CN1810696A - Freeze-thaw resisting cement and its production process - Google Patents
Freeze-thaw resisting cement and its production process Download PDFInfo
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- CN1810696A CN1810696A CN 200610005690 CN200610005690A CN1810696A CN 1810696 A CN1810696 A CN 1810696A CN 200610005690 CN200610005690 CN 200610005690 CN 200610005690 A CN200610005690 A CN 200610005690A CN 1810696 A CN1810696 A CN 1810696A
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- cement
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- raw material
- thaw
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Abstract
The present invention discloses one kind of freeze-thaw resisting cement and its production process. The material consists of clinker 90-92 wt%, limestone 4.5-6 wt%, and gypsum 4.2-5.0 wt%, and the clinker has KH=0.90+/-0.02, n=1.80+/-0.10 and p=0.90+/-0.10. It has the mineral composition of: C3S<54.0 wt%, C2S>20.0 wt%, C3A<6.0 wt%, C4AF>14.0 wt%, and f-CaO less than 1.5 wt%. The freeze-thaw resisting cement has specific surface area over 350 sq m/Kg and fineness below 2.5 %, and after 250 times of freeze-thaw, it has 3-day breaking strength over 5.0 Mpa and compression strength over 25.0 Mpa, and 28-day breaking strength over 7.0 Mpa and compression strength over 50.0 Mpa. It has low C3A content, good freeze-thaw resisting performance, fast curing, high wear resistance and high permeation resistance.
Description
Technical field:
The present invention relates to a kind of cement and production method thereof, be specifically related to a kind of freeze-thaw resisting cement and production method thereof.
Background technology:
Along with the enforcement of strategy to develop western regions, " south water to north ", " expansion of engineering projects such as West-east Gas, " transferring electricity from the west to the east ", domestic electric power, hydraulic engineering construction amount heighten, and the demand of high-performance freeze-thaw resisting cement increases thereupon.Power plant's cooling tower, the used material of construction of hydraulic engineering construction always can not fine solution freeze-thaw-technology.High-strength cement is adopted in domestic power plant, hydro project, bridge construction more, but effect is undesirable, and behind the use 3-5, buildings takes place to corrode peeling phenomenon, and maintenance capacity is big, and developed country does not have special-purpose power plant's cooling tower, water conservancy project building material yet.
Summary of the invention:
The purpose of this invention is to provide good high-performance cement of a kind of freezing and thawing performance and production method thereof.
The present invention is under general cement manufacture plant condition, and ordinary student production art improvement realization is produced.Improvement technology relates to:
According to theoretical analysis and laboratory result, the freezing and thawing performance that improve cement does not influence other physical and chemical indexs again, then must change the mineral composition of grog, to reduce the hydration heat of cement, selects the proportioning of suitable manufacture of cement batching simultaneously.
According to the hydration heat of cement clinker and the order of rate of heat release: C
3A＞C
3S＞C
4AF＞C
2S will reduce hydration heat, must reduce tricalcium aluminate C in the grog
3A and tricalcium silicate C
3The content of S correspondingly improves tetracalcium aluminoferrite C
4AF and Dicalcium Phosphate (Feed Grade) C
2S content.By repeated calculation and demonstration, think that grog rate value should be controlled at following scope:
The silicon rate
The iron rate
The final production mix proportion scheme:
1, raw material rate value requires:
KH=1.020 ± 0.02, silicon rate n=1.80 ± 0.10, iron rate p=0.90 ± 0.10
Lime carbonate titration value TCaCO
3Be controlled at 77.50 ± 0.50%,
Ferric oxide titration value Tfe
2O
3Be controlled at 3.70 ± 0.20%.
The requirement of raw material, fuel is in the raw material preparation:
Calcareous raw material: CaO content is greater than 50%; Clayey raw material: alkali content is lower than 1.0%; Ferriferous raw material: Fe
2O
3Content 55.0-62.0%; Coal-fired: thermal value is greater than 23396KJ/Kg, and ash is lower than 26.5%, and fineness of pulverized coal 0.08mm square hole sieve tails over less than 10.0%.
2, grog rate value requires:
KH=0.90 ± 0.02, silicon rate n=1.80 ± 0.10, iron rate p=0.90 ± 0.10
The clinker mineral composition requirement:
C
3S＜54.0％ C
2S＞20％ C
3A＜6.0％ C
4AF＞14.0％，
Alkali content is below 0.60%, and free calcium oxide f-CaO is below 1.0%.
3, manufacture of cement proportion scheme:
By weight ratio: grog 90～92, Wingdale 4.5～6, gypsum 4.2～5.0; Guarantee SO in the gypsum
3Content greater than 40%.
