CN111116167A - Composition for preparing cold bonding artificial aggregate and prepared cold bonding artificial aggregate - Google Patents
Composition for preparing cold bonding artificial aggregate and prepared cold bonding artificial aggregate Download PDFInfo
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- CN111116167A CN111116167A CN201811277646.9A CN201811277646A CN111116167A CN 111116167 A CN111116167 A CN 111116167A CN 201811277646 A CN201811277646 A CN 201811277646A CN 111116167 A CN111116167 A CN 111116167A
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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
- C04B30/00—Compositions for artificial stone, not containing binders
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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
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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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
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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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
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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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The present invention provides a composition for preparing cold-bonded artificial aggregate, which comprises common solid waste cement concrete mortar and waste incineration slag as constituent components. The invention also provides cold bonding artificial aggregate prepared from the composition and a preparation method thereof. The cold bonding artificial aggregate provided by the invention has the advantages of high utilization rate of industrial solid waste, good performance and the like, the production process has feasibility of industrial popularization, the concepts of environmental protection and resource recycling are greatly promoted, and the cold bonding artificial aggregate has good application prospect.
Description
Technical Field
The invention relates to the technical field of resource recycling, in particular to a composition for preparing cold bonding artificial aggregate and the prepared cold bonding artificial aggregate.
Background
Human beings produce a series of corresponding solid wastes in production, life and other activities, including industrial waste residues, sludge, tailings and the like, and domestic garbage, construction garbage and the like produced in urban life. These solid wastes are polluting and improper disposal causes secondary pollution to the environment. However, under the conditions of proper treatment and comprehensive utilization, the wastes have certain resource value and economic value. At present, the treatment and reuse of solid waste have been widely regarded.
The municipal solid waste incineration technology has been widely adopted as an effective waste treatment method, and the treatment of the corresponding generated waste incineration slag (IBA) is a new problem to be solved urgently. In china, there were about 249 municipal solid waste incineration plants for harmless treatment in 2016, with a daily garbage disposal of 255850 tons, which means that about 51170 tons of slag are produced per day, which are sent to landfills after screening and demetallization. In europe, the waste incineration slag is screened and subjected to corresponding purification treatment (water washing, etc.), the coarse particles (more than 5 mm) of which can be used in the roadbed base layer, and the fine particles (less than 5 mm) of which are generally directly buried or buried after solidification because of relatively high contents of impurities and pollutant components and insignificant effects of the conventional purification treatment method. Therefore, the fine waste incineration slag needs innovative treatment method to convert it into usable renewable resources so as to reduce the landfill and secondary pollution. Hong Kong will be built and operated a waste incineration plant in 2024 years, the waste treatment capacity is 3000 tons/day, and the disposal of waste incineration slag at that time will be a major problem facing hong Kong.
With the development of the construction industry and the increasing emphasis on environmental protection, commercial concrete has become a main way of supplying concrete in urban construction. In the process of production and transportation application, a series of cement concrete wastes generated by cleaning transportation equipment and producing excessive or substandard concrete, in particular cement Concrete Slurry (CSW) in a sedimentation tank of a cement concrete mixing plant, become a new problem to be solved urgently. Taking hong Kong as an example, due to the cleaning of a transport tanker, the return transportation of redundant fresh concrete and the like, cement concrete waste which can be produced by a concrete mixing plant is about 1.5 percent of the constant of the total commercial concrete, sand and stone in the cement concrete waste are separated and recycled after passing through a screening device, the separated cement paste is precipitated in a precipitation tank and is separated into solid and liquid through an extrusion device, and the total amount of the mortar in the precipitation tank of the separated cement concrete mixing plant exceeds 0.5 percent of the usage amount of the commercial concrete. In hong Kong, the separated mortar solids in the settling pond of the cement concrete mixing plant are generally directly disposed of in landfills.
The waste incineration slag and the cement concrete waste are effectively recycled and reused, which is not only beneficial to environmental protection, but also can generate great economic and social benefits.
