CN116102781A - Polyurethane pavement regeneration method and application thereof - Google Patents
Polyurethane pavement regeneration method and application thereof Download PDFInfo
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- CN116102781A CN116102781A CN202310136306.9A CN202310136306A CN116102781A CN 116102781 A CN116102781 A CN 116102781A CN 202310136306 A CN202310136306 A CN 202310136306A CN 116102781 A CN116102781 A CN 116102781A
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- polyurethane
- pavement
- reclaimed material
- reclaimed
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a polyurethane pavement regeneration method, which is characterized in that a polyurethane pavement is crushed and screened to obtain a polyurethane reclaimed material, the performance of the polyurethane reclaimed material is improved to obtain polyurethane reclaimed material, the polyurethane pavement regeneration is realized, and the reclaimed material can be used for the polyurethane pavement and various grades of roads through a wrapping treatment technology.
Description
Field of regeneration methods
The invention relates to the field of C04B28/12, in particular to a polyurethane pavement regeneration method and application thereof.
Background re-establishmentMethod of producing
The construction industry is one of the post industries of national economy in China, but the prosperous development of the construction industry brings a large amount of construction waste, so the recycling of the waste construction waste is not slow, the polyurethane pavement material reaching the service life has high strength, the waste polyurethane material is recycled in a new road structure, the damage pollution of the polyurethane waste to the ecological environment is reduced, the aggregate in the new pavement material is replaced according to the strength of the waste material, stone exploitation is reduced, and the method has important significance for realizing sustainable utilization of waste resources.
CN114394810a discloses a construction waste recycled road surface base material, which comprises: slaked lime or/and cement, slag, red gangue, fiber, alkali excitant and the balance of construction waste recycled aggregate, wherein the recycled coarse aggregate is recycled aggregate obtained by crushing and screening waste concrete. The slag, the red gangue, the fiber and the alkali-activated agent used in the patent can be better suitable for the construction waste recycled aggregate as the base material. However, the existing asphalt pavement regeneration method generally adopts a high-temperature heating pavement of more than 200 ℃ on site, and the recovered RAP material is generally in a state that coarse aggregate is coated with aged asphalt and powder. The fatigue performance of the reclaimed asphalt pavement and further the service life of the reclaimed asphalt pavement can be seriously influenced by the unrepeatable aged asphalt during recycling. The proportion of the recycled aggregate is limited, and the method can only be used for constructing partial horizons of low-grade highways.
In addition, existing recycling methods are directed to asphalt or cement concrete pavements. And screening the crushed original pavement. The waste treated material is used for roadbed filling or highway cushion layer. The existing polyurethane materials are used for drainage pavement, and the pavement structure of the asphalt material is not completely replaced by polyurethane.
Disclosure of Invention
Aiming at the problems, the invention discloses a polyurethane pavement regeneration method, which is used for crushing and screening a polyurethane pavement to obtain a polyurethane reclaimed material, and improving the performance of the polyurethane reclaimed material to obtain a polyurethane reclaimed material so as to realize the regeneration of the polyurethane pavement.
As a preferable technical scheme, the crushing process specifically comprises the following steps: and (3) crushing the whole waste polyurethane pavement in situ by adopting hammer crushing, and completely crushing and removing the whole polyurethane pavement structural layer.
Preferably, the average thickness of the break is 4-6cm.
As a preferable technical scheme, the crushed polyurethane is screened, and the maximum nominal particle size is less than or equal to 20mm.
As a preferable technical scheme, the performance is improved by wrapping the crushed and sieved polyurethane reclaimed materials by using an adhesive.
Preferably, the adhesive is selected from one or more of natural polymer compounds, synthetic polymer compounds and inorganic compounds.
Further preferably, the adhesive is a synthetic polymer compound.
The high molecular compound includes, but is not limited to, epoxy resin, phenolic resin, urea resin, polyurethane, polyvinyl acetal, perchloroethylene resin, neoprene, and nitrile rubber.
