CN100358824C - High active concrete admixture - Google Patents
High active concrete admixture Download PDFInfo
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- CN100358824C CN100358824C CNB2006100181110A CN200610018111A CN100358824C CN 100358824 C CN100358824 C CN 100358824C CN B2006100181110 A CNB2006100181110 A CN B2006100181110A CN 200610018111 A CN200610018111 A CN 200610018111A CN 100358824 C CN100358824 C CN 100358824C
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- calcium
- activity
- calcium fly
- concrete admixture
- raw material
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- 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
Abstract
The present invention relates to a high-activity concrete admixture which is characterized in that the high-activity concrete admixture is mainly formed by mixing and grinding a high-calcium fly-ash modified material and a high-calcium fly ash (raw material) into powder; the high-activity concrete admixture is prepared from the raw materials of the proportion by weight: 1 to 1.5 portions of high-calcium fly-ash modified material and 10 portions of high-calcium fly ash; the high-calcium fly-ash modified material is mainly formed by mixing 1 to 3 portions of Fe2SO4, 2 to 4 portions of Na2SO4, 3 to 5 portions of calcined gypsum and 2 to 3 portions of carbide slag (raw material). The present invention has the characteristics of high stability, high hydration activity and high performance stability. When used, the high-activity concrete admixture can increase the doping amount of high-calcium fly ash in cement concrete, reduce the cost and enhance the durability of cement products; the present invention has obvious economic benefit and social benefit.
Description
Technical field
The present invention relates to a kind of high-activity concrete additive.
Background technology
1.3 hundred million tons of China's flyash annual emissions, wherein high-calcium fly ass accounts for 8%.High-calcium fly ass adopts brown coal and sub-bituminous coal burning directly to produce by power plant on the one hand, obtains calcium-enforced slag by increasing the calcium burning on the other hand.China successfully adopts cyclone furnace to increase the country that the calcium burning process utilizes low grade coal the earliest and all the time, owing to increase the flameholding that the calcium burning process not only can make low grade coal, and has an environmental-protection function of solid sulphur, therefore domestic changing into increases calcium incendiary power plant in increase gradually, add that the Inner Mongol god east of bowing wins the large scale mining in brown coal field, the quantity of high-calcium fly ass is in cumulative year after year.Because skewness, high-calcium fly ass surpass the output of low calcium ash in some areas.Low calcium fly ash is used widely as the blended material or the concrete admixture of cement, but high-calcium fly ass is because free calcium oxide content is higher, may bring stability problem, so be subjected to serious obstruction in cement concrete, the especially application in cement mixture.
The compositing characteristic of high-calcium fly ass is to comprise that the total CaO content of active CaO and free CaO is than higher.Active CaO is the key ingredient of decision hydration activity in the cement concrete mineral material commonly used, and the high CaO content characteristics of high-calcium fly ass makes it have the latent activity of the aquation stronger than low calcium ash, the CaO content of some calcium-enforced slag even surpass the higher slag powders of hydration activity illustrates that it may meet or exceed the activity level of slag powders.
Solving stability problem is the gordian technique that improves high-calcium fly ass volume in cement concrete, general adopt ageing, water spray, chemi-excitation, mechanical grinding, mix other mineral and mix methods such as material, yet the production efficiency of art methods is lower, grow, weaken the activity advantage of high-calcium fly ass with respect to low calcium ash, production cost height and product performance poor stability such as ageing and water spray means cycle; Simple chemi-excitation and mechanical grinding are handled limited to the improvement effect of stability; Other adulterants of blending have then limited range of application, or the like.Simultaneously, because the hydration activity of high-calcium fly ass self is starkly lower than other mineral materials such as slag powders, steel-making slag powder, so the volume of high-calcium fly ass in cement concrete is difficult to improve.
Summary of the invention
For overcoming the deficiencies in the prior art, the object of the present invention is to provide a kind of in cement concrete the volume height, have high-activity concrete additive than high-stability and hydration activity.
The technical solution adopted for the present invention to solve the technical problems is as follows:
A kind of concrete admixture is characterized in that it is formed by high calcium flyash modified material and high-calcium fly ass raw material combined grinding, and the shared parts by weight of each raw material are: 10 parts of high calcium flyash modified material 1-1.5 part, high-calcium fly asses; Wherein, high calcium flyash modified material, it is by Fe
2SO
4, Na
2SO
4, calcined gypsum and carbide slag raw material mix, the shared parts by weight of each raw material of high calcium flyash modified material are: Fe
2SO
41-3 part, Na
2SO
42-4 part, calcined gypsum 3-5 part, carbide slag 2-3 part.
