CN113931037A - Construction process for intermittent foamed asphalt regenerated base layer - Google Patents
Construction process for intermittent foamed asphalt regenerated base layer Download PDFInfo
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- CN113931037A CN113931037A CN202111209573.1A CN202111209573A CN113931037A CN 113931037 A CN113931037 A CN 113931037A CN 202111209573 A CN202111209573 A CN 202111209573A CN 113931037 A CN113931037 A CN 113931037A
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- stirring
- asphalt
- time
- intermittent
- foamed asphalt
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- 239000010426 asphalt Substances 0.000 title claims abstract description 93
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000002156 mixing Methods 0.000 claims abstract description 58
- 238000003756 stirring Methods 0.000 claims abstract description 56
- 239000004568 cement Substances 0.000 claims abstract description 8
- 238000012216 screening Methods 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 33
- 238000005187 foaming Methods 0.000 claims description 27
- 238000004064 recycling Methods 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 238000007580 dry-mixing Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 239000006260 foam Substances 0.000 claims description 3
- 230000008929 regeneration Effects 0.000 abstract description 12
- 238000011069 regeneration method Methods 0.000 abstract description 12
- 238000003801 milling Methods 0.000 description 7
- 238000011049 filling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000012492 regenerant Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1004—Reconditioning or reprocessing bituminous mixtures, e.g. salvaged paving, fresh patching mixtures grown unserviceable; Recycling salvaged bituminous mixtures; Apparatus for the in-plant recycling thereof
Abstract
The invention provides an intermittent foamed asphalt regeneration base layer construction process, which comprises the following steps: firstly, pre-screening milled materials, and configuring the screened milled materials into RAP materials; step two, stirring for the first time, namely sending the RAP material into a stirring station, and adding medium powder, new materials and cement into the stirring station for dry stirring, wherein the dry stirring time is T1; step three, stirring for the second time, injecting water into the mixing station, and then performing wet mixing for T2; and step four, stirring for the third time, namely adding foamed asphalt into the mixing station subjected to the second stirring for stirring, wherein the stirring time is T3.
Description
Technical Field
The invention relates to the technical field of construction of foamed asphalt recycled base layers, in particular to a construction process of an intermittent foamed asphalt recycled base layer.
Background
The foamed asphalt recycled base layer is a pavement layer formed by adopting foamed asphalt cold recycled mixture construction, and the construction production of the foamed asphalt cold recycled mixture at present mainly adopts a plant-mixed cold recycling machine for production; the existing plant-mixed cold recycling machine has the defect of low productivity which is only 220t/h, so that the project can not meet the requirement of workers in rainy period. On the other hand, the machine is provided with only two bins, one bin is usually added with old materials, the other one is added with new materials to improve the gradation, the two bins can not finish the requirements of water stabilizing materials on the gradation, and the machine can only be idle when cold recycled materials are not produced.
Disclosure of Invention
In view of the above problems, the application provides an intermittent foamed asphalt recycled base layer construction process, which can be used for producing a foamed asphalt cold-recycling mixture through construction, and can improve the production efficiency of the foamed asphalt cold-recycling mixture.
The invention provides an intermittent foamed asphalt regeneration base layer construction process, which comprises the following steps:
firstly, pre-screening milled materials, and configuring the screened milled materials into RAP materials;
step two, stirring for the first time, namely sending the RAP material into a stirring station, and adding medium powder, new materials and cement into the stirring station for dry stirring, wherein the dry stirring time is T1;
step three, stirring for the second time, injecting water into the mixing station, and then performing wet mixing for T2;
and step four, stirring for the third time, namely adding foamed asphalt into the stirring station subjected to the stirring for the second time for stirring, wherein the stirring time is T3.
Further, in the second step, the dry mixing time T1 is 3 seconds to 7 seconds.
Further, in the second step, the dry mixing time T1 is 5 seconds.
Further, in the third step, the wet mixing time T2 is 6 seconds to 10 seconds.
Further, in step three, the wet mixing time T2 is 8 seconds.
Further, in the fourth step, the stirring time T3 for the third stirring is 15 seconds to 20 seconds.
Further, in step four, the stirring time T3 for the third stirring was set to 17 seconds.
The invention further provides an intermittent foamed asphalt regeneration base layer construction process which comprises an intermittent foamed asphalt regeneration mixture production system, wherein the production system comprises the mixing station and an asphalt foaming device, and the mixing station is provided with a water adding device.
Furthermore, the water adding device comprises a first detection device, a control device and a control valve, wherein the first detection device is used for detecting the quality of materials in the mixing station, and the control device is used for acquiring the detection value of the first detection device to control the opening time of the control valve so as to control the water adding amount of the water adding device.
