CN113788641B - Water-loss-resistant recycled aggregate asphalt concrete and preparation method thereof - Google Patents
Water-loss-resistant recycled aggregate asphalt concrete and preparation method thereof Download PDFInfo
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- CN113788641B CN113788641B CN202111097400.5A CN202111097400A CN113788641B CN 113788641 B CN113788641 B CN 113788641B CN 202111097400 A CN202111097400 A CN 202111097400A CN 113788641 B CN113788641 B CN 113788641B
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/283—Polyesters
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a water-loss-resistant recycled aggregate asphalt concrete and a preparation method thereof. Firstly, modifying a recycled waste PET product by using triethylene tetramine, and drying and crushing to obtain modified PET; then mixing the modified PET with the asphalt in a molten state to obtain PET modified asphalt; and finally, mixing the recycled coarse aggregate, the natural fine aggregate, the natural mineral powder and the PET modified asphalt at a high temperature according to a certain gradation and oilstone ratio to obtain the recycled aggregate asphalt concrete with excellent water loss resistance. The method not only realizes the recycling of the waste concrete aggregate and the waste PET plastic and relieves the problem of environmental pollution, but also greatly reduces the risk of rainwater-load damage to the recycled aggregate asphalt concrete pavement, and the whole process has the advantages of simple process, easy industrial operation, high resource utilization rate and the like.
Description
Technical Field
The invention relates to the technical field of asphalt concrete materials, in particular to a water-loss-resistant recycled aggregate asphalt concrete and a preparation method thereof.
Background
With the development of urban economy, asphalt pavements are increasingly used in highway construction. The large consumption of non-renewable natural stones is required in the paving process of asphalt pavements, resulting in that the mineral resources which are scarce are more in short supply. Therefore, the search for an alternative renewable resource has important engineering significance for the sustainable development of the asphalt pavement.
The construction waste yield is high and the utilization rate is low in China, and how to effectively treat the construction waste becomes an important social subject. For the treatment of construction waste, the recycling of waste concrete is mainly focused, and at present, the waste concrete crushed material is used as recycled aggregate and applied to concrete members, bricks, roadbeds and the like, but the application of the waste concrete crushed material as asphalt concrete aggregate is still less. This is because, compared with natural aggregate, the recycled aggregate has a large amount of mortar adhered to its surface, has high crushing value, high water absorption and high porosity, and is easily peeled off due to weak bonding force of asphalt-recycled aggregate interface when applied to asphalt pavement, especially in a water-soaked environment.
PET beverage bottle is as common disposable plastic product in life, and the rate of recycling is less relatively, mainly carries out simple processing with modes such as burning, landfill at present, has not only wasted the resource but also caused very unfriendly ecological environment pollution. The Chinese patent CN113233825A develops a method for utilizing waste PET plastics, and the collected waste plastics are washed, crushed, dried, melted, extruded and granulated, and then added into recycled concrete, so that the problem of impermeability of the recycled concrete is finally solved. However, the technology does not relate to asphalt concrete, and the problem of water loss resistance of recycled aggregate asphalt concrete cannot be known.
Similarly, in order to solve the recycling problem of PET plastic products, a research result of the subject group of the Cold and genuine professor of hong Kong university (Leng Z, padhan R K, sreeram A. Production of a Sustainable providing material through chemical recycling of waste PET inter-road rubber modified aliphatic J. Journal of Cleaner Production,2018,180 (APR. 10): 682-688) shows that the waste PET treated by the amination method can be used as an asphalt functional additive, which is helpful for enhancing the adhesion between asphalt and natural aggregate, reducing the water sensitivity of asphalt mixture and prolonging the service life of asphalt pavement. But the achievement does not relate to recycled aggregate asphalt concrete and the problem of water damage resistance, and how to solve the problem has very practical engineering significance.
