CN111592268B - Method for improving performance of foamed asphalt cold-recycling mixture by using water-based epoxy resin - Google Patents
Method for improving performance of foamed asphalt cold-recycling mixture by using water-based epoxy resin Download PDFInfo
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- CN111592268B CN111592268B CN202010474671.7A CN202010474671A CN111592268B CN 111592268 B CN111592268 B CN 111592268B CN 202010474671 A CN202010474671 A CN 202010474671A CN 111592268 B CN111592268 B CN 111592268B
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- foamed asphalt
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- 239000010426 asphalt Substances 0.000 title claims abstract description 109
- 239000000203 mixture Substances 0.000 title claims abstract description 86
- 238000004064 recycling Methods 0.000 title claims abstract description 51
- 239000003822 epoxy resin Substances 0.000 title claims abstract description 41
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 29
- 239000004568 cement Substances 0.000 claims abstract description 15
- 238000010276 construction Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 7
- 239000011707 mineral Substances 0.000 claims abstract description 7
- 239000000654 additive Substances 0.000 abstract description 3
- 230000000996 additive effect Effects 0.000 abstract description 3
- 239000012615 aggregate Substances 0.000 description 17
- 238000003860 storage Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 9
- 239000004570 mortar (masonry) Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 239000011083 cement mortar Substances 0.000 description 5
- 238000006116 polymerization reaction Methods 0.000 description 5
- 238000005187 foaming Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 229920000715 Mucilage Polymers 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000003776 cleavage reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000007017 scission Effects 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 239000012492 regenerant Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Images
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
- 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
- C04B24/281—Polyepoxides
-
- 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
Abstract
The invention belongs to the technical field of construction of foamed asphalt cold recycling pavements, and particularly relates to a method for improving the performance of a foamed asphalt cold recycling mixture by using water-based epoxy resin, which comprises the following steps: step 1, adding waterborne epoxy resin into water, stirring uniformly, and then adding into a mixing pot; and 2, adding mineral aggregate, cement and foamed asphalt into the mixing pot, and stirring to obtain the foamed asphalt cold-recycling mixture doped with the waterborne epoxy resin. According to the invention, the foamed asphalt cold recycling mixture is prepared by taking the water-based epoxy resin as the cold mixing additive, so that the high-temperature stability and the water loss resistance of the foamed asphalt cold recycling mixture can be effectively improved.
Description
Technical Field
The invention belongs to the technical field of construction of foamed asphalt cold recycling pavements, and particularly relates to a method for improving the performance of a foamed asphalt cold recycling mixture by using water-based epoxy resin.
Background
Foamed asphalt is a special asphalt material that is broken in a short time by injecting a certain amount of water into hot asphalt to expand its volume to form a large amount of asphalt foam. When the foamed asphalt contacts with aggregate, the asphalt foam is quickly changed into small particles which are scattered on the surface of fine aggregate (especially the particle size is less than 0.075mm) to form fine joint filling material adhered with a large amount of asphalt, and after mixing and compacting, the fine materials can be filled in the gaps of wet cold coarse materials and play a role similar to mortar, so that the mixture is stabilized.
The traditional indexes for evaluating the foaming performance of asphalt are expansion rate and half-life: the expansion ratio is defined as the ratio of the maximum volume reached by the foamed bitumen to the original volume of the unfoamed bitumen; half-life refers to the time (in s) required for the foamed bitumen to reach half of the maximum volume. Cold regeneration tests of foamed asphalt of German Vietgen company show that in order to obtain a high-quality foamed asphalt mixture, the expansion rate is more than 15, and the half-life period is within 5-10 s. Foamed asphalt disposables have inferior wear resistance to hot mix asphalt mixtures, and therefore such materials are commonly used as base or sub-base layers. Foamed asphalt as a stabilizer or a regenerant can be used for disposing various materials, and foamed asphalt can be used for disposing from poor road building materials to recycled asphalt mixture (RAP) of planing and milling.
