CN113277756A - Early-strength special cementing material and preparation method thereof - Google Patents
Early-strength special cementing material and preparation method thereof Download PDFInfo
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- CN113277756A CN113277756A CN202110720608.1A CN202110720608A CN113277756A CN 113277756 A CN113277756 A CN 113277756A CN 202110720608 A CN202110720608 A CN 202110720608A CN 113277756 A CN113277756 A CN 113277756A
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- 239000000463 material Substances 0.000 title claims abstract description 200
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 86
- 239000000843 powder Substances 0.000 claims abstract description 32
- 235000019738 Limestone Nutrition 0.000 claims abstract description 29
- 239000006028 limestone Substances 0.000 claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 17
- 239000011707 mineral Substances 0.000 claims abstract description 17
- 239000004927 clay Substances 0.000 claims abstract description 16
- 229910052586 apatite Inorganic materials 0.000 claims abstract description 15
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 15
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- 239000010440 gypsum Substances 0.000 claims abstract description 15
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 15
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 claims abstract description 15
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000005303 weighing Methods 0.000 claims description 29
- 238000000227 grinding Methods 0.000 claims description 25
- 238000001354 calcination Methods 0.000 claims description 23
- 238000003825 pressing Methods 0.000 claims description 21
- 239000004568 cement Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims 1
- 238000005245 sintering Methods 0.000 abstract description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 abstract description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 2
- 239000001569 carbon dioxide Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 25
- 238000010438 heat treatment Methods 0.000 description 16
- 239000012153 distilled water Substances 0.000 description 14
- 238000003756 stirring Methods 0.000 description 12
- 238000005507 spraying Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 238000007664 blowing Methods 0.000 description 6
- 229910052681 coesite Inorganic materials 0.000 description 6
- 229910052593 corundum Inorganic materials 0.000 description 6
- 229910052906 cristobalite Inorganic materials 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 229910052682 stishovite Inorganic materials 0.000 description 6
- 229910052905 tridymite Inorganic materials 0.000 description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000008187 granular material Substances 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003892 spreading Methods 0.000 description 4
- 230000007480 spreading Effects 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 230000002045 lasting effect Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000008213 purified water Substances 0.000 description 3
- 230000000979 retarding effect Effects 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000011398 Portland cement Substances 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 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
- 239000011083 cement mortar Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 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
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910001678 gehlenite Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 1
- 235000019976 tricalcium silicate Nutrition 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- 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
- C04B7/00—Hydraulic 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention provides an early strength special cementing material and a preparation method thereof, the used raw materials are limestone, clay, iron powder, apatite, bauxite, fly ash, mineral powder, gypsum and silica fume which are widely existed in the nature, the sintering temperature is low, and the emission of carbon dioxide is less. The early strength type special cementing material provided by the invention can be used for reducing the consumption of limestone resources and improving the mechanical property and durability of the traditional silicate cementing material.
Description
Technical Field
The invention belongs to the field of building materials. In particular to an early strength special cementing material and a preparation method thereof.
Background
At present, the cement used in domestic and foreign building engineering is mainly traditional portland cement, and the cement yield in China is close to 1/3 of the total yield in the world. As a developing country, the demand of the sustainable development of national economy of China on cement is still greatly increased, and the cement industry is still the industry with high consumption, low efficiency, poor environmental compatibility and high environmental cost.
In China, special cement is adopted as a cementing material in some special projects and special components, and remarkable achievement is achieved, but the development of the special cement at present mainly has two problems: the production is low, the industrial structure is imperfect, and the rapid hardening early strength type special cementing material is less.
The early-strength special cementing material is a sustainable development cement variety with quick hardening, early strength, high quality, low consumption, high efficiency and good environmental compatibility, so that the research on the preparation and the performance of the early-strength special cementing material has important significance.
Disclosure of Invention
The invention aims to provide an early-strength special cementing material which has the characteristics of easily available raw materials, low cost, high early strength, quick setting time, high sulfate erosion resistance coefficient, excellent chloride ion permeability resistance and the like, and has important practical application value.
The invention also aims to provide a preparation method of the early strength special cementing material, which has low sintering temperature and simple preparation method.
The specific technical scheme of the invention is as follows:
an early strength special cementing material comprises the following raw materials in percentage by mass: 30-40% of cementing material A, 40-55% of cementing material B, 1-5% of gypsum, 1-5% of fly ash, 5-20% of mineral powder and 3-10% of silica fume;
the total content of the raw materials is 100 percent.
