CN110776334A - Cement-based wallboard with large hollow rate and ultrahigh toughness and preparation method thereof - Google Patents
Cement-based wallboard with large hollow rate and ultrahigh toughness and preparation method thereof Download PDFInfo
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- CN110776334A CN110776334A CN201911055519.9A CN201911055519A CN110776334A CN 110776334 A CN110776334 A CN 110776334A CN 201911055519 A CN201911055519 A CN 201911055519A CN 110776334 A CN110776334 A CN 110776334A
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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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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
- E04C2/044—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres of concrete
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
- E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
- E04C2/36—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a cement-based wallboard with large hollow rate and ultrahigh toughness, which comprises the following components in parts by weight: 650 parts of cement 450-; the compounding ratio adopts the compounding technology of the coagulation regulator, the coagulation time of the composite coagulation regulator is regulated through the composite coagulation regulator, and the volume stability of a hardened body can be improved while the activity of the admixture is excited through the exciting agent in the composite coagulation regulator. The cement-based wallboard with large hollow rate and ultrahigh toughness has high toughness and high strength, excellent workability and durability, and ultra-long service life which meets the requirement of future development.
Description
Technical Field
The invention relates to a cement-based wallboard with large hollow rate and ultrahigh toughness and a preparation method thereof, belonging to the technical field of building materials.
Background
The traditional concrete material has the problems of high brittleness and easy cracking, and the service life of a building structure is seriously influenced. The cement-based composite material with ultrahigh toughness has the characteristics of high toughness, high strength and high durability, accords with the development trend of the current building materials, and can bring good comprehensive benefits by replacing the traditional concrete material with the cement-based composite material. The large-hollow-rate prefabricated wallboard prepared based on the high-toughness cement-based composite material can further reduce the self weight and the volume of a building structure prepared from the ultra-high-toughness cement-based composite material, reduce the comprehensive cost of the building, obviously improve the heat insulation performance of the building structure, and has good economic benefit and social benefit.
Disclosure of Invention
The invention mainly overcomes the defects in the prior art, provides the cement-based wallboard with large hollow rate and ultrahigh toughness and the preparation method thereof, and the prepared composite wallboard has the characteristics of small self weight, cracking resistance, high strength and high durability, and overcomes the defects of poor toughness, easy cracking, short service life and large weight of the traditional concrete wall material.
The technical scheme provided by the invention for solving the technical problems is as follows: the cement-based wallboard with the large hollow rate and the ultrahigh toughness is characterized by comprising the following components in parts by weight: 650 parts of cement 450-. On the basis of the mix proportion optimization of the cement-based composite material with large hollow rate and ultrahigh toughness, the cement-based wallboards with large hollow rate and ultrahigh toughness of different specifications are prepared by adjusting the structural form and the external dimension of the cross section hole, and the hollow rate of the wallboard can be randomly adjusted and realized within the range of 65-85% on the premise of meeting the mechanical property and energy-saving heat preservation.
The further technical scheme is that the cement is one of portland cement, ordinary portland cement, slag portland cement, pozzolanic portland cement, fly ash portland cement and composite portland cement.
The further technical proposal is that the porous material is one of rice hull ash, glass hollow micro-beads, aluminum foam porous material, floating beads and coal gasification slag, and the density of the porous material is 0.7-2.3g/cm
3The specific surface area is 500-1400m
2/kg。
The further technical scheme is that the fine aggregate is one of quartz powder, building micro powder and tailing sand, and the particle size of the fine aggregate is 0.004-1.0 mm.
The further technical scheme is that the superfine powder is one of silica fume, titanium dioxide and glass powder or one of the superfine powders compounded according to different proportions and types, and the particle size of the superfine powder is 0.01-4.0 mu m.
The further technical scheme is that the additive comprises a water reducing agent, a defoaming agent and an organic emulsion.
