CN110655349A - Asphalt pavement pit repairing capsule and preparation and construction method thereof - Google Patents

Abstract

The invention discloses a capsule for repairing a pit on an asphalt pavement and a preparation and construction method thereof, which are obtained by adopting a material which is easy to crack at high temperature as a shell and a mixture of asphalt and a heating medium as a core and wrapping the mixture by aggregate; the raw materials comprise, by mass, 7-12% of road petroleum asphalt, 7-12% of heating medium, 15-40% of alginate-calcium chloride polymer and 40-60% of aggregate. The asphalt mixture is encapsulated and transported in a bag, so that the energy consumption of the hot-mix asphalt mixture in the transportation process is saved, and the problem of poor storage stability is effectively solved. In addition, the construction method for repairing the pits in the asphalt concrete pavement by microwave or electromagnetic heating by combining the repairing capsules with the induction heating technology can realize quick repair and preventive maintenance of the asphalt concrete pavement on the premise of not reducing the road and mechanical properties, has good economical efficiency and prolongs the service performance of the asphalt pavement.

Description

Asphalt pavement pit repairing capsule and preparation and construction method thereof

Technical Field

The invention belongs to the technical field of asphalt pavement pit repairing, and particularly relates to an asphalt pavement pit repairing capsule and a preparation and construction method thereof.

Background

The pits are common diseases of asphalt pavements, the pavement pits not only affect the overall attractiveness of the road, but also affect the normal traffic of the road, so that the vehicle jolts, the driving speed and the comfort of passengers are affected, the vehicle is easy to have mechanical faults and damage, even traffic accidents are caused, and pits on a highway even possibly cause traffic accidents. Therefore, it is necessary to repair the potholes and damages of the road surface in time.

At present, a common material for repairing pit and groove diseases is a hot-mix asphalt mixture, when the pit and groove are repaired by the hot-mix asphalt mixture, the pit and groove needs to be transported to the site from a mixing station, and the temperature of the mixture is gradually reduced in the transportation process, so that the transportation distance has great influence on the repair time and the repair quality. Or the asphalt and aggregate need to be heated to 180 c and maintained at elevated temperatures to prevent the mixture from consolidating, but when maintained at elevated temperatures for extended periods of time during shipping and storage, the asphalt ages, its softening point and viscosity increases. This can result in a reduction in the quality of the asphalt mix and the quality of the repair, and requires a significant amount of energy to heat and maintain sufficient temperatures during transportation to maintain the asphalt binder in a liquid state and to maintain the asphalt pavement material in a viable state. Although the hot-mix asphalt mixture is feasible for the pavement maintenance with centralized sites and large engineering quantity, for the pavement maintenance with scattered sites and small engineering quantity, the factor quantity is too small, an asphalt mixing plant is difficult to produce, the hot-mix asphalt mixture is produced by 2-3 tons in batches in average each time, and only a small amount of asphalt mixture is needed for each pit slot in average, so that the condition of repairing material waste is caused, the construction season is short, and in addition, the construction unit is inconvenient for the heat preservation and repair operation of the hot-mix asphalt mixture.

Disclosure of Invention

The invention aims to provide an asphalt pavement pit repairing capsule and a preparation and construction method thereof, and aims to solve the key problems of high energy consumption and poor storage stability of a hot-mix asphalt mixture in transportation.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a bituminous paving hole groove repair capsule which characterized in that includes: the material shell which is easy to break at the temperature of more than or equal to 150 ℃ is wrapped with a mixture capsule core of asphalt and a heating medium, and the outside of the material shell which is easy to break at the temperature of more than or equal to 150 ℃ is provided with aggregate stone filler.

Preferably, the capsule for repairing the pit of the asphalt pavement comprises the following components: 7 to 12 weight percent of road petroleum asphalt, 7 to 12 weight percent of heating medium, 15 to 40 weight percent of alginate-calcium chloride polymer and 40 to 60 weight percent of aggregate.

Preferably, the shell of the material which is easy to crack at the temperature of more than or equal to 150 ℃ is alginate-calcium chloride polymer, and the core of the mixture capsule of the asphalt and the heating medium is a mixture of the road petroleum asphalt and the heating medium.

