CN109851266A - A kind of aggregate processing method enhancing construction refuse regenerated concrete chlorine salt resistant erosion performance - Google Patents
A kind of aggregate processing method enhancing construction refuse regenerated concrete chlorine salt resistant erosion performance Download PDFInfo
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- CN109851266A CN109851266A CN201910055037.7A CN201910055037A CN109851266A CN 109851266 A CN109851266 A CN 109851266A CN 201910055037 A CN201910055037 A CN 201910055037A CN 109851266 A CN109851266 A CN 109851266A
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- construction refuse
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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 kind of aggregate processing methods for enhancing construction refuse regenerated concrete chlorine salt resistant erosion performance, the following steps are included: (1) is by discarded concrete class building waste through processes such as rough segmentation, sorting removal of impurities, crushing and screenings, construction refuse regenerated coarse aggregate is obtained, and spare after natural air drying；(2) regenerated coarse aggregate obtained in step (1) is impregnated into white lime lotion, and every 10min is turned once, is then taken out, and dried in the air indoors for 24 hours, moved into baking oven dry later；(3) regenerated coarse aggregate obtained in step (2) is laid in pallet, and moves into progress neutralisation processing in concrete carbonization case；(4) by gained regenerated coarse aggregate replacing whole natural rubble aggregate in step (3), regeneration concrete is prepared.Construction refuse regenerated coarse aggregate processing method provided by the present invention is significant for the promotion effect of regeneration concrete precenting chlorate corrosion performance.
Description
Technical field
The present invention relates to a kind of aggregate processing methods for enhancing regeneration concrete precenting chlorate corrosion performance, belong to discarded coagulation
Great soil group is construction refuse regenerated to utilize technical field.
Background technique
Currently, China is in the peak period of infrastructure construction, needs to consume a large amount of cement concrete material.If
Concrete is only produced by lithotome, then the exhaustive exploitation of sandstone aggregate will necessarily do great damage to ecological environment.Together
When, a large amount of building waste is generated with the construction of extensive novel concrete structures and the dismounting of waste and old structures, is obtained not
A series of problems is brought to being effectively treated, such as occupies valuable soil, and cause environment and social concern etc..Currently, right
The construction refuse regenerated main path utilized is recycled aggregate to be produced, for giving birth to after building waste is sorted, be crushed and is sieved
Produce cement concrete.On the one hand it is tired to can be relieved building waste processing for the exploitation and application of recycled aggregate and recycled concrete
On the other hand deterioration of the ecological environment problem difficult and resulting from can be relieved the increasingly deficient pressure of natural aggregate.
Compared with natural aggregate concrete, regeneration concrete due to recycled aggregate particularity and have working performance, power
Learn performance and the poor feature of endurance quality.Currently regeneration concrete can be made to meet needed for engineering by optimization of mix proportion
Working performance and mechanical property requirement, and mechanical property can achieve high-strength concrete C80 strength grade.But due to durable
Property is poor, and effective solution is not yet received in especially precenting chlorate corrosion performance deficiency problem, so regeneration concrete is in cold district
The case applied in concrete structures in deicing salt environment or littoral environment is less, greatly limits its use scope.
Currently, the method handled both at home and abroad recycled aggregate mainly has chemical method, physical method and biological method
Etc. several classes.Wherein, equipment investment needed for physical method is big, and abrasion and power capacity consumption are also big, in regenerated coarse aggregate
Portion's damage has facilitation；Biological method technology is immature, and experimental condition requirement is harsh, not easy to control；In chemical method
Solution dipping method mostly uses organosilan, organic polymer soln or some other waterproof material, expensive；Due to Regenerated Bone
Expect that neutral and alkali content of material is less, the improvement of the method for tradition carbonization aggregate to the precenting chlorate corrosion performance of regeneration concrete
It is not significant；That there are corrosivity is strong for acid solution infusion method, has certain damage to carbonate aggregate, and destroy in regeneration concrete
Portion's alkaline environment；Wrapping up in slurry processes is by cement, flyash, miberal powder, silicon ash etc. be single or multiple material is formed slurry to Regenerated Bone
Material is wrapped up, simple process, good economy performance, but improvement is limited.
