CN1036940A - The compound method of high-strength special pulverized fuel ash cement and compound thereof early - Google Patents
The compound method of high-strength special pulverized fuel ash cement and compound thereof early Download PDFInfo
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- CN1036940A CN1036940A CN 88102201 CN88102201A CN1036940A CN 1036940 A CN1036940 A CN 1036940A CN 88102201 CN88102201 CN 88102201 CN 88102201 A CN88102201 A CN 88102201A CN 1036940 A CN1036940 A CN 1036940A
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- Prior art keywords
- cement
- compound
- days
- pulverized fuel
- strength
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
Abstract
The invention provides the compound method of a kind of early stage high-strength special type pulverized fuel ash cement and compound thereof.Mainly by Portland clinker 60～80%, flyash 20～40%, hydrofluoric acid dehydrated gyp-2～8%, yellow soda ash 0.5～2.5% is mixed into and grinds.Its ultimate compression strength 1 day be 145～147 kgfs/centimetre
2, 3 days be 254～263 kgfs/centimetre
2, 28 days be 490～502 kgfs/centimetre
2, early strength enhancement rate was 50.6～53.7% in 3 days/28 days.Folding strength is higher than 525 and 625 label silicate cements, and its technology is simple, and cost is low, and time of coagulation is normal, and good fluidity is easy to pouring, be applicable to large volume, under water, worker, China Democratic National Construction Association's engineering construction operation.Because of it is big with the flyash amount, help environment protection.
Description
The invention belongs to building material technical field.
Pulverized fuel ash cement has generally that hydration heat is low, and drying shrinkage is little, and mortar fluidity is big, is easy to characteristics such as pouring, and its anti-sulphates corrosive is stronger than Portland cement, is particularly useful for buildings such as mass concrete, underground works.But its volume of this cement is often many not as good as the slag cement volume, and early strength is lower than slag cement, so the also glad use of user generally is reluctant to produce by cement producer.
" cement physical properties and check thereof " first volume (national construction material is learned research institute cement institute and published June nineteen eighty-two) book is described: " because flyash is through high-temperature fusion; so its structure is very fine and close; it is still similar with the trass cement hydration process only to manage its hydration process, but hydration rate then will be slowly many.The result of study that has shows that fly ash grain approximately had only 1/3 to carry out aquation through 1 year, and slag cement aquation 1/3 then only needs 90 days, and in fact the activity of flyash will be treated just to bring into play significantly later in three months.”
" fly ash in electric power plant comprehensive utilizating research " (Jiangsu Province Inst. of Science ﹠ Technology Information wears upright people's comprehensive improvement) book is described: " at present; the many application of powdered coal cinder on material of construction is produced; also very immature; as only to be preliminary; in order to adapt to the needs of material of construction development; greatly develop the fly ash silicate materials for wall, will concentrate strength on capturing the low technical barrier of high-strength special fly ash cement strength in the recent period.”
At present, pulverized fuel ash cement production both at home and abroad is very few, but the quantity of flyash is a lot.The flyash that China stores up has reached more than 400,000,000 ton, takes up an area of more than 10 ten thousand mu, simultaneously annually increasing with 4,000,000 tons speed again, and the utilization of coal ash rate is very low, only has only 22%.The reason that the total utilization of PCA rate is low has many, and with regard to pulverized fuel ash cement, the key that can not apply is that its early strength is too low.
In country's cement standard, regulation allows to mix the flyash that is no more than cement weight 15% in slag cement and replaces slag.Under the more nervous situation of slag supply, the producer that produces cement also is unwilling to come the instead of part slag to use with flyash at present, because of being afraid of that influencing early strength reduces cement mark.Because the low cause of pulverized fuel ash cement early strength, it not only influences the production of pulverized fuel ash cement, has also influenced the production of slag cement simultaneously.
" in the spy also husband's novel concrete " that " Inner Mongolia technology newspaper " (version on December 15th, 1981) discloses, its early strength is higher than the ordinary Portland cement with label, has good use properties.But its complex manufacturing has especially been added caustic soda and has been made exciting agent, and this has certain corrosive nature to steel bars in concrete.
The object of the present invention is to provide the compound method of a kind of early stage high-strength special type pulverized fuel ash cement and compound thereof.
The present invention is achieved in that because the main active component in the flyash is SiO
2And Al
2O
3, when these active ingredients meet water at normal temperatures and Ca(OH)
2Effect, generate stable compound with gelating property.CaO content in the flyash is often all on the low side, the Ca(OH that is generated when aquation)
2Amount is same as SiO far from
2And Al
2O
3Match and generate have the gelating property stable compound in a large number.Here it is, and the pulverized fuel ash cement hydration rate is slow, the principal element that early strength is low.
According to this principal element, thus the present invention to have selected the by product-hydrofluoric acid dehydrated gyp-2～8%(that produces hydrofluoric acid for use be industry by-product gypsum) make main additive.The main chemical compositions of hydrofluoric acid dehydrated gyp-is: CaO, SO
3And CaF
2, wherein CaO content accounts for (weight percent): 40～43%, and SO
3And CaF
2Content accounts for (weight percent): 48～55%.Proofread and correct the deficiency that contains the CaO amount in the flyash like this, thereby improved the content of calcium aluminate and Calucium Silicate powder.Raising to the pulverized fuel ash cement early strength has vital role.Except that adding the hydrofluoric acid dehydrated gyp-, also to add 0.5～2.5% yellow soda ash, be beneficial to promote that the fast of cement coagulates soon firmly.