The water reducing agent is one of a lignin water reducing agent, a naphthalene water reducing agent, a melamine high-efficiency water reducing agent and a polycarboxylate high-efficiency water reducing agent;
the defoaming agent is one of organic silicon defoaming agents, polyether defoaming agents, fatty acids defoaming agents and phosphate defoaming agents;
the organic emulsion is one of butylbenzene emulsion and acrylic ester emulsion.
The further technical proposal is that the fiber comprises organic fiber and inorganic fiber;
the organic fiber is at least one of polypropylene fiber, polypropylene alcohol fiber, polyether fiber, aromatic polyamide fiber, polyvinyl alcohol fiber, polyacrylonitrile fiber and polyethylene fiber;
the inorganic fiber is at least one of calcium carbonate whisker, calcium sulfate whisker, carbon nano tube, carbon fiber, basalt fiber and alkali-resistant glass fiber.
The further technical scheme is that the water-retaining thickening material is one of a mortar plasticizer, rubber powder, cellulose ether and mortar thickening powder.
The further technical scheme is that the set control agent is formed by compounding an excitant, special cement and a retarder, and the setting time of the set control agent is adjusted by compounding the set control agent; the addition of sodium carbonate, potassium carbonate and other excitants can excite the activity of the admixture and improve the volume stability of the hardened body.
The further technical proposal is that the excitant is an inorganic excitant or an organic excitant; the inorganic activator is one of calcium hydroxide, calcium oxide, sodium silicate, sodium metasilicate, potassium silicate, sodium carbonate, potassium carbonate and sulfate; the organic excitant is one of ammonia tri-n-propyl alcohol and triethanolamine;
the special cement comprises one of sulphoaluminate cement, aluminate cement and high-alumina cement;
the retarder is inorganic retarder and organic retarder, and the inorganic retarder is one of phosphate, borax and protein; the organic retarder is one of hydroxyl carboxylate and saccharide.
A preparation method of a cement-based wallboard with large hollow rate and ultrahigh toughness comprises the following steps:
(1) firstly, mixing and stirring weighed cement, mineral admixture, fine aggregate, porous material, coagulation regulator, superfine micro powder and water-retaining thickening material for 30-60s according to the parts by weight;
(2) adding an additive and water, stirring for 120-180s, adding fibers, stirring for 180-240s, and discharging to finish the preparation of the cement-based wallboard mixture with large hollow rate and ultrahigh toughness;
(3) and (3) forming, maintaining and removing the mixture in a specific mould according to an extrusion grouting mode, and finishing the preparation of the cement-based wallboard with large hollow rate and ultrahigh toughness.
The invention has the beneficial effects that: the large-hollow-ratio ultrahigh-toughness cement-based wallboard with the aperture ratio of more than 65 percent, which is prepared by the invention, can greatly reduce the dead weight and the volume of a building structure, improve the heat insulation performance of a building and obviously reduce the building cost. The cement-based wallboard with large hollow rate and ultrahigh toughness has high toughness and high strength, excellent workability and durability, and ultra-long service life which meets the requirement of future development; the preparation method is simple, easy to implement, light in weight, high in toughness, high in strength and good in durability, and can be widely applied to walls, roofs, roads, bridges and the like of industrial and civil buildings.
Drawings
FIG. 1 is a schematic cross-sectional structure of example 1;
FIG. 2 is a schematic cross-sectional structure in example 2;
FIG. 3 is a schematic cross-sectional structure in example 3;
FIG. 4 is a schematic cross-sectional structure in example 4;
FIG. 5 is a schematic cross-sectional view of the structure of example 5.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example 1
A cement-based wallboard with large hollow rate and ultrahigh toughness is composed of the following raw materials in parts by weight: 500 parts of ordinary portland cement, 500 parts of mineral admixture, 50 parts of sulphoaluminate cement, 50 parts of superfine micro powder, 60 parts of porous material, 300 parts of quartz powder, 25 parts of polypropylene fiber, 0.13 part of cellulose ether, 6 parts of water reducing agent, 0.15 part of defoaming agent and 300 parts of water.
