CN117550844B - Continuously extrusion molded ultrahigh-performance cement-based tile and preparation process thereof - Google Patents
Continuously extrusion molded ultrahigh-performance cement-based tile and preparation process thereof Download PDFInfo
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- CN117550844B CN117550844B CN202311854737.5A CN202311854737A CN117550844B CN 117550844 B CN117550844 B CN 117550844B CN 202311854737 A CN202311854737 A CN 202311854737A CN 117550844 B CN117550844 B CN 117550844B
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- 239000004568 cement Substances 0.000 title claims abstract description 82
- 238000001125 extrusion Methods 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000004576 sand Substances 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 239000002131 composite material Substances 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 17
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 17
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 16
- 239000011707 mineral Substances 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 16
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 claims abstract description 14
- 239000011325 microbead Substances 0.000 claims abstract description 14
- 239000011347 resin Substances 0.000 claims abstract description 14
- 229920005989 resin Polymers 0.000 claims abstract description 14
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000012986 modification Methods 0.000 claims abstract description 11
- 230000004048 modification Effects 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 9
- 238000000498 ball milling Methods 0.000 claims description 8
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 239000007822 coupling agent Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- HXOGQBSDPSMHJK-UHFFFAOYSA-N triethoxy(6-methylheptyl)silane Chemical group CCO[Si](OCC)(OCC)CCCCCC(C)C HXOGQBSDPSMHJK-UHFFFAOYSA-N 0.000 claims description 3
- BFXIKLCIZHOAAZ-UHFFFAOYSA-N methyltrimethoxysilane Chemical compound CO[Si](C)(OC)OC BFXIKLCIZHOAAZ-UHFFFAOYSA-N 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims 2
- 229910052681 coesite Inorganic materials 0.000 claims 1
- 229910052906 cristobalite Inorganic materials 0.000 claims 1
- 239000004005 microsphere Substances 0.000 claims 1
- 239000003469 silicate cement Substances 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 229910052682 stishovite Inorganic materials 0.000 claims 1
- 229910052905 tridymite Inorganic materials 0.000 claims 1
- 239000011374 ultra-high-performance concrete Substances 0.000 abstract description 12
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005520 cutting process Methods 0.000 description 19
- 238000000034 method Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 239000002250 absorbent Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 2
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007580 dry-mixing Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an ultra-high performance cement-based tile formed by continuous extrusion, which takes cement, silica fume, mineral powder, fly ash microbeads, modified machine-made sand, steel fibers, composite modified components, a water reducing agent, a shrinkage compensating component, cellulose ether and water as main raw materials; the composite modified component comprises nano magnesium aluminum silicate, graphite powder and high-molecular water-absorbing resin; the modified machine-made sand is ball-milled, screened and hydrophobically modified machine-made sand. The invention applies the ultra-high performance concrete formula system to the preparation of the ultra-cement-based tile, combines modification means such as cellulose ether, modified machine-made sand, composite modification components, shrinkage compensation components and the like, effectively improves the mechanical property, durability and the like of the obtained cement-based tile on the premise of ensuring the continuous extrusion molding effect, is beneficial to improving the production efficiency, and can provide a new thought for the preparation of the high-performance and large-size cement-based tile.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an ultra-high performance cement-based tile formed by continuous extrusion and a preparation process thereof.
Background
Conventional cement-based tiles are generally produced by press filtration, compression molding or extrusion, but have various problems such as: the materials are single in type (basically cement, sand, water and glass fiber), so that the mechanical property and durability of the tile are poor; the traditional fiber cement-based tiles, asbestos tiles and the like have been gradually replaced by color steel tiles due to the general bearing capacity and durability. Meanwhile, cement tiles produced by adopting the traditional mould pressing method and extrusion method are limited by materials and equipment, and the produced tiles are small tiles and are mainly used for roof decoration, heat insulation and heat preservation of civil buildings, cannot be used in large areas in the fields of industrial plants and the like, and cannot replace color steel tiles. Compared with the conventional color steel tile, resin tile and the like in the factory building, the cement tile has good corrosion resistance, weather resistance and the like, and can perfectly replace the conventional color steel tile and prolong the service life of a roof structure if the novel cement tile with high bearing capacity, excellent durability and large single-piece area can be produced.