The addition of the admixture can effectively improve the cold regeneration mixing performance of the foamed asphalt, and the common admixture can be mixed with aggregate under the action of high temperature at present, so that the performance of the mixture can be improved only by adopting a mode of modifying matrix asphalt by the admixture, but the modified asphalt has the problems of reduced foaming performance and the like. The water-based epoxy resin (WER for short) is a high molecular compound, can generate polymerization reaction at room temperature to generate a thermosetting material with a three-dimensional network structure, can effectively make up for the defects of insufficient high-temperature stability and the like of asphalt, and the polymerization product of the water-based epoxy resin obviously improves the bonding property and the frost resistance of cement mortar. Therefore, WER is gradually used as a modifier of an emulsified asphalt cold-mixing material in recent years and achieves better effect, but the application of the WER in a foamed asphalt cold-recycling mixture is not developed at home and abroad.
The prior art includes the following problems: 1. the foamed asphalt cold-recycling mixture has low asphalt content, only can wrap partial fine aggregates to form asphalt mucilage, and is distributed in the mixture in a spot welding mode, and at the moment, the cold-recycling mixture mainly comprises three parts: firstly, a skeleton structure formed by piling up coarse aggregate particles; secondly, asphalt mucilage formed by wrapping the fine aggregate with the foamed asphalt is distributed in a dotted manner; thirdly, the fine aggregates which are not coated by the asphalt are filled among the skeleton aggregates in a loose state (as shown in the left side of the figure 1), so that more gaps exist in the mixture, the loose fine aggregates are easy to lose under the action of water, weak chemical bonds of active ingredients such as RAP are weakened, and the tensile property and the water damage resistance of the mixture are reduced.
2. Asphalt is a thermoplastic material, the temperature of a regeneration layer is close to the asphalt softening point under the high-temperature condition in summer, the asphalt viscosity is reduced at the moment, the cohesive force of foamed asphalt mortar is reduced, the lubrication action among aggregates is intensified, the asphalt mortar subjected to simple spot welding can flow rapidly, unstable ruts are generated, and the high-temperature stability of the foamed asphalt cold-regeneration mixture is reduced.
3. The foamed asphalt cold-recycling mixture (as shown in the right side of the figure 1) after the cement is added, the cement can wrap part of the loose fine aggregate to form cement mortar to play a role in bonding and filling, cement hydration products and the foamed asphalt mortar are interwoven to form a space three-dimensional structure, the cement mortar and the asphalt mortar on a damage path jointly provide resistance, the high-temperature stability and the compactness of the cementing material are effectively improved, the internal pore distribution of the mixture can be changed by adding the cement, the internal pore distribution of the mixture is more uniform, water is prevented from entering the mixture, and the water stability of the mixture is effectively improved. However, the low temperature and fatigue performance of the mixture can be seriously affected by too high mixing amount of the cement, so that the consumption of the cement is limited, and the mixture still has the problems of insufficient high temperature stability and water loss resistance and the like.
4. The performance of the foamed asphalt cold-recycling mixture can be improved by adding the external admixture, the common external admixture and the mixture form an organic whole under the action of high-temperature melting at present, and if the external admixture is added in a mode of modifying matrix asphalt, the modified asphalt has the problems of reduced foaming performance and the like. Therefore, the finding of the external admixture for improving the performance of the foamed asphalt cold recycling mixture by adopting a cold mixing mode has important significance.
The above problems occur in the use and construction process of the foamed asphalt cold recycling mixture, and the operability and the economical efficiency of the construction process need to be considered in the road construction process. In terms of improving the performance of the foamed asphalt cold recycling mixture, an effective cold mixing additive and an adding process thereof are not available.
Disclosure of Invention
The present invention is made to solve the above problems, and an object of the present invention is to provide a method for improving the performance of a cold-recycling mix for foamed asphalt with an aqueous epoxy resin.
