CN104402256A - Cyclic utilization method for sodium-hydroxide alkali activated slag concrete based on chemical composition - Google Patents
Cyclic utilization method for sodium-hydroxide alkali activated slag concrete based on chemical composition Download PDFInfo
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- CN104402256A CN104402256A CN201410582975.XA CN201410582975A CN104402256A CN 104402256 A CN104402256 A CN 104402256A CN 201410582975 A CN201410582975 A CN 201410582975A CN 104402256 A CN104402256 A CN 104402256A
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- China
- Prior art keywords
- slag
- concrete
- alkali
- activated
- stone
- 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.)
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 title claims abstract description 60
- 239000004567 concrete Substances 0.000 title claims abstract description 50
- 239000002893 slag Substances 0.000 title claims abstract description 43
- 239000003513 alkali Substances 0.000 title claims abstract description 31
- 239000000126 substance Substances 0.000 title claims abstract description 30
- 239000000203 mixture Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229940083608 sodium hydroxide Drugs 0.000 title abstract 4
- 235000011121 sodium hydroxide Nutrition 0.000 title abstract 4
- 125000004122 cyclic group Chemical group 0.000 title abstract 3
- 239000000463 material Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000001354 calcination Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000004364 calculation method Methods 0.000 claims abstract description 3
- 239000004576 sand Substances 0.000 claims description 20
- 239000004575 stone Substances 0.000 claims description 19
- 239000010430 carbonatite Substances 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 238000013467 fragmentation Methods 0.000 claims description 5
- 238000006062 fragmentation reaction Methods 0.000 claims description 5
- 239000012190 activator Substances 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 2
- 239000008247 solid mixture Substances 0.000 claims description 2
- 235000019738 Limestone Nutrition 0.000 abstract description 2
- 239000006028 limestone Substances 0.000 abstract description 2
- 230000003213 activating effect Effects 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract 1
- 239000011707 mineral Substances 0.000 abstract 1
- 235000010755 mineral Nutrition 0.000 abstract 1
- 238000010791 quenching Methods 0.000 abstract 1
- 230000000171 quenching effect Effects 0.000 abstract 1
- 239000002994 raw material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000010813 municipal solid waste Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical group [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000002742 anti-folding effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007734 materials engineering Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
A cyclic utilization method for sodium-hydroxide alkali activated slag concrete based on chemical composition is disclosed and comprises: firstly performing mixture calculation to obtain the proportions of crude aggregate and fine aggregate which possess chemical compositions similar to the chemical compositions of mineral slag after ignition loss and water are removed; then uniformly mixing the aggregates with the proportions with an alkali activating agent sodium hydroxide, so as to prepare an alkali-activated cementing material concrete; and after the concrete is used, calcining the concrete at 1450-1500 DEG C, and performing water quenching, so as to again obtain the active cementing material and realize cyclic utilization of the sodium-hydroxide alkali activated cementing material. The method realizes repeated utilization of alkali-activated concrete, is capable of saving limestone resource and has substantial economical efficiency and operability.
Description
Technical field
The invention belongs to building material field, particularly a kind of sodium hydroxide alkali-activated slag concrete circulation utilization method based on chemical constitution.
