CN114516744A - Pavement repair concrete containing building waste aggregate - Google Patents
Pavement repair concrete containing building waste aggregate Download PDFInfo
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- CN114516744A CN114516744A CN202210241659.0A CN202210241659A CN114516744A CN 114516744 A CN114516744 A CN 114516744A CN 202210241659 A CN202210241659 A CN 202210241659A CN 114516744 A CN114516744 A CN 114516744A
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- slag
- carbonate
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- 239000004567 concrete Substances 0.000 title claims abstract description 66
- 230000008439 repair process Effects 0.000 title claims abstract description 34
- 239000002699 waste material Substances 0.000 title claims abstract description 25
- 239000010426 asphalt Substances 0.000 claims abstract description 66
- 239000004568 cement Substances 0.000 claims abstract description 64
- 239000002893 slag Substances 0.000 claims abstract description 48
- 150000004645 aluminates Chemical class 0.000 claims abstract description 45
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 34
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 31
- 239000004575 stone Substances 0.000 claims abstract description 17
- 239000011449 brick Substances 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000010814 metallic waste Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 50
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 23
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 18
- 229910052749 magnesium Inorganic materials 0.000 claims description 18
- 239000011777 magnesium Substances 0.000 claims description 18
- 238000010276 construction Methods 0.000 claims description 16
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 15
- 239000001095 magnesium carbonate Substances 0.000 claims description 15
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 15
- 239000003208 petroleum Substances 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 238000002360 preparation method Methods 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000126 substance Substances 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 230000036961 partial effect Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 230000002441 reversible effect Effects 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- -1 aluminate ions Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000010954 inorganic particle Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- YALMXYPQBUJUME-UHFFFAOYSA-L calcium chlorate Chemical compound [Ca+2].[O-]Cl(=O)=O.[O-]Cl(=O)=O YALMXYPQBUJUME-UHFFFAOYSA-L 0.000 description 1
- VMLAJPONBZSGBD-UHFFFAOYSA-L calcium;hydrogen carbonate;hydroxide Chemical compound [OH-].[Ca+2].OC([O-])=O VMLAJPONBZSGBD-UHFFFAOYSA-L 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 229960001545 hydrotalcite Drugs 0.000 description 1
- 229910001701 hydrotalcite Inorganic materials 0.000 description 1
- 229910001410 inorganic ion Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- 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
- C04B28/06—Aluminous 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
-
- 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
Abstract
The application relates to the field of concrete, and particularly discloses pavement repair concrete containing building waste aggregate. The application discloses pavement repair concrete containing building waste aggregate is prepared from the following raw materials in parts by weight: 0.6-1 part of nano metal carbonate, 90-110 parts of aluminate cement, 9-16 parts of regenerated asphalt, 1-3 parts of metal waste residues, 300-400 parts of broken stone, 80-100 parts of ground brick slag and 45-55 parts of water. The pavement repair concrete has the advantages of high compressive strength and bending tensile strength, excellent slump and low shrinkage rate.
Description
Technical Field
The application relates to the field of concrete, in particular to pavement repair concrete containing building waste aggregate.
Background
The construction waste refers to waste materials generated in the process of building, construction, network management and the like, laying or dismantling, and repairing, and generally comprises broken stones, broken bricks and tiles, waste asphalt, waste brick residues, waste metals and the like.
In the related art, the chinese application with the application number of 201410332590.8 discloses an early-setting and fast-hardening type flowable backfill material based on sulphoaluminate cement produced by construction waste, which comprises construction waste fine materials, the early-hardening sulphoaluminate cement, an additive, an admixture and water, wherein the admixture is one of slag powder, fly ash, phosphorous slag powder, silica fume or cohesive soil; (1) the content of particles larger than 4.75mm is less than 10 percent; (2) the content of organic matters is less than 1 percent; (3) the content of particles smaller than 0.075mm is greater than 8%; (4) the construction waste fines do not contain heavy metals.
In view of the above-mentioned related technologies, the inventor believes that when the damaged pavement is backfilled after the rapid hardening sulphoaluminate cement is directly mixed with the construction waste, the quality of the backfilled part of the damaged pavement is poor after backfilling because the sulphoaluminate cement is inverted and contracted after solidification.
