CN110981267A - Cement grinding aid and application thereof in improving autoclaved curing strength of high-alumina clinker cement - Google Patents
Cement grinding aid and application thereof in improving autoclaved curing strength of high-alumina clinker cement Download PDFInfo
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- CN110981267A CN110981267A CN201911270759.0A CN201911270759A CN110981267A CN 110981267 A CN110981267 A CN 110981267A CN 201911270759 A CN201911270759 A CN 201911270759A CN 110981267 A CN110981267 A CN 110981267A
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- cement
- grinding aid
- autoclaved curing
- strength
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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
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/52—Grinding aids; Additives added during 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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a cement grinding aid and application thereof in improving the autoclaved curing strength of high-alumina clinker cement, wherein the grinding aid comprises the following components in percentage by mass: 30-35% of grinding-aid components, 5-10% of sodium metaaluminate, 6-10% of other inorganic salts, 10-15% of sodium gluconate, 0.1-0.5% of sodium polyacrylate and the balance of water; the grinding aid component consists of dimeric glycerol and monoethanol diisopropanolamine. The grinding aid has a high autoclaved curing and strengthening effect, and compared with the traditional grinding aid, the autoclaved curing strength is improved by more than 3 MPa. The grinding aid also has better additive adaptability, and the net slurry fluidity is improved by 20mm compared with the traditional grinding aid.
Description
Technical Field
The invention belongs to the field of cement additives, and particularly relates to a cement grinding aid and application thereof in improving autoclaved curing strength of high-alumina clinker cement.
Background
The traditional cement grinding aid accelerates the hydration of cement through physical grinding aid action and chemical action, thereby improving the strength of the cement at each age. However, the grinding aid has a limited effect of improving the autoclaved curing strength, and can only improve the autoclaved curing strength of the P.II cement to about 54MPa, while the autoclaved curing strength of the P.II cement is required to be more than 54MPa in a common pipe pile factory. In addition, for P.II cement with clinker aluminum content more than 6%, the traditional grinding aid can only improve the autoclaved curing strength by increasing the alcohol amine content, thereby increasing the production cost.
Disclosure of Invention
The invention aims to provide a cement clinker grinding aid.
The invention also aims to provide the application of the grinding aid in improving the autoclaved curing strength of the high-alumina clinker P.II cement.
The purpose of the invention is realized by the following technical scheme:
a grinding aid comprises the following components in percentage by mass:
grinding-aid components: 30 to 35 percent
Sodium metaaluminate: 5 to 10 percent
Other inorganic salts: 6 to 10 percent
Sodium gluconate: 10 to 15 percent of
Sodium polyacrylate: 0.1 to 0.5 percent
Water: the balance;
the grinding aid component consists of dimeric glycerol and monoethanol diisopropanolamine;
the other inorganic salt is more than one of sodium sulfate, sodium chloride or sodium nitrate;
the grinding aid can be used for improving the autoclaved curing strength of the high-alumina clinker cement;
the content of aluminum in the high-aluminum clinker is more than or equal to 6 percent (w/w);
the cement is P.II cement.
The grinding aid provided by the invention can accelerate and delay the hydration process of cement at a proper time, so that the hydration of the cement is accelerated during autoclaved curing, and a better hydration product form can be kept, thereby playing a role in obviously enhancing, wherein the hydration of the cement is accelerated by the matching of other inorganic salts and sodium metaaluminate, the concrete expression is that the induction period of the hydration is shortened, the hydration of the cement is delayed by the matching of sodium gluconate and sodium polyacrylate, and the concrete expression is that the violent hydration of the cement at the earliest stage is delayed.
The grinding aid has different influences on the high-alumina clinker and the conventional clinker under the autoclaved curing, and for the conventional clinker, the conventional grinding aid can improve the strength of the cement under the conventional curing or the autoclaved curing; for high alumina clinker, conventional grinding aids hydrate the high alumina clinker cement too quickly and thus have a low strength under autoclave curing.
