CN105174766A - 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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- CN105174766A CN105174766A CN201510587289.6A CN201510587289A CN105174766A CN 105174766 A CN105174766 A CN 105174766A CN 201510587289 A CN201510587289 A CN 201510587289A CN 105174766 A CN105174766 A CN 105174766A
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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 and utilize CO
2the method of intensive treatment regeneration concrete fine aggregate, belongs to building castoff regeneration and material of construction production technical field.
Background technology
Discarded concrete is processed into the preparation that regeneration aggregate is used for regeneration concrete and not only solves problem of environmental pollution, also achieve resource reutilization, decrease the waste of resource and the energy.But compared with natural aggregate, regeneration aggregate inside exists that a large amount of microcrack, crush index value are high, water-intake rate large, the serviceability of the recycled cement goods utilizing it to prepare, mechanical property and weather resistance are also difficult to engineering demands.Therefore, intensifying regenerating fine aggregate with improve regeneration mortar performance, to concrete recycle and Sustainable development significant.
For improving the performance deficiency of regeneration aggregate, numerous scholar utilizes different methods to improve regeneration aggregate surface tissue, reduces tiny crack or hole, as utilized polymers soln, water glass solution, organosilicon moisture repellent, and acid soak process regeneration aggregate.Wherein acid solution washing out method limited use but also can acid ion be introduced, impact attachment mortar pH value; Polymer treatment method can effectively reduce the water-intake rate of Aggregate of recycled concrete, but limited to the raising of intensity; The multipair regeneration aggregate level of above-mentioned research is furnished with requirement, and as screened out regenerative micro powder particle, and this adds process complexity and the cost burden of intensifying regenerating fine aggregate undoubtedly, also reduces the utilization ratio of regeneration aggregate.
In addition, existing about utilizing CO at present
2carbonizing treatment is with the research report of intensifying regenerating aggregate performance and patent, but document disclosed in these adopts regeneration aggregate from discarded concrete test block, in the length of time shorter (being no more than 12 months), containing more carbonizable substance, make carbonizing and modifying respond well.But the concrete in building removal rubbish employs decades, regeneration aggregate prepared therefrom, carbonizable substance content is low, and existing literature method is inapplicable to it.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of method utilizing carbonic acid gas intensifying regenerating concrete fine aggregate, effectively can improve regeneration aggregate and regeneration mortar performance.
For achieving the above object, the present invention is by the following technical solutions:
Utilize a method for carbonic acid gas intensifying regenerating concrete fine aggregate, comprise the following steps:
(1) aqua calcis or calcium salt add Calcium treatment process: get the recycled fine aggregate prepared by building waste and be laid in pallet, and rear sprinkling calcium hydroxide or calcium salt soln also stir;
(2) CO
2intensive treatment: be placed in airtight carbonization case by adding the recycled fine aggregate after Calcium treatment through aqua calcis or calcium salt, carbonizing treatment is complete to surface carbonation;
(3) preparation of mortar is regenerated: utilize the recycled fine aggregate processed to prepare the regeneration mortar that Replacement rate is 100%.
Further, in step (1), the effect increasing Calcium treatment depends on the solubleness of calcium salt, with the calcium salt that Selective dissolution degree is higher, as calcium chloride or nitrocalcite.
Further, in step (1), recycled fine aggregate particle diameter is less than 4.75mm.
Further, in step (1), consider that the solubleness of calcium hydroxide is lower, definition aqua calcis parameter C, C is the ratio of the quality of calcium hydroxide amount of substance used and its process aggregate, and C value scope is 0.01mol/kg ~ 0.05mol/kg.
Further, in step (1), the solvent quality of calcium hydroxide or calcium salt soln is determined by the water ratio of regeneration aggregate during carbonizing treatment, and regeneration aggregate moisture control is 0.2% ~ 10%.
Further, in step (2), during carbonizing treatment, control temperature is 10 DEG C ~ 50 DEG C.
Further, in step (2), relative humidity 20% ~ 75% during carbonizing treatment.
Further, in step (2), CO during carbonizing treatment
2concentration 20% ~ 100%.
Further, the middle surface carbonation of step (2) the completely method of inspection is: tiling regeneration aggregate, sprays phenolphthalein reagent, and sample carbonization surface nondiscoloration, sample part carbonization then reddens.