Background technology
Alkali-activated slag concrete is the engineering materials obtaining having some strength after jointly being mixed by the coarse-fine aggregates such as slag, alkali-activator, water and sandstone.This kind of material not only excellent property, adaptability is good, and resource consumption is little, and energy consumption is low, develops this cementitious material concrete and not only economizes on resources, can Appropriate application solid waste, but also has significant economic society and environmental benefit.But alkali-activated slag concrete its use terminate after as building waste not only land occupation, and welding.Benefiting our pursuits to the recycling of alkali-activated slag concrete construction rubbish to advance this materials engineering.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of sodium hydroxide alkali-activated slag concrete circulation utilization method based on chemical constitution, by the concrete mix of adjustment alkali-activated carbonatite gelling material preparation, make the chemical composition of its concrete entirety identical with raw ingredients of cement or close, by the time after this concrete End Of Service is removed, calcined as new gelling material again, this technique can make the concrete debris of the alkali-activated carbonatite gelling material preparation after removing obtain second stage employ, there is technique simple, energy-conserving and environment-protective, it is convenient to control, be convenient to the feature of industrial applications
To achieve these goals, the technical solution used in the present invention is:
Based on the sodium hydroxide alkali-activated slag concrete circulation utilization method of chemical constitution, comprising:
Step one, measure the chemical composition of the reinforcement of concrete fine aggregate, coarse aggregate and alkali-activated carbonatite slag used, and by charge calculation, when being not counted in loss on ignition, make (CaO+MgO) in thick, fine aggregate and slag three kinds of solid mixtures: (SiO
2+ Al
2o
3) be greater than 1.5 and be less than 2.4, determine the mass ratio of concrete coarse aggregate, fine aggregate and slag;
Step 2, meets thick, fine aggregate and the ground slag powder of chemical constitution in step one, prepares alkali-activated carbonatite cementitious material concrete with alkali-activator sodium hydroxide 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 slag and coarse-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.
Mix in described step 2 when alkali-activated carbonatite cementitious material concrete is prepared in rear preparation and also add water and water reducer.
The landfill general with traditional architecture disposal of garbage or be used as compared with regeneration aggregate, present technology provides and a kind ofly can reuse the method for alkali-activated carbonatite concrete construction rubbish as the raw material of production gelling material.Use this technology to achieve the concrete recycling of alkali-activated carbonatite, can limestone resource be saved.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.
The present invention is based on the sodium hydroxide alkali-activated slag concrete circulation utilization method of chemical constitution, first the chemical composition of concrete batching sand used (i.e. fine aggregate), stone (i.e. coarse aggregate) and slag 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 slag: 1-2%, the SiO of the CaO of 40-65%, 15-25%
2, the Al of 1-5%
2o
3, the Fe of 1-8%
2o
3, the R of the MgO of 1-8%, 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, slag is 3.3:0.7:1.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 phosphorus slag chemical composition, and C represents test sample composition, and D represents portland cement clinker chemical composition.Can find out, this composition is between Portland clinker and granulated blast-furnace slag, 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％ |
| Slag | 1.8 | 62.7 | 20.01 | 3.82 | 4 | 1.48 | 1.2 | Surplus | 100％ |
Because the ratio of the coarse aggregate stone in above-mentioned raw materials ratio and fine aggregate sand is higher than ratio 1.5-2.0 in 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, slag is 430kg, 671kg fine aggregate (wherein 301kg sand listed by table 1, the 370kg Machine-made Sand that stone is broken listed by table 1), 1049kg coarse aggregate stone, sodium hydroxide as alkali-activator mixes according to 5% of slag quality, i.e. 21.5kg, polycarboxylate water-reducer 4.3kg, 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% sodium hydroxide and 1350g standard sand make mortar specimen, measure the anti-folding of its 28d and reach 6.8MPa, ultimate compression strength 37.6MPa.
Claims (7)
1., based on the sodium hydroxide alkali-activated slag concrete circulation utilization method of chemical constitution, 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 slag used, and by charge calculation, when being not counted in loss on ignition, make (CaO+MgO) in thick, fine aggregate and slag three kinds of solid mixtures: (SiO
2+ Al
2o
3) be greater than 1.5 and be less than 2.4, determine the mass ratio of concrete coarse aggregate, fine aggregate and slag;
Step 2, meets thick, fine aggregate and the ground slag powder of chemical constitution in step one, prepares alkali-activated carbonatite cementitious material concrete with alkali-activator sodium hydroxide 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 slag and coarse-fine aggregate thus reused.