The ultra-high performance concrete is a novel building material which does not contain coarse aggregate and is simultaneously doped with steel fibers. If the ultra-high performance concrete material can be combined with an extrusion molding process to carry out material modification optimization and process matching design, the method is used for producing the extrusion molding cement-based tile, and has great market potential. However, ultra-high performance concrete is a large fluid material and is not usually extruded. Therefore, the key problems to be solved in preparing the continuously extrusion molded ultrahigh-performance cement-based tile include smooth extrusion of tile products while ensuring ultrahigh strength, durability and preparation efficiency.
Disclosure of Invention
The invention mainly aims to provide an ultra-high performance cement-based tile formed by continuous extrusion, which solves the problems that the existing cement tile has low strength, small area, low production efficiency, and the like, and cannot be used for replacing color steel tiles in the industrial field in a large-scale manner.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The continuously extrusion molded ultrahigh-performance cement-based tile comprises the following raw materials in parts by weight: 650-800 parts of cement, 160-200 parts of silica fume, 100-130 parts of mineral powder, 60-100 parts of fly ash microbeads, 1000 parts of modified machine-made sand, 120-150 parts of steel fiber, 4-9 parts of composite modified components, 3-6 parts of water reducer, 20-30 parts of shrinkage compensation components, 2-6 parts of cellulose ether and 180-230 parts of water; the composite modified component comprises nano magnesium aluminum silicate, graphite powder and high-molecular water-absorbing resin; the modified machine-made sand is ball-milled, screened and hydrophobically modified machine-made sand.
In the scheme, the mass ratio of the nano magnesium aluminum silicate to the graphite powder to the high molecular water-absorbing resin is 1:0.3-0.7:0.3-0.8.
Further, the purity of the nano magnesium aluminum silicate is more than 90%, and the particle size is 10-50nm; the particle size of the graphite powder is 10-20 mu m; the particle size of the high molecular water-absorbing resin is 40-80 mu m, and the water absorption multiple is 100-400 times.
In the scheme, the hydrophobic modification step adopts silane coupling agent solution to soak the machine-made sand (18-24 h). In the above scheme, the concentration of the silane coupling agent solution is 8-12wt%.
In the above scheme, the silane coupling agent may be one or more of isooctyltriethoxysilane coupling agent, methyltrimethoxysilane, etc.
In the scheme, the modification machine-made sand ball milling process comprises the following steps: the raw machine-made sand is screened out to remove aggregate with particle size below 70 meshes, and ball milling is carried out for 40-80s at ball milling speed of 50-70 r/min.
In the scheme, the screening step is to screen out granules with the particle size of 20-70 meshes.
In the above scheme, each component in the shrinkage compensation component and the weight part thereof comprise: 8-12 parts of sulphoaluminate clinker and 4-5 parts of magnesium oxide.
In the scheme, the cement is Portland cement, and specifically PII 52.5 or PO 52.5 Portland cement and the like can be selected.
In the scheme, the content of SiO 2 in the silica fume is more than or equal to 96%, and the 28d activity index is more than or equal to 110%.
In the scheme, the 28d activity index of the mineral powder is more than or equal to 105%.
In the scheme, the water demand ratio of the fly ash microbeads is less than or equal to 95%, the 28d activity index is more than or equal to 96%, and the glass body content is more than or equal to 90%.
In the scheme, the length of the steel fiber is 5-6mm, and the diameter is 0.1-0.12mm.
In the scheme, the water reducer is a polycarboxylic acid high-efficiency water reducer, and the water reducing rate is 25-30%.
In the above scheme, the cellulose ether is hydroxyethyl cellulose ether.