Technological measure:
1, the raw material mill feed material size goes out to grind the raw material fineness less than 7.0% (the 0.08mm square hole sieve tails over) less than 30mm.
2, guarantee the raw material homo-effect, strengthen storehouse of machinery, carry out pneumatic blending.
3, strengthen the operation in balling-up post, bulk, following powder-material guarantee balling ratio greater than more than 80% under forbidding, and be normal to guarantee kiln ventilation.
4. the cement grinding mill mill feed material size goes out to grind cement specific surface area 350m less than 30mm
2/ Kg, fineness is below 2.5%.
The technical requirements that the cement that above method is produced reaches:
Presetting period: be no earlier than 45 minutes, final setting time: less than 10 hours, loss on ignition especially had less than 5.0%: specific surface area 350m
2More than/the Kg, fineness is below 2.5%, and sulfur trioxide content 2.00～2.60% is tested through 250 freeze-thaw-s, and intensity reaches: 3 days intensity: anti-folding is greater than 5.0Mpa, and resistance to compression is greater than 25.0Mpa; 28 days intensity: anti-folding is greater than 7.0Mpa, and resistance to compression is greater than 50.0Mpa; Content of magnesia is less than 3.0%.
Advantage of the present invention: the material proportion scheme of grog rate value and mineral composition scheme, cement and the technological measure of taking, the feasible cement C that produces
3A content is low, and freezing and thawing performance is good; The early strength height, later strength enhancement rate is big; Fast solidifying, wear resistance is good, and is impervious good and have certain resisting erosion of sulfate ability; Workability, protect plasticity is good, the concrete self-leveling and the good uniformity of configuration, mainly being applicable under the northern area low temperature environment and in the underground works needs intensity height, freezing and thawing performance to be higher than the engineering of other cement requirements; More be applicable to northern ground Highrise buildings and huge concrete structure, heavy constructions such as power plant's cooling tower.
Embodiment:
Burning production in conjunction with the examination of our company elaborates to the present invention:
Present embodiment carries out under general cement manufacture plant condition, and except that following described technological measure, NM technology is undertaken by the Portland cement production technique, and this example repeats no more.
Selecting for use of starting material, fuel:
Calcareous raw material: steady quality, the quality height, impure few, CaO content is greater than 50%.
Clayey raw material: high anti-freezing melt water mud is to C
3The content requirement of A is tighter, requires clayey raw material alkali content (K
2O+Na
2O) be lower than 1.0%.
Ferriferous raw material requires high iron material, Fe
2O
3Content is between 55.0%-62.0%.Produce high anti-freezing and melt the building cement special, most importantly control AL in the grog
2O
3Content, according to grog rate value formula and production test repeatedly, raw material adopt the high ferro batching, under the prerequisite of stablizing the KH value, can suppress AL in the grog
2O
3Increasing of content increases C
2S and C
4The content of AF, restriction C
3The content of A.Our company raw material be equipped with test by low iron batching progressively to the high ferro transition of preparing burden, under the prerequisite of stablizing the KH value, the Fe in the raw material
2O
3By former 2.5%, adjust to 3.7% through 2.8%, 3.2%, along with the raising of iron level, SiO in the raw material
2, AL
2O
3Content reduce AL particularly
2O
3The minimizing of content more obvious, C when helping calcination of chamotte
3The reduction of A content.
Coal-fired: the coal-fired heat that mainly provides clinker burning, can also play the effect of regulating chemical ingredients in the grog simultaneously, coal quantity melts building cement special outbalance to producing high anti-freezing.The requirement ature of coal is good, thermal value more than 23396KJ/Kg, the coal ash dirt rate low (ash is below 26.5%) that falls, fineness of pulverized coal is less than 10.0%, (the 0.08mm square hole sieve tails over).Explanation is produced in trial-production, and every to go into kiln coal ash part higher, and the order of classes or grades at school that fineness is thicker all exists tangible calcining difficulty.Particularly coal dust is thicker, causes black duration and degree of heating long, and coal dust firing is incomplete, and coarse particles falls into kiln, and circle before forming reduces secondary air flow, and the kiln ventilation ability reduces, the rate increase that falls of ash dirt, C
3A content reduces not obvious.
Raw material, fuel are carried out the raw material preparation, make it to meet following requirement:
KH=1.020 ± 0.02, silicon rate n=1.80 ± 0.10, iron rate p=0.90 ± 0.10
Lime carbonate titration value TCaCO
3Be controlled at 77.50 ± 0.50%,
Ferric oxide titration value Tfe
2O
3Be controlled at 3.70 ± 0.20%.
