CN113526881A - High-performance environment-friendly cement and production method thereof - Google Patents

High-performance environment-friendly cement and production method thereof Download PDF

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Publication number
CN113526881A
CN113526881A CN202010308449.XA CN202010308449A CN113526881A CN 113526881 A CN113526881 A CN 113526881A CN 202010308449 A CN202010308449 A CN 202010308449A CN 113526881 A CN113526881 A CN 113526881A
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China
Prior art keywords
cement
mixed material
smaller
clinker
particle size
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CN202010308449.XA
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Chinese (zh)
Inventor
曹龙
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Zhengzhou Wuwei Powder Technology Co ltd
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Zhengzhou Wuwei Powder Technology Co ltd
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Priority to CN202010308449.XA priority Critical patent/CN113526881A/en
Publication of CN113526881A publication Critical patent/CN113526881A/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/02—Portland cement
    • C04B7/04—Portland cement using raw materials containing gypsum, i.e. processes of the Mueller-Kuehne type
    • 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
    • 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
    • C04B28/08—Slag cements
    • C04B28/082—Steelmaking slags; Converter slags
    • 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
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • 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
    • C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
    • C04B2111/00293—Materials impermeable to liquids
    • 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
    • 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
    • C04B2111/90—Electrical properties
    • C04B2111/94—Electrically conducting 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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention provides a high-performance environment-friendly cement and a production method thereof, wherein the cement raw material comprises 0-50% of Portland cement clinker, 45-85% of mixed material, 5-15% of gypsum and 0.0-0.6% of polycarboxylic acid high-efficiency water-reducing grinding aid (solid content), the particle size of the cement clinker, the gypsum and part of the mixed material is smaller than (D97=60 micrometers), the particle size of part of the mixed material is smaller than (D97=20 micrometers), and the water demand ratio of standard fluidity saturation point of cement mortar is smaller than 0.3. The invention adopts subversive method different from traditional method to improve cement product and manufacturing process, changes the research on the influence of chemical property, mud, clinker mineral composition and burning on the cement property into the research on the influence of physical property, water, mixed material property and grinding on the cement property, and provides an effective high-performance environment-friendly cement and production method.

