CN103351107A - Method for low temperature separation of waste concrete - Google Patents
Method for low temperature separation of waste concrete Download PDFInfo
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- CN103351107A CN103351107A CN2013102115397A CN201310211539A CN103351107A CN 103351107 A CN103351107 A CN 103351107A CN 2013102115397 A CN2013102115397 A CN 2013102115397A CN 201310211539 A CN201310211539 A CN 201310211539A CN 103351107 A CN103351107 A CN 103351107A
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- concrete
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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
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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 belongs to the building material field, and relates to a method for the low temperature separation of waste concrete. The method is characterized in that a low temperature heating and particle shaping superposed technology is adopted to separate aggregates from a hardened cement paste by utilizing the difference of the thermal expansion coefficients of different phases of concrete, and the aggregates are screened to obtain regenerated coarse aggregates having a particle size of 5-26.5mm, regenerated fine aggregates having a particle size of 0.315-5mm, and a regenerated admixture having a particle size of below 0.315mm. The method realizes the complete reutilization of the regenerated aggregates and the regenerated admixture on the basis of the zero discharge of waste concrete solids. The temperature of the low temperature heating in the separating technology is 200DEG C, so energy consumed by low temperature heating separation is less than the energy consumed by high temperature separation. The regenerated admixture does not influence the strength or the fluidity of a colloidal mortar after substituting 5% or less of cement, and the regenerated coarse aggregates do not influence the strength or the fluidity of concrete after substituting 60% of natural coarse aggregates.
Description
Technical field
The invention belongs to building material technical field, relate to a kind of discarded concrete low ternperature separation process technical matters.
Background technology
The fast development of construction industry causes discarded concrete to increase sharply, and not only takies a large amount of soils and deposits, and easily cause in stacking and scale removal process and drop and the problems such as dust, sand-lime fly upward, serious environment pollution.Although these " building wastes " can not directly apply to build and produce, all kinds of mineral wealth that wherein contain still have use value, and this part material is given it up objectively forms waste.Particularly the concrete ore resource of current nationwide is deficient, and in May, 2012, China issued " prohibiting sand makes ", had objectively aggravated again the situation that starting material lack.If discarded concrete is fully utilized after a series of simple process, make regeneration aggregate and be processed into and produce raw material or the blended material that cement is used, not only can reduce the discarded concrete discharging, and can remedy scarcity of resources present situation, the energy consumption of reduction production cement, minimizing CO
2Comprehensive economic and social benefit is created in discharging
The existing representative art document in this area comprises:
Chinese patent: the method that a kind of waste concrete component separates, the patent No.: 200610019242.0; It is the characteristics of concrete and mortar body weak link that this invention utilizes the interfacial transition zone between cement slurry and the aggregate, adopt the methods such as fragmentation, heating, grinding to make progress of fracture original and newborn in the interfacial transition zone and extension, after under mutually bump and frictional force effect, aggregate and petrifying water mudstone being separated, the employing material sieving technology is isolated, and then obtain regenerated coarse aggregate, while is different according to quartz sand and petrifying water mudstone grindability, selects " winnowing powder " that fine aggregate is separated with Behavior of Hardened Cement Paste.
Chinese patent: discarded concrete is produced the method for regeneration aggregate and recycled cement, the patent No.: 200710144945; This invention is directly calcined the concrete of fragmentation under 750 ℃ hot conditions, make the more completely dehydration of mortar body to destroy the bonding of itself and aggregate, both fully separation have almost been realized, prepared high-quality regenerated coarse aggregate, and verified that the dehydration cement slurry has the ability of rehydration, but the part place of cement is used for engineering.
Open happiness, Wu Yongsheng, Zhang Jianbo, Deng. the activity excitation of construction waste concrete fine powder and recycling feasibility analysis [J]. point out: partly there is unhydrated particle in the fine powder of separating in the discarded concrete, can make after 600 ℃ of thermal treatment it not that the aquation particle reaches best aquation effect, can Partial Replacement cement as gelling material
Han Bing, Sun Tongchun, Li Qiuyi. the performance study [J] of the concrete regenerating sand of different process preparation. confirm: the simple crushing reclaimed sand performance through " particle shaping " all makes moderate progress, and basic symbols is closed the standard of building sand, and can be used as the fine aggregate of configuration weak concrete.
