CN110255983A - A kind of regeneration concrete and preparation method thereof - Google Patents
A kind of regeneration concrete and preparation method thereof Download PDFInfo
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- CN110255983A CN110255983A CN201910418986.7A CN201910418986A CN110255983A CN 110255983 A CN110255983 A CN 110255983A CN 201910418986 A CN201910418986 A CN 201910418986A CN 110255983 A CN110255983 A CN 110255983A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
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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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a kind of regeneration concrete and preparation method thereof, the preparation method includes the following steps: that S1. is broken by waste and old concrete, heats；S2. step S1. treated waste and old concrete is subjected to pulp separation, obtains aggregate and cement slurry；S3. the obtained cement slurry of step S2. is ground, high temperature cabonization processing, obtains recycled cement；S4. high temperature cabonization processing is carried out after aggregate screening step S2. obtained, obtains recycled aggregate；S5. recycled aggregate, additive and the water mixing obtained recycled cement, natural river sand, step S4. that step S3. is obtained, obtains the regeneration concrete.Preparation method provided by the invention can recycle aggregate and cement slurry in waste and old concrete, it is obtained functional to regeneration concrete, construction refuse resource utilization rate can also be effectively improved, reduce carbon emission amount, alleviate the climatic issues of global warming to a certain extent, the space that building waste is occupied can also be discharged, valuable land resource is saved.
Description
Technical field
The present invention relates to building material technical fields, more particularly, to a kind of regeneration concrete and preparation method thereof.
Background technique
The yield of the annual building waste in China accounts for the 30%~40% of municipal refuse total amount, and China in 2016 generates building rubbish
Rubbish is more than 2,000,000,000 tons, it is contemplated that arrives the year two thousand twenty end of the year, the building waste yield in China is up to peak.Wherein building waste has very big
Ratio be discarded concrete, belong to reproducible utilization material.On the other hand, add recently as modernization of the country construction process
The production of speed, China's cement remains high all the year round with consumption.According to statistics, producing ordinary portland cement per ton will discharge greatly
About 1 ton of carbon dioxide, the CO that manufacture of cement is discharged at present2Account for global CO2The 5%~7% of total release.It is following to get over
It sends out problem of environmental pollution serious and allows the public and government to have to the direction for examining conventional cement industry development closely again.
Preparing regeneration concrete using solid waste especially building waste is a kind of promising green regenerating technology.So
And it is worth mentioning that, it is directly equal using the mechanical property and durability of the regeneration concrete of construction refuse regenerated aggregate preparation
Not as good as normal concrete, so that regeneration concrete receives many limitations in practical applications.Main cause is among these: letter
Single broken obtained recycled aggregate rough surface simultaneously remains old sand slurry, due to the porosity of old sand slurry, leads to old sand slurry and bone
The interface of material and new mortar crosses that intensity is lower, to cause the decline of regeneration concrete performance.Chinese patent application
CN108975815A discloses a kind of regeneration concrete manufacture craft, has only recycled the aggregate in waste and old concrete, not
Have and sufficiently recycles waste and old concrete.
Therefore, it is necessary to develop the method that can make full use of the good regeneration concrete of waste and old concrete processability.
Summary of the invention
The present invention is to overcome the regeneration concrete performance prepared described in the above-mentioned prior art using building waste insufficient
Defect provides a kind of preparation method of regeneration concrete, and the preparation method provided can recycle the bone in waste and old concrete
Material and cement slurry, make full use of waste and old concrete, and then regeneration concrete is prepared, and obtained to regeneration concrete
It can be good, additionally it is possible to improve the resource utilization rate of building waste, reduce carbon emission, the space that release building waste is occupied.
Another object of the present invention is to provide regeneration concretes made from above-mentioned preparation method.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of preparation method of regeneration concrete, includes the following steps:
S1. waste and old concrete is broken, heat treatment；
S2. step S1. treated waste and old concrete is subjected to pulp separation, obtains aggregate and cement slurry；
S3. the obtained cement slurry of step S2. is ground, high temperature cabonization processing, obtains recycled cement；
S4. high temperature cabonization processing is carried out after aggregate screening step S2. obtained, obtains recycled aggregate；
S5. recycled aggregate, additive and the water obtained recycled cement, natural river sand, step S4. that step S3. is obtained
Mixing, obtains the regeneration concrete；
Step S3. and the temperature of step S4. high temperature carbonization are 100~600 DEG C.
