CN103601424A - Geopolymeric concrete based on recycled aggregate and preparation method of geopolymeric concrete - Google Patents
Geopolymeric concrete based on recycled aggregate and preparation method of geopolymeric concrete Download PDFInfo
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- 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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- 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
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Abstract
The invention relates to geopolymeric concrete based on recycled aggregate, and a preparation method of the geopolymeric concrete. The concrete is prepared by taking construction waste as aggregate and inorganic geopolymer as an adhesive through an alkali activation process. The recycled aggregate geopolymeric concrete prepared by using the method has the characteristics that the concrete can be rapidly dried, the compressive strength, particularly the early-stage compressive strength is high, the volume shrinkage in the coagulation process is extremely low, the coefficient of volume expansion is approximate to 0, and acid-base corrosion resistance is good. Due to the adoption of the method, the defects that the conventional concrete is low in early-stage strength and the coagulation time is long are overcome; a method for rapidly repairing concrete pavement is provided, and problems of recycling and reusing construction waste aggregate and environment problems caused by the construction waste aggregate are solved.
Description
Technical field
The present invention relates to concrete technology field, be specifically related to take building castoff as regeneration aggregate, concrete that geopolymer is binding agent and preparation method thereof.
Background technology
A large amount of early stage bridges and building are forced to remove owing to reaching maybe can not satisfy the demands working life, have produced thus a large amount of discarded concretes.In more than ten years in the past, for discarded concrete, regeneration re-uses and has carried out a large amount of research.Discarded aggregate is replaced to natural aggregate to be manufactured novel concrete and reaches and turn waste into wealth; the object of resources circulation recycling; thereby can effectively protect national resource; the consumption of minimizing to natural aggregate and the energy, effectively alleviates the environmental threat (problem such as resource bottleneck and environmental pollution) that we face today.Yet, utilization for discarded concrete is now confined to crushed stone aggregate part, and regeneration aggregate is purified or the production sequence of making needs to redesign, processing requirement more complicated is meticulous, consuming time and price is also more expensive, by a large amount of performance tests of novel concrete prepared by regeneration aggregate, it is found that in addition, the main difference of Aggregate of recycled concrete and natural aggregate is that the former often contains a large amount of additional mortar and cement slurry.In addition, owing to adopting in process of production the powerful broken method of machinery, regeneration aggregate the inside can produce a lot of cracks, causes reproducing the decline of crushed stone aggregate intensity and quality, thereby makes the reduction of strength of recycled aggregate concrete, Young's modulus and the weather resistance of new production.Generally, present stage regenerated aggregate concrete utilization also there is following significant problem:
(1) concrete crushing strength that prepared by regeneration concrete crushed stone aggregate only has 80 ~ 90% of common natural aggregate concrete crushing strength, and the Young's modulus of RAC is also on the low side;
(2) regeneration concrete crushed stone aggregate porosity is higher than natural rubble aggregate, and density is lower than natural rubble, thereby causes regenerated aggregate concrete and common natural aggregate concrete in intensity, water suction, freeze-thawing resistant,, in the performances such as contraction and creep, there is very large difference in impermeability;
(3) because Aggregate of recycled concrete crack is many, porosity is large, water-intake rate is higher, and the slump-loss of RAC is greater than normal concrete.Therefore want to reach the ultimate compression strength equally high with normal concrete, RAC need to be used more cement;
(4) RAC freezing and thawing performance is poor, and has higher shrinkage and creep.
According to above-mentioned several large problems, also have scholar to propose some solutions and technology:
(1) with additive, carry out the bounding force between refinforced cement and regenerated coarse aggregate, increase the intensity of regenerated aggregate concrete.Kou etc. find that flyash can part place of cement, improve the workability of RAC, and special thin flyash can effectively be filled the microfracture of regeneration aggregate.
