CN104386960A - Method for recycling sodium silicate activated fly ash concrete - Google Patents
Method for recycling sodium silicate activated fly ash concrete Download PDFInfo
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- CN104386960A CN104386960A CN201410583212.7A CN201410583212A CN104386960A CN 104386960 A CN104386960 A CN 104386960A CN 201410583212 A CN201410583212 A CN 201410583212A CN 104386960 A CN104386960 A CN 104386960A
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- flyash
- concrete
- stone
- sand
- water glass
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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 relates to a method for recycling sodium silicate activated fly ash concrete. The method comprises the following steps of: firstly carrying out mixture calculation to obtain the proportion of coarse aggregates and fine aggregates having chemical components which are similar to chemical components of fly ash except ignition loss and moisture; then uniformly mixing the aggregates at the proportion and alkali activator sodium silicate together to prepare alkali activated cementing material concrete; after the service of the concrete is finished, calcining the concrete at 1450-1500 DEG C, and carrying out water quenching to obtain an active cementing material again so as to realize the recycling of useful components contained in the fly ash, the coarse aggregates and the fine aggregates. The method disclosed by the invention realizes the recycling of the alkali activated concrete; the limestone resources can be saved; and outstanding economical performance and operability are achieved.
Description
Technical field
The invention belongs to construction refuse resource and utilize field, particularly a kind of concrete proportioning that designs in advance is again by the method for secondary clacining recycle water glass alkali-activated carbonatite flyash concrete.
Background technology
Alkali-activated carbonatite gelling material is a kind of sial base hydraulicity gelling material, produces gelling property by alkali-activated carbonatite process.Alkali-activated carbonatite gelling material is raw material with solid waste, and having no side effect to environment, is one of the most potential green cementing material.And the production of traditional silicate cement is owing to taking Wingdale as main raw material calcination of cement clinker, there is the series of problems such as environmental pollution, ecological damage, energy dissipation, resource exhaustion.Therefore alkali-activated carbonatite gelling material is a kind of equivalent material of desirable traditional portland.But the concrete prepared by alkali-activated carbonatite gelling material is after its End Of Service, still can produce a large amount of building wastes, become " metabolite " that hinder urban construction.Therefore, the recycle of alkali-activated carbonatite cementitious material concrete affects its through engineering approaches to apply a factor.
Summary of the invention
Under such background, this technology, by the concrete batching stage, adjusts the ratio of sand, stone and flyash, finally requires in gained concrete overall chemical composition except loss on ignition and moisture, similar to granulated blast-furnace slag composition or close.After this concrete destruction, it calcined at 1450-1550 DEG C, shrend cools, and products therefrom is has certain active gelling material, thus achieves the recycling that water glass excites flyash concrete.The present invention has energy-conserving and environment-protective, and it is convenient to control, and is convenient to the feature of industrial applications.
To achieve these goals, the technical solution used in the present invention is:
Water glass excites flyash concrete circulation utilization method, comprising:
Step one, measure the chemical composition of the reinforcement of concrete fine aggregate, coarse aggregate and flyash, and by charge calculation, when being not counted in moisture and loss on ignition, make (CaO+MgO) in thick, fine aggregate and flyash three kinds of solid mixtures: (SiO
2+ Al
2o
3) be greater than 1 and be less than 1.5, determine the mass ratio of concrete coarse aggregate, fine aggregate and flyash;
Step 2, meets thick, fine aggregate and the fine-ground fly-ash of chemical constitution in step one, adds appropriate water and alkali-activated carbonatite cementitious material concrete prepared by water reducer with alkali-activator water glass after jointly mixing;
Step 3, after this concrete terminates under arms, it is broken, grinding is the powder that particle diameter is less than 80 microns, be placed on calcining also cooling fast at 1450 DEG C-1500 DEG C in calciner again, material after calcining passes through below fragmentation, grinding to 80 micron again, new gelling material can be obtained, the useful component in flyash and thick, fine aggregate thus reused.
Described fine aggregate is sand, and particle diameter is less than 5mm; Described coarse aggregate is stone, and particle diameter is greater than 5mm.
If the mass ratio of stone and sand is greater than 2.0, then the fragmentation of part stone is become Machine-made Sand, to guarantee that coarse aggregate and fine aggregate mass ratio are between 1.5-2.0.
Present technology provides a kind of method that water glass can be used to excite flyash concrete building waste secondary production gelling material.Use this technology to achieve recycling that water glass excites flyash concrete, can save natural resource.Meanwhile, above-mentioned technique is at Concrete, and discarded concrete is broken, grinding, and the aspects such as secondary clacining are all proven technique, have significant economy and operability.
Accompanying drawing explanation
Fig. 1 is that the present invention tests proportioning raw material position view residing in five yuan of phasors.
Embodiment
Embodiments of the present invention are described in detail below in conjunction with drawings and Examples.