The preparation process of the continuously extrusion molded ultrahigh-performance cement-based tile comprises the following steps of:
1) Mixing: adding the modified component into part of water to obtain a mixture A, dry-mixing other raw materials except water, adding the rest water and the mixture A, and stirring to obtain a blank;
2) Extrusion: extruding the obtained blank into a tile die by adopting a vacuum screw extruder, and cutting;
3) Curing: and (3) carrying out steam curing on the tile blank with the tile mould, and demoulding to obtain the ultra-high-performance cement-based tile.
In the scheme, water accounting for 30-40% of the total consumption is firstly added in the step 1).
In the scheme, the dry mixing time is 3-5min.
In the scheme, the stirring treatment time is 10-20min.
In the scheme, the extrusion process adopts vacuum twin-screw extrusion, the extrusion pressure is 3-6MPa, the vacuum degree is 10 -2-10-5 Pa, and the extrusion rate is 500-1000mm/min.
Further, the temperature of the steam curing is 60-90 ℃ and the time is 36-60h.
Further, the ultra-high performance cement-based tile is subjected to coloring treatment according to the use requirement.
In the above aspect, in the cutting step: the running speed of the tile die is consistent with the extrusion speed of the blank, when an infrared sensing device (7) arranged on a cutting machine (6) senses the front end of the tile die, the synchronous cutting machine (6) is started to cut the tile die, the cutting machine is consistent with the speed of the tile die along the direction of a conveying belt, and meanwhile, the cutting machine is cut at a constant speed perpendicular to the direction of the conveying belt (along the width direction of the tile die), and after the cutting is finished, the cutting machine moves reversely along the conveying belt and is reset to the right opposite side of the original position (along the width direction of the tile die); thus, the reciprocating cutting is performed. By adopting the cutting steps, the cutting quality of the cement tile product can be effectively ensured on the basis of ensuring continuous extrusion processing.
The invention adopts the technical principle that:
1) The invention utilizes the characteristics of high durability and high strength of the ultra-high performance concrete, and can fully exert the high strength and high toughness of the material when being applied to the preparation of the cement-based tile, widen the application scene of the ultra-high performance concrete, and effectively improve the bearing capacity, durability and the like of the cement-based tile. But the ultra-high performance concrete is a large fluid material and cannot be extruded and shaped. In order to solve the technical problems, the cellulose ether is added firstly, so that the viscosity of the slurry can be effectively improved, the slurry has certain plasticity, but the slurry cannot be extruded smoothly due to the increased viscosity and thinner extrusion opening thickness of the tile blank; the composite modified component is further introduced, wherein the water-absorbent resin is subjected to pre-water absorption treatment in the process of mixing materials, the free water of the water-absorbent resin release part can be promoted by utilizing the extrusion pressure and the vacuum environment effect in the extrusion process of the blank on the basis of ensuring the working performance of the mixture, a water film is formed between the surfaces of particles such as cement and the like, a good lubricating effect is exerted between the particles, meanwhile, the friction resistance in the extrusion process between the particles such as cement, silica fume and the like is further reduced by combining graphite powder, and the obtained blank is smoothly extruded from a waveform extrusion port through the synergistic effect of the two. In addition, as the prepared tile is of a cement-based ultrathin structure, deformation is easy to occur after the tile is put into a mold by adopting a conventional means, the nano magnesium aluminum silicate is further introduced, and the three-dimensional network structure of the nano magnesium aluminum silicate can provide skeleton support at the nano-micron level, so that the thickness uniformity and the square size of the tile are further ensured, and the defects of deformation, mold collapse and the like are prevented.
2) In the aspect of aggregate, in order to reduce the material cost of the cement-based tile, machine-made sand is introduced as aggregate, but the machine-made sand is used as artificial crushing sand, and the surface is mostly in a rough form of edges and corners, so that the friction coefficient between the aggregate and cement particles is increased; in order to reduce friction resistance, ball milling pretreatment is carried out on the machine-made sand, so that the roughness of the surface of the machine-made sand is reduced, and meanwhile, after the silane coupling agent is adopted for soaking treatment, a layer of hydrophobic film is formed on the surface of the machine-made sand.