Disclosure of Invention
In order to improve the problem that the recycling quality of the backfill position of the damaged pavement is affected by the reverse shrinkage of the sulphoaluminate cement after solidification, the application provides the pavement repair concrete containing the building garbage aggregate.
In a first aspect, the application provides a road surface repair concrete containing construction waste aggregate, which adopts the following technical scheme:
the pavement repair concrete containing the building garbage aggregate is prepared from the following raw materials in parts by weight: 0.6-1 part of nano metal carbonate, 90-110 parts of aluminate cement, 9-16 parts of regenerated asphalt, 1-3 parts of metal waste residues, 300-400 parts of broken stone, 80-100 parts of ground brick slag and 45-55 parts of water.
By adopting the technical scheme, the nano metal carbonate with smaller particle size has larger specific surface area, so that after the nano metal carbonate with smaller particle size and the regenerated asphalt are uniformly mixed, chemical components in the regenerated asphalt can be redistributed on the surface of the nano metal carbonate and form a layer of diffusion solvent film, and the nano metal carbonate particles are connected by the diffusion solvent film, so that the formed regenerated asphalt has larger contact area of the diffusion solvent film and larger viscosity, and can obtain larger cohesive force. Therefore, the nano metal carbonate is doped into the regenerated asphalt, which is beneficial to improving the cohesive force and the strength of the regenerated asphalt.
Hydration products of the aluminate cement gradually generate CAH10, CAH8 and CAH6 in turn along with the rise of temperature, and the reaction is irreversible; wherein, CAH10 and CAH8 belong to hexagonal crystal forms, but CAH6 belongs to cubic crystal forms, and the hexagonal crystal forms have better cohesive force than the cubic crystal forms, because the aluminate cement can generate reverse shrinkage at the later stage, and the reverse shrinkage can not be recovered; after the nano metal carbonate is added, on one hand, the nano metal carbonate can react with aluminate in the aluminate cement to generate hydrated aluminate, and the hydrated aluminate belongs to a hexagonal crystal form and has strong binding power, so that the phenomenon that part of aluminate cement is subjected to reverse shrinkage in the later period can be effectively avoided; on the other hand, the inactive nano metal carbonate can be filled in the pores among hydration products of the partial aluminate cement, and the influence of the partial aluminate cement retraction on the overall performance of the aluminate cement is reduced. Therefore, after the nano metal carbonate is added, the shrinkage of the aluminate cement can be relieved, and the aluminate cement and the regenerated asphalt can be connected into a whole by the nano metal carbonate.
The metal waste slag has the adding effect that the metal waste slag expands to make up for the shrinkage gap generated by partial aluminate cement and enhance the overall stability of the pavement repair concrete due to the larger coefficient of expansion with heat and contraction with cold of the metal; the broken stone is coarse aggregate in the application, the levigated brick slag is fine aggregate, the pavement repairing concrete prepared by adopting the raw materials has the advantages of high compressive strength and bending tensile strength, excellent slump and low shrinkage rate, and the stability of the damaged pavement backfilled by adopting the pavement repairing concrete is higher.
Optionally, the nano carbonate is one or more of nano calcium carbonate and nano magnesium carbonate.
By adopting the technical scheme, the nano calcium carbonate and the nano magnesium carbonate are nontoxic, and the active nano calcium carbonate can react with calcium chlorate in the aluminate cement to generate hexagonal calcium carbonate hydrate, so that the aluminate cement keeps higher cohesiveness for a long time; the inactive nano carbonate can be filled into the pores among partial hydration products of the aluminate cement to compensate the influence of the shrinkage of the aluminate cement on the aluminate cement.
The introduction of carbonate can reduce the erosion capability of carbon dioxide to the aluminate cement and improve the carbonization resistance of the aluminate cement.
When magnesium in the nano magnesium carbonate is introduced into aluminate cement, magnesium ions and aluminate ions are easy to generate hydrotalcite, and the compressive strength of the rapid hardening cement is further improved.
Optionally, the metal slag is one or more of magnesium slag and iron slag.
