CN104724967A - Method for prolonging setting time of cement - Google Patents
Method for prolonging setting time of cement Download PDFInfo
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- CN104724967A CN104724967A CN201310713490.5A CN201310713490A CN104724967A CN 104724967 A CN104724967 A CN 104724967A CN 201310713490 A CN201310713490 A CN 201310713490A CN 104724967 A CN104724967 A CN 104724967A
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Abstract
The invention discloses a method for prolonging the setting time of cement. Phosphogypsum powder accounting for 8-12% of the total weight of clinker is added during grinding of cement in order to control the weight percentage of SO3. The method allows the content of SO3 in cement to be in a range of 1.6-2.4%, the initial setting time of cement to reach 330min or above, the final setting time to reach 420min or above, and has a good cement setting time prolongation effect; the content of SO3 in cement is normal, and poor stability of cement is avoided; and a material used in the invention is an industrial byproduct, so waste utilization is realized.
Description
Technical field
The present invention relates to a kind of cement manufacturing method, specifically extend the method for cement setting time.
Background technology
Have an important indicator to be the time of coagulation of cement in Cement Quality index, general purpose portland cement initial set time of coagulation is not less than 45min, and final set silicate cement final setting time is not more than 390min; Ordinary Portland cement, Portland blast furnace slag cement, Portland pozzolana cement, Portland fly ash cement and composite Portland cement final setting time are not more than 600min, in current cement production process, cement production enterprise dihydrate gypsum and industry byproduct phosphogypsum, titanium gypsum as cement setting retarder, the adjustment cement time.But in general-purpose cement, during with above-mentioned gypsum adjustment cement setting time, can between 80min to 270min on the presetting period, can between 140min to 300min on final setting time, final setting time is far below national standard.In modern concrete construction, mass concrete, due to tamping, jolt ramming demand, the time of coagulation of cement will extend, and initial set requires to reach more than 330min, and final set is greater than 420min.Current dihydrate gypsum and phosphogypsum, titanium gypsum can not meet the demands, gypsum can make extend time of coagulation, cement cannot reach this performance, simultaneously in cement SO3 high after, SO3 >=3.5%, make soundness of cement bad, existing method: cost is high, weak effect, causes soundness of cement defective.
Summary of the invention
The object of the invention is the deficiency existed for prior art, a kind of method that not only can extend cement setting time but also can ensure soundness of cement is provided.
For achieving the above object, the technical solution used in the present invention is a kind of method extending cement setting time, adds that to account for grog total weight percent be that the phosphogypsum powder of 8 ~ 12% is in order to control SO when cement grinding
3weight percent.
Described SO
3weight percent control 1.6 ~ 2.4%.
In traditional cement grinding batching, producing cement material has the materials such as grog, stone, volcanic ash, flyash, mix dihydrate gypsum, and time of coagulation is between 80min to 300min, and in the present invention, in finished ground cement batching, mixes phosphogypsum powder, and SO
3control between 1.6 ~ 2.4%, cement setting time, initial set can reach more than 330min, final set can reach more than 420min, and rises with SO3 content, and time of coagulation is extended linear length relation, this kind of cement can meet road construction, and mass concrete construction, maintenance work, improve construction quality.
Jelling time prepared by the present invention is adjusted to 420min from 45min, and cement final setting time can be adjusted to 600min from 100min, reaches unified and adjusts solidifying time requirement.And using phosphogypsum powder batching, proportioning is easy to adjust, accurately can reach the target of time of coagulation, industrial residue is utilized.
Beneficial effect: the present invention makes SO in cement
3in the scope of 1.6 ~ 2.4%, jelling time can reach more than 330min, and final setting time reaches more than 420min, extends the effective of cement setting time; SO in cement
3content is normal, soundness of cement can not be caused bad; Material therefor is industry byproduct, realizes utilization of waste material.
Embodiment
Below in conjunction with specific embodiment, illustrate the present invention further, the present embodiment is implemented under premised on technical solution of the present invention, should understand these embodiments and only be not used in for illustration of the present invention and limit the scope of the invention.
