CN104108903A - Corn straw fiber enhanced fly ash polymer gel material and preparation method thereof - Google Patents
Corn straw fiber enhanced fly ash polymer gel material and preparation method thereof Download PDFInfo
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- CN104108903A CN104108903A CN201410274592.6A CN201410274592A CN104108903A CN 104108903 A CN104108903 A CN 104108903A CN 201410274592 A CN201410274592 A CN 201410274592A CN 104108903 A CN104108903 A CN 104108903A
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- alkali
- fly ash
- corn stalk
- activator
- flyash
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a corn straw fiber enhanced fly ash polymer gel material and a preparation method thereof. In the preparation method, the corn straws are mixed into an alkali-excited fly ash polymer gel material, and then the mixture is subjected to certain maintenance conditions so as to enable the material system to have good properties. The corn straw, namely a waste which has not been effectively utilized, is used to enhance a poly gel material prepared from an industrial waste fly ash. A novel way is provided for waste utilization, the environment burden is relieved, the energy consumption is reduced, and the material performances are strengthened. The corn straw fiber enhanced fly ash polymer gel material is an unfired and clinker-free material, is a zero-carbon-emission environment-friendly engineering material, is according with the social development trend, and has a good social benefit and economic benefit.
Description
Technical field
The invention belongs to civil construction material and manufacture field, relate to a kind of vegetable fibre and improve geopolymer gelled material.
Background technology
Cement is a kind of traditional gelling material, when making huge contribution for human economic development and social progress, due to its high resource, high energy gamma source consumption, high carbon emission and other serious environmental pollutions of causing, more and more do not meet the requirement of the current strategy of sustainable development, therefore, the current also green cementing material of Development of Novel in succession of various countries.Geopolymer (geopolymers) is the class Novel alkali excited cementing material that the people such as French scientist DavidovitsJ. found in late 1970s, it is to utilize the industrial residues (taking aluminosilicate as main component) such as clay, flyash, slag and slag to mix with alkaline silicate solution, the new inorganic polymer material of a class generating at 20～120 DEG C of forming and hardenings under highly basic excites.The composition of geopolymer and zeolites seemingly, but are non-crystalline state or semi-crystalline state in structure.Special structure makes geopolymer have the incomparable advantage of many traditional materials, as high-strength, the advantage such as strong, acid and alkali-resistance, hyposmosis, low contraction, low bulk, low heat conduction, high temperature resistant and good endurance early.Therefore, geopolymer has demonstrated huge application prospect at aspects such as green construction material, fixed sealing material, sealing material and heat-resistant fireproof materials.
But as cement, geopolymer also shows fragility, low tensile strength and easy to crack, these drawbacks limit the architectural design of geopolymer also have influence on the long-term durability of buildings.Steel fiber, carbon fiber and glass fibre strengthen the mushroom development of research of geopolymer and get up, but the corrosion of reinforcing bar is the major cause that affects long-term durability, and the price of these fibers is also relatively costly, increase the cost of geopolymer.Vegetable fibre is the natural macromolecular material that nature enriches the most, nearly hundred billion tons of the Mierocrystalline cellulose total amounts of the annual growth of occurring in nature.The advantages such as it is large that the fibre shape of vegetable fibre has length-to-diameter ratio, and specific tenacity is high, and specific surface area is large.Research and development vegetable fibre strengthens geopolymer based composites not only can reduce the cost of geopolymer, and can be conducive to environmental protection and Sustainable development.
Stalk fibre is the one of vegetable fibre, China's agricultural crop straw owning amount occupies first place in the world, the stalk gross annual output amount of all kinds of farm crop reaches more than 600,000,000 ton, stalk output accounts for 30% left and right of whole world stalk total amount, wherein 2.3 hundred million tons of straw, 2.2 hundred million tons of cornstalks, beans and autumn 1.0 hundred million tons of coarse cereals crop materials, 1.0 hundred million tons of peanut and potato class tendril, beet leavess etc.According to investigations, China's straw utilization rate is about 33% at present, in the annual a large amount of stalks produced in the whole nation, approximately 2/3 is fully utilized, to produce every year 600000000 tons of calculating of stalk, wherein about 0.28 hundred million ton for papermaking, 1.13 hundred million tons as feed, 1.08 hundred million tons of fields also, 3.5 hundred million tons as fuel or waste burning on the spot.Particularly, since the eighties in 20th century, in agriculture main producing region, along with crop yield prediction improves, stalk total amount increases sharply, and directly significantly reduces as the ratio of life fuel and feed.Some peasants have taked the simplest processing mode---and burn and pile and abandon everywhere, having caused topsoil, soil mineralization, fire failure, blocked the traffic, affect a large amount of society, economy and ecological problems such as look of a village, having caused country and social extensive concern.Obviously, such treatment process has become a kind of public hazards in many places.Therefore, the straw utilization mode that reform traditional falls behind, development straw circulating economy is imperative, how to solve the reasonable whereabouts of stalk, effectively utilizes problem to seem particularly urgent, in all parts of the country all in new way, the novel method of trying to explore straw circulating recycling.
Summary of the invention
Technical problem: the invention provides the maize straw that a kind of tensile strength is high, bend ductility is large and strengthen fly ash geopolymer gelled material, a kind of preparation method of this geopolymer gelled material is provided simultaneously.
Technical scheme: corn stalk fiber of the present invention strengthens fly ash geopolymer gelled material and prepares as follows:
First taking flyash as body material, adopt alkali-activator to excite flyash, prepare compound, described alkali-activator is that sodium hydroxide and liquid sodium silicate are formulated, and the modulus of alkali-activator is 1.5, the Na that alkali-activator is introduced
2the mass percent that O accounts for flyash is 10%;
Then in described flyash and alkali-activator compound, add the corn stalk fiber of having removed surperficial pectin, water ratio 5～10%, the mass percent that described corn stalk fiber accounts for compound is 1～3%.
Corn stalk fiber of the present invention strengthens in the preferred version of fly ash geopolymer gelled material, and corn stalk fiber is processed and obtained as follows:
Maize straw is put into drying in oven, after drying, room temperature is cut into the long section of 2～4cm, rap maize straw, surperficial pectin is removed, with 1%NaOH alkali lye, maize straw is carried out to dip treating again, 60～80 DEG C for the treatment of temps, then use distilled water flushing, finally in the baking oven of 80～90 DEG C of temperature, are dried to water ratio 5～10%.
Corn stalk fiber of the present invention strengthens in the preferred version of fly ash geopolymer gelled material, and the mass percent that corn stalk fiber accounts for compound is 2%.
Corn stalk fiber of the present invention strengthens in the preferred version of fly ash geopolymer gelled material, and the mass percent of the solid content of liquid sodium silicate is 37.63%, the Na that liquid sodium silicate contains mass percent 9.27%
2o, 29.4% SiO
2with 61.9% water.
The above-mentioned corn stalk fiber of preparation of the present invention strengthens the method for fly ash geopolymer gelled material, comprises the following steps:
First taking flyash as body material, adopt alkali-activator to excite flyash, prepare compound, the Na that alkali-activator is introduced
2the mass percent that O accounts for flyash is 10%;
Then in described flyash and alkali-activator compound, add the corn stalk fiber of having removed surperficial pectin, water ratio 5～10%, the mass percent that described corn stalk fiber accounts for compound is 1～3%.
Beneficial effect: the present invention compared with prior art, has the following advantages:
Corn stalk fiber is natural macromolecular material, and annual cellulose output is very large, can easily obtain.And corn stalk fiber preparation technology is simple, natural straw fiber only needs just can directly add in geopolymer and go through simple mechanical treatment and alkali lye infiltration.Than steel fiber, carbon fiber and polypropylene fibre, the price of stalk fibre is lower, and price comparison is in table 1.The price of stalk fibre is relatively cheap as can be seen from the table, and this provides possibility for reducing the cost of fibre-reinforced flyash geopolymer gelled material.
Table 1 fiber priced catalogue (unit/t)
| Kind | Steel fiber | Polypropylene fibre | Carbon fiber | Stalk |
| Price | 5000～10000 | 10000～20000 | 8000 | 1000～2000 |
The inner microscopic checks existing in various degree of geopolymer gelled material, this split tensile strength, bend ductility impact on material is very large.When adding uniformly in material after stalk fibre, the existence of fiber can reduce the formation of microscopic checks, and hinders the development of microscopic checks, has improved the subsurface defect of material.In the time that material is subject to external force, fiber and matrix acting in conjunction, thereby tensile strength, the bend ductility of raising material.
It is a kind of novel green gelling material that can place of cement that corn stalk fiber of the present invention strengthens fly ash geopolymer gelled material.The corn stalk fiber being prepared by aforesaid method strengthens fly ash geopolymer gelled material, and the feature of giving full play to vegetable fibre is improved the performance of geopolymer.Compared with plain fly ash geopolymer gelled material, the compression strength value of corn stalk fiber fly ash geopolymer gelled material and plain geopolymer gelled material are about the same, and tensile splitting strength, bend ductility have raising in various degree.
Embodiment
The present invention, taking flyash as body material, adopts alkali-activator to excite flyash, then adds stalk fibre and under certain curing condition, makes this material system have good performance.Wherein alkali-activator is that sodium hydroxide and liquid sodium silicate are formulated, and both proportionings are 1.5 to determine according to the modulus of alkali-activator.The quantity relative ratio relationship of flyash and alkali-activator is: the Na being introduced by alkali-activator
2the mass percent that O accounts for flyash is 10%.Corn stalk fiber is for having removed surperficial pectin in addition, water ratio 5～10%, and accounting for fly ash alkali-excited dose of mixture quality percentage ratio is 1～3%.
The preparation method that maize straw of the present invention strengthens geopolymer gelled material carries out according to the following steps:
A. corn stalk fiber is put into drying in oven, after room temperature is dried, be cut into the long section of 2～4cm, rap fiber the pectin of fiber surface is removed.With 1%NaOH alkali lye, fiber is carried out to dip treating again, 60～80 DEG C for the treatment of temps, then use distilled water flushing, finally in the baking oven of 80～90 DEG C of temperature, are dried to water ratio approximately 5～10%, pack sealing bag into and save backup.
B. sodium hydroxide and liquid sodium silicate are mixed, controlling its modulus is 1.5, makes alkali-activator for subsequent use.
Alkali-activator is mixed in flyash to the Na being introduced by alkali-activator
2the mass percent that O accounts for flyash is 10%; The corn stalk fiber of preservation is mixed above in compound, the mass percent that fiber accounts for compound is 1～3% again, and 2% is better.
Below in conjunction with embodiment, technical scheme of the present invention is described in further detail.
The raw material powder coal ash of 4 embodiment of the present invention goes from certain power plant, specific surface area 379m
2/ kg, its main component is in table 2.Maize straw is taken from certain rural area.The solid content 37.63% of liquid sodium silicate, contains 9.27%Na
2o, 29.4%SiO
2with 61.9% water; Sodium hydroxide is the NaOH chemical reagent containing 98.6%.
Table 2 chemical composition of PCA
| Chemical composition | SiO 2 | Al 2O 3 | Fe 2O 3 | MgO | CaO | SO 3 | K 2O | Na 2O | Loss on ignition | Total amount |
| wt.％ | 41.00 | 20.00 | 9.50 | 6.00 | 13.50 | 3.50 | 0.60 | 1.40 | 3.40 | 98.90 |
Embodiment 1
A. sodium hydroxide and liquid sodium silicate are mixed, control its modulus M (SiO
2)/n (Na
2o) be 1.5, make alkali-activator, for subsequent use after ageing 24h.
B. alkali-activator is mixed in flyash to the Na being introduced by alkali-activator
2the mass percent that O accounts for flyash is 10%, for exciting flyash; Hierarchy of control water cement ratio 0.4, obtains sample.
C. by room temperature maintenance 28d of sample, obtain plain fly ash geopolymer gelled material.
Embodiment 2
A. corn stalk fiber is put into drying in oven, after room temperature is dried, be cut into the long section of 2～4cm, rap fiber the pectin of fiber surface is removed.With 1%NaOH alkali lye, fiber is carried out to dip treating again, 60～80 DEG C for the treatment of temps, then use distilled water flushing, finally in the baking oven of 80～90 DEG C of temperature, are dried to water ratio approximately 5～10%, pack sealing bag into and save backup.