3) Because the conventional ultra-high-performance concrete adopts a large amount of cementing material, the cement tile prepared by the method belongs to an ultra-thin structure, shrinkage cracking and the like are easy to occur, and the shrinkage compensation component can exert shrinkage compensation effects at different periods in the early stage and the later stage, so that the cracking risk of the tile is reduced.
4) In terms of process, the invention abandons the conventional extrusion process thought, and synchronously operates the tile die and the extruded tile blank, and the cutting device is provided with a transverse and longitudinal synchronous operation mechanism, so that the tile blank of the production line can be cut synchronously and with high quality under the condition of not stopping operation.
According to the invention, by introducing the design thought of the ultra-high performance concrete material, compared with the traditional cement-based tile, cement, silica fume, mineral powder and other high-activity cementing materials, the matrix strength can be greatly improved under the condition of low water consumption, and the cement-based tile with the thickness of 5-7mm and the width of 800-1000mm can be continuously produced by adopting an extrusion method; meanwhile, the toughness of the tile can be effectively improved, and the length of the obtained ultra-high-performance cement-based tile can reach 5m at maximum.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the invention, the ultra-high-performance concrete is applied to the preparation of the ultra-cement-based tile for the first time, and the modification means such as cellulose ether, modified machine-made sand, composite modification components, shrinkage compensation components and the like are combined, so that the high-efficiency continuous extrusion molding of the ultra-high-performance concrete can be realized, a new idea can be provided for the preparation of the high-performance cement-based tile, and the application field of the ultra-high-performance concrete can be effectively widened;
2) On the premise of ensuring the continuous extrusion molding effect, the mechanical property, the durability and the like of the obtained cement-based tile can be effectively improved, and the cement-based tile with a larger monolithic area can be prepared efficiently; the product can be widely used for replacing the existing products such as color steel tiles, resin tiles and the like in the industrial building field and the civil field, and the service life of the roof structure is effectively prolonged;
3) The preparation method is simple, can effectively improve the production efficiency of the cement-based tile, and is suitable for popularization and application. .
Drawings
FIG. 1 is a schematic view of an extrusion apparatus employed in the present invention;
In the figure, 1 is an extrusion type conical hopper, 2 is a vacuum screw extruder, 3 is a waveform extrusion port, 4 is a transition conveying device, 5 is a watt die, 6 is a cutting machine, and 7 is an infrared sensing device.
FIG. 2 is a physical view of the ultra-high performance cement-based tile obtained in the example.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the following examples, the cement used was PII 52.5 cement; silica fume SiO 2 content 96%,28d activity index 110%; the mineral powder is grade S105, and the 28d activity index is 110%; the water demand ratio of the fly ash microbeads is 93%, the 28d activity index is 98%, and the glass content is 92%. The length of the steel fiber is 5-6mm, and the diameter is 0.1-0.12mm; the water reducer is a polycarboxylic acid high-efficiency water reducer, and the water reducing rate is 26%; the cellulose ether is hydroxyethyl cellulose ether;
the preparation method of the modified machine-made sand comprises the following steps: the method comprises the steps of screening out aggregate with particle size below 70 meshes from raw machine-made sand, placing the aggregate on a ball mill, wherein the ball milling speed is 60r/min, the time is 60s, screening out particle size of 20-70 meshes, placing the aggregate in 10wt% concentration isooctyl triethoxysilane coupling agent, soaking for 24h, and drying at 60 ℃ to obtain modified machine-made sand; wherein, the original state machine-made sand is provided by a Huaxin cement hundred million ton line machine-made sand project, the parent rock is limestone, the fineness modulus is 2.5, and the crushing value is 10%.
The shrinkage compensation component consists of 10 parts of sulphoaluminate clinker and 4 parts of magnesium oxide; the composite modified component consists of 1 part of high-purity nano magnesium aluminum silicate, 0.5 part of graphite powder and 0.7 part of high-molecular water-absorbent resin; wherein the high molecular water-absorbing resin is provided by Guangzhou chemical industry Co., ltd, has a particle size of 40-60 μm and has a water absorption multiple of 150 times.