The invention provides a method for improving the performance of a cold recycling mixture of foamed asphalt by using a water-based epoxy resin, which is characterized by comprising the following steps of: step 1, adding waterborne epoxy resin into water, stirring uniformly at room temperature, and then adding into a mixing pot; and 2, adding mineral aggregate, cement and foamed asphalt into the mixing pot, and stirring at room temperature to obtain the foamed asphalt cold-recycling mixture doped with the waterborne epoxy resin.
The method for improving the performance of the foamed asphalt cold recycling mixture by the waterborne epoxy resin provided by the invention can also have the following characteristics: wherein the mixing amount of the water-based epoxy resin in the foamed asphalt cold recycling mixture is 1.5 percent.
The method for improving the performance of the foamed asphalt cold recycling mixture by the waterborne epoxy resin provided by the invention can also have the following characteristics: wherein, when the construction temperature is normal temperature, the foamed asphalt cold-recycling mixture is used within 45min, and when the construction temperature is lower or higher, the foamed asphalt cold-recycling mixture is used within 30 min.
Action and Effect of the invention
According to the method for improving the performance of the foamed asphalt cold recycling mixture by using the waterborne epoxy resin, which is disclosed by the invention, the foamed asphalt cold recycling mixture is prepared by using the waterborne epoxy resin as a cold-mixing external additive, so that the high-temperature stability and the water loss resistance of the foamed asphalt cold recycling mixture can be effectively improved.
Drawings
FIG. 1 is a schematic microstructure of a conventional foamed asphalt cold mix in an embodiment of the present invention;
FIG. 2 is a schematic flow diagram of a method for enhancing the performance of a cold-recycling mix for foamed asphalt with an aqueous epoxy resin in an embodiment of the present invention;
FIG. 3 is a schematic microstructure of a foamed asphalt cold-mix incorporating an aqueous epoxy resin according to an embodiment of the present invention;
FIG. 4 is a comparison of the appearance of test pieces with 1.5% and 0% of aqueous epoxy resin in examples of the present invention;
FIG. 5 is an ITSR, void fraction and dynamic stability of a foamed asphalt cold-recycled mix with different incorporation patterns and amounts of aqueous epoxy resin in an example of the present invention;
FIG. 6 is a curing process of a waterborne epoxy resin at different storage temperatures in an embodiment of the present invention;
FIG. 7 is a graph of the dynamic stability and ITSR of a foamed asphalt cold-mix at various storage times and storage temperatures in examples of the invention.
Detailed Description
In order to make the technical means and functions of the present invention easy to understand, the present invention is specifically described below with reference to the embodiments and the accompanying drawings.
FIG. 2 is a schematic flow diagram of a method for enhancing the performance of a cold-recycling mix for foamed asphalt with an aqueous epoxy resin in an embodiment of the present invention.
As shown in fig. 2, this example provides a method for improving the performance of a cold-recycling mixture of foamed asphalt with a water-based epoxy resin, which includes the following steps:
step 1, adding the waterborne epoxy resin into water, stirring uniformly at room temperature, and then adding into a mixing pot.
The stirring time in the step 1 is 10s-20 s.
And 2, adding mineral aggregate, cement and foamed asphalt into the mixing pot, and stirring at room temperature to obtain the foamed asphalt cold-recycling mixture doped with the waterborne epoxy resin.
In the embodiment, the stirring speed of the mixing pot is 60rad/min, mineral aggregate and cement are added into the mixing pot according to the proportion in the step 2, water is sprayed into the mixing pot, the mixture is stirred for 5-10 s, foamed asphalt is sprayed into the mixing pot, and finally the mixture is stirred for 10-20 s, so that the foamed asphalt cold recycling mixture doped with the water-based epoxy resin is obtained.