When the aluminum content of the cement clinker is higher, the hydration speed is higher, the autoclaved curing can further accelerate the hydration of cement to form hydration products such as tobermorite and the like, so that the cement test block can reach higher strength in a shorter time, but the excessive accelerated hydration can cause defects in the appearance of the cement hydration products and lower strength. The inorganic salt in the compound form and the sodium gluconate act on the high-alumina cement together under the steam pressure maintenance, so that the hydration speed of the cement in the initial hydration stage is accelerated, and the hydration product can keep a good appearance, thereby obtaining high strength.
Compared with the prior art, the invention has the following advantages and effects:
1. the grinding aid disclosed by the invention contains lower alcohol amine content, and the cost is controlled on the premise of maintaining the effects of grinding-aid yield improvement and conventional maintenance and strength improvement on cement.
2. The grinding aid has a high autoclaved curing and strengthening effect, and compared with the traditional grinding aid, the autoclaved curing strength is improved by more than 3 MPa.
3. The grinding aid has better additive adaptability, and the net slurry fluidity is improved by 20mm compared with the traditional grinding aid.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1
A grinding aid comprises the following components in percentage by mass:
taking 10% of dimeric glycerol, 20% of monoethanol diisopropanolamine, 8% of sodium sulfate, 8% of sodium metaaluminate, 12% of sodium gluconate, 0.5% of sodium polyacrylate and 41.5% of clean water, and compounding into a special grinding aid named ZY-1 type with the mixing amount of 5/ten thousand;
the proportion of the comparison sample is as follows: 5% of triethanolamine, 35% of diethanol monoisopropanolamine, 5% of molasses, 5% of industrial salt and 50% of clean water, wherein the names of the clean water and the traditional type-1 are respectively 5/ten thousand and 6/ten thousand;
the small grinding test is carried out, the aluminum content of the clinker is 6.3 percent (w/w), KH is 0.936, and the cement proportion is as follows:
| clinker | Desulfurized gypsum | Limestone |
| 93 | 4 | 3 |
The cement test results are as follows:
compared with a blank cement group, the traditional-1 grinding aid improves the strength of conventional curing and autoclaved curing of cement under the condition of 5/ten thousand of addition amount, the reinforcing effect of the grinding aid is increased along with the increase of the addition amount to 6/ten thousand of addition amount, but the strength under autoclaved curing is 1.1MPa lower than that under the condition of 5/ten thousand of addition amount.
Under the conventional curing, the ZY-1 type grinding aid has a similar effect to the traditional type in enhancing the cement, but the strength under the autoclaved curing is improved by 6.4MPa compared with the traditional type-1.
This shows that the ZY-1 type grinding aid has more obvious effect of enhancing the high-alumina cement under the autoclaved curing.
Example 2
A grinding aid comprises the following components in percentage by mass:
taking 5% of dimeric glycerol, 25% of monoethanol diisopropanolamine, 6% of sodium chloride, 5% of sodium metaaluminate, 15% of sodium gluconate, 0.2% of sodium polyacrylate and 43.8% of clean water, and compounding into a special grinding aid named ZY-2 type with the mixing amount of 5/ten thousand;
the comparison sample comprises 15 percent of triethanolamine, 25 percent of diethanol monoisopropanolamine, 15 percent of molasses, 8 percent of industrial salt and 37 percent of clean water, namely a traditional type-2, and the mixing amount is 5/ten thousand and 6/ten thousand respectively;
the small grinding test is carried out, the aluminum content of the clinker is 6.5% (w/w), KH is 0.930, and the cement proportion is as follows:
| clinker | Desulfurized gypsum | Limestone |
| 92 | 3.5 | 4.5 |
The cement test results are as follows:
compared with a blank cement group, the traditional-2 grinding aid improves the strength of conventional curing and autoclaved curing of cement under the condition of 5/ten thousand of addition amount, the reinforcing effect of the grinding aid is improved along with the increase of the addition amount to 6/ten thousand of addition amount, but the strength under autoclaved curing is 1.9MPa lower than that under the condition of 5/ten thousand of addition amount.