Disclosure of Invention
The invention aims to solve the problems of insufficient recycling of the existing construction wastes and waste plastics, poor water damage resistance of the recycled aggregate asphalt concrete and the like, and the waste PET plastics are aminated and modified to be used as an additive of the recycled aggregate asphalt concrete, so that the adhesion between the recycled aggregate and asphalt is enhanced by using the aminolysis product of the waste PET, and the water damage resistance of the recycled aggregate asphalt concrete is improved. In order to realize the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of water damage-resistant recycled aggregate asphalt concrete comprises the following steps: (a) Modifying the recycled waste PET product by using triethylene tetramine to obtain modified PET; (b) Mixing the modified PET with molten asphalt to obtain PET modified asphalt; (c) Raw materials including recycled coarse aggregate, natural fine aggregate and natural mineral powder are mixed with PET modified asphalt to obtain the recycled aggregate asphalt concrete with water loss resistance.
Further, the step (a) is specifically operated as follows: and mixing triethylene tetramine and the waste PET product for aminolysis, and washing, drying and crushing the obtained mixture to obtain the modified PET with the particle size not more than 0.3mm.
Furthermore, the adding amount of the modified PET in the step (b) is equivalent to 1-3% of the mass of the asphalt.
Further, the asphalt selected in the step (b) is 70# base asphalt, and the asphalt is heated to 150-160 ℃ for melting.
Further, the addition amounts of the recycled coarse aggregate, the natural fine aggregate and the natural mineral powder in the step (c) are respectively 7-8 times, 9-10 times and 0.5-1 time of the mass of the PET modified asphalt.
Further, the recycled coarse aggregate in the step (c) is continuous graded coarse aggregate formed by crushing waste concrete, and the particle size of the continuous graded coarse aggregate is 4.75-16 mm.
Further, the natural fine aggregate in the step (c) is continuous graded fine aggregate formed by crushing limestone macadam, and the particle size of the continuous graded fine aggregate is 0.075mm-4.75mm.
Further, the natural mineral powder in the step (c) is mineral powder obtained by crushing, grinding and screening limestone macadam, and the particle size of the mineral powder is not more than 0.075mm.
Further, the step (c) is specifically operated as follows: firstly, drying the aggregate at 160-170 ℃ for at least 2h, and then mixing the aggregate with molten PET modified asphalt and mineral powder at 150-160 ℃.
The invention also aims to provide the asphalt concrete with the water damage-resistant recycled aggregate prepared by the method.
The invention replaces the graded natural coarse aggregate with the recycled coarse aggregate, fully utilizes the waste concrete aggregate, reduces the non-renewable natural aggregate consumption, and realizes the win-win situation of the recycling of building resources and environmental protection. The asphalt is modified by using the aminolysis product of the waste PET, so that the binding force between the recycled aggregate and the asphalt is enhanced, the anti-stripping property of the recycled aggregate asphalt concrete in a water-soaked environment is improved, the problem of poor water damage resistance of the recycled aggregate asphalt concrete is basically solved, and the application range of the recycled aggregate asphalt concrete is expanded. The popularization and the implementation of the technology of the invention not only can recycle a large amount of waste concrete aggregate and waste PET plastic to further relieve the problem of environmental pollution, but also greatly reduce the risk of rainwater-load damage to the recycled aggregate asphalt concrete pavement and prolong the service life of the pavement. The invention also has the advantages of simple process, easy industrial operation, high resource utilization rate and the like, and has very obvious economic, environmental and social benefits.
Drawings
FIG. 1 is a gradation curve of the mineral aggregate of the present invention.
Detailed Description
In order to fully understand the technical solutions and advantages of the present invention, those skilled in the art will further describe the following embodiments with reference to the accompanying drawings.
The information on each raw material used in the examples of the present invention and the comparative examples is as follows:
asphalt: 70# base asphalt, having a softening point of 47.2 ℃, a penetration of 67dmm at 25 ℃, an extensibility of more than 100cm at 15 ℃ and a Brookfield rotational viscosity of 0.47 pas at 135 ℃.
Regeneration of coarse aggregate: produced by Hubei Huidi renewable resources development and utilization Co., ltdRaw aggregate with particle size of 4.75-16 mm and apparent density of 2.74 g/cm -3 The crush value was 18.6%, and the water absorption was 0.88%. Drying the recycled coarse aggregate at 160-170 ℃ for at least 2 hours before mixing.
Natural fine aggregate: the natural limestone fine aggregate with continuous gradation has the grain diameter of 0.075mm-4.75mm and the apparent density of 2.69 g-cm -3 The firmness was 2.2% and the sand equivalent was 78.4%. Drying natural fine aggregate at 160-170 deg.C for at least 2 hr before mixing.