Preferably polyurethane.
Further preferably, the polyurethane is a one-component moisture-cure polyurethane adhesive.
As a preferable technical scheme, the average thickness of the adhesive coated on the surface of the polyurethane reclaimed material is 5-20 mu m.
Preferably, the average thickness of the adhesive coated on the surface of the polyurethane reclaimed material is 10 mu m.
As a preferable technical scheme, the process for coating the adhesive on the surface of the polyurethane reclaimed material comprises the following steps:
weighing polyurethane cementing material needing to be wrapped and lifted:
the calculation formula of the polyurethane cementing material dosage:
SA＝Σ(P i ×FA i )
M＝JA×ρ×p×SA
wherein: SA-specific surface area of aggregate, m 2 /kg；
P i -mass passage percentage,%;
FA i -surface area coefficient of aggregate corresponding to each sieve pore, m 2 /kg；
JA, effective thickness of polyurethane film, μm;
rho-polyurethane Density, g/cm 3 ；
P-the sum of the percentages of the various mineral aggregates to the total mass of the bituminous mixture.
Preferably, the mass of the polyurethane cementing material is 1% -3% of the total mass.
Further preferably, the mass of the polyurethane cement is 2% of the total mass.
Preferably, the stirring speed is 30-60r/min, and the stirring time is 1-5min.
Further preferably, the stirring rotation speed is 45r/min, and the stirring time is 2min.
As a preferable technical scheme, before performance improvement, the polyurethane reclaimed materials are required to be blown to remove dust and dried.
Preferably, the temperature of the drying is 100-120 ℃ and the drying time is 6-10h.
Further preferably, the temperature of the drying is 110 ℃, and the drying time is 8 hours.
According to the method, the polyurethane pavement reaching the service life is crushed, recovered, regenerated, the crushed and screened polyurethane reclaimed materials are irregular in shape, residual polyurethane cementing materials are adhered to the surface, the mechanical strength is still not satisfied with the requirements of the regenerated pavement or a newly built road on the strength (mainly crushing value) of aggregates for roads, the recovered aggregates are required to be pretreated, the recycled aggregates can be used in all structural layers of the polyurethane pavement and all grades of roads, a great amount of researches are carried out by the applicant, the polyurethane reclaimed materials are required to be blown to remove dust and be dried before performance is improved, the drying temperature is 100-120 ℃, and the drying time is 6-10 hours, and the applicant considers that possible reasons are as follows: the effect of dust removal stoving is that make the reclaimed material surface clean, can with the better parcel of new polyurethane cementing material, and control the temperature of stoving to be 100-120 ℃, the time of stoving is 6-10 hours, can control the maximum moisture content of reclaimed material to be within 3%, lower moisture content can not influence the solidification effect of polyurethane for reclaimed material can be good the parcel polyurethane coating, increase reclaimed material's intensity, after polyurethane solidification, the coating formation intensity of coating on reclaimed material surface has further promoted reclaimed material's crushing value, and when the moisture content is too big, reclaimed material and adhesive bond power is showing and is reduced, can't realize the solidification parcel of surface and cover, influence mechanical properties.
The invention is the recovery of polyurethane pavement, the main components of the recovery material are polyurethane and milling stones of the original pavement, so the single-component moisture-curing polyurethane adhesive can have good wrapping effect, but the applicant finds that the stirring time is controlled to be less than 5min and the stirring speed is controlled to be less than 60r/min, otherwise, a large amount of bubbles appear after the adhesive is coagulated, and the mechanical property of the reclaimed materials is affected.
As a preferred embodiment, the polyurethane reclaimed material has a maximum nominal particle diameter of less than 20mm.
The invention also discloses an application of the polyurethane pavement regeneration method, and the regeneration material directly replaces new aggregate to perform pavement construction.
Advantageous effects
1. Before performance improvement, the polyurethane reclaimed materials are required to be blown to remove dust and dried, so that better wrapping can be realized, and the mechanical strength can be improved only by coating polyurethane.