By adopting the technical scheme, the magnesium slag and the iron slag are two common metal slag, are both environment-friendly and pollution-free, and most importantly, the metal magnesium and the metal iron have larger thermal expansion coefficients, so that the metal magnesium and the metal iron can further compensate gaps generated by shrinkage of aluminate, the compressive strength and the bending tensile strength of the pavement repairing concrete are enhanced, and the dry shrinkage rate is reduced.
Optionally, the particle sizes of the nano calcium carbonate and the nano magnesium carbonate are both 50-100 nm.
By adopting the technical scheme, when the particle size is 1-100 nm, the number of atoms on the surface of the particle is increased, and active points with high activity are formed on the surface of the particle due to quantum tunneling effect and the like, so that lone pair electrons exist on the surface of the particle, a chemical bond is formed between the particle and a polymer in the regenerated asphalt, namely, a chemical action is generated, and the better the cohesive force between the nano carbonate and the regenerated asphalt is; however, the nano magnesium carbonate and the nano calcium carbonate with too small particle size are difficult to obtain, and the grinding cost is high, so that the nano calcium carbonate and the nano magnesium carbonate with 50-100 nm are most suitable.
Optionally, the reclaimed asphalt is one or more of reclaimed natural asphalt, reclaimed petroleum asphalt or reclaimed shale asphalt.
By adopting the technical scheme, the regenerated natural asphalt, the regenerated petroleum asphalt or the regenerated shale asphalt is the emulsified asphalt which has better temperature stability and is difficult to volatilize harmful gas, is better for the environment after long-term use and cannot cause damage to organisms.
In a second aspect, the application provides a preparation method of pavement repair concrete containing construction waste aggregate, which adopts the following technical scheme:
The preparation method of the pavement repair concrete comprises the following steps:
step I, uniformly mixing nano carbonate and regenerated asphalt to obtain modified regenerated asphalt;
step II, mixing aluminate cement, metal waste slag and modified recycled asphalt uniformly to obtain modified cement;
and step III, uniformly mixing water, modified cement, ground brick slag and broken stone to obtain the pavement repair concrete.
By adopting the technical scheme, the nano carbonate and the regenerated asphalt are uniformly mixed in the step I, so that the regenerated asphalt can uniformly wrap the nano carbonate to form modified regenerated asphalt with higher cohesive force; in the step II, aluminate cement, metal waste slag and modified recycled asphalt are uniformly mixed, so that the shrinkage of the aluminate cement is inhibited, and the influence of the shrinkage on the modified cement can be weakened; and step III, uniformly mixing the modified cement, the broken stone, the ground brick slag and water, and preparing the pavement repair concrete in a conventional mode, wherein the prepared pavement repair concrete has the advantages of high compressive strength, high bending and tensile strength, excellent slump and low dry shrinkage, and the damaged pavement backfilled by the pavement repair concrete has high stability.
Optionally, the step I is uniformly mixed by adopting a stirring mode, and the uniform mixing condition is that the mixture is stirred at the speed of 1200-1600 r/min at the temperature of 150-180 ℃.
By adopting the technical scheme, under the reaction condition, the nano carbonate can be fully and uniformly mixed in the regenerated asphalt, and van der Waals force exists between the nano carbonate and a high polymer material in the regenerated asphalt, so that the nano carbonate and the regenerated asphalt form a whole through physical adsorption; in addition, because the inorganic particles with small particle size have few surface defects, many unpaired atoms and large surface area, and the inorganic ions and the polymer have high possibility of chemical bonding at proper temperature and stirring speed, the interface bonding of the inorganic particles with chemical bonding and the regenerated asphalt can bear larger load, thereby achieving the purposes of strengthening and toughening.
Optionally, the particle size of the crushed stone in the step III is 10-25 mm; the particle size of the ground brick slag is 0-5 mm.
By adopting the technical scheme, the broken stones are used as coarse aggregates in the pavement repairing concrete, so that the effect of improving the hardness of the concrete is achieved; the ground brick slag with smaller particle size is added into the broken stones, so that gaps among the broken stones are just filled, and the compressive strength and the bending tensile strength of the pavement repair concrete are enhanced.
