CN104402256B - The NaOH alkali-activated slag concrete circulation utilization method of chemically based composition - Google Patents
The NaOH alkali-activated slag concrete circulation utilization method of chemically based composition Download PDFInfo
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- CN104402256B CN104402256B CN201410582975.XA CN201410582975A CN104402256B CN 104402256 B CN104402256 B CN 104402256B CN 201410582975 A CN201410582975 A CN 201410582975A CN 104402256 B CN104402256 B CN 104402256B
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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
Abstract
The NaOH alkali-activated slag concrete circulation utilization method of chemically based composition, first pass through burdening calculation to be removed the coarse aggregate close with slag chemical composition of chemical composition outside loss on ignition and moisture and fine aggregate proportioning, then the aggregate using this proportioning prepares alkali-activated carbonatite cementitious material concrete after jointly mixing with alkali-activator NaOH, by the time after concrete End Of Service, again it is calcined at 1,450 1500 DEG C, shrend, the most again obtain activated Binder Materials, it is achieved thereby that the recycling of sodium hydroxide alkali excited cementing material, present invention achieves the recycling of alkali-activated carbonatite concrete, limestone resource can be saved, there is significant economy and operability.
Description
Technical field
The invention belongs to building material field, the sodium hydroxide alkali particularly to a kind of chemically based composition swashs
Send out slag concrete circulation utilization method.
Background technology
Alkali-activated slag concrete is jointly to be mixed by the coarse-fine aggregates such as slag, alkali-activator, water and sandstone
After obtain the engineering material with some strength.This kind of material not only function admirable, 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 be with Appropriate application
Solid waste, but also there is significant economic society and environmental benefit.But alkali-activated slag coagulation
Soil its use terminate after as building waste not only land occupation, and welding.To alkali-activated carbonatite ore deposit
The recycling of dreg concrete building waste carries out benefiting our pursuits and this will be advanced materials engineering.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, it is an object of the invention to provide a kind of chemically based group
The NaOH alkali-activated slag concrete circulation utilization method become, joins by adjusting alkali-activated carbonatite Binder Materials
The concrete mix of system so that the chemical composition of its concrete entirety is identical with raw ingredients of cement or connects
Closely, after waiting until that this concrete End Of Service is removed, then being calcined as new Binder Materials, this technique can
So that the concrete debris of the alkali-activated carbonatite Binder Materials preparation after Chai Chuing obtains secondary and utilizes, there is work
Skill is simple, and energy-conserving and environment-protective are easy to control, it is simple to the feature of industrial applications
To achieve these goals, the technical solution used in the present invention is:
The NaOH alkali-activated slag concrete circulation utilization method of chemically based composition, including:
Step one, measures the chemical composition of slag used by concrete fine aggregate, coarse aggregate and alkali-activated carbonatite,
And by burdening calculation, in the case of being not counted in loss on ignition so that thick, fine aggregate and three kinds of solids of slag
(CaO+MgO) in compound: (SiO2+Al2O3) more than 1.5 and less than 2.4, determine concrete coarse aggregate,
Fine aggregate and the mass ratio of slag；
Step 2, meets thick, fine aggregate and the ground slag powder of chemical composition in step one, with alkali-activated carbonatite
Agent NaOH prepares alkali-activated carbonatite cementitious material concrete after jointly mixing；
Step 3, after this concrete terminates under arms, is crushed, grinding is that particle diameter is less than 80 microns
Powder, then be placed in calciner at 1450 DEG C-1500 DEG C calcining and quickly cool down, after calcining
Material again below broken, grinding to 80 micron, i.e. can get new Binder Materials, slag and thick
Useful component in 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 more than 5mm.
If stone is more than 2.0 with the mass ratio of sand, then part stone is broken into Machine-made Sand,
To guarantee that coarse aggregate and fine aggregate mass ratio are between 1.5-2.0.
After described step 2 mixes preparation be additionally added when preparing alkali-activated carbonatite cementitious material concrete water and
Water reducer.
The landfill general with traditional architecture refuse disposal or be used as compared with regeneration aggregate, present technology provides
A kind of alkali-activated carbonatite concrete construction rubbish of can reusing is as the method for raw material producing Binder Materials.
Use this technology to achieve the recycling of alkali-activated carbonatite concrete, limestone resource can be saved.Meanwhile,
Above-mentioned technique is at Concrete, and the aspects such as discarded concrete is broken, grinding, secondary clacining are all ripe
Technology, there is significant economy and operability.
Accompanying drawing explanation
Fig. 1 is that the present invention tests proportioning raw material location schematic diagram in five yuan of phasors.
Detailed description of the invention
Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings with embodiment.
The NaOH alkali-activated slag concrete circulation utilization method of the chemically based composition of the present invention, first
The chemistry measuring sand (i.e. fine aggregate), stone (i.e. coarse aggregate) and slag used by concrete batching becomes
Point, 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%2O3,
The Fe of 2-4%2O3, 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%2O3,
The Fe of 0-2%2O3, 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%2O3,
The Fe of 1-8%2O3, the R of the MgO of 1-8%, 0-2%2O, and surplus impurity.