A preparation method of a bituminous pavement pit repairing capsule is characterized by comprising the following steps:

s1: adding a heating medium into the road petroleum asphalt, stirring and mixing at 170-180 ℃, and keeping for two minutes to ensure uniform mixing;

s2: placing the mixture obtained in the step 1 into a tray, and cooling at-15 to-5 ℃;

s3: preliminarily crushing the mixture cooled in the step 2 by hand, then crushing the mixture into irregular blocks with different sizes by using a hammer, and storing the irregular blocks in a container at the temperature of 2-10 ℃ to form the core of the capsule;

s4: mixing alginate and distilled water, and stirring with a stirring device at 400-500 rpm for 10-12 minutes to generate uniform emulsion; simultaneously mixing calcium chloride with distilled water to prepare calcium chloride solution

S5: adding the core into the alginate emulsion obtained in the step 4, and then adding into the calcium chloride solution to generate the ionic gel of the alginate on the surface of the core, wherein the reaction principle is that^wwCOO^-+Na+^wwCOO^-+Na+Ca²⁺→^wwCOO^-Ca^{2 +}-^-OOC^ww+2Na⁺Encapsulating the core in an alginate calcium chloride polymer shell;

s6: and (4) screening the substance obtained in the step (5) by using aggregate stone particles, then putting the screened substance into a dryer to be dried for 6-7 hours at the temperature of not less than 35 ℃, removing water and obtaining the asphalt pavement pit repairing capsule.

Preferably, the road petroleum asphalt in the step S1 is base asphalt or modified asphalt with the density not less than 1.00g/cm³。

Preferably, the heating medium in step S1 is one or more or all of steel wool, steel fiber and steel grit, ferrite, high-iron oxide fly ash, steel slag, carbon black, and magnetite ore, and the heating medium is suitable for electromagnetic heating and microwave heating, and has a diameter of 20-80 micrometers and a length of 0.15-5 mm.

Preferably, the alginate in step S4 is sodium alginate C₆H₇O₆Na。

Preferably, in the step S6, the aggregate stone particles are one or more of limestone, basalt and granite, and are graded continuously, and the maximum nominal particle size can be divided into three grades, which are 0.15-2.36 mm, 2.36-4.75 mm and 4.75-9.5 mm respectively. Capsules of three sizes, aiming at aggregates of different nominal grain sizes.

Preferably, the concentration of the alginate solution in the step S4 is 2 wt% to 3 wt%; the calcium chloride is anhydrous granular, the diameter is 3-9 mm, and the purity is 92% -95%; the concentration of the calcium chloride aqueous solution is 2 to 3 weight percent.

The construction method of the asphalt pavement pit repairing capsule is characterized by comprising the following steps:

s1: cleaning a pit: cleaning up sundries on the surface of the pit, and peripheral broken stones, waste residues and peeled objects, wherein the pit cannot contain sundries such as slurry, ice blocks and the like;

s2: edge spraying emulsified asphalt or epoxy resin: after the pit slot is cleaned, spraying emulsified asphalt or epoxy resin around and at the bottom of the pit slot;

s3: filling the pit groove: after scanning and analyzing the pits by an induction heating or microwave heating repairing vehicle provided with the asphalt pavement pit repairing capsules, selecting appropriate types of capsules and appropriate quantities of capsules to process and fill the pits;

s4: compacting: after the paving is uniform, a proper compacting tool and a proper compacting method are selected for compacting according to the field environment and the size and the depth of the repair area to meet the compacting requirement;

s5: cleaning: after compaction, uniformly spreading stone powder or fine sand on the surface, and sweeping back and forth by using a sweeping tool so as to fill the surface gaps with the fine sand;

s6: and (4) acceptance: the peripheral corners of the pit groove are compacted without loosening.

Compared with the prior art, the invention has the following beneficial effects:

1) compared with the common asphalt which needs to be stored in a heat preservation way and loaded and unloaded in time in the production and use processes, the encapsulation of the asphalt mixture is more stable, the storage performance of the asphalt mixture at normal temperature and in special climate is improved, the asphalt mixture is transported in a bag form, and the energy consumption of the asphalt mixture in the transportation process is saved;

2) meanwhile, the particles are packaged in a shell which is easy to crack at high temperature and are covered by aggregate stone filler, so that mutual adhesion of capsules can be prevented, and the problem of segregation of aggregate and asphalt can be effectively solved by encapsulation of the asphalt mixture;

3) through changing the gradation of the core of the capsule, the capsules of raw materials with different proportions can be prepared to repair the pits with different sizes and types, a user can optimize the types of the capsules and adjust the matching proportion of the capsules according to the sizes of the pits, and meanwhile, the pits in different layers are repaired, so that the applicability is wide, and the pertinence and the practicability are high.

