CN112876164A - Preparation method of high-strength cement - Google Patents
Preparation method of high-strength cement Download PDFInfo
- Publication number
- CN112876164A CN112876164A CN202110111695.0A CN202110111695A CN112876164A CN 112876164 A CN112876164 A CN 112876164A CN 202110111695 A CN202110111695 A CN 202110111695A CN 112876164 A CN112876164 A CN 112876164A
- Authority
- CN
- China
- Prior art keywords
- cement
- parts
- sand
- reducing agent
- water reducing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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- 239000004568 cement Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000000835 fiber Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 24
- 239000000945 filler Substances 0.000 claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 21
- 239000011398 Portland cement Substances 0.000 claims abstract description 20
- 239000000654 additive Substances 0.000 claims abstract description 20
- 230000000996 additive effect Effects 0.000 claims abstract description 20
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004698 Polyethylene Substances 0.000 claims abstract description 13
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 13
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 13
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 13
- 239000000440 bentonite Substances 0.000 claims abstract description 13
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 13
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 13
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 13
- 239000003365 glass fiber Substances 0.000 claims abstract description 13
- 239000010440 gypsum Substances 0.000 claims abstract description 13
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 13
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 13
- -1 polyethylene Polymers 0.000 claims abstract description 13
- 229920000573 polyethylene Polymers 0.000 claims abstract description 13
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000002893 slag Substances 0.000 claims abstract description 13
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- 239000010936 titanium Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 20
- 238000012423 maintenance Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000011802 pulverized particle Substances 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical group O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction 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
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of high-strength cement, which comprises the following raw materials of portland cement, sand, an improvement additive, a filler and a water reducing agent, wherein the improvement additive comprises glass fiber, polyethylene fiber, polyvinyl alcohol fiber and carbon nano tubes, the filler comprises kaolin, diatomite, bentonite, titanium slag and gypsum powder, and the weight parts of the portland cement, the sand, the improvement additive, the filler and the water reducing agent are 100 parts of the portland cement, 250 parts of the sand, 3-5 parts of the improvement additive, 7-10 parts of the filler and 1 part of the water reducing agent. According to the invention, the toughness of cement is changed through the carbon nano tube, the glass fiber, the polyethylene fiber and the polyvinyl alcohol fiber with different elastic moduli are mixed and added to a crack expansion area uniformly distributed in the cement to slow down the expansion of cracks and increase the flexural strength, and kaolin, diatomite, bentonite, titanium slag and gypsum powder are used as fillers to be uniformly filled into the cement to increase the wear resistance and strength of the cement.
Description
Technical Field
The invention relates to the technical field of cement production, in particular to a preparation method of high-strength cement.
Background
The cement is a powdery hydraulic inorganic cementing material, and can be made into plastic slurry after adding a proper amount of water, so that the cement can be hardened in the air and the water, and can firmly cement materials such as sand, stone and the like together. As an important cementing material, the high-performance cement is widely applied to engineering such as civil construction, water conservancy, national defense and the like for a long time. The existing finished cement generally has the problems of low strength after solidification, easy cracking and increased maintenance cost, so that the improvement of the strength of the cement has important significance.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
The present invention is directed to a method for preparing high strength cement, which solves the above problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of high-strength cement comprises the following steps of preparing raw materials of the high-strength cement by using portland cement, sand, an improvement additive, a filler and a water reducing agent, wherein the improvement additive comprises glass fibers, polyethylene fibers, polyvinyl alcohol fibers and carbon nano tubes, the filler comprises kaolin, diatomite, bentonite, titanium slag and gypsum powder, and the portland cement, the sand, the improvement additive, the filler and the water reducing agent are prepared from 100 parts by weight of the portland cement, 250 parts by weight of the sand, 3-5 parts by weight of the improvement additive, 7-10 parts by weight of the filler and 1 part by weight of the water reducing agent, and the preparation method comprises the following steps:
step (1): weighing portland cement, sand, an improvement additive, a filling agent and a water reducing agent according to the weight part ratio;
step (2): placing kaolin, bentonite, gypsum powder, diatomite and titanium slag in a pulverizer to pulverize and mix at the rotation speed of 120 plus 150r/min until the particle size diameter of the pulverized particles is 0.5-1mm, so as to obtain a mixture A;
and (3): the mixture A, glass fiber, polyethylene fiber, polyvinyl alcohol fiber and carbon nano tube are placed in a mixer to be fully mixed, the mixing speed is 120-;
and (4): placing the Portland cement, the sand, the water reducing agent and the mixture B in a spiral stirrer for mixing, wherein the stirring time is 45 minutes, pouring the mixture into a mold for constant-temperature maintenance after stirring, the maintenance time is 20 days, the maintenance temperature in the first 10 days is 45 ℃, and the maintenance temperature in the last 10 days is 32 ℃, so that the high-strength cement can be obtained.