The structural form of the section of the cement-based wallboard with large hollow rate and ultrahigh toughness is shown in figure 1, and the hollow rate is 73.54 percent.
Example 2
A cement-based wallboard with large hollow rate and ultrahigh toughness is composed of the following raw materials in parts by weight: 600 parts of ordinary portland cement, 400 parts of mineral admixture, 30 parts of sulphoaluminate cement, 5 parts of sodium carbonate, 5 parts of borax, 80 parts of superfine micro powder, 70 parts of porous material, 350 parts of quartz powder, 30 parts of polyethylene fiber, 0.1 part of cellulose ether, 5 parts of water reducing agent, 0.13 part of defoaming agent and 320 parts of water.
The structural form of the section of the cement-based wallboard with large hollow rate and ultrahigh toughness is shown in figure 2, and the hollow rate is 73.85 percent.
Example 3
A cement-based wallboard with large hollow rate and ultrahigh toughness is composed of the following raw materials in parts by weight: 450 parts of ordinary portland cement, 550 parts of mineral admixture, 40 parts of sulphoaluminate cement, 90 parts of superfine micro powder, 85 parts of porous material, 400 parts of quartz powder, 20 parts of polyacrylonitrile fiber, 0.2 part of cellulose ether, 4 parts of water reducing agent, 0.13 part of defoaming agent and 350 parts of water.
The structural form of the section of the cement-based wallboard with large hollow rate and ultrahigh toughness is shown in figure 3, and the hollow rate is 78.06%.
Example 4
A cement-based wallboard with large hollow rate and ultrahigh toughness is composed of the following raw materials in parts by weight: 550 parts of ordinary portland cement, 450 parts of mineral admixture, 50 parts of sulphoaluminate cement, 2 parts of calcium oxide, 50 parts of superfine micro powder, 60 parts of porous material, 300 parts of quartz powder, 25 parts of polyvinyl alcohol fiber, 0.3 part of cellulose ether, 7 parts of water reducing agent, 1.0 part of butylbenzene emulsion, 0.1 part of defoaming agent and 290 parts of water.
The structural form of the section of the cement-based wallboard with large hollow rate and ultrahigh toughness is shown in figure 4, and the hollow rate is 75.47%.
Example 5
A cement-based wallboard with large hollow rate and ultrahigh toughness is composed of the following raw materials in parts by weight: 550 parts of ordinary portland cement, 350 parts of mineral admixture, 60 parts of sulphoaluminate cement, 70 parts of superfine micro powder, 60 parts of porous material, 500 parts of quartz powder, 20 parts of polyvinyl alcohol fiber and polypropylene fiber (the weight ratio of the polyvinyl alcohol fiber to the polypropylene fiber is 2:1), 0.2 part of cellulose ether, 8 parts of water reducing agent, 1.5 parts of butylbenzene emulsion, 0.1 part of defoaming agent and 280 parts of water.
The structural form of the section of the cement-based wallboard with large hollow rate and ultrahigh toughness is shown in figure 5, and the hollow rate is 82.24%.
The results of the performance tests of the cement-based composite materials with large hollow rate and ultrahigh toughness prepared in examples 1 to 5 show that the flexural strength/compressive strength of the base material was measured using a test piece of 40mm × 40mm × 160mm, and the thermal conductivity of the base material was measured using a test piece of 300mm × 300mm × 30mm, as shown in Table 1.
TABLE 1 Performance test results of cement-based composites with high hollow rate and ultrahigh toughness
On the premise of meeting mechanical properties and energy-saving heat preservation, the cement-based wallboard with large hollow rate and ultrahigh toughness further adopts the technical scheme that the hollow rate is realized by arranging different ribs in a cavity of the wallboard, the length, the width and the shape of the ribs can be adjusted, the ribs can be communicated ribs and discontinuous ribs in the length direction of the wallboard, and the arrangement form of the ribs on the premise of meeting the hollow rate, the mechanical properties and the energy-saving heat preservation is not limited by 5 examples listed in the invention.
