CN103553380A - Cement containing large volume of fly ash and preparation method thereof - Google Patents
Cement containing large volume of fly ash and preparation method thereof Download PDFInfo
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- CN103553380A CN103553380A CN201310477026.0A CN201310477026A CN103553380A CN 103553380 A CN103553380 A CN 103553380A CN 201310477026 A CN201310477026 A CN 201310477026A CN 103553380 A CN103553380 A CN 103553380A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention provides a cement containing large volume of fly ash. The cement includes 30-70 wt% of fly ash, 0.01-10 wt% of nano boehmite and the balance of Portland cement. Nano boehmite has small particles, excellent chemical and mechanical properties and good surface activity, and can be filled into the gaps among cement particles to enhance the forces among cement particles; and the nano boehmite can react with a cement clinker and fly ash to generate hydration products and promote the early hydration of cement, thereby improving the early strength of cement, increasing the addition of fly ash and reducing the cost.
Description
Technical field
The present invention relates to large volume cement field, particularly large-doping-amount fly ash cement and preparation method thereof.
Background technology
Cement is a kind of important material of construction, is widely used in the Infrastructure buildings such as road, bridge, building.But, in cement production process, need to consume a large amount of cement clinkers, and the production of cement clinker can consume a large amount of natural data and bring serious environmental pollution.The use Portland clinker of trying one's best few, many industrial residues that utilizes are produced cement as far as possible, are problems with environment protection significance and economic worth.
Flyash is current quantity discharged and piles one of high-volume maximum industrial residue, but in China, its utilization ratio is less than 40%, and remaining flyash can only rely on big area to stack, and not only to environment, has also taken land resources.
In order to make full use of flyash, researchist has invented large-doping-amount fly ash cement, and wherein, the doping of flyash is higher than 40% of cement total mass.But because the activity of flyash is lower, along with the increase of its incorporation in cement, the early strength of cement significantly reduces, and has limited its range of application.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of large-doping-amount fly ash cement, and early strength is high.
The invention discloses a kind of large-doping-amount fly ash cement, comprise following component:
The flyash of 30～70wt%;
The nm boehmite of 0.01～10wt%;
Surplus is silicate cement.
Preferably, the D50 of described nm boehmite is less than 20nm.
Preferably, the D95 of described nm boehmite is less than 40nm.
Preferably, the nm boehmite that comprises 0.1～2.5wt%.
Preferably, the flyash that comprises 41～60wt%.
Preferably, described silicate cement is PI type silicate cement.
The preparation method who the invention discloses a kind of large-doping-amount fly ash cement, comprises the following steps:
Nm boehmite Uniform Doped, in flyash and silicate cement, is obtained to large-doping-amount fly ash cement.
Compared with prior art, large-doping-amount fly ash cement of the present invention, comprising: the flyash of 30～70wt%; The nm boehmite of 0.01～10wt%; Surplus is silicate cement.Nm boehmite particle is little, has excellent chemistry and mechanical property and good surfactivity, space that can filling concrete particle, the reactive force between refinforced cement particle; And nm boehmite can with silicate cement generation chemical reaction, generate hydrated product, promote to mix the cement early hydration after a large amount of flyash, the early strength that has therefore not only improved cement has also increased the addition of flyash, has reduced cost.
Accompanying drawing explanation
Fig. 1 is the SEM photo of the nm boehmite of embodiment 1 employing;
Fig. 2 is the XRD figure spectrum after embodiment 1 and comparative example 1 hydrated cementitious.
Embodiment
In order further to understand the present invention, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these are described is for further illustrating the features and advantages of the present invention, rather than limiting to the claimed invention.
The embodiment of the invention discloses a kind of large-doping-amount fly ash cement, comprise following component:
The flyash of 30～70wt%;
The nm boehmite of 0.01～10wt%;
Surplus is silicate cement.
The present invention be take nm boehmite as toughener, its not only can filling concrete particle space, make its structure finer and close, reactive force between refinforced cement particle, and can with cement clinker and flyash generation chemical reaction, generate hydrated product, promote the aquation process of cement, improve the early strength of cement.
The purity of described nm boehmite is preferably greater than 98%, and the D50 of described nm boehmite is preferably less than 20nm, and its D95 is preferably less than 40nm.The content of described nm boehmite is preferably 0.01～10wt%, more preferably 0.1～2.5wt%.The present invention is not particularly limited for the source of nm boehmite, commercially available prod.