Example 1
The raw materials of the continuously extrusion-molded ultrahigh-performance cement-based tile comprise cement, silica fume, mineral powder, fly ash microbeads, ceramic sand, modified machine-made sand, steel fibers, nano modified components, a water reducing agent, a shrinkage compensating component and cellulose ether; the specific preparation process is as follows:
1) Weighing the raw materials in proportion; the raw materials and the parts by weight thereof are as follows: 700 parts of cement, 160 parts of silica fume, 120 parts of mineral powder, 80 parts of fly ash microbeads, 1000 parts of modified machine-made sand, 150 parts of steel fiber, 6 parts of composite modified components, 4 parts of water reducer, 22 parts of shrinkage compensating components, 2 parts of cellulose ether and 185 parts of water;
2) Stirring: and (3) putting the modified component into 40% of water to be weighed and dispersed in advance to obtain a mixture A, weighing other needed raw materials, pouring the raw materials into a stirrer to dry-mix for 5min, adding the rest water and the mixture A, and stirring for 18min to obtain a blank required for manufacturing the tile.
3) Extrusion: pouring the blank into an extrusion type conical hopper (1), conveying the blank to a waveform extrusion port (3) through a vacuum screw extruder (2) to extrude the tile blank, and conveying the tile blank into a tile die (5) through a transition conveying device (4); wherein, the extruder adopts a vacuum double-screw extrusion process, the extrusion pressure is 4.0MPa, the vacuum degree is 10 - 3 Pa, and the extrusion speed is 700mm/min.
4) Cutting: the running speed of the tile die is consistent with the extrusion speed, when the infrared sensing device (7) senses the front end of the tile die, a synchronous cutting machine (6) is started to cut a tile blank, wherein the cutting machine is consistent with the speed of the tile die along the direction of a conveying belt (along the length direction of the tile die), and is simultaneously cut at a constant speed perpendicular to the direction of the conveying belt (along the width direction of the tile die), and after the cutting is finished, the cutting machine moves reversely along the conveying belt and is reset to the right opposite side of the original position; thus, the reciprocating cutting is performed.
5) Curing: and transferring the tile mould and the tile blank to a bracket, and conveying the tile mould and the tile blank to a steam curing chamber together for steam curing at 60 ℃ for 48 hours.
6) Demolding: and (3) taking out the tile blank from the tile mould by adopting a sucker after curing, and performing coloring treatment to obtain the finished product of the ultra-high performance cement-based tile (the physical diagram is shown in figure 2; the tile has a wave-shaped structure, the thickness is 6mm, and the width is 998 mm).
Example 2
The preparation method of the continuously extrusion molded ultrahigh-performance cement-based tile is approximately the same as that of the embodiment 1, and is characterized in that the raw materials and the parts by weight thereof are as follows: 750 parts of cement, 200 parts of silica fume, 110 parts of mineral powder, 90 parts of fly ash microbeads, 1000 parts of modified machine-made sand, 140 parts of steel fibers, 7 parts of composite modified components, 5 parts of water reducer, 24 parts of compensation shrinkage component, 3 parts of cellulose ether and 200 parts of water.
Example 3
The preparation method of the continuously extrusion molded ultrahigh-performance cement-based tile is approximately the same as that of the embodiment 1, and is characterized in that the raw materials and the parts by weight thereof are as follows: 800 parts of cement, 160 parts of silica fume, 100 parts of mineral powder, 100 parts of fly ash microbeads, 1000 parts of modified machine-made sand, 130 parts of steel fiber, 8 parts of composite modified components, 5 parts of water reducer, 26 parts of compensation shrinkage component, 5 parts of cellulose ether and 208 parts of water.
Comparative example 1
The preparation method of the cement-based tile is approximately the same as that of the embodiment 1, and the difference is that the raw materials and the parts by weight thereof are as follows: the raw materials are replaced by common raw materials of cement, sand and water, and the weight portions are as follows: 100 parts of PO42.5 cement, 120 parts of river sand and 35 parts of water.