2. the sodium hydroxide alkali-activated slag concrete circulation utilization method based on chemical constitution according to claim 1, 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. the sodium hydroxide alkali-activated slag concrete circulation utilization method based on chemical constitution according to claim 2, 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. the sodium hydroxide alkali-activated slag concrete circulation utilization method based on chemical constitution according to claim 2, it is characterized in that, the chemical composition (mass percent) of described sand, stone and slag 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 slag: 1-2%, the SiO of the CaO of 40-65%, 15-25%
2, the Al of 1-5%
2o
3, the Fe of 1-8%
2o
3, the R of the MgO of 1-8%, 0-2%
2o, and surplus impurity.
5. the sodium hydroxide alkali-activated slag concrete circulation utilization method based on chemical constitution according to claim 2, it is characterized in that, the chemical composition (mass percent) of described sand, stone and slag 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;
Slag: the loss on ignition of 1.8%, the CaO of 62.7%, the SiO of 20.01%
2, the Al of 3.82%
2o
3, the Fe of 4%
2o
3, the MgO of 1.48%, the R of 1.2%
2o, and surplus impurity.
6. the sodium hydroxide alkali-activated slag concrete circulation utilization method based on chemical constitution according to claim 2 or 5, it is characterized in that, the quality proportioning of described stone, sand and slag is 3.3:0.7:1.
7. the sodium hydroxide alkali-activated slag concrete circulation utilization method based on chemical constitution according to claim 2 or 5, is characterized in that, also add water and water reducer when preparing alkali-activated carbonatite cementitious material concrete after mixing in described step 2.
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|---|---|---|---|
| CN201410582975.XA CN104402256B (en) | 2014-10-27 | 2014-10-27 | The NaOH alkali-activated slag concrete circulation utilization method of chemically based composition |
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|---|---|---|---|
| CN201410582975.XA CN104402256B (en) | 2014-10-27 | 2014-10-27 | The NaOH alkali-activated slag concrete circulation utilization method of chemically based composition |
Publications (2)
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|---|---|
| CN104402256A true CN104402256A (en) | 2015-03-11 |
| CN104402256B CN104402256B (en) | 2016-08-24 |
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Citations (5)
| 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 |
| EP2468695A1 (en) * | 2010-12-21 | 2012-06-27 | Mapei S.p.A. | Method for recycling concrete |
| CN102795798A (en) * | 2012-07-18 | 2012-11-28 | 西安建筑科技大学 | Method for enhancing strength of sodium hydroxide excited slag cement by using sodium chloride |
| CN103274658A (en) * | 2013-01-14 | 2013-09-04 | 虞克夫 | Industrial waste residue and solid danger refuse resource utilization method |
| CN103553395A (en) * | 2013-10-17 | 2014-02-05 | 北京新奥混凝土集团有限公司 | Recycled green concrete with low cement content and preparation method thereof |
-
2014
- 2014-10-27 CN CN201410582975.XA patent/CN104402256B/en not_active Expired - Fee Related
Patent Citations (5)
| 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 |
| EP2468695A1 (en) * | 2010-12-21 | 2012-06-27 | Mapei S.p.A. | Method for recycling concrete |
| CN102795798A (en) * | 2012-07-18 | 2012-11-28 | 西安建筑科技大学 | Method for enhancing strength of sodium hydroxide excited slag cement by using sodium chloride |
| CN103274658A (en) * | 2013-01-14 | 2013-09-04 | 虞克夫 | Industrial waste residue and solid danger refuse resource utilization method |
| CN103553395A (en) * | 2013-10-17 | 2014-02-05 | 北京新奥混凝土集团有限公司 | Recycled green concrete with low cement content and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| N KASHINO等: "《RILEM International Symposium on Environment-Conscious Materials and Systems for Sustainable Development》", 24 November 2004 * |
| 付亚伟等: "机场道面新型碱矿渣快速修复混凝土研究", 《新型建筑材料》 * |
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|---|---|
| CN104402256B (en) | 2016-08-24 |
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Granted publication date: 20160824 |