(2) by changing the Production Flow Chart of discarded concrete aggregate, loss of strength is dropped to minimum.The concrete recycle that Shima etc. have introduced a kind of advanced person utilizes technology: adopt machinery, high-temperature activation processing mode, effectively reject corner angle more fragile on particles of aggregates and the hardened mortar that sticks to rubble surface, improve aggregate performance, prepare high-quality Aggregate of recycled concrete.In this method, the concrete of disintegration is heated to 300 ℃ (high-temperature activations), makes to be attached on the Behavior of Hardened Cement Paste residue embrittlement on regeneration rubble in the process of thermal dehydration; Then the aggregate after heating is delivered in rotating cylinder and ground 3 minutes (mechanical activation), after discharging, after sieve classification, obtain high quality recycled aggregates.Katz has proposed two kinds of methods of improving reconstituted circularly metaling quality: the regeneration crushed stone aggregate after adopting the silica flour solution of 10wt.% or ultrasonic wave to fragmentation cleans, to remove its surperficial discrete particle.
Yet now the application of discarded concrete is still only confined to the recycling to coarse aggregate (stone) and fine aggregate (sand), and discarded concrete need to be transported to special factory to carry out fragmentation, screening and classification and obtains regeneration aggregate by special machinery equipment and technology, and program and technology be more complicated all.Moreover, association's regulation: in new concrete, regenerated coarse aggregate can not surpass 30%, recycled fine aggregate can not surpass 20%, this just means that the natural sand masonry still needing more than 50% is aggregate, just can produce the regeneration concrete meeting the demands, and the intensity of regeneration concrete and Young's modulus also lower than original old concrete.
Summary of the invention
The invention provides a kind of regeneration aggregate polymer concrete and preparation method thereof, to solve various shortcomings and deficiency in prior art.
The invention provides a kind of regeneration aggregate polymer concrete and preparation method thereof, it is characterized in that, it is high that concrete provided by the invention has ultimate compression strength, and shrinking percentage is low, and RAC freezing and thawing performance is good, the corrosion of ability bronsted lowry acids and bases bronsted lowry, and also cost is lower than portland cement.
Described regeneration aggregate geopolymer concrete, is characterized in that feed composition is discarded concrete after fragmentation, sand, binding agent raw material, exciting agent, additive etc.;
Described regeneration aggregate geopolymer concrete, is characterized in that discarded concrete aggregate comprises the fine aggregates such as rubble coarse aggregate and waste water plaster;
Described regeneration aggregate geopolymer concrete, is characterized in that binding agent raw material is one or more mixtures of metakaolin, flyash and blast-furnace slag;
Described regeneration aggregate geopolymer concrete, is characterized in that exciting agent is the mixture that one or more and water glass in sodium hydroxide, potassium hydroxide, lime, sodium carbonate are made into;
The preparation method of described regeneration aggregate geopolymer concrete, is characterized in that comprising following processing step:
1) be 40%～70% discarded concrete (wherein coarse aggregate content is not less than 60%, and fine aggregate content is not higher than 40%) by volume and to be that additive that 20%～40% fine sand (medium sand) and volume are 0%～5% is uniformly mixed into solid mixture in mould stand-by for volume;
2) water glass that is 0.1%～1.5% by volume and volume are that 1%～15% alkali (one or more mixtures in sodium hydroxide, potassium hydroxide, lime, sodium carbonate) is made into exciting agent solution for later use with water;
3) by the mixture of metakaolin, flyash and blast-furnace slag or wherein a kind ofly take volume and mix with exciting agent solution as 10%～30%, stir 5～20min, mix with solid mixture, stir 10min～30min, normal temperature maintenance forms.
The regeneration aggregate geopolymer concrete being prepared from, time of coagulation is short, and normal temperature lower time of coagulation is 10～60min; Have higher early anti pressured intension, 4h ultimate compression strength in the length of time is greater than 10Mpa, and 1d ultimate compression strength in the length of time is greater than 15 Mpa, and 3d ultimate compression strength in the length of time is greater than 40Mpa; 7d ultimate compression strength in the length of time is greater than 80Mpa; 14d ultimate compression strength in the length of time is greater than 80Mpa.In time of coagulation, shrinking percentage is low, is less than 0.05%; Water-intake rate is low, is less than 3%; Acid resistance, 10% sulphuric acid soln, every day, mass loss was less than 0.01%.
Proportioning in present patent application is mass percent.
