CN108558242B - Cement for underwater engineering - Google Patents
Cement for underwater engineering Download PDFInfo
- Publication number
- CN108558242B CN108558242B CN201810167321.9A CN201810167321A CN108558242B CN 108558242 B CN108558242 B CN 108558242B CN 201810167321 A CN201810167321 A CN 201810167321A CN 108558242 B CN108558242 B CN 108558242B
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- CN
- China
- Prior art keywords
- cement
- parts
- cellulose acetate
- underwater engineering
- underwater
- 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.)
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Classifications
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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
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
- C08B3/14—Preparation of cellulose esters of organic acids in which the organic acid residue contains substituents, e.g. NH2, Cl
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B3/00—Preparation of cellulose esters of organic acids
- C08B3/22—Post-esterification treatments, including purification
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/74—Underwater applications
Abstract
The invention relates to the technical field of building materials, and particularly discloses cement for underwater engineering. The composition comprises the following components in parts by weight: 100-150 parts of cement; 1-3 parts of polyacrylamide; 0.1-1 part of modified cellulose acetate. The cement for the underwater engineering has excellent anti-dispersion performance, and can reduce the loss of the cement when being used for underwater construction so as to ensure the strength of cement concrete after construction.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to cement for underwater engineering.
Background
The cement is a powdery hydraulic inorganic cementing material, is added with water and stirred to form slurry, can be hardened in air or in water better, and can firmly bond materials such as sand, stone and the like together. The method is widely applied to engineering such as civil construction, water conservancy, national defense and the like.
The cement for underwater engineering is a cement with special application, and the cement with strong anti-dispersion capability is required to be used for reducing the loss of the cement when underwater construction is carried out, so that the strength of cement concrete is ensured. The anti-dispersion capability of the existing cement for underwater engineering needs to be further improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing cement for underwater engineering.
The technical problem to be solved by the invention is realized by the following technical scheme:
the cement for the underwater engineering comprises the following components in parts by weight:
100-150 parts of cement; 1-3 parts of polyacrylamide; 0.1-1 part of modified cellulose acetate.
Preferably, the cement for underwater engineering comprises the following components in parts by weight:
120-150 parts of cement; 2-3 parts of polyacrylamide; 0.2-0.5 part of modified cellulose acetate.
Further preferably, the cement for underwater engineering comprises the following components in parts by weight:
120 parts of cement; 2 parts of polyacrylamide; 0.5 part of modified cellulose acetate.
Preferably, the modified cellulose acetate is prepared by a method comprising the following steps:
sequentially adding cellulose acetate, cardanol, 3-phenylpropionyl chloride and triethylamine into dioxane, then carrying out heating reflux reaction, and dropwise adding methanol into a reaction solution after the reaction is finished until no precipitate is generated; and drying the precipitate to obtain the modified cellulose acetate.
More preferably, the dosage ratio of the dioxane, the cellulose acetate, the cardanol, the 3-phenylpropionyl chloride and the triethylamine is as follows: 300-400 mL, 12-16 g, 8-12 g, 2-3 g, 6-8 mL.
Most preferably, the dioxane, the cellulose acetate, the cardanol, the 3-phenylpropionyl chloride and the triethylamine are used in the following ratio: 350mL, 14g, 10g, 3g, 7 mL.
Further preferably, the reflux reaction time is 6-10 h.
Most preferably, the reflux reaction time is 8 h.
Preferably, the cement is portland cement.
The invention also provides concrete for underwater engineering, which is prepared by mixing the cement for underwater engineering as a cementing material with aggregate and water and then stirring.
Has the advantages that: the cement for the underwater engineering has excellent dispersion resistance, and can reduce the loss of the cement when being used for underwater construction so as to ensure the strength of cement concrete after construction.
Detailed Description
The present invention is further explained below with reference to specific examples, which are not intended to limit the present invention in any way.
Example 1
The cement for the underwater engineering comprises the following components in parts by weight:
120 parts of cement (Portland cement with the grade of 42.5); 2 parts of polyacrylamide; 0.5 part of modified cellulose acetate.
The modified cellulose acetate is prepared by a method comprising the following steps:
sequentially adding cellulose acetate, cardanol, 3-phenylpropionyl chloride and triethylamine into dioxane, then carrying out heating reflux reaction for 8 hours, and dropwise adding methanol into a reaction solution after the reaction is finished until no precipitate is generated; and drying the precipitate to obtain the modified cellulose acetate. The dosage ratio of the dioxane, the cellulose acetate, the cardanol, the 3-phenylpropionyl chloride and the triethylamine is as follows: 350mL, 14g, 10g, 3g, 7 mL.
Example 2
The cement for the underwater engineering comprises the following components in parts by weight:
150 parts of cement (Portland cement with grade 42.5); 2 parts of polyacrylamide; 1 part of modified cellulose acetate.
The modified cellulose acetate is prepared by a method comprising the following steps:
sequentially adding cellulose acetate, cardanol, 3-phenylpropionyl chloride and triethylamine into dioxane, then carrying out heating reflux reaction for 8 hours, and dropwise adding methanol into a reaction solution after the reaction is finished until no precipitate is generated; and drying the precipitate to obtain the modified cellulose acetate. The dosage ratio of the dioxane, the cellulose acetate, the cardanol, the 3-phenylpropionyl chloride and the triethylamine is as follows: 350mL, 14g, 10g, 3g, 7 mL.
Example 3
The cement for the underwater engineering comprises the following components in parts by weight:
100 parts of cement (Portland cement with grade 42.5); 3 parts of polyacrylamide; 0.1 part of modified cellulose acetate.