Disclosure of Invention
In order to reduce the problems of environmental pollution, resource waste and the like caused by landfill of waste incineration slag and cement concrete waste, the invention aims to provide a composition for preparing cold bonding artificial aggregate.
It is another object of the present invention to provide a cold-bonded artificial aggregate.
The composition for preparing the cold bonding artificial aggregate can comprise 1 part of cement concrete mortar and 0.5-3 parts of waste incineration slag according to parts by weight.
Preferably, the composition for preparing the cold bonding artificial aggregate provided by the invention comprises 1 part of cement concrete mortar and 0.8-1.5 parts of waste incineration slag according to parts by weight.
More preferably, the composition for preparing the cold bonding artificial aggregate provided by the invention comprises 1 part of cement concrete mortar and 1.0-1.5 parts of waste incineration slag according to parts by weight.
In the composition provided by the invention, the waste incineration slag can comprise slag obtained after waste incineration and other solid particles (such as fly ash, boiler ash and the like) generated in the waste incineration process, and the main oxidation component of the waste incineration slag comprises SiO2、CaO、Al2O3、Fe2O3、P2O5、Na2O、SO3、MgO、K2O, and the like. The particle size of the waste incineration slag can be less than 5.0mm, preferably less than 2.36mm, the waste incineration slag can be obtained by particle size screening, larger slag can also be obtained after crushing, the waste incineration slag does not need to be dried in advance during screening, and the slag obtained by screening can be stored in a sealing way or can be stored in the open air. The water content of the waste incineration slag can be 0-40 wt%, and preferably 15-20 wt%.
In the composition provided by the invention, the cement concrete mortar can be a sedimentation tank mortar of an unhardened cement concrete mixing plant, and the main oxidation components of the cement concrete mortar comprise CaO and SiO2、Al2O3、Fe2O3、SO3、MgO、K2O, and the like. The settler mortar obtained from a cement concrete mixing plant is usually a wet mass and, after uniform mixing, the cement concrete mortar for use in the composition of the invention is produced. The water content of the cement concrete mortar may be 40 to 60 wt%, preferably 45 to 50 wt%.
In the composition provided by the invention, according to the performance requirements (such as strength and the like) of the cold bonding artificial aggregate, a cementing material can be added, and the weight of the cementing material can be not more than 20 wt% of the total weight of the cement concrete mortar and the waste incineration slag; preferably, the amount of the cement concrete mortar is 5 to 10 wt% based on the total weight of the cement concrete mortar and the waste incineration slag. Types of cementitious materials include, but are not limited to, portland cement, granulated blast furnace slag powder, quicklime, silica fume, fly ash, and other hydraulic cementitious materials.
The cold-bonded artificial aggregate provided by the invention can be prepared from the composition of any one of the technical schemes.
In the cold bonding artificial aggregate provided by the invention, the preparation process can comprise the following steps:
s1: collecting cement concrete mortar, optionally adding a cementing material into the cement concrete mortar, and collecting waste incineration slag;
s2: uniformly mixing the cement concrete mortar obtained in the step S1 with the waste incineration slag to prepare a mixed material;
s3: carrying out disc granulation on the mixed material obtained in the step S2 to prepare aggregate particles; and
s4: and (5) curing the aggregate particles obtained in the step (S3) to obtain the cold bonding artificial aggregate.
In step S1, the collection process of the cement concrete mortar and the waste incineration slag is not limited to be performed in sequence, and may be performed simultaneously, or the cement concrete mortar may be collected first (including the addition of the cementitious material), then the waste incineration slag may be collected (including the screening of the particle size), and then the cement concrete mortar may be collected first (including the screening of the particle size), and then the cement concrete mortar may be collected (including the addition of the cementitious material).
In the step S2, any stirring method can be used in the process of uniformly mixing the cement concrete mortar and the waste incineration slag, and the stirring time can be determined according to the actual preparation conditions, and the materials can be uniformly mixed.