Under the conventional curing, the ZY-2 type grinding aid has a similar effect to the traditional type in enhancing the cement, but the strength under the autoclaved curing is improved by 4.7MPa compared with the traditional type-1.
The results show that the ZY-2 type grinding aid has more obvious effect of enhancing the high-alumina cement under the autoclaved curing.
Example 3
A grinding aid comprises the following components in percentage by mass:
taking 10% of dimeric glycerol, 25% of monoethanol diisopropanolamine, 6% of sodium sulfate, 5% of sodium metaaluminate, 10% of sodium gluconate, 0.1% of sodium polyacrylate and 43.9% of clean water, and compounding into a special grinding aid named ZY-3 type with the mixing amount of 5/ten thousand;
the comparison sample comprises 40 percent of diethanol monoisopropanolamine, 5 percent of molasses, 5 percent of industrial salt and 50 percent of clean water, namely a traditional type-3, and the mixing amount is 5/ten thousand respectively;
the small grinding test is carried out, the clinker aluminum content is 6.4% (w/w), KH is 0.92, and the cement proportion is as follows:
| clinker | Desulfurized gypsum | Limestone |
| 91 | 4 | 5 |
The cement test results are as follows:
compared with a blank cement group, the traditional-3 grinding aid improves the strength of conventional curing and autoclaved curing of cement under the condition of 5/ten thousand of addition amount.
Under the conventional curing, the ZY-3 type grinding aid has a similar effect to the traditional type in enhancing the cement, but the strength under the autoclaved curing is improved by 3.4MPa compared with the traditional type-1.
The results show that the ZY-3 type grinding aid has more obvious effect of enhancing the high-alumina cement under the autoclaved curing.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (5)
1. A grinding aid is characterized by comprising the following components in percentage by mass:
the grinding aid component consists of dimeric glycerol and monoethanol diisopropanolamine.
2. The grinding aid of claim 1, wherein: the other inorganic salt is more than one of sodium sulfate, sodium chloride or sodium nitrate.
3. Use of a grinding aid of claim 1 or 2 to increase the autoclaved strength of a high alumina clinker cement.
4. Use according to claim 3, characterized in that: the aluminum content of the high-aluminum clinker cement is more than or equal to 6 percent (w/w).
5. Use according to claim 3, characterized in that: the cement is P.II cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911270759.0A CN110981267A (en) | 2019-12-12 | 2019-12-12 | Cement grinding aid and application thereof in improving autoclaved curing strength of high-alumina clinker cement |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911270759.0A CN110981267A (en) | 2019-12-12 | 2019-12-12 | Cement grinding aid and application thereof in improving autoclaved curing strength of high-alumina clinker cement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111423152A (en) * | 2020-05-08 | 2020-07-17 | 华润水泥技术研发（广西）有限公司 | Special grinding aid for improving later strength of cement |
| CN112919844A (en) * | 2021-02-09 | 2021-06-08 | 华润水泥技术研发（广西）有限公司 | Grinding aid for improving adaptability of high-alumina clinker cement admixture |
| CN115557724A (en) * | 2022-09-27 | 2023-01-03 | 华润水泥技术研发（广西）有限公司 | Preparation method and application of grinding aid special for white cement |
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2019
- 2019-12-12 CN CN201911270759.0A patent/CN110981267A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111423152A (en) * | 2020-05-08 | 2020-07-17 | 华润水泥技术研发（广西）有限公司 | Special grinding aid for improving later strength of cement |
| CN112919844A (en) * | 2021-02-09 | 2021-06-08 | 华润水泥技术研发（广西）有限公司 | Grinding aid for improving adaptability of high-alumina clinker cement admixture |
| CN115557724A (en) * | 2022-09-27 | 2023-01-03 | 华润水泥技术研发（广西）有限公司 | Preparation method and application of grinding aid special for white cement |
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Application publication date: 20200410 |