After the present invention grinds the cement slurry after separation, coupled using high temperature under the conditions of 100~600 DEG C and carbonization
The method of modifying of effect strengthens it, and recycled cement is successfully made；Meanwhile by after the aggregate screening after separation, also utilize
High temperature and the method for modifying of carbonization coupling strengthen it under the conditions of 100~600 DEG C, and recycled aggregate is made；Then sharp
Regeneration concrete of good performance is successfully prepared with above-mentioned recycled cement, recycled aggregate and other concrete materials of arranging in pairs or groups.
The mix of above-mentioned regeneration concrete is functional, and mechanical property is good, and mechanical property is thick better than ordinary portland cement or naturally
Concrete made from aggregate.
Above-mentioned preparation method it is mixed can to obtain regeneration of good performance using the aggregate and cement slurry in waste and old concrete
Solidifying soil provides help to promote the application of regeneration concrete.The above method can not only effectively improve construction refuse resource benefit
With rate, carbon emission amount is reduced, alleviates the climatic issues of global warming to a certain extent, moreover it is possible to discharge the sky that building waste is occupied
Between, save valuable land resource.
Preferably, it is crushed in step S1. and is crushed using jaw crusher.Preferably, what is obtained after being crushed is waste and old mixed
Solidifying soil block is 40~80mm.
Broken waste and old concrete block is heated at high temperature in step S1., makes full use of aggregate expanded by heating, cement
The principle of moisture evaporation and contraction, initial gross separation aggregate and cement slurry in slurry.
Wherein it is heated at high temperature mechanism are as follows: 100 DEG C are warming up to from room temperature by 30min, then 100 DEG C of 120min of constant temperature, then
200 DEG C, 200 DEG C of 120min of constant temperature are warming up to by 30min, is then cooled to 100 DEG C, 100 DEG C of constant temperature by 30min
120min is finally cooled to room temperature by 30min.
The operation that pulp separates in step S2. are as follows: the waste and old concrete block after heating is poured into the stirring of 50L horizontal concrete
5min is stirred in machine, by the friction between aggregate and aggregate, the collision of aggregate and blender, thus by aggregate and cement slurry
It is separated.
The operation of grinding, high temperature cabonization processing in step S3. are as follows: collect the cement slurry separated after stirring, pass through planet
Formula ball mill grinds cement slurry, to obtain the recycled cement of different-grain diameter, using high temperature and the coupling that is carbonized
Method of modifying strengthens it.
Preferably, in step S4. after aggregate screening, further include the steps that rinsing, dry, carry out high temperature cabonization after drying again
Processing.
Preferably, step S3. and the temperature of step S4. high temperature carbonization are 200~600 DEG C.
It is highly preferred that step S3. and the temperature of step S4. high temperature carbonization are 400 DEG C.
High temperature cabonization treatment mechanism are as follows: carbonization treatment is carried out to recycled aggregate using carbonization case.Parameters in carbonization case
Are as follows: temperature (20 ± 2) DEG C, humidity (70 ± 2) DEG C, CO2Concentration 100%.When processing, the temperature of needs is set.Handle Regenerated Bone
When material: carbonization case in be put into shelf, it is contemplated that the uniformity coefficient of carbonization, using intermediate bulkhead be layered place, every layer take it is thin
Layer is placed, and aggregate place Min layers is opened on the brandreth of each layer of case of carbonization；It is regenerated in addition, being detected using 1% phenolphthalein alcoholic solution
The carbonizing degree of aggregate.When handling recycled cement: being put into iron pallet in carbonization case, it is contemplated that the uniformity coefficient of carbonization, benefit
It is layered and is placed with intermediate bulkhead, every layer is taken thin layer to place, and recycled cement place Min layers are opened in the iron support of each layer of case of carbonization
On disk；In addition, using the carbonizing degree of 1% phenolphthalein alcoholic solution detection recycled cement.
Preferably, the recycled aggregate that step S4. is obtained includes the first recycled aggregate, the second recycled aggregate and third Regenerated Bone
Material, the particle size range of first recycled aggregate, the second recycled aggregate and third recycled aggregate be respectively 0.15mm≤d≤
5mm, 5mm < d≤10mm and 10mm < d≤20mm, wherein d indicates the partial size of recycled aggregate.
Preferably, in recycled aggregate described in step S5., the mass percentage of the first recycled aggregate is 20%~40%,
The mass percentage of second recycled aggregate is 20%~40%, the mass percentage of third recycled aggregate is 20%~
40%.