In the step S3, the aggregate particles may be prepared by using an existing disc granulation apparatus, and the diameter, rotation speed, angle, time, feeding amount, etc. of the disc granulation apparatus may be determined according to actual preparation conditions, for example, the disc angle of the disc granulation apparatus may be controlled to 40 to 50 °, and the granulation time may be controlled to 6 to 15 minutes, for example. The additional water spray during granulation depends on the water content of the feed. The moisture content of the aggregate particles prepared in step S3 is preferably controlled to 20-25 wt%.
In the step S4, the curing method of the aggregate particles may be an existing artificial aggregate curing method or a combination thereof. Preferably, the curing manner in step S4 may be: drying and curing for 12-36 hours at a relative humidity of 20-80%, and then curing by one or more of the following modes: humidity sealing maintenance, steam maintenance or carbon dioxide maintenance.
The humidity sealing maintenance performed in step S4 first can make the aggregate have preliminary strength, so as to facilitate the further maintenance and transfer during storage of the aggregate; the preferred relative humidity can be 60-80%, and the temperature can be room temperature.
The subsequent curing process of step S4 may be performed by selecting or adjusting curing conditions according to actual preparation conditions, economic and environmental factors, performance requirements of artificial aggregates, and the like. For example, the humidity sealing and curing can be performed at room temperature for 25 to 35 days at a relative humidity of 60 to 80%. For example, the steam curing may be performed at 50 to 90 ℃ for 1 to 10 days. For another example, the carbon dioxide curing may be carbon dioxide flow curing or pressure curing, and the curing time may be 12 to 36 hours.
The preferred curing method in step S4 may be carbon dioxide curing, which may be of any source, and the carbon dioxide used in the present invention is preferably derived from landfill gas, industrial off-gas or collected carbon dioxide, more preferably landfill gas or fossil fuel-derived industrial off-gas. The volume concentration of carbon dioxide may be 10 to 100% (v/v); preferably, the concentration of the surfactant is 10 to 60% (v/v).
In order to facilitate carbon dioxide curing, the aggregate particles can be subjected to pre-drying treatment, preferably pre-drying for 12-36 hours at a relative humidity of 40-60% to dissipate moisture, and the water content of the aggregate particles before carbonization is preferably lower than 10 wt%. The pre-dried aggregate particles can be placed in a carbon dioxide curing container, flowing carbon dioxide gas can circulate in the container, dehumidifying equipment or drying agents can be supplemented in the container so as to discharge water vapor released by carbonization reaction in time, and the relative humidity in the container can be maintained between 45% and 85%, preferably between 45% and 60% in the circulating curing process. And pressurizing equipment can be supplemented in the carbon dioxide curing process, so that the pressure in the container is maintained to be about 0.1-1 bar, the carbonization reaction is accelerated, and in the pressurizing curing process, the relative humidity in the container does not need to be maintained, and the relative humidity which is the same as or similar to that in the circulating curing process can be maintained.
In the cold bonding artificial aggregate provided by the invention, the particle size of the aggregate can be selected according to actual use requirements, or can be selected according to the particle size range of common artificial aggregates. For example, the particle size of the prepared cold bonding artificial aggregate can be 5-14mm, and the part of the prepared cold bonding artificial aggregate accounts for more than 60% of the total mass; it may preferably account for 80% or more of the total mass.
The cold bonding artificial aggregate prepared by the invention can have different performances according to different preparation processes, so that the cold bonding artificial aggregate can be applied to various fields or occasions, can replace the existing concrete aggregates such as natural aggregate, sintered ceramsite light aggregate and the like, and can also be mixed with the existing aggregates for use; preferably, the cold-bonded artificial aggregate provided by the present invention may be a lightweight aggregate, which complies with the specifications for the loose bulk density of lightweight aggregates in astm C330, C331, C332.