Summary of the invention
Based on the deficiencies in the prior art, the present invention provides a kind of construction refuse regenerated concrete chlorine salt resistant of enhancing and invades
The aggregate processing method of corrosion energy can be effectively reduced regenerated coarse aggregate crush values, water absorption rate, and the hole of attachment mortar
Rate is obviously improved construction refuse regenerated concrete chlorine salt resistant erosion performance.
To achieve the above object, the invention adopts the following technical scheme:
A kind of aggregate processing method enhancing construction refuse regenerated concrete chlorine salt resistant erosion performance, comprising the following steps:
(1) construction refuse regenerated coarse aggregate preparation: discarded concrete class building waste is cleaned through rough segmentation, sorting, is broken
The processes such as screening, obtain construction refuse regenerated coarse aggregate, and spare after natural air drying.
(2) construction refuse regenerated coarse aggregate pretreatment: regenerated coarse aggregate obtained in step (1) is impregnated to white lime cream
In liquid, and every 10min is turned once, is then taken out, and is dried in the air indoors for 24 hours, moves into baking oven dry later.
(3) regenerated coarse aggregate obtained in step (2) construction refuse regenerated coarse aggregate neutralisation processing: is laid in pallet
It is interior, and move into progress neutralisation processing in concrete carbonization case.
(4) construction refuse regenerated concrete preparation: by gained regenerated coarse aggregate replacing whole natural rubble bone in step (3)
Material, prepares regeneration concrete.
Further, in step (1), regenerated coarse aggregate particle size range is 5~25mm；
Further, in step (2), to guarantee that regenerated coarse aggregate treatment effect, white lime emulsion concentration are controlled in 1:10
~1:20 (mass ratio of white lime powder and water)；
Further, in step (2), according to the rate of water absorption variation characteristic of recycled aggregate, recycled aggregate is impregnated in ripe stone
Time in grey lotion controls in 30~60min；
Further, in step (2), to avoid hot environment from causing secondary damage, oven temperature control to regenerated coarse aggregate
System is at 60~80 DEG C；
Further, in step (3), the carbonization case is concrete high-speed carbonation test case, A.T.C
It is 20 ± 3 DEG C, gas concentration is 20 ± 3%, and humidity is 70 ± 5%；
Further, in step (3), to guarantee treatment effect of the recycled aggregate in carbonization case, the control of neutralisation time
In 7~14d.
A kind of aggregate processing method enhancing construction refuse regenerated concrete chlorine salt resistant erosion performance provided by the present invention,
The principle is as follows: construction refuse regenerated coarse aggregate mortar adhesive rate is higher, and generally 30~60%, porosity is higher, and broken
It is internal in broken, screening process to generate a large amount of micro-cracks, cause recycled aggregate second-rate.Recycled aggregate is impregnated to white lime cream
In liquid, CH can penetrate into aperture hole, the macropore of surface attachment mortar, and in internal micro-crack, connect with sour gas
Carbonate substance, and volume expansion about 9%, filling attachment mortar interior section hole and micro-crack can be generated when touching, so that
Recycled aggregate becomes dense, this extends diffusion path of the chloride ion in regeneration concrete to a certain extent, to reach
The purpose for hindering villaumite infiltration and corroding.
Compared with existing recycled aggregate processing technique, the invention has the following advantages:
1) equipment investment needed for is small, and without developing new equipment, equipment needed for neutralisation continues to use concrete durability experiment
Equipment can be met the requirements, and power capacity consumption is small.
2) treated, and Performances of Recycled Aggregate of Existing promotes significant effect.Compared with untreated regenerated coarse aggregate, treated again
Raw coarse aggregate apparent density improves 1.21~2.59%, and crush values reduce 15.53~19.10%, and water absorption rate reduces
5.49~7.80%, attachment mortar porosity reduces 17.62~27.42%, and the regeneration concrete prepared is in curing age
Chloride ion transport coefficient when for 7~56d reduces 13.76~27.18%.