B. sodium hydroxide and liquid sodium silicate are mixed, controlling its modulus is 1.5, makes alkali-activator, for subsequent use after ageing 24h.
C. alkali-activator is mixed in flyash to the Na being introduced by alkali-activator
2the mass percent that O accounts for flyash is 10%, for exciting flyash; Hierarchy of control water cement ratio 0.4; The corn stalk fiber of preservation is mixed above in compound, the mass percent that fiber accounts for compound is 1%, obtains sample again.
D. by room temperature maintenance 28d of sample, obtain 1% volume corn stalk fiber fly ash geopolymer gelled material.
Embodiment 3 all the other conditions and step are all identical with embodiment 2, and difference is that the massfraction that fiber in step c accounts for compound is 2%.
Embodiment 4 all the other conditions and step are all identical with embodiment 2, and difference is that the massfraction that fiber in step c accounts for compound is 3%.
The fundamental property of the geopolymer gelled material of being prepared by above-mentioned 4 embodiment is in table 3.
From above-described embodiment, compared with plain fly ash geopolymer gelled material, though slightly reducing tensile splitting strength and bend ductility, the unconfined compression strength of the different maize straw flyash geopolymer gelled material of volume has raising in various degree.The tensile splitting strength and the bend ductility that mix 2% corn stalk fiber fly ash geopolymer gelled material strengthen maximum, and the tensile splitting strength and the bend ductility that increase material along with maize straw volume reduce.
The description of above-described embodiment is can understand and apply the invention for the ease of those skilled in the art.Those of ordinary skill in the art obviously can easily make various amendments to these embodiment, and General Principle described herein are applied in other embodiment and needn't pass through creative work.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not departing from improvement and the amendment that category of the present invention makes all should be within protection domain of the present invention.
Claims (5)
1. corn stalk fiber strengthens a fly ash geopolymer gelled material, it is characterized in that, this gelling material prepares as follows:
First taking flyash as body material, adopt alkali-activator to excite flyash, prepare compound, described alkali-activator is that sodium hydroxide and liquid sodium silicate are formulated, and the modulus of alkali-activator is 1.5, the Na that alkali-activator is introduced
2the mass percent that O accounts for flyash is 10%;
Then in described flyash and alkali-activator compound, add the corn stalk fiber of having removed surperficial pectin, water ratio 5 ~ 10%, the mass percent that described corn stalk fiber accounts for compound is 1 ~ 3%.
2. corn stalk fiber according to claim 1 strengthens fly ash geopolymer gelled material, it is characterized in that, described corn stalk fiber is processed and obtained as follows:
Maize straw is put into drying in oven, after drying, room temperature is cut into the long section of 2 ~ 4cm, rap maize straw, surperficial pectin is removed, with 1%NaOH alkali lye, maize straw is carried out to dip treating again, 60 ~ 80 DEG C for the treatment of temps, then use distilled water flushing, finally in the baking oven of 80 ~ 90 DEG C of temperature, are dried to water ratio 5 ~ 10%.
3. corn stalk fiber according to claim 1 and 2 strengthens fly ash geopolymer gelled material, it is characterized in that, the mass percent that described corn stalk fiber accounts for compound is 2%.
4. corn stalk fiber according to claim 1 and 2 strengthens fly ash geopolymer gelled material, it is characterized in that, the mass percent of the solid content of described liquid sodium silicate is 37.63%, the Na that liquid sodium silicate contains mass percent 9.27%
2o, 29.4% SiO
2with 61.9% water.
5. prepare the method that corn stalk fiber described in claim 1,2,3 or 4 strengthens fly ash geopolymer gelled material, it is characterized in that, the method comprises the following steps:
First taking flyash as body material, adopt alkali-activator to excite flyash, prepare compound, the Na that alkali-activator is introduced
2the mass percent that O accounts for flyash is 10%;
Then in described flyash and alkali-activator compound, add the corn stalk fiber of having removed surperficial pectin, water ratio 5 ~ 10%, the mass percent that described corn stalk fiber accounts for compound is 1 ~ 3%.