The composition and the cold bonding artificial aggregate prepared from the composition have the following advantages:
(1) the cement concrete mortar is used as a raw material, so that the cement concrete mortar can be changed into a value-added material from wastes without landfill treatment, and the waste incineration slag is used as the raw material to replace the original landfill treatment.
(2) The cold bonding artificial aggregate can be adjusted through a preparation process, an addition material and the like to obtain aggregate products with various and multiple performance requirements, and the preparation process is simple, convenient and feasible and is beneficial to large-scale production.
(3) The cold bonding artificial aggregate can be cured by utilizing carbon dioxide waste gas, can accelerate the carbonization of materials, has quick increase of the strength of the aggregate and short curing time, can also enhance certain properties of the aggregate, can also reduce the emission of domestic and industrial waste gas, saves energy and further lightens the environmental burden.
In conclusion, the cold bonding artificial aggregate has the advantages of high utilization rate of industrial solid wastes, good performance and the like, the production process has feasibility of industrial popularization, greatly promotes concepts of environmental protection and resource recycling, and has good application prospect.
Drawings
FIG. 1 is a flow chart of the preparation process of the cold-bonded artificial aggregate of the present invention.
FIG. 2A is a graph showing the results of a loose bulk density test of batches of artificial aggregate prepared in example 1.
FIG. 2B is a graph showing the results of particle strength and barrel crush strength tests on batches of artificial aggregate prepared in example 1.
Fig. 2C is a graph showing the results of water absorption tests of batches of artificial aggregate prepared in example 1.
FIG. 3 is a schematic view showing the structure of an apparatus for curing artificial aggregates under carbon dioxide in example 2.
FIG. 4A is a graph showing the results of a loose bulk density test of batches of artificial aggregate prepared in example 2.
Fig. 4B is a graph showing the water absorption test result of each batch of artificial aggregate prepared in example 2.
FIG. 4C is a graph showing the results of a particle strength test of each batch of artificial aggregate prepared in example 2.
Wherein the reference numerals are as follows:
1. artificial aggregate; 2. maintaining the container; 3. a humidity adjusting device; 4. and a control device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, technical solutions of exemplary embodiments of the present invention will be further described below.
The cement concrete mortar used in the following examples was a settling tank mortar collected from a cement concrete mixing plant and having a water content of about 50% by weight; the water content of the waste incineration slag used for the following is 15-20 wt%.
Example 1
The preparation process is shown in figure 1.
Step 1: screening the waste incineration slag to select a part with the grain diameter of less than 2.36mm, stirring the cement concrete mortar to form uniform slurry, and adding an optional cementing material into the slurry. The kinds and amounts of the refuse incineration slag, cement concrete mortar and cement material are shown in Table 1.
TABLE 1
In Table 1, the cement is Portland cement No. 52.5, and the granulated blast furnace slag powder meets the GB/T203 standard.
Step 2: mixing and stirring the waste incineration slag, the cement concrete mortar and the optional cementing material uniformly.
And step 3: granulating by a disk granulator to obtain aggregate particles with the particle size of 2.36-16mm, wherein 80 wt% of the aggregate particles have the particle size of 5-14 mm.
And 4, step 4: sealing the prepared artificial aggregate particles in a sealed bag, and placing the sealed bag in an environment with the relative humidity of 75% for curing for 28 days to obtain the final cold bonding artificial aggregate.
Performance testing
The loose bulk density of the aggregate was tested according to ASTM C29, the strength of the aggregate according to EN13055-1 and the water absorption of the aggregate. Before testing, all aggregates were dried in an oven at a temperature of 105 °.
The results of the loose bulk density test are shown in FIG. 2A, which shows that the loose bulk density of all the batches of cold-bonded artificial aggregates prepared in example 1 is 760-850kg/m3All of them meet the requirements of ASTM C330, C331 and C332 on loose bulk density of lightweight aggregate (less than 880 kg/m)3). The cold-bonded artificial aggregate thus prepared can be classified as a lightweight aggregate.