As structure material, aggregate proportion in concrete is 70 ~ 80%, and therefore the deficient just matter of time of its natural resource is necessary discarded concrete is carried out separating treatment very much, reaching the change expense is precious purpose, and thermal treatment temp will be considered emphatically in separating.No matter be above-mentioned two kinds of inventions or other discarded concrete separation methods, its special emphasis is all different, what have considers the aggregate quality, some consideration pulverized powder rehydration abilities, but its thermal treatment temp is too high, not only damages the intensity of original aggregate, and caused energy dissipation, its economic and energy saving index all can't guarantee, and the complex process front-end investment is large, and implementation and popularization acquire a certain degree of difficulty.
The present invention obtains regenerated coarse aggregate, recycled fine aggregate and recycled cement blended material from overall situation sight with the discarded concrete low ternperature separation process, from these three aspects discarded concrete is fully utilized, and has realized the solid " zero release " of discarded concrete.
Summary of the invention
For addressing the above problem, the invention provides a kind of simple discarded concrete separating technology.
Technical scheme of the present invention is as follows:
A kind of method of discarded concrete low ternperature separation process, utilize the different characteristics of each phase thermal expansivity in the concrete, adopt " low-temperature heat-particle shaping " method, will gather materials and sieve processing after Behavior of Hardened Cement Paste separates, and then obtain regeneration aggregate and recycled cement blended material.Concrete steps are as follows:
(1) heating: concrete test block is broken into the material that particle diameter is not more than 40mm, simultaneously to low-temperature material heating after the fragmentation, with 40 ℃/min constant-speed heating to 200 ℃, and constant temperature keeps 20min, to guarantee material inside and outside without the temperature difference, after constant temperature is finished, take out immediately and return to normal temperature.
(2) shaping separates: the material that obtains with step (1) grinds, and separates coarse aggregate and Behavior of Hardened Cement Paste, realizes mechanical shaping.
(3) screening: the material screening that step (2) is obtained is processed, particle diameter be 5 ~ 26.5mm as regenerated coarse aggregate, particle diameter be 0.315 ~ 5mm as recycled fine aggregate, particle diameter less than 0.315mm as the regeneration fine powder.
(4) grind: to the regeneration fine powder grinding that step (3) obtains, make its sieving rate (45 μ m square hole sieve) reach 78%, get grinding after material as the regenerative mixed material.
Further feature respectively is respectively coarse aggregate, Behavior of Hardened Cement Paste and the mortars such as Wingdale mutually in the concrete.
Further feature, low-temperature heat is to carry out in retort furnace.
It is mechanical shaping 3min in the cement testing mill that further feature, shaping are separated.
Compared with prior art, the invention has the beneficial effects as follows:
(1) the present invention has realized the fully recycling of regeneration aggregate and regenerative mixed material take discarded concrete solid " zero release " as the basis.
(2) low-temperature heat is 200 ℃ in the separating technology, relatively existing separating at high temperature, save energy.
(3) after the place of cement, cement mortar strength and flowability all do not affect the regenerative mixed material that is obtained by this technique in 5% scope.
(4) after the regenerated coarse aggregate 60% that is obtained by this technique substituted natural coarse aggregate, concrete intensity and flowability did not all affect.
(5) separating technology of the present invention is simple, and general stirring station all can independently be produced, and can concentrate to set up factories in large-and-medium size cities discarded concrete is processed.
Description of drawings
Accompanying drawing is process flow sheet of the present invention.
Embodiment
Be described in detail embodiments of the invention below in conjunction with technical scheme and accompanying drawing.
Embodiment 1
(1) with " universal press and jaw crusher " concrete test block is broken into the material that particle diameter is not more than 40mm.