The structural form of the transverse section holes of the cement-based wallboard with large hollow rate and ultrahigh toughness is not limited to 5 examples listed in the invention, and the further technical scheme is that the transverse section holes can be single-row holes, double-row holes and multi-row holes by combining different hollow rates and structural requirements, the multi-row holes can be distributed in a staggered mode or a symmetrical mode, and the distribution form is not limited. The shape of the hole can be rectangular, round, elliptical, diamond, etc., without limitation. Wherein the wallboard cavity can also be provided with a hole structure according to the requirements of the decoration pipeline.
The external dimension of the cement-based wallboard with large hollow rate and ultrahigh toughness is not limited to 5 embodiments listed in the invention, and the further technical scheme is that the cement-based wallboard can be adjusted according to requirements, the length can be adjusted from 600mm to 4500mm, the width can be adjusted from 300mm to 2000mm, and the thickness can be adjusted from 60mm to 300 mm.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited to the above embodiments, and those skilled in the art can make various changes and modifications without departing from the scope of the present invention.
Claims (10)
1. The cement-based wallboard with the large hollow rate and the ultrahigh toughness is characterized by comprising the following components in parts by weight: 650 parts of cement 450-; the compounding ratio adopts a pour point modifier compounding technology, the setting time of the pour point modifier is adjusted through the compound pour point modifier, the volume stability of a hardening body can be improved while the activity of an admixture is excited through an exciting agent in the compound pour point modifier, the large-hollow-rate ultrahigh-toughness cement-based wallboards with different specifications are prepared by adjusting the structural form and the external dimension of cross section holes on the basis of optimizing the compounding ratio of the large-hollow-rate ultrahigh-toughness cement-based, and the hollow rate of the wallboards can be adjusted and realized at will within the range of 65-85% on the premise of meeting the mechanical property and energy-saving heat preservation.
2. The cement-based wall panel with high void content and ultrahigh toughness of claim 1, wherein the cement is one of portland cement, ordinary portland cement, portland slag cement, pozzolanic portland cement, portland fly ash cement, and composite portland cement.
3. The cement-based wallboard with large voidage and ultrahigh toughness of claim 1, wherein the mineral admixture is one of milled or air-separated fly ash, mineral powder, limestone powder and volcanic ash or one of the admixture compounded according to different proportions and types.
4. The cement-based wallboard with large hollow rate and ultrahigh toughness of claim 1, wherein the ultrafine powder is one of silica fume, titanium dioxide and glass powder or one of the ultrafine powders compounded according to different proportions and types, the particle size of the ultrafine powder is 0.01-4.0 μm, the ultrafine powder can further increase the density of the matrix material, improve the flexural/compressive strength of the matrix material, and form continuous gradation with fine aggregates to achieve the effect of closest packing.
5. The cement-based wallboard with high void content and ultrahigh toughness as claimed in claim 1, wherein the porous material is one of rice hull ash, glass hollow micro-beads, aluminum foam porous material, floating beads and gasified slag, and the density of the porous material is 0.7-2.3g/cm
3The specific surface area is 500-1400m
2The curing agent/kg can play a self-curing role and reduce the self-shrinkage of the base material.
6. The cement-based wallboard with high void content and ultrahigh toughness as claimed in claim 1, wherein the fine aggregate is one of quartz powder, building micropowder and tailing sand, and the particle size of the fine aggregate is 0.004-1.0 mm.
7. The cement-based wallboard with high void content and ultrahigh toughness as set forth in claim 1, wherein said admixture comprises water reducing agent, defoaming agent, organic emulsion and the like.
The water reducing agent is one of a lignin water reducing agent, a naphthalene water reducing agent, a melamine high-efficiency water reducing agent and a polycarboxylate high-efficiency water reducing agent;
the defoaming agent is one of organic silicon defoaming agents, polyether defoaming agents, fatty acids defoaming agents and phosphate defoaming agents;
the organic emulsion is one of butylbenzene emulsion, tung oil and acrylic ester emulsion, and can effectively reduce the volume weight and the heat conductivity coefficient of the base material.
