CN112479610A - Low-heat corrosion-resistant portland cement and preparation method thereof - Google Patents
Low-heat corrosion-resistant portland cement and preparation method thereof Download PDFInfo
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- CN112479610A CN112479610A CN202011394552.7A CN202011394552A CN112479610A CN 112479610 A CN112479610 A CN 112479610A CN 202011394552 A CN202011394552 A CN 202011394552A CN 112479610 A CN112479610 A CN 112479610A
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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
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
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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
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
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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
- C04B7/36—Manufacture of hydraulic cements in general
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses low-heat corrosion-resistant portland cement and a preparation method thereof. The paint comprises the following components in parts by weight: 60-70 parts of calcium silicate cement clinker, 5-10 parts of gypsum, 5-10 parts of bentonite, 5-10 parts of fly ash, 10-15 parts of slag, 1-5 parts of mineralizer, 5-10 parts of silica sand and 0.1-1 part of carbon nano tube. The early strength of the Portland cement prepared by the method is well improved, and the Portland cement has good corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of cement preparation, and particularly relates to low-heat corrosion-resistant portland cement and a preparation method thereof.
Background
With the development of material science and building technology, the concrete technology enters a high-tech era, and the design concept of concrete is developed from simple strength grade design to design emphasizing structural durability. NIST and ACI of the USA in 1990The theory of High Performance Concrete (HPC) will be proposed for the first time. According to the theory, the high-performance concrete has three technical characteristics of high workability, high strength and high durability. In order to achieve the purpose, strict control must be comprehensively carried out from correct selection of raw materials, optimal matching of process parameters and reasonable application of a construction process. The cement is used as a main cementing material of concrete, and the quality of the performance of the cement is crucial to the performance of the concrete. For general portland cement, the high calcium mineral C is contained in large amount3S and more C3Further improvement of the safety of concrete has some drawbacks that are difficult to overcome: for example, the concrete slump loss is fast and the construction performance is poor; the hydration heat is high, and temperature difference cracks are easy to generate when the concrete volume is large; the dry shrinkage value is high, and dry shrinkage cracks are easy to generate; ca (OH) with secondary reaction capability in cement hydration products2Higher content, poor chemical resistance, etc. The low-heat portland cement prepared with high belite clinker, corresponding coagulation regulating component and the like is a novel high-performance cement developed for realizing high performance of concrete
The low-heat silicate cement has lower hydration heat, lower shrinkage rate and higher durability than common silicate cement and moderate-heat cement, the prepared concrete has reduced dryness, high breaking strength, lower adiabatic temperature rise by 5-10 ℃ than moderate-heat cement concrete, and the comprehensive crack resistance is far better than that of the common cement concrete. However, due to the characteristics of mineral composition, the existing low-heat silicate cement has the problems of insufficient early strength, insufficient corrosion resistance and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the low-heat corrosion-resistant portland cement and the preparation method thereof, and can effectively solve the problem of insufficient early strength of the existing fly ash portland cement.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
the low-heat-corrosion-resistance portland cement comprises the following components in parts by weight:
60-70 parts of calcium silicate cement clinker, 5-10 parts of gypsum, 5-10 parts of bentonite, 5-10 parts of fly ash, 10-15 parts of slag, 1-5 parts of mineralizer, 5-10 parts of silica sand and 0.1-1 part of carbon nano tube.
Further, the paint comprises the following components in parts by weight:
65 parts of calcium silicate cement clinker, 5 parts of gypsum, 5 parts of bentonite, 5 parts of fly ash, 10 parts of slag, 5 parts of silica sand and 0.8 part of carbon nano tube.
Further, the particle size of the slag is 1-15 μm.
Further, the mineralizer is SO3、P2O5、CaF2At least one of (1).
Further, the gypsum is natural gypsum or desulfurized gypsum.
The preparation method of the low-heat corrosion-resistant portland cement comprises the following steps of:
(1) mixing calcium silicate cement clinker, gypsum, silica sand and a mineralizer according to a formula, then grinding, adding bentonite, fly ash, slag and carbon nano tubes, and continuously grinding;
(2) and (2) stirring and mixing the product obtained in the step (1) with water, wherein the water-cement ratio is 0.3-0.5, and then carbonizing for 10-15 hours at 25-30 ℃ under the pressure of 0.1-1.0 MPa and the flow rate of carbon dioxide gas of 10-30 sccm.
Further, the carbonization temperature was 30 ℃, the pressure was 0.5MPa, and the gas flow rate was 18 sccm.