Following table is that cement physical properties of the present invention detects data
The 630 label Portland clinkers 65% that cement in the above-mentioned table has selected for use cross cement mill, Zunyi City, Guizhou Province to produce mix the flyash 35% in fuel-burning power plant, zunyi, guizhou province, and it is formulated to add an amount of hydrofluoric acid dehydrated gyp-and yellow soda ash.
The early strength enhancement rate of numbering I and II is 50.6% and 53.7% in the above-mentioned table, and its folding strength is more outstanding, with regard to folding strength 3 days and 28 days, number I be higher than No. 625 silicate cements (No. 625 silicate cements 3 days be 50 kgfs/centimetre
2, 28 days be 80 kgfs/centimetre
2), the numbering II be higher than No. 525 silicate cements (No. 525 silicate cements 3 days be 42 kgfs/centimetre
2, 28 days be 72 kgfs/centimetre
2).
Pulverized fuel ash cement salient features of the present invention is compared with at present domestic and international pulverized fuel ash cement has certain superiority, and its grindability is good, and time of coagulation is normal, and good fluidity is easy to pouring, helps construction operation.
The invention solves that the pulverized fuel ash cement early strength is on the low side for a long time, the key issue that checks the growth of production is for the development of pulverized fuel ash cement and slag cement provides new technology.It has not only kept the original premium properties of pulverized fuel ash cement, has possessed early stage and final high-intensity property simultaneously.Be applicable to large volume, underwater engineering, general industry, civil building engineering.
The present invention is because of big with the flyash amount, and this offsets except that flyash and becomes treasured by public hazards, and enabling environment protection and development of economic construction will play earth shaking economic results in society.
When preparing compound of the present invention,, add this additive of hydrofluoric acid dehydrated gyp-2～8%(again and can prepare voluntarily with Portland clinker 60～80%, flyash 20～40%) and yellow soda ash 0.5～2.5%, mixing is together gone into to grind and being formed.
The compound method of compound of the present invention is one step completed, and its technology is easy.Because of having added the hydrofluoric acid dehydrated gyp-, replaced the dihydrate gypsum of required interpolation in the general grog, so cost is low, with compare with the silicate cement of label low more than 20%.
When preparing compound of the present invention, should control cement fineness and tail over below 12% or 12%, can improve mill hourly output like this at 0.080 millimeter square hole.
Claims (4)
1, a kind of morning, the high-strength special pulverized fuel ash cement was made up of Portland clinker and flyash, it is characterized in that being mixed with hydrofluoric acid dehydrated gyp-and yellow soda ash.
2, pulverized fuel ash cement according to claim 1 is characterized in that the main chemical compositions CaO of the hydrofluoric acid dehydrated gyp-that mixed accounts for (weight percent): 40～43%, SO
3And CaF
2Account for (weight percent): 48～55%.
3, a kind of morning the high-strength special powdered coal ash and cement mixing material compound method, it is characterized in that Portland clinker accounts for (weight percent): 60～80%, flyash accounts for (weight percent): 20～40%, the hydrofluoric acid dehydrated gyp-accounts for (weight percent): 2～8%, yellow soda ash accounts for (weight percent): 0.5～2.5%.
4, the compound method of compound according to claim 3 is characterized in that cement fineness is controlled at 0.080 millimeter square hole and tails over below 12% or 12%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88102201 CN1036940A (en) | 1988-04-13 | 1988-04-13 | The compound method of high-strength special pulverized fuel ash cement and compound thereof early |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88102201 CN1036940A (en) | 1988-04-13 | 1988-04-13 | The compound method of high-strength special pulverized fuel ash cement and compound thereof early |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1036940A true CN1036940A (en) | 1989-11-08 |
Family
ID=4832053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88102201 Pending CN1036940A (en) | 1988-04-13 | 1988-04-13 | The compound method of high-strength special pulverized fuel ash cement and compound thereof early |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1036940A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049199C (en) * | 1995-08-16 | 2000-02-09 | 曹龙 | Process for producing high strength multifunctional cement |
| CN1069294C (en) * | 1997-09-25 | 2001-08-08 | 潘智生 | Method for manufacturing high-early flyash cement concrete |
| CN1110460C (en) * | 1999-06-25 | 2003-06-04 | 孟云芳 | Composite cement |
-
1988
- 1988-04-13 CN CN 88102201 patent/CN1036940A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049199C (en) * | 1995-08-16 | 2000-02-09 | 曹龙 | Process for producing high strength multifunctional cement |
| CN1069294C (en) * | 1997-09-25 | 2001-08-08 | 潘智生 | Method for manufacturing high-early flyash cement concrete |
| CN1110460C (en) * | 1999-06-25 | 2003-06-04 | 孟云芳 | Composite cement |
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |