kg of stirred slurry, add a certain proportion of cement, lime, biomass ash, carbide slag, add 0.6% of the total mass of the material of aluminum powder, stir at a speed of 550r / min for 2~3min, then pour into a 6m×1.5m×0.8m mold frame.

[0067] S14, add 1.2% of the mass of the material in S10 to the modified basalt fiber.

[0068] S15, move the mold and material to the lower part of the rectangular electromagnet within 5min, the length of the rectangular electromagnet parallel to the width of the mold is 0.9m~1.0m. Change the current size to control the magnetic intensity of the electromagnet to 1.5~3T. Keep the initial rectangular electromagnet at the upper 20cm~50cm of the mold.

[0069] S16, push the mold through the rectangular electromagnet at a speed of 0.5~1m / s to ensure that the basalt fiber moves freely according to the direction of the magnetic force line.

[0070] S17, add 50kg of modified wetting agent in S9 to the mold, adjust the temperature to 55℃, and make the basalt fibers at both ends contact each other solidify in the reaction of the modified lubricant.

[0071] Preparation of autoclaved aerated concrete board: S18, place the mold in a room with a temperature of 60℃, seal the four sides, and remove the mold after 160min.

[0072] S19, when the green body strength reaches 0.4~0.5MPa, remove the mold, assemble the mold and return to the pouring area, brush the release agent for standby. Cut the green body according to the specified size and send it to the pre-incubation chamber.

[0073] S20, the green body is sent into high-temperature steam curing at a temperature of 200 DEG C and a pressure of 1.2 MPa for 7 h after staying in a pre-curing chamber for 2-3 h at a temperature of 80 DEG C, and an autoclaved aerated concrete plate is obtained.

[0074] The absolute dry compressive strength of the plate is 4.1 MPa, the dry density is 560 kg / m3, the thermal conductivity is 0.11 W / (m·K), the dry shrinkage rate is 0.4 mm / m, the single-point hanging force of the plate reaches 1560 N, and the impact resistance performance reaches 11 times, which is higher than the performance of the plate using a steel mesh and is also significantly higher than the situation that the hanging force of the plate using basalt filaments in the past patent is only 1000 N and the impact resistance performance is only 5 times.

[0075] The above only describes the preferred embodiments of the present application, and it should be noted that, for those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A basalt fiber reinforced autoclaved concrete panel, characterized in that, The composition comprises the following components by weight: 200-300 parts of ordinary silicate low-carbon cement, 100-200 parts of quicklime, 100-200 parts of carbide slag, 200-300 parts of high-calcium fly ash, 210-410 parts of crushed marble powder, 150-200 parts of biomass ash, 150-200 parts of slag, 50-100 parts of granulated blast furnace slag, 3-5 parts of phosphogypsum, and 60%-65% of water based on the total mass of the above materials, 0.6%-0.8% of aluminum powder based on the total mass of the materials including water, and 0.7%-1.2% of modified basalt fiber based on the total mass of the materials including the aluminum powder; the modified basalt fiber comprises the following components by weight: 30-40 parts of basalt fiber, 2-5 parts of magnetic nano Fe3O4 powder, 10-20 parts of solid polyamide resin powder, 5-10 parts of gamma-glycidoxypropyltrimethoxysilane, 1-2 parts of polyether polyol, 1-2 parts of film-forming aid EC-5, 1-2 parts of propylene glycol methyl ether, 3-4 parts of emulsifier EZ4528, 3-4 parts of lubricant polyoxyethylene alkyl phenol ether, 0.5-1 part of dodecyl dimethyl betaine, and 50-60 parts of deionized water.

2. The basalt fiber reinforced autoclaved concrete panel according to claim 1, characterized in that, The high-calcium fly ash has a CaO content higher than 10%, the crushed marble powder has a SiO2 content of 50%-60%, and the biomass ash has a K2O content greater than 6%.

