CN105174766B - Method for reinforcing recycled concrete fine aggregate by using carbon dioxide - Google Patents
Method for reinforcing recycled concrete fine aggregate by using carbon dioxide Download PDFInfo
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- CN105174766B CN105174766B CN201510587289.6A CN201510587289A CN105174766B CN 105174766 B CN105174766 B CN 105174766B CN 201510587289 A CN201510587289 A CN 201510587289A CN 105174766 B CN105174766 B CN 105174766B
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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 discloses a method for reinforcing recycled concrete fine aggregate by using carbon dioxide, which comprises the following steps: (1) calcium hydroxide solution or calcium salt calcification treatment: spreading recycled fine aggregate prepared from construction waste on a tray, spraying a calcium hydroxide or calcium salt solution, and stirring uniformly; (2) CO2 curing: putting the recycled fine aggregate subjected to calcium hydroxide solution or calcium salt calcification treatment in a closed carbonization box, and carrying out carbonization curing until the surface is completely carbonized; and (3) recycled mortar preparation: preparing recycled mortar with the substitution rate of 100% by using the treated recycled fine aggregate. Compared with the unreinforced recycled aggregate, the crushing value of the recycled fine aggregate prepared by the method is lowered by nearly 45%, and the water absorptivity is lowered by nearly 53%. Compared with the recycled mortar prepared from the unreinforced recycled aggregate, the consistency of the recycled mortar prepared by the method is enhanced by 42% or so, the 7d strength of the mortar is enhanced by 15-26%, and the 28d strength can be enhanced by 17-24%.
Description
Technical field
The present invention relates to one kind utilizes CO2The method of intensive treatment regeneration concrete fine aggregate, belongs to building castoff again
Make profits and use and construction material production technical field.
Background technology
Discarded concrete is processed into into regeneration aggregate and not only solves problem of environmental pollution for the preparation of regeneration concrete,
Resource reutilization is also achieved, the waste of resource and the energy is reduced.But compared with natural aggregate, regeneration aggregate inside exists big
Amount microcrack, crush index value are high, water absorption rate is big, using service behaviour, the mechanical property of its recycled cement product for preparing
Also it is difficult to meet engine request with durability.Therefore, intensifying regenerating fine aggregate is circulated with improving regeneration mortar performance to concrete
Using significant with sustainable development.
To improve the performance deficiency of regeneration aggregate, numerous scholars improve regeneration aggregate surface texture, subtract using distinct methods
Few micro-crack or hole, such as utilize polymer solution, water glass solution, organosilicon moisture repellent, and acid soak to process regeneration
Aggregate.The effect of wherein acid solution ablution is limited but also can introduce acid ion, affects the pH value of attachment mortar；At polymer
Logos can effectively reduce the water absorption rate of Aggregate of recycled concrete, but limited to the raising of intensity；The multipair regeneration aggregate of the studies above
Level such as screens out regenerative micro powder particle with requiring, and this undoubtedly increased intensifying regenerating fine aggregate process complexity and into
This burden, also reduces the utilization rate of regeneration aggregate.
Additionally, being related to utilize CO at present2Carbonization treatment with the research report and patent of intensifying regenerating aggregate performance, but
These disclosed documents are using regeneration aggregate from discarded concrete test block, and age is shorter（Less than 12 months）, containing more
Carbonizable substance so that carbonizing and modifying works well.But the concrete in building removal rubbish is used for decades,
Regeneration aggregate prepared therefrom, carbonizable substance content is low, and existing document method is not simultaneously applied to it.
The content of the invention
In order to overcome the deficiencies in the prior art, the present invention to provide a kind of using carbon dioxide intensifying regenerating concrete
The method of fine aggregate, can be effectively improved regeneration aggregate with regeneration mortar performance.
For achieving the above object, the present invention is employed the following technical solutions：
A kind of method of utilization carbon dioxide intensifying regenerating concrete fine aggregate, comprises the following steps：
（1）Aqua calcis or calcium salt add Calcium treatment to process：Take the recycled fine aggregate prepared by building waste to be laid in
In pallet, calcium hydroxide or calcium salt soln are sprayed afterwards and is stirred；
（2）CO2Intensive treatment：Recycled fine aggregate Jing after aqua calcis or calcium salt add Calcium treatment is placed in into closed carbon
In changing case, carbonization treatment to surface carbonation is complete；
（3）The preparation of regeneration mortar：The regeneration mortar that Replacement rate is 100% is prepared using the recycled fine aggregate for processing.