The cementing material A comprises the following raw materials in percentage by mass: 80-90% of limestone, 5-10% of clay and 2-5% of iron powder; the total content of the raw materials is 100 percent.
Raw materials of the cementing material A provide CaO, MgO and Fe2O3、Al2O3、SiO2And oxides are added, under the condition of the mixture ratio, the main minerals of the generated cementing material A are respectively tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite; the cementing material A is a silicate cementing material and mainly provides early and later strength.
The cementing material B comprises the following raw materials in percentage by mass: 40-50% of limestone, 30-50% of bauxite and 10-30% of apatite; the total content of the raw materials is 100 percent.
The raw material of the cementing material B provides CaO, MgO and P2O5、Al2O3、SiO2And oxides are added, and under the condition of the mixture ratio, the main minerals of the generated cementing material B are respectively calcium monoaluminate, calcium dialuminate, dodecacalcium heptaluminate, calcium phosphoaluminate solid solution and gehlenite.
The preparation method of the cementing material A comprises the following steps:
a1, limestone, clay and iron powder are crushed and ground to obtain powder;
a2, adding water into the powder to prepare wet raw materials, and pressing;
and A3, calcining.
Crushing in the step A1 to obtain particles with the diameter of less than 5 mm; the crushing to 5mm or less is to make the ball mill more easily grind, and if the crushing is not performed in advance, the grinding effect is deteriorated. And the particle size of the particles which are crushed and kept in the ball mill is kept uniform.
The grinding in the step A1 refers to: weighing 80-90% of crushed limestone, 5-10% of clay and 2-5% of iron powder according to mass percent, and placing the materials in a ball mill for grinding; grinding to 80 μm sieve residue of less than 1.5 wt%.
In the step A2, water accounting for 5-15% of the total mass of the powder is added into the ground powder, and the mixture is uniformly stirred to prepare wet raw materials;
the water is distilled water;
in step a2, the pressing means: weighing 100g of the wet raw materials each time, and pressing into a round cake-shaped material by adopting a 50-100 mm round die under the pressure of 20-40 MPa. The pressing is to make the powder material contact more closely and the solid phase reaction is more sufficient in the calcining process.
Calcining in the step A3, namely placing the pressed raw materials in a muffle furnace, and preserving the heat for 1-4h at 1400-1450 ℃ in an air atmosphere; and preserving the heat for 1-4 h.
In the step A3, heating from room temperature to 1400-1450 ℃ at a heating rate of 5 ℃/min;
in step A3, the material was removed after calcination and air cooled.
The preparation method of the cementing material B comprises the following steps:
b1, crushing limestone, bauxite and apatite, and grinding to obtain powder;
b2, adding water into the powder material to prepare wet raw materials, and pressing;
and B3, calcining.
Crushing in the step B1 to obtain particles with the diameter of less than 5 mm;
the grinding in the step B1 refers to: weighing 40-50% of crushed limestone, 30-50% of bauxite and 10-30% of apatite according to mass percentage, and placing the materials in a ball mill for grinding; grinding to 80 μm screen residue of less than 1.5 wt%.
In the step B2, water accounting for 5-15% of the total mass of the powder is added into the ground powder, and the mixture is uniformly stirred to prepare wet raw materials;
the water is distilled water;
in step B2, the pressing means: weighing 100g of the wet raw materials each time, and pressing into a round cake-shaped material by adopting a 50-100 mm round die under the pressure of 20-40 MPa.
B3, calcining, namely placing the pressed raw materials in a muffle furnace, and preserving the temperature for 1-4h at 1380-1420 ℃ in the air atmosphere; the resulting cement B was calcined.
In the step B3, heating from room temperature to 1380-1420 ℃ at a heating rate of 5 ℃/min;
and in the step B3, taking out the material after calcination, spraying with water while turning for 1-1.2min, spreading the material after spraying is finished, and naturally drying the material by utilizing waste heat.