In summary, the present application has the following beneficial effects:
1. chemical components in the regenerated asphalt can be redistributed on the surface of the nano metal carbonate to form a layer of diffusion solvent film, so that the cohesive force and the strength of the regenerated asphalt are improved; the nano metal carbonate can react with aluminate in the aluminate cement to generate hydrated carbonate aluminate with a hexagonal crystal form, and the inactive nano metal carbonate can also be filled in pores among hydration products of the aluminate cement, so that the shrinkage rate of the aluminate cement is reduced; when the temperature rises, the metal waste slag expands to make up for the shrinkage gap of aluminate cement and enhance the overall stability of the pavement repair concrete;
2. the carbonate is introduced, so that the erosion capacity of carbon dioxide to the aluminate cement can be reduced, and the carbonation resistance of the aluminate cement is improved;
3. the reason for adding the magnesium slag and the iron slag is that the thermal expansion coefficient of the metal magnesium and the metal iron is larger, so the metal magnesium and the metal iron can further compensate the gap generated by the shrinkage of the aluminate cement, enhance the compressive strength and the bending tensile strength of the pavement repairing concrete, and reduce the dry shrinkage rate.
Detailed Description
The present application will be described in further detail with reference to examples.
Providing a pavement repair concrete containing construction waste aggregate, and providing a raw material source for the following examples and comparative examples: the nano calcium carbonate has the particle size of 50-100 nm and is purchased from Nanjing Xiancheng nano material science and technology limited company; the nano magnesium carbonate with the particle size of 50-100 nm is purchased from Wuzi Zehui chemical Co., Ltd; aluminate cement, which is commonly purchased in the market; other raw materials, obtained by the applicant demolishing a waste building.
Example 1
The preparation method of the pavement repair concrete containing the building garbage aggregate comprises the following steps:
step I, uniformly mixing 0.6g of nano calcium carbonate and 9g of regenerated petroleum asphalt at the temperature of 160 ℃ at the speed of 1400r/min to obtain modified regenerated asphalt;
step II, uniformly mixing 110g of aluminate cement, 3g of magnesium slag and modified recycled asphalt at normal temperature at the speed of 500r/min to obtain modified cement;
step III, adding 45g of water, modified cement, 100g of ground brick slag and 300g of broken stone into a continuous concrete mixer in sequence for stirring, wherein the stirring temperature is normal temperature, and the stirring speed is 25m3And h, stirring for 10min, and finishing stirring to obtain the pavement repair concrete.
Example 2
The preparation method of the pavement repair concrete containing the building garbage aggregate comprises the following steps:
Step I, uniformly mixing 1g of nano calcium carbonate and 16g of recycled petroleum asphalt at the temperature of 160 ℃ at the speed of 1400r/min to obtain modified recycled asphalt;
step II, uniformly mixing 90g of aluminate cement, 1g of magnesium slag and modified recycled asphalt at normal temperature at the speed of 500r/min to obtain modified cement;
step III, adding 55g of water, modified cement, 80g of ground brick slag and 400g of broken stone into a continuous concrete mixer in sequence for stirring, wherein the stirring temperature is normal temperature, and the stirring speed is 25m3And h, stirring for 10min, and obtaining the pavement repairing concrete after the stirring is finished.
Example 3
Step I, uniformly mixing 0.8g of nano calcium carbonate and 12g of regenerated petroleum asphalt at the temperature of 160 ℃ at the speed of 1400r/min to obtain modified regenerated asphalt;
step II, uniformly mixing 100g of aluminate cement, 2g of magnesium slag and modified recycled asphalt at normal temperature at the speed of 500r/min to obtain modified cement;
step III, adding 50g of water, modified cement, 90g of ground brick slag and 350g of broken stone into a continuous concrete mixer in sequence for stirring, wherein the stirring temperature is normal temperature, and the stirring speed is 25m3And h, stirring for 10min, and finishing stirring to obtain the pavement repair concrete.
Example 4
The difference from example 3 is that: the step I is different;
step I, uniformly mixing 0.8g of nano magnesium carbonate and 12g of regenerated petroleum asphalt at the temperature of 160 ℃ at the speed of 1400r/min to obtain modified regenerated asphalt;
steps II and III were the same as in example 3.