Further, step（1）In, the effect for increasing Calcium treatment depends on the solubility of calcium salt, higher with Selective dissolution degree
Calcium salt, such as calcium chloride or calcium nitrate.
Further, step（1）In, recycled fine aggregate particle diameter is less than 4.75mm.
Further, step（1）In, it is contemplated that the solubility of calcium hydroxide is relatively low, defines aqua calcis parameter C, C
For calcium hydroxide material used amount with its process aggregate quality ratio, C values scope be 0.01mol/kg ~ 0.05mol/
kg。
Further, step（1）In, the solvent quality of calcium hydroxide or calcium salt soln is by regeneration aggregate during carbonization treatment
Moisture content determines that regeneration aggregate moisture control is 0.2% ~ 10%.
Further, step（2）In, temperature is controlled during carbonization treatment for 10 DEG C ~ 50 DEG C.
Further, step（2）In, relative humidity 20% ~ 75% during carbonization treatment.
Further, step（2）In, CO during carbonization treatment2Concentration 20% ~ 100%.
Further, step（2）Completely the method for inspection is middle surface carbonation：Tiling regeneration aggregate, sprays phenolphthalein reagent,
Sample carbonization surface nondiscolouring, sample part carbonization then reddens.
The present invention utilizes CO2The principle for processing intensifying regenerating aggregate is as follows：Concrete carbonization refers to the CO in air2Deng acid
Property gas react with the alkaline matter in concrete, cause concrete alkalescence decline and concrete in chemical composition change
Neutralisation course of reaction.Carbonizable substance is mainly calcium hydroxide or calcium salt and hydrated calcium silicate etc., by taking calcium hydroxide as an example, instead
Answer equation as follows.
（1）
（2）
The invention has the beneficial effects as follows：
Research shows, without the regeneration aggregate surface of intensive treatment a large amount of microcracks are contained, and causes regeneration aggregate porosity
Larger, water absorption rate is higher.Aqua calcis or calcium salt soln are processed in regeneration aggregate is improved in the Jing method of the present invention
During carbonizable substance content, Jing after carbonization treatment, the calcium carbonate of formation effectively fills micro-crack, and effectively reduces regeneration aggregate hole
Gap rate, and then reduce aggregate crush values, reduce aggregate water absorption rate.Additionally, the thin bone of regeneration obtained by construction waste crushing screening
Regenerative micro powder content may be up to 20% in material, and high powder content causes the mobility for regenerating mortar fresh paste relatively low, and according to this
After inventive method process, with changing, modulus of fineness is increased slightly the level of regeneration aggregate, so that regeneration mortar mobility
Improve nearly 38.5%.Meanwhile, the compression strength for regenerating mortar improves nearly 20%.
It is of the invention with existing patent and document report difference：（1）Existing patent and literature processing are discarded coagulations
Native test block, age is usually no more than 1 year, and containing carbonizable substances such as higher CH, and it is the mixed of waste and old building that we are processed
Solidifying soil, carbonizable substance is few.（2）Before carbonization, soaked using calcium solution is increased.
Specific embodiment
The present invention is further described with reference to specific embodiment, but protection scope of the present invention and is not only limited
In this.
Embodiment 1
The present embodiment is comprised the following steps：
（1）Ca(OH)2Solution process：Recycled fine aggregate is laid in pallet, spraying parameter C is 0.01 mol/kg
Ca(OH)2The aqueous solution simultaneously stirs, and controls its moisture content for 5%.
（2）CO2Intensive treatment：By Jing Ca (OH)2Recycled fine aggregate after aqueous solution process is placed in closed carbonization case, control
Temperature processed is 30 DEG C, relative humidity is 50%, CO2Concentration is 75%, and carbonization treatment to surface carbonation is complete.
（3）The preparation of regeneration mortar：The regeneration mortar that Replacement rate is 100% is prepared using the recycled fine aggregate for processing.
Reference standard GB/T25176-2010《Concrete and mortar recycled fine aggregate》And GB/T14684-2011《Build
Use sand》The key property of aggregate before and after carbonization treatment is investigated, as shown in table 1, as a result shows to add carbonization treatment after calcium effectively to subtract
The water absorption rate and crush values index of few regeneration concrete fine aggregate, powder content is significantly reduced, and regeneration ratio of water dosage is notable
Reduce, apparent density is slightly reduced.