Water glass of the present invention excites flyash concrete circulation utilization method, first the chemical composition of concrete batching sand used (i.e. fine aggregate), stone (i.e. coarse aggregate) and flyash is measured, under regular situation, its composition (mass percent) index is as follows:
The loss on ignition of sand: 1-2%, the SiO of the CaO of 2-5%, 60-80%
2, the Al of 10-15%
2o
3, the Fe of 2-4%
2o
3, the R of the MgO of 0-2%, 1-6%
2o, and surplus impurity;
The loss on ignition of stone: 20-35%, the SiO of the CaO of 30-40%, 10-20%
2, the Al of 1-3%
2o
3, the Fe of 0-2%
2o
3, the R of the MgO of 2-18%, 0-1.5%
2o, and surplus impurity;
The loss on ignition of flyash: 1-5%, the SiO of the CaO of 1-10%, 38-56%
2, the Al of 23-38%
2o
3, the Fe of 2-6%
2o
3, the R of the MgO of 0.5-4%, 0-2%
2o, and surplus impurity.
In the present embodiment, concrete Selection parameter is shown in Table 1, and according to the chemical composition in table 1, the proportioning calculated between stone, sand, flyash is 3.6:0.4:1.Under this proportioning, remove its chemical composition outside moisture and loss on ignition in concrete and all fall into Fig. 1 square frame position.In Fig. 1, A represents slag chemical composition, and B represents test sample composition.Can find out, this composition is close with granulated blast-furnace slag composition, and by melting, shrend can obtain certain active gelling material.
Table 1 concrete material chemical composition (mass percent)
| Raw material | Loss on ignition | CaO | SiO 2 | Al 2O 3 | Fe 2O 3 | MgO | R 2O | Impurity | Add up to |
| Stone | 29.68 | 36.87 | 16.17 | 2.34 | 0.696 | 12.56 | 0.827 | Surplus | 100％ |
| Sand | 1.4 | 2.61 | 73.99 | 12.44 | 2.54 | 0.62 | 5.3 | Surplus | 100％ |
| Flyash | 4.49 | 1.53 | 54.95 | 27.60 | 2.80 | 0.82 | 2.2 | Surplus | 100％ |
Because the content of the coarse aggregate stone in above-mentioned raw materials ratio is compared higher than concrete mix current at present.Wherein part stone can be broken into particle diameter and be less than the fine aggregate of 5mm and natural sand jointly as fine aggregate concrete batching.
1m
3in concrete, flyash is 430kg, 670kg fine aggregate (wherein 172kg sand, the Machine-made Sand that 498kg stone is broken), 1050kg coarse aggregate stone, water glass as alkali-activator mixes according to 5% of flyash quality, i.e. 21.5kg, adds polycarboxylate water-reducer 4.3kg simultaneously, water 215kg.
Because example is checking property experiment, simultaneously concrete component along with time variations little, to subsequent experimental without substantial influence, therefore without the need to by concrete pouring to ten year even many decades.The 15L concrete using this proportioning to prepare after natural curing to 2 month, through fragmentation, grinding to fineness more than 400m
2mixed again after/kg, then therefrom taken out about 1000g fine powder 2 parts respectively.Two parts of fine powders put into crucible, and in retort furnace, 1470 DEG C of calcinings were taken out after 1 hour.Material in crucible after taking-up melts completely.Material naturally cooling in a dry pot, the molten materials in another crucible is poured in previously prepd, the metal bucket of water filled fast, makes its shrend.Shrend products obtained therefrom is can the silicates gelling material of second stage employ.
Material after shrend is taken 450g add 5% water glass and 1350g standard sand make mortar specimen, measure the anti-folding of its 28d and reach 5.5MPa, ultimate compression strength 35.8MPa.
Claims (7)
1. water glass excites flyash concrete circulation utilization method, it is characterized in that, comprising:
Step one, measure the chemical composition of the reinforcement of concrete fine aggregate, coarse aggregate and alkali-activated carbonatite flyash used, and by charge calculation, when being not counted in moisture and loss on ignition, make (CaO+MgO) in thick, fine aggregate and flyash three kinds of solid mixtures: (SiO
2+ Al
2o
3) be greater than 1 and be less than 1.5, determine the mass ratio of concrete coarse aggregate, fine aggregate and flyash;
Step 2, meets thick, fine aggregate and the flyash of chemical constitution in step one, prepares alkali-activated carbonatite cementitious material concrete with alkali-activator water glass after jointly mixing;
Step 3, after this concrete terminates under arms, it is broken, grinding is the powder that particle diameter is less than 80 microns, be placed on calcining also cooling fast at 1450 DEG C-1500 DEG C in calciner again, material after calcining passes through below fragmentation, grinding to 80 micron again, new gelling material can be obtained, the useful component in flyash and thick, fine aggregate thus reused.
2. water glass according to claim 1 excites flyash concrete circulation utilization method, it is characterized in that, described fine aggregate is sand, and particle diameter is less than 5mm; Described coarse aggregate is stone, and particle diameter is greater than 5mm.
3. water glass according to claim 2 excites flyash concrete circulation utilization method, it is characterized in that, if the mass ratio of stone and sand is greater than 2.0, then the fragmentation of part stone is become Machine-made Sand, to guarantee that coarse aggregate and fine aggregate mass ratio are between 1.5-2.0.