The present invention utilizes CO
2the principle of process intensifying regenerating aggregate is as follows: concrete carbonization refers to the CO in air
2react Deng the alkaline matter in sour gas and concrete, cause the neutralisation reaction process that concrete alkalescence declines and in concrete, chemical composition changes.Carbonizable substance is calcium hydroxide or calcium salt and hydrated calcium silicate etc. mainly, and for calcium hydroxide, reaction equation is as follows.
Ca(OH)
2+H
2O+CO
2→CaCO
2+2H
2O(1)
3CaO·2SiO
2·H
2O+3CO
2→3CaCO
3·2SiO
2·H
2O(2)
The invention has the beneficial effects as follows:
Research shows, without the regeneration aggregate surface of intensive treatment containing a large amount of microfracture, causes that regeneration aggregate porosity is comparatively large, water-intake rate is higher.In method of the present invention, aqua calcis or calcium salt soln process are when improving the carbonizable substance content in regeneration aggregate, after carbonizing treatment, the calcium carbonate formed effectively fills tiny crack, and effectively reduces regeneration aggregate porosity, and then reduces aggregate crush values, reduction aggregate water-intake rate.In addition, sieved by construction waste crushing in the recycled fine aggregate obtained that regenerative micro powder content can up to 20%, high powder content causes the mobility regenerating mortar fresh paste lower, and according to after the inventive method process, the grating of regeneration aggregate changes, fineness modulus slightly increases, thus makes regeneration mortar mobility improve nearly 38.5%.Meanwhile, the ultimate compression strength regenerating mortar improves nearly 20%.
The present invention and existing patent and bibliographical information difference: (1) existing patent and literature processing be discarded concrete test block, the length of time is generally no more than 1 year, containing carbonizable substances such as higher CH, and our process is the concrete of waste and old building, and carbonizable substance is few.(2), before carbonization, adopt and increase calcium solution immersion.
Embodiment
Below in conjunction with specific embodiment, the present invention is further described, but protection scope of the present invention is not limited in this.
Embodiment 1
The present embodiment comprises the following steps:
(1) Ca (OH)
2solution-treated: be laid in by recycled fine aggregate in pallet, spraying parameter C is the Ca (OH) of 0.01mol/kg
2the aqueous solution also stirs, and controlling its water ratio is 5%.
(2) CO
2intensive treatment: will through Ca (OH)
2recycled fine aggregate after aqueous solution process is placed in airtight carbonization case, and control temperature is 30 DEG C, relative humidity is 50%, CO
2concentration is 75%, and carbonizing treatment is complete to surface carbonation.
(3) preparation of mortar is regenerated: utilize the recycled fine aggregate processed to prepare the regeneration mortar that Replacement rate is 100%.
Reference standard GB/T25176-2010 " concrete and mortar recycled fine aggregate " and GB/T14684-2011 " construction sand " investigates the fundamental property of aggregate before and after carbonizing treatment, as shown in table 1, after result shows to add calcium, carbonizing treatment effectively can reduce water-intake rate and the crush values index of regeneration concrete fine aggregate, powder content significantly reduces, regeneration ratio of water dosage significantly reduces, and apparent density slightly reduces.
Performances of Recycled Aggregate of Existing before and after table 1 carbonization
The present embodiment is obtained through CO
2aggregate of recycled concrete after intensive treatment and undressed recycled fine aggregate, respectively according to cement mortar rate 1:4, water cement ratio 0.7 makes mortar specimen; Utilize untreated recycled fine aggregate respectively according to cement-sand ratio be 1:4, water cement ratio be 0.75 preparation regeneration mortar.Test mortar fresh paste denseness and 7d, 28d ultimate compression strength as shown in table 2.Result shows, under identical water cement ratio condition, carbonizing treatment effectively can improve regeneration mortar mobility, makes it meet engineer applied; Compared with the undressed regeneration mortar under same denseness condition, 7d ultimate compression strength improves about 15.1%, 28d ultimate compression strength and improves nearly 18.1%.
Table 2 regenerates slurry consistency and ultimate compression strength
Embodiment 2
The present embodiment comprises the following steps:
(1) Ca (OH)
2solution-treated: be laid in by recycled fine aggregate in pallet, spraying parameter C is the Ca (OH) of 0.05mol/kg
2the aqueous solution also stirs, and controlling its water ratio is 0.2%.
(2) CO
2intensive treatment: will through Ca (OH)
2recycled fine aggregate after aqueous solution process is placed in airtight carbonization case, and control temperature is 10 DEG C, CO
2concentration is 100%, and carbonizing treatment is complete to surface carbonation.
