CN107721230A - Reduce cement grinding aid of cement free calcium levels and preparation method thereof - Google Patents
Reduce cement grinding aid of cement free calcium levels and preparation method thereof Download PDFInfo
- Publication number
- CN107721230A CN107721230A CN201710941596.9A CN201710941596A CN107721230A CN 107721230 A CN107721230 A CN 107721230A CN 201710941596 A CN201710941596 A CN 201710941596A CN 107721230 A CN107721230 A CN 107721230A
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- Prior art keywords
- cement
- grinding aid
- free calcium
- calcium levels
- preparation
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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
- 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
A kind of cement grinding aid for reducing cement free calcium levels, is made up of the raw material of following percentage by weight：
Description
Technical field：
The present invention relates to a kind of cement grinding aid, and in particular to a kind of cement for reducing portland cement free calcium levels helps
Grinding agent and preparation method thereof.
Background technology：
Clinker free calcium is to be related to the important quality index of cement quality, it represent raw material calcining in calcium oxide with
Silica, aluminum oxide, iron oxide combine rear remaining degree, its height directly influence cement stability and clinker it is strong
Degree.When dispensing is improper, and raw material are excessively thick or calcining is bad, no absorbed free calcium just occurs in clinker.It is ripe in cement
In the calcination process of material, most CaO can with acidic oxide chemical combination formed tricalcium silicate, dicalcium silicate, tricalcium aluminate,
The mineral such as tetra calcium aluminoferrite.But due to the influence of the factors such as material composition, raw material fineness and calcining heat, still there is a small amount of CaO
Exist in free state.The free calcium oxide that " dead roasting " is formed (CaO of 1450 DEG C of calcinings is in high temperature dead roasting state at high temperature)
Structure is dense, and aquation is very slow, generally to react within 4~8 days just obvious after adding the water.Free calcium aquation generates hydroxide
Calcium volumetric expansion 97.9%, local swelling stress can be caused inside petrifying water mudstone, therefore, with the increasing of free calcium levels
Add, be cement products tension, compression strength reduction, and then strength retraction first, cause volume stability bad when serious, cement
Product deformation or cracking, cause paste structure to be destroyed, therefore, the free calcium levels in clinker should be controlled strictly.
The control to cement free calcium is all concentrated in the control of cement production process at present, as rate of charge, grinding are thin
Degree etc., also nobody carry out the exploration in terms of cement grinding aid, to find by the addition of cement grinding aid to reduce free calcium
Approach.
The content of the invention：
In consideration of it, be necessary to design a kind of cement grinding aid for reducing cement free calcium levels and preparation method thereof, in addition,
Also provide the preparation method of this cement grinding aid.
A kind of cement grinding aid for reducing cement free calcium levels, is made up of the raw material of following percentage by weight：
Wherein, the molecular weight of calcium lignosulfonate is 7000~10000.
For CaO sheets as basic anhydride, the activity of its hydration reaction is very high, while also to release big calorimetric, by
Make CaO outer shells very fine and close in " dead roasting " so as to be difficult to hydration reaction.CaO is activated using pimelic acid for this present invention, and
Coordinate activator ethylenediamine phosphate, improve CaO hydration activities.Because CaO is basic anhydride, very easily and acid reaction, therefore i.e.
Just for " dead roasting " state, reflecting time can shorten in the presence of pimelic acid.
CaO part early stages after being activated generate Ca (OH) by hydration reaction2, avoid later stage hydration reaction band
The SiO of the volumetric expansion come and heat aggregation, another part CaO and straw ash2Calcium silicates is generated in the presence of water.
During hydrated cementitious, key reaction includes：
3CaO〃SiO2+H2O→CaO〃SiO2〃YH2O (gel)+Ca (OH)2；
2CaO〃SiO2+H2O→CaO〃SiO2〃YH2O (gel)+Ca (OH)2；
Due to constantly discharging Ca (OH)2Cement can be made to be in weakly alkaline environment, be unfavorable for pimelic acid activation CaO, therefore
Sodium gluconate need to be added, calcium lignosulfonate suitably slows down hydration rate.Sodium gluconate can be adsorbed on C3S (tricalcium silicate)
Surface Creation adsorbed film, cement hydration process is hindered, crystal is contacted with each other and is shielded, change structure-forming process.
Aliphatic acid has good dispersiveness due to long hydrocarbon chain, and in addition to CaO is activated, pimelic acid also plays
Important grind -aiding effect.Because the aliphatic acid below 6 charcoals has volatility, and high charcoal aliphatic acid is more sticky, therefore uses heptan two
Acid.
The surface-active of calcium lignosulfonate increases with the increase of its molecular weight, although when the dosage of calcium lignosulfonate
During less than cement 0.5%, the calcium lignosulfonate of molecular weight 10000~30000 can make cement mortar have maximum mobility, but
Cement proportion is integrally accounted in view of cement grinding aid no more than 0.5%, excessive molecular weight necessarily causes too low concentration, therefore rolls over
Inner feelings use molecular weight for 7000~10000 calcium lignosulfonate.