3) this method will not cause secondary damage to regenerated coarse aggregate, and will not destroy alkaline ring inside regeneration concrete
Border.
4) this method good economy performance, easy to operate, easy to control, practical application is strong.
5) this method can promote concrete of the regeneration concrete in cold district deicing salt environment or littoral environment and construct
Application in object is conducive to the consumption and recycling of construction refuse regenerated aggregate.
Below in conjunction with specific embodiment, invention is further explained.
Specific embodiment
The present invention is illustrated in more detail below with reference to specific implementation case.It should be noted that guarantor of the invention
Shield range is not limited thereto.
Embodiment 1
The present embodiment the following steps are included:
(1) construction refuse regenerated coarse aggregate preparation: discarded concrete class building waste is cleaned through rough segmentation, sorting, is broken
The processes such as screening obtain the regenerated coarse aggregate that particle size range is 5~25mm, and spare after natural air drying.
(2) construction refuse regenerated coarse aggregate pretreatment: it is 1 that regenerated coarse aggregate obtained in step (1), which is immersed in concentration:
30min in 10 white lime lotion, and every 10min is turned once, is then taken out, and is dried in the air indoors for 24 hours, moves into 60 DEG C of bakings later
It is dried in case.
(3) regenerated coarse aggregate obtained in step (2) construction refuse regenerated coarse aggregate neutralisation processing: is laid in pallet
It is interior, and move into concrete carbonization case (controlled at 20 ± 3 DEG C, gas concentration is 20 ± 3%, and humidity is 70 ± 5 DEG C) into
Row neutralisation handles 14d.
(4) construction refuse regenerated concrete preparation: by gained regenerated coarse aggregate replacing whole natural rubble bone in step (3)
Material, prepares regeneration concrete.
With reference to GB/T 25177-2010 " concrete regenerated coarse aggregate ", before the processing of test architecture garbage regeneration coarse aggregate
The indexs such as apparent density, water absorption rate, crush values afterwards.By recycled aggregate is crushed, screening obtains partial size with treated before processing
For the particle of 2.36~4.75mm, hand picking goes out net slurry particle about 6g, carries out Mercury injection test, obtains recycled aggregate attachment mortar
Porosity index.Test result shows that compared with untreated recycled aggregate, treated, and recycled aggregate apparent density is increased
2.59%, crush values, water absorption rate and attachment mortar porosity in turn reduce 19.10%, 7.80%, 27.42% respectively, regeneration
Coarse aggregate performance boost is obvious, as shown in table 1.
The construction refuse regenerated coarse aggregate of table 1 performance comparison before and after the processing
Untreated recycled aggregate is prepared with treated recycled aggregate with identical match ratio (ratio of mud 0.48) respectively
Construction refuse regenerated concrete, the slump index of regeneration concrete material is newly mixed in test, with reference to GB/T 50082-2009
RCM method in " Standard for test methods of longterm performance and durability of ordinary concrete standard ", test hardening regeneration concrete material exist
Chloride ion fast transferring coefficient when standard curing 7d, 28d, 56d, the results are shown in Table 2.
The construction refuse regenerated coarse aggregate concrete performance comparison before and after the processing of table 2
The result shows that compared with the concrete of untreated recycled aggregate preparation, the coagulation for recycled aggregate preparation that treated
Native working performance outline is more excellent, at the same chloride ion fast transferring coefficient when 7d, 28d, 56d reduce 22.39% respectively,
26.85%, 27.18%, illustrate that construction refuse regenerated coarse aggregate processing method provided by the present invention is anti-for regeneration concrete
The promotion effect of chloride erosion performance is significant.
Embodiment 2
The present embodiment the following steps are included:
(1) construction refuse regenerated coarse aggregate preparation: discarded concrete class building waste is cleaned through rough segmentation, sorting, is broken
The processes such as screening obtain the regenerated coarse aggregate that particle size range is 5~25mm, and spare after natural air drying.
(2) construction refuse regenerated coarse aggregate pretreatment: it is 1 that regenerated coarse aggregate obtained in step (1), which is immersed in concentration:
60min in 20 white lime lotion, and every 10min is turned once, is then taken out, and is dried in the air indoors for 24 hours, moves into 80 DEG C of bakings later
It is dried in case.
