CN104671687A - Concrete expansive agent and preparation method thereof - Google Patents
Concrete expansive agent and preparation method thereof Download PDFInfo
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- CN104671687A CN104671687A CN201510033603.6A CN201510033603A CN104671687A CN 104671687 A CN104671687 A CN 104671687A CN 201510033603 A CN201510033603 A CN 201510033603A CN 104671687 A CN104671687 A CN 104671687A
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Abstract
The invention provides a concrete expansive agent. The concrete expansive agent is composed of limestone, magnesite, gypsum, iron residues and disperse ash. The invention simultaneously provides a preparation method of the concrete expansive agent. The preparation method comprises the steps of preparing raw materials, roasting clean coal, quenching, grinding, selecting and packaging. The concrete expansive agent prepared by the invention has high expansion rate, anti-weathering ability of clinkers and anti-crack and anti-penetration capability.
Description
Technical field
The present invention relates to concrete field, particularly relate to a kind of cement expansive material and preparation method thereof.
Background technology
Cement expansive material is a kind of chemical admixture, is added in concrete, and when concrete coagulation hardens, volumetric expansion thereupon, plays compensate for shrinkage and tension reinforcing steel bar produces prestress and abundant fill concrete gap.Current domestic existing swelling agent is all that to belong to hydrated calcium aluminate sulfate be the ettringite type swelling agent in main expansion source mostly, calcium oxide is applied at Japanese invention at first as a kind of expansive clinker, but in use easily produce the burning calcium oxide of crystalline structure dense non-porous, the reactive behavior of this burning calcium oxide is low, the hydration reaction time length is long, concrete structure can be destroyed, affect concrete weather resistance.
Chinese patent CN103130437B discloses a kind of gypsum and calcium oxide melt inclusions expansive clinker, cement expansive material and preparation method thereof and application, by the collocation that Wingdale, gypsum and aluminum oxide and/or Tai-Ace S 150 mix grinding high temperature are burnt, then use after this grog grinding, there is good rate of expansion, weatherability and cracking resistance, the function such as impervious, but its technical process is complicated, and high expensive, Wingdale pyroreaction by product problem does not solve.Chinese patent C101333083A discloses a kind of calcium oxide swelling agent, using calcium hydroxide and ettringite two kinds of hydrated products as expansion sources, increase expansion character, but due to its aquation need set large quantity of moisture, cause the shrinkage-compensating limited use under concrete drying conditions.Chinese patent CN85100902B discloses a kind of preparation method of cement expansive material, Wingdale, clay and ferriferous raw material is adopted to prepare burden in proportion, through being sintered into expansive clinker, then swelling agent is become with natural alumstone with dihydrate gypsum intergrinding, but this swelling agent weatherability is poor, shelf-time is short, the easy dead roasting of calcium oxide.
Summary of the invention
Single in order to solve cement expansive material expansion sources, the problem of easy dead roasting, we have proposed a kind of cement expansive material and preparation method thereof, adopts the present invention can have good grog rate of expansion, and weatherability, the impervious function of cracking resistance.
The present invention is achieved by the following technical solutions:
For achieving the above object, the invention provides a kind of cement expansive material, be made up of the raw material of following mass percent: Wingdale: 35-68%; Magnesia: 20-40%; Gypsum: 5-10%; Scum: 2-5%; Disperse grey: 5-15%; Each raw material granularity is all not more than 0.088mm.Wingdale is as expansion sources, if calcining temperature is too low, there will be hydrated product water requirement large, the situation that expansion efficiency lower velocity is slow, if calcining temperature is too high, then easily produces burn-off phenomenon.Magnesia is as conventional refractory raw material, can react with sulfurous gas in the process of calcium oxide mature calcined material, clinker burning temperature can be made to carry out improving and not producing calcium oxide burn-off phenomenon, and simultaneously magnesia calcinate can improve the weathering resistance of grog, cracking resistance and impermeability.Scum is the slag produced in iron manufacturing process, has higher iron oxide content.
Preferably, in above-mentioned Wingdale, CaO content is not less than 55%, and in magnesia, content of MgO is no less than 95%, SO in gypsum
3content is not less than 50%, Fe in scum
2o
3be not less than 60%.
Preferably, above-mentioned disperse grey is that the porous zeolite of 1:0.5-0.8 and flyash form by mass ratio.
Preferably, the porosity of above-mentioned porous zeolite is not less than 30%, and flyash water demand ratio is below 95%.