In the present embodiment, specifically chosen parameter is shown in Table 1, and according to the chemical composition in table 1, calculates
Proportioning between stone, sand, slag is 3.3:0.7:1.Under this proportioning, concrete removes moisture and burns mistake
Outside amount, its chemical composition each falls within square frame position in Fig. 1, and in Fig. 1, A represents slag chemical composition, B generation
Table phosphorus slag chemical composition, C represents test specimen composition, and D represents portland cement clinker chemical composition.Permissible
Finding out, this composition is between Portland clinker and granulated blast-furnace slag, and by melted, shrend is permissible
Obtain the Binder Materials of certain activity.
Table 1 concrete material chemical composition (mass percent)
| Raw material | Loss on ignition | CaO | SiO2 | Al2O3 | Fe2O3 | MgO | R2O | 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% |
Owing to the ratio of the coarse aggregate stone in above-mentioned raw materials ratio and fine aggregate sand is mixed higher than the most current
Ratio 1.5-2.0 in solidifying soil match ratio.Wherein part stone can be broken into particle diameter less than 5mm fine aggregate with
Natural sand is collectively as fine aggregate concrete batching.
1m3In concrete slag be 430kg, 671kg fine aggregate (wherein 301kg is sand listed by table 1,
370kg is the Machine-made Sand that stone listed by table 1 crushes), 1049kg coarse aggregate stone, as alkali-activated carbonatite
The NaOH of agent is according to 5% incorporation of slag quality, i.e. 21.5kg, polycarboxylate water-reducer 4.3kg, water 215kg.
Because example is checking property experiment, the component of concrete changes not quite over time simultaneously, to follow-up
Experiment is without substantial influence, therefore without by concrete curing to ten year even many decades.This match ratio is used to join
The 15L concrete of system is after natural curing was to 2 months, and through broken, grinding to fineness is more than 400m2/kg
After be mixed uniformly again, take out about 1000g fine powder 2 parts the most respectively.Two parts of fine powders put into earthenware
In crucible, in Muffle furnace 1470 DEG C calcining 1 hour after take out.The material in crucible after taking-up is the most complete
Melt.In one dry pot, material cools down naturally, and the fused materials in another crucible is quickly poured into preparation in advance
In metal bucket good, water that is that fill so that it is shrend.Shrend products obtained therefrom be can secondary utilize silicate
Class Binder Materials.
NaOH and 1350g normal sand that material after shrend weighs 450g addition 5% make mortar examination
Part, measures the anti-folding of its 28d and reaches 6.8MPa, compression strength 37.6MPa.
Claims (2)
- The NaOH alkali-activated slag concrete circulation utilization method of the most chemically based composition, its feature exists In, including:Step one, measures the chemical composition of slag used by concrete fine aggregate, coarse aggregate and alkali-activated carbonatite, And by burdening calculation, in the case of being not counted in loss on ignition so that fine aggregate, coarse aggregate and three kinds of slag (CaO+MgO) in solid mixture: (SiO2+Al2O3) more than 1.5 and less than 1.74, determine concrete The mass ratio of fine aggregate, coarse aggregate and slag, described fine aggregate is sand, and particle diameter is less than 5mm；Institute Stating coarse aggregate is stone, and particle diameter is more than 5mm, is calculated in mass percent, described sand, stone and slag Chemical composition 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%2O3, The Fe of 2-4%2O3, 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%2O3, The Fe of 0-2%2O3, 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%2O3, The Fe of 1-8%2O3, the R of the MgO of 1-8%, 0-2%2O, and surplus impurity；Step 2, meets the fine aggregate of chemical composition, coarse aggregate and slag in step one, with alkali-activator NaOH prepares alkali-activated carbonatite cementitious material concrete after jointly mixing；Step 3, after this concrete terminates under arms, is crushed, grinding is that particle diameter is less than 80 microns Powder, then be placed in calciner at 1450 DEG C-1500 DEG C calcining and quickly cool down, after calcining Material again below broken, grinding to 80 micron, i.e. can get new Binder Materials, slag and thick Useful component in fine aggregate thus reused.
- The NaOH alkali-activated slag concrete of chemically based composition the most according to claim 1 follows Ring Application way, it is characterised in that if the mass ratio of stone and sand is more than 2.0, then by part Stone is broken into Machine-made Sand, to guarantee that coarse aggregate and fine aggregate mass ratio are between 1.5-2.0.
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| CN102060485B (en) * | 2010-12-02 | 2012-07-04 | 济南大学 | Cement concrete, and preparation method and recycling method thereof |
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| CN102795798B (en) * | 2012-07-18 | 2013-08-14 | 西安建筑科技大学 | Method for enhancing strength of sodium hydroxide excited slag cement by using sodium chloride |
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