CN116535158A - Corrosion-resistant high-limestone-doped high-ductility cement-based composite material and preparation method thereof - Google Patents
Corrosion-resistant high-limestone-doped high-ductility cement-based composite material and preparation method thereof Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 127
- 239000002131 composite material Substances 0.000 title claims abstract description 99
- 238000005260 corrosion Methods 0.000 title claims abstract description 20
- 230000007797 corrosion Effects 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 129
- 239000006028 limestone Substances 0.000 claims abstract description 123
- 235000019738 Limestone Nutrition 0.000 claims abstract description 110
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 86
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 86
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 79
- 239000000843 powder Substances 0.000 claims abstract description 76
- 239000000835 fiber Substances 0.000 claims abstract description 48
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 46
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 46
- 239000002994 raw material Substances 0.000 claims abstract description 31
- 230000003628 erosive effect Effects 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims description 57
- 239000000203 mixture Substances 0.000 claims description 57
- 239000011398 Portland cement Substances 0.000 claims description 32
- 238000005303 weighing Methods 0.000 claims description 14
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 229920005646 polycarboxylate Polymers 0.000 claims description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 6
- RUYJNKYXOHIGPH-UHFFFAOYSA-N dialuminum;trioxido(trioxidosilyloxy)silane Chemical compound [Al+3].[Al+3].[O-][Si]([O-])([O-])O[Si]([O-])([O-])[O-] RUYJNKYXOHIGPH-UHFFFAOYSA-N 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 2
- 239000003469 silicate cement Substances 0.000 claims 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052799 carbon Inorganic materials 0.000 abstract description 9
- 239000004567 concrete Substances 0.000 abstract description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 4
- 239000004576 sand Substances 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000006004 Quartz sand Substances 0.000 abstract description 2
- 239000010453 quartz Substances 0.000 abstract description 2
- 239000000945 filler Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 13
- 230000000694 effects Effects 0.000 description 10
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 7
- 238000006703 hydration reaction Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000002441 X-ray diffraction Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 6
- 230000036571 hydration Effects 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000002910 solid waste Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 235000012241 calcium silicate Nutrition 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- -1 Monocarbon aluminates Chemical class 0.000 description 1
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 239000002969 artificial stone Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011182 bendable concrete Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000009725 powder blending Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 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
- 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
- C04B28/04—Portland cements
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/10—Clay
- C04B14/106—Kaolin
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2015—Sulfate resistance
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an erosion-resistant high-limestone-doped high-ductility cement-based composite material and a preparation method thereof, and belongs to the technical field of concrete. The raw materials of the corrosion-resistant high-limestone-content high-ductility cement-based composite material comprise the following components in percentage by weight: limestone powder 859-944 kg/m 3 Calcined kaolin 236-684 kg/m 3 215-708 kg/m of cement 3 502-577 kg/m of water 3 The water reducing agent is 11-24 kg/m 3 6.5-39 kg/m polyvinyl alcohol fiber 3 . The invention has the characteristics of cracking resistance, erosion resistance, low carbon, environmental protection, high ductility, high compressive strength and stable later strength. The high-doping limestone is adopted in the raw materials to completely replace the characteristics of conventional fiber reinforced cement-based composite materials such as quartz sand, quartz powder or fine sand and the like as inert fillers, the fibers in the high-doping limestone can effectively prevent the crack propagation of fine marks of the composite materials, the sulfate erosion resistance is excellent, the sustainable development of the cement-based composite materials is greatly promoted, and the preparation method is simple, quick, convenient and easy to implement.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to an erosion-resistant high-limestone-doped high-ductility cement-based composite material and a preparation method thereof.
Background
The engineering composite material, namely the fiber reinforced cement-based composite material (ECC, engineered Cementitious Composites), is a high-ductility fiber reinforced cement-based composite material, well solves the inherent brittleness of concrete and cement products, generates a large number of fine cracks under the actions of bending, stretching and the like, can control the maximum crack width to be within 100 mu m, has high ductility, high toughness and high energy absorption capacity, but has the defects of large cement glue consumption, large carbon emission and high energy consumption required by the preparation of the traditional ECC material, and severely limits the popularization and application of the ECC material.