The raw material that prepare are thrown the stove calcination.
Owing to adopted the high ferro batching, strengthen seeing the fire operation, be diligent in observing situation in the kiln, accomplish the timely adjustment of wind, coal, material, stablize thermal regulation in the kiln, guarantee the normal of clinker burning.
During examination was burnt and produced, the kiln internal reaction was quite obvious, and liquid phase occurs early, and viscosity is little.The high ferro batching has promoted CaO+C
2C has been quickened in the dissolving of S and diffusion
3The formation of S.The calcining temperature height, shinny in the kiln, material rolls normally, granularity is all neat, the band material is highly moderate, flame is long and concentrate, clear in the kiln, visibility is far away, the kliner coating protection well, " shadow " position is moderate, sintering range obviously broadens, the output raising.
Calcining gained grog is analyzed, and grog meets:
KH=0.90 ± 0.02, silicon rate n=1.80 ± 0.10, iron rate p=0.90 ± 0.10
The clinker mineral composition requirement:
C
3S＜54.0％ C
2S＞20％ C
3A＜6.0％ C
4AF＞14.0％，
Alkali content is below 0.60%, and free calcium oxide f-CaO is below 1.0%.
The high ferro grog that burns out, compact structure, liter focus on about 1470g/L, and color is greyish-green, the well-crystallized, epigranular, grindability is good.
The manufacture of cement batching:
By weight ratio: grog 90～92, Wingdale 4.5～6, gypsum 4.2～5.0; Guarantee SO in the gypsum
3Content greater than 40%.
Proportioning commonly used during our company produces: by weight: grog 90, Wingdale 5, gypsum 5.
Grinding of cement:
Grinding is the determinative of decision cement physical and chemical index.For the every index that makes cement reaches the requirement that plan is formulated, need rationally to adjust cement grinding, adjust the grating of secondary grinding element and the circulating load of powder separating machine, in order to reduce the fineness of cement, improve the specific surface area of cement, to guarantee the workability and the hydration heat of cement.
During my company produces grinding is adjusted, guaranteed that the cement grinding mill mill feed material size less than 30mm, goes out to grind cement specific surface area 350m
2/ Kg, fineness is below 2.5%.
Through summing up, the measure that should take in the production is:
1, in order to be beneficial to the calcining of grog, want the fineness of strict control raw material, mill feed material size must be less than 30mm, go out to grind the raw material fineness less than 7.0%, tailing over particularly to the 0.08mm square hole, be strict controlled in below 7.0%, the free calcium oxide f-CaO content when so just helping calcining in the grog is controlled at below 1.5%.
2, guarantee out mill raw material lime carbonate titration value TCaCO
3Value and ferric oxide titration value TFe
2O
3Value adheres to specification, and forbids TCaCO
3Value exceeds a little bigger appearance of controlling index.
3, guarantee the raw material homo-effect, strengthen storehouse of machinery, carry out pneumatic blending.
4, strengthen the operation in balling-up post, bulk, following powder-material guarantee balling ratio greater than more than 80% under forbidding, and be normal to guarantee kiln ventilation.
5, add the management of trunk offering kiln coal, fineness of pulverized coal must guarantee that ash is lower than 26.5% less than 10.0% (the 0.08mm square hole sieve tails over).
Through relevant departments checks, reach following technical indicator: specific surface area 350m with the cement of aforesaid method production
2More than/the Kg, fineness is below 2.5%, and sulfur trioxide content 2.00～2.60% is tested through 250 freeze-thaw-s, and intensity reaches: 3 days intensity: anti-folding is greater than 5.0Mpa, and resistance to compression is greater than 25.0Mpa; 28 days intensity: anti-folding is greater than 7.0Mpa, and resistance to compression is greater than 50.0Mpa; Presetting period: be no earlier than 45 minutes, final setting time: less than 10 hours, loss on ignition was less than 5.0%, and content of magnesia is less than 3.0%.
Claims (5)
1, a kind of freeze-thaw resisting cement, cement technology require to reach: the presetting period: be no earlier than 45 minutes, final setting time: less than 10 hours, loss on ignition is characterized in that less than 5.0%: the technical requirements of described cement especially reaches: specific surface area 350m
2More than/the Kg, fineness is below 2.5%, sulfur trioxide content 2.00～2.60%; Through 250 freeze-thaw-experiments, intensity reaches: 3 days intensity: anti-folding is greater than 5.0Mpa, and resistance to compression is greater than 25.0Mpa; 28 days intensity: anti-folding is greater than 7.0Mpa, and resistance to compression is greater than 50.0Mpa; Content of magnesia is less than 3.0%.