4) The pit repairing capsules are combined with an induction heating or microwave heating technology to carry out induction repairing on the pits in the asphalt concrete pavement, so that the rapid repairing and preventive maintenance of the asphalt concrete pavement can be realized on the premise of not reducing the pavement and mechanical properties, the economy is good, and the service performance of the asphalt pavement is prolonged.

5) The invention improves the environmental protection index and the labor environment of workers by avoiding the treatment of hot materials and the emission of toxic smoke, and is suitable for repairing the pit slot on a small scale. And the rapid repairing technology is also favorable for accelerating the popularization and the application of the rapid repairing technology in the minor repair and maintenance of the local damage of the asphalt pavement.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a graph comparing road performance according to the present invention;

figure 3 is a typical grading diagram of the aggregate of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides the following technical solutions: the utility model provides a bituminous paving hole groove repair capsule which characterized in that includes: the material shell which is easy to break at the temperature of more than or equal to 150 ℃ is wrapped with a mixture capsule core of asphalt and a heating medium, and the outside of the material shell which is easy to break at the temperature of more than or equal to 150 ℃ is provided with aggregate stone filler.

Preferably, the capsule for repairing the pit of the asphalt pavement comprises the following components: 7 to 12 weight percent of road petroleum asphalt, 7 to 12 weight percent of heating medium, 15 to 40 weight percent of alginate-calcium chloride polymer and 40 to 60 weight percent of aggregate.

Preferably, the shell of the material which is easy to crack at the temperature of more than or equal to 150 ℃ is alginate-calcium chloride polymer, and the core of the mixture capsule of the asphalt and the heating medium is a mixture of the road petroleum asphalt and the heating medium.

A preparation method of a bituminous pavement pit repairing capsule is characterized by comprising the following steps:

s1: adding a heating medium into the road petroleum asphalt, stirring and mixing at 170-180 ℃, and keeping for two minutes to ensure uniform mixing;

s2: placing the mixture obtained in the step 1 into a tray, and cooling at-15 to-5 ℃;

s3: preliminarily crushing the mixture cooled in the step 2 by hand, then crushing the mixture into irregular blocks with different sizes by using a hammer, and storing the irregular blocks in a container at the temperature of 2-10 ℃ to form the core of the capsule;

s4: mixing alginate and distilled water, and stirring with a stirring device at 400-500 rpm for 10-12 minutes to generate uniform emulsion; simultaneously mixing calcium chloride with distilled water to prepare calcium chloride solution

S5: adding the core into the alginate emulsion obtained in the step 4, and then adding into the calcium chloride solution to generate the ionic gel of the alginate on the surface of the core, wherein the reaction principle is that^wwCOO^-+Na+^wwCOO^-+Na+Ca²⁺→^wwCOO^-Ca^{2 +}-^-OOC^ww+2Na⁺Encapsulating the core in an alginate calcium chloride polymer shell;

s6: and (4) screening the substance obtained in the step (5) by using aggregate stone particles, then putting the screened substance into a dryer to be dried for 6-7 hours at the temperature of not less than 30 ℃, removing water and obtaining the asphalt pavement pit repairing capsule.

Preferably, the road petroleum asphalt in the step S1 is base asphalt or modified asphalt with the density not less than 1.00g/cm³。

Preferably, the heating medium in step S1 is one or more or all of steel wool, steel fiber and steel grit, ferrite, high-iron oxide fly ash, steel slag, carbon black, and magnetite ore, and the heating medium is suitable for electromagnetic heating and microwave heating, and has a diameter of 20-80 micrometers and a length of 0.15-5 mm.

Preferably, the alginate in step S4 is sodium alginate C₆H₇O₆Na。

Preferably, in the step S6, the aggregate stone particles are one or more of limestone, basalt and granite, and are graded continuously, and the maximum nominal particle size can be divided into three grades, which are 0.15-2.36 mm, 2.36-4.75 mm and 4.75-9.5 mm respectively. Capsules of three sizes, aiming at aggregates of different nominal grain sizes.

Preferably, the concentration of the alginate solution in the step S4 is 2 wt% to 3 wt%; the calcium chloride is anhydrous granular, has the diameter of 6-7 mm and the purity of 92-95 percent; the concentration of the calcium chloride aqueous solution is 2 to 3 weight percent.