Preferably, in the regeneration concrete each component mass percentage are as follows: recycled cement 14%~18%, naturally
River sand 18%~22%, recycled aggregate 48%~52%, additive 0.1%~0.3%, surplus are water.
It is highly preferred that in the regeneration concrete each component mass percentage are as follows: recycled cement 16.6%, natural river
Sand 21.7%, recycled aggregate 50.75%, additive 0.25%, surplus are water.
Preferably, the additive is calcium saccharate high efficiency water reducing agent.
Preferably, the natural river sand is the river sand that partial size is less than or equal to 5mm.The natural river sand is natural fine aggregate.
The processing step mixed in step S5. is as follows:
(1) recycled aggregate after strengthening modification, additional water is added to blender, uniform stirring 5min makes its surface
At saturated dry surface；
(2) recycled cement and natural river sand after strengthening modification, uniform stirring 5min is added to blender；
(3) Free water and additive, uniform stirring 2min is added to blender.
The preparation process of test specimen is as follows:
Then above-mentioned steps (3), then, (4) discharging enter mould, vibrate 2min on shake table (vibration frequency 50Hz)
Molding；
(5) it vibrates and test specimen is statically placed in natural curing in indoor environment after molding, the watering of mold surrounding, and with permeable cotton
Cloth covers its surface；
(6) demoulding after standing 1 day, and test specimen is placed in high-temperature steam rapid curing case and carries out high temperature steam curing
(curing temperature is 80 DEG C)；
(7) test specimen is taken out after high temperature steam curing and is placed in the standard curing of humidity >=98%, temperature equal to 20 ± 1 DEG C
Case Plays conserve 28 days, take out test specimen when formally testing, and standing 1 day spare.
Wherein high-temperature steam rapid curing case working mechanism are as follows: be warming up to 30 DEG C from room temperature by 30min, then constant temperature 30
DEG C 30min, is warming up to 80 DEG C, 80 DEG C of steam curing 1440min of constant temperature using 60min, is then cooled to 30 by 60min
DEG C, 30 DEG C of 30min of constant temperature are finally cooled to room temperature by 30min.
Regeneration concrete made from above-mentioned preparation method is also within protection scope of the present invention.
Compared with prior art, the beneficial effects of the present invention are:
Preparation method provided by the invention can recycle aggregate and cement slurry in waste and old concrete, make full use of
Waste and old concrete, and then regeneration concrete is prepared, and obtained functional to regeneration concrete, coagulation is regenerated to promote
The application of soil provides help, moreover it is possible to effectively improve construction refuse resource utilization rate, reduce carbon emission amount, delay to a certain extent
Solve the climatic issues of global warming, moreover it is possible to discharge the space that building waste is occupied, save valuable land resource.
Detailed description of the invention
Fig. 1 is the process flow diagram that the present invention prepares recycled cement.
Fig. 2 is the process flow diagram that the present invention prepares recycled aggregate.
Fig. 3 is the process flow diagram that the present invention prepares regeneration concrete and test specimen.
Fig. 4 is the slump of the concrete of Examples 1 to 4 and comparative example 1~4.
Fig. 5 is the setting time of the concrete of Examples 1 to 4 and comparative example 1~4.
Fig. 6 is the compression strength of the concrete sample of Examples 1 to 4 and comparative example 1~4.
Specific embodiment
The present invention is further illustrated With reference to embodiment.
Raw material in embodiment can be by being commercially available；Cement grade in embodiment is stone well board 42.5R grade
Ordinary portland cement.
Unless stated otherwise, the present invention uses reagent, method and apparatus for the art conventional reagent, method and are set
It is standby.
Embodiment 1
A kind of preparation method of regeneration concrete includes the following steps: as shown in Figures 1 to 3
S1. waste and old concrete is broken, heat treatment；It is crushed in step S1. and is crushed using jaw crusher；, break
The waste and old concrete block obtained after broken is 40~80mm；Broken waste and old concrete block is heated at high temperature in step S1.,
Make full use of aggregate expanded by heating, moisture evaporation and the principle shunk, initial gross separation aggregate and cement slurry in cement slurry；It is high
Warm heating mechanism are as follows: be warming up to 100 DEG C from room temperature by 30min, then 100 DEG C of 120min of constant temperature, are warming up to using 30min
200 DEG C, 200 DEG C of 120min of constant temperature, 100 DEG C, 100 DEG C of 120min of constant temperature then are cooled to by 30min, finally passes through 30min
It is cooled to room temperature；
S2. step S1. treated waste and old concrete is subjected to pulp separation, obtains aggregate and cement slurry；Step S2.