(3) regenerated coarse aggregate obtained in step (2) construction refuse regenerated coarse aggregate neutralisation processing: is laid in pallet
It is interior, and move into concrete carbonization case (controlled at 20 ± 3 DEG C, gas concentration is 20 ± 3%, and humidity is 70 ± 5 DEG C) into
Row neutralisation handles 7d.
(4) construction refuse regenerated concrete preparation: by gained regenerated coarse aggregate replacing whole natural rubble bone in step (3)
Material, prepares regeneration concrete.
Test result shows that compared with untreated recycled aggregate, treated, and recycled aggregate apparent density is increased
1.21%, crush values, water absorption rate and attachment mortar porosity in turn reduce 15.53%, 5.49%, 19.95% respectively, regeneration
Coarse aggregate performance boost is obvious, as shown in table 3.
The construction refuse regenerated coarse aggregate of table 3 performance comparison before and after the processing
Untreated recycled aggregate is prepared with treated recycled aggregate with identical match ratio (ratio of mud 0.50) respectively
Construction refuse regenerated concrete, test newly mixes the slump index of regeneration concrete material, while testing hardening regeneration concrete
Chloride ion fast transferring coefficient of the material in standard curing 7d, 28d, 56d, the results are shown in Table 4.
The construction refuse regenerated coarse aggregate concrete performance comparison before and after the processing of table 4
The result shows that compared with the concrete of untreated recycled aggregate preparation, the coagulation for recycled aggregate preparation that treated
Native working performance outline is more excellent, at the same chloride ion fast transferring coefficient when 7d, 28d, 56d reduce 13.76% respectively,
22.45%, 19.73%, illustrate that construction refuse regenerated coarse aggregate processing method provided by the present invention is anti-for regeneration concrete
The promotion effect of chloride erosion performance is significant.
Embodiment 3
The present embodiment the following steps are included:
(1) construction refuse regenerated coarse aggregate preparation: discarded concrete class building waste is cleaned through rough segmentation, sorting, is broken
The processes such as screening obtain the regenerated coarse aggregate that particle size range is 5~25mm, and spare after natural air drying.
(2) construction refuse regenerated coarse aggregate pretreatment: it is 1 that regenerated coarse aggregate obtained in step (1), which is immersed in concentration:
40min in 15 white lime lotion, and every 10min is turned once, is then taken out, and is dried in the air indoors for 24 hours, moves into 70 DEG C of bakings later
It is dried in case.
(3) regenerated coarse aggregate obtained in step (2) construction refuse regenerated coarse aggregate neutralisation processing: is laid in pallet
It is interior, and move into concrete carbonization case (controlled at 20 ± 3 DEG C, gas concentration is 20 ± 3%, and humidity is 70 ± 5 DEG C) into
Row neutralisation handles 10d.
(4) construction refuse regenerated concrete preparation: by gained regenerated coarse aggregate replacing whole natural rubble bone in step (3)
Material, prepares regeneration concrete.
Test result shows that compared with untreated recycled aggregate, treated, and recycled aggregate apparent density is increased
1.35%, crush values, water absorption rate and attachment mortar porosity in turn reduce 16.00%, 5.58%, 17.62% respectively, regeneration
Coarse aggregate performance boost is obvious, as shown in table 5.
The construction refuse regenerated coarse aggregate of table 5 performance comparison before and after the processing
Untreated recycled aggregate is prepared with treated recycled aggregate with identical match ratio (ratio of mud 0.44) respectively
Construction refuse regenerated concrete, test newly mixes the slump index of regeneration concrete material, while testing hardening regeneration concrete
Chloride ion fast transferring coefficient of the material in standard curing 7d, 28d, 56d, the results are shown in Table 6.
