CN1202038C - Magnesium oxide composite expanding agent - Google Patents
Magnesium oxide composite expanding agent Download PDFInfo
- Publication number
- CN1202038C CN1202038C CN 02133845 CN02133845A CN1202038C CN 1202038 C CN1202038 C CN 1202038C CN 02133845 CN02133845 CN 02133845 CN 02133845 A CN02133845 A CN 02133845A CN 1202038 C CN1202038 C CN 1202038C
- Authority
- CN
- China
- Prior art keywords
- magnesium oxide
- expanding agent
- oxide composite
- composite expanding
- mixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The present invention relates to a magnesium oxide composite expanding agent characterized in that the magnesium oxide composite expanding agent uses dolomite as raw materials, the dolomite is calcined for 60 to 120 minutes at the temperature of 1100 DEG C to 1300 DEG C, and the mixture of magnesium oxide and calcium oxide is obtained; the mixture measured by the net content of every 100 portions by weight can contain 30 to 40 portions of magnesium oxide and 45 to 60 portions of calcium oxide. A finished product of the expanding agent can be obtained after the mixture is finely ground. The expanding agent has the advantages of large expansion rate and favorable cracking preventing property. The magnesium oxide composite expanding agent can meet the limits on the use quantity of the magnesium oxide in China, and the magnesium oxide composite expanding agent has favorable effect for compensating the shrinkage of concrete with temperature drop. Particularly, the magnesium oxide composite expanding agent has favorable property for delaying expansion, and favorable effect for compensating the shrinkage with the temperature drop at the later period. The magnesium oxide composite expanding agent has the characteristics of rich raw materials for production, easy production, low production cost and favorable product performance, so the magnesium oxide composite expanding agent can be used for the construction engineering of concrete.
Description
Technical field: the present invention relates to the swelling agent that a kind of concrete construction is used.
Background technology: in concrete such as the affined big storehouse of Hydraulic and Hydro-Power Engineering mass concrete and worker China Democratic National Construction Association face, big plate.Because the hydration heat of cement can make concrete internal temperature rise to 40 ℃～50 ℃, even reaches about 70 ℃.Along with time duration, temperature descends gradually afterwards, and volumetric shrinkage when having external constraint and temperature difference between inside and outside concrete excessive, can produce bigger tensile stress, tends to cause that works produces surface crack and penetrability crack.In order to prevent to produce the crack, common way is to add swelling agent in concrete construction, in order to the temperature drop contraction of compensating concrete.Swelling agent commonly used at present mainly contains magnesium oxide swelling agent and ettringite class swelling agent two big classes.Though the performance that magnesium oxide swelling agent compensation temperature drop shrinks is good, its consumption is subjected to national regulation restriction (ratio is not more than 5%), therefore can not satisfy the requirement that the compensation temperature drop shrinks fully.Ettringite class swelling agent is then because speed of response is too fast, and is low in the rate of expansion in concrete cooling stage, and the compensating action that temperature drop is shunk is not as the magnesium oxide swelling agent.
Summary of the invention: the objective of the invention is to, a kind of magnesium oxide composite expanding agent is provided, it both can satisfy country to the magnesium oxide quantitative limitation, had the effect that extraordinary compensating concrete temperature drop shrinks again.
Technical scheme of the present invention: with dolomite is raw material, and dolomite 1100 ℃～1300 ℃ temperature calcinings 60～120 minutes, is obtained the mixture of magnesium oxide and calcium oxide; By per 100 weight part net contents, should contain 30～40 parts in magnesium oxide in the mixture, 45～60 parts in calcium oxide; With mixture after levigate the finished product swelling agent.
Compared with the prior art, the present invention is a raw material with the profuse dolomite of resource, and the magnesium oxide that will obtain by certain requirement calcining, calcium oxide mixture are as swelling agent.Swelling agent rate of expansion of the present invention is big, and anti crack performance is good, both can satisfy country to the magnesium oxide quantitative limitation, has the effect that extraordinary compensating concrete temperature drop shrinks again.Particularly its good delayed expansion performance has extraordinary post compensation temperature drop contractive effect.It is abundant to have raw materials for production, is easy to produce, and production cost is low, the characteristics of good product performance.Can be used in the concrete construction engineering.
Embodiment:
Embodiment.Dolomite (being also referred to as rhombspar) is raw material, and dolomite 1100 ℃～1300 ℃ temperature calcinings 60～120 minutes, is obtained the mixture of magnesium oxide and calcium oxide; By 100 weight part net contents, should contain 37 parts in magnesium oxide in the mixture, 55 parts in calcium oxide, other 8% is an impurity, if 37 parts of content of magnesia less thaies in the mixture that calcining is come out can be added light calcined magnesia and be supplied umber; With mixture press the swelling agent standard after levigate the finished product swelling agent.During use, can mix swelling agent by 8～12% of cement consumption according to the magnesium oxide quantitative limitation.