The operation of middle pulp separation are as follows: the waste and old concrete block after heating is poured into 50L horizontal concrete mixer and stirs 5min, is led to
The friction between aggregate and aggregate, the collision of aggregate and blender are crossed, so that aggregate be separated with cement slurry；
S3. the obtained cement slurry of step S2. is ground, high temperature cabonization processing, obtains recycled cement；Step S3.
The operation that middle grinding, high temperature cabonization are handled are as follows: the cement slurry separated after stirring is collected, by planetary ball mill to cement slurry
Body is ground, and to obtain the recycled cement of different-grain diameter, is carried out using the method for modifying of high temperature and carbonization coupling to it
Strengthen；It is carbonized using carbonization case, in the present embodiment, humidity (70 ± 2) DEG C, CO2Concentration 100%, temperature are 100 DEG C, when
Between be 1 day, standing is taken out after processing and is cooled to room temperature；
S4. high temperature cabonization processing is carried out after aggregate screening step S2. obtained, obtains recycled aggregate；Step
S4. the particle size range obtained is respectively 0.15mm≤d≤5mm, 5mm < d≤10mm and 10mm < d≤20mm
The first recycled aggregate, the second recycled aggregate and third recycled aggregate.The operation of high temperature cabonization processing are as follows: carried out using carbonization case
It is carbonized, in the present embodiment, humidity (70 ± 2) DEG C, CO2Concentration 100%, temperature are 100 DEG C, and the time is 1 day, are taken out after processing quiet
It sets and is cooled to room temperature.
S5. recycled aggregate, additive and the water obtained recycled cement, natural river sand, step S4. that step S3. is obtained
Mixing, obtains the regeneration concrete；In the recycled aggregate of step S5., the mass percentage of the first recycled aggregate is
23.55%, the mass percentage of the second recycled aggregate is 36.78%, and the mass percentage of third recycled aggregate is
39.67%；The processing step mixed in rapid S5. is as follows: (1) to blender it is added recycled aggregate strengthen modification after, it is attached
Add water, uniform stirring 5min makes its surface at saturated dry surface；(2) regeneration after strengthening modification is added to blender
Cement and natural river sand, uniform stirring 5min；(3) Free water and additive, uniform stirring 2min is added to blender.
Next test specimen is prepared:
(4) it discharges, enter mould, 2min molding is vibrated on shake table (vibration frequency 50Hz)；(5) vibrating will examination after forming
Part is statically placed in natural curing in indoor environment, the watering of mold surrounding, and covers its surface with permeable cotton；(6) after standing 1 day
Demoulding, and test specimen is placed in high-temperature steam rapid curing case and carries out high temperature steam curing (curing temperature is 80 DEG C)；(7) high
Test specimen is taken out after warm steam curing and is placed in the standard curing box Plays maintenance of humidity >=98%, temperature equal to 20 ± 1 DEG C
28 days, test specimen is taken out when formally testing, standing 1 day spare；High-temperature steam rapid curing case working mechanism are as follows: passed through from room temperature
It crosses 30min and is warming up to 30 DEG C, then 30 DEG C of 30min of constant temperature, be warming up to 80 DEG C using 60min, 80 DEG C of steam curings of constant temperature
Then 1440min is cooled to 30 DEG C, 30 DEG C of 30min of constant temperature by 60min, be finally cooled to room temperature by 30min.Test specimen ruler
It is very little: 150mm × 150mm × 150mm cube specimen.
The dosage of each component is as shown in table 1 in the regeneration concrete of the present embodiment.The partial size of natural river sand is less than or equal to
5mm, as natural fine aggregate.Additive is using calcium saccharate as water-reducing agent.
Embodiment 2
The present embodiment is the second embodiment of regeneration concrete of the present invention, the carbonization of the present embodiment different from embodiment 1
Temperature is 200 DEG C；
Other raw materials and operating procedure are same as Example 1.
Embodiment 3
The present embodiment is the second embodiment of regeneration concrete of the present invention, the carbonization of the present embodiment different from embodiment 1
Temperature is 400 DEG C；
Other raw materials and operating procedure are same as Example 1.
Embodiment 4
The present embodiment is the second embodiment of regeneration concrete of the present invention, the carbonization of the present embodiment different from embodiment 1
Temperature is 600 DEG C；
Other raw materials and operating procedure are same as Example 1.
Comparative example 1
Unlike the first embodiment, this comparative example substitutes 50% recycled water using ordinary portland cement to this comparative example
Mud, specific raw material dosage are as shown in table 1；
Other operating procedures are same as Example 1.