Performances of Recycled Aggregate of Existing before and after the carbonization of table 1
| Title | Modulus of fineness | Water absorption rate/% | Crush index/% | Powder content/% | Apparent density/（kg/m3） | Regeneration ratio of water dosage |
| Untreated recycled fine aggregate | 2.8 | 4.10 | 18 | 14.17 | 2640 | 1.17 |
| Recycled fine aggregate after process | 3.0 | 2.35 | 11 | 9.14 | 2636 | 1.10 |
The Jing CO that the present embodiment is obtained2Aggregate of recycled concrete and the thin bone of undressed regeneration after intensive treatment
Material, respectively according to cement mortar rate 1：4, the ratio of mud 0. 7 makes mortar specimen；Using untreated recycled fine aggregate respectively according to sand-lime
Than for 1：4th, the ratio of mud is 0.75 preparation regeneration mortar.Test mortar fresh paste denseness and its 7d, 28d compression strength such as table 2
It is shown.As a result show, under the conditions of the identical ratio of mud, carbonization treatment can be effectively improved regeneration mortar mobility so as to meet work
Cheng Yingyong；Compared with undressed regeneration mortar under the conditions of with denseness, 7d compression strength improves about 15.1%, 28d pressure resistances
Degree improves nearly 18.1%.
Table 2 regenerates consistency of mortar and compression strength
| Title | The ratio of mud | Denseness/mm | 7d compression strength/Mpa | 28d compression strength/Mpa |
| Aggregate before processing regenerates mortar | 0.7 | 52 | 9.1 | 14.0 |
| Aggregate before processing regenerates mortar | 0.75 | 74 | 5.3 | 8.3 |
| Mortar is regenerated after aggregate process | 0.7 | 72 | 6.1 | 9.8 |
Embodiment 2
The present embodiment is comprised the following steps：
（1）Ca(OH)2Solution process：Recycled fine aggregate is laid in pallet, spraying parameter C is 0.05 mol/kg
Ca(OH)2The aqueous solution simultaneously stirs, and controls its moisture content for 0.2%.
（2）CO2Intensive treatment：By Jing Ca (OH)2Recycled fine aggregate after aqueous solution process is placed in closed carbonization case, control
Temperature processed is 10 DEG C, CO2Concentration is 100%, and carbonization treatment to surface carbonation is complete.
（3）The preparation of regeneration mortar：The regeneration mortar that Replacement rate is 100% is prepared using the recycled fine aggregate for processing.
As a result the water absorption rate and crush values index for adding carbonization treatment after calcium to be effectively reduced regeneration concrete fine aggregate is shown,
As shown in table 3.
Performances of Recycled Aggregate of Existing before and after the carbonization of table 3
| Title | Modulus of fineness | Water absorption rate/% | Crush index/% | Powder content/% | Apparent density/（kg/m3） | Regeneration ratio of water dosage |
| Untreated recycled fine aggregate | 2.4 | 2.19 | 11 | 22.00 | 2636 | 1.20 |
| Recycled fine aggregate after process | 2.5 | 1.77 | 9 | 19.84 | 2621 | 1.12 |
The Jing CO that the present embodiment is obtained2Aggregate of recycled concrete after intensive treatment is according to cement-sand ratio 1：4, the ratio of mud 0.
875 make mortar specimen；Using untreated Aggregate of recycled concrete according to cement-sand ratio be 1：4th, the ratio of mud is 0.870 preparation regeneration
Mortar.Test mortar fresh paste denseness and its 7d, 28d compression strength are as shown in table 4.As a result show, carbonization treatment can be effective
Improve regeneration mortar mobility so as to meet engineer applied；Meanwhile, the regeneration mortar 7d and 28d resistance to compression prepared by carbonization aggregate
Intensity is respectively increased about 26.36% and 23.84%.
Table 4 regenerates consistency of mortar and compression strength
| Title | The ratio of mud | Denseness/mm | 7d compression strength/Mpa | 28d compression strength/Mpa |
| Aggregate before processing regenerates mortar | 0.875 | 75 | 7.51 | 11.20 |
| Mortar is regenerated after aggregate process | 0.825 | 72 | 9.49 | 13.87 |
Embodiment 3
The present embodiment is comprised the following steps：
（1）Calcium chloride solution process：Recycled fine aggregate is laid in pallet, spraying parameter C is the chlorine of 0.01 mol/kg
Change the calcium aqueous solution and stir, control regeneration aggregate moisture content for 10%.
（2）CO2Intensive treatment：Recycled fine aggregate Jing after calcium chloride water process is placed in closed carbonization case, control
Temperature processed is 50 DEG C, relative humidity is 20%, CO2Concentration is 20%, and carbonization treatment to surface carbonation is complete.
（3）The preparation of regeneration mortar：The regeneration mortar that Replacement rate is 100% is prepared using the recycled fine aggregate for processing.Such as
Shown in table 5.
