CN114772955B - High-performance cement and preparation method and application thereof - Google Patents
High-performance cement and preparation method and application thereof Download PDFInfo
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- CN114772955B CN114772955B CN202210411065.XA CN202210411065A CN114772955B CN 114772955 B CN114772955 B CN 114772955B CN 202210411065 A CN202210411065 A CN 202210411065A CN 114772955 B CN114772955 B CN 114772955B
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- 239000004568 cement Substances 0.000 title claims abstract description 110
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000004567 concrete Substances 0.000 claims abstract description 74
- 239000002245 particle Substances 0.000 claims abstract description 72
- 239000000463 material Substances 0.000 claims abstract description 26
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 25
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 238000000576 coating method Methods 0.000 claims abstract description 17
- 239000011362 coarse particle Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 14
- 238000012216 screening Methods 0.000 claims description 13
- 239000003469 silicate cement Substances 0.000 claims description 8
- 239000011398 Portland cement Substances 0.000 claims description 7
- -1 polyethylene Polymers 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 239000005060 rubber Substances 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 3
- 235000012241 calcium silicate Nutrition 0.000 claims description 3
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 3
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 229910021534 tricalcium silicate Inorganic materials 0.000 claims description 3
- 235000019976 tricalcium silicate Nutrition 0.000 claims description 3
- 230000036571 hydration Effects 0.000 abstract description 13
- 238000006703 hydration reaction Methods 0.000 abstract description 13
- 238000005336 cracking Methods 0.000 abstract description 9
- 238000007873 sieving Methods 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 239000010419 fine particle Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/02—Portland cement
-
- 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
-
- 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
- C04B7/368—Obtaining spherical cement particles
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses high-performance cement and a preparation method and application thereof, wherein fine cement particles smaller than 10 mu m and coarse cement particles larger than 10 mu m are obtained by sieving cement, wherein the particles with particle diameters smaller than 10 mu m account for 8% -25% of the weight of the cement, the particles with particle diameters smaller than 25 mu m account for 45% -60% of the weight of the cement, and the particles with particle diameters smaller than 70 mu m account for 96% -100% of the weight of the cement; coating thermoplastic resin materials on the surfaces of fine cement particles smaller than 10 mu m, wherein the coating area is 50% -70%; the fine cement particles coated with the thermoplastic resin material are cooled and then mixed with the coarse particles again to form the high-performance cement. The cement prepared by the invention has the advantages of good fluidity, low hydration heat, small volume shrinkage, high toughness and high crack resistance, can resist natural environment and high-speed train fatigue load without cracking, and can be used in high-speed railway ballastless track, bridge and tunnel concrete.
Description
Technical Field
The invention relates to the technical field of cement-based composite materials, in particular to high-performance cement and a preparation method and application thereof.
Background
The ballastless track structure has the characteristics of high stability, good smoothness, less maintenance and repair quantity and the like, and is a foundation for safe, high-speed and comfortable operation of a high-speed train. The ballastless track structure in a strip shape in service is subjected to natural environment effects such as rain and snow, ultraviolet rays, temperature change and the like, high-frequency fatigue vibration of a high-speed train and the constraint effect of other structural components, so that the phenomenon of premature degradation of part of the ballastless track structure is caused, and the ballastless track structure mainly comprises the following components: (1) the ballastless track plate has large brittleness, and is easy to crack and fall in the construction and operation period; (2) the cast-in-situ ballastless track bed plate has high cracking risk, and splayed cracks and transverse through cracks are easy to occur; (3) diseases such as tiny cracks, transverse through cracks and the like often occur on the cast-in-situ base plate, and along with the extension of service life, concrete cracking tends to increase year by year; cracking also occurs in railway tunnels and bridge concrete works due to higher hydration temperature rise, and greater shrinkage of the concrete mass.
Cracking is the most important factor affecting the durability of the reinforced concrete structure, and after the concrete cracks, external aggressive media are easier to invade the inside of the concrete to cause corrosion of the steel bars, thereby accelerating the degradation of the reinforced concrete structure. Cement is a key component material of concrete, cement hydration can lead to shrinkage deformation of concrete mass, the deformation coordination of the concrete which is coagulated and hardened is poor, cement particles are finer and finer to meet the requirements of engineering construction, the early strength of the concrete is higher when the particles are finer, but the elastic modulus is also increased, and the concrete is easier to crack.