Comparative example 2
Unlike the first embodiment, this comparative example substitutes recycled cement using ordinary portland cement to this comparative example, specifically
Raw material dosage is as shown in table 1；
Other operating procedures are same as Example 1.
Comparative example 3
Unlike the first embodiment, this comparative example has this comparative example using the recycled aggregate of natural coarse aggregate substitution 50%
Body raw material dosage is as shown in table 1；
Other operating procedures are same as Example 1.
Comparative example 4
Unlike the first embodiment, this comparative example substitutes recycled aggregate, specific raw material using natural coarse aggregate to this comparative example
Dosage is as shown in table 1；
Other operating procedures are same as Example 1.
Dosage (the units/kg/m of each raw material in 1 Examples 1 to 4 of table and comparative example 1~43)
The basic performance indices of natural coarse aggregate in 2 comparative example 1~4 of table
Test method
1. concrete mixture characteristic
It is tested according to " Standard for test methods of properties of ordinary concrete mixture standard GB50080-2002 ", specifically, mixed
Solidifying soil mixture consistency is measured using slump method；Concrete mix setting time is surveyed using penetration resistance method
It is fixed.
2. mechanical performance of concrete
According to " standard for test methods of mechanical properties of ordinary concrete GBT50081-2002 ", all test specimens are all made of
MATEST resistance to compression (hydraulic) testing machine implements uniaxial compression load measurement cubic compressive strength.
Experimental result
Shown in the performance test results of Examples 1 to 4 and comparative example 1~4 such as table 3 and Fig. 4~6.
The major influence factors of Examples 1 to 4 are temperature, and at 100 DEG C to 600 DEG C, regeneration concrete is functional, collapses
Degree of falling is distributed between 235~255mm, and uniformly, mobility, water-retaining property are good for extension, and furthermore cohesiveness also meets experiment and wants
It asks.In terms of setting time, more common regeneration concrete setting time is shortened, and as the temperature increases, when condensation
Between be in entire lowering trend.And the performance in terms of mechanical property, we can be clearly seen by Fig. 6, with temperature
Increase, the rule of first increases and then decreases is presented in concrete 28d compression strength, and maximum value appears near 400 DEG C.It is existing to there is this
As the reason is that cracking phenomena easily occurs for recycled aggregate aggregate when more than 400 DEG C, inside generates many smile cracks, strength reduction
And then influence regeneration concrete integral strength.
The major influence factors of comparative example 1~2 are Replacement rate of the ordinary portland cement to recycled cement, in Replacement rate
0%, under 50%, 100% 3 variable, the slump is in 160mm or so, and when Replacement rate increases, the slump is in downward trend,
Comparative example 2 is compared with the decline of comparative example 1 about 3.13%, we are from the slope of curve it is recognised that Replacement rate influences less, no the slump
It is major influence factors.In terms of setting time, extended compared with Examples 1 to 4 setting time, and with the increasing of Replacement rate
Add, setting time is in the trend to rise overally.And the performance in terms of mechanical property, we can be clearly seen by Fig. 6,
With the increase of Replacement rate, downward trend is presented in concrete 28d compression strength.There is this phenomenon reason to be primarily due to regenerate
Cement is by high temperature and is carbonized under coupling, extraneous CO2Entered in hole by the pore of hardened cement paste, and it is molten
Hydrolysis product of cement reaction of the solution in Pore Solution, generates calcium carbonate (CaCO3) and silica gel, increase it and adheres to the close of cement slurry
Reality reduces its porosity, to improve the performance of recycled cement.Wherein (following formulas is only as follows for carbonation reaction
The variation for indicating reaction process front and back reactant, you need to add is that C-S-H is Ca (OH)2, SiO2And H2The water that O reaction generates
Change product):
Ca(OH)2+CO2→CaCO3+H2O
V-S-H+CO2→CaCO3→SiO2·nH2O
The major influence factors of comparative example 3~4 are Replacement rate of the common recycled aggregate to intensifying regenerating aggregate, in Replacement rate
0%, under 50%, 100% 3 variable, the slump is in 215mm or so, and when Replacement rate increases, the slump is in downward trend,
Comparative example 4 is compared with the decline of comparative example 3 about 3.13%, we are from the slope of curve it is recognised that Replacement rate influences less, no the slump