(2) with the discarded concrete material after the fragmentation in retort furnace with 40 ℃/min constant-speed heating to 200 ℃, and constant temperature keeps taking out immediately behind the 20min and returns to normal temperature.
(3) grind heating rear material mechanical shaping 3min with cement testing, adding the shaping medium is steel ball, and its quality equals 8 times of waste material.
(4) with jarring formula standard vibration sieve material after the shaping is sieved processing, get particle diameter and be 5 ~ 26.5mm as regenerated coarse aggregate, 0.315 ~ 5mm is as recycled fine aggregate, less than 0.315mm as the regeneration fine powder.
(5) will regenerate behind the fine powder grinding 0.5h with ball mill, take out as the regenerative mixed material.
Embodiment 2
In the present embodiment, each proportioning raw materials is as shown in table 1, and wherein regenerated coarse aggregate is the twice-laid stuff that makes among the present invention.
Table 1 regenerated coarse aggregate concrete proportioning
Tab.1 Mix proportion of recycled coarse aggregate concrete
The regenerated coarse aggregate concrete that the present embodiment is made carries out the slump and strength test, and the result shows:
(1) the intensity substitution rate improves and increases.When substitution rate was 40%, the regenerated coarse aggregate concrete of 7 days and 28 days improved approximately 6.9% and 4.2% than benchmark, and substitution rate when being 60% intensity decrease, its value maintains an equal level with benchmark intensity.
(2) slump remains unchanged substantially with the volume increase, maintains an equal level with normal concrete.
Embodiment 2
In the present embodiment, each proportioning raw materials is as shown in table 2, and wherein recycled fine aggregate is the twice-laid stuff that makes among the present invention.
Table 2 glue sand test specimen proportioning
Tab.2 Mix proportion of mortar
The glue sand test specimen that the present embodiment is made carries out degree of mobilization and strength test, and the result shows:
(1) improve degree of mobilization with the reworked material substitution rate and reduce gradually, when wherein substitution rate was 30%, fluidity loss was about and adopts 14% of standard sand fully.
(2) gain in strength gradually and to increase along with the recycled fine aggregate volume, when substitution rate was 50%, 28 days folding strength approximately improved 3.3%, and ultimate compression strength approximately improves 6.7%.
Embodiment 4
In the present embodiment, each proportioning raw materials is as shown in table 3, and its regenerative mixed material is the twice-laid stuff that makes among the present invention.
Table 3 glue sand test specimen proportioning
Tab.3 Mix proportion of mortar
The glue sand test specimen that the present embodiment is made carries out strength test, the result shows: when volume is not more than 4%, its intensity increases than the benchmark sample, when wherein volume is 4%, 7 days ultimate compression strength improves approximately 4%, folding strength improves approximately 8%, 28 days ultimate compression strength improves approximately 7%, folding strength improves approximately 5%, and its intensity descends gradually when volume surpasses 4%.
Claims (5)
1. the method for a discarded concrete low ternperature separation process is characterized in that following steps:
(1) heating: concrete test block is broken into the material that particle diameter is not more than 40mm, simultaneously to low-temperature material heating after the fragmentation, with 40 ℃/min constant-speed heating to 200 ℃, and constant temperature keeps 20min, to guarantee material inside and outside without the temperature difference, after constant temperature is finished, take out immediately and return to normal temperature;
(2) shaping separates: the material that obtains with step (1) grinds, and separates coarse aggregate and Behavior of Hardened Cement Paste, realizes mechanical shaping;
(3) screening: the material screening that step (2) is obtained is processed, particle diameter be 5 ~ 26.5mm as regenerated coarse aggregate, particle diameter be 0.315 ~ 5mm as recycled fine aggregate, particle diameter less than 0.315mm as the regeneration fine powder;
(4) grind: to the regeneration fine powder grinding that step (3) obtains, make the sieving rate of its 45 μ m square hole sieve reach 78%, get grinding after material as the regenerative mixed material.