In the present invention, described flyash is important doped raw material, and the doping of a large amount of flyash, has reduced production cost.The content of described flyash is 30～70wt%, is preferably 41～60wt%.
In the present invention, the silicate cement that also comprises surplus.The present invention is not particularly limited for the kind of described silicate cement, can be the PI type silicate cement of admixture mixing material not, can be also PII type silicate cement, is preferably PI type silicate cement.The present invention is not particularly limited for the source of silicate cement, commercially available prod.
The preparation method who the invention also discloses a kind of large-doping-amount fly ash cement, comprises the following steps:
Nm boehmite Uniform Doped, in flyash and silicate cement, is obtained to large-doping-amount fly ash cement.
The necessary Uniform Doped of described nm boehmite is in flyash and silicate cement, and the present invention is not particularly limited for concrete adulterating method.Described nm boehmite also can be mixed with flyash and silicate cement in use again, and preferred scheme is: be scattered in water nm boehmite is ultrasonic, the time of described ultrasonic dispersion is preferably 5～15 minutes; Then, by flyash and silicate cement and the dispersed aqueous solution that has nm boehmite, can use.
Large-doping-amount fly ash cement of the present invention, comprising: the flyash of 30～70wt%; The nm boehmite of 0.01～10wt%; Surplus is silicate cement.Nm boehmite particle is little, has excellent chemistry and mechanical property and good surfactivity, space that can filling concrete particle, the reactive force between refinforced cement particle; And nm boehmite can with silicate cement generation chemical reaction, generate hydrated product, promote to mix the cement early hydration after a large amount of flyash, the early strength that has therefore not only improved cement has also increased the addition of flyash, has reduced cost.In addition, the present invention utilizes the method for dopen Nano boehmite to increase the early strength of large-doping-amount fly ash cement, and technique is simple, for expanding the application of large-doping-amount fly ash cement, provides new approach.
In order further to understand the present invention, below in conjunction with embodiment, large-doping-amount fly ash cement provided by the invention and preparation method thereof is described, protection scope of the present invention is not limited by the following examples.
The nm boehmite that following examples are selected is that U.S. Sasol company produces.
Embodiment 1
The large-doping-amount fly ash cement of the present embodiment comprises 220.5 grams of PI type silicate cement cement clinkers (gypsum account for clinker quality 4%), 220.5 flyash and 9 grams of nm boehmite.The particle diameter of described nm boehmite is 10～50nm, and as shown in Figure 1, Fig. 1 is the SEM photo of the nm boehmite of embodiment 1 employing to concrete structure.
The large-doping-amount fly ash cement of embodiment 1 is made to cement mortar, to test its early strength.
By 9 grams of nm boehmite in water dispersed 10 minutes, ultrasonic power is 300w(DS-5510DTH type Ultrasonic Cleaners), then according to the preparation process of ortho-water earth rubber sand test specimen in China's current standards, prepare cement mortar test specimen, after test specimen is made, put into standard curing room (20 ± 1 ℃ of temperature, relative humidity >=95%) maintenance, form removal continue normal curing to setting the length of time after 1 day, can obtain cement mortar test specimen.The component of described cement mortar test specimen is as shown in table 1.
Table 1 cement mortar test specimen component
When maintenance is taken out cement specimen after testing the length of time, folding strength and ultimate compression strength while utilizing Intensity of Breaking Tester, pressure testing machine to test its 3 days, specific experiment data are as shown in table 2.
Table 2 cement mortar test specimen 3d intensity contrast
Comparative example 1
The large-doping-amount fly ash cement of this comparative example comprises 225 grams of PI type silicate cements and 225 flyash.
Preparation process according to ortho-water earth rubber sand test specimen in China's current standards is prepared cement mortar test specimen, after test specimen is made, put into standard curing room (20 ± 1 ℃ of temperature, relative humidity >=95%) maintenance, form removal continue normal curing to setting the length of time after 1 day, can obtain cement mortar test specimen.The component of described cement mortar test specimen is as shown in table 1.
By data in table 2, can be found out, nm boehmite can significantly improve resistance to compression and the folding strength of large-doping-amount fly ash cement, and wherein folding strength improves 27.6%, and ultimate compression strength improves 29.5%.