The results of the strength test are shown in FIG. 2B, which shows that all the batches of cold-bonded artificial aggregates prepared in example 1 have very good strength, especially when other cementing materials are added into the cold-bonded artificial aggregates prepared in example 1 (5% -10%), the cylinder pressure strength of the aggregates is measured to be 6.5-8.25MPa, which is greater than that of the sintered ceramsite lightweight aggregates produced industrially (the laboratory test value is 6.5MPa under the same conditions).
The water absorption test results are shown in fig. 2C, which shows that all batches of the cold-bonded artificial aggregate prepared in example 1 have a water absorption of 19-24% at 24 hours.
It can also be seen from fig. 2A-2C that as the content of the doped cementitious material increases, the loose bulk density of the prepared cold-bonded artificial aggregate increases, the strength of the aggregate increases, and the water absorption decreases, so that the performance of the obtained artificial aggregate can be adjusted according to actual needs, and then various artificial aggregates with different performances can be obtained.
Example 2
Artificial aggregate was prepared according to the raw material mixing ratio in Table 2, and the procedures 1 to 3 were the same as in example 1.
TABLE 2
The samples with the two raw materials in the mixing ratio are prepared into two batches respectively, and the content of the components with the grain diameter of 5-10mm in the batch 1 is controlled to be 60 percent and the content of the components with the grain diameter of 10-14mm in the batch 2 is controlled to be 60 percent respectively through the water adding amount in the granulation process.
After the two batches of samples prepared above were subjected to preliminary humidity curing for 24 hours (sealed curing in an environment with a relative humidity of 75%), artificial aggregate curing was performed according to the curing methods listed in table 3.
TABLE 3
When carbon dioxide is used for curing, the sample is firstly put into a drying box with the relative humidity of 50 percent and the temperature of 23 ℃ and the air circulation is carried out for pre-drying for 24 hours.
For the sample cured by circulating carbon dioxide gas, as shown in fig. 3, the artificial aggregate 1 is placed in the curing container 2, carbon dioxide flows in from one side of the curing container at a constant speed and flows out from the other side of the curing container for recycling, and meanwhile, the relative humidity in the curing container 2 can be adjusted by the humidity adjusting device 3. The flow rate of carbon dioxide was controlled to 2.5 liters/minute, and the flow rate was controlled by the control device 4.
For a sample cured by pressurized carbon dioxide, putting the pre-dried artificial aggregate into a carbon dioxide curing container, vacuumizing to-0.8 bar, and filling carbon dioxide gas until the internal pressure of the curing container is 0.1bar or 1bar, and curing the aggregate.
Performance testing
The loose bulk density, water absorption and particle strength of the artificial aggregate obtained after curing were measured in the same manner as in example 1.
The results of the loose bulk density test are shown in FIG. 4A, where (a) shows that the aggregates of batch 1 of example 2 all have a loose bulk density of less than 880kg/m3These cold-bonded artificial aggregates can be classified as lightweight aggregates, in accordance with the specifications for the loose bulk density of lightweight aggregates in ASTM C330, C331, C332.
(b) The figure shows that the aggregate cured with carbon dioxide has a bulk density which is higher than that of the aggregate cured with other curing means (e.g. steam curing), and the bulk density of the aggregate cured with carbon dioxide in batch 2 is 885-910kg/m3Which exceeds 880kg/m specified for the loose bulk density of the lightweight aggregate in ASTM C330, C331, C3323But the overshoot amplitude is very small (less than 3%). The aggregate obtained in the process can be used as a whole or partial substitute of natural aggregate, and the loose bulk density can be reduced by controlling the process conditions such as time in the granulation process, so that the aggregate meets the requirements of lightweight aggregate.
The results of the water absorption test are shown in FIG. 4B, wherein (a) and (B) show that the artificial aggregate prepared in example 2 has water absorption of 23-27% (batch 1) and 17.5-21.5% (batch 2), and the water absorption of the sample cured with carbon dioxide is lower than that of the artificial aggregate of other curing methods.
