Cold recycling asphalt mixture of asphalt concrete milling material, and preparation process and application thereof

Abstract

The application relates to an asphalt concrete milling material cold regeneration asphalt mixture in the technical field of road engineering, a preparation process and application thereof, the asphalt concrete milling material cold regeneration asphalt mixture comprising an A component and a B component; the A component comprises waste asphalt concrete milling material and a diluent; the B component comprises a tackifier, an adsorbent and a moisture adsorption solidifying agent. The preparation process can fully exert the residual asphalt binder performance of the waste asphalt concrete milling material, reduces the amount of newly added materials in the waste asphalt concrete milling material regeneration process, the formed asphalt concrete milling material cold regeneration asphalt mixture is convenient to construct, the maintenance forming time is controllable, and the operation is simple, economical and applicable.

Description

Technical Field

[0001] This application relates to the field of road engineering technology, and in particular to a cold recycled asphalt mixture for asphalt concrete milling and its preparation process and application. Background Technology

[0002] Currently, the construction of cities in developed regions around the world generates a large amount of waste asphalt concrete. Global infrastructure construction requires the consumption of a large amount of new building materials, and the production of these new building materials generates a large amount of carbon emissions. Recycling waste building materials can reduce carbon emissions, but current recycling technologies for waste asphalt concrete cannot fully utilize the performance of the waste asphalt concrete. Summary of the Invention

[0003] In view of the problems existing in the background technology, this application provides a cold recycled asphalt mixture of asphalt concrete milling material and its preparation process. The preparation process can give full play to the residual asphalt binder performance of waste asphalt concrete milling material, reduce the amount of new materials added during the recycling process of waste asphalt concrete milling material, and the resulting cold recycled asphalt mixture of asphalt concrete milling material is convenient to construct, has controllable curing time, and is simple, economical and applicable to operation.

[0004] According to a first aspect of the present invention, a cold recycled asphalt mixture of asphalt concrete milling material is provided, comprising component A and component B; said component A comprises waste asphalt concrete milling material and a diluent; said component B comprises a tackifier, an adsorbent and a moisture-absorbing curing agent.

[0005] In some embodiments of the present invention, the mass ratio of component A to component B is 47 to 147 to 3.

[0006] In some embodiments of the present invention, by mass percentage, component A contains 95%-98% waste asphalt concrete milling material and 2%-5% diluent;

[0007] Component B consists of 80% tackifier, 10% adsorbent, and 10% moisture-absorbing curing agent.

[0008] In some embodiments of the present invention, the diluent includes kerosene and base bitumen;

[0009] Preferably, the ratio of kerosene to base bitumen is 80:20 by mass.

[0010] In some embodiments of the present invention, the adsorbent is an oil-absorbing acrylic resin powder.

[0011] In some embodiments of the present invention, the thickener is rock pitch powder;

[0012] Preferably, the rock pitch powder has a fineness of 400 mesh.

[0013] According to a second aspect of the present invention, a method for preparing the above-mentioned cold recycled asphalt mixture of asphalt concrete milling material is provided, comprising: preparing component A by mixing waste asphalt concrete milling material and a diluent according to the designed proportion of component A, mixing until the diluent is evenly distributed; sealing and storing the mixed material until the waste asphalt milling material is completely dispersed under the action of the diluent to obtain component A; preparing component B by weighing a tackifier, an adsorbent, and a moisture adsorption curing agent according to the designed proportion of component B, mixing them evenly to obtain component B; taking component A and component B according to the designed proportion of cold recycled asphalt mixture of asphalt concrete milling material, mixing them evenly to obtain cold recycled asphalt mixture of asphalt concrete milling material.

[0014] In some embodiments of the present invention, the mixing time of component A and component B is 3 minutes.

[0015] In some embodiments of the present invention, the service life of the uniformly mixed asphalt concrete milling material cold recycled asphalt mixture does not exceed 2 hours.