The raw materials meet the following requirements:
limestone, CaO mass content is more than or equal to 46 wt%, MgO mass content is less than or equal to 2.0 wt%;
clay, SiO2Mass content is more than or equal to 70 wt%, and Al2O3The mass content is more than or equal to 12 wt%;
iron powder, Fe2O3The mass content is more than or equal to 35 wt%;
bauxite, Al2O3The mass content is more than or equal to 80wt percent, and SiO is2The mass content is more than or equal to 10 wt%;
apatite, P2O5Mass content is more than or equal to 30 wt%, SiO2The mass content is less than or equal to 10 wt%;
gypsum, SO3The mass content is 38-45 wt%;
fly ash, ignition loss less than or equal to 5.0 wt%, SO3The mass content is less than or equal to 3.0 wt%, the water requirement ratio is less than or equal to 105%, and the 45 mu m fineness sieve residue is less than or equal to 30 wt%;
mineral powder with grade not less than S95 and specific surface area not less than 400m2Per g, the amorphous content is more than or equal to 85 wt%;
silica fume with water content not more than 3.0 wt%, water requirement not more than 120 wt% and activity index not less than 105 wt%;
the invention provides a preparation method of an early strength special cementing material, which comprises the following steps:
mixing and grinding the cementing material A, the cementing material B, gypsum, fly ash, mineral powder and silica fume according to the formula ratio to obtain the cement.
And crushing the gelled material A and the gelled material B before grinding to obtain particles smaller than 5mm, and grinding.
Further, the grinding means: grinding in a ball mill until 80 μm of screen residue is less than 1.5 wt%.
The raw materials of the components of the invention have the following functions:
and (3) a cementing material A: providing early strength and late strength, the reaction product C-S-H gel is the primary source of strength.
And (3) a cementing material B: provides early strength while improving the sulfate erosion resistance coefficient and the chloride ion penetration resistance.
The cementing material A and the cementing material B respectively exert respective gelatinization to provide early and later strength, and simultaneously, hydration products react with gypsum to produce ettringite, thereby not only playing a role in retarding coagulation, but also improving the early strength. The effect of the fly ash and the mineral powder is to consume hydroxide in hydration products, generate strength and improve the durability of the cementing material.
Gypsum: the calcium aluminate cement has the function of retarding coagulation, and reacts with the cementing material A and the cementing material B to generate ettringite which has the function of retarding coagulation.
Fly ash: reduce early hydration heat, have the ball effect and the volcanic ash activity, are beneficial to enhancing the flowing property of the cementing material and improving the later strength.
Mineral powder: reduce early hydration heat, have higher activity and improve the strength of the cementing material.
Silica fume: the particles are small, the compactness of the cementing material is improved, the volcanic ash effect is achieved, and the strength can be improved.
The raw materials used by the invention are limestone, clay, iron powder, apatite, bauxite, fly ash, mineral powder, gypsum and silica fume which are widely available in nature, the sintering temperature is low, and the emission of carbon dioxide is low. The early-strength special cementing material provided by the invention can be used for reducing the consumption of limestone resources and improving the mechanical property and durability of the traditional silicate cementing material, and is used for special engineering, such as rapid road repair. The heavy metal ion adsorption material is used in marine environment, and can adsorb heavy metal ions and solidify the heavy metal ions.
Compared with the existing cementing material, the early-strength special cementing material prepared by the invention has the characteristics of quick hardening, early strength, high sulfate erosion resistance coefficient and strong chloride ion penetration resistance, and has wide market application prospect.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The specific techniques or conditions not specified in the examples can be performed according to the techniques or conditions described in the literature in the field or according to the product specification.