Described high-calcium fly ass is the Blain specific surface 300-600m that adopts the power plant of cyclone type boiler combustion brown coal, sub-bituminous coal or power plant that employing increases the calcium burning process to gather dust and obtain through electricity
2/ kg, CaO weight content are 10%-45%, wherein the free CaO weight content is the coal ash of 3%-10%.
Described calcined gypsum is that calcining forms through 750 ℃-850 ℃ temperature for the mixed gypsum of the plaster of paris, chemical gypsum or the plaster of paris and chemical gypsum.
Described carbide slag is an industrial residue of producing polyvinyl chloride, polyvinyl alcohol or acetylene, and through oven dry, its water content is lower than 5% to industrial residue in advance.
Above-mentioned high-activity concrete additive the preparation method, comprise the steps: 1), the preparation of high calcium flyash modified material: by the shared parts by weight of each raw material be: Fe
2SO
41-3 part, Na
2SO
42-4 part, calcined gypsum 3-5 part, carbide slag 2-3 part is chosen Fe
2SO
4, Na
2SO
4, calcined gypsum with and carbide slag mix, high calcium flyash modified material; 2), be by the shared parts by weight of each raw material: 10 parts of high calcium flyash modified material 1-1.5 part, high-calcium fly asses, choose high calcium flyash modified material and high-calcium fly ass raw material combined grinding, product.
High-activity concrete additive provided by the invention compared with prior art has following major advantage:
1. improve the stability and the hydration activity of high-calcium fly ass simultaneously, and efficient is higher, can in cement concrete, adopts under the condition of 50% high-calcium fly ass equivalent replacement cement and eliminate stability hidden danger; Effectively improve high-calcium fly ass early, in, the intensity in the different length of times such as back, making the activity index of high-calcium fly ass reach Blain specific surface is 400m
2The level of the slag powders of/kg, activity index obtains according to the strength ratio test.
2. high calcium flyash modified material is formed according to the design of high-calcium fly ass self hydration characteristics, can adjust simultaneously owing to add the caused cement setting time variation of high-calcium fly ass.
3. preparation technology is simple, and is with low cost, is suitable for large-scale industrial production.
The reason that free calcium oxide (f-CaO) produces stability problem in the high-calcium fly ass is, f-CaO adds in cement behind the water can not immediate response, but after setting up and have certain intensity, cement concrete constructions just generates calcium hydroxide with the water reaction, the reaction product volume increases considerably, thereby produces expanded destruction.High calcium flyash modified material provided by the invention can be converted into active calcium oxide with the part free calcium oxide in the high-calcium fly ass, make the objectionable constituent of original time-delay reaction be converted into the beneficiating ingredient that promotes the early hydration reaction, helps the structural strength development, promptly turn harm into good, and then increase substantially the hydration activity of high-calcium fly ass, under the prerequisite that guarantees stability and intensity, improve the volume of high-calcium fly ass in cement concrete.
High-activity concrete additive provided by the invention, various activity excitation measures of being adopted and stability improve measure and had both had not same-action, mutually promote again:
Fe
2SO
4, Na
2SO
4All provide sulphate activation with calcined gypsum to cement-high-calcium fly ass material system.Fe
2SO
4Morning, intermediary and later stages hydration activity to system all have remarkable enhancement, but it uses separately the workability that causes system to worsen, make newly mix the initial of cement concrete and through the time degree of mobilization obviously reduce; Na
2SO
4The system workability is had no adverse effect, to early, mid-term active promoter action remarkable, but make the later strength retraction; With Fe
2SO
4With Na
2SO
4After compound by a certain percentage, the remarkable enhancement that guarantees under the system workability prerequisite morning, intermediary and later stages hydration activity can not influenced.The general employing regulated early stage extent of hydration through the various gypsum of incinerating in the manufacture of cement, thereby makes cement setting time satisfy general construction requirement, and simultaneously, gypsum also plays enhancement in cement; Compare with incinerating gypsum not, the solubleness height of calcined gypsum, crystalline structure is lax, the specific activity of himself is higher, so to the active sulphate activation efficient of other mineral height, but reduced the due delayed coagulation of gypsum, with calcined gypsum not compound after, not only can improve activity but also can keep delayed coagulation; Method provided by the invention is to adopt calcined gypsum when high-calcium fly ass is carried out modification, after the high-calcium fly ass through modification adds cement, forms the acting in conjunction of calcined gypsum and non-calcined gypsum.