Embodiment one: the P.O42.5 class g cement that presetting period 210min and final setting time 270min are provided to certain engineering.
Grog proportioning 73.98%, volcanic ash proportioning: 5.50%, stone proportioning 4.00%, flyash proportion 8.52%, phosphogypsum powder: 8%.
Pulverizing cement: specific surface area 352m2/kg, R324.5Mp, R2850.6Mp, SO31.62%, presetting period 212min, final setting time 281min.
Embodiment two: the P.O42.5 class g cement that presetting period 390min and final setting time 450min are provided to certain engineering.
Grog proportioning 69.72%, volcanic ash: 5.50%, stone 4.00%, flyash 8.78%, phosphogypsum powder: 12%.
Pulverizing cement: specific surface area 354m2/kg, R323.8Mp, R2851.4Mp, SO32.32%, presetting period 395min, final setting time 448min.
Embodiment three: the P.O42.5 class g cement that presetting period 390min and final setting time 450min are provided to certain engineering.
Grog proportioning 72%, volcanic ash: 5.50%, stone 4.00%, flyash 8.5%, phosphogypsum powder: 10%.
Pulverizing cement: specific surface area 354m2/kg, R323.8Mp, R2851.4Mp, SO32.32%, presetting period 395min, final setting time 448min.
Claims (2)
1. extend a method for cement setting time, it is characterized in that: add when cement grinding that to account for grog total weight percent be that the phosphogypsum powder of 8 ~ 12% is in order to control SO
3weight percent.
2. a kind of method extending cement setting time according to claim 1, is characterized in that: described SO
3weight percent control 1.6 ~ 2.4%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310713490.5A CN104724967A (en) | 2013-12-20 | 2013-12-20 | Method for prolonging setting time of cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310713490.5A CN104724967A (en) | 2013-12-20 | 2013-12-20 | Method for prolonging setting time of cement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104724967A true CN104724967A (en) | 2015-06-24 |
Family
ID=53449461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310713490.5A Pending CN104724967A (en) | 2013-12-20 | 2013-12-20 | Method for prolonging setting time of cement |
Country Status (1)
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|---|---|
| CN (1) | CN104724967A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107813A (en) * | 1994-11-30 | 1995-09-06 | 桦甸市松源水泥有限公司 | Process for producing, early strength expansive cement |
| CN1213654A (en) * | 1998-10-01 | 1999-04-14 | 四川省绵竹市齐福水泥厂 | Prodn. of composite portland cement by utilizing industrial waste residue |
| CN1477072A (en) * | 2002-08-20 | 2004-02-25 | 赵洪义 | Production method of high-strength cement |
| CN1733641A (en) * | 2005-08-01 | 2006-02-15 | 宜都市海顺昌新型建筑材料有限公司 | Silicate cement and its production method |
| CN101921079A (en) * | 2010-01-19 | 2010-12-22 | 赤峰华益水泥有限责任公司 | New cement grinding process |
-
2013
- 2013-12-20 CN CN201310713490.5A patent/CN104724967A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107813A (en) * | 1994-11-30 | 1995-09-06 | 桦甸市松源水泥有限公司 | Process for producing, early strength expansive cement |
| CN1213654A (en) * | 1998-10-01 | 1999-04-14 | 四川省绵竹市齐福水泥厂 | Prodn. of composite portland cement by utilizing industrial waste residue |
| CN1477072A (en) * | 2002-08-20 | 2004-02-25 | 赵洪义 | Production method of high-strength cement |
| CN1733641A (en) * | 2005-08-01 | 2006-02-15 | 宜都市海顺昌新型建筑材料有限公司 | Silicate cement and its production method |
| CN101921079A (en) * | 2010-01-19 | 2010-12-22 | 赤峰华益水泥有限责任公司 | New cement grinding process |
Non-Patent Citations (1)
| Title |
|---|
| 陈侠: ""用磷石膏做缓凝剂生产缓凝水泥"", 《山东建材》 * |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150624 |
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| RJ01 | Rejection of invention patent application after publication |