2. The drying temperature is controlled to be 100-120 ℃, the drying time is controlled to be 6-10 hours, and the mechanical strength of the polyurethane reclaimed material can be ensured.
3. The mass of the polyurethane cementing material is controlled to be 1-2.5% of the total mass, the size of the crushing value meets the standard requirement, and the economic benefit is high.
4. The polyurethane regenerating technology aims at the novel full polyurethane alternative pavement form and provides the regenerating technology. 100% of recovered polyurethane pavement reaching service life can be used as brand new aggregate, and the recovered material can be used in each structural layer of the polyurethane pavement and each grade of highway of asphalt or cement concrete through a wrapping treatment technology.
Detailed Description
Example 1
This example 1 discloses a polyurethane pavement recycling method, in which a polyurethane pavement is crushed and screened to obtain a polyurethane reclaimed material, and the polyurethane reclaimed material is subjected to performance improvement to obtain a polyurethane reclaimed material, so as to realize polyurethane pavement recycling.
The crushing process specifically comprises the following steps: and (3) crushing the whole waste polyurethane pavement in situ by adopting hammer crushing, and completely crushing and removing the whole polyurethane pavement structural layer.
The average thickness of the break was 5cm.
Screening the crushed polyurethane, wherein the maximum nominal particle size is less than or equal to 20mm.
The performance is improved by wrapping the broken and sieved polyurethane reclaimed materials by using an adhesive.
The adhesive is a single-component moisture-curing polyurethane adhesive, and is purchased from Yu Mohua chemical group Co., ltd.
The average thickness of the adhesive coated on the surface of the polyurethane reclaimed material is 10 mu m.
The process of wrapping the adhesive on the surface of the polyurethane reclaimed material comprises the steps of pouring the polyurethane reclaimed material into the adhesive and stirring.
The mass of the polyurethane cementing material is 2% of the total mass.
The stirring rotating speed is 45r/min, and the stirring time is 2min.
Before performance improvement, the polyurethane reclaimed materials are required to be blown to remove dust and dried.
The drying temperature is 110 ℃, and the drying time is 8 hours.
In another aspect, this embodiment 1 discloses an application of the polyurethane pavement recycling method, wherein recycled materials directly replace asphalt to perform pavement construction or replace stone to perform pavement construction.
Example 2
This embodiment differs from embodiment 1 in that: the mass of the polyurethane cementing material is 0.5% of the total mass.
Example 3
This embodiment differs from embodiment 1 in that: the mass of the polyurethane cementing material is 1.0% of the total mass.
Example 4
This embodiment differs from embodiment 1 in that: the mass of the polyurethane cementing material is 1.5% of the total mass.
Example 5
This embodiment differs from embodiment 1 in that: the mass of the polyurethane cementing material is 2.5% of the total mass.
The change of the crushing value of the reclaimed materials under different coating dosages of polyurethane is evaluated by adopting a coarse aggregate crushing value test in JTG E42-2005 of highway engineering aggregate test procedure.
The reclaimed materials with the particle diameters of 10-20mm were selected for the test, and the test results are shown in the following table 1.
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Crush value | 16.3 | 29.1 | 23.6 | 20.7 | 15.9 |
Along with the increase of the dosage, the surface of the reclaimed material is coated with a complete polyurethane coating, the crushing value gradually becomes smaller, when the dosage of MDI is 2.0%, the size of the crushing value meets the standard requirement, if the dosage is continuously increased, the crushing value is not obviously improved, and the economic benefit is reduced because of higher price of the polyurethane material.
Example 6
This embodiment differs from embodiment 1 in that: the drying temperature was 150 ℃ and the drying time was 4 hours, and the comparison results with example 1 are shown in table 2.
TABLE 2
Moisture can affect the initial formation strength of MDI after coating and, if it is present, the strength of the polyurethane reclaimed material can be greatly reduced.