The raw materials of the invention meet the following requirements:
the raw materials meet the following requirements:
limestone, CaO mass content is more than or equal to 46 wt%, MgO mass content is less than or equal to 2.0 wt%;
clay, SiO2Mass content is more than or equal to 70 wt%, and Al2O3The mass content is more than or equal to 12 wt%;
iron powder, Fe2O3The mass content is more than or equal to 35 wt%;
bauxite, Al2O3The mass content is more than or equal to 80wt percent, and SiO is2The mass content is more than or equal to 10 wt%;
apatite, P2O5Mass content is more than or equal to 30 wt%, SiO2The mass content is less than or equal to 10 wt%;
gypsum, SO3The mass content is 38-45 wt%;
fly ash, ignition loss less than or equal to 5.0 wt%, SO3The mass content is less than or equal to 3.0 wt%, the water requirement ratio is less than or equal to 105%, and the 45 mu m fineness sieve residue is less than or equal to 30 wt%; finger-shaped
Mineral powder with grade not less than S95 and specific surface area not less than 400m2Per g, the amorphous content is more than or equal to 85 wt%;
silica fume with water content not more than 3.0 wt%, water requirement not more than 120 wt% and activity index not less than 105 wt%;
example 1
A preparation method of an early strength special cementing material comprises the following steps:
step one, preparing 5kg of a cementing material A: weighing 4.40kg of limestone, 0.45kg of clay and 0.15kg of iron powder; grinding the raw materials into particles with the particle size of less than 5mm in a ball mill until the sieve residue with the particle size of 80 mu m is less than 1.5 wt%, adding distilled water accounting for 10% of the total mass of the raw materials into the ground raw materials, uniformly stirring, weighing 100g of the obtained wet raw materials each time, and pressing into a round cake-shaped material under the pressure of 30MPa by adopting a 70mm round die. The round cake-shaped material is placed in a muffle furnace, and is heated from room temperature to 1450 ℃ for 2h at the heating rate of 5 ℃/min in the air atmosphere. And after calcining and sintering, taking out the materials, and blowing the materials in the air by using an electric fan to cool.
Step two, preparing 5kg of the cementing material B: 2.35kg of limestone, 2.00kg of bauxite and 0.65kg of apatite are weighed, particles of which the raw materials are crushed to be less than 5mm are put into a ball mill to be ground until the 80 mu m screen residue is less than 1.2 wt%. Adding distilled water accounting for 15% of the total mass of the ground powdery raw materials into the ground powdery raw materials, uniformly stirring, weighing 100g of wet raw materials each time, and pressing into a round cake-shaped material under the pressure of 30MPa by adopting a 70mm round die. The cake-shaped material is placed in a muffle furnace, the round cake-shaped material is heated from room temperature by adopting the heating rate of 5 ℃/min, and the round cake-shaped material is heated to 1400 ℃ and is kept warm for 2 h. And (3) taking out the material after calcining, spraying the material by using a spraying pot filled with purified water, turning the material by using an iron shovel, lasting for about 1min in the whole process, spreading the material after spraying is finished, and naturally drying the material by using waste heat.
Weighing 3.0kg of the cementing material A, 5.0kg of the cementing material B, 0.3kg of gypsum, 0.2kg of fly ash, 1.0kg of mineral powder and 0.5kg of silica fume, crushing the prepared cementing material A and the prepared cementing material B to particles with the particle size of less than 5mm for later use.
Step four), placing the raw materials prepared in the step three) into a ball mill to be ground until the 80-micron screen residue is less than 1.5%, and preparing the early-strength special cementing material.
Example 2
A preparation method of an early strength special cementing material comprises the following steps:
step one, preparing 5kg of a cementing material A: weighing 4.25kg of limestone, 0.50kg of clay and 0.25kg of iron powder; the granules of each raw material crushed to less than 5mm are put into a ball mill for grinding until 80 mu m of screen residue is less than 1.5 wt%. Adding distilled water accounting for 8% of the total mass of the ground powdery raw materials into the ground powdery raw materials, uniformly stirring, weighing 100g of wet raw materials each time, and pressing into a round cake-shaped material under the pressure of 25MPa by adopting a 80mm round die. The cake-shaped material is placed in a muffle furnace, heated from room temperature at a heating rate of 5 ℃/min in the air atmosphere, heated to 1435 ℃ and kept for 3 hours. And after calcining and sintering, taking out the materials, and blowing the materials in the air by using an electric fan to cool.
Step two, preparing 5kg of the cementing material B: 2.00kg of limestone, 2.50kg of bauxite and 0.50kg of apatite are weighed, particles of which the raw materials are crushed to be less than 5mm are put into a ball mill to be ground until the 80 mu m screen residue is less than 1.5 wt%. Adding distilled water accounting for 14% of the total mass of the ground powdery raw materials into the ground powdery raw materials, uniformly stirring, weighing 100g of wet raw materials each time, and pressing into a round cake-shaped material under the pressure of 25MPa by adopting a 80mm round die. The round cake-shaped material is placed in a muffle furnace, the round cake-shaped material is heated from room temperature by adopting the heating rate of 5 ℃/min, and the round cake-shaped material is heated to 1410 ℃ and is kept for 3 hours. And (3) taking out the material after calcining, spraying the material by using a spraying pot filled with purified water, turning the material by using an iron shovel, lasting for about 1min in the whole process, spreading the material after spraying is finished, and naturally drying the material by using waste heat.