[0016] According to a third aspect of the present invention, the application of the above-described asphalt concrete milling material cold recycled asphalt mixture in road maintenance is provided.

[0017] Compared with the prior art, the present invention achieves the following technical effects:

[0018] By using the preparation method of cold recycled asphalt mixture from milled asphalt concrete in this technical solution, and the composition of the cold recycled asphalt mixture from milled asphalt concrete, the residual asphalt binder performance of waste asphalt concrete can be fully utilized, reducing the amount of new materials added during the recycling process of waste asphalt concrete. The amount of new binder can be reduced by approximately 1%-2%. It can be mixed at room temperature, saving heating energy and being low-carbon and environmentally friendly. The prepared cold-mix cold-pave recycled asphalt mixture is used for pothole repair on municipal roads. After mixing and compaction, the curing time is short, and traffic can be opened in about 4 hours. It is simple, economical and practical to operate. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art will readily identify several non-critical parameters that can be varied or modified without yielding substantially the same results.

[0020] Unless otherwise specified, the techniques or conditions described in the examples shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels. Unless otherwise specified, the experimental methods in the following examples are conventional methods. Unless otherwise specified, the experimental materials used in the following examples are all commercially available products.

[0021] Example 1

[0022] (1) Preparation of component A

[0023] Waste asphalt concrete was milled from the old asphalt concrete pavement. A thinner was prepared by diluting the base asphalt with kerosene at a mass ratio of 80:20.

[0024] Weigh the waste asphalt concrete milled material according to the capacity of the drum mixer and set it aside; calculate the amount of diluent to be added according to the mass of the waste asphalt concrete milled material, and weigh the diluent for later use.

[0025] The weighed waste asphalt concrete milling material and diluent are mixed with a drum mixer. The total weight of the waste asphalt concrete milling material and diluent after mixing is 100%, of which the waste asphalt concrete milling material accounts for 95% and the diluent accounts for 5%. Mix until the diluent is evenly distributed.

[0026] The mixed materials are transported to a sealed storage warehouse and left to stand for a week. The waste asphalt milling material is completely dispersed under the action of the diluent, and the curing process is completed to obtain component A.

[0027] After the A component has completed its health-preserving and development process, it is divided into sealed packaging bags, each weighing 50 kg, and then transferred to the storage warehouse for later use.

[0028] (2) Preparation of component B

[0029] Rock bituminous minerals are processed into rock bituminous powder with a fineness of 400 mesh.

[0030] Weigh out rock bitumen powder, oil-absorbing acrylic resin powder, and ordinary Portland cement with a strength grade of 42.5. The total weight percentage after mixing is 100%, of which rock bitumen powder accounts for 80%, oil-absorbing acrylic resin powder accounts for 10%, and ordinary Portland cement accounts for 10%. Mix them evenly to obtain component B.

[0031] Component B was repackaged into sealed bags, 10 kg per bag, and then transferred to a storage warehouse for later use.

[0032] (3) Preparation of cold recycled asphalt mixture from milled asphalt concrete material

[0033] According to the design ratio and the mixing capacity of the mortar mixer, take the developed component A and the prepared component B. By mass percentage, the total mixing ratio of component A and component B is 100%, of which component A accounts for 94% and component B accounts for 6%. Use a small mortar mixer to mix for 3 minutes. After observing that the mixture is uniform, stop mixing and set aside. The mixed asphalt concrete milled material cold recycled asphalt mixture must be used within 2 hours.

[0034] Example 2

[0035] (1) Preparation of component A

[0036] Waste asphalt concrete was milled from the old asphalt concrete pavement. A thinner was prepared by diluting the base asphalt with kerosene at a mass ratio of 80:20.

[0037] Weigh the waste asphalt concrete milled material according to the capacity of the drum mixer and set it aside; calculate the amount of diluent to be added according to the mass of the waste asphalt concrete milled material, and weigh the diluent for later use.