The construction refuse regenerated coarse aggregate concrete performance comparison before and after the processing of table 6
The result shows that compared with the concrete of untreated recycled aggregate preparation, the coagulation for recycled aggregate preparation that treated
Native working performance outline is more excellent, at the same chloride ion fast transferring coefficient when 7d, 28d, 56d reduce 14.36% respectively,
23.53%, 25.58%, illustrate that construction refuse regenerated coarse aggregate processing method provided by the present invention is anti-for regeneration concrete
The promotion effect of chloride erosion performance is significant.
Claims (7)
1. a kind of aggregate processing method for enhancing construction refuse regenerated concrete chlorine salt resistant erosion performance, it is characterised in that: including
Following steps,
The construction refuse regenerated coarse aggregate preparation of step (1): discarded concrete class building waste is cleaned through rough segmentation, sorting, is broken
The processes such as screening, obtain construction refuse regenerated coarse aggregate, and spare after natural air drying；
The construction refuse regenerated coarse aggregate pretreatment of step (2): regenerated coarse aggregate obtained in step (1) is impregnated to white lime cream
In liquid, and every 10min is turned once, is then taken out, and is dried in the air indoors for 24 hours, moves into baking oven dry later；
The construction refuse regenerated coarse aggregate neutralisation processing of step (3): regenerated coarse aggregate obtained in step (2) is laid in pallet
It is interior, and move into progress neutralisation processing in concrete carbonization case；
The construction refuse regenerated concrete preparation of step (4): by gained regenerated coarse aggregate replacing whole natural rubble bone in step (3)
Material, prepares regeneration concrete.
2. a kind of aggregate processing side for enhancing construction refuse regenerated concrete chlorine salt resistant erosion performance according to claim 1
Method, it is characterised in that: in the step (1), regenerated coarse aggregate particle size range is 5~25mm.
3. a kind of aggregate processing side for enhancing construction refuse regenerated concrete chlorine salt resistant erosion performance according to claim 1
Method, it is characterised in that: in the step (2), to guarantee that regenerated coarse aggregate treatment effect, white lime emulsion concentration are controlled in 1:10
~1:20, the i.e. mass ratio of white lime powder and water.
4. a kind of aggregate processing side for enhancing construction refuse regenerated concrete chlorine salt resistant erosion performance according to claim 1
Method, it is characterised in that: in the step (2), according to the rate of water absorption variation characteristic of recycled aggregate, recycled aggregate is impregnated in ripe stone
Time in grey lotion controls in 30~60min.
5. a kind of aggregate processing side for enhancing construction refuse regenerated concrete chlorine salt resistant erosion performance according to claim 1
Method, it is characterised in that: in the step (2), oven temperature is controlled at 60~80 DEG C.
6. a kind of aggregate processing side for enhancing construction refuse regenerated concrete chlorine salt resistant erosion performance according to claim 1
Method, it is characterised in that: in the step (3), the carbonization case is concrete high-speed carbonation test case, A.T.C
It is 20 ± 3 DEG C, gas concentration is 20 ± 3%, and humidity is 70 ± 5%.
7. a kind of aggregate processing side for enhancing construction refuse regenerated concrete chlorine salt resistant erosion performance according to claim 1
Method, it is characterised in that: in the step (3), to guarantee treatment effect of the recycled aggregate in carbonization case, the control of neutralisation time
In 7~14d.
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| CN110357473A (en) * | 2019-06-25 | 2019-10-22 | 南京工业大学 | Carbonized reinforced recycled aggregate and preparation method and application thereof |
| CN111170687A (en) * | 2020-02-19 | 2020-05-19 | 广东派安建材有限公司 | Method for manufacturing recycled aggregate green concrete |
| CN112500174A (en) * | 2020-12-28 | 2021-03-16 | 山东恒嘉高纯铝业科技股份有限公司 | Preparation process and equipment of anti-erosion aggregate for steel ladle |
| CN113955994A (en) * | 2021-11-05 | 2022-01-21 | 常州大学 | Preparation method of regenerated coarse aggregate concrete resistant to chloride ion corrosion |
| CN113968687A (en) * | 2021-11-12 | 2022-01-25 | 同济大学 | Pretreatment strengthening method of recycled aggregate and preparation method of recycled concrete |
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Application publication date: 20190607 |