Example 5
The difference from example 3 is that: step I is different;
step I, uniformly mixing 0.4g of nano magnesium carbonate, 0.4g of nano calcium carbonate and 12g of regenerated petroleum asphalt at the temperature of 160 ℃ at the speed of 1400r/min to obtain modified regenerated asphalt;
steps II and III were the same as in example 3.
Example 6
The difference from example 3 is that: step I is different;
step I, uniformly mixing 0.8g of nano sodium carbonate and 12g of regenerated petroleum asphalt at the temperature of 160 ℃ at the speed of 1400r/min to obtain modified regenerated asphalt;
steps II and III were the same as in example 3.
Example 7
The difference from example 3 is that: step II is different;
step II, uniformly mixing 10g of aluminate cement, 2g of iron slag and modified recycled asphalt at normal temperature at the speed of 500r/min to obtain modified cement;
steps I and III were the same as in example 3.
Example 8
The difference from example 3 is that: step II is different;
Step II, uniformly mixing 100g of aluminate cement, 1g of iron slag, 1g of magnesium slag and modified recycled asphalt at normal temperature at the speed of 500r/min to obtain modified cement;
steps I and III were the same as in example 3.
Example 9
The difference from example 3 is that: step I is different;
step I, uniformly mixing 0.8g of nano calcium carbonate with the particle size of 50-100 microns with 12g of regenerated petroleum asphalt at the temperature of 160 ℃ at the speed of 1400r/min to obtain modified regenerated asphalt;
steps II and III were the same as in example 3.
Example 10
The difference from example 3 is that: step I is different;
step I, uniformly mixing 0.8g of nano calcium carbonate, 12g of regenerated natural asphalt and regenerated petroleum asphalt at the temperature of 160 ℃ at the speed of 1400r/min to obtain modified regenerated asphalt;
steps II and III were the same as in example 3.
Comparative example 1
The difference from example 3 is that: and (3) nano calcium carbonate is not added in the step I.
Comparative example 2
The difference from example 3 is that: and step II, magnesium slag is not added.
Comparative example 3
The difference from example 3 is that: nano calcium carbonate is not added in the step I; and step II, magnesium slag is not added.
Comparative example 4
The difference from example 3 is that: and replacing the aluminate cement with the same weight in the step II by the silicate cement with the same weight.
Comparative example 5
Step I, uniformly mixing 0.8g of nano calcium carbonate, 12g of regenerated petroleum asphalt, 100g of aluminate cement and 2g of magnesium slag at normal temperature at a speed of 500r/min, and then continuously stirring at a speed of 500r/min under the condition of 160 ℃ to obtain modified cement;
step II, adding 50g of water, modified cement, 90g of ground brick slag and 350g of broken stone into a continuous concrete mixer in sequence for stirring, wherein the stirring temperature is normal temperature, and the stirring speed is 25m3And h, stirring for 10min, and obtaining the pavement repairing concrete after the stirring is finished.
Performance test
The performance tests were performed using the pavement repair concrete prepared in examples 1 to 10 and comparative examples 1 to 5, and the test results of 28d compressive strength, 28d shrinkage, slump, and 28d flexural tensile strength were shown in table 1 according to test procedures for road engineering cement and cement concrete (JTGE 30-2017);
TABLE 1
By combining examples 1 and 2 and example 3, it can be seen that the 28d compressive strength, 28d shrinkage, slump and 28d flexural tensile strength values of the pavement repairing concrete prepared in example 3 are better because the raw material ratio of example 3 is more suitable than those of examples 1 and 2.
By combining examples 3, 4, 5 and 6, when nano magnesium carbonate is replaced by nano calcium carbonate, the 28d compressive strength, 28d dry shrinkage, slump and 28d bending tensile strength of the finally prepared pavement repairing concrete are hardly influenced, and when nano magnesium carbonate and nano calcium carbonate are added at the same time, the 28d compressive strength, 28d dry shrinkage, slump and 28d bending tensile strength of the pavement repairing concrete are almost the same as the values of the nano calcium carbonate or nano magnesium carbonate which is added alone, so that the influence of the addition of the nano calcium carbonate or the nano magnesium carbonate or the mixture of the nano calcium carbonate and the nano magnesium carbonate on the performance of the pavement repairing concrete is proved to be equivalent.