In the embodiment, the Waterborne Epoxy Resin (WER) can be subjected to polymerization reaction at room temperature to generate a three-dimensional network structure, so that the defects of insufficient high-temperature stability and the like of asphalt can be effectively overcome, and the cracking resistance of cement mortar can be improved by a polymerization product of the waterborne epoxy resin.
FIG. 3 is a schematic microstructure of a foamed asphalt cold mix incorporating an aqueous epoxy resin according to an embodiment of the present invention.
As shown in fig. 3, the principle of WER improving the performance of the foamed asphalt cold recycling mixture is as follows: firstly, in the process of mixing the mixture, the WER can independently wrap loose fine aggregates to form epoxy resin mucilage, and a polymerization product with strong cohesiveness and high compactness is generated along with the evaporation of water. Secondly, the WER can fill larger gaps of cement mortar, so that the number of the gaps is reduced, and the structural compactness is improved; and a proper amount of WER can form a cross-linked structure in the foamed asphalt mortar, has interlocking and reinforcing effects on asphalt particles and the mortar, and can improve the compactness and stability of the asphalt mortar (as shown in figure 4). Therefore, the WER can be used as an ideal modifier for improving the pavement performance of the foamed asphalt cold recycling mixture.
In this embodiment, three different adding modes of WER are also compared: the method 1 is that WER is prepared first, and then the WER, mineral aggregate, cement, asphalt and water are added into a mixing pot; adding the prepared WER into water, uniformly stirring, and adding the WER, the mineral aggregate, the cement and the asphalt into a mixing pot; and the mode 3 is that the prepared WER is added into the mixture and stirred uniformly when the production of the foamed asphalt cold recycling mixture is finished.
FIG. 5 is a graph showing the ITSR, porosity and dynamic stability of a foamed asphalt cold-recycled mix in examples of the present invention at different modes and amounts of incorporation of the aqueous epoxy resin.
As shown in fig. 5, the optimal blending process is obtained as mode 2 under the condition of ensuring the consistency of the total blending time of the three blending modes.
In this embodiment, on the basis of considering the performance improvement effect and the economical efficiency of the WER on the asphalt cement, the water stability of the WER corresponding to the foamed asphalt cold-recycling mixture at four doping amounts of 0.5%, 1.0%, 1.5% and 2.0% (by forming and maintaining a standard marshall test piece of the foamed asphalt cold-recycling mixture, the void ratio of the test piece is tested and the cleavage test is performed, the water loss resistance of the mixture is represented by the dry-wet cleavage strength ratio) and the high temperature stability (by forming and maintaining a rut test piece, the rut test at 60 ℃ is performed, the high temperature stability of the mixture is represented by the dynamic stability), and finally the doping amount of the water-based epoxy resin in the foamed asphalt cold-recycling mixture is 1.5%.
In this embodiment, the performance analysis of the foamed asphalt cold-recycling mixture is performed at different storage times and storage temperatures, and the specific process is as follows: the temperature has great influence on the WER curing reaction speed (as shown in figure 6), the cement hydration speed and the plasticity of the foamed asphalt mortar. Because the construction temperature difference in different seasons is large, when the influence of the storage time on the performance of the mixture is analyzed, the temperature of the mixture during storage needs to be considered, and therefore the storage temperatures of 20 ℃, 30 ℃ and 40 ℃ are set according to common construction temperatures to carry out dry and wet splitting tests.
FIG. 7 is a graph of the dynamic stability and ITSR of a foamed asphalt cold-mix at various storage times and storage temperatures in examples of the invention.
As shown in FIG. 7, the water damage resistance and the high temperature stability of the mixture decrease with the increase of the storage time, wherein the water damage resistance of the mixture decreases to a small extent within 30min, and after 45min, the water damage resistance of the mixture decreases to a large extent when the storage temperature is 20 ℃ and 40 ℃, even the mixture does not meet the requirement of the specification limit. Therefore, in order to fully exert the improvement effect of WER, the prepared foamed asphalt cold-recycling mixture is recommended to be conveyed to the site for paving and compacting within 45min at normal temperature, and when the construction temperature is lower or higher, the transportation time is preferably controlled within 30 min.