Mineral powder: is prepared by crushing and grinding natural limestone, and has particle diameter of no more than 0.075mm and apparent density of 2.76 g-cm -3 The hydrophilic coefficient is 0.66, and no aggregate agglomeration exists.
Modified PET additive: according to the method in the Production of a sustainable mechanical recycling of waste PET inter-rubber modified asphalit, fine powder is obtained after amination, drying and grinding treatment of the recycled waste PET plastic, and the particle size is not more than 0.3mm.
FIG. 1 is a grading curve chart of examples and comparative examples, which shows the relative contents of each particle group in coarse and fine aggregates, and more intuitively reflects the grading compositions of the examples and comparative examples.
Example 1
Heating the No. 70 matrix asphalt to a molten state at 150 ℃, adding a modified PET additive accounting for 1% of the mass of the asphalt, and stirring for 5min to obtain the PET modified asphalt.
52g of PET modified asphalt, 397.28g of recycled coarse aggregate, 510.64g of natural fine aggregate and 38g of natural mineral powder are weighed quantitatively. According to the designed mixing proportion, the PET modified asphalt which keeps heating, melting and flowing is mixed with aggregate and mineral powder at the temperature of 150 ℃ to obtain the water damage resistant recycled aggregate asphalt concrete.
In order to fully understand the properties of the recycled aggregate asphalt concrete, physical property tests were carried out on the 1wt% PET modified asphalt and its mixture according to the road engineering asphalt and asphalt mixture test protocol (JTJE 20-2011).
1wt% of the PET-modified asphalt had a softening point of 47.4 ℃ and a penetration of 65dmm at 25 ℃ and a Brookfield rotational viscosity of 0.49 pas at 135 ℃. The recycled aggregate asphalt concrete has the soaking Marshall stability residual ratio of 92.4 percent, the freeze-thaw splitting strength ratio of 84.8 percent and the splitting tensile strength of 0.92MPa, and completely meets the relevant requirements of the technical Specification for constructing asphalt road surfaces of roads. It can be seen that the recycled aggregate asphalt concrete doped with 1wt% of the modified PET additive has better resistance to water damage and resistance to damage.
Example 2
Example 2 is essentially the same as example 1, except that: in the recycled aggregate asphalt concrete, the addition amount of the modified PET additive is 2wt%.
The 2wt% PET modified asphalt had a softening point of 47.8 ℃, a penetration of 65dmm at 25 ℃ and a Brookfield rotational viscosity of 0.51 pas at 135 ℃ measured under the same test conditions. The soaking Marshall stability residual ratio of the recycled aggregate asphalt concrete is 93.6%, the freeze-thaw splitting strength ratio is 85.7%, and the splitting tensile strength is 1.16MPa, which completely meets the relevant requirements of the technical Specification for constructing asphalt road surfaces. Therefore, compared with the example 1, the addition of the modified PET additive in a certain range does not obviously improve the water damage resistance of the recycled aggregate asphalt concrete, but improves the resistance to damage.
Example 3
Example 3 is essentially the same as example 1, except that: in the recycled aggregate asphalt concrete, the addition amount of the modified PET additive is 3wt%.
The softening point of the PET-modified asphalt was 48.1 ℃ by 3% by weight, the penetration at 25 ℃ was 63dmm, and the Brookfield rotational viscosity at 135 ℃ was 0.55 pas, measured under the same test conditions. The soaking Marshall stability residual ratio of the recycled aggregate asphalt concrete is 94.0 percent, the freeze-thaw splitting strength ratio is 86.9 percent, and the splitting tensile strength is 1.33MPa, which completely meets the relevant requirements of the technical Specification for construction of road asphalt pavement. It can be seen that, compared with example 2, the addition of the modified PET additive does not improve the water damage resistance of the recycled aggregate asphalt concrete obviously, but the resistance to damage is still improved.
Comparative example 1
Comparative example 1 is substantially the same as example 1 except that: in the recycled aggregate asphalt concrete, the addition amount of the modified PET additive is 0 (namely, the modified PET additive is not added).