The modified cellulose acetate is prepared by a method comprising the following steps:
sequentially adding cellulose acetate, cardanol, 3-phenylpropionyl chloride and triethylamine into dioxane, then carrying out heating reflux reaction for 8 hours, and dropwise adding methanol into a reaction solution after the reaction is finished until no precipitate is generated; and drying the precipitate to obtain the modified cellulose acetate. The dosage ratio of the dioxane, the cellulose acetate, the cardanol, the 3-phenylpropionyl chloride and the triethylamine is as follows: 350mL, 14g, 10g, 3g, 7 mL.
Comparative example 1
The cement for the underwater engineering comprises the following components in parts by weight:
120 parts of cement (Portland cement with the grade of 42.5); 2 parts of polyacrylamide; 0.5 part of cellulose acetate.
Comparative example 2
The cement for the underwater engineering comprises the following components in parts by weight:
120 parts of cement (Portland cement with the grade of 42.5); 2.5 parts of polyacrylamide.
And (3) performance testing: the cement, water, sand and crushed stone prepared in examples 1 to 3 and comparative examples 1 and 2 were mixed according to a ratio of 1: 0.47: 1.59: 3.39 to obtain concrete 1-5; the concrete 1-5 was tested for diffusivity (wherein a smaller diffusivity indicates better anti-dispersion performance) and 28d compressive strength, and the results are shown in Table 1.
TABLE 1 Cement Performance test results
As can be seen from the data in Table 1, the diffusivity of the cement for underwater engineering prepared in the embodiments 1 to 3 of the invention is 250 to 270mm, which is far less than the diffusivity of the cement in the comparative examples 1 and 2. The cement for underwater engineering prepared by the invention has good anti-dispersion capability. In addition, the 28d compressive strength of the cement for underwater engineering prepared in the embodiments 1 to 3 of the invention is also superior to that of the cement prepared in the proportions 1 and 2.
The data of example 1 and comparative examples 1 and 2 also show that the addition of polyacrylamide and the modified cellulose acetate prepared by the invention to cement can greatly improve the anti-dispersion capability of cement, and the anti-dispersion capability of the cement is far greater than that of cement prepared by adding polyacrylamide alone and cement prepared by adding polyacrylamide and unmodified cellulose acetate.
Claims (9)
1. The cement for the underwater engineering is characterized by comprising the following components in parts by weight:
100-150 parts of cement; 1-3 parts of polyacrylamide; 0.1-1 part of modified cellulose acetate;
the modified cellulose acetate is prepared by a method comprising the following steps:
sequentially adding cellulose acetate, cardanol, 3-phenylpropionyl chloride and triethylamine into dioxane, then carrying out heating reflux reaction, and dropwise adding methanol into a reaction solution after the reaction is finished until no precipitate is generated; and drying the precipitate to obtain the modified cellulose acetate.
2. The cement for underwater engineering as claimed in claim 1, which comprises the following components in parts by weight:
120-150 parts of cement; 2-3 parts of polyacrylamide; 0.2-0.5 part of modified cellulose acetate.
3. The cement for underwater engineering as claimed in claim 2, characterized by comprising the following components in parts by weight:
120 parts of cement; 2 parts of polyacrylamide; 0.5 part of modified cellulose acetate.
4. The cement for underwater engineering as claimed in claim 1, wherein said dioxane, cellulose acetate, cardanol, 3-phenylpropionyl chloride and triethylamine are used in the ratio of: 300-400 mL, 12-16 g, 8-12 g, 2-3 g, 6-8 mL.
5. The cement for underwater engineering as claimed in claim 4, wherein said dioxane, cellulose acetate, cardanol, 3-phenylpropionyl chloride and triethylamine are used in the following ratio: 350mL, 14g, 10g, 3g, 7 mL.
6. The cement for the underwater engineering as claimed in claim 1, wherein the reflux reaction time is 6 to 10 hours.
7. The cement for underwater engineering as claimed in claim 1, wherein the reflux reaction time is 8 hours.
8. The cement for underwater engineering as claimed in claim 1, wherein the cement is portland cement.
9. The concrete for underwater engineering is characterized by being prepared by mixing the cement for underwater engineering as claimed in any one of claims 1 to 8 with aggregate and water and then stirring the mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810167321.9A CN108558242B (en) | 2018-02-28 | 2018-02-28 | Cement for underwater engineering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810167321.9A CN108558242B (en) | 2018-02-28 | 2018-02-28 | Cement for underwater engineering |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108558242A CN108558242A (en) | 2018-09-21 |
| CN108558242B true CN108558242B (en) | 2020-11-27 |
Family
ID=63531391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810167321.9A Active CN108558242B (en) | 2018-02-28 | 2018-02-28 | Cement for underwater engineering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108558242B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3165630D1 (en) * | 1980-04-11 | 1984-09-27 | Ici Plc | Cementitious composition and cement product produced therefrom |
| CN1326796C (en) * | 2003-05-15 | 2007-07-18 | 同济大学 | Underwater antidispersion concrete admixture for building |
| CN101077832A (en) * | 2006-05-23 | 2007-11-28 | 赵文成 | Concrete capable of not dispersing in water |
| CN106045368A (en) * | 2016-05-30 | 2016-10-26 | 江苏名和集团有限公司 | Admixture special for underwater concrete |
| CN106977160B (en) * | 2017-05-08 | 2019-05-17 | 天津市滨涛混凝土有限公司 | A kind of non-dispersible underwater concrete and preparation method thereof |
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2018
- 2018-02-28 CN CN201810167321.9A patent/CN108558242B/en active Active
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| Publication number | Publication date |
|---|---|
| CN108558242A (en) | 2018-09-21 |
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