2, a kind of production method of freeze-thaw resisting cement as claimed in claim 1 is carried out under general cement manufacture plant condition, and it is characterized in that: the manufacture of cement proportion scheme is: by weight ratio: grog 90～92, Wingdale 4.5～6, gypsum 4.2～5.0; SO in the gypsum
3Content greater than 40%; Grog rate value requires: KH=0.90 ± 0.02 silicon rate n=1.80 ± 0.10 iron rate p=0.90 ± 0.10.
3, Cement Production method as claimed in claim 2 is characterized in that: described clinker mineral composition requirement: C
3S＜54.0%C
2S＞20.0%C
3A＜6.0%C
4AF＞14.0%, free calcium oxide f-CaO is below 1.0%, and alkali content is lower than 0.60%.
4, as the production method of claim 2,3 described freeze-thaw resisting cements, it is characterized in that: the raw material rate value requirement is: KH=1.020 ± 0.02, silicon rate n=1.80 ± 0.10, iron rate p=0.90 ± 0.10, lime carbonate titration value TCaCO
3Be 77.50 ± 0.5%, ferric oxide titration value TFe
2O
3Be 3.70 ± 0.20%.
5, the production method of freeze-thaw resisting cement as claimed in claim 4 is characterized in that: the requirement of raw material, fuel is in the raw material preparation: calcareous raw material: CaO content is greater than 50%; Clayey raw material: alkali content is lower than 1.0%; Ferriferous raw material: Fe
2O
3Content 55.0-62.0%; Coal-fired: thermal value is greater than 23396KJ/Kg, and ash is lower than 26.5%, and fineness of pulverized coal 0.08mm square hole sieve tails over less than 10.0%.
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| CNB2006100056905A CN100334027C (en) | 2006-01-18 | 2006-01-18 | Freeze-thaw resisting cement and its production process |
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|---|---|---|---|
| CNB2006100056905A CN100334027C (en) | 2006-01-18 | 2006-01-18 | Freeze-thaw resisting cement and its production process |
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|---|---|
| CN1810696A true CN1810696A (en) | 2006-08-02 |
| CN100334027C CN100334027C (en) | 2007-08-29 |
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ID=36843841
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102285769A (en) * | 2011-06-07 | 2011-12-21 | 广州市珠江水泥有限公司 | Special high-performance cement for nuclear island and preparation method thereof |
| CN104496231A (en) * | 2014-12-29 | 2015-04-08 | 桂林理工大学 | Method for preparing high-ferric Alite-calcium barium sulphoaluminate cement by using red mud and barium mud |
| CN110436801A (en) * | 2019-09-11 | 2019-11-12 | 中国中材国际工程股份有限公司 | A kind of highly resistance folding composite Portland cement and preparation method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047579C (en) * | 1991-12-25 | 1999-12-22 | 云南省建筑材料科学研究设计院 | Production method of special cement by use of electric furnace phosphoric slag |
| CN1080622A (en) * | 1992-07-02 | 1994-01-12 | 枣庄市建筑材料科研所 | Produce road cement with the coal gangue substitute for clay |
| CN1061951C (en) * | 1997-01-08 | 2001-02-14 | 中国建筑材料科学研究院水泥所阳泉联营特种水泥厂 | Super high strength quick hardening sulfaluminous cement |
| JP2005194117A (en) * | 2004-01-05 | 2005-07-21 | Taiheiyo Cement Corp | Anti-freezing hardening material and anti-freezing hardened body containing the same |
-
2006
- 2006-01-18 CN CNB2006100056905A patent/CN100334027C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102285769A (en) * | 2011-06-07 | 2011-12-21 | 广州市珠江水泥有限公司 | Special high-performance cement for nuclear island and preparation method thereof |
| CN104496231A (en) * | 2014-12-29 | 2015-04-08 | 桂林理工大学 | Method for preparing high-ferric Alite-calcium barium sulphoaluminate cement by using red mud and barium mud |
| CN104496231B (en) * | 2014-12-29 | 2016-07-06 | 桂林理工大学 | A kind of method utilizing red mud and the clay standby high ferro Alite-barium calcium sulphoaluminate of barium |
| CN110436801A (en) * | 2019-09-11 | 2019-11-12 | 中国中材国际工程股份有限公司 | A kind of highly resistance folding composite Portland cement and preparation method |
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|---|---|
| CN100334027C (en) | 2007-08-29 |
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Granted publication date: 20070829 Termination date: 20130118 |