The construction method of the asphalt pavement pit repairing capsule is characterized by comprising the following steps:

s1: cleaning a pit: cleaning up sundries on the surface of the pit, and peripheral broken stones, waste residues and peeled objects, wherein the pit cannot contain sundries such as slurry, ice blocks and the like;

s2: edge spraying emulsified asphalt or epoxy resin: after the pit slot is cleaned, spraying emulsified asphalt or epoxy resin around and at the bottom of the pit slot;

s3: filling the pit groove: after scanning and analyzing the pits by an induction heating or microwave heating repairing vehicle provided with the asphalt pavement pit repairing capsules, selecting appropriate types of capsules and appropriate quantities of capsules to process and fill the pits;

s4: compacting: after the paving is uniform, a proper compacting tool and a proper compacting method are selected for compacting according to the field environment and the size and the depth of the repair area to meet the compacting requirement;

s5: cleaning: after compaction, uniformly spreading stone powder or fine sand on the surface, and sweeping back and forth by using a sweeping tool so as to fill the surface gaps with the fine sand;

s6: and (4) acceptance: the peripheral corners of the pit groove are compacted without loosening.

When the proportion of the added materials is different, the size and the application range of the obtained pit repairing capsules are different. According to the above method, small, medium, and large capsules can be prepared. When used for repairing mild pits, mini-capsules and mesocapsules are generally used, in a ratio of 3: 1-5: 1; when repairing a severe pit, a small, medium-sized and large-sized capsule is used, the proportion of which is 1: 1: 3-2: 3: 5;

example 1

In order to compare the pavement and mechanical properties of the asphalt pavement pit repairing capsule and the common asphalt mixture for pit repairing. Three asphalt mixes were tested in comparison. The test contents are tensile test, shear test and high-temperature rutting test respectively. In the three groups of experiments, the first group is a test piece made of a pit repairing capsule of the asphalt pavement; the second group is HMA2 type test pieces, the raw material is asphalt with the content of 8 percent, and the maximum nominal grain size of the aggregate is 2 mm; the third group is HMA10 type test pieces, the raw material is asphalt with the content of 5 percent, and the maximum nominal grain diameter of the aggregate is 10 mm. The test pieces are all prepared according to JTGE20-2011 test specification of road engineering asphalt and asphalt mixture, and the other experimental conditions are the same. Fig. 3 is a schematic diagram of a typical gradation of a capsule.

And the mass percentage of the asphalt pavement pit repairing capsules is as follows: 7.5 percent of road petroleum asphalt, 7.5 percent of steel wool, 30 percent of alginate-calcium chloride polymer and 55 percent of aggregate.

The capsule prepared by the method can be used for repairing larger pits.

As shown in fig. 2, the test results show that the ratio of the tensile strength to the shear strength of the test pieces of HMA2 and HMA10 types to the test pieces prepared from the asphalt pavement pit repairing capsules is less than 1, and the ratio of the dynamic stability is approximately equal to 1, which indicates that the tensile strength and the shear strength of the test pieces prepared from the asphalt pavement pit repairing capsules are significantly better than those of the test pieces of HMA2 and HMA10 types although the high-temperature anti-rutting capability is slightly inferior to that of the test pieces of HMA2 and HMA10 types. The pit repairing capsule has good road use and mechanical properties.

Example 2

The materials and related tests of this example were the same as in example 1.

10% of road petroleum asphalt, 10% of steel wool, 35% of alginate-calcium chloride polymer and 45% of aggregate.

The capsule prepared by the method can be used for repairing pits with general sizes.

The test piece prepared by the asphalt pavement pit repairing capsule prepared by the method is used for manufacturing a corresponding test piece, and a related evaluation test is carried out, so that the test piece prepared by the asphalt pavement pit repairing capsule has slightly poorer high-temperature anti-rutting capability than HMA2 and HMA10 test pieces, but has obviously better tensile strength and shear strength than HMA2 and HMA10 test pieces. The pit repairing capsule has good road use and mechanical properties.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides a bituminous paving hole groove repair capsule which characterized in that includes: the material shell easy to break at the temperature of more than or equal to 150 ℃ is wrapped with a mixture capsule core of asphalt and a heating medium, and aggregate stone filler is arranged on the outer side of the material shell which breaks at the high temperature.

2. The capsule for repairing pits in an asphalt pavement according to claim 1, wherein: the asphalt pavement pit repairing capsule comprises the following components: 7 to 12 weight percent of road petroleum asphalt, 7 to 12 weight percent of heating medium, 15 to 40 weight percent of alginate-calcium chloride polymer and 40 to 60 weight percent of aggregate.

3. The capsule for repairing pits in an asphalt pavement according to claim 1, wherein the shell of the material which is easy to crack at a temperature of 150 ℃ or higher is alginate-calcium chloride polymer, and the core of the capsule of the mixture of asphalt and a heating medium is a mixture of road petroleum asphalt and the heating medium.

4. A preparation method of a bituminous pavement pit repairing capsule is characterized by comprising the following steps:

s1: adding a heating medium into the road petroleum asphalt, stirring and mixing at 170-180 ℃, and keeping for two minutes to ensure uniform mixing;

s2: placing the mixture obtained in the step 1 into a tray, and cooling at-15 to-5 ℃;

s3: preliminarily crushing the mixture cooled in the step 2 by hand, then crushing the mixture into irregular blocks with different sizes by using a hammer, and storing the irregular blocks in a container at the temperature of 2-10 ℃ to form the core of the capsule;

s4: mixing alginate and distilled water, and stirring with a stirring device at 400-500 rpm for 10-12 minutes to generate uniform emulsion; simultaneously mixing calcium chloride with distilled water to prepare calcium chloride solution

S5: adding the core into the alginate emulsion obtained in the step 4, and then adding into the calcium chloride solution to generate the ionic gel of the alginate on the surface of the core, wherein the reaction principle is that^wwCOO^-+Na+^wwCOO^-+Na+Ca²⁺→^wwCOO^-Ca²⁺-^-OOC^ww+2Na⁺Encapsulating the core in an alginate calcium chloride polymer shell;

s6: and (4) screening the substance obtained in the step (5) by using aggregate stone particles, then putting the screened substance into a dryer to be dried for 6-7 hours at the temperature of more than or equal to 30 ℃, removing water and obtaining the asphalt pavement pit repairing capsule.

5. The preparation method of the capsule for repairing the pits on the asphalt pavement according to claim 4, wherein the capsule comprises the following steps: the road petroleum asphalt in the step S1 is matrix asphalt or modified asphalt with the density of more than or equal to 1.00g/cm³。

6. The preparation method of the capsule for repairing the pits on the asphalt pavement according to claim 4, wherein the capsule comprises the following steps: the heating medium in the step S1 is selected from steel wool, steel fiber, steel grit, ferrite, high-iron oxide fly ash, steel slag, carbon black and magnetite ore, or is selected from steel wool, steel fiber, steel grit, ferrite, high-iron oxide fly ash, steel slag, carbon black and magnetite ore, and the heating medium is suitable for electromagnetic heating and microwave heating, and has a diameter of 20-80 micrometers and a length of 0.15-5 millimeters.

7. The preparation method of the capsule for repairing the pits on the asphalt pavement according to claim 4, wherein the capsule comprises the following steps: alginate in the step S4 is sodium alginate C₆H₇O₆Na。

8. The preparation method of the capsule for repairing the pits on the asphalt pavement according to claim 4, wherein the capsule comprises the following steps: in the step S6, the aggregate stone particles are one or more of limestone, basalt and granite, and are graded continuously, and the maximum nominal particle size can be divided into three grades, namely 0.15-2.36 mm, 2.36-4.75 mm and 4.75-9.5 mm. Capsules of three sizes, aiming at aggregates of different nominal grain sizes.

9. The preparation method of the capsule for repairing the pits on the asphalt pavement according to claim 4, wherein the capsule comprises the following steps: the alginate aqueous solution concentration in the step S4 is 2 wt% -3 wt%; the calcium chloride is anhydrous granular, the diameter is 3-9 mm, and the purity is 92% -95%; the concentration of the calcium chloride aqueous solution is 2 to 3 weight percent.

10. The construction method of the asphalt pavement pit repairing capsule is characterized by comprising the following steps:

s1: cleaning a pit: cleaning up sundries on the surface of the pit, and peripheral broken stones, waste residues and peeled objects, wherein the pit cannot contain sundries such as slurry, ice blocks and the like;

s2: edge spraying emulsified asphalt or epoxy resin: after the pit slot is cleaned, spraying emulsified asphalt or epoxy resin around and at the bottom of the pit slot;

s3: filling the pit groove: after scanning and analyzing the pits by an induction heating or microwave heating repairing vehicle provided with the asphalt pavement pit repairing capsules, selecting appropriate types of capsules and appropriate quantities of capsules to process and fill the pits;

s4: compacting: after the paving is uniform, a proper compacting tool and a proper compacting method are selected for compacting according to the field environment and the size and the depth of the repair area to meet the compacting requirement;

s5: cleaning: after compaction, uniformly spreading stone powder or fine sand on the surface, and sweeping back and forth by using a sweeping tool so as to fill the surface gaps with the fine sand;

s6: and (4) acceptance: the peripheral corners of the pit groove are compacted without loosening.

Images