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Cited By (12)
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| CN104649646A (en) * | 2015-02-27 | 2015-05-27 | 赵广清 | Plastic composite material |
| CN106116294A (en) * | 2016-06-26 | 2016-11-16 | 周荣 | A kind of preparation method of energy-saving heat-insulating composite construction material |
| CN106746825A (en) * | 2016-11-24 | 2017-05-31 | 哈尔滨理工大学 | String enhancing alkali--activated slag cement and preparation method thereof |
| CN107500585A (en) * | 2017-09-22 | 2017-12-22 | 中国矿业大学 | Wheat straw fibre strengthens gangue geopolymer and preparation method |
| CN108046840A (en) * | 2017-12-14 | 2018-05-18 | 江苏德智重工有限公司 | A kind of enhanced foam concrete of rice straw and preparation method thereof |
| CN108892431A (en) * | 2018-08-31 | 2018-11-27 | 江苏金贸科技发展有限公司 | A kind of geopolymer/straw base NEW TYPE OF COMPOSITE building materials |
| CN110723954A (en) * | 2019-11-21 | 2020-01-24 | 湖南易兴建筑有限公司 | Fiber ceramic composite material and preparation method thereof |
| CN112726941A (en) * | 2020-12-29 | 2021-04-30 | 兰州理工大学 | Double-grid shear wall for fabricated building, manufacturing method and construction method |
| CN113105170A (en) * | 2021-04-15 | 2021-07-13 | 山东农业大学 | 3D printing alkali-activated geopolymer composite material doped with kenaf bast fiber crop straw and preparation method thereof |
| WO2021217784A1 (en) * | 2020-04-30 | 2021-11-04 | 南京钜力智能制造技术研究院有限公司 | Fly ash solid waste fiber unfired ceramsite and manufacturing method therefor |
| CN114538890A (en) * | 2021-12-31 | 2022-05-27 | 中国建筑科学研究院有限公司 | Method for producing degradable building blocks by using industrial and agricultural wastes |
| CN117602893A (en) * | 2024-01-24 | 2024-02-27 | 南京工业大学 | High-strength high-durability biomass non-calcium cement, preparation and use methods thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104649646A (en) * | 2015-02-27 | 2015-05-27 | 赵广清 | Plastic composite material |
| CN104649646B (en) * | 2015-02-27 | 2016-08-17 | 赵广清 | A kind of plasticity composite |
| CN106116294A (en) * | 2016-06-26 | 2016-11-16 | 周荣 | A kind of preparation method of energy-saving heat-insulating composite construction material |
| CN106746825A (en) * | 2016-11-24 | 2017-05-31 | 哈尔滨理工大学 | String enhancing alkali--activated slag cement and preparation method thereof |
| CN107500585A (en) * | 2017-09-22 | 2017-12-22 | 中国矿业大学 | Wheat straw fibre strengthens gangue geopolymer and preparation method |
| CN108046840A (en) * | 2017-12-14 | 2018-05-18 | 江苏德智重工有限公司 | A kind of enhanced foam concrete of rice straw and preparation method thereof |
| CN108892431A (en) * | 2018-08-31 | 2018-11-27 | 江苏金贸科技发展有限公司 | A kind of geopolymer/straw base NEW TYPE OF COMPOSITE building materials |
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| WO2021217784A1 (en) * | 2020-04-30 | 2021-11-04 | 南京钜力智能制造技术研究院有限公司 | Fly ash solid waste fiber unfired ceramsite and manufacturing method therefor |
| CN112726941A (en) * | 2020-12-29 | 2021-04-30 | 兰州理工大学 | Double-grid shear wall for fabricated building, manufacturing method and construction method |
| CN113105170A (en) * | 2021-04-15 | 2021-07-13 | 山东农业大学 | 3D printing alkali-activated geopolymer composite material doped with kenaf bast fiber crop straw and preparation method thereof |
| CN114538890A (en) * | 2021-12-31 | 2022-05-27 | 中国建筑科学研究院有限公司 | Method for producing degradable building blocks by using industrial and agricultural wastes |
| CN117602893A (en) * | 2024-01-24 | 2024-02-27 | 南京工业大学 | High-strength high-durability biomass non-calcium cement, preparation and use methods thereof |
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Application publication date: 20141022 |