The invention has the beneficial effects that:
1. the cement is in an alkaline environment and can play a role in activating the activity of the fly ash, so that a volcanic ash reaction is generated to produce a hydrated gel product, and the strength of the prepared cement is improved. Meanwhile, the calcium bentonite is added into the formula, and the calcium bentonite has good dispersibility and can be filled into gaps generated in the cement preparation process, so that the cement slurry is more compact, the secondary hydration process can be accelerated, the consumption of calcium hydroxide is further accelerated, and the content of calcium hydroxide in the slurry is reduced.
2. The surface of the fly ash particles contains aluminosilicate glass bodies, which can be corroded in an alkaline environment, so that the surfaces of the fly ash particles generate holes, and the aluminosilicate glass bodies can be used as carriers of slag and other components, and can be filled into gaps of cement slurry while the pozzolan reaction is carried out. In addition, the bentonite is alkaline when dispersed in the cement paste, can further activate the fly ash and promote the aluminosilicate glass body on the surface of the fly ash to be corroded, and meanwhile, the bentonite is also of a multi-layer net structure, has good adsorption performance, can adsorb certain components such as slag and the like, is filled into a cement paste gap together with the components, and improves the early strength of the cement paste.
3. The carbon nano tube has nanometer diameter and length, can be filled into the fly ash, takes the fly ash as a carrier, and part of the carbon nano tube can also be directly filled into micropores of the cement paste to improve the compactness of the cement paste, thereby improving the early strength of the cement paste and resisting the infiltration of external aggressive ions. Meanwhile, the carbon nano tube has excellent mechanical property and good toughness, and when the cement paste generates expansive damage under the erosion of external ions, the carbon nano tube can effectively prevent cracks from generating, so that the corrosion resistance of the cement is further enhanced.
4. The calcium bentonite has good dispersibility, can be effectively dispersed into gaps of cement slurry in the preparation process, the erosion of cement also enters through tiny gaps existing in the slurry, the bentonite also has good adsorption performance, and when erosion ions enter the slurry through the gaps, the bentonite can adsorb certain erosion ions, so that the corrosion resistance of the cement slurry is effectively enhanced.
5. The application has still carried out carbonization, and in carbonization process, the base member can absorb carbon dioxide, generates calcium carbonate and silica gel, can further effectively improve the early strength of cement.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Example 1
The low-heat-corrosion-resistance portland cement comprises the following components in parts by weight:
65 parts of calcium silicate cement clinker, 5 parts of gypsum, 5 parts of calcium bentonite, 5 parts of fly ash, 10 parts of slag and P2O52 parts of silica sand, 5 parts of silica sand and 0.8 part of carbon nano tube.
The preparation method of the cement comprises the following steps:
(1) according to the formula, the calcium silicate cement clinker, natural gypsum, silica sand and P are mixed2O5Mixing, grinding, adding calcium bentonite, fly ash, slag and carbon nanotubes, and continuously grinding;
(2) and (2) stirring and mixing the product obtained in the step (1) with water, wherein the water-cement ratio is 0.3, and then carbonizing for 10 hours at 30 ℃, 0.6MPa and the carbon dioxide gas flow rate of 18 sccm.
Example 2
The low-heat-corrosion-resistance portland cement comprises the following components in parts by weight:
70 parts of calcium silicate cement clinker, 10 parts of natural gypsum, 10 parts of calcium bentonite, 10 parts of fly ash, 15 parts of slag and P2O55 parts of silica sand, 10 parts of silica sand and 1 part of carbon nano tube.
The preparation method of the cement comprises the following steps:
(1) according to the formula, the calcium silicate cement clinker, natural gypsum, silica sand and P are mixed2O5Mixing, grinding, adding calcium bentonite, fly ash, slag and carbon nanotubes, and continuously grinding;
(2) and (2) stirring and mixing the product obtained in the step (1) with water, wherein the water-cement ratio is 0.5, and then carbonizing for 15 hours at 30 ℃, 1.0MPa and the carbon dioxide gas flow rate of 30 sccm.
Example 3
The low-heat-corrosion-resistance portland cement comprises the following components in parts by weight:
65 parts of calcium silicate cement clinker, 5 parts of natural gypsum, 8 parts of calcium bentonite, 6 parts of fly ash, 12 parts of slag and P2O52 parts of silica sand, 6 parts of silica sand and 0.6 part of carbon nano tube.