The current common method for improving the crack resistance of the concrete is to add mineral admixtures such as fly ash, slag and the like into the concrete or change the composition of cement to improve C in the cement 2 S content, as in patent CN 106587670A; these measures can reduce the strength of concrete and the elastic modulusThe development rate of the concrete is increased, the cracking time is delayed, but the brittleness of the concrete is not changed, and once the concrete is deformed, the concrete is easy to crack; in order to improve the brittleness of the concrete and improve the toughness of the concrete, the technicians also mix materials such as polymer emulsion or rubber powder, and the like, and mix polymer materials to reduce the brittleness of the concrete and improve the deformation performance of the concrete, but after mixing the polymer materials, the compressive strength of the concrete is reduced to some extent, and the ballastless track structure is high-strength concrete, so that the compressive strength reduction is difficult to meet the use requirement of the ballastless track structure.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides high-performance cement and a preparation method and application thereof.
The first object of the present invention is to provide a high-performance cement, which is Portland cement;
the silicate cement comprises 8-25% of particles with particle size smaller than 10 μm, 45-60% of particles with particle size smaller than 25 μm, and 96-100% of particles with particle size smaller than 70 μm;
wherein, the surface of the cement particle smaller than 10 mu m is coated with the thermoplastic resin material, and the coating area is 50% -70%.
As a further improvement of the present invention, the thermoplastic resin material includes one or more of polyethylene, polyvinyl chloride, polyurethane, polystyrene, polymethyl methacrylate, polycarbonate, polytetrafluoroethylene, and rubber.
As a further improvement of the invention, the silicate cement contains 30-45% of tricalcium silicate, 20-30% of dicalcium silicate, 5-10% of gypsum and 20-30% of mineral admixture.
As a further improvement of the invention, the specific surface area of the high-performance cement formed by mixing after coating is 200m 2 /kg~260m 2 /kg。
The second object of the present invention is to provide a method for preparing high-performance cement, comprising:
screening the Portland cement to obtain fine cement particles smaller than 10 mu m and coarse cement particles larger than 10 mu m;
fine cement particles smaller than 10 mu m enter a jet flow tower, so that the thermoplastic resin material atomized particles in suspension in the jet flow tower are coated with the fine cement particles;
the fine cement particles coated with the thermoplastic resin material are cooled and then mixed with the coarse particles again to form the high-performance cement.
As a further improvement of the invention, the melting atomization temperature of the thermoplastic resin material is 300-450 ℃, and the diameter of atomized particles is 0.01-0.2 mu m.
As a further improvement of the invention, the screening mode is as follows: and screening the silicate cement by adopting a high-speed centrifugal winnowing machine or a high-efficiency screening machine.
As a further improvement of the invention, the cooling mode is as follows: the high-speed cold air and the coated particles form convection, and the temperature is reduced from 300-450 ℃ to below 150 ℃ within 3 min.
As a further improvement of the invention, the mixing mode is as follows: the mixing speed is 800-1000 rad/min, and the coagulation time is 3-5 min.
A third object of the present invention is to provide the use of high-performance cement for the preparation of high-speed railway runner bed slab, foundation slab and ballastless track slab concrete, railway tunnel and bridge concrete and highway pavement concrete and airport pavement concrete.
Compared with the prior art, the invention has the beneficial effects that:
the cement prepared by the invention coats a thin layer of thermoplastic resin on the surface of fine cement particles smaller than 10 mu m, so that the prepared cement has the advantages of good fluidity, low hydration heat, small water demand, small volume shrinkage, high toughness and high crack resistance, and can resist natural environment action and high-speed train fatigue load action without cracking; meanwhile, the cement can be used for high-speed railway ballastless track, bridge and tunnel concrete, and can also be suitable for highway engineering and airport pavement concrete.