The natural sandstone aggregate is used as a resource which is difficult to regenerate, so that the natural sandstone aggregate is increasingly exhausted, the concrete aggregate needs in engineering construction are difficult to meet, and more construction projects begin to use artificial sandstone aggregate. In the process of producing machine-made sand by an artificial stone breaking system, various natural limestone stones inevitably generate a large amount of waste limestone powder particles during mechanical breaking, and the large amount of solid wastes cause serious damage to the ecological environment.
Therefore, the research on the anti-erosion high-limestone-doped high-ductility cement-based composite material has very broad market prospect.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, in a first aspect the present invention provides an anti-corrosion high lime having high ductility, low carbon and environmental protection, crack and corrosion resistance and high compressive strength after curingThe raw materials of the stone-doped high-ductility cement-based composite material comprise the following components in percentage by weight: limestone powder 859-944 kg/m 3 Calcined kaolin 236-684 kg/m 3 215-708 kg/m of cement 3 502-577 kg/m of water 3 11-24 kg/m water reducer 3 6.5-39 kg/m polyvinyl alcohol fiber 3 。
The invention applies the limestone powder with high doping amount to the cement-based composite material, and can generate good economic benefit and environmental benefit. Limestone powder has certain chemical activity in cement-based material, and its main component is calcium carbonate (CaCO) 3 ) The effects can be categorized into acceleration effects, activity effects and particle morphology effects. In early stage of hydration, limestone powder with proper dosage serves as a nucleation matrix of hydrated calcium silicate gel (C-S-H gel), so that a nucleation barrier is lowered, and hydration of cement is accelerated. In the later stage of hydration, aluminum in limestone powder and cement/mineral admixture react to generate carboaluminate compounds with certain gelling capacity, and the carboaluminate compounds are mutually overlapped with other hydration products, so that the cement stone structure is more compact, and the mechanical property and durability of the cement stone are improved.
Calcined kaolin is a product formed by removing water and hydroxyl groups from kaolin as a raw material at a proper temperature, and contains anhydrous aluminum silicate (Al as a main component 2 O 3 ·2SiO 2 Is denoted AS AS 2 ). The calcined kaolin is in a thermodynamic medium-stable state and has filling effect and pozzolan reaction, and aluminum phase substances (marked as A) of the calcined kaolin can promote hydration reaction of cement clinker in cement-based materials, namely calcium hydroxide (marked as CH) of hydration product of cement is accelerated to participate in the reaction, so that the strength of concrete is improved, the microstructure of the concrete is improved, and the durability of the concrete is improved. At the same time, the aluminum phase auxiliary cementing material such as calcined kaolin can well excite limestone powder, namely calcium carbonate (marked as) Fully exert the 'synergistic effect' of the two, and the two react to generate the semi-carbon aluminate (named +.>) Monocarbon aluminates (denoted +.>) And the stability of the calcium sulfate and the calcium sulfate is higher than that of monosulfur hydrated calcium sulfoaluminate (AFm), and the calcium sulfate can inhibit the conversion of AFm to ettringite (AFt) to a certain extent in the sulfate erosion process, so that the sulfate erosion process is inhibited to a certain extent. The reaction expression of calcined kaolin, limestone powder and cement hydration products is as follows:
preferably, the limestone powder is powder prepared by grinding limestone, drying and sieving, and the main component of the limestone powder is calcium carbonate.
Further preferably, the limestone powder has a median particle size of 5 to 20 μm.
Preferably, the calcined kaolin is prepared by the following method: calcining kaolin at 600-900 ℃ to dehydrate the kaolin to form anhydrous aluminum silicate, and then grinding and sieving the anhydrous aluminum silicate to obtain calcined kaolin with the median particle size of 4-5 mu m.
Preferably, the cement is at least one of type I portland cement (P.I), type II portland cement (P.II) and ordinary portland cement (P.O).