Therefore in large-doping-amount fly ash cement, adding a small amount of nm boehmite can significantly improve cement early strength.
Simultaneously as shown in Figure 2, Fig. 2 is the XRD figure spectrum after embodiment 1 and comparative example 1 hydrated cementitious to X-ray diffractogram, and wherein A is the XRD figure spectrum after the hydrated cementitious of embodiment 1, and B is the XRD figure spectrum after the hydrated cementitious of comparative example 1.Fig. 2 shows to have generated calcium aluminosilicate hydrate and more calcium hydroxide after embodiment 1 admixture nm boehmite, and the aquation that has promoted cement is described.
Embodiment 2
The large-doping-amount fly ash cement of the present embodiment comprises 218.25 grams of PI type silicate cements, 225 flyash and 6.75 grams of nm boehmite.The particle diameter of described nm boehmite is 10～50nm.
The large-doping-amount fly ash cement of embodiment 1 is made to cement mortar, to test its early strength.
By 11.25 grams of nm boehmite in water dispersed 10 minutes, ultrasonic power is 300w(DS-5510DTH type Ultrasonic Cleaners), then according to the preparation process of ortho-water earth rubber sand test specimen in China's current standards, prepare cement mortar test specimen, after test specimen is made, put into standard curing room (20 ± 1 ℃ of temperature, relative humidity >=95%) maintenance, form removal continue normal curing to setting the length of time after 1 day, can obtain cement mortar test specimen.The component of described cement mortar test specimen is as shown in table 1.
When maintenance is taken out cement specimen after testing the length of time, folding strength and ultimate compression strength while utilizing Intensity of Breaking Tester, pressure testing machine to test its 3 days, specific experiment data are as shown in table 2.
Embodiment 3
The large-doping-amount fly ash cement of the present embodiment comprises 213.75 grams of PI type silicate cements, 225 flyash and 11.25 grams of nm boehmite.The particle diameter of described nm boehmite is 10～50nm.
The large-doping-amount fly ash cement of embodiment 1 is made to cement mortar, to test its early strength.
By 11.25 grams of nm boehmite in water dispersed 10 minutes, ultrasonic power is 300w(DS-5510DTH type Ultrasonic Cleaners), then according to the preparation process of ortho-water earth rubber sand test specimen in China's current standards, prepare cement mortar test specimen, after test specimen is made, put into standard curing room (20 ± 1 ℃ of temperature, relative humidity >=95%) maintenance, form removal continue normal curing to setting the length of time after 1 day, can obtain cement mortar test specimen.The component of described cement mortar test specimen is as shown in table 1.
When maintenance is taken out cement specimen after testing the length of time, folding strength and ultimate compression strength while utilizing Intensity of Breaking Tester, pressure testing machine to test its 3 days, specific experiment data are as shown in table 2.
Embodiment 4
The large-doping-amount fly ash cement of the present embodiment comprises 202.5 grams of PII type silicate cements, 225 flyash and 22.5 grams of nm boehmite.The particle diameter of described nm boehmite is 10～50nm.
The large-doping-amount fly ash cement of embodiment 1 is made to cement mortar, to test its early strength.
By 11.25 grams of nm boehmite in water dispersed 10 minutes, ultrasonic power is 300w(DS-5510DTH type Ultrasonic Cleaners), then according to the preparation process of ortho-water earth rubber sand test specimen in China's current standards, prepare cement mortar test specimen, after test specimen is made, put into standard curing room (20 ± 1 ℃ of temperature, relative humidity >=95%) maintenance, form removal continue normal curing to setting the length of time after 1 day, can obtain cement mortar test specimen.The component of described cement mortar test specimen is as shown in table 1.
When maintenance is taken out cement specimen after testing the length of time, folding strength and ultimate compression strength while utilizing Intensity of Breaking Tester, pressure testing machine to test its 3 days, specific experiment data are as shown in table 2.
The explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a large-doping-amount fly ash cement, comprises following component:
The flyash of 30～70wt%;
The nm boehmite of 0.01～10wt%;
Surplus is silicate cement.
2. large-doping-amount fly ash cement according to claim 1, is characterized in that, the D50 of described nm boehmite is less than 20nm.
3. large-doping-amount fly ash cement according to claim 1, is characterized in that, the D95 of described nm boehmite is less than 40nm.