By combining the examples 3, 7 and 8, it can be seen that the addition of the iron slag, the magnesium slag or the mixture of the iron slag and the magnesium slag to the raw materials of the pavement repair concrete has a considerable effect on the performance of the pavement repair concrete.
By combining the embodiment 3 and the embodiment 9, it can be seen that when the particle size of the nano calcium carbonate is increased to 50 to 100 μm, the 28d compressive strength, 28d dry shrinkage, slump and 28d bending strength of the prepared pavement repairing concrete are all superior to those of the 28d compressive strength, 28d dry shrinkage, slump and 28d bending strength of the pavement repairing concrete prepared in the embodiment 3, because the particle size of the nano carbonate in the embodiment 9 is slightly larger, the nano carbonate cannot be uniformly mixed with the regenerated petroleum asphalt, and all performances of the finally prepared pavement repairing concrete are affected.
By combining the example 3 and the comparative examples 1, 2 and 3, it can be seen that when nano carbonate or metal waste residues are not added in the raw materials for preparing the pavement repair concrete, the performances of the prepared pavement repair concrete are far inferior to those of the pavement repair concrete prepared in the example 3; when the nano carbonate and the metal slag are not added into the raw materials of the pavement repairing concrete at the same time, the prepared pavement repairing concrete has the worst performance, and the addition of any one substance of the nano carbonate and the metal slag is proved to have great influence on the performance of the pavement repairing concrete.
By combining the example 3 and the comparative example 5, it can be seen that when the steps i and ii are performed simultaneously, the nano calcium carbonate cannot be well mixed with the recycled petroleum asphalt, and the modification effect on the recycled petroleum asphalt is poor, so that the performances of the finally prepared pavement repairing concrete are not as good as those of the pavement repairing concrete prepared in the example 3.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The pavement repair concrete containing the building garbage aggregate is characterized by being prepared from the following raw materials in parts by weight: 0.6-1 part of nano metal carbonate, 90-110 parts of aluminate cement, 9-16 parts of regenerated asphalt, 1-3 parts of metal waste residues, 300-400 parts of broken stone, 80-100 parts of ground brick slag and 45-55 parts of water.
2. The pavement repair concrete containing the construction waste aggregate as claimed in claim 1, wherein the nano carbonate is one or more of nano calcium carbonate and nano magnesium carbonate.
3. The pavement restoration concrete containing the construction waste aggregate as claimed in claim 1, wherein the metal slag is one or more of magnesium slag and iron slag.
4. The pavement repair concrete containing the construction waste aggregate as claimed in claim 1, wherein the nano calcium carbonate and the nano magnesium oxide have a particle size of 50-100 nm.
5. The road repair concrete containing construction waste aggregate according to claim 1, wherein the reclaimed asphalt is one or more of reclaimed natural asphalt, reclaimed petroleum asphalt or reclaimed shale asphalt.
6. A road-surfacing concrete containing construction waste aggregates according to any one of claims 1 to 5, characterised in that the preparation method of the road-surfacing concrete comprises the following steps:
step I, uniformly mixing nano carbonate and regenerated asphalt to obtain modified regenerated asphalt;
step II, mixing aluminate cement, metal waste slag and modified recycled asphalt uniformly to obtain modified cement;
and step III, uniformly mixing water, modified cement, ground brick slag and broken stone to obtain the pavement repair concrete.
7. The pavement restoration concrete containing the construction waste aggregate as claimed in claim 6, wherein the step I is carried out by uniformly mixing in a stirring manner at a speed of 1200-1600 r/min at a temperature of 150-180 ℃.
8. The pavement restoration concrete containing the construction waste aggregate according to claim 6, wherein in the step III, the crushed stone has a particle size of 10-25 mm; the particle size of the ground brick slag is 0-5 mm.
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| CN103360003A (en) * | 2013-07-10 | 2013-10-23 | 杨林江 | Cement asphalt mortar added with nanometer material |
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Application publication date: 20220520 |