8. The cement-based wallboard with high void content and ultra-high toughness as claimed in claim 1, wherein the fibers comprise organic fibers, inorganic fibers or composite fibers;
the organic fiber is at least one of polypropylene fiber, polypropylene alcohol fiber, polyether fiber, aromatic polyamide fiber, polyvinyl alcohol fiber, polyacrylonitrile fiber and polyethylene fiber;
the inorganic fiber is at least one of calcium carbonate whisker, calcium sulfate whisker, carbon nano tube, carbon fiber, basalt fiber and alkali-resistant glass fiber;
the water-retaining thickening material is one of a mortar plasticizer, rubber powder, cellulose ether and mortar thickening powder;
the set control agent is formed by compounding an excitant, special cement and a retarder;
the excitant is an inorganic excitant or an organic excitant; the inorganic activator is one of calcium hydroxide, calcium oxide, sodium silicate, sodium metasilicate, potassium silicate, sodium carbonate, potassium carbonate and sulfate, wherein the addition of the sodium carbonate and the potassium carbonate can improve the volume stability of a hardened body while exciting the activity of the admixture; the organic excitant is one of ammonia tri-n-propyl alcohol and triethanolamine;
the special cement comprises one of sulphoaluminate cement, aluminate cement and high-alumina cement;
the retarder is inorganic retarder and organic retarder, and the inorganic retarder is one of phosphate, borax and protein; the organic retarder is one of hydroxyl carboxylate and saccharide.
9. The cement-based wallboard with the large hollow rate and the ultrahigh toughness as claimed in claim 1, wherein the hollow rate of the cement-based wallboard with the large hollow rate and the ultrahigh toughness can be adjusted and realized at will within the range of 65% -85%, on the premise of meeting mechanical properties and energy-saving heat preservation, the hollow rate is realized by arranging different ribs in the cavity of the wallboard, the length, the width and the shape of the ribs can be adjusted, the ribs can be communicated ribs and discontinuous ribs in the length direction of the wallboard, and the arrangement form of the ribs is not limited on the premise of meeting the hollow rate, the mechanical properties and the energy-saving heat preservation;
the structural form of the transverse section holes of the cement-based wallboard with large hollow rate and ultrahigh toughness is combined with different hollow rates and structural requirements, and can be single-row holes, double-row holes and multi-row holes, the multi-row holes can be distributed in a staggered mode or in a symmetrical mode, and the distribution form is not limited; the shape of hole can be rectangular hole, round hole, elliptical hole, diamond-shaped block etc. and the shape is not limited, big hollow rate ultra high toughness cement based wallboard overall dimension can adjust as required, and length can be adjusted between 600mm to 4500mm, and the width can be adjusted between 300mm to 2000mm, and thickness can be adjusted between 60mm to 300 mm.
10. A method for preparing a large hollow rate ultra-high toughness cement based wallboard according to any one of claims 1-9, comprising the steps of:
(1) firstly, mixing and stirring weighed cement, mineral admixture, fine aggregate, porous material, coagulation regulator, superfine micro powder and water-retaining thickening material for 30-60s according to the parts by weight;
(2) adding an additive and water, stirring for 60-180s, adding fibers, stirring for 180s and discharging for 240s to finish the preparation of the cement-based wallboard mixture with large hollow rate and ultrahigh toughness;
(3) and (3) forming, maintaining and removing the mixture in a specific mould according to an extrusion grouting mode, and finishing the preparation of the cement-based wallboard with large hollow rate and ultrahigh toughness.
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| CN111844412A (en) * | 2020-06-23 | 2020-10-30 | 中建西部建设建材科学研究院有限公司 | Production process of ultrahigh-performance concrete-based large-hollow-rate wallboard |
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