Further, the asphalt foaming device comprises an asphalt foaming pipe and a foamed asphalt spraying pipe communicated with the asphalt foaming pipe, the asphalt foaming pipe is further communicated with an asphalt supply device and a water supply device, and the foamed asphalt spraying pipe is communicated with the mixing station.
The invention provides a construction process of an intermittent foamed asphalt regeneration base layer, which can improve the production efficiency of a foamed asphalt cold regeneration mixture, improve the capacity of an intermittent mixing plant and meet the project driving requirements.
Secondly, a water adding device is arranged in the intermittent mixing station, so that water can be injected into the mixing station through the water adding device when the cold recycled mixture is produced, and the requirement of wet mixing is met; under the condition of not adding water, the ordinary asphalt mixture can be processed through an intermittent mixing station, and the dual-purpose function of one machine can be realized.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings.
FIG. 1 is a schematic flow chart of the construction process of an intermittent foamed asphalt recycled base layer provided by the invention.
FIG. 2 is a schematic structural diagram of the construction process of the intermittent foamed asphalt recycled base layer provided by the invention.
FIG. 3 is a schematic view of the asphalt foaming apparatus according to the present invention.
Fig. 4 is a schematic top view of fig. 3.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The invention provides an intermittent foamed asphalt recycled base layer construction process, which is a specific implementation mode and refers to a figure 1, and the construction process comprises the following steps:
firstly, pre-screening milled materials, and configuring the screened milled materials into RAP materials;
specifically, milling material refers to old material obtained by milling and recycling an old asphalt pavement, and RAP material refers to mixture obtained by sieving milling material and then mixing the milled material with a regenerant, a new asphalt material, a new aggregate and the like according to a certain proportion; because in the process of screening the milling material, the problem that the false grain size occurs when the grains are bonded together is easy to occur, the false grain size can cause that the surfaces of the grains cannot effectively wrap cement and asphalt, the performance of the mixture can be reduced, and in order to avoid the occurrence of the phenomenon, as a preferred embodiment, in the first step, the pre-screening of the milling material comprises the following steps: the asphalt pavement milling material is divided into 3-5 grade graded materials through multiple times of asphalt and stone stripping and fine screening separation, the false particle size problem of old materials can be effectively eliminated through screening of multiple grades, the RAP fine aggregate fine separation, the RAP material making and the aggregate making of the asphalt pavement and the asphalt pavement milling old material fine separation technology are realized, the quality fluctuation problem of a regenerated asphalt mixture and the fusion problem of new and old asphalt when the mixing amount of old materials in the regeneration technology is too high are effectively solved, and in-situ, large-proportion and high-performance regeneration can be realized.
Step two, stirring for the first time, namely sending the RAP material into a stirring station, and adding medium powder, new materials and cement into the stirring station for dry stirring, wherein the dry stirring time is T1; specifically, after the RAP material is configured, the RAP material is conveyed to a mixing station, powder, new materials and cement are added into the mixing station, the adding proportion of the powder, the new materials and the cement is added according to the proportion of the mixture configured in the prior art, then the mixing station is used for dry mixing for preset time T1, and then stirring is stopped, so that the materials inside the mixing station are preliminarily mixed.
Step three, stirring for the second time, injecting water into the mixing station, and then performing wet mixing for T2; specifically, add the water of preset volume in to the mixing station through the water installation, wherein add the water yield and add according to the volume of the interior material of mixing station, after adding appropriate amount of water, the water installation stops to add water, and mixing station secondary stirring is long T2, and the material in will mixing station is fully stirred with water.
And step four, stirring for the third time, namely adding foamed asphalt into the stirring station subjected to the stirring for the second time for stirring, wherein the stirring time is T3.
Further, in the second step, the dry mixing time T1 is 3 seconds to 7 seconds.
Further, in the second step, the dry mixing time T1 is 5 seconds.
Further, in the third step, the wet mixing time T2 is 6 seconds to 10 seconds.
Further, in step three, the wet mixing time T2 is 8 seconds.
Further, in the fourth step, the stirring time T3 for the third stirring is 15 seconds to 20 seconds.
Further, in step four, the stirring time T3 for the third stirring was set to 17 seconds.
Further, the invention provides an intermittent foamed asphalt regeneration base layer construction process which comprises an intermittent foamed asphalt regeneration mixture production system, wherein the production system comprises a mixing station 10 and an asphalt foaming device 12, and the mixing station 10 is provided with a water adding device 11.