Further preferably, the ordinary portland cement has a strength grade of any one of 42.5, 42.5R, 52.5R.
Preferably, the water reducing efficiency of the water reducing agent is 30-40%.
Further preferably, the water reducing agent is a polycarboxylate water reducing agent, the water reducing efficiency of the polycarboxylate water reducing agent is 32% -38%, and the solid content of the polycarboxylate water reducing agent is 28% -32%.
Preferably, the length of the polyvinyl alcohol fiber is 10-14 mm, the diameter of the fiber is 5-100 mu m, the tensile strength is more than or equal to 1600MPa, the tensile elastic modulus is more than 40GPa, and the density of the fiber is 1.2-1.4 g/cm 3 。
In a second aspect of the present invention, a method for preparing an erosion resistant high limestone blend high ductility cement-based composite material is provided, which is simple, fast, convenient and easy, and comprises the steps of:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the erosion-resistant high-limestone-content high-ductility cement-based composite material adopts a large amount of solid waste such as limestone powder, can efficiently solve the problems of stacking industrial solid waste and the like in limestone exploitation and manual sand processing industry, solves the problems of recycling limestone powder and shortage of mineral admixture, saves mineral resources, protects ecological environment and changes waste into valuable. The invention adopts the limestone powder with high doping amount to completely replace the conventional inert filling aggregate such as quartz sand, quartz powder or fine sand in the fiber reinforced cement-based composite material, reduces the consumption of cement, has the advantages of low energy consumption, low carbon emission and the like, and promotes the green development of the high-ductility cement-based composite material. In addition, the calcined kaolin in the components can well excite the chemical activity of limestone powder, fully exert the synergistic effect of the calcined kaolin and the limestone powder, react with each other to generate semi-carbon aluminate and single-carbon aluminate with certain gelling capacity, have excellent sulfate erosion resistance and good durability, and promote the long-term sustainable development of the high-ductility cement-based composite material. The water reducer and limestone powder-calcined kaolin-cement composite material system exert better suitability, excellent working performance and good fluidity. Finally, the cured anti-corrosion high-limestone-doped high-ductility cement-based composite material is anti-cracking and anti-corrosion, and the fiber in the composite material can efficiently prevent the crack expansion of the fine mark of the composite material, so that the crack width is small; in terms of macroscopic mechanical properties, the tensile property of the alloy is excellent, has high ductility and toughness, high compressive strength and stable later strength.
The invention provides a preparation method of an anti-erosion high-limestone-doped high-ductility cement-based composite material, which has the advantages of simple and convenient process flow and low production cost, reduces the engineering cost of the composite material and improves the economic benefit.
Drawings
FIG. 1 is an XRD pattern of limestone powder used in examples 1 to 6 of the present invention;
FIG. 2 is an XRD pattern of calcined kaolin used in examples 1 to 6 of the present invention;
FIG. 3 is an XRD pattern of Portland cement P.O42.5 used in examples 1 to 6 of the present invention;
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods, in which specific conditions are not noted in the following examples, were selected according to conventional methods and conditions, or according to the commercial specifications.
In the following examples:
limestone powder is prepared from limestone through grinding, drying and sieving, and the median particle diameter is 5-20 mu m; calcined kaolin with a median particle size of 4-5 μm; the water reducer adopts a polycarboxylate water reducer, the water reducing efficiency is 32-38%, and the solid content is 28-32%; polyvinyl alcohol fiber with length of 10-14 mm, fiber diameter of 5-100 μm, tensile strength not less than 1600MPa, and resistanceThe tensile elastic modulus is more than 40GPa, and the fiber density is 1.2-1.4 g/cm 3 。
Example 1
The high-ductility cement-based composite material with high limestone content and corrosion resistance comprises the following raw materials in percentage by weight: limestone powder 944kg/m 3 Calcined kaolin 236kg/m 3 708kg/m of P.O42.5 ordinary Portland cement 3 519kg/m of water 3 The water reducer is 16kg/m 3 Polyvinyl alcohol fibres 26kg/m 3 。
The calcined kaolin of this example was prepared from kaolin calcined and dehydrated at 600 ℃.