Drawings
FIG. 1 is a flow chart of a method for preparing high performance cement according to one embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is described in further detail below with reference to the attached drawing figures:
cement is a main raw material of concrete, plays a role in strength and cementation in the concrete, and the performance of the cement directly influences the performance of the concrete. However, cement hydration generates volume shrinkage, hydration products are brittle and have poor deformability, the ballastless track is of a long and large sheet-shaped structure, one surface of the ballastless track, which is subjected to direct sunlight, is greatly deformed, and the shrinkage deformation of concrete is added, so that the long and large sheet-shaped concrete is easy to crack due to poor coordination ability of the concrete deformation; in addition, the ballastless track directly bears high-frequency dynamic load transferred by the upper train, under the action of dynamic load, the original cracks are easy to expand, so that the degradation of concrete is gradually aggravated, the service life of the ballastless track structure is finally reduced, and the high-performance cement and the preparation method and application thereof are provided for meeting the requirements of the concrete structure of the high-speed railway engineering and realizing the low shrinkage, high crack resistance and high toughness of the concrete.
Research results show that the cement grain composition has an important effect on the concrete performance, so that the bleeding of the concrete is reduced to meet the requirements of the working performance and early mechanical properties of the concrete, and the grain size of the cement is finer and finer, especially the grain size smaller than 10 mu m is more and more; because the finer the cement particles, the faster the hydration and the higher the early strength. From the development history of cement in the last 30 years, the grain size of the cement is finer and finer, the 3d compressive strength of the prepared concrete is higher and higher, but the brittleness of the concrete prepared by finer cement is higher, which is the cause of easy cracking of the concrete; in addition, the ballastless track is of a special structure, and can bear fatigue impact fatigue load of a high-speed train for a long time, so that concrete prepared from the cement is easier to crack. Therefore, the invention starts from the cement particle grading, solves the main problems of the existing cement by modifying the fine particles, and has the main technical characteristics and ideas as follows:
1. refining and screening:
the cement with the particle size of more than 10 mu m and less than 10 mu m in the ordinary Portland cement is separated by high-efficiency screening or centrifugal winnowing technology, the cement particles with the particle size of less than 10 mu m have great influence on the working performance and mechanical properties of concrete, a series of problems such as segregation, bleeding and the like of the concrete are directly caused by the lack of the powder particles, and the cement is separated into two parts by a fine screening technology.
2. Surface coating, shrinkage reduction and toughening:
the thermoplastic resin material is coated on the surface of the cement particles below 10 mu m, the dispersibility of the cement particles is not changed after the thermoplastic resin material is coated on the surfaces of the cement particles, the workability of concrete is not affected, and only the surfaces are modified, so that the hydration rate of fine-particle cement is greatly slowed down, the water demand is reduced, and the volume shrinkage of the cement is reduced; in addition, the surface coating rate of the thermoplastic resin is 50% -70%, the cement still has certain activity, the development requirement of the concrete strength can be met, the deformation performance of the fine-particle cement after hydration is greatly improved after the surface coating of the resin material is most critical, the hydration heat is obviously reduced, the flexural strength is effectively improved, and the toughness of the concrete is greatly improved. The resin coated on the surface plays a good bridging role, so that the deformation coordination performance of the concrete is improved, and the cracking resistance of the concrete is obviously improved. The selection of the thermoplastic resin material is based on: the coating technology has the advantages that the coating technology is easy to melt, fine particles can be sprayed out to realize coating with cement, agglomeration and adhesion do not occur after the temperature is reduced, the good shape of cement particles can be kept, the compressive strength is not greatly influenced when the coating technology improves the flexural strength of concrete, the structural use is not influenced, and the compressive strength of the concrete is easily reduced when the thermoplastic resin material is directly doped into the cement by the conventional technology.
3. And (3) uniformly stirring and mixing for the second time:
the fine particles after surface coating are combined with the coarse particles again to form high-performance cement, the coarse particles and the fine particles are mixed and stirred at a high speed, the stirring speed is low, the stirring is insufficient, segregation is easy to occur in the storage process, the stirring of the concrete is uneven, the stirring speed is up to 800-1000 rad/min, and the stirring time is ensured to be 3-5 min.