[0038] The weighed waste asphalt concrete milling material and diluent are mixed with a drum mixer. The total weight of the waste asphalt concrete milling material and diluent after mixing is 100%, of which the waste asphalt concrete milling material accounts for 98% and the diluent accounts for 2%. Mix until the diluent is evenly distributed.

[0039] The mixed materials are transported to a sealed storage warehouse and left to stand for a week. The waste asphalt milling material is completely dispersed under the action of the diluent, and the curing process is completed to obtain component A.

[0040] After the A component has completed its health-preserving and development process, it is divided into sealed packaging bags, each weighing 50 kg, and then transferred to the storage warehouse for later use.

[0041] (2) Preparation of component B

[0042] Rock bituminous minerals are processed into rock bituminous powder with a fineness of 400 mesh.

[0043] Weigh out rock bitumen powder, oil-absorbing acrylic resin powder, and ordinary Portland cement with a strength grade of 42.5. The total weight percentage after mixing is 100%, of which rock bitumen powder accounts for 80%, oil-absorbing acrylic resin powder accounts for 10%, and ordinary Portland cement accounts for 10%. Mix them evenly to obtain component B.

[0044] Component B was repackaged into sealed bags, 10 kg per bag, and then transferred to a storage warehouse for later use.

[0045] (3) Preparation of cold recycled asphalt mixture from milled asphalt concrete material

[0046] According to the design ratio and the mixing capacity of the mortar mixer, take the developed component A and the prepared component B. By mass percentage, the total mixing ratio of component A and component B is 100%, of which component A accounts for 98% and component B accounts for 2%. Use a small mortar mixer to mix for 3 minutes. After observing that the mixture is uniform, stop mixing and set aside. The mixed asphalt concrete milled material cold recycled asphalt mixture must be used within 2 hours.

[0047] Example 3

[0048] (1) Preparation of component A

[0049] Waste asphalt concrete was milled from the old asphalt concrete pavement. A thinner was prepared by diluting the base asphalt with kerosene at a mass ratio of 80:20.

[0050] Weigh the waste asphalt concrete milled material according to the capacity of the drum mixer and set it aside; calculate the amount of diluent to be added according to the mass of the waste asphalt concrete milled material, and weigh the diluent for later use.

[0051] The weighed waste asphalt concrete milling material and diluent are mixed with a drum mixer. The total weight of the waste asphalt concrete milling material and diluent after mixing is 100%, of which the waste asphalt concrete milling material accounts for 97% and the diluent accounts for 3%. The mixture is mixed until the diluent is evenly distributed.

[0052] The mixed materials are transported to a sealed storage warehouse and left to stand for a week. The waste asphalt milling material is completely dispersed under the action of the diluent, and the curing process is completed to obtain component A.

[0053] After the A component has completed its health-preserving and development process, it is divided into sealed packaging bags, each weighing 50 kg, and then transferred to the storage warehouse for later use.

[0054] (2) Preparation of component B

[0055] Rock bituminous minerals are processed into rock bituminous powder with a fineness of 400 mesh.

[0056] Weigh out rock bitumen powder, oil-absorbing acrylic resin powder, and ordinary Portland cement with a strength grade of 42.5. The total weight percentage after mixing is 100%, of which rock bitumen powder accounts for 80%, oil-absorbing acrylic resin powder accounts for 10%, and ordinary Portland cement accounts for 10%. Mix them evenly to obtain component B.

[0057] Component B was repackaged into sealed bags, 10 kg per bag, and then transferred to a storage warehouse for later use.

[0058] (3) Preparation of cold recycled asphalt mixture from milled asphalt concrete material

[0059] According to the design ratio and the mixing capacity of the mortar mixer, take the developed component A and the prepared component B. By mass percentage, the total mixing ratio of component A and component B is 100%, of which component A accounts for 96% and component B accounts for 4%. Use a small mortar mixer to mix for 3 minutes. After observing that the mixture is uniform, stop mixing and set aside. The mixed asphalt concrete milled material cold recycled asphalt mixture must be used within 2 hours.