3. The basalt fiber reinforced autoclaved concrete panel according to claim 1, characterized in that, The modified basalt fiber is prepared by the following steps: A1, bundle the basalt fiber, and immerse the two ends in 0.5-1.5 mol / L hydrochloric acid with a depth of 0.5-1 mm for 10-20 min, then disperse the bundle, cool for 1-2 h, and reserve; A2, disperse the magnetic nano Fe3O4 powder in deionized water using a JM-120 colloidal mill, adjust the pH value to 5-6, then add 1%-2% of the water mass of surface modifier gamma-glycidoxypropyltrimethoxysilane, stir at a high speed for 2-3 h at 88-90°C, centrifuge and wash the magnetic particles after treatment, repeat the operation 3-4 times, dry, and reserve; A3, weigh the magnetic nano Fe3O4 particles reserved in step A2 at a slurry concentration of 0.1%-0.2%, disperse in 20-25 times of deionized water under ultrasonic, add the solid polyamide resin powder under the condition of a stirring speed of 500-600 r / min, continue to stir at a high speed for 2-3 h, heat to 90-120°C, and stir for 30-40 min after melting; A4, cooling to 90~100℃, adding co-bath propylene glycol methyl ether, fully stirred 10~20min, adding emulsifier EZ4528, keep temperature above 60℃, fully high speed stirring 30~40min, cooling to 55-65℃, adding temperature is 40~50℃ warm water, and in greater than 1500r / min high speed dispersion stirring 10min; again drop 1 / 3 temperature is 30~40℃ warm water, and in greater than 1500r / min high speed dispersion stirring 20min, while adding film forming agent EC-5; fast drop 1 / 3 temperature is 20~30℃ normal temperature water, stirring 30min homogenization dispersion at 500~800r / min speed; A5, adding lubricant polyoxyethylene alkyl phenol ether and dodecyl dimethyl betaine in turn, continue stirring 2~3h, get white uniform basalt continuous fiber infiltrant, standby; in basalt continuous fiber infiltrant adding basalt fiber in step A1, heating to temperature is 30~35℃, ultrasonic dispersion, take out, dry in the condition of 25~30℃ wind speed 0.5~1m / s, get modified basalt fiber.

4. Process for the production of basalt fiber reinforced autoclaved concrete panels according to any one of claims 1-3, characterized in that, Including the following steps: S1, basalt fiber reinforced autoclaved concrete paste preparation; S2, basalt fiber reinforced autoclaved aerated concrete board preparation.

5. The process for the production of basalt fiber reinforced autoclaved concrete panels according to claim 4, characterized in that, The S1 includes the following sub-steps: S11, according to the proportion of raw materials, the marble, slag, granulated blast furnace slag, phosphor gypsum mixed uniformly after crushing to particle size less than 20mm, send into the ball mill, add 60%~65% of the total mass of the material temperature is 30~35℃ tap water, grinding to material fineness 200 mesh residue less than 40%, adding water amount is 40%~50%, get ready to use high temperature slurry, stored in slurry tank, standing for more than 8h, standby; S12, weighing the mixed slurry, adding a certain proportion of cement, lime, biomass ash, carbide slag, adding 0.6%~0.8% of the total mass of the material aluminum powder, stirring at 500r / min~600r / min speed for 2~3min, get the basalt fiber reinforced autoclaved concrete paste needed to be injected into the mold.

6. The process for the production of basalt fiber reinforced autoclaved concrete panels according to claim 4, characterized in that, The S2 includes the following sub-steps: S21, the basalt fiber reinforced autoclaved concrete paste is injected into the mold, adding 0.7%~1.2% of the modified basalt fiber, pushing the mold through the rectangular electromagnet at a speed of 0.5~1m / s, adding modified infiltrant in the mold, adjusting the temperature to 50~60℃; S22, the mold is placed in a room with a temperature of 50℃~70℃, and the surrounding is sealed, and the mold is removed after standing for 120min~180min; S23, after demolding, the blank is placed in the pre-incubation room at a temperature of 70~85℃ for 2~3h, and then sent to the high temperature autoclave at a temperature of 180~200℃ and a pressure of 1.0~1.2MPa for 6~8h, to get the product autoclaved aerated concrete board.