The comprehensive application of the technology effectively realizes low water demand, low shrinkage, high toughness and high crack resistance of cement, the folding ratio can better reflect the toughness of concrete, and when the compressive strength is the same, the folding ratio is improved, and the toughness and the crack resistance of the concrete are improved.
Based on the above, the technical scheme of the invention is as follows:
the invention provides high-performance cement, which can be conventional silicate cement;
the silicate cement comprises 8-25% of particles with particle size smaller than 10 μm, 45-60% of particles with particle size smaller than 25 μm, and 96-100% of particles with particle size smaller than 70 μm; the surface of the cement particles smaller than 10 mu m is coated with the thermoplastic resin material, and the coating area is 50% -70%.
Wherein,,
the thermoplastic resin material comprises one or more of polyethylene, polyvinyl chloride, polyurethane, polystyrene, polymethyl methacrylate, polycarbonate, polytetrafluoroethylene and rubber; the silicate cement contains 30-45% of tricalcium silicate, 20-30% of dicalcium silicate, 5-10% of gypsum, 20-30% of mineral admixture and 5-15% of other components; the specific surface area of the high-performance cement formed by mixing after coating is 200m 2 /kg~260m 2 /kg。
As shown in fig. 1, the present invention provides a method for preparing high-performance cement, comprising:
screening the Portland cement by adopting one of a high-speed centrifugal winnowing machine or a high-efficiency screening machine to obtain fine cement particles smaller than 10 mu m and coarse cement particles larger than 10 mu m;
step 2, fine cement particles smaller than 10 mu m enter a jet flow tower, so that the thermoplastic resin material atomized particles in suspension in the jet flow tower are coated with the fine cement particles; wherein the melting atomization temperature of the thermoplastic resin material is 300-450 ℃, and the diameter of atomized particles is 0.01-0.2 mu m;
step 3, cooling the fine cement particles coated with the thermoplastic resin material, and mixing with the coarse particles again to form high-performance cement; wherein, the cooling mode is: the high-speed cold air and the coated particles form convection, and the temperature is reduced from 300 ℃ to 450 ℃ to below 150 ℃ within 3 min; the mixing mode is as follows: the mixing speed is 800-1000 rad/min, and the mixing time is 3-5 min.
The specific surface area of the high-performance cement prepared by the invention is 200m 2 /kg~260m 2 The initial setting time is 220-250 min, the final setting time is 300-340 mm, the water consumption of standard consistencies is 22-24%, the hydration heat of 7d is 110-130J/g, the shrinkage of 28d mortar rod is less than or equal to 750 mu epsilon, the 3d flexural strength is more than or equal to 4MPa, and the 3d compressive strength is more than or equal to 15MPa; the flexural strength of 7d is more than or equal to 9MPa, and the compressive strength of 7d is more than or equal to 30MPa; the 28d flexural strength is more than or equal to 12MPa, and the 28d compressive strength is more than or equal to 45MPa;56d flexural strength is more than or equal to 14MPa,56d compressive strength is more than or equal to 60MPa; the method is used for preparing concrete of a high-speed railway runner bed plate, a bed plate and a ballastless track plate, concrete of a railway tunnel and a bridge, concrete of a highway pavement and concrete of an airport pavement.
Examples 1 to 7
The cement gradations and the process parameters of examples 1 to 7 (S1 to S7) of the invention are shown in Table 1, and the cement properties of examples 1 to 7 are shown in Table 2.
TABLE 1
TABLE 2
Remarks:
1. the cement of the embodiment 1 and the embodiment 2 is mainly used for high-speed railway ballastless track concrete, and the ballastless track concrete is easy to shrink and crack and is required to shrink little.
2. The cements of examples 3 and 4 are mainly used for railway tunnel lining concrete, and the tunnel lining concrete is required to have low shrinkage of cement and low hydration heat.
3. The cement of the embodiment 5, the embodiment 6 and the embodiment 7 is mainly high-speed railway bridge concrete, the bridge concrete belongs to mass concrete, the hydration heat of the cement is required to be low, the shrinkage is small, and in addition, the flexural strength and the compressive strength are high; meanwhile, the cement can also be used for highway pavement concrete, and the pavement concrete has higher requirements on the flexural strength and the crack resistance of the cement.