It is major influence factors.In terms of setting time, it is not much different compared with Examples 1 to 4 setting time, and with Replacement rate
Increase, setting time is in the trend that rises overally.And the performance in terms of mechanical property, we can be by Fig. 6 clearly
See, with the increase of Replacement rate, downward trend is presented in concrete 28d compression strength.Occur this phenomenon reason be mainly because
For recycled aggregate by high temperature and carbonization coupling under, make aggregate surface temperature increase and internal temperature is very low, inside and outside formation
Temperature difference；External old sand slurry is since high temperature action intensity declines, and internal natural aggregate forms very high temperature stress again, thus
Lead to falling off for external mortar, along with the rapid cooling after heating so that the inside and outside secondary temperature of generation of recycled aggregate is answered
Power accelerates the destruction of external old sand slurry, to strengthen aggregate.In addition contain unhydrated water in recycled aggregate surface layer attachment old mortar
Mud particle, Minerals energy and CO2Carburizing reagent occurs, to improve the performance of recycled aggregate.Wherein carburizing reagent equation
It is as follows:
2CaO·SiO2+2CO2+μH2O→2CaCO3+SiO2·μH2O
3CaO·SiO2+3CO2+μH2O→3CaCO3+SiO·μH2O
The performance test results of 3 Examples 1 to 4 of table and comparative example 1~4
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (8)
1. a kind of preparation method of regeneration concrete, which comprises the steps of:
S1. waste and old concrete is broken, heat treatment；
S2. step S1. treated waste and old concrete is subjected to pulp separation, obtains aggregate and cement slurry；
S3. the obtained cement slurry of step S2. is ground, high temperature cabonization processing, obtains recycled cement；
S4. high temperature cabonization processing is carried out after aggregate screening step S2. obtained, obtains recycled aggregate；
S5. recycled aggregate, additive and the water mixing obtained recycled cement, natural river sand, step S4. that step S3. is obtained,
Obtain the regeneration concrete；
Step S3. and the temperature of step S4. high temperature carbonization are 100~600 DEG C.
2. preparation method according to claim 1, which is characterized in that the temperature of step S3. and the carbonization of step S4. high temperature
It is 200~600 DEG C.
3. preparation method according to claim 3, which is characterized in that the temperature of step S3. and the carbonization of step S4. high temperature
It is 400 DEG C.
4. preparation method according to claim 1, which is characterized in that the recycled aggregate that step S4. is obtained includes first again
Raw aggregate, the second recycled aggregate and third recycled aggregate, first recycled aggregate, the second recycled aggregate and third recycled aggregate
Particle size range be respectively 0.15mm≤d≤5mm, 5mm < d≤10mm and 10mm < d≤20mm, wherein d indicates regeneration
The partial size of aggregate.
5. the preparation method according to claim 4, which is characterized in that in recycled aggregate described in step S5., the first Regenerated Bone
The mass percentage of material is 20%~40%, and the mass percentage of the second recycled aggregate is 20%~40%, third regeneration
The mass percentage of aggregate is 20%~40%.
6. described in any item preparation methods according to claim 1~5, which is characterized in that each component in the regeneration concrete
Mass percentage are as follows: recycled cement 14%~18%, natural river sand 18%~22%, recycled aggregate 48%~52%, outside
Add agent 0.1%~0.3%, surplus is water.
7. preparation method according to claim 6, which is characterized in that the quality percentage of each component in the regeneration concrete
Content are as follows: recycled cement 16.6%, natural river sand 21.7%, recycled aggregate 50.75%, additive 0.25%, surplus are water.
8. regeneration concrete made from any one of claim 1~7 preparation method.
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| CN112390582A (en) * | 2020-12-05 | 2021-02-23 | 郴州中祁工程材料有限公司 | Concrete using recycled concrete aggregate and preparation method thereof |
| CN112745075A (en) * | 2020-12-31 | 2021-05-04 | 南通友力混凝土有限公司 | Corrosion-resistant recycled concrete and production process thereof |
| CN113754324A (en) * | 2021-09-27 | 2021-12-07 | 清华大学 | Preparation method and application of regenerated cement based on high temperature and carbonization coupling |
| CN115180854A (en) * | 2022-05-30 | 2022-10-14 | 湖北工业大学 | Preparation and application method of carbon-fixing type commercial concrete waste slurry |
| CN115215571A (en) * | 2022-05-30 | 2022-10-21 | 湖北工业大学 | Carbon fixation treatment and recycling method for commercial mixed solid waste |
| CN115215571B (en) * | 2022-05-30 | 2023-10-13 | 湖北工业大学 | Commercial mixed solid waste carbon fixation treatment and recycling method |
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