Performance testing
1. Mineral aggregate grading composition: the polyurethane reclaimed material obtained in the example 1 is recycled, crushed and sieved to obtain mineral aggregate grading according to the table below to prepare a new polyurethane mixture.
TABLE 3 mineral aggregate grading of regenerated polyurethane mixture
| Mesh size/mm | 16 | 13.2 | 9.5 | 4.75 |
| Mass pass rate/% | 100.0 | 97.0 | 73.4 | 40.4 |
The components are mixed and stirred uniformly in a mixing pot by the reclaimed materials of the mixture in the grading and the new polyurethane cementing material (the dosage is 2%).
The test pieces were molded according to the current test piece molding and curing method in Highway asphalt pavement regeneration technical Specification (JTG/T5521) and Highway engineering asphalt and asphalt mixture test procedure (JTG E20), and the test results are shown in Table 4 below.
TABLE 4 polyurethane regeneration mixture Performance test
2. The material obtained in example 1 was tested in comparison with the crush values of the original reclaimed material (asphalt pavement) and the original reclaimed material (polyurethane pavement), and the results are shown in Table 5.
TABLE 5
The polyurethane pavement has higher strength than the asphalt pavement after being recycled, but the recycled material can only be used for filling a base layer, and the crushing value strength after being coated with MDI can be 100% used for newly building each structural layer of the pavement.
Claims (10)
1. A polyurethane pavement regeneration method is characterized in that a polyurethane pavement is crushed and screened to obtain a polyurethane reclaimed material, and the polyurethane reclaimed material is subjected to performance improvement to obtain polyurethane reclaimed material so as to realize polyurethane pavement regeneration.
2. The regeneration method according to claim 1, characterized in that the crushing process is in particular: and (3) crushing the whole waste polyurethane pavement in situ by adopting hammer crushing, and completely crushing and removing the whole polyurethane pavement structural layer.
3. The regeneration method according to claim 2, characterized in that the average thickness of the break is 4-6cm.
4. The method according to claim 1, wherein the crushed polyurethane is sieved to a maximum nominal particle size of 20mm or less.
5. The recycling method according to claim 1, wherein the performance is improved by coating the crushed and sieved polyurethane reclaimed materials with an adhesive.
6. The method according to claim 5, wherein the adhesive is one or a combination of natural polymer compound, synthetic polymer compound, and inorganic compound.
7. The recycling method according to claim 6, wherein the adhesive is coated on the surface of the polyurethane reclaimed material with an average thickness of 5-20 μm.
8. The method of regenerating according to any one of claims 1 to 7, wherein before performance improvement, blowing dust removal and drying of the polyurethane reclaimed material are required.
9. The regeneration method according to claim 8, wherein the drying temperature is 100-120 ℃ and the drying time is 6-10 hours.
10. Use of a recycling method according to any of claims 1-9, characterized in that the recycling material is used for road construction directly instead of aggregate for asphalt pavement or instead of stone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310136306.9A CN116102781A (en) | 2023-02-20 | 2023-02-20 | Polyurethane pavement regeneration method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310136306.9A CN116102781A (en) | 2023-02-20 | 2023-02-20 | Polyurethane pavement regeneration method and application thereof |
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| Publication Number | Publication Date |
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| CN116102781A true CN116102781A (en) | 2023-05-12 |
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| CN202310136306.9A Pending CN116102781A (en) | 2023-02-20 | 2023-02-20 | Polyurethane pavement regeneration method and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117902870A (en) * | 2024-03-20 | 2024-04-19 | 北京建筑大学 | Regenerated waste polyether polyurethane concrete and preparation method thereof |
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2023
- 2023-02-20 CN CN202310136306.9A patent/CN116102781A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117902870A (en) * | 2024-03-20 | 2024-04-19 | 北京建筑大学 | Regenerated waste polyether polyurethane concrete and preparation method thereof |
| CN117902870B (en) * | 2024-03-20 | 2024-05-31 | 北京建筑大学 | Regenerated waste polyether polyurethane concrete and preparation method thereof |
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