With discarded aggregate, replace natural rubble aggregate to prepare concrete, can reach turn waste into wealth, the object of resource circulation utilization, thereby both can reduce the consumption to natural aggregate and the energy, can effectively alleviate again the environmental problem that the stacking because of discarded concrete brings.And for the utilization of discarded concrete, be only confined to crushed stone aggregate part now, and in shattering process, aggregate produces the concrete performances of impact such as corner angle, crackle, so consumption is also restricted.So first need to prepare a kind of efficient geology polymeric binder.The three-dimensional network gelinite with non-crystalline state and quasi-crystalline state feature being polymerized with silicon-oxy tetrahedron and aluminum-oxygen tetrahedron that the natural mineral that geopolymer employing contains abundant silicon and aluminium or industrial solid castoff etc. (kaolinite or metakaolin, flyash, blast-furnace slag, volcanic ash, rice husk ash etc.) are prepared under the exciting of basic solution.There is excellent thermostability, chemical stability and bonding strength.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The present invention aims to provide a kind ofly take construction waste composition granule as skeletal grain, geopolymer is new concrete that is base material such as binding agent and preparation method thereof, this regeneration aggregate geopolymer concrete has that quick-drying, ultimate compression strength improve that ultimate compression strength is high especially in early days, in condensing process extremely low, the volume coefficient of volumetric shrinkage approach 0, the feature of acid-alkali-corrosive-resisting.The method has overcome the shortcoming that conventional concrete early strength is low, time of coagulation is long, and the method on a kind of quick rehabilitating concrete road surface is provided, and has solved the regeneration problem of building castoff aggregate, and the environmental problem causing thus.
Invention provides a kind of regeneration aggregate geopolymer coagulation, by building castoff aggregate (comprising coarse aggregate and fine aggregate), one or more of kaolin, flyash or blast-furnace slag are raw material, one or more mixtures of sodium hydroxide, potassium hydroxide, sodium carbonate of take are exciting agent, add a small amount of water glass simultaneously, through mixing casting, form.Solid content is that a kind of or mixture of waste aggregate, fine sand and metakaolin or flyash or blast-furnace slag forms, and wherein aggregate consumption is 40%～70% discarded concrete (wherein coarse aggregate content is not less than 60%, and fine aggregate content is not higher than 40%); Fine sand (medium sand) consumption is 20%～40%; The mixture of metakaolin, flyash and blast-furnace slag or wherein a kind of consumption are 10%～30%.The relative metakaolin of other additive amount, flyash and blast-furnace slag consumption and determine, wherein water glass consumption is 0.1%～1.5%; Alkali (one or more mixtures in sodium hydroxide, potassium hydroxide, lime, sodium carbonate) consumption is 1%～15%.
The preparation method who the present invention is based on regeneration aggregate geopolymer concrete comprises following processing step:
1) be 40%～70% discarded concrete (wherein coarse aggregate content is not less than 60%, and fine aggregate content is not higher than 40%) by volume and to be that additive that 20%～40% fine sand (medium sand) and volume are 0%～5% is uniformly mixed into solid mixture in mould stand-by for volume;
2) water glass that is 0.1%～1.5% by volume and volume are that 1%～15% alkali (one or more mixtures in sodium hydroxide, potassium hydroxide, lime, sodium carbonate) is made into exciting agent solution for later use with water;
3) by the mixture of metakaolin, flyash and blast-furnace slag or wherein a kind ofly take volume and mix with exciting agent solution as 10%～30%, stir 5～20min, mix with solid mixture, stir 10min～30min, normal temperature maintenance forms.
The regeneration aggregate geopolymer concrete being prepared from, time of coagulation is short, and normal temperature lower time of coagulation is 10～60min; Have higher early anti pressured intension, 4h ultimate compression strength in the length of time is greater than 10Mpa, and 1d ultimate compression strength in the length of time is greater than 15 Mpa, and 3d ultimate compression strength in the length of time is greater than 40Mpa; 7d ultimate compression strength in the length of time is greater than 80Mpa; 14d ultimate compression strength in the length of time is greater than 80Mpa.In time of coagulation, shrinking percentage is low, is less than 0.05%; Water-intake rate is low, is less than 3%; Acid resistance, 10% sulphuric acid soln, every day, mass loss was less than 0.01%.