4. water glass according to claim 2 excites flyash concrete circulation utilization method, it is characterized in that, the chemical composition (mass percent) of described sand, stone and flyash is as follows:
The loss on ignition of sand: 1-2%, the SiO of the CaO of 2-5%, 60-80%
2, the Al of 10-15%
2o
3, the Fe of 2-4%
2o
3, the R of the MgO of 0-2%, 1-6%
2o, and surplus impurity;
The loss on ignition of stone: 20-35%, the SiO of the CaO of 30-40%, 10-20%
2, the Al of 1-3%
2o
3, the Fe of 0-2%
2o
3, the R of the MgO of 2-18%, 0-1.5%
2o, and surplus impurity;
The loss on ignition of flyash: 1-5%, the SiO of the CaO of 1-10%, 38-56%
2, the Al of 23-38%
2o
3, the Fe of 2-6%
2o
3, the R of the MgO of 0.5-4%, 0-2%
2o, and surplus impurity.
5. water glass according to claim 2 excites flyash concrete circulation utilization method, it is characterized in that, the chemical composition (mass percent) of described sand, stone and flyash is as follows:
Sand: the loss on ignition of 1.4%, the CaO of 2.61%, the SiO of 73.99%
2, the Al of 12.44%
2o
3, the Fe of 2.54%
2o
3, the MgO of 0.62%, the R of 5.3%
2o, and surplus impurity;
Stone: the loss on ignition of 29.68%, the CaO of 36.87%, the SiO of 16.17%
2, the Al of 2.34%
2o
3, the Fe of 0.696%
2o
3, the MgO of 12.56%, the R of 0.827%
2o, and surplus impurity;
Flyash: the loss on ignition of 4.49%, the CaO of 1.53%, the SiO of 54.95%
2, the Al of 27.60%
2o
3, the Fe of 2.80%
2o
3, the MgO of 0.82%, the R of 2.2%
2o, and surplus impurity.
6. the water glass according to claim 2 or 5 excites flyash concrete circulation utilization method, it is characterized in that, the quality proportioning of described stone, sand and flyash is 3.6:0.4:1.
7. the water glass according to claim 2 or 5 excites flyash concrete circulation utilization method, it is characterized in that, also adds water and water reducer when preparing alkali-activated carbonatite cementitious material concrete after mixing in described step 2.
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|---|---|---|---|
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|---|---|---|---|
| CN201410583212.7A CN104386960B (en) | 2014-10-27 | 2014-10-27 | Water glass excites flyash concrete circulation utilization method |
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| CN104386960B CN104386960B (en) | 2016-04-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108840617A (en) * | 2018-08-30 | 2018-11-20 | 梁钟瑞 | Utilize the nano inorganic stone slab and its production method of flyash |
| CN109053045A (en) * | 2018-08-30 | 2018-12-21 | 广州大学 | A kind of alkali-activated carbonatite fly-ash slag piezoelectricity floor tile and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102060485A (en) * | 2010-12-02 | 2011-05-18 | 济南大学 | Cement concrete, and preparation method and recycling method thereof |
| CN102303036A (en) * | 2011-07-06 | 2012-01-04 | 东江环保股份有限公司 | Alkali activated solidification and stabilization treatment method of refuse incineration fly ash |
-
2014
- 2014-10-27 CN CN201410583212.7A patent/CN104386960B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102060485A (en) * | 2010-12-02 | 2011-05-18 | 济南大学 | Cement concrete, and preparation method and recycling method thereof |
| CN102303036A (en) * | 2011-07-06 | 2012-01-04 | 东江环保股份有限公司 | Alkali activated solidification and stabilization treatment method of refuse incineration fly ash |
Non-Patent Citations (3)
| Title |
|---|
| 中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会: "建设用卵石、碎石", 《中华人民共和国国家标准》 * |
| 中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会: "建设用砂", 《中华人民共和国国家标准》 * |
| 侯云芬等: "影响粉煤灰基矿物聚合物混凝土性能的因素", 《粉煤灰综合利用》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108840617A (en) * | 2018-08-30 | 2018-11-20 | 梁钟瑞 | Utilize the nano inorganic stone slab and its production method of flyash |
| CN109053045A (en) * | 2018-08-30 | 2018-12-21 | 广州大学 | A kind of alkali-activated carbonatite fly-ash slag piezoelectricity floor tile and preparation method thereof |
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|---|---|
| CN104386960B (en) | 2016-04-27 |
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Application publication date: 20150304 Assignee: Xi'an Jianke Baolong New Material Co.,Ltd. Assignor: XIAN University OF ARCHITECTURE AND TECHNOLOG Contract record no.: X2020980009912 Denomination of invention: Recycling method of fly ash concrete excited by sodium silicate Granted publication date: 20160427 License type: Common License Record date: 20201224 |
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Assignee: Xi'an Jianke Baolong New Material Co.,Ltd. Assignor: XIAN University OF ARCHITECTURE AND TECHNOLOG Contract record no.: X2020980009912 Date of cancellation: 20220506 |
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Granted publication date: 20160427 Termination date: 20211027 |