The present invention provides a kind of preparation method of cement expansive material simultaneously, and step is as follows:
(1) preparation of raw material: Wingdale, magnesia, gypsum and scum are sent in proportion stirring and evenly mixing 5-10 minute in sand mill;
(2) cleaned coal calcining: the raw material mixed in step (1) is sent into rotary kiln, calcine 0.5-2.5h at 1300-1700 DEG C;
(3) quenching: the raw material after calcining is placed in air quenching, obtains swelling agent grog;
(4) grinding: mixed with disperse grey by grog, carries out grinding, is not more than 0.08mm to granularity, and square hole sieve tails over rate and is not more than 5-8%;
(5) choose, inspection, packaging warehouse-in.
Preferably, the specific surface area of above-mentioned cement expansive material is 250-450m
2/ kg.
Compared with prior art, beneficial effect of the present invention is, has good rate of expansion, grog weatherability and cracking resistance impermeability.
Embodiment
Below in conjunction with embodiment, further illustrate content of the present invention.Should be appreciated that enforcement of the present invention is not limited to the following examples, any pro forma accommodation make the present invention or change all fall into scope; And the method in following embodiment, if no special instructions, be the ordinary method of this area.
Embodiment 1:
A kind of cement expansive material, is made up of the raw material of following mass percent: Wingdale: 59%; Magnesia: 20%; Gypsum: 8%; Scum: 3%; Porous zeolite: 6%; Flyash: 4%, each raw material granularity is all not more than 0.088mm.
Production stage is as follows:
(1) preparation of raw material: Wingdale, magnesia, gypsum and scum to be sent in proportion in sand mill stirring and evenly mixing 10 minutes;
(2) cleaned coal calcining: the raw material mixed in step (1) is sent into rotary kiln, calcine 1.5h at 1400 DEG C;
(3) quenching: the raw material after calcining is placed in air quenching, obtains swelling agent grog;
(4) grinding: mixed with porous zeolite, flyash by grog, carries out grinding, is not more than 0.08mm to granularity, and square hole sieve tails over rate and is not more than 5-8%;
(5) choose, inspection, packaging warehouse-in.Random sampling ten parts, detects each performance.
Embodiment 2:
A kind of cement expansive material, is made up of the raw material of following mass percent: Wingdale: 49%; Magnesia: 30%; Gypsum: 8%; Scum: 3%; Porous zeolite: 6%; Flyash: 4%, each raw material granularity is all not more than 0.088mm.
Production stage is substantially the same manner as Example 1.After completing, high-temperature behavior test is carried out in random sampling 10 parts.
Embodiment 3:
A kind of cement expansive material, is made up of the raw material of following mass percent: Wingdale: 39%; Magnesia: 40%; Gypsum: 8%; Scum: 3%; Porous zeolite: 6%; Flyash: 4%, each raw material granularity is all not more than 0.088mm.
Production stage is substantially the same manner as Example 1.After completing, high-temperature behavior test is carried out in random sampling 10 parts.
Comparative example:
Commercial take calcium oxide as the cement expansive material of expansion sources, and high-temperature behavior test is carried out in random sampling 10 parts.
Examination criteria:
Detect each component concentration in raw material, result is as shown in table 1.
Detect each component concentration in grog, result is as shown in table 2.
Check limited expansion rate by GB23439-2009, result is as shown in table 3.
Use identical concrete material, admix embodiment 1, embodiment 2, embodiment 3 and comparative example as additive, detect its concrete impervious grade by GB 50164, result is as shown in table 3.
Grog is placed in respectively 10 DEG C, 20 DEG C and 25 DEG C, in the environment of relative humidity 90%-95%, record grog weathering disintegration time, result is as shown in table 4.
Table 1:
Table 2:
Table 3:
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example | |
| Limited expansion rate (%) | 0.068±0.023 | 0.063±0.030 | 0.059±0.027 | 0.045±0.043 |
| Seepage-resistant grade (P) | 6-8 | 6-9 | 7-9 | 3-5 |
Table 4:
| 10 DEG C of weathering disintegration time (my god) | 20 DEG C of weathering disintegration time (my god) | 25 DEG C of weathering disintegration time (my god) | |
| Embodiment 1 | 34±2 | 29±2 | 25±4 |
| Embodiment 2 | 36±3 | 30±2 | 28±5 |
| Embodiment 3 | 39±3 | 34±4 | 32±3 |
| Comparative example | 18±5 | 13±6 | 9±3 |
As seen from table, use the cement expansive material that the present invention manufactures, high at all more commercial common calcium oxide source swelling agent of limited expansion rate, impermeability and fastness to efflorescence, and along with the raising of magnesia content, anti-permeability performance and weathering resistance performance rise to some extent.