The preparation method of the anti-erosion high-limestone-doped high-ductility cement-based composite material comprises the following steps:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, P.O42.5 ordinary Portland cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Example 2
The high-ductility cement-based composite material with high limestone content and corrosion resistance comprises the following raw materials in percentage by weight: limestone powder 928kg/m 3 Calcined kaolin 464kg/m 3 P.O42.5 Portland Cement 464kg/m 3 510kg/m of water 3 The water reducer is 21kg/m 3 Polyvinyl alcohol fibres 26kg/m 3 。
The calcined kaolin of this example was prepared from kaolin calcined and dehydrated at 600 ℃.
The preparation method of the anti-erosion high-limestone-doped high-ductility cement-based composite material comprises the following steps:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, P.O42.5 ordinary Portland cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Example 3
The high-ductility cement-based composite material with high limestone content and corrosion resistance comprises the following raw materials in percentage by weight: limestone powder 912kg/m 3 Calcined kaolin 684kg/m 3 228kg/m of P.O42.5 ordinary Portland cement 3 502kg/m of water 3 The water reducer is 24kg/m 3 Polyvinyl alcohol fibres 26kg/m 3 。
The calcined kaolin of this example was prepared from kaolin calcined and dehydrated at 600 ℃.
The preparation method of the anti-erosion high-limestone-doped high-ductility cement-based composite material comprises the following steps:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, P.O42.5 ordinary Portland cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Example 4
The high-ductility cement-based composite material with high limestone content and corrosion resistance comprises the following raw materials in percentage by weight: limestone powder 888kg/m 3 Calcined kaolin 222kg/m 3 P.O42.5 Portland cement 666kg/m 3 577kg/m of water 3 The water reducing agent is 11kg/m 3 Polyvinyl alcohol fibres 26kg/m 3 。
The calcined kaolin of this example was prepared from kaolin calcined and dehydrated at 600 ℃.
The preparation method of the anti-erosion high-limestone-doped high-ductility cement-based composite material comprises the following steps:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, P.O42.5 ordinary Portland cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Example 5
The high-ductility cement-based composite material with high limestone content and corrosion resistance comprises the following raw materials in percentage by weight: limestone powder 874kg/m 3 437kg/m calcined kaolin 3 P.O42.5 Portland cement 437kg/m 3 568kg/m of water 3 The water reducing agent is 15kg/m 3 Polyvinyl alcohol fibres 26kg/m 3 。
The calcined kaolin of this example was prepared from kaolin calcined and dehydrated at 600 ℃.
The preparation method of the anti-erosion high-limestone-doped high-ductility cement-based composite material comprises the following steps:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, P.O42.5 ordinary Portland cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Example 6
The high-ductility cement-based composite material with high limestone content and corrosion resistance comprises the following raw materials in percentage by weight: limestone powder 859kg/m 3 Calcined kaolin 644kg/m 3 215kg/m of P.O42.5 ordinary Portland cement 3 558kg/m of water 3 The water reducer is 17kg/m 3 Polyvinyl alcohol fibres 26kg/m 3 。
The calcined kaolin of this example was prepared from kaolin calcined and dehydrated at 600 ℃.
The preparation method of the anti-erosion high-limestone-doped high-ductility cement-based composite material comprises the following steps:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, P.O42.5 ordinary Portland cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Example 7
The high-ductility cement-based composite material with high limestone content and corrosion resistance comprises the following raw materials in percentage by weight: limestone powder 928kg/m 3 Calcined kaolin 464kg/m 3 P O42.5R Portland cement 464kg/m 3 510kg/m of water 3 The water reducer is 21kg/m 3 Polyvinyl alcohol fibres 6.5kg/m 3 。
The calcined kaolin of this example was prepared from kaolin calcined and dehydrated at 900 ℃.
The preparation method of the anti-erosion high-limestone-doped high-ductility cement-based composite material comprises the following steps:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, P O42.5R ordinary Portland cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Example 8
The high-ductility cement-based composite material with high limestone content and corrosion resistance comprises the following raw materials in percentage by weight: limestone powder 928kg/m 3 Calcined kaolin 464kg/m 3 P.O52.5 Portland Cement 464kg/m 3 510kg/m of water 3 The water reducer is 21kg/m 3 39kg/m of polyvinyl alcohol fibres 3 。
The calcined kaolin of this example was prepared from kaolin calcined and dehydrated at 600 ℃.
The preparation method of the anti-erosion high-limestone-doped high-ductility cement-based composite material comprises the following steps:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, P.O52.5 ordinary Portland cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Example 9
The high-ductility cement-based composite material with high limestone content and corrosion resistance comprises the following raw materials in percentage by weight: limestone powder 928kg/m 3 Calcined kaolin 464kg/m 3 P O52.5R Portland cement 464kg/m 3 510kg/m of water 3 The water reducer is 21kg/m 3 Polyvinyl alcohol fibres 26kg/m 3 。
The calcined kaolin of this example was prepared from kaolin calcined and dehydrated at 600 ℃.
The preparation method of the anti-erosion high-limestone-doped high-ductility cement-based composite material comprises the following steps:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, P O52.5R ordinary Portland cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Example 10
The high-ductility cement-based composite material with high limestone content and corrosion resistance comprises the following raw materials in percentage by weight: limestone powder 928kg/m 3 Calcined kaolin 464kg/m 3 P.I. 42.5 Portland cement 464kg/m 3 510kg/m of water 3 The water reducer is 21kg/m 3 Polyvinyl alcohol fibres 26kg/m 3 。
The calcined kaolin of this example was prepared from kaolin calcined and dehydrated at 600 ℃.
The preparation method of the anti-erosion high-limestone-doped high-ductility cement-based composite material comprises the following steps:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, P.I 42.5 Portland cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Example 11
The high-ductility cement-based composite material with high limestone content and corrosion resistance comprises the following raw materials in percentage by weight: limestone powder 928kg/m 3 Calcined kaolin 464kg/m 3 ，P·II 42.5 Portland Cement 464kg/m 3 510kg/m of water 3 The water reducer is 21kg/m 3 Polyvinyl alcohol fibres 26kg/m 3 。
The calcined kaolin of this example was prepared from kaolin calcined and dehydrated at 600 ℃.
The preparation method of the anti-erosion high-limestone-doped high-ductility cement-based composite material comprises the following steps:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, P.II 42.5 Portland cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Comparative example 1
The high-ductility cement-based composite material with high limestone content and corrosion resistance comprises the following raw materials in percentage by weight: limestone powder 960kg/m 3 P.O42.5 Portland cement 960kg/m 3 528kg/m of water 3 Polyvinyl alcohol fibres 26kg/m 3 。
The preparation method of the anti-erosion high-limestone-doped high-ductility cement-based composite material comprises the following steps:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone-content high-ductility cement-based composite material, and weighing limestone powder, P.O42.5 ordinary Portland cement, water and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder and cement to obtain a first mixture;
(3) Adding water into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
Test example 1
According to national standards GB/T2419-2005, GB/T17671-2021, GB/T50082-2009, building material industry standards JC/T2461-2018 and water conservancy industry standards SLT 352-2020, performance tests are carried out on the anti-erosion high limestone doped high-ductility cement-based composite materials prepared according to partial embodiments and comparative examples, wherein the fluidity is tested according to GB/T2419-2005, the anti-erosion high limestone doped high-ductility cement-based composite materials are poured, vibrated and molded, the materials are placed into a standard curing environment for curing, the cured materials are tested according to GB/T17671-2021 for ' 28d compressive strength ' and ' 90d compressive strength ' after curing 28d and 90d ultimate tensile strength ', ' 28d ultimate elongation ' and ' 28d average crack width ' respectively, the anti-sulfate grade (anti-sulfate erosion coefficient) is tested according to GB/T50082-2009 and SLT 352-2020. The results of the performance test are shown in Table 1.
Table 1: results of corresponding Performance tests of the erosion resistant high limestone doped high ductility cement based composite of examples 1-6 and comparative example 1 before and after curing
The X-ray diffraction test is carried out on limestone powder, calcined kaolin and P.O42.5 ordinary Portland cement adopted by the invention. The limestone powder has calcite (CaCO) as main mineral component 3 ) An XRD pattern corresponding to figure 1; the main mineral component of calcined kaolin contains a small amount of crystalline quartz (SiO 2 ) Anatase (TiO) 2 ) A large amount of amorphous silica and alumina, corresponding to X of fig. 2RD map; the main mineral components of p.o42.5 ordinary portland cement contain tricalcium silicate, dicalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite, dihydrate gypsum and anhydrite, corresponding to the XRD pattern of fig. 3.
As can be seen from the results in Table 1, examples 1 to 6 of the present invention have good fluidity, excellent tensile properties, high ductility and toughness, excellent cracking resistance, high compressive strength, and stable post strength. The high-mixing limestone powder has feasibility, and can obviously reduce the consumption of cement on the premise of ensuring excellent mechanical properties.
The 28d ultimate tensile strength of comparative example 1 was slightly higher than that of examples 1 to 6, but the 28d ultimate elongation thereof was less excellent. According to the design concept and the design purpose of the fiber reinforced cement-based composite material, the evaluation index of 28d ultimate tensile strength and 28d ultimate elongation are combined to look at: on the other hand, the range of ultimate tensile strength of examples 1 to 6 was 2.5 to 4.8MPa, and the tensile strength was not greatly different from that of comparative example 1, and was substantially at the same level. On the other hand, the ultimate elongation at 28d of the groups of examples 1 to 6 was increased from 0.6% to 5.7% as compared with comparative example 1, and the test results were ranked from small to large: comparative example 1 (0.6%) < example 1 (0.7%) < example 4 (0.8%) < example 2 (1.3%) < example 5 (2.1%) < example 6 (4.0%) < example 3 (5.7%). Examples 1 to 6 have mechanical properties of high ductility (high toughness) as compared with comparative example 1. This demonstrates that the ultra-high doped limestone powder, calcined kaolin and cement composite system of the anti-erosion high limestone doped high-ductility cement-based composite material of the invention can ensure excellent ultimate tensile strength after curing and also remarkably improve ultimate elongation.
Comparative example 1 compared to examples 1-6, only the 28d average slit width of example 1 was slightly worse than comparative example 1, and the 28d average slit widths of examples 2-6 were all better than comparative example 1. The 28d average crack width of examples 1 to 6 is effectively controlled within 300 μm; further, the average crack width of 28d in examples 2 to 6 was effectively controlled to be 100 μm or less. This shows that the fiber in the high-ductility cement-based composite material with high limestone content can effectively prevent the crack propagation of the fine mark of the composite material, and the cracking resistance is very excellent.
Comparative example 1 shows a poor tendency to develop the compressive strength in the later stage when only an ultra-high amount of limestone powder is used and calcined kaolin is not used, and a "collapse" of the compressive strength of 90d occurs, as compared with examples 1 to 6; when ultra-high amounts of limestone powder and metakaolin were used, the compressive strength of examples 1 to 6 was higher and the later strength developed steadily. The invention shows that the erosion-resistant high-limestone-doped high-ductility cement-based composite material can effectively overcome the adverse effect of ultrahigh-doped limestone powder on the later development of compressive strength through reasonable optimization design and regulation.