Weighing 3.2kg of the cementing material A, 5.3kg of the cementing material B, 0.2kg of gypsum, 0.3kg of fly ash, 0.6kg of mineral powder and 0.4kg of silica fume, crushing the prepared cementing material A and the prepared cementing material B to particles with the particle size of less than 5mm for later use.
Step four, placing the raw materials prepared in the step three) into a ball mill to be ground until the 80 mu m screen residue is less than 1.5 wt%, and preparing the early-strength special cementing material.
Example 3
A preparation method of an early strength special cementing material comprises the following steps:
step one, preparing 5kg of a cementing material A: weighing 4.45kg of limestone, 0.35kg of clay and 0.20kg of iron powder; the granules of each raw material crushed to less than 5mm are put into a ball mill for grinding until 80 mu m of screen residue is less than 1.5 wt%. Adding distilled water accounting for 12% of the total mass of the ground powdery raw materials into the ground powdery raw materials, uniformly stirring, weighing 100g of wet raw materials each time, and pressing into a round cake-shaped material under the pressure of 35MPa by adopting a 75mm round die. The cake-shaped material is placed in a muffle furnace, heated from room temperature by adopting the heating rate of 5 ℃/min, heated to 1440 ℃ and kept for 3 h. And after calcining and sintering, taking out the materials, and blowing the materials in the air by using an electric fan to cool.
Step two, preparing 5kg of the cementing material B: 2.15kg of limestone, 1.95kg of bauxite and 0.90kg of apatite are weighed, particles of which the raw materials are crushed to be less than 5mm are put into a ball mill to be ground until the 80 mu m screen residue is less than 1.5 wt%. Adding distilled water accounting for 14% of the total mass of the ground powdery raw materials into the ground powdery raw materials, uniformly stirring, weighing 100g of wet raw materials each time, and pressing into a round cake-shaped material under the pressure of 35MPa by adopting a 80mm round die. The cake-shaped material is placed in a muffle furnace, the round cake-shaped material is heated from room temperature by adopting the heating rate of 5 ℃/min, and the round cake-shaped material is heated to 1390 ℃ and is kept warm for 2 h. And (3) taking out the material after calcining, spraying the material by using a spraying pot filled with purified water, turning the material by using an iron shovel, lasting for about 1min in the whole process, spreading the material after spraying is finished, and naturally drying the material by using waste heat.
Weighing 3.8kg of the cementing material A, 4.8kg of the cementing material B, 0.4kg of gypsum, 0.2kg of fly ash, 0.5kg of mineral powder and 0.3kg of silica fume, crushing the prepared cementing material A and the prepared cementing material B to particles with the particle size of less than 5mm, and keeping the materials for later use.
Step four), placing the raw materials prepared in the step three) into a ball mill to be ground until the allowance of the 80-micron sieve is less than 1.5%, and preparing the early-strength special cementing material.
Comparative example 1
A preparation method of the cementing material comprises the following steps:
step one, preparing 5kg of a cementing material A: weighing 3.50kg of limestone, 0.75kg of clay and 0.75kg of iron powder; the granules of each raw material crushed to less than 5mm are put into a ball mill for grinding until 80 mu m of screen residue is less than 1.5 wt%. Adding distilled water accounting for 10% of the total mass of the ground powdery raw materials into the ground powdery raw materials, uniformly stirring, weighing 150g of wet raw materials each time, and pressing into a round cake-shaped material under the pressure of 35MPa by adopting a 70mm round die. The cake-shaped material is placed in a muffle furnace, the round cake-shaped material is heated from room temperature by adopting the heating rate of 5 ℃/min, and the round cake-shaped material is heated to 1440 ℃ and is kept for 2 h. And after calcining and sintering, taking out the materials, and blowing the materials in the air by using an electric fan to cool.
Step two, preparing 5kg of the cementing material B: 1.65kg of limestone, 2.95kg of bauxite and 0.40kg of apatite are weighed, particles of which the raw materials are crushed to be less than 5mm are put into a ball mill for grinding until the 80 mu m screen residue is less than 1.5 wt%. Adding distilled water accounting for 15% of the total mass of the ground powdery raw materials into the ground powdery raw materials, uniformly stirring, weighing 150g of wet raw materials each time, and pressing into a round cake-shaped material under the pressure of 35MPa by adopting a 80mm round die. The cake-shaped material is placed in a muffle furnace, the round cake-shaped material is heated from room temperature by adopting the heating rate of 5 ℃/min, and the round cake-shaped material is heated to 1390 ℃ and is kept warm for 2 h. And (5) after calcining, taking out the material, and cooling the material in the air by using an electric fan.