Description

High-performance environment-friendly cement and production method thereof
Technical Field
The invention relates to the field of building materials, in particular to high-performance environment-friendly cement and a production method thereof.
Background
As is well known, portland cement as a building material is widely applied to various fields of national economy and plays an important basic role in the improvement of human civilization. According to statistics, 120kg of standard coal and 65 kilowatt-hour electricity are consumed when one ton of portland cement clinker is produced in the world in 2018, and the energy consumption is huge. And when one ton of cement clinker is produced, about 1 ton of carbon dioxide is averagely discharged, and the carbon dioxide released in the production process of the cement clinker accounts for about 7% of the total amount of the carbon dioxide generated by human beings. And the concrete prepared by the portland cement has the following disadvantages: the common strength can only reach about 1/2 of the aggregate strength, the impermeability, the corrosion resistance, the alkali-aggregate reaction resistance and the poor interface transition region can not meet the durability requirement of concrete for more than 50 years, and the bleeding property, the segregation property and the filling property can not meet the construction property requirement of pumping self-leveling concrete.
Disclosure of Invention
The invention aims to solve the problems that pollution is caused by the large amount of cement clinker applied in the prior art and the performance of concrete prepared by the prior portland cement is low.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the high-performance environment-friendly cement comprises, by weight, 0% -50% of portland cement clinker, 45% -85% of mixed materials, 5% -15% of gypsum and 0.0% -0.6% of polycarboxylic acid high-efficiency water-reducing grinding aid (solid content), wherein the particle sizes of the cement clinker, the gypsum and part of the mixed materials are smaller than (D97=60 micrometers), the particle size of part of the mixed materials (accounting for more than 30% of the total weight of the cement) is smaller than (D97=20 micrometers), and the water quantity ratio of standard fluidity saturation point of cement mortar is smaller than 0.3.
A production method of high-performance environment-friendly cement comprises the following steps: the mixed material accounting for more than 30 percent of the total weight of the cement and the polycarboxylic acid high-efficiency water-reducing grinding aid are mixed according to the formula amount and then are independently ground until the particle size is smaller than (D97=20 microns), the rest mixed material, the clinker, the gypsum and the polycarboxylic acid high-efficiency water-reducing grinding aid are mixed according to the formula amount and then are independently ground until the particle size is smaller than (D97=60 microns), and finally, the mixed material and the polycarboxylic acid high-efficiency water-reducing grinding aid are uniformly mixed according to the formula amount to obtain a finished product.
It should be noted that the "saturation point" in the present application is defined as follows: the research experiment shows that in cement paste, mortar and concrete, as the water reducing agent is increased, a point exists at which the water reducing rate is not reduced obviously after the water reducing agent is added, the point is called a "saturation point", the water reducing rate at the time is called a "saturation point water reducing rate", the adding amount at the time is called a "saturation point adding amount", the water demand at the time is called a "saturation point water demand", the water demand ratio at the time is called a "saturation point water demand ratio", and the cement mortar standard fluidity water demand ratio at the time is called a "cement mortar standard fluidity saturation point water demand ratio".
It should be noted that in the present application, "(D97 =60 μm)" indicates 97% by weight of 60 μm or less, and "(D97 =20 μm)" indicates 97% by weight of 20 μm or less, and the like.
It should be noted that the clinker is the conventional portland cement clinker, the performance of the clinker is required to meet the requirements of national standards of the country on the portland cement clinker, the mixed material is the conventional mixed material, the performance of the mixed material is required to meet all kinds of mixed materials in the national standards of the country on the portland cement or concrete, the gypsum is the conventional gypsum, the performance of the gypsum is required to meet all kinds of gypsum in the national standards of the country on the portland cement or concrete, and the water reducing grinding aid is the conventional water reducing grinding aid, and the performance of the water reducing grinding aid is required to meet all kinds of water reducing grinding aids in the national standards of the country on the portland cement or concrete.
The invention has the beneficial effects that:
researches and practices find that pumping self-leveling concrete does not generate obvious bleeding, the segregated cement must have more than 80% and less than 20 microns of particles, otherwise, the self-filling property of the self-leveling concrete cannot be realized, and when the conventional cement mixing and grinding method is used for producing the cement with the particles with the particle size of more than 80% and less than 20 microns, the water demand of the cement is greatly increased, the aging strain is poor, the cost of the concrete is greatly increased, and the quality is reduced. The cement separate grinding process is adopted, clinker, gypsum and part of mixed materials are independently ground to the particle size smaller than (D97=60 microns), and part of mixed materials (accounting for more than 30% of the total weight of the cement) are independently ground to the particle size smaller than (D97=20 microns) and then are uniformly mixed, so that the problem is solved, and the following unexpected effects are found.
1. The small-particle-size mixed material greatly reduces the bleeding and segregation of concrete, greatly improves the filling property of the concrete, and the properties are the construction property requirements necessary for pumping the self-leveling concrete and the properties which cannot be realized by the conventional portland cement.
2. The small-particle-size mixed material is filled in the gaps of the large-particle-size portland cement, occupies the space of the original water, improves the sphericity of the small-particle-size mixed material, increases the lubricating effect of cement paste, consequently improves the water reducing rate of the standard fluidity saturation point of cement mortar to more than 40 percent, and reduces the water consumption of the concrete saturation point to 120kg/m3This is also a property that cannot be achieved by conventional portland cements, below.
3. The mixed material with small particle size meets four conditions of improving the interface of concrete aggregate, 1 reduces the surface tension of water, 2 increases the viscosity of the concrete, 3 has a certain proportion of siliceous material and calcareous material, and 4 has basically the same hydration speed as the siliceous material and the calcareous material, which is the performance which can not be realized by the conventional portland cement.
4. Due to the improvement of the concrete constructability, the reduction of the single water consumption and the improvement of the interface, the 3-day compressive strength of the concrete is improved by 3-4 times, the 28-day compressive strength is improved by more than 2 times, the concrete strength exceeds the aggregate strength, and the limit of the concrete strength is reached.
5. Because the water consumption of the concrete is reduced, the interface is improved, the calcium-silicon ratio is reasonable, the strength and the impermeability of the set cement are higher than those of the aggregate, the durability of the concrete is higher than that of the aggregate, and the concrete is realized for thousands of years.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention is further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Firstly, four groups of cement 1, 2, 3 and 4 are set, wherein the cement 1 is the traditional portland cement, and the cement 2, 3 and 4 are different embodiments of the high-performance environment-friendly cement provided by the invention.
Then four groups of cement are respectively prepared, and the performance parameters are recorded to prepare a table-1, and the No. 1 and No. 4 cement are prepared into concrete and the corresponding concrete performance parameters are recorded to prepare a table-2.
Reading the table-1, comparing with the cement with serial numbers 1, 2, 3 and 4, it can be seen that the correlation between the cement strength and clinker content in the cement is not large, this finding overturns the concept that the traditional portland cement is classified according to the clinker content in the cement and the clinker mineral composition is considered to determine the cement performance, because the main energy consumption and environmental pollution in the traditional cement industry are from clinker firing heat and calcium carbonate decomposition, the clinker content in the cement is reduced, the energy consumption and carbon dioxide emission in the cement industry are fundamentally reduced, and simultaneously, a large amount of industrial waste residues in other industries can be comprehensively utilized. It can also be seen that no matter what raw material, proportion and particle size of cement are changed, the influence on the cement strength is not more than 60mpa, but the water quantity ratio required for changing the standard fluidity of cement mortar is less than 0.25, so that the 3-day strength of the cement can be improved by more than 3 times to 90mpa, and the 28-day strength can reach 120mpa, that is, the influence of water on the cement performance is great, but the cost is low, and the influence of mud on the cement performance is limited, but the cost is great.
Reading table-2, comparing the concrete prepared by the traditional portland cement with the serial number 1 and the high-performance environment-friendly cement with the serial number 4, it can be seen that the traditional portland cement with the serial number 1 cannot meet the construction requirement of the pumping self-leveling concrete, and the durability of the concrete cannot meet all the performance requirements of the national standard on the concrete with the durability of 50 years under the most severe environmental conditions. The serial number 4 high-performance environment-friendly cement can completely meet the construction requirement of pumping self-leveling concrete due to the small-particle-size mixed material, and the small-particle-size mixed material is filled in gaps of large-particle-size clinker, so that the sphericity of the small-particle-size mixed material is improved, the lubricating effect of cement paste is increased, the single-component water consumption of the concrete is reduced by (160-120) =40kg, the 28-day strength of the concrete is increased by (123-76) =47mpa, the strength of the concrete exceeds the strength of aggregate, the strength limit of the concrete is reached, and the durability of the concrete exceeds the full performance requirement of the national standard on the concrete with the durability of 100 years under the most severe environmental conditions.
TABLE-1
Figure DEST_PATH_IMAGE002
Watch-2
Figure DEST_PATH_IMAGE004
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.

Claims (2)

1. The high-performance environment-friendly cement is characterized in that: the cement raw material (weight ratio) comprises 0-50% of Portland cement clinker, 45-85% of mixed material, 5-15% of gypsum and 0.0-0.6% of polycarboxylic acid high-efficiency water-reducing grinding aid (solid content), wherein the particle size of the cement clinker, the gypsum and part of the mixed material is smaller than (D97=60 micrometers), the particle size of part of the mixed material (accounting for more than 30% of the total weight of the cement) is smaller than (D97=20 micrometers), and the water demand ratio of standard fluidity saturation point of cement mortar is smaller than 0.3.
2. The high-performance environment-friendly cement as claimed in claim 1, wherein: the production method of the high-performance environment-friendly cement comprises the following steps: the mixed material and the polycarboxylic acid high-efficiency water-reducing grinding aid which account for more than 30 percent of the total weight of the cement are taken according to the formula amount and are independently ground until the particle size is smaller than (D97=20 microns), the rest mixed material, the clinker, the gypsum and the polycarboxylic acid high-efficiency water-reducing grinding aid are independently ground until the particle size is smaller than (D97=60 microns) after being mixed according to the formula amount, and finally, the mixed material and the polycarboxylic acid high-efficiency water-reducing grinding aid are uniformly mixed according to the formula amount to obtain the finished product.
CN202010308449.XA 2020-04-18 2020-04-18 High-performance environment-friendly cement and production method thereof Pending CN113526881A (en)

Priority Applications (1)

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CN202010308449.XA CN113526881A (en) 2020-04-18 2020-04-18 High-performance environment-friendly cement and production method thereof

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Application Number Priority Date Filing Date Title
CN202010308449.XA CN113526881A (en) 2020-04-18 2020-04-18 High-performance environment-friendly cement and production method thereof

Publications (1)

Publication Number Publication Date
CN113526881A true CN113526881A (en) 2021-10-22

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03199145A (en) * 1989-12-28 1991-08-30 Sumitomo Cement Co Ltd Globular slag cement and its production
CN1143053A (en) * 1995-08-16 1997-02-19 曹龙 Process for producing high strength multifunctional cement
CN1144203A (en) * 1995-08-30 1997-03-05 曹龙 High speed crushing cement and its producing method
CN1238312A (en) * 1998-06-08 1999-12-15 曹龙 High-efficiency cement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03199145A (en) * 1989-12-28 1991-08-30 Sumitomo Cement Co Ltd Globular slag cement and its production
CN1143053A (en) * 1995-08-16 1997-02-19 曹龙 Process for producing high strength multifunctional cement
CN1144203A (en) * 1995-08-30 1997-03-05 曹龙 High speed crushing cement and its producing method
CN1238312A (en) * 1998-06-08 1999-12-15 曹龙 High-efficiency cement

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