4. large-doping-amount fly ash cement according to claim 1, is characterized in that, comprises the nm boehmite of 0.1～2.5wt%.
5. large-doping-amount fly ash cement according to claim 1, is characterized in that, comprises the flyash of 41～60wt%.
6. large-doping-amount fly ash cement according to claim 1, is characterized in that, described silicate cement is PI type silicate cement.
7. a preparation method for large-doping-amount fly ash cement, comprises the following steps:
Nm boehmite Uniform Doped, in flyash and silicate cement, is obtained to large-doping-amount fly ash cement.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014169221A (en) * | 2013-02-14 | 2014-09-18 | Sasol North America Inc | Cement compositions containing nano-sized boehmite crystallites |
| CN104446047A (en) * | 2014-12-25 | 2015-03-25 | 河南理工大学 | Two-dimensional nanomaterial reinforced high-mixing-content fly ash cement and preparation method thereof |
| CN104478246A (en) * | 2014-12-25 | 2015-04-01 | 河南理工大学 | Nanomaterial enhanced high-volume fly ash cement and preparation method thereof |
| CN104891839A (en) * | 2015-05-08 | 2015-09-09 | 河南理工大学 | Modified high belite cement and method for improving early strength of high belite cement |
| EP2767522A3 (en) * | 2013-02-14 | 2017-03-08 | Sasol North America Inc. | Cement compositions and concrete containing nano sized boehmite crystallites |
| CN109867505A (en) * | 2019-04-16 | 2019-06-11 | 河南理工大学 | A kind of phase transformation gypsum material and preparation method thereof of nm boehmite enhancing |
| CN114149232A (en) * | 2021-12-21 | 2022-03-08 | 北京金港场道工程建设有限公司 | High-compactness cement-based material applied to airport pavement and preparation method thereof |
| CN115925353A (en) * | 2022-11-22 | 2023-04-07 | 山东高速工程建设集团有限公司 | Steel slag-based rock-soil curing agent and preparation method thereof |
| CN116023059A (en) * | 2022-12-12 | 2023-04-28 | 辰龙新材料科技发展(山东)有限公司 | Multistage hybrid fiber, cement-based repair material, preparation method and application thereof |
| US11685853B2 (en) * | 2020-01-28 | 2023-06-27 | Halliburton Energy Services, Inc. | Nanoparticle alumina as a cement accelerator and compressive strength enhancer |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014169221A (en) * | 2013-02-14 | 2014-09-18 | Sasol North America Inc | Cement compositions containing nano-sized boehmite crystallites |
| EP2767522A3 (en) * | 2013-02-14 | 2017-03-08 | Sasol North America Inc. | Cement compositions and concrete containing nano sized boehmite crystallites |
| CN104446047A (en) * | 2014-12-25 | 2015-03-25 | 河南理工大学 | Two-dimensional nanomaterial reinforced high-mixing-content fly ash cement and preparation method thereof |
| CN104478246A (en) * | 2014-12-25 | 2015-04-01 | 河南理工大学 | Nanomaterial enhanced high-volume fly ash cement and preparation method thereof |
| CN104891839A (en) * | 2015-05-08 | 2015-09-09 | 河南理工大学 | Modified high belite cement and method for improving early strength of high belite cement |
| CN104891839B (en) * | 2015-05-08 | 2017-07-21 | 河南理工大学 | Modified High-belite Cement and the method for improving High-belite Cement early strength |
| CN109867505A (en) * | 2019-04-16 | 2019-06-11 | 河南理工大学 | A kind of phase transformation gypsum material and preparation method thereof of nm boehmite enhancing |
| US11685853B2 (en) * | 2020-01-28 | 2023-06-27 | Halliburton Energy Services, Inc. | Nanoparticle alumina as a cement accelerator and compressive strength enhancer |
| CN114149232A (en) * | 2021-12-21 | 2022-03-08 | 北京金港场道工程建设有限公司 | High-compactness cement-based material applied to airport pavement and preparation method thereof |
| CN115925353A (en) * | 2022-11-22 | 2023-04-07 | 山东高速工程建设集团有限公司 | Steel slag-based rock-soil curing agent and preparation method thereof |
| CN116023059A (en) * | 2022-12-12 | 2023-04-28 | 辰龙新材料科技发展(山东)有限公司 | Multistage hybrid fiber, cement-based repair material, preparation method and application thereof |
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