The results of the particle strength test are shown in fig. 4C, wherein (a) the graph shows that the particle strength of the aggregate cured by flowing carbon dioxide for 24 hours in the aggregate of batch 1 in example 2 can reach 30% (CSW sample) and 60% (10G sample) of the particle strength of the aggregate cured by humidity for 28 days, which indicates that the carbon dioxide curing method can rapidly improve the strength of the aggregate particles, thereby facilitating the storage and movement of the aggregate particles during the curing process.
(b) The figure shows that in the aggregate of batch 2 in example 2, the particle strength of the aggregate cured by carbon dioxide for 24 hours can reach 78-86% of that of the aggregate cured by steam at 60 ℃. Under the condition of pressurized carbon dioxide curing, the particle strength of the aggregate is improved by 3-10% compared with the curing of circulating carbon dioxide.
In the aggregate cured by the carbon dioxide, the absorption capacity of the aggregate to the carbon dioxide can reach 1.2-4.5%.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (12)
1. The composition for preparing the cold bonding artificial aggregate is characterized by comprising 1 part of cement concrete mortar and 0.5-3 parts of waste incineration slag in parts by weight.
2. The composition according to claim 1, wherein the composition comprises 1 part by weight of cement concrete mortar and 0.8 to 1.5 parts by weight of waste incineration slag.
3. The composition according to claim 1 or 2, wherein the refuse incineration slag has a particle size of 5.0mm or less, preferably 2.36mm or less, and a water content of 0 to 40 wt%, preferably 15 to 20 wt%.
4. The composition according to claim 1 or 2, wherein the cement concrete mortar is a settling pond mortar of an unhardened cement concrete mixing plant, having a water content of 40 to 60 wt.%, preferably 45 to 50 wt.%.
5. The composition according to any one of claims 1 to 4, wherein the composition further comprises a cementitious material, the weight of the cementitious material being not more than 20% of the total weight of the cement concrete mortar and the waste incineration slag; preferably, the weight of the cementing material is 5-10% of the total weight of the cement concrete mortar and the waste incineration slag.
6. The composition of claim 5, wherein the cementitious material is one or more of cement, granulated blast furnace slag powder, quicklime, silica fume, fly ash.
7. A cold-bonded artificial aggregate, prepared from the composition of any one of claims 1 to 6.
8. A cold-bonded artificial aggregate according to claim 7, wherein the preparation process comprises the steps of:
s1: collecting cement concrete mortar, optionally adding a cementing material into the cement concrete mortar, and collecting waste incineration slag;
s2: uniformly mixing the cement concrete mortar obtained in the step S1 with the waste incineration slag to prepare a mixed material;
s3: carrying out disc granulation on the mixed material obtained in the step S2 to prepare aggregate particles; and
s4: and (5) curing the aggregate particles obtained in the step (S3) to obtain the cold bonding artificial aggregate.
9. The cold-bonded artificial aggregate according to claim 8, wherein the curing in step S4 is performed by curing at a relative humidity of 20-80% for 12-36 hours, and then curing is performed by one or more of the following methods: humidity sealing maintenance, steam maintenance or carbon dioxide maintenance.
10. The cold-bonded artificial aggregate according to claim 9, wherein the carbon dioxide curing is flow curing or pressure curing of carbon dioxide, and the carbon dioxide is landfill gas or industrial tail gas, and the volume concentration of the carbon dioxide is 10-100% (v/v).
11. The cold-bonded artificial aggregate according to claim 10, wherein the aggregate particles are pre-dried at a relative humidity of 40 to 60% for 12 to 36 hours before curing with carbon dioxide.
12. A cold-bonded artificial aggregate according to any one of claims 7 to 11, wherein the cold-bonded artificial aggregate is a lightweight aggregate.