Under the same test conditions, the soaking Marshall stability residual ratio of the recycled aggregate asphalt concrete is 76.1 percent, the freeze-thaw splitting strength ratio is 71.4 percent, and the splitting tensile strength is 0.67MPa, which can not reach the relevant requirements of the technical Specification for constructing asphalt pavement for roads. Therefore, the recycled aggregate asphalt concrete prepared by directly adopting the unmodified matrix asphalt has lower soaking Marshall stability residue ratio, freeze-thaw splitting strength ratio and splitting tensile strength, and cannot meet the technical standard for pavement. To further illustrate the problems, the experimental results of the respective examples and comparative examples are shown in table 1.
TABLE 1 comparison table of test results of different recycled aggregate asphalt concretes
As can be seen from the above table, the recycled aggregate asphalt concrete without the modified PET additive in the comparative example 1 has the soaking Marshall strength ratio and the freeze-thaw splitting strength ratio of 76.1 percent and 71.4 percent respectively, which are respectively lower than 80 percent and 75 percent, and does not meet the relevant requirements of the technical Specification for the construction of road asphalt pavement on the water damage resistance of the asphalt concrete; and after 1-3% of the modified PET additive is doped in the examples 1-3, the soaking Marshall strength ratio and the freeze-thaw cleavage strength ratio of the recycled aggregate asphalt concrete are obviously improved, which shows that the modified PET additive has the capability of obviously improving the water damage resistance of the recycled aggregate asphalt concrete. In addition, the examples 1 to 3 also show that the increase of the mixing amount of the modified PET additive has no further obvious improvement effect on the soaking Marshall strength ratio and the freeze-thaw splitting strength ratio of the recycled aggregate asphalt concrete, but can obviously improve the splitting tensile strength. Therefore, the recycled aggregate asphalt concrete can obtain the effect of remarkably improving the water damage resistance and simultaneously enhancing the resistance to damage by only adopting 1 percent of modified PET additive, thereby showing remarkable economic benefit and engineering value.
Claims (8)
1. A preparation method of water damage resistant recycled aggregate asphalt concrete is characterized by comprising the following steps:
(a) Mixing triethylene tetramine and recycled waste PET products for aminolysis, and washing, drying and crushing the obtained mixture to obtain modified PET with the particle size not more than 0.3 mm;
(b) Mixing the modified PET with the molten asphalt to obtain PET modified asphalt, wherein the addition amount of the modified PET is 1-3% of the mass of the asphalt;
(c) Drying the recycled coarse aggregate and the natural fine aggregate at 160-170 ℃, and then mixing the dried recycled coarse aggregate and the natural fine aggregate with the molten PET modified asphalt and the mineral powder at 150-160 ℃ to obtain the recycled aggregate asphalt concrete with water loss resistance; the recycled coarse aggregate is continuous graded coarse aggregate formed by crushing waste concrete.
2. The method of claim 1, wherein: the asphalt selected in step (b) is 70# base asphalt, and is heated to 150-160 ℃ for melting.
3. The method of claim 1, wherein: in the step (c), the addition amounts of the recycled coarse aggregate, the natural fine aggregate and the natural mineral powder are respectively equal to 7-8 times, 9-10 times and 0.5-1 time of the mass of the PET modified asphalt.
4. The method of claim 1, wherein: the particle size of the recycled coarse aggregate in the step (c) is 4.75mm-16mm.
5. The method of claim 1, wherein: the natural fine aggregate in the step (c) is continuous graded fine aggregate formed by crushing limestone macadam, and the particle size of the continuous graded fine aggregate is 0.075mm-4.75mm.
6. The method of claim 1, wherein: the natural mineral powder in the step (c) is mineral powder obtained by crushing, grinding and screening limestone macadam, and the particle size of the mineral powder is not more than 0.075mm.
7. The method of claim 1, wherein: the drying time of step (c) is at least 2h.
8. The water damage resistant recycled aggregate asphalt concrete is characterized in that: the recycled aggregate asphalt concrete is prepared by the method of any one of claims 1 to 7.
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| CN106930167B (en) * | 2017-03-22 | 2019-03-26 | 泰州职业技术学院 | A kind of concrete debris regenerated aggregate warm-mixed asphalt thin overlay structure and its construction method |
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