The main component of carbide slag is Ca (OH)
2, can provide the alkali excitation for system, carbide slag can promote early hydration speed simultaneously, improves the detrimental action that high-calcium fly ass is excessively postponed time of coagulation; But carbide slag can significantly improve the need water ratio of cement-high-calcium fly ass material system, so control its volume, the caused water that needs can be offset the reduction amount of high-calcium fly ass to need water ratio than increasing amount under suitable volume, thereby makes the whole water that needs than not producing considerable change.
High-activity concrete additive using method provided by the invention is in the concrete batching process, to adopt the high-activity concrete additive equivalent substitution cement of 10%-30% according to weight ratio.
In the prior art, patent: 200310109275 adopt flyash 30-50%, blast furnace slag 40-60%, natural mineral 5-15% and enhancing activator 3-10% to prepare concrete composite blending material.The present invention and patent: 200310109275 important difference is: it is main raw material(s) that the present invention adopts high calcium ash, its gordian technique is the stability problem that solves high calcium ash, and make full use of and contain higher active CaO in the high calcium ash, thereby produce higher hydration activity, simultaneously, the enhancing activator component difference that is adopted.The present invention has the high characteristics of stability, hydration activity and stability, adopts the present invention can increase the volume of high-calcium fly ass in cement concrete, reduces cost and improves the cement products weather resistance, has remarkable economic and social benefit.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment:
High-activity concrete additive the preparation method, 1, be mixed with high calcium flyash modified material by the raw material ratio of table 1:
The prescription of table 1 high calcium flyash modified material (weight ratio, unit: part)
High-calcium fly ass is the Blain specific surface 300-600m that adopts the power plant of cyclone type boiler combustion brown coal, sub-bituminous coal or power plant that employing increases the calcium burning process to gather dust and obtain through electricity
2/ kg, CaO weight content are 10%-45%, wherein the free CaO weight content is the coal ash of 3%-10%.
Calcined gypsum is that calcining forms through 750 ℃-850 ℃ temperature for the mixed gypsum of the plaster of paris, chemical gypsum or the plaster of paris and chemical gypsum.During the mixing of the plaster of paris and chemical gypsum, the two is any proportioning.
Carbide slag is an industrial residue of producing polyvinyl chloride, polyvinyl alcohol or acetylene, and through oven dry, its water content is lower than 5% to industrial residue in advance.
2, the raw material ratio according to table 2 prepares high-activity concrete additive respectively:
Table 2 prescription of the present invention (weight ratio, unit: part)
Adopt the high-activity concrete additive (being designated as AF) of scheme 2 preparations in the table 2, and adopt 30% AF equivalent substitution cement of cement according to weight ratio, (GB12957-2005) prepare 40 * 40 * 160mm mortar specimen according to " as the industrial residue activity test method of cement additive ", cooperate when intensity results such as table 3.For the activity of comparative illustration high calcium ash is improved effect, adopt low calcium ash to carry out modification with scheme in the table 24, the low calcium ash of the modification that obtains concrete admixture is designated as LF, and same equivalent substitution cement 30% preparation 40 * 40 * 160mm mortar specimen, and experimental result is listed table 3 in.
High-calcium fly ass and cement mortar mix ratio and intensity that table 3 different modes is handled
| Numbering | AF | LF | Cement | Sand | Water | Degree of mobilization | Ultimate compression strength/MPa | Activity index | ||
| Gram | Gram | Gram | Gram | Gram | Millimeter | 7 days | 28 days | 7 days | 28 days | |
| 1 | 0 | 0 | 540 | 1350 | 238 | 134 | 41.7 | 68.2 | 1 | 1 |
| 2 | 162 | 0 | 378 | 1350 | 226 | 132 | 32.5 | 64.1 | 0.78 | 0.96 |
| 3 | 0 | 162 | 378 | 1350 | 228 | 135 | 27.3 | 56.8 | 0.65 | 0.83 |
As seen from Table 3, because the thick water consumption of mark of high-activity concrete additive is lower than plain cement, so after in cement mortar, adopting 30% high-activity concrete additive equivalent substitution cement, water consumption is reduced to 226 grams from 238 grams under the prerequisite that keeps identical degree of mobilization (125-135mm), and promptly water-cement ratio is reduced to 0.42 from 0.44.Adopt of the present invention excite measure after, 7 days activity indexs reach 0.78,28 day activity index and reach 0.96.