Preferably, the cement grinding aid for reducing cement free calcium levels is made up of the raw material of following percentage by weight：
A kind of preparation method for the cement grinding aid for reducing cement free calcium levels, sodium gluconate, straw ash are added
In water, stir, solution is heated to 40~50 DEG C, add calcium lignosulfonate, stirring, stand, it is 25 to treat solution temperature
Pimelic acid, ethylenediamine phosphate are sequentially added at~30 DEG C, is uniformly mixing to obtain this cement grinding aid.
The present invention reduces cement free calcium levels, for technique bar from the angle of cement grinding aid by adding auxiliary agent
Part controls more difficult or unstable enterprise, more a kind of selections so that can eliminate free calcium not using central in cement
Good influence.
Embodiment：
Embodiment one：
A kind of cement grinding aid for reducing cement free calcium levels, is made up of the raw material of following percentage by weight：
Its preparation method is：A kind of preparation method for the cement grinding aid for reducing cement free calcium levels, by gluconic acid
Sodium, straw ash are added to the water, and stir, and solution is heated into 40~50 DEG C, add calcium lignosulfonate, stirring, stand, treat
Solution temperature sequentially adds pimelic acid, ethylenediamine phosphate when being 25~30 DEG C, is uniformly mixing to obtain this cement grinding aid.
Embodiment two：
A kind of cement grinding aid for reducing cement free calcium levels, is made up of the raw material of following percentage by weight：
Its preparation method is the same as embodiment one.
Embodiment three：
A kind of cement grinding aid for reducing cement free calcium levels, is made up of the raw material of following percentage by weight：
Its preparation method is the same as embodiment one.
The cement grinding aid of embodiment one, two, three is added with the mass ratio of cement 0.45%, the material proportion of cement is such as
Under：76% clinker, 4% gypsum, 5% lime are, 15% gangue.By finished cement sampling plus water stirring 30min, it is small to stand 3
When and water seasoning, free calcium levels are determined by glycerine-Ethanol Method afterwards, test result see the table below.
Claims (3)
1. a kind of cement grinding aid for reducing cement free calcium levels, it is characterised in that by the raw material system of following percentage by weight
Into：
Wherein, the molecular weight of calcium lignosulfonate is 7000~10000.
2. the cement grinding aid of cement free calcium levels is reduced as claimed in claim 1, it is characterised in that by following weight hundred
The raw material of ratio is divided to be made：
3. the preparation method of the cement grinding aid of cement free calcium levels is reduced as claimed in claim 1, it is characterised in that will
Sodium gluconate, straw ash are added to the water, and stir, and solution is heated into 40~50 DEG C, calcium lignosulfonate is added, stirs
Mix, stand, sequentially add pimelic acid, ethylenediamine phosphate when solution temperature is 25~30 DEG C, be uniformly mixing to obtain this cement and help
Grinding agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710941596.9A CN107721230A (en) | 2017-09-30 | 2017-09-30 | Reduce cement grinding aid of cement free calcium levels and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710941596.9A CN107721230A (en) | 2017-09-30 | 2017-09-30 | Reduce cement grinding aid of cement free calcium levels and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107721230A true CN107721230A (en) | 2018-02-23 |
Family
ID=61210770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710941596.9A Pending CN107721230A (en) | 2017-09-30 | 2017-09-30 | Reduce cement grinding aid of cement free calcium levels and preparation method thereof |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86106706A (en) * | 1986-09-27 | 1988-04-06 | 高洁 | Mixtures for improving stability of cement |
| CN101696096A (en) * | 2009-10-30 | 2010-04-21 | 南京永能新材料有限公司 | Liquid cement grinding additive |
| CN101717219A (en) * | 2009-11-20 | 2010-06-02 | 上海市建筑科学研究院(集团)有限公司 | Volume stabilizer of free calcium oxide as well as preparation and application thereof |
| CN104844051A (en) * | 2015-04-01 | 2015-08-19 | 淮安市楚城水泥有限公司 | Cement grinding aid and preparation method therefor |
| CN104926190A (en) * | 2015-05-27 | 2015-09-23 | 湖州华仑助剂科技有限公司 | Composite cement grinding aid |
| CN106045347A (en) * | 2016-06-02 | 2016-10-26 | 辽宁科技大学 | Method for melting and digesting free calcium oxide in converter slag |
-
2017
- 2017-09-30 CN CN201710941596.9A patent/CN107721230A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86106706A (en) * | 1986-09-27 | 1988-04-06 | 高洁 | Mixtures for improving stability of cement |
| CN101696096A (en) * | 2009-10-30 | 2010-04-21 | 南京永能新材料有限公司 | Liquid cement grinding additive |
| CN101717219A (en) * | 2009-11-20 | 2010-06-02 | 上海市建筑科学研究院(集团)有限公司 | Volume stabilizer of free calcium oxide as well as preparation and application thereof |
| CN104844051A (en) * | 2015-04-01 | 2015-08-19 | 淮安市楚城水泥有限公司 | Cement grinding aid and preparation method therefor |
| CN104926190A (en) * | 2015-05-27 | 2015-09-23 | 湖州华仑助剂科技有限公司 | Composite cement grinding aid |
| CN106045347A (en) * | 2016-06-02 | 2016-10-26 | 辽宁科技大学 | Method for melting and digesting free calcium oxide in converter slag |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180223 |
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| RJ01 | Rejection of invention patent application after publication |