Performances of Recycled Aggregate of Existing before and after the carbonization of table 5
| Title | Modulus of fineness | Water absorption rate/% | Crush index/% | Powder content/% | Apparent density/（kg/m3） | Regeneration ratio of water dosage |
| Untreated recycled fine aggregate | 2.4 | 2.19 | 11 | 22.00 | 2636 | 1.20 |
| Recycled fine aggregate after process | 2.5 | 1.03 | 6 | 18.35 | 2632 | 1.15 |
The Jing CO that the present embodiment is obtained2Aggregate of recycled concrete after intensive treatment is according to cement-sand ratio 1：4, the ratio of mud 0.
875 make mortar specimen；Using untreated Aggregate of recycled concrete according to cement-sand ratio be 1：4th, the ratio of mud is 0.870 preparation regeneration
Mortar.Test mortar fresh paste denseness and its 7d, 28d compression strength are as shown in table 6.As a result show, carbonization treatment can be effective
Improve regeneration mortar mobility so as to meet engineer applied；Meanwhile, the regeneration mortar 7d and 28d resistance to compression prepared by carbonization aggregate
Intensity is respectively increased nearly 18.38% and 17.50%.
Table 6 regenerates consistency of mortar and compression strength
| Title | The ratio of mud | Denseness/mm | 7d compression strength/Mpa | 28d compression strength/Mpa |
| Aggregate before processing regenerates mortar | 0.875 | 75 | 7.51 | 11.20 |
| Mortar is regenerated after aggregate process | 0.825 | 74 | 8.89 | 13.16 |
Embodiment 4
The present embodiment is comprised the following steps：
（1）Ca(NO3)2Solution process：Recycled fine aggregate is laid in pallet, spraying parameter C is 0.01 mol/kg
Ca(NO3)2The aqueous solution simultaneously stirs, and controls its moisture content for 5%.
（2）CO2Intensive treatment：By Jing Ca (NO3)2Recycled fine aggregate after aqueous solution process is placed in closed carbonization case, control
Temperature processed is 30 DEG C, relative humidity is 50%, CO2Concentration is 75%, and carbonization treatment to surface carbonation is complete.
（3）The preparation of regeneration mortar：The regeneration mortar that Replacement rate is 100% is prepared using the recycled fine aggregate for processing.
Reference standard GB/T25176-2010《Concrete and mortar recycled fine aggregate》And GB/T14684-2011《Build
Use sand》The key property of aggregate before and after carbonization treatment is investigated, as shown in table 7, as a result shows to add carbonization treatment after calcium effectively to subtract
The water absorption rate and crush values index of few regeneration concrete fine aggregate, powder content is significantly reduced, and regeneration ratio of water dosage is notable
Reduce, apparent density is slightly reduced.
Performances of Recycled Aggregate of Existing before and after the carbonization of table 7.
| Title | Modulus of fineness | Water absorption rate/% | Crush index/% | Powder content/% | Apparent density/（kg/m3） | Regeneration ratio of water dosage |
| Untreated recycled fine aggregate | 2.4 | 2.19 | 11 | 22.00 | 2636 | 1.20 |
| Recycled fine aggregate after process | 2.55 | 1.53 | 5.42 | 19.45 | 2617 | 1.10 |
The Jing CO that the present embodiment is obtained2Aggregate of recycled concrete after intensive treatment is according to cement-sand ratio 1：4, the ratio of mud 0.
875 make mortar specimen；Using untreated Aggregate of recycled concrete according to cement-sand ratio be 1：4th, the ratio of mud is 0.825 preparation regeneration
Mortar.Test mortar fresh paste denseness and its 7d, 28d compression strength are as shown in table 8.As a result show, carbonization treatment can be effective
Improve regeneration mortar mobility so as to meet engineer applied；Meanwhile, the regeneration mortar 7d and 28d resistance to compression prepared by carbonization aggregate
Intensity is respectively increased nearly 13% and 22%.
Table 8 regenerates consistency of mortar and compression strength
| Title | The ratio of mud | Denseness/mm | 7d compression strength/Mpa | 28d compression strength/Mpa |
| Aggregate before processing regenerates mortar | 0.875 | 75 | 7.51 | 11.20 |
| Mortar is regenerated after aggregate process | 0.825 | 76 | 8.49 | 13.67 |
Comparative example
This comparative example is comprised the following steps：
（1）CO2Intensive treatment：By original state recycled fine aggregate（It is 5% to adjust moisture content）In being placed in closed carbonization case, control
Temperature is 30 DEG C, relative humidity is 50%, CO2Concentration is 75%, and carbonization treatment to surface carbonation is complete.
（2）The preparation of regeneration mortar：The regeneration mortar that Replacement rate is 100% is prepared using the recycled fine aggregate for processing.
Reference standard GB/T25176-2010《Concrete and mortar recycled fine aggregate》And GB/T14684-2011《Build
Use sand》The key property of aggregate before and after carbonization treatment is investigated, as shown in table 9, as a result shows the regeneration for not adding carbonization treatment after calcium
Concrete fine aggregate key property is without significant change.
Performances of Recycled Aggregate of Existing before and after the carbonization of table 9
| Title | Modulus of fineness | Water absorption rate/% | Crush index/% | Powder content/% | Apparent density/（kg/m3） | Regeneration ratio of water dosage |
| Untreated recycled fine aggregate | 2.4 | 2.19 | 11 | 22.00 | 2636 | 1.20 |
| Recycled fine aggregate after process | 2.4 | 2.10 | 11 | 21.32 | 2638 | 1.17 |
The Jing CO that this comparative example is obtained2Aggregate of recycled concrete after intensive treatment is according to cement-sand ratio 1：4, the ratio of mud
0.875 makes mortar specimen；Using untreated Aggregate of recycled concrete according to cement-sand ratio be 1：4th, the ratio of mud is prepared again for 0.870
Greensand is starched.Test mortar fresh paste denseness and its 7d, 28d compression strength are as shown in table 10.As a result show, without plus calcium and it is straight
Connect carbonization aggregate unobvious to improving regeneration mortar mobility and mechanical property effect, this also absolutely proves the weight that calcium source is processed
The property wanted and necessity.
Table 10 regenerates consistency of mortar and compression strength
| Title | The ratio of mud | Denseness/mm | 7d compression strength/Mpa | 28d compression strength/Mpa |
| Aggregate before processing regenerates mortar | 0.875 | 75 | 7.51 | 11.20 |
| Mortar is regenerated after aggregate process | 0.870 | 73 | 7.98 | 10.97 |
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of method of utilization carbon dioxide intensifying regenerating concrete fine aggregate, it is characterised in that：Comprise the following steps：
（1）Aqua calcis or calcium salt add Calcium treatment：Take the recycled fine aggregate prepared by building waste to be laid in pallet, after
Spray calcium hydroxide or calcium salt soln and stir；
Define calcium hydroxide or calcium salt soln parameter C, C is that the amount of calcium hydroxide used or calcium salt material processes the matter of aggregate with it
The ratio of amount, C values scope is 0.01mol/kg～0.05mol/kg；
The solvent quality of calcium hydroxide or calcium salt soln determines that regeneration aggregate is aqueous by the moisture content of regeneration aggregate during carbonization treatment
Rate is controlled 0.2%～10%；
（2）CO2Maintenance：Recycled fine aggregate Jing after aqua calcis or calcium salt add Calcium treatment is placed in closed carbonization case, carbon
Change maintenance complete to surface carbonation；
（3）The preparation of regeneration mortar：The regeneration mortar that Replacement rate is 100% is prepared using the recycled fine aggregate for processing.
2. as claimed in claim 1 using the method for carbon dioxide intensifying regenerating concrete fine aggregate, it is characterised in that：Step
（1）In, the calcium salt is calcium chloride or calcium nitrate.
3. as claimed in claim 1 using the method for carbon dioxide intensifying regenerating concrete fine aggregate, it is characterised in that：Step
（1）In, recycled fine aggregate particle diameter is less than 4.75mm.
4. as claimed in claim 1 using the method for carbon dioxide intensifying regenerating concrete fine aggregate, it is characterised in that：Step
（2）In, temperature is controlled during carbonization treatment for 10 DEG C～50 DEG C.
5. as claimed in claim 1 using the method for carbon dioxide intensifying regenerating concrete fine aggregate, it is characterised in that：Step
（2）In, relative humidity 20%～75% during carbonization treatment.
6. as claimed in claim 1 using the method for carbon dioxide intensifying regenerating concrete fine aggregate, it is characterised in that：Step
（2）In, CO during carbonization treatment2Concentration 20%～100%.
7. as claimed in claim 1 using the method for carbon dioxide intensifying regenerating concrete fine aggregate, it is characterised in that：Step
（2）Completely the method for inspection is middle surface carbonation：Tiling regeneration aggregate, sprays phenolphthalein reagent, and sample carbonization surface is constant
Color, sample part carbonization then reddens.
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