Furthermore, the weight part ratio of the glass fiber, the polyethylene fiber, the polyvinyl alcohol fiber and the carbon nano tube is 2:2:2: 1.
Further, the weight part ratio of the kaolin to the diatomite to the bentonite to the titanium slag to the gypsum powder is 3:1:3:2: 1.
Further, the water reducing agent is a naphthalene water reducing agent.
Further, the particle size diameter obtained in the step (2) is 0.6 mm.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the toughness of cement is changed through the carbon nano tube, the glass fiber, the polyethylene fiber and the polyvinyl alcohol fiber with different elastic moduli are mixed and added to a crack expansion area uniformly distributed in the cement to slow down the expansion of cracks and increase the flexural strength, and kaolin, diatomite, bentonite, titanium slag and gypsum powder are used as fillers to be uniformly filled into the cement to increase the wear resistance and strength of the cement.
Detailed Description
The invention will be further described with reference to specific embodiments:
according to the preparation method of the high-strength cement, the high-strength cement raw materials comprise portland cement, sand, an improvement additive, a filling agent and a water reducing agent, the improvement additive comprises glass fibers, polyethylene fibers, polyvinyl alcohol fibers and carbon nano tubes, the glass fibers, the polyethylene fibers and the polyvinyl alcohol fibers with different elastic moduli are mixed and added into crack expansion areas uniformly distributed in the cement to slow crack expansion and increase breaking strength, the toughness of the cement is changed through the carbon nano tubes, the filling agent comprises kaolin, diatomite, bentonite, titanium slag and gypsum powder, the kaolin, the diatomite, the bentonite, the titanium slag and the gypsum powder are uniformly filled into the cement to increase the wear resistance and strength of the cement, and the weight part ratio of the portland cement, the sand, the improvement additive, the filling agent and the water reducing agent is 100 parts of the portland cement, 250 parts of sand, 3-5 parts of an improved additive, 7-10 parts of a filling agent and 1 part of a water reducing agent, and the specific preparation method comprises the following steps:
the first embodiment is as follows:
step (1): weighing 100 parts of portland cement, 250 parts of sand, 5 parts of an improvement additive, 7 parts of a filler and 1 part of a water reducing agent according to the weight part ratio;
step (2): placing kaolin, bentonite, gypsum powder, diatomite and titanium slag in a pulverizer, pulverizing and mixing at the rotation speed of 130r/min until the particle size and the diameter of the pulverized particles are 0.6mm to obtain a mixture A;
and (3): placing the mixture A, glass fiber, polyethylene fiber, polyvinyl alcohol fiber and carbon nano tube in a mixer for fully mixing, wherein the mixing speed is 150r/min, and the mixing time is 20min to obtain a mixture B;
and (4): placing the Portland cement, the sand, the water reducing agent and the mixture B in a spiral stirrer for mixing, wherein the stirring time is 45 minutes, pouring the mixture into a mold for constant-temperature maintenance after stirring, the maintenance time is 20 days, the maintenance temperature in the first 10 days is 45 ℃, and the maintenance temperature in the last 10 days is 32 ℃, so that the high-strength cement can be obtained.
Example two:
step (1): weighing 100 parts of portland cement, 250 parts of sand, 3 parts of an improvement additive, 10 parts of a filler and 1 part of a water reducing agent according to the weight part ratio;
step (2): placing kaolin, bentonite, gypsum powder, diatomite and titanium slag in a pulverizer, pulverizing and mixing at the rotation speed of 130r/min until the particle size and the diameter of the pulverized particles are 0.6mm to obtain a mixture A;
and (3): placing the mixture A, glass fiber, polyethylene fiber, polyvinyl alcohol fiber and carbon nano tube in a mixer for fully mixing, wherein the mixing speed is 150r/min, and the mixing time is 20min to obtain a mixture B;
and (4): placing the portland cement, the sand, the water reducing agent and the mixture B inside a spiral stirrer for mixing, wherein the stirring time is 45 minutes, pouring the mixture into a mold for constant-temperature maintenance after stirring, the maintenance time is 20 days, the maintenance temperature in the first 10 days is 45 ℃, and the maintenance temperature in the last 10 days is 32 ℃, so that the high-strength cement with the strength different from that of the embodiment I can be obtained, can be selected according to the use condition, and is suitable for construction in different places.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The preparation method of the high-strength cement is characterized in that raw materials of the high-strength cement comprise portland cement, sand, an improvement additive, a filler and a water reducing agent, the improvement additive comprises glass fiber, polyethylene fiber, polyvinyl alcohol fiber and carbon nano tubes, the filler comprises kaolin, diatomite, bentonite, titanium slag and gypsum powder, the weight parts of the portland cement, the sand, the improvement additive, the filler and the water reducing agent are 100 parts of the portland cement, 250 parts of the sand, 3-5 parts of the improvement additive, 7-10 parts of the filler and 1 part of the water reducing agent, and the preparation method comprises the following steps:
step (1): weighing portland cement, sand, an improvement additive, a filling agent and a water reducing agent according to the weight part ratio;
step (2): placing kaolin, bentonite, gypsum powder, diatomite and titanium slag in a pulverizer to pulverize and mix at the rotation speed of 120 plus 150r/min until the particle size diameter of the pulverized particles is 0.5-1mm, so as to obtain a mixture A;
and (3): the mixture A, glass fiber, polyethylene fiber, polyvinyl alcohol fiber and carbon nano tube are placed in a mixer to be fully mixed, the mixing speed is 120-;
and (4): placing the Portland cement, the sand, the water reducing agent and the mixture B in a spiral stirrer for mixing, wherein the stirring time is 45 minutes, pouring the mixture into a mold for constant-temperature maintenance after stirring, the maintenance time is 20 days, the maintenance temperature in the first 10 days is 45 ℃, and the maintenance temperature in the last 10 days is 32 ℃, so that the high-strength cement can be obtained.