The low calcium ash of modification concrete admixture is close to the improvement effect and the high-activity concrete additive of flowability, consumptive use of water normal consistence also is reduced to 228 grams by 238 grams, but hydration activity is than the remarkable reduction of high-activity concrete additive, even adopt identical activity excitation measure with high-activity concrete additive, its 7 days, 28 days activity index is respectively 0.65 and 0.83, is starkly lower than the hydration activity of high-activity concrete additive.
Claims (4)
1. a concrete admixture is characterized in that it is formed by high calcium flyash modified material and high-calcium fly ass raw material combined grinding, and the shared parts by weight of each raw material are: 10 parts of high calcium flyash modified material 1-1.5 part, high-calcium fly asses; Wherein, high calcium flyash modified material, it is by Fe
2SO
4, Na
2SO
4, calcined gypsum and carbide slag raw material mix, the shared parts by weight of each raw material of high calcium flyash modified material are: Fe
2SO
41-3 part, Na
2SO
42-4 part, calcined gypsum 3-5 part, carbide slag 2-3 part.
2. a kind of concrete admixture according to claim 1 is characterized in that: described high-calcium fly ass is the Blain specific surface 300-600m that adopts the power plant of cyclone type boiler combustion brown coal, sub-bituminous coal or power plant that employing increases the calcium burning process to gather dust and obtain through electricity
2/ kg, CaO weight content are 10%-45%, wherein the free CaO weight content is the coal ash of 3%-10%.
3. a kind of concrete admixture according to claim 1 is characterized in that: described calcined gypsum is formed by the temperature calcining of gypsum through 750 ℃-850 ℃.
4. a kind of concrete admixture according to claim 1 is characterized in that: described carbide slag is an industrial residue of producing polyvinyl chloride, polyvinyl alcohol or acetylene, and through oven dry, its water content is lower than 5% to industrial residue in advance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100181110A CN100358824C (en) | 2006-01-05 | 2006-01-05 | High active concrete admixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100181110A CN100358824C (en) | 2006-01-05 | 2006-01-05 | High active concrete admixture |
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| Publication Number | Publication Date |
|---|---|
| CN1792955A CN1792955A (en) | 2006-06-28 |
| CN100358824C true CN100358824C (en) | 2008-01-02 |
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|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102167532B (en) * | 2010-12-15 | 2013-02-13 | 中国矿业大学(北京) | concrete admixture and a method for preparing the concrete admixture by calcining coal gangue |
| CN103896543B (en) * | 2014-03-10 | 2016-05-18 | 临沧师范高等专科学校 | Baking-free ceramicite taking brown coal germanium tailings as primary raw material and preparation method thereof |
| CN114230223B (en) * | 2021-12-17 | 2022-08-26 | 东北大学 | Multi-solid-waste admixture, preparation method thereof and cement mortar |
| CN116444288A (en) * | 2023-05-15 | 2023-07-18 | 昆明幸福阳光新能源有限公司 | Formula for producing aerated concrete block by aiming at inferior lignite clean combustion solid waste |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1071720C (en) * | 1997-01-09 | 2001-09-26 | 徐彬 | Versatile slag flyash cement excitant and its use |
| JP2002128559A (en) * | 2000-10-16 | 2002-05-09 | Denki Kagaku Kogyo Kk | Cement composite and acid resistant cement concrete using it |
| CN1546412A (en) * | 2003-12-11 | 2004-11-17 | 上海大学 | Composite mineral addition for concretes |
-
2006
- 2006-01-05 CN CNB2006100181110A patent/CN100358824C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1071720C (en) * | 1997-01-09 | 2001-09-26 | 徐彬 | Versatile slag flyash cement excitant and its use |
| JP2002128559A (en) * | 2000-10-16 | 2002-05-09 | Denki Kagaku Kogyo Kk | Cement composite and acid resistant cement concrete using it |
| CN1546412A (en) * | 2003-12-11 | 2004-11-17 | 上海大学 | Composite mineral addition for concretes |
Non-Patent Citations (1)
| Title |
|---|
| 高钙粉煤灰复合钢渣改性技术的研究. 马保国等.水泥工程，第4期. 2005 * |
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| CN1792955A (en) | 2006-06-28 |
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