The preparation method of the cement comprises the following steps:
(1) according to the formula, the calcium silicate cement clinker, natural gypsum, silica sand and P are mixed2O5Mixing, grinding, adding calcium bentonite, fly ash, slag and carbon nanotubes, and continuously grinding;
(2) and (2) stirring and mixing the product obtained in the step (1) with water, wherein the water-cement ratio is 0.3, and then carbonizing for 10 hours at 26 ℃, 0.1MPa and the carbon dioxide gas flow rate of 10 sccm.
Comparative example 1
Compared with the example 1, the calcium bentonite and the slag are absent in the formula, and the rest process is the same as the example 1.
Comparative example 2
Compared with the example 1, the carbon nano tube and the fly ash are absent in the formula, and the rest process is the same as the example 1.
Comparative example 3
Compared with example 1, the formulation lacks fly ash and slag, and the rest of the process is the same as example 1.
Comparative example 4
In comparison with example 1, the carbonization process was absent and the rest of the process was the same as example 1.
1. The cements obtained in examples 1 to 3 and comparative examples 1 to 4 were tested according to the requirements of GB/T17671-1999 Cement mortar Strength test method (ISO method) and GB/T12959-2008 Cement Heat of hydration test method, respectively, and the results are shown in Table 1.
TABLE 1 Cement Properties
2. The cement test pieces after curing for 28d, prepared in examples 1 to 3 and comparative examples 1 to 4, were immersed in a hydrochloric acid solution having a concentration of 5%, and changes in the compressive strength and tensile strength of the test pieces after immersion for different periods of time were measured, and the results are shown in table 2.
TABLE 2 Corrosion resistance of cement
As can be seen from the detection data in tables 1 and 2, the cement prepared by the method has good strength in the early stage and also has good corrosion resistance.
Claims (7)
1. The low-heat corrosion-resistant portland cement is characterized by comprising the following components in parts by weight:
60-70 parts of calcium silicate cement clinker, 5-10 parts of gypsum, 5-10 parts of calcium bentonite, 5-10 parts of fly ash, 10-15 parts of slag, 1-5 parts of mineralizer, 5-10 parts of silica sand and 0.1-1 part of carbon nano tube.
2. The low heat corrosion resistant portland cement of claim 1, comprising the following components in parts by weight:
65 parts of calcium silicate cement clinker, 5 parts of gypsum, 5 parts of calcium bentonite, 5 parts of fly ash, 10 parts of slag, 1-5 parts of mineralizer, 5 parts of silica sand and 0.8 part of carbon nano tube.
3. The low heat corrosion resistant portland cement of claim 1 or 2, wherein the slag has a particle size of 1 to 15 μm.
4. The low thermal corrosion resistant portland cement of claim 1 or 2, wherein the mineralizer is SO3、P2O5、CaF2At least one of (1).
5. The low heat and corrosion resistant portland cement of claim 1 or 2, wherein the gypsum is natural gypsum or desulfurized gypsum.
6. A method for preparing the low-heat corrosion-resistance portland cement of any one of claims 1 to 5, comprising the following steps:
(1) mixing calcium silicate cement clinker, gypsum, silica sand and a mineralizer according to a formula, then grinding, adding calcium bentonite, fly ash, slag and carbon nano tubes, and continuously grinding;
(2) and (2) stirring and mixing the product obtained in the step (1) with water, wherein the water-cement ratio is 0.3-0.5, and then carbonizing for 10-15 hours at 25-30 ℃ under the pressure of 0.1-1.0 MPa and the flow rate of carbon dioxide gas of 10-30 sccm.
7. The production method according to claim 6, wherein the carbonization temperature is 30 ℃, the pressure is 0.5MPa, and the gas flow rate is 18 sccm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011394552.7A CN112479610A (en) | 2020-12-03 | 2020-12-03 | Low-heat corrosion-resistant portland cement and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114538806A (en) * | 2022-03-17 | 2022-05-27 | 嘉华特种水泥股份有限公司 | Hydrated carbonized composite hardening cementing material based on steel slag and preparation method thereof |
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Patent Citations (4)
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| KR20000049749A (en) * | 2000-04-27 | 2000-08-05 | 정광식 | A solidifying agent composition of which chief ingredient is low exothermic cement and a preparing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114538806A (en) * | 2022-03-17 | 2022-05-27 | 嘉华特种水泥股份有限公司 | Hydrated carbonized composite hardening cementing material based on steel slag and preparation method thereof |
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