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| CN201811277646.9A CN111116167A (en) | 2018-10-30 | 2018-10-30 | Composition for preparing cold bonding artificial aggregate and prepared cold bonding artificial aggregate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142395A (en) * | 2020-08-27 | 2020-12-29 | 扬州大学 | Cement-stabilized macadam mixture doped with waste incineration slag |
| CN112694279A (en) * | 2021-01-05 | 2021-04-23 | 广东科学技术职业学院 | Lightweight aggregate with core-shell structure and preparation method thereof |
| CN113620630A (en) * | 2021-07-16 | 2021-11-09 | 中国科学院武汉岩土力学研究所 | Method for preparing building aggregate from household garbage incinerator slag |
| CN113800830A (en) * | 2021-09-10 | 2021-12-17 | 深圳大学 | Artificial aggregate based on polypropylene fibers and waste incineration bottom ash and preparation method thereof |
| CN115215594A (en) * | 2022-08-05 | 2022-10-21 | 东北电力大学 | Straw ash-concrete waste slurry all-solid waste cold bonding lightweight aggregate and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4336069A (en) * | 1981-02-17 | 1982-06-22 | W. R. Grace & Co. | High strength aggregate for concrete |
| US5196620A (en) * | 1991-06-13 | 1993-03-23 | Municipal Services Corporation | Fixation and utilization of ash residue from the incineration of municipal solid waste |
| CN103769287A (en) * | 2014-01-28 | 2014-05-07 | 桐乡市同德墙体建材有限公司 | Technology for breaking, sorting and recycling household garbage incineration slag |
| CN107470324A (en) * | 2017-08-15 | 2017-12-15 | 刘联仓 | A kind of recycling municipal solid waste processing method |
| CN108218272A (en) * | 2016-12-22 | 2018-06-29 | 纳米及先进材料研发院有限公司 | Derived from the environmentally friendly artificial aggregate of waste（Aggregate） |
-
2018
- 2018-10-30 CN CN201811277646.9A patent/CN111116167A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4336069A (en) * | 1981-02-17 | 1982-06-22 | W. R. Grace & Co. | High strength aggregate for concrete |
| US5196620A (en) * | 1991-06-13 | 1993-03-23 | Municipal Services Corporation | Fixation and utilization of ash residue from the incineration of municipal solid waste |
| CN103769287A (en) * | 2014-01-28 | 2014-05-07 | 桐乡市同德墙体建材有限公司 | Technology for breaking, sorting and recycling household garbage incineration slag |
| CN108218272A (en) * | 2016-12-22 | 2018-06-29 | 纳米及先进材料研发院有限公司 | Derived from the environmentally friendly artificial aggregate of waste（Aggregate） |
| CN107470324A (en) * | 2017-08-15 | 2017-12-15 | 刘联仓 | A kind of recycling municipal solid waste processing method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142395A (en) * | 2020-08-27 | 2020-12-29 | 扬州大学 | Cement-stabilized macadam mixture doped with waste incineration slag |
| CN112694279A (en) * | 2021-01-05 | 2021-04-23 | 广东科学技术职业学院 | Lightweight aggregate with core-shell structure and preparation method thereof |
| CN112694279B (en) * | 2021-01-05 | 2022-04-19 | 广东科学技术职业学院 | Lightweight aggregate with core-shell structure and preparation method thereof |
| CN113620630A (en) * | 2021-07-16 | 2021-11-09 | 中国科学院武汉岩土力学研究所 | Method for preparing building aggregate from household garbage incinerator slag |
| CN113800830A (en) * | 2021-09-10 | 2021-12-17 | 深圳大学 | Artificial aggregate based on polypropylene fibers and waste incineration bottom ash and preparation method thereof |
| CN115215594A (en) * | 2022-08-05 | 2022-10-21 | 东北电力大学 | Straw ash-concrete waste slurry all-solid waste cold bonding lightweight aggregate and preparation method thereof |
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