(3) preparation of mortar is regenerated: utilize the recycled fine aggregate processed to prepare the regeneration mortar that Replacement rate is 100%.
After result shows to add calcium, carbonizing treatment effectively can reduce water-intake rate and the crush values index of regeneration concrete fine aggregate, as shown in table 3.
Performances of Recycled Aggregate of Existing before and after table 3 carbonization
The present embodiment is obtained through CO
2aggregate of recycled concrete after intensive treatment is according to cement-sand ratio 1:4, and water cement ratio 0.875 makes mortar specimen; Utilize untreated Aggregate of recycled concrete according to cement-sand ratio be 1:4, water cement ratio be 0.870 preparation regeneration mortar.Test mortar fresh paste denseness and 7d, 28d ultimate compression strength as shown in table 4.Result shows, carbonizing treatment effectively can improve regeneration mortar mobility, makes it meet engineer applied; Meanwhile, the regeneration mortar 7d prepared by carbonization aggregate and 28d ultimate compression strength improve about 26.36% and 23.84% respectively.
Table 4 regenerates slurry consistency and ultimate compression strength
Embodiment 3
The present embodiment comprises the following steps:
(1) calcium chloride solution process: be laid in by recycled fine aggregate in pallet, spraying parameter C is the calcium chloride water of 0.01mol/kg and stirs, and controlling regeneration aggregate water ratio is 10%.
(2) CO
2intensive treatment: the recycled fine aggregate after calcium chloride water process is placed in airtight carbonization case, control temperature is 50 DEG C, relative humidity is 20%, CO
2concentration is 20%, and carbonizing treatment is complete to surface carbonation.
(3) preparation of mortar is regenerated: utilize the recycled fine aggregate processed to prepare the regeneration mortar that Replacement rate is 100%.As shown in table 5.
Performances of Recycled Aggregate of Existing before and after table 5 carbonization
The present embodiment is obtained through CO
2aggregate of recycled concrete after intensive treatment is according to cement-sand ratio 1:4, and water cement ratio 0.875 makes mortar specimen; Utilize untreated Aggregate of recycled concrete according to cement-sand ratio be 1:4, water cement ratio be 0.870 preparation regeneration mortar.Test mortar fresh paste denseness and 7d, 28d ultimate compression strength as shown in table 6.Result shows, carbonizing treatment effectively can improve regeneration mortar mobility, makes it meet engineer applied; Meanwhile, the regeneration mortar 7d prepared by carbonization aggregate and 28d ultimate compression strength improve nearly 18.38% and 17.50% respectively.
Table 6 regenerates slurry consistency and ultimate compression strength
Embodiment 4
The present embodiment comprises the following steps:
(1) Ca (NO
3)
2solution-treated: be laid in by recycled fine aggregate in pallet, spraying parameter C is the Ca (OH) of 0.01mol/kg
2the aqueous solution also stirs, and controlling its water ratio is 5%.
(2) CO
2intensive treatment: will through Ca (NO
3)
2recycled fine aggregate after aqueous solution process is placed in airtight carbonization case, and control temperature is 30 DEG C, relative humidity is 50%, CO
2concentration is 75%, and carbonizing treatment is complete to surface carbonation.
(3) preparation of mortar is regenerated: utilize the recycled fine aggregate processed to prepare the regeneration mortar that Replacement rate is 100%.
Reference standard GB/T25176-2010 " concrete and mortar recycled fine aggregate " and GB/T14684-2011 " construction sand " investigates the fundamental property of aggregate before and after carbonizing treatment, as shown in table 7, after result shows to add calcium, carbonizing treatment effectively can reduce water-intake rate and the crush values index of regeneration concrete fine aggregate, powder content significantly reduces, regeneration ratio of water dosage significantly reduces, and apparent density slightly reduces.
Performances of Recycled Aggregate of Existing before and after table 7. carbonization
The present embodiment is obtained through CO
2aggregate of recycled concrete after intensive treatment is according to cement-sand ratio 1:4, and water cement ratio 0.875 makes mortar specimen; Utilize untreated Aggregate of recycled concrete according to cement-sand ratio be 1:4, water cement ratio be 0.825 preparation regeneration mortar.Test mortar fresh paste denseness and 7d, 28d ultimate compression strength as shown in table 8.Result shows, carbonizing treatment effectively can improve regeneration mortar mobility, makes it meet engineer applied; Meanwhile, the regeneration mortar 7d prepared by carbonization aggregate and 28d ultimate compression strength improve nearly 13% and 22% respectively.