2. method according to claim 1 is characterized in that: in the step (1), respectively be respectively coarse aggregate, Behavior of Hardened Cement Paste and the mortars such as Wingdale mutually in the concrete.
3. method according to claim 1 and 2 is characterized in that, in the step (1), low-temperature heat is to carry out in retort furnace.
4. method according to claim 1 and 2 is characterized in that, in the step (2), it is mechanical shaping 3min in the cement testing mill that shaping separates.
5. method according to claim 3 is characterized in that, in the step (2), it is mechanical shaping 3min in the cement testing mill that shaping separates.
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| CN2013102115397A CN103351107A (en) | 2013-05-30 | 2013-05-30 | Method for low temperature separation of waste concrete |
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| CN2013102115397A CN103351107A (en) | 2013-05-30 | 2013-05-30 | Method for low temperature separation of waste concrete |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446077A (en) * | 2014-11-14 | 2015-03-25 | 中联重科物料输送设备有限公司 | Separation method and separation system for waste concrete and rolling separator |
| CN107127019A (en) * | 2017-06-19 | 2017-09-05 | 中国葛洲坝集团第五工程有限公司 | A kind of pitch prill concrete mineral aggregate system of processing and its processing method |
| CN108558255A (en) * | 2018-05-23 | 2018-09-21 | 河南理工大学 | The separation method of old mortar in a kind of regenerated coarse aggregate |
| CN111318550A (en) * | 2020-03-25 | 2020-06-23 | 深圳绿景环保再生资源有限公司 | Method for preparing recycled aggregate by using construction waste |
| CN112645658A (en) * | 2020-12-29 | 2021-04-13 | 南通友力混凝土有限公司 | High-strength recycled concrete and production process thereof |
| CN115536341A (en) * | 2022-10-26 | 2022-12-30 | 中建铁路投资建设集团有限公司 | Concrete for heating and shaping full-tunnel hole slag aggregate and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1857782A (en) * | 2006-06-01 | 2006-11-08 | 武汉理工大学 | Waste concrete component separating method |
| CN101215114A (en) * | 2007-12-27 | 2008-07-09 | 哈尔滨工业大学 | Method for producing regenerated aggregate and regenerated cement from discarded concrete |
-
2013
- 2013-05-30 CN CN2013102115397A patent/CN103351107A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1857782A (en) * | 2006-06-01 | 2006-11-08 | 武汉理工大学 | Waste concrete component separating method |
| CN101215114A (en) * | 2007-12-27 | 2008-07-09 | 哈尔滨工业大学 | Method for producing regenerated aggregate and regenerated cement from discarded concrete |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446077A (en) * | 2014-11-14 | 2015-03-25 | 中联重科物料输送设备有限公司 | Separation method and separation system for waste concrete and rolling separator |
| CN104446077B (en) * | 2014-11-14 | 2017-05-17 | 中联重科物料输送设备有限公司 | Separation method and separation system for waste concrete and rolling separator |
| CN107127019A (en) * | 2017-06-19 | 2017-09-05 | 中国葛洲坝集团第五工程有限公司 | A kind of pitch prill concrete mineral aggregate system of processing and its processing method |
| CN108558255A (en) * | 2018-05-23 | 2018-09-21 | 河南理工大学 | The separation method of old mortar in a kind of regenerated coarse aggregate |
| CN111318550A (en) * | 2020-03-25 | 2020-06-23 | 深圳绿景环保再生资源有限公司 | Method for preparing recycled aggregate by using construction waste |
| CN111318550B (en) * | 2020-03-25 | 2021-04-20 | 深圳绿景环保再生资源有限公司 | Method for preparing recycled aggregate by using construction waste |
| CN112645658A (en) * | 2020-12-29 | 2021-04-13 | 南通友力混凝土有限公司 | High-strength recycled concrete and production process thereof |
| CN115536341A (en) * | 2022-10-26 | 2022-12-30 | 中建铁路投资建设集团有限公司 | Concrete for heating and shaping full-tunnel hole slag aggregate and preparation method thereof |
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Application publication date: 20131016 |