Weighing 2.0kg of cementing material A, 7.0kg of cementing material B and 1.0kg of fly ash, crushing the prepared cementing material A and the prepared cementing material B to particles smaller than 5mm for later use.
Step four), placing the raw materials prepared in the step three) into a ball mill to be ground until 80 microns of screen residue is less than 1.5%, and preparing the cementing material.
Comparative example 2
A preparation method of the cementing material comprises the following steps:
step one, preparing 5kg of a cementing material A: weighing 3.25kg of limestone, 1.25kg of clay and 0.50kg of iron powder; the granules of each raw material crushed to less than 5mm are put into a ball mill for grinding until 80 mu m of screen residue is less than 1.5 wt%. Adding distilled water accounting for 10% of the total mass of the ground powdery raw materials into the ground powdery raw materials, uniformly stirring, weighing 100g of wet raw materials each time, and pressing into a round cake-shaped material under the pressure of 15MPa by adopting a 70mm round die. The cake-shaped material is placed in a muffle furnace, the round cake-shaped material is heated from room temperature by adopting the heating rate of 5 ℃/min, and the round cake-shaped material is heated to 1440 ℃ and is kept for 2 h. And after calcining and sintering, taking out the materials, and blowing the materials in the air by using an electric fan to cool.
Step two, preparing 5kg of the cementing material B: 1.00kg of limestone, 3.75kg of bauxite and 0.25kg of apatite are weighed, particles of which the raw materials are crushed to be less than 5mm are put into a ball mill for grinding until the 80 mu m screen residue is less than 1.5 wt%. Adding distilled water accounting for 20% of the total mass of the ground powdery raw materials into the ground powdery raw materials, uniformly stirring, weighing 100g of wet raw materials each time, and pressing into a round cake-shaped material under the pressure of 30MPa by adopting a 70mm round die. The cake-shaped material is placed in a muffle furnace, the round cake-shaped material is heated from room temperature by adopting the heating rate of 5 ℃/min, and the round cake-shaped material is heated to 1400 ℃ and is kept warm for 2 h. And (5) after calcining, taking out the material, and cooling the material in the air by using an electric fan.
Weighing 2.5kg of the cementing material A, 6.5kg of the cementing material B, 1.4kg of gypsum and 0.2kg of mineral powder 0.4kg of silica fume, and crushing the prepared cementing material A and the prepared cementing material B to particles smaller than 5mm for later use.
Step four), placing the raw materials prepared in the step three) into a ball mill to be ground until 80 microns of screen residue is less than 1.5%, and preparing the cementing material.
Comparative example 3
A preparation method of the cementing material comprises the following steps:
step one, preparing 5kg of a cementing material A: weighing 4.75kg of limestone, 0.20kg of clay and 0.05kg of iron powder; the granules of each raw material crushed to less than 5mm are put into a ball mill for grinding until 80 mu m of screen residue is less than 1.5 wt%. Adding distilled water accounting for 10% of the total mass of the ground powdery raw materials into the ground powdery raw materials, uniformly stirring, weighing 150g of wet raw materials each time, and pressing into a round cake-shaped material under the pressure of 15MPa by adopting a 70mm round die. The cake-shaped material is placed in a muffle furnace, the round cake-shaped material is heated from room temperature by adopting the heating rate of 5 ℃/min, and the round cake-shaped material is heated to 1400 ℃ and is kept warm for 2 h. And after calcining and sintering, taking out the materials, and blowing the materials in the air by using an electric fan to cool.
Step two, preparing 5kg of the cementing material B: 3.25kg of limestone, 1.40kg of bauxite and 0.35kg of apatite are weighed, particles of which the raw materials are crushed to be less than 5mm are put into a ball mill to be ground until the 80 mu m screen residue is less than 1.5 wt%. Adding distilled water accounting for 20% of the total mass of the ground powdery raw materials into the ground powdery raw materials, uniformly stirring, weighing 150g of wet raw materials each time, and pressing into a round cake-shaped material under the pressure of 30MPa by adopting a 70mm round die. The cake-shaped material is placed in a muffle furnace, heated from room temperature by adopting the heating rate of 5 ℃/min, heated to 1350 ℃ and kept for 2 h. And (5) after calcining, taking out the material, and cooling the material in the air by using an electric fan.
Step three, weighing 5.5kg of the cementing material A, 3.0kg of the cementing material B, 0.6kg of gypsum, 0.6kg of fly ash and 0.1kg of mineral powder, crushing the prepared cementing material A and the prepared cementing material B to particles with the particle size of less than 5mm for later use.
Step four), placing the raw materials prepared in the step three) into a ball mill to be ground until 80 microns of screen residue is less than 1.5%, and preparing the cementing material.
Comparison of the effects:
in order to evaluate the performance of the early-strength special cementing material, the setting time is detected by referring to GB/T1346 Cement Standard consistency Water consumption, setting time and stability, the mechanical performance is detected by referring to GB/T17671 Cement mortar Strength inspection method (ISO method), the cement chloride ion diffusion coefficient is detected by referring to JC/T1086-. The results are shown in table 1 below.
TABLE 1 comparison of the Performance of the examples and comparative examples
As can be seen from the table, the early strength type special cementing material prepared by the invention has far higher 3d strength and 28d strength than the comparative example cementing material, and has the advantages of fast setting time, excellent sulfate erosion resistance coefficient and excellent chloride ion diffusion resistance coefficient.
The above description is only a preferred embodiment of the present invention and should not be taken as limiting the invention, and any modification, equivalent replacement and improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The early-strength special cementing material is characterized by comprising the following raw materials in percentage by mass: 30-40% of a cementing material A, 40-55% of a cementing material B, 1-5% of gypsum, 1-5% of fly ash, 5-20% of mineral powder and 3-10% of silica fume;
the cementing material A comprises the following raw materials in percentage by mass: 80-90% of limestone, 5-10% of clay and 2-5% of iron powder;
the cementing material B comprises the following raw materials in percentage by mass: 40-50% of limestone, 30-50% of bauxite and 10-30% of apatite.
2. The early strength special cementing material of claim 1, wherein the preparation method of said cementing material A is as follows:
a1, limestone, clay and iron powder are crushed and ground to obtain powder;
a2, adding water into the powder to prepare wet raw materials, and pressing;
and A3, calcining.
3. The early strength special cement as claimed in claim 2, wherein the grinding in step A1 is: weighing 80-90% of crushed limestone, 5-10% of clay and 2-5% of iron powder according to mass percent, and placing the materials in a ball mill for grinding; grinding to 80 μm sieve residue of less than 1.5 wt%.
4. The early strength special cementing material of claim 2 or 3, wherein in step A2, water with the mass of 5-15% of the powder is added into the ground powder, and the mixture is stirred uniformly to prepare a wet raw material.
5. The early strength special cementing material according to any one of the claims 2 to 4, characterized in that, in the calcination in step A3, the pressed raw material is placed in a muffle furnace, and the temperature is kept between 1400 ℃ and 1450 ℃ for 1 to 4 hours under the air atmosphere; .
6. The early strength special cementing material of claim 1, wherein said cementing material B is prepared by the following steps:
b1, crushing limestone, bauxite and apatite, and grinding to obtain powder;
b2, adding water into the powder material to prepare wet raw materials, and pressing;
and B3, calcining.
7. The early strength special cementing material of claim 6, wherein in step B2, water with the mass of 5% -15% of the powder is added into the ground powder, and the mixture is stirred uniformly to prepare a wet raw material.
8. The early strength specialty cementitious material of claim 6 or 7,
and B3, calcining, namely placing the pressed raw materials in a muffle furnace, and preserving the heat for 1-4 hours at 1380-1420 ℃ in the air atmosphere.
9. The preparation method of the early strength special cementing material according to any one of claims 1 to 8, characterized in that the cementing material A, the cementing material B, the gypsum, the fly ash, the mineral powder and the silica fume with the formula amount are mixed and ground to obtain the early strength special cementing material.
10. The method of claim 9, wherein the milling is to 80 μm screen residue of less than 1.5 wt%.
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| CN104743944A (en) * | 2013-12-27 | 2015-07-01 | 胡长庚 | Novel energy-saving consumption-reducing dry-process cement clinker and preparation method thereof |
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