The mixture water loss resistance of the foamed asphalt cold recycling mixture prepared by the method for improving the performance of the foamed asphalt cold recycling mixture through the waterborne epoxy resin can be improved by about 10%, the high-temperature stability is respectively improved by 30-50%, the asphalt foaming performance under the preparation method is not affected, and the operability is very high in the construction process.
Effects and effects of the embodiments
According to the method for improving the performance of the foamed asphalt cold recycling mixture by using the waterborne epoxy resin, the foamed asphalt cold recycling mixture is prepared by using the waterborne epoxy resin as a cold mixing admixture, so that the high-temperature stability and the water loss resistance of the foamed asphalt cold recycling mixture can be effectively improved.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (1)
1. A method for improving the performance of a cold recycling mixture of foamed asphalt by using water-based epoxy resin is characterized by comprising the following steps:
step 1, adding waterborne epoxy resin into water, stirring uniformly at room temperature, and then adding into a mixing pot;
step 2, adding mineral aggregate, cement and foamed asphalt into the mixing pot, stirring at room temperature to obtain a foamed asphalt cold-recycling mixture doped with the waterborne epoxy resin,
the mixing amount of the water-based epoxy resin in the foamed asphalt cold recycling mixture is 1.5 percent,
when the construction temperature is normal temperature, the foamed asphalt cold-recycling mixture is used within 45min,
when the construction air temperature is lower or higher, the foamed asphalt cold-recycling mixture is used within 30 min.
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| CN202010474671.7A CN111592268B (en) | 2020-05-29 | 2020-05-29 | Method for improving performance of foamed asphalt cold-recycling mixture by using water-based epoxy resin |
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| CN202010474671.7A CN111592268B (en) | 2020-05-29 | 2020-05-29 | Method for improving performance of foamed asphalt cold-recycling mixture by using water-based epoxy resin |
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| CN111592268B true CN111592268B (en) | 2022-03-25 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EA201001076A1 (en) * | 2008-03-24 | 2011-02-28 | Общество С Ограниченной Ответственностью "Уником" | MODIFIED COMPOSITION FOR ASPHALT-CONCRETE MIXTURES |
| CN103951323A (en) * | 2014-04-17 | 2014-07-30 | 交通运输部公路科学研究所 | Reinforced emulsified asphalt concrete for roads and preparation method of concrete |
| CN105347746A (en) * | 2015-12-03 | 2016-02-24 | 苏交科集团股份有限公司 | Foamed asphalt cold-recycling lime-fly-ash crush stone mixture and preparation method thereof |
| CN108585624A (en) * | 2018-05-30 | 2018-09-28 | 河南省大道路业有限公司 | A kind of water-soluble epoxy resin Cold Recycled Mixture with Emulsified Asphalt and preparation method thereof |
-
2020
- 2020-05-29 CN CN202010474671.7A patent/CN111592268B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EA201001076A1 (en) * | 2008-03-24 | 2011-02-28 | Общество С Ограниченной Ответственностью "Уником" | MODIFIED COMPOSITION FOR ASPHALT-CONCRETE MIXTURES |
| CN103951323A (en) * | 2014-04-17 | 2014-07-30 | 交通运输部公路科学研究所 | Reinforced emulsified asphalt concrete for roads and preparation method of concrete |
| CN105347746A (en) * | 2015-12-03 | 2016-02-24 | 苏交科集团股份有限公司 | Foamed asphalt cold-recycling lime-fly-ash crush stone mixture and preparation method thereof |
| CN108585624A (en) * | 2018-05-30 | 2018-09-28 | 河南省大道路业有限公司 | A kind of water-soluble epoxy resin Cold Recycled Mixture with Emulsified Asphalt and preparation method thereof |
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