Example 1:
Step 1, concrete debris is carried out to classification, take coarse aggregate (diameter is at 30～60mm) 300g～600g, fine aggregate (discarded concrete ash) 200g～400g, fine sand 200g～400g evenly mixes stand-by;
Step 2, take 1g～3g water glass, 10g～30 sodium hydroxide mixes, and adds water 200ml and is made into exciting agent solution for later use;
Step 3, take metakaolin (kaolin through 600 ℃, 650 ℃, 700 ℃, 750 ℃, 800 ℃ calcining 2～5h form) 150g～300g;
Step 4, metakaolin is added in exciting agent solution, stir 5～20min, then mix with aggregate mixture, add water 1000ml simultaneously, stir 10min～30min, mold, normal temperature maintenance forms.Accompanying drawing 1 is the scanning electron microscope (SEM) photograph of concrete surface that this experiment obtains.
Example 2:
Step 1, concrete debris is carried out to classification, take coarse aggregate (diameter is at 30～60mm) 300g～600g, fine aggregate (discarded concrete ash) 200g～400g, fine sand 200g～400g evenly mixes stand-by;
Step 2, take 1g～3g water glass, 10g～30 sodium hydroxide mixes, and adds water 200ml and is made into exciting agent solution for later use;
Step 3, take flyash 200g～500g;
Step 4, flyash is added in exciting agent solution, stir 5～20min, then mix with aggregate mixture, add water 1000ml simultaneously, stir 10min～30min, mold, normal temperature maintenance forms.Accompanying drawing 2 is the scanning electron microscope (SEM) photograph of concrete surface that this experiment obtains.
Example 3:
Step 1, concrete debris is carried out to classification, take coarse aggregate (diameter is at 30～60mm) 300g～600 g, fine aggregate (discarded concrete ash) 200g～400g, fine sand 200g～400g evenly mixes stand-by;
Step 2, take 1g ~ 3g water glass, 15g ~ 35 potassium hydroxide mixes, and adds water 200ml and is made into exciting agent solution for later use;
Step 3, take flyash 100g ~ 250g, take metakaolin 100 g ~ 250g, mix;
Step 4, flyash and kaolin mixture are added in exciting agent solution, stir 5～20min, then mix with aggregate mixture, add water 1000ml simultaneously, stir 10min～30min, mold, normal temperature maintenance forms.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: the technical scheme that its in specification sheets still can be recorded aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement, does not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (3)
1. the invention provides a kind of regeneration aggregate polymer concrete and preparation method thereof, it is characterized in that take that building castoff is as aggregate, one or more mixtures of metakaolin, flyash and blast-furnace slag of take are binding agent, and by alkali excitation process, normal temperature maintenance forms.
2. as described in right, the invention provides a kind of regeneration aggregate polymer concrete, to have ultimate compression strength high, and shrinking percentage is low, and RAC freezing and thawing performance is good, the corrosion of ability bronsted lowry acids and bases bronsted lowry, and also cost is lower than portland cement.
3. the regeneration aggregate geopolymer concrete as described in right 1, is characterized in that feed composition is discarded concrete after fragmentation, sand, binding agent raw material, exciting agent, additive etc.
4. the regeneration aggregate geopolymer concrete as described in right 1, is characterized in that discarded concrete aggregate comprises the fine aggregates such as rubble coarse aggregate and waste water plaster.
5. the regeneration aggregate geopolymer concrete as described in right 1, is characterized in that binding agent raw material is one or more mixtures of metakaolin, flyash and blast-furnace slag.
6. the regeneration aggregate geopolymer concrete as described in right 1, is characterized in that exciting agent is the mixture that one or more and water glass in sodium hydroxide, potassium hydroxide, lime, sodium carbonate are made into.
7. the preparation method of the regeneration aggregate geopolymer concrete as described in right 1, is characterized in that comprising following processing step:
1) be 40%～70% discarded concrete (wherein coarse aggregate content is not less than 60%, and fine aggregate content is not higher than 40%) by volume and to be that additive that 20%～40% fine sand (medium sand) and volume are 0%～5% is uniformly mixed into solid mixture in mould stand-by for volume;
2) water glass that is 0.1%～1.5% by volume and volume are that 1%～15% alkali (one or more mixtures in sodium hydroxide, potassium hydroxide, lime, sodium carbonate) is made into exciting agent solution for later use with water;
3) by the mixture of metakaolin, flyash and blast-furnace slag or wherein a kind ofly take volume and mix with exciting agent solution as 10%～30%, stir 5～20min, mix with solid mixture, stir 10min～30min, normal temperature maintenance forms.
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