Comparative example 2
The preparation method of the cement-based tile is approximately the same as that of the embodiment 1, and the difference is that the raw materials and the parts by weight thereof are as follows: 700 parts of cement, 160 parts of silica fume, 120 parts of mineral powder, 80 parts of fly ash microbeads, 1000 parts of modified machine-made sand, 150 parts of steel fiber, 4 parts of water reducer, 22 parts of shrinkage compensating component, 2 parts of cellulose ether and 185 parts of water.
Comparative example 3
The preparation method of the cement-based tile is approximately the same as that of the embodiment 1, and the difference is that the raw materials and the parts by weight thereof are as follows: 700 parts of cement, 160 parts of silica fume, 120 parts of mineral powder, 80 parts of fly ash microbeads, 1000 parts of machine-made sand, 150 parts of steel fibers, 6 parts of composite modified components, 4 parts of water reducing agent, 22 parts of shrinkage compensating component, 2 parts of cellulose ether and 185 parts of water; wherein the machine-made sand is common 20-70 mesh machine-made sand.
Comparative example 4
The preparation method of the cement-based tile is approximately the same as that of the embodiment 1, and the difference is that the raw materials and the parts by weight thereof are as follows: 700 parts of cement, 160 parts of silica fume, 120 parts of mineral powder, 80 parts of fly ash microbeads, 1000 parts of modified machine-made sand, 150 parts of steel fiber, 6 parts of composite modified components, 4 parts of water reducer, 22 parts of shrinkage compensating components, 2 parts of cellulose ether and 185 parts of water; wherein the composite modified component is obtained by compounding graphite powder and high molecular water-absorbing resin according to the mass ratio of 0.5:0.7.
Comparative example 5
The preparation method of the cement-based tile is approximately the same as that of the embodiment 1, and the difference is that the raw materials and the parts by weight thereof are as follows: 700 parts of cement, 160 parts of silica fume, 120 parts of mineral powder, 80 parts of fly ash microbeads, 1000 parts of modified machine-made sand, 150 parts of steel fiber, 6 parts of composite modified components, 4 parts of water reducer, 22 parts of shrinkage compensating components, 2 parts of cellulose ether and 185 parts of water; wherein the composite modified component is obtained by compounding nano magnesium aluminum silicate and high molecular water-absorbing resin according to the mass ratio of 1:0.7.
Comparative example 6
The preparation method of the cement-based tile is approximately the same as that of the embodiment 1, and the difference is that the raw materials and the parts by weight thereof are as follows: 700 parts of cement, 160 parts of silica fume, 120 parts of mineral powder, 80 parts of fly ash microbeads, 1000 parts of modified machine-made sand, 150 parts of steel fiber, 6 parts of composite modified components, 4 parts of water reducer, 22 parts of shrinkage compensating components, 2 parts of cellulose ether and 185 parts of water; wherein the composite modified component is obtained by compounding nano magnesium aluminum silicate and graphite powder according to the mass ratio of 1:0.5.
To verify the production feasibility and mechanical performance indexes of the continuously extrusion molded ultra-high performance cement-based tile obtained in examples 1 to 3, the related performance tests of examples 1 to 3 and comparative examples 1 to 6 were performed with reference to GB/T7019-2014, fiber cement product test method, and J/CT 567-2008, glass fiber reinforced cement wave tile and ridge tile thereof, and the results are shown in Table 1.
Table 1 results of performance tests of examples 1 to 3 and comparative examples 1 to 6
According to the technical means, the invention can realize the continuous extrusion molding of the ultra-high-performance cement-based tile, the transverse flexural strength reaches more than 5000N/m, the longitudinal flexural strength reaches more than 800N, and the maximum length reaches 5 meters.
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
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| CN116063048A (en) * | 2023-02-08 | 2023-05-05 | 华新水泥股份有限公司 | Ultra-high performance concrete tile and preparation method thereof |
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