Claims (6)
1. a cement expansive material, is characterized in that, is made up of the raw material of following mass percent:
Wingdale: 35-68%;
Magnesia: 20-40%;
Gypsum: 5-10%;
Scum: 2-5%;
Disperse grey: 5-15%;
Each raw material granularity is all not more than 0.088mm.
2. a kind of cement expansive material as claimed in claim 1, is characterized in that, in described Wingdale, CaO content is not less than 55%, and in magnesia, content of MgO is no less than 95%, SO in gypsum
3content is not less than 50%, Fe in scum
2o
3be not less than 60%.
3. a kind of cement expansive material as claimed in claim 1, is characterized in that, described disperse grey is that the porous zeolite of 1:0.5-0.8 and flyash form by mass ratio.
4. a kind of cement expansive material as claimed in claim 1, is characterized in that, the porosity of described porous zeolite is not less than 30%, and flyash water demand ratio is below 95%.
5. a preparation method for cement expansive material, is characterized in that, step is as follows:
(1) preparation of raw material: Wingdale, magnesia, gypsum and scum are sent in proportion stirring and evenly mixing 5-10 minute in sand mill;
(2) cleaned coal calcining: the raw material mixed in step (1) is sent into rotary kiln, calcine 0.5-2.5h at 1300-1700 DEG C;
(3) quenching: the raw material after calcining is placed in air quenching, obtains swelling agent grog;
(4) grinding: mixed with disperse grey by grog, carries out grinding, is not more than 0.08mm to granularity, and square hole sieve tails over rate and is not more than 5-8%;
(5) choose, inspection, packaging warehouse-in.
6. the preparation method of a kind of cement expansive material as claimed in claim 5, is characterized in that, the specific surface area of described cement expansive material is 250-450m
2/ kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510033603.6A CN104671687A (en) | 2015-01-23 | 2015-01-23 | Concrete expansive agent and preparation method thereof |
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| CN201510033603.6A CN104671687A (en) | 2015-01-23 | 2015-01-23 | Concrete expansive agent and preparation method thereof |
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ID=53307343
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112110707A (en) * | 2019-06-20 | 2020-12-22 | 武汉三源特种建材有限责任公司 | Hydration regulation and control type expansion clinker and preparation thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002060261A (en) * | 2000-08-11 | 2002-02-26 | Denki Kagaku Kogyo Kk | Cement admixture and cement composition |
| CN1772691A (en) * | 2005-09-22 | 2006-05-17 | 武汉理工大学 | A Method of Precisely Controlling the Expansion of Steel Tube Concrete |
| CN101250035A (en) * | 2008-03-21 | 2008-08-27 | 西安建筑科技大学 | Expansion agent for cement or concrete and preparation method thereof |
| CN101597149A (en) * | 2008-06-04 | 2009-12-09 | 俞金波 | Swelling agent |
| CN101774777A (en) * | 2010-01-26 | 2010-07-14 | 江苏博特新材料有限公司 | Preparation method of calcium oxide expansion agents |
-
2015
- 2015-01-23 CN CN201510033603.6A patent/CN104671687A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002060261A (en) * | 2000-08-11 | 2002-02-26 | Denki Kagaku Kogyo Kk | Cement admixture and cement composition |
| CN1772691A (en) * | 2005-09-22 | 2006-05-17 | 武汉理工大学 | A Method of Precisely Controlling the Expansion of Steel Tube Concrete |
| CN101250035A (en) * | 2008-03-21 | 2008-08-27 | 西安建筑科技大学 | Expansion agent for cement or concrete and preparation method thereof |
| CN101597149A (en) * | 2008-06-04 | 2009-12-09 | 俞金波 | Swelling agent |
| CN101774777A (en) * | 2010-01-26 | 2010-07-14 | 江苏博特新材料有限公司 | Preparation method of calcium oxide expansion agents |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112110707A (en) * | 2019-06-20 | 2020-12-22 | 武汉三源特种建材有限责任公司 | Hydration regulation and control type expansion clinker and preparation thereof |
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