2. The method for preparing high-strength cement according to claim 1, wherein the weight part ratio of the glass fiber, the polyethylene fiber, the polyvinyl alcohol fiber and the carbon nanotube is 2:2:2: 1.
3. The method for preparing high-strength cement according to claim 1, wherein the weight part ratio of the kaolin, the diatomite, the bentonite, the titanium slag and the gypsum powder is 3:1:3:2: 1.
4. The method of claim 1, wherein the water reducer is a naphthalene water reducer.
5. The method for preparing a high strength cement according to claim 1, wherein the particle size diameter obtained in the step (2) is 0.6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110111695.0A CN112876164A (en) | 2021-01-27 | 2021-01-27 | Preparation method of high-strength cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110111695.0A CN112876164A (en) | 2021-01-27 | 2021-01-27 | Preparation method of high-strength cement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112876164A true CN112876164A (en) | 2021-06-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110111695.0A Withdrawn CN112876164A (en) | 2021-01-27 | 2021-01-27 | Preparation method of high-strength cement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112876164A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114133204A (en) * | 2021-12-23 | 2022-03-04 | 浙江研翔新材料有限公司 | Cement-based self-healing permeable crystallization material and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104030634A (en) * | 2014-06-12 | 2014-09-10 | 杭州固华复合材料科技有限公司 | High-strength and high-toughness reactive powder concrete of carbon doped nano-tube and preparation method of high-strength and high-toughness reactive powder concrete |
| CN104628341A (en) * | 2014-02-09 | 2015-05-20 | 黄小仙 | Method for preparing high-strength silicate cement product |
| CN106242434A (en) * | 2016-08-29 | 2016-12-21 | 蚌埠市宝运商品混凝土有限公司 | A kind of highway is with high durability degree concrete |
| CN106467382A (en) * | 2015-08-21 | 2017-03-01 | 李爱玲 | A kind of high-intensity anti-cracking ecological, environmental protective cement |
| KR101941179B1 (en) * | 2018-05-14 | 2019-01-22 | 주식회사 유버스 | Composition for repairing and reinforcing concrete structure comprising high strength mortar, and method of repairing and reinforcing concrete structures using the same |
| CN110627442A (en) * | 2019-10-14 | 2019-12-31 | 北京工业大学 | Fiber grid reinforced hybrid fiber high strength and high ductility cement-based composite inspection well cover and its preparation |
-
2021
- 2021-01-27 CN CN202110111695.0A patent/CN112876164A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104628341A (en) * | 2014-02-09 | 2015-05-20 | 黄小仙 | Method for preparing high-strength silicate cement product |
| CN104030634A (en) * | 2014-06-12 | 2014-09-10 | 杭州固华复合材料科技有限公司 | High-strength and high-toughness reactive powder concrete of carbon doped nano-tube and preparation method of high-strength and high-toughness reactive powder concrete |
| CN106467382A (en) * | 2015-08-21 | 2017-03-01 | 李爱玲 | A kind of high-intensity anti-cracking ecological, environmental protective cement |
| CN106242434A (en) * | 2016-08-29 | 2016-12-21 | 蚌埠市宝运商品混凝土有限公司 | A kind of highway is with high durability degree concrete |
| KR101941179B1 (en) * | 2018-05-14 | 2019-01-22 | 주식회사 유버스 | Composition for repairing and reinforcing concrete structure comprising high strength mortar, and method of repairing and reinforcing concrete structures using the same |
| CN110627442A (en) * | 2019-10-14 | 2019-12-31 | 北京工业大学 | Fiber grid reinforced hybrid fiber high strength and high ductility cement-based composite inspection well cover and its preparation |
Non-Patent Citations (1)
| Title |
|---|
| 谢迁等: "用于水泥砂浆矿物掺合料的发展现状及展望", 《混凝土》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114133204A (en) * | 2021-12-23 | 2022-03-04 | 浙江研翔新材料有限公司 | Cement-based self-healing permeable crystallization material and preparation method thereof |
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| PB01 | Publication | ||
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Application publication date: 20210601 |