[0060] Test case

[0061] Test basis:

[0062] (1) Cold patching material for potholes in asphalt pavement (JT / T 972-2015)

[0063] (2) Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011)

[0064] Specimen molding method:

[0065] According to the requirements in section 5.3.2 of the Cold Patching Material for Potholes in Asphalt Pavement (JT / T 972-2015), double-sided compaction was carried out according to T0702-2011 of the Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering (JTG E20-2011). The first compaction was 37 times, and after curing for 24 hours, it was compacted again 38 times, for a total of 75 times, to prepare standard Marshall specimens.

[0066] Test method:

[0067] According to the requirements in section 5.3.2 of "Cold Patching Material for Potholes in Asphalt Pavement" (JT / T 972-2015), a constant temperature water bath of 25℃ was used, and Marshall stability and residual stability tests were conducted according to the requirements of T0709-2011 of the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011).

[0068] Table 1. Experimental Results of Example 1:

[0069]

[0070] Table 2 Example 2 - Experimental Results:

[0071]

[0072] Table 3 Example 3 - Experimental Results:

[0073]

[0074] According to the test results in Tables 1-3, the cold recycled asphalt mixture for milled asphalt concrete of this application meets the technical requirements of cold patch material for potholes in asphalt pavement (JT / T 972-2015) in terms of Marshall stability, water immersion Marshall stability and residual stability, and has excellent performance. In some aspects, it even meets the standards far exceeding the technical requirements.

[0075] The present invention relates to the formulation and preparation of cold-mix recycled asphalt mixture from milled asphalt concrete. This method fully utilizes the residual asphalt binder properties of waste asphalt concrete, reducing the amount of new materials added during the recycling process by approximately 1%-2%. It can be mixed at room temperature, saving heating energy and promoting low-carbon environmental protection. Furthermore, the prepared cold-mix cold-lay recycled asphalt mixture is suitable for pothole repair on municipal roads. After mixing and compaction, it has a short curing time, allowing traffic to resume in approximately 4 hours. The method is simple, economical, and practical.

[0076] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for preparing cold recycled asphalt mixture from milled asphalt concrete, characterized in that, include: Component A is prepared by mixing waste asphalt concrete milled material and diluent according to the designed proportion of Component A, mixing until the diluent is evenly distributed; the mixed material is then sealed and left to stand until the waste asphalt milled material is completely dispersed under the action of the diluent, thus obtaining Component A; by mass percentage, the waste asphalt concrete milled material accounts for 95%-98% of Component A, and the diluent accounts for 2%-5%, wherein the diluent includes kerosene and base asphalt. Component B is prepared by weighing the tackifier, adsorbent, and moisture-absorbing curing agent according to the designed proportions of Component B, mixing them evenly, and obtaining Component B. By mass percentage, Component B contains 80% tackifier, 10% adsorbent, and 10% moisture-absorbing curing agent. The adsorbent is oil-absorbing acrylic resin powder, the tackifier is rock pitch powder, and the moisture-absorbing curing agent is ordinary Portland cement with a strength grade of 42.

5. Take component A and component B according to the design ratio of cold recycled asphalt mixture for milled asphalt concrete, mix them evenly to obtain cold recycled asphalt mixture for milled asphalt concrete; by mass ratio, component A: component B is 47 to 147:

3.

2. The preparation method according to claim 1, characterized in that, The mixing time for components A and B is 3 minutes.

3. The preparation method according to claim 1, characterized in that, The service life of the uniformly mixed asphalt concrete milling material and cold recycled asphalt mixture shall not exceed 2 hours.

4. The preparation method according to claim 1, characterized in that, The diluent contains kerosene to base bitumen in a mass ratio of 80:

20.

5. The preparation method according to claim 1, characterized in that, The rock asphalt powder has a fineness of 400 mesh.

6. The application of the asphalt concrete milling material cold recycled asphalt mixture prepared by the preparation method according to any one of claims 1-5 in road maintenance.

Images