Claims (1)
1, magnesium oxide composite expanding agent is characterized in that: be raw material with dolomite, dolomite 1100 ℃～1300 ℃ temperature calcinings 60～120 minutes, is obtained the mixture of magnesium oxide and calcium oxide; By per 100 weight part net contents, should contain 30～40 parts in magnesium oxide in the mixture, 45～60 parts in calcium oxide; With mixture after levigate the finished product swelling agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02133845 CN1202038C (en) | 2002-09-27 | 2002-09-27 | Magnesium oxide composite expanding agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02133845 CN1202038C (en) | 2002-09-27 | 2002-09-27 | Magnesium oxide composite expanding agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1412144A CN1412144A (en) | 2003-04-23 |
| CN1202038C true CN1202038C (en) | 2005-05-18 |
Family
ID=4747419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02133845 Expired - Fee Related CN1202038C (en) | 2002-09-27 | 2002-09-27 | Magnesium oxide composite expanding agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1202038C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102092976B (en) * | 2011-01-17 | 2013-04-10 | 南京航空航天大学 | Mass eco-concrete expansive agent and preparation method thereof |
| CN103553479B (en) * | 2013-09-24 | 2015-12-23 | 河北达奥达建材科技有限公司 | A kind of low-viscosity neutrel grouting material that can be used for the industries such as nuclear power |
| CN109133696A (en) * | 2018-09-17 | 2019-01-04 | 佛山朝鸿新材料科技有限公司 | A kind of preparation method of cement expansive material |
| CN110066129B (en) * | 2019-04-30 | 2021-08-03 | 镇江苏博特新材料有限公司 | Calcium-magnesium composite expanding agent and preparation method thereof |
| CN110066127B (en) * | 2019-04-30 | 2021-08-03 | 镇江苏博特新材料有限公司 | Calcium-magnesium composite expanding agent for ultra-long and ultra-thick structural concrete and preparation method thereof |
| CN110066123B (en) * | 2019-04-30 | 2020-11-17 | 镇江苏博特新材料有限公司 | Method for preparing light magnesium oxide and calcium oxide and application of light magnesium oxide and calcium oxide in preparation of calcium-magnesium composite expanding agent |
| CN111943549A (en) * | 2020-07-21 | 2020-11-17 | 北京水木佳维科技有限公司 | Magnesium oxide composite expanding agent and preparation method thereof |
-
2002
- 2002-09-27 CN CN 02133845 patent/CN1202038C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1412144A (en) | 2003-04-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018028225A1 (en) | Fly ash based geopolymer grouting material and preparation method therefor | |
| CN104961415B (en) | Concrete crack resistance silicon waterproof agent | |
| CN105330182A (en) | White fast-setting, fast-hardening and high-belite sulphoaluminate cement clinker, and application and production technology thereof | |
| CN104909596B (en) | High efficiency composite expanding agent for high-strength self-stressing concrete filled steel tube and preparation method thereof | |
| CN103803918A (en) | Porcelain powder waste mixed cement-based tiny-expansion crack repairing mortar and using method thereof | |
| CN111606612B (en) | Alkali-activated cementitious materials and methods of use thereof | |
| CN101628802A (en) | Composite inorganic heat insulation and waterproof mortar and application thereof | |
| CN103803939A (en) | Geopolymer based fibreboard | |
| CN112960958B (en) | Sealing slurry for winter assembly type construction and preparation method thereof | |
| CN105110745B (en) | Sweet rice tabia for perfusion and preparation method therefor | |
| CN103030321A (en) | Expanding agent, post-tensioning prestressed concrete porelike grouting agent and grouting material | |
| CN1202038C (en) | Magnesium oxide composite expanding agent | |
| CN108117347A (en) | A kind of fibre reinforced concrete Rapid Repairing Material for Read Surface and preparation method | |
| CN104649643A (en) | Modified desulfurized gypsum based slurry for permanent composite heat preservation formwork | |
| CN103145353A (en) | Low-heat anti-cracking portland cement | |
| CN114634338A (en) | High-ductility cement-based composite material for wind-blown sand in desert and preparation method thereof | |
| CN106186959A (en) | A kind of regenerative micro powder mortar and preparation method thereof | |
| CN1258653A (en) | Composite portland cement | |
| CN108455921B (en) | Preparation method of fly ash brick | |
| CN108530006B (en) | Reinforcing steel bar sleeve grouting material for assembly type structure connection and preparation method thereof | |
| CN109665773A (en) | A kind of clinker replaces the C80 high-strength concrete of fine aggregate | |
| CN101774772A (en) | Composite gypsum material for construction | |
| CN1453234A (en) | Ardealite curing modification process | |
| CN111943549A (en) | Magnesium oxide composite expanding agent and preparation method thereof | |
| CN110845200A (en) | Light high-strength thin-wall structure cast-in-place concrete |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |