CN111875336A - High-strength gypsum cementing material based on anhydrite and limestone and preparation method thereof - Google Patents
High-strength gypsum cementing material based on anhydrite and limestone and preparation method thereof Download PDFInfo
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- CN111875336A CN111875336A CN202010815100.5A CN202010815100A CN111875336A CN 111875336 A CN111875336 A CN 111875336A CN 202010815100 A CN202010815100 A CN 202010815100A CN 111875336 A CN111875336 A CN 111875336A
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- anhydrite
- limestone
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- strength gypsum
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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
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/16—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 calcium sulfate cements containing anhydrite, e.g. Keene's 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
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Abstract
The invention discloses a high-strength gypsum cementing material based on anhydrite and limestone and a preparation method thereof, wherein the high-strength gypsum cementing material comprises the following raw material components in parts by weight: 60-70 parts of high-strength gypsum, 5-30 parts of anhydrite and 2-30 parts of limestone; the introduced anhydrite is a cementing material which can have higher strength only in a long age, the early strength can be obviously reduced due to the excessive amount of the incorporated anhydrite, but the strength is poor because the internal structure of the test block is not compact enough, and from the angle, limestone is introduced as an inorganic filler, and in a certain range, the gaps are filled with the fine limestone particles, so that the internal structure is more compact, and the early strength is higher.
Description
Technical Field
The invention relates to a high-strength gypsum cementing material based on anhydrite and limestone and a preparation method thereof.
Background
The alpha high-strength gypsum is obtained by steaming and pressing natural dihydrate gypsum under the condition of saturated steam with certain pressure, the water requirement of the standard consistency is generally between 20 and 35 percent, and the alpha high-strength gypsum has the advantages of high hardness, high strength, good wear resistance and the like, and is widely applied to the industries of aviation, medical treatment, high-end manufacturing and the like. The alpha high-strength gypsum needs less water for hardening, releases low heat in the hydration process, has strength far higher than that of beta building gypsum, but has limited yield and higher price because the process is more complex, the yield is far less than that of the building gypsum and the production cost is higher. The existing specialization is mainly directed at the introduction of high-strength gypsum on a certain aspect, materials such as cement, slag and the like are introduced into the high-strength gypsum, a certain amount of additives are added to adjust the workability, and the performance of the product is improved by utilizing the gelling activity of the materials. Because the introduced components are too complex, when slag, fly ash and other substances are introduced, the whiteness of the product is easily reduced greatly, and when more high-strength gypsum is replaced, the strength is obviously reduced. The strength in the early stage of hydration is mainly derived from the hydration of high-strength gypsum, and appropriate substances such as slag and the like can only play a role of dilution, so that the early strength is low, in the later stage of hydration, active substances such as slag and the like can continuously react to improve the performance of a system, but Al released by the reaction of the active substances, an exciting agent and the gypsum can generate ettringite, and if the proportion is not proper, a large amount of ettringite can cause the system to expand, so that the problems of cracking, pulverization and the like are caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention solves the problems that: the invention provides a high-strength gypsum cementing material which can obtain higher strength in a short age when more than forty percent of high-strength gypsum is substituted, and has no problem of volume stability, thereby solving the problems that the early strength is poor and the system stability is possibly generated in the later period when more high-strength gypsum is substituted by the existing modified high-strength gypsum powder, and reducing the use cost.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a high-strength gypsum cementing material based on anhydrite and limestone comprises the following raw material components in parts by weight: 60-70 parts of high-strength gypsum, 5-30 parts of anhydrite and 2-30 parts of limestone.
Furthermore, the high-strength gypsum is alpha-type high-strength gypsum, and the breaking strength of 2 hours is more than or equal to 6.0Mpa, and the drying compressive strength is more than or equal to 50.0 Mpa.
Further, the anhydrite is natural anhydrite or commercially available anhydrite.
A preparation method of a high-strength gypsum cementing material based on anhydrite and limestone comprises the following steps:
s1, selecting high-strength gypsum: selecting high-strength gypsum powder, and meeting the requirements that the breaking strength is more than or equal to 6.0Mpa after 2 hours and the drying compressive strength is more than or equal to 50.0 Mpa;
s2, grinding anhydrite: carrying out ball milling on the anhydrite by adopting a planetary ball mill to ensure that the specific surface area is 1170-7000 cm2/g；
S3, grinding limestone: performing ball milling on limestone by adopting a planetary ball mill to ensure that the specific surface area is 2500-2/g。
S4, mixing materials: and (3) mixing and stirring the high-strength gypsum powder, the ground anhydrite powder and the ground limestone powder uniformly to obtain the high-strength gypsum cementing material based on the anhydrite and the limestone.
Further, the high-strength gypsum powder in the step S1 is an α -type high-strength gypsum powder.
Further, in the step S2, the time for grinding the anhydrite is 1 to 2 hours.
Further, in the step S3, the time for grinding the limestone is 1 to 2 hours.
The invention has the advantages of
1. The invention can obtain powder with better performance by doping anhydrite and limestone with lower cost without other heating and pressurizing additional high-cost technologies.
2. The strength of the alpha-type high-strength gypsum used in the technology rises quickly in a short period, the introduced anhydrite is a cementing material which can have higher strength only in a long age, the early strength can be obviously reduced due to too much doped anhydrite, the strength difference is caused because the internal structure of a test block is not tight enough, and from the angle, limestone is introduced as an inorganic filler, and in a certain range, the gaps are filled with thinner limestone particles, so that the internal structure is more tight, and the early strength is higher.
Detailed Description
The present invention will be described in further detail below.
Example 1
A high-strength gypsum cementing material based on anhydrite and limestone comprises the following raw material components in parts by weight: 60 parts of high-strength gypsum, 10 parts of anhydrite and 30 parts of limestone; the high-strength gypsum is alpha-type high-strength gypsum, and meets the requirements that the breaking strength is more than or equal to 6.0Mpa after 2 hours and the drying compressive strength is more than or equal to 50.0 Mpa; further, the anhydrite is natural anhydrite.
A preparation method of a high-strength gypsum cementing material based on anhydrite and limestone comprises the following steps:
s1, selecting high-strength gypsum: high-strength gypsum powder is selected, and the flexural strength of the gypsum powder is more than or equal to 6.0Mpa after 2 hours, and the drying compressive strength of the gypsum powder is more than or equal to 50.0 Mpa. The high-strength gypsum powder is alpha-type high-strength gypsum powder.
S2, grinding anhydrite: the anhydrite is ball-milled by a planetary ball mill to ensure that the specific surface area is 1920cm2(ii) in terms of/g. The time for grinding the anhydrite was 1 h.
S3, grinding limestone: performing ball milling on limestone by adopting a planetary ball mill to ensure that the specific surface area is 2690cm2(ii) in terms of/g. The limestone grinding time is 1 h.
S4, mixing materials: and (3) mixing and stirring the high-strength gypsum powder, the ground anhydrite powder and the ground limestone powder uniformly to obtain the high-strength gypsum cementing material based on the anhydrite and the limestone.
Example 2
A high-strength gypsum cementing material based on anhydrite and limestone comprises the following raw material components in parts by weight: 70 parts of high-strength gypsum, 15 parts of anhydrite and 15 parts of limestone; the high-strength gypsum is alpha-type high-strength gypsum, and meets the requirements that the breaking strength is more than or equal to 6.0Mpa after 2 hours and the drying compressive strength is more than or equal to 50.0 Mpa; further, the anhydrite is commercially available anhydrite such as anhydrite produced by Anhui Taurus mining Co.
A preparation method of a high-strength gypsum cementing material based on anhydrite and limestone comprises the following steps:
s1, selecting high-strength gypsum: high-strength gypsum powder is selected, and the flexural strength of the gypsum powder is more than or equal to 6.0Mpa after 2 hours, and the drying compressive strength of the gypsum powder is more than or equal to 50.0 Mpa. The high-strength gypsum powder is alpha-type high-strength gypsum powder.
S2, grinding anhydrite: ball milling anhydrite by adopting a planetary ball mill to ensure that the specific surface area is 1870cm2(ii) in terms of/g. The time for grinding the anhydrite was 2 h.
S3, grinding limestone: carrying out ball milling on limestone by adopting a planetary ball mill to ensure that the specific surface area is 2500cm2(ii) in terms of/g. The limestone grinding time is 2 h.
S4, mixing materials: and (3) mixing and stirring the high-strength gypsum powder, the ground anhydrite powder and the ground limestone powder uniformly to obtain the high-strength gypsum cementing material based on the anhydrite and the limestone.
Example 3
A high-strength gypsum cementing material based on anhydrite and limestone comprises the following raw material components in parts by weight: 65 parts of high-strength gypsum, 30 parts of anhydrite and 5 parts of limestone; the high-strength gypsum is alpha-type high-strength gypsum, and meets the requirements that the breaking strength is more than or equal to 6.0Mpa after 2 hours and the drying compressive strength is more than or equal to 50.0 Mpa; further, the anhydrite is commercially available anhydrite such as anhydrite produced by Anhui Taurus mining Co.
A preparation method of a high-strength gypsum cementing material based on anhydrite and limestone comprises the following steps:
s1, selecting high-strength gypsum: high-strength gypsum powder is selected, and the flexural strength of the gypsum powder is more than or equal to 6.0Mpa after 2 hours, and the drying compressive strength of the gypsum powder is more than or equal to 50.0 Mpa. The high-strength gypsum powder is alpha-type high-strength gypsum powder.
S2, grinding anhydrite: the anhydrite is ball-milled by a planetary ball mill so that the specific surface area is 1240cm2(ii) in terms of/g. The time for grinding the anhydrite was 1 h.
S3, grinding limestone: carrying out ball milling on limestone by adopting a planetary ball mill to ensure that the specific surface area is 3250cm2(ii) in terms of/g. The limestone grinding time is 2 h.
S4, mixing materials: and (3) mixing and stirring the high-strength gypsum powder, the ground anhydrite powder and the ground limestone powder uniformly to obtain the high-strength gypsum cementing material based on the anhydrite and the limestone.
Example 4
A high-strength gypsum cementing material based on anhydrite and limestone comprises the following raw material components in parts by weight: 60 parts of high-strength gypsum, 30 parts of anhydrite and 10 parts of limestone; the high-strength gypsum is alpha-type high-strength gypsum, and meets the requirements that the breaking strength is more than or equal to 6.0Mpa after 2 hours and the drying compressive strength is more than or equal to 50.0 Mpa; further, the anhydrite is commercially available anhydrite such as anhydrite produced by Anhui Taurus mining Co.
A preparation method of a high-strength gypsum cementing material based on anhydrite and limestone comprises the following steps:
s1, selecting high-strength gypsum: high-strength gypsum powder is selected, and the flexural strength of the gypsum powder is more than or equal to 6.0Mpa after 2 hours, and the drying compressive strength of the gypsum powder is more than or equal to 50.0 Mpa. The high-strength gypsum powder is alpha-type high-strength gypsum powder.
S2, grinding anhydrite: the anhydrite is ball-milled by a planetary ball mill to ensure that the specific surface area is 3397cm2(ii) in terms of/g. The time for grinding the anhydrite was 1 h.
S3, grinding limestone: performing ball milling on limestone by using a planetary ball mill to ensure that the specific surface area is 4179cm2(ii) in terms of/g. The limestone grinding time is 1 h.
S4, mixing materials: and (3) mixing and stirring the high-strength gypsum powder, the ground anhydrite powder and the ground limestone powder uniformly to obtain the high-strength gypsum cementing material based on the anhydrite and the limestone.
The results of the performance tests of the high-strength gypsum-based binder obtained in the above examples are shown in the following table.
From the experimental data, the 2h flexural strength of the cementing material provided by the invention is basically up to about 5.0MPa through the introduced anhydrite and limestone and the synergistic effect of the anhydrite and the limestone.
The anhydrite is a cementing material which can have higher strength only in a long age, the early strength can be obviously reduced due to the excessive amount of the incorporated anhydrite, but the strength is poor because the internal structure of the test block is not tight enough, and from the angle, limestone is introduced as an inorganic filler, and in a certain range, the gaps are filled with the thinner limestone particles, so that the internal structure is more tight, and the early strength is higher.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The high-strength gypsum cementing material based on anhydrite and limestone is characterized by comprising the following raw material components in parts by weight: 60-70 parts of high-strength gypsum, 5-30 parts of anhydrite and 2-30 parts of limestone.
2. The anhydrite and limestone based high-strength gypsum cementing material as claimed in claim 1, characterized in that the high-strength gypsum is alpha type high-strength gypsum, and meets the requirements that the flexural strength is more than or equal to 6.0MPa within 2 hours and the drying compressive strength is more than or equal to 50.0 MPa.
3. Anhydrite and limestone based high-strength gypsum cement according to claim 1, characterized in that the anhydrite is natural anhydrite or commercially available anhydrite.
4. A preparation method of a high-strength gypsum cementing material based on anhydrite and limestone is characterized by comprising the following steps:
s1, selecting high-strength gypsum: selecting high-strength gypsum powder, and meeting the requirements that the breaking strength is more than or equal to 6.0Mpa after 2 hours and the drying compressive strength is more than or equal to 50.0 Mpa;
s2, grinding anhydrite: carrying out ball milling on the anhydrite by adopting a planetary ball mill to ensure that the specific surface area is 1170-7000 cm2/g；
S3, grinding limestone: limestone is ball milled by a planetary ball millBall milling is carried out by the ball mill, so that the specific surface area is 2500-2/g。
S4, mixing materials: and (3) mixing and stirring the high-strength gypsum powder, the ground anhydrite powder and the ground limestone powder uniformly to obtain the high-strength gypsum cementing material based on the anhydrite and the limestone.
5. The method for preparing a high-strength gypsum cementing material based on anhydrite and limestone as claimed in claim 4, wherein the high-strength gypsum powder in the step S1 is alpha-type high-strength gypsum powder.
6. The method for preparing a high-strength gypsum cementing material based on anhydrite and limestone as claimed in claim 4, wherein the grinding time of the anhydrite in the step S2 is 1-2 h.
7. The method for preparing a high-strength gypsum cementing material based on anhydrite and limestone as claimed in claim 4, wherein the grinding time of limestone in the step S3 is 1-2 h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112562471B (en) * | 2020-12-03 | 2023-09-19 | 西安医学院 | Manufacturing method of children oral teaching operation model |
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