Comparative example 1 in comparison with examples 1 to 6, examples 1 to 6 all maintained excellent mechanical properties and sulfate resistance grade under the same limestone powder blending amount, which demonstrates that the high-ductility cement-based composite material with high erosion resistance and limestone blending amount according to the present invention is excellent in sulfate erosion resistance and good in durability. The calcined kaolin of the anti-erosion high-limestone-doped high-ductility cement-based composite material can well excite the chemical activity of limestone powder, fully exert the synergistic effect of the limestone powder and the calcined kaolin, and react to generate semi-carbon aluminate and single-carbon aluminate with certain gelling capacity; can promote the long-term sustainable development of the high-ductility cement-based composite material.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. The high-ductility cement-based composite material with high limestone content and corrosion resistance is characterized by comprising the following raw materials in percentage by weight: limestone powder 859-944 kg/m 3 236kg to 684kg of calcined kaolin/m 3 215-708 kg/m of cement 3 502-577 kg/m of water 3 11-24 kg/m water reducer 3 6.5-39 kg/m polyvinyl alcohol fiber 3 。
2. The erosion resistant high limestone doped high ductility cement based composite of claim 1 wherein: the limestone powder is powder prepared by grinding limestone, drying and sieving, and the main component of the limestone powder is calcium carbonate.
3. The erosion resistant high limestone doped high ductility cement based composite of claim 1 or 2, wherein: the median particle diameter of the limestone powder is 5-20 mu m.
4. The erosion resistant high limestone doped high ductility cement based composite of claim 1 wherein the calcined kaolin is prepared by: calcining kaolin at 600-900 ℃ to dehydrate the kaolin to form anhydrous aluminum silicate, and then grinding and sieving the anhydrous aluminum silicate to obtain calcined kaolin with the median particle size of 4-5 mu m.
5. The erosion resistant high limestone doped high ductility cement based composite of claim 1 wherein: the cement is at least one of type I silicate cement, type II silicate cement and ordinary silicate cement.
6. The erosion resistant high limestone doped high ductility cement based composite of claim 5 wherein: the strength grade of the Portland cement is any one of 42.5, 42.5R, 52.5 and 52.5R.
7. The erosion resistant high limestone doped high ductility cement based composite of claim 1 wherein: the water reducing efficiency of the water reducing agent is 30-40%.
8. The erosion resistant high limestone doped high ductility cement based composite of claim 7 wherein: the water reducer is a polycarboxylate water reducer, the water reducing efficiency of the polycarboxylate water reducer is 32% -38%, and the solid content of the polycarboxylate water reducer is 28% -32%.
9. The erosion resistant high limestone doped high ductility cement based composite of claim 1 wherein: the length of the polyvinyl alcohol fiber is 10-14 mm, the diameter of the fiber is 5-100 mu m, the tensile strength is more than or equal to 1600MPa, the tensile elastic modulus is more than 40GPa, and the density of the fiber is 1.2-1.4 g/cm 3 。
10. The method of preparing an erosion resistant high limestone doped high ductility cement based composite material according to any of claims 1 to 9, comprising the steps of:
(1) Preparing raw materials of each component according to the formula proportion of the anti-erosion high-limestone high-ductility cement-based composite material, and weighing limestone powder, calcined kaolin, cement, water, a water reducing agent and polyvinyl alcohol fibers in corresponding proportions;
(2) Uniformly mixing limestone powder, calcined kaolin and cement to obtain a first mixture; uniformly mixing water and a water reducing agent to obtain a water reducing agent solution;
(3) Adding the water reducer solution into the first mixture, and uniformly mixing to obtain a second mixture;
(4) And adding polyvinyl alcohol fibers into the second mixture, and uniformly mixing to obtain the anti-erosion high-limestone-content high-ductility cement-based composite material.
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| CN109053080A (en) * | 2018-09-13 | 2018-12-21 | 郑州大学 | Environmentally friendly high ductility cement-base composite material of one kind and preparation method thereof |
| CN110627393A (en) * | 2019-11-14 | 2019-12-31 | 中国中材国际工程股份有限公司 | High-activity composite mixed material for improving erosion resistance of cement concrete |
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| CN109053080A (en) * | 2018-09-13 | 2018-12-21 | 郑州大学 | Environmentally friendly high ductility cement-base composite material of one kind and preparation method thereof |
| CN110627393A (en) * | 2019-11-14 | 2019-12-31 | 中国中材国际工程股份有限公司 | High-activity composite mixed material for improving erosion resistance of cement concrete |
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