CN105254198A - Retarder for phosphate cement and application method thereof - Google Patents
Retarder for phosphate cement and application method thereof Download PDFInfo
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- CN105254198A CN105254198A CN201510592934.3A CN201510592934A CN105254198A CN 105254198 A CN105254198 A CN 105254198A CN 201510592934 A CN201510592934 A CN 201510592934A CN 105254198 A CN105254198 A CN 105254198A
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- phosphate cement
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Abstract
The invention specifically relates to a composite additive capable of substantially prolonging the setting time of phosphate cement without influencing the strength and durability of the phosphate cement, belonging to the technical field of additives for phosphate cement. The phosphate cement has the characteristic of a fast setting speed; however, problems in application of the phosphate cement have not been overcome so far, so the phosphate cement has not gain enough attention and research for a long time. The composite additive provided by the invention comprises 25 to 45% of 3-methyl-3-oxetanemethanol and 55 to 75% of tetramethylammonium tetrafluoroborate, and the percentages of the above-mentioned components sum to 100%; the doping amount of the additive is 0.8 to 2.0% of the total weight of magnesium oxide and potassium dihydrogen phosphate, setting time can be adjusted by controlling the doping amount; and the additive has the characteristics of a low doping amount, good adjusting effect, low cost, etc.
Description
Technical field:
The invention belongs to phosphate cement admixture technical field, be exactly a kind of energy significant prolongation Setting Time of Magnesia-Phosphate Cement specifically, but do not affect the compound additive of its intensity and weather resistance.
Background technology:
Phosphate cement is formulated by a certain percentage by phosphoric acid salt, retardant and mineral admixture.Magnesium oxide wherein as one of raw material is formed through high-temperature calcination by magnesiumcarbonate, general about 1700 DEG C of calcining temperature.Phosphoric acid salt produces the another kind of important raw and processed materials of phosphate cement to be mainly hydration reaction and to provide hydrogen ion and phosphate anion, and its hydrated product is mainly struvite.Due to phosphate cement hydration reaction speed quickly, early strength is high, be particularly suitable for the Rapid-Repair of engineering, the eighties western developed country such as U.S. utilize the feature of MPC rapid hardening high-strength, it in a large number for concrete road surface, i.e. in the quick reparation of highway, bridge floor, airstrip and industrial plant ground etc.Phosphate cement has following characteristic: 1. quick setting and rapid hardening, gets final product final set at about 2-3 minute; 2. early strength is higher, and 1h ultimate compression strength can reach more than 30Mpa, and 3h ultimate compression strength can reach more than 50Mpa; 3. cryogenic temperature condensation speed is fast, can condense rapidly in the low temperature environment of-20 DEG C; 4. high with the bonding strength of old concrete, do not need to re-use interface adhesive; 5. wear resistance and frost resistance good, drying shrinkage is little.
To be exceedingly fast feature because phosphate cement has rate of set, this two problems is never well solved, cause its for a long time phosphate cement be not all subject to the enough attention of people and research, and just it limited is applied on road repair cement, make its excellent characteristic do not played in the larger context and to utilize.The application of phosphate cement is caused to have significant limitation.
The retardant being applied to phosphate cement at present mainly contains borax, boric acid, sodium polyphosphate.But the result of use of above-mentioned retardant is not very desirable, there are some problems, such as, the volume of borax in phosphate cement is very large, and up to more than 15%, cost is very high; The retarding effect of sodium polyphosphate is undesirable, the sodium polyphosphate of admixture 4%, and the time of coagulation of phosphate cement can only extend to 10 minutes.
Summary of the invention:
For the weak point of above-mentioned existing retardant, the object of the invention is to prepare a kind of compound retarder, this retardant can under the prerequisite not affecting its intensity, weather resistance, cohesive strength, the significant time of coagulation extending phosphate cement, and volume is lower.
To achieve these goals, the solution of the present invention is: a kind of phosphate cement retardant, is characterized in that, the mass percent of each component is: 3-methyl-3-oxetane methanol accounts for 25%-45%, tetramethyl-ammonium tetrafluoroborate accounts for 55%-75%, and above-mentioned component sum is 100%.