Table 8 regenerates slurry consistency and ultimate compression strength
Comparative example
This comparative example comprises the following steps:
(1) CO
2intensive treatment: original state recycled fine aggregate (regulate water ratio be 5%) is placed in airtight carbonization case, control temperature is 30 DEG C, relative humidity is 50%, CO
2concentration is 75%, and carbonizing treatment is complete to surface carbonation.
(2) preparation of mortar is regenerated: utilize the recycled fine aggregate processed to prepare the regeneration mortar that Replacement rate is 100%.
Reference standard GB/T25176-2010 " concrete and mortar recycled fine aggregate " and GB/T14684-2011 " construction sand " investigates the fundamental property of aggregate before and after carbonizing treatment, as shown in table 9, result shows not add the regeneration concrete fine aggregate fundamental property of carbonizing treatment after calcium without considerable change.
Performances of Recycled Aggregate of Existing before and after table 9 carbonization
This comparative example is obtained through CO
2aggregate of recycled concrete after intensive treatment is according to cement-sand ratio 1:4, and water cement ratio 0.875 makes mortar specimen; Utilize untreated Aggregate of recycled concrete according to cement-sand ratio be 1:4, water cement ratio be 0.870 preparation regeneration mortar.Test mortar fresh paste denseness and 7d, 28d ultimate compression strength as shown in table 10.Result shows, not obvious to improvement regeneration mortar mobility and mechanical property effect without adding calcium and direct carbonization aggregate, this also absolutely proves the importance and necessity that calcium source processes.
Table 10 regenerates slurry consistency and ultimate compression strength
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. utilize a method for carbonic acid gas intensifying regenerating concrete fine aggregate, it is characterized in that: comprise the following steps:
(1) aqua calcis or calcium salt add Calcium treatment: get the recycled fine aggregate prepared by building waste and be laid in pallet, and rear sprinkling calcium hydroxide or calcium salt soln also stir;
(2) CO
2maintenance: be placed in airtight carbonization case by adding the recycled fine aggregate after Calcium treatment through aqua calcis or calcium salt, carbonized maintaining is complete to surface carbonation;
(3) preparation of mortar is regenerated: utilize the recycled fine aggregate processed to prepare the regeneration mortar that Replacement rate is 100%.
2. utilize the method for carbonic acid gas intensifying regenerating concrete fine aggregate as claimed in claim 1, it is characterized in that: in step (1), described calcium salt is calcium chloride or nitrocalcite.
3. utilize the method for carbonic acid gas intensifying regenerating concrete fine aggregate as claimed in claim 1, it is characterized in that: in step (1), recycled fine aggregate particle diameter is less than 4.75mm.
4. utilize the method for carbonic acid gas intensifying regenerating concrete fine aggregate as claimed in claim 1, it is characterized in that: in step (1), definition aqua calcis parameter C, C is the ratio of the quality of calcium hydroxide amount of substance used and its process aggregate, and C value scope is 0.01mol/kg ~ 0.05mol/kg.
5. utilize the method for carbonic acid gas intensifying regenerating concrete fine aggregate as claimed in claim 1, it is characterized in that: in step (1), the solvent quality of calcium hydroxide or calcium salt soln is determined by the water ratio of regeneration aggregate during carbonizing treatment, and regeneration aggregate moisture control is 0.2% ~ 10%.
6. utilize the method for carbonic acid gas intensifying regenerating concrete fine aggregate as claimed in claim 1, it is characterized in that: in step (2), during carbonizing treatment, control temperature is 10 DEG C ~ 50 DEG C.
7. utilize the method for carbonic acid gas intensifying regenerating concrete fine aggregate as claimed in claim 1, it is characterized in that: in step (2), relative humidity 20% ~ 75% during carbonizing treatment.
8. utilize the method for carbonic acid gas intensifying regenerating concrete fine aggregate as claimed in claim 1, it is characterized in that: in step (2), CO during carbonizing treatment
2concentration 20% ~ 100%.
9. utilize the method for carbonic acid gas intensifying regenerating concrete fine aggregate as claimed in claim 1, it is characterized in that: the middle surface carbonation of step (2) the completely method of inspection is: tiling regeneration aggregate, spray phenolphthalein reagent, sample carbonization surface nondiscoloration, sample part carbonization then reddens.
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