Comparative examples 1 to 17
The cement gradations and the process parameters of comparative examples 1 to 17 (D1 to D17) are shown in Table 3, and the cement properties of comparative examples 1 to 17 are shown in Table 4.
TABLE 3 Table 3
TABLE 4 Table 4
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The high-performance cement is characterized in that the cement is Portland cement;
the silicate cement comprises 8-25% of particles with particle size smaller than 10 μm, 45-60% of particles with particle size smaller than 25 μm, and 96-100% of particles with particle size smaller than 70 μm; wherein,,
coating thermoplastic resin materials on the surfaces of cement particles smaller than 10 mu m, wherein the coating area is 50% -70%;
fine cement particles smaller than 10 mu m enter a jet flow tower, so that the thermoplastic resin material atomized particles in suspension in the jet flow tower are coated with the fine cement particles; the fine cement particles coated with the thermoplastic resin material are cooled and then mixed with the coarse particles again to form the high-performance cement.
2. The high performance cement of claim 1, wherein the thermoplastic resin material comprises one or more of polyethylene, polyvinyl chloride, polyurethane, polystyrene, polymethyl methacrylate, polycarbonate, polytetrafluoroethylene, and rubber.
3. The high-performance cement according to claim 1, wherein the tricalcium silicate content in the Portland cement is 30% -45% of the cement weight, the dicalcium silicate content is 20% -30% of the cement weight, the gypsum is 5% -10% of the cement weight, and the mineral admixture is 20% -30% of the cement weight.
4. The high-performance cement according to claim 1, wherein the specific surface area of the high-performance cement formed by mixing after coating is 200m 2 /kg~260m 2 /kg。
5. A method of preparing the high-performance cement according to any one of claims 1 to 4, comprising:
screening the Portland cement to obtain fine cement particles smaller than 10 mu m and coarse cement particles larger than 10 mu m;
fine cement particles smaller than 10 mu m enter a jet flow tower, so that the thermoplastic resin material atomized particles in suspension in the jet flow tower are coated with the fine cement particles;
the fine cement particles coated with the thermoplastic resin material are cooled and then mixed with the coarse particles again to form the high-performance cement.
6. The method according to claim 5, wherein the thermoplastic resin material has a melting and atomizing temperature of 300 ℃ to 450 ℃ and an atomized particle diameter of 0.01 μm to 0.2 μm.
7. The method of claim 5, wherein the screening method comprises: and screening the silicate cement by adopting a high-speed centrifugal winnowing machine or a high-efficiency screening machine.
8. The method of claim 5, wherein the cooling means is: the high-speed cold air and the coated particles form convection, and the temperature is reduced from 300-450 ℃ to below 150 ℃ within 3 min.
9. The method of claim 5, wherein the mixing means is: the mixing speed is 800-1000 rad/min, and the mixing time is 3-5 min.
10. Use of the high-performance cement according to any one of claims 1 to 4 for the preparation of high-speed railway runner bed slab, foundation slab and ballastless track slab concrete, railway tunnel and bridge concrete and highway pavement concrete and airport pavement concrete.
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| CN1181002C (en) * | 1998-06-08 | 2004-12-22 | 曹龙 | High-efficiency cement |
| CN103466974A (en) * | 2013-09-25 | 2013-12-25 | 句容联众科技开发有限公司 | High-performance cement as well as preparation method thereof |
| CN106186976B (en) * | 2016-07-14 | 2017-10-10 | 济南大学 | One kind condenses controllable type complex cement base sealing material and its application process |
| CN111689733B (en) * | 2020-06-10 | 2022-02-22 | 中铁二局集团有限公司 | Low-hydration-heat concrete and preparation method thereof |
| CN112321179B (en) * | 2020-11-30 | 2022-03-04 | 中建材中研益科技有限公司 | Weather-resistant low-heat cement and preparation method thereof |
| CN113416011A (en) * | 2021-07-31 | 2021-09-21 | 山西天润恒德新材料有限公司 | Mineralized material used in cement grinding process |
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