Using method: 3-methyl-3-oxetane methanol and tetramethyl-ammonium tetrafluoroborate Homogeneous phase mixing are made compound retarder by above-mentioned mass percent, according to the strength grade of phosphate cement, the volume determining compound additive time of coagulation, its volume is the 0.8-2.0% of magnesium oxide and potassium primary phosphate gross weight, the height of volume can regulate time of coagulation, reach volume low, the features such as regulating effect is good, and cost is low.
Embodiment:
Mass percent by the present invention's formula: 3-methyl-3-oxetane methanol accounts for 25%-45%, and tetramethyl-ammonium tetrafluoroborate accounts for 55%-75%.Proportionally mix and prepare compound retarder.According to the strength grade of phosphate cement, the volume determining compound additive time of coagulation, its volume is the 0.8-2.0% of magnesium oxide and potassium primary phosphate gross weight.
The phosphate cement proportioning of not mixing compound retarder is: magnesium oxide 1042g, potassium primary phosphate 708g.Magnesium oxide is 325 orders, and potassium primary phosphate purity is 98%.Compound additive ways added is for mixing for radix is outer in proportion with magnesium oxide and potassium primary phosphate gross weight.
Embodiment 1
Admixture formula is: 3-methyl-3-oxetane methanol accounts for 25%, and tetramethyl-ammonium tetrafluoroborate accounts for 75%.
Embodiment 2
Admixture formula is: 3-methyl-3-oxetane methanol accounts for 45%, and tetramethyl-ammonium tetrafluoroborate accounts for 55%.
Embodiment 3
Admixture formula is: 3-methyl-3-oxetane methanol accounts for 35%, and tetramethyl-ammonium tetrafluoroborate accounts for 65%.
Claims (2)
1. a phosphate cement retardant, is characterized in that, the mass percent of each component is: 3-methyl-3-oxetane methanol accounts for 25%-45%, and tetramethyl-ammonium tetrafluoroborate accounts for 55%-75%, and above-mentioned component sum is 100%.
2. a phosphate cement retardant and using method, it is characterized in that, by above-mentioned mass percent, 3-methyl-3-oxetane methanol and tetramethyl-ammonium tetrafluoroborate Homogeneous phase mixing are made compound retarder, according to the strength grade of phosphate cement, the volume determining compound additive time of coagulation, its volume is the 0.8-2.0% of magnesium oxide and potassium primary phosphate gross weight, and the height of volume can regulate time of coagulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510592934.3A CN105254198A (en) | 2015-09-12 | 2015-09-12 | Retarder for phosphate cement and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510592934.3A CN105254198A (en) | 2015-09-12 | 2015-09-12 | Retarder for phosphate cement and application method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105254198A true CN105254198A (en) | 2016-01-20 |
Family
ID=55094204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510592934.3A Pending CN105254198A (en) | 2015-09-12 | 2015-09-12 | Retarder for phosphate cement and application method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105254198A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103113131A (en) * | 2013-03-01 | 2013-05-22 | 北京中铁润海科技有限公司 | Inorganic cementing material retarding method |
| CN104803655A (en) * | 2015-04-16 | 2015-07-29 | 同济大学 | Method for producing cement-based composite material for injection reinforcement from waste incineration fly ash |
-
2015
- 2015-09-12 CN CN201510592934.3A patent/CN105254198A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103113131A (en) * | 2013-03-01 | 2013-05-22 | 北京中铁润海科技有限公司 | Inorganic cementing material retarding method |
| CN104803655A (en) * | 2015-04-16 | 2015-07-29 | 同济大学 | Method for producing cement-based composite material for injection reinforcement from waste incineration fly ash |
Non-Patent Citations (4)
| Title |
|---|
| 李悦等: "磷酸镁水泥的研究进展", 《建材世界》 * |
| 杜磊等: "化学结合磷酸镁胶凝材料的研究及应用现状", 《水泥》 * |
| 雒亚莉: "新型早强磷酸镁水泥的试验研究和工程应用", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
| 黄天勇: "微量化学外加剂对硅酸盐水泥强度的影响及作用机理", 《中国博士学位论文全文数据库 工程科技Ⅰ辑》 * |
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Application publication date: 20160120 |
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| WD01 | Invention patent application deemed withdrawn after publication |