Further, as a preferred embodiment, in the second step, the various materials added in the mixing station form a mixture, wherein the mass fraction of the RAP material in the mixture is 60% -80%, and the relative relationship between the mass fraction of the RAP material in the mixture and the strength of the formed foamed asphalt regeneration base layer is as follows:
the upper table shows the strength parameters of the pavement base layer prepared from the foaming asphalt regeneration mixture prepared by adding the RAP materials with different mass fractions into the mixture, wherein the compressive strength test is carried out by adopting a cylinder with the sample size of 100mm +/-2 mm and the sample height of 100mm +/-2 mm and adopting the loading rate of 2 mm/min; the test piece size adopted in the bending strength test is a prism trabecula with the length of 250mm +/-2.0 mm, the width of 30mm +/-2.0 mm and the height of 35mm +/-2.0 mm, the span is 200mm +/-0.5 mm, and the loading rate of 50mm/min is adopted; the test piece size that adopts during the splitting strength test does: the diameter is 100mm +/-2 mm, the width of the pressing strip is 12.7mm, and a loading rate of 40mm/min is adopted; as can be seen from the above table, when the mass fraction of the RAP material in the mixture is changed from 70% to 80%, all the strength indexes of the test piece made of the obtained foamed asphalt recycled mixture are obviously reduced, and from 70% to 50%, all the strength indexes of the test piece are improved, but the improvement is not obvious, so that as a preferred embodiment, the mass fraction of the RAP material in the mixture is 70%, when the mass fraction is 70%, the quality of the prepared foamed asphalt mixture can be ensured, the recycled material can be utilized to the maximum extent, and the effect of saving cost can be achieved.
Specifically, referring to fig. 2, the invention further provides an intermittent foamed asphalt recycled mixture production system, and particularly relates to an intermittent plant mixing cold recycling machine, which comprises an intermittent mixing station and a water adding device arranged at the intermittent mixing station; in prior art, cold recycling machine of plantmix that the cold recycling mixture of foam pitch mainly used was used at present only two feed bins, and a feed bin adds old material when using, and another adds new material in order to improve the gradation, but two feed bins can not accomplish the requirement to the steady material of water to the gradation, and equipment can only be idle when not producing cold recycling material, and wherein the mixing station of plantmix cold recycling machine is intermittent type formula mixing station, through mixing equipment is provided with the water filling device, through setting up water filling device 11, can produce cold recycling mixture under the water filling condition, can process ordinary bituminous mixture under the condition of not adding water to can realize a tractor serves two purposes, in step three, annotate water to mixing station and use water filling device 11 to add.
Further, the water adding device 11 comprises a first detection device 114, a control device 113 and a control valve 112, wherein the first detection device 114 is used for detecting the quality of the materials in the mixing station, and the control device is used for acquiring the detection value of the first detection device 114 to control the opening time of the control valve 112 so as to control the water adding amount of the water adding device.
Further, as a preferred embodiment, referring to fig. 2, the water adding device comprises a water supply system, wherein the water supply system comprises a water storage tank 110, and when in production, the water adding device pumps water to the mixing station 10 through a water pump 111, and a control valve 112 is arranged on a water pipe, wherein the control valve 112 is selected from an electromagnetic valve; thereby controlling means 113 can gather the detection numerical value of first detecting means 114 and acquire the quality of the inside material of mixing station, calculates the volume that needs to add water, then the opening time of control valve comes accurate control water addition volume, and wherein first detecting means can be weighing device, weighs the total mass of the inside mixture of mixing station through weighing device.
Furthermore, it can be understood that in the actual production process, the proportions of various materials such as medium powder, new materials and cement added into the mixing station are different according to different grades of the road surface, and the water addition amount is different when the proportions are different; as a preferred embodiment, the first detection means may also be a metering device provided at each feed conveyor, calculating the total mass of the materials in the mixing chamber by taking the amount supplied by each feed conveyor, and in this way the proportioning relationship between the various materials may be obtained.
Further, as a preferred embodiment, the control device 113 further includes a database, wherein the database records the water addition amount corresponding to the mixed materials with different mixture ratios, when the stirring operation is performed, the control device 113 first obtains the addition amount of each material, calculates the mixture ratio relationship of each material according to the addition amount of each material, then obtains the currently required water addition amount according to the content recorded in the database, and then controls the control valve 112 to open for water addition, wherein the water pump 111 can provide a constant water pressure, so that the water flow can add the water amount at a constant flow rate when the control valve is opened, and therefore, the water addition amount can be controlled by controlling the opening time of the control valve 112.
As a specific embodiment, referring to fig. 3 and 4, the asphalt foaming device 12 includes an asphalt foaming pipe 121 and a foamed asphalt spraying pipe 120 communicating with the asphalt foaming pipe, the asphalt foaming pipe 121 further communicates with an asphalt supply device 122 and a water supply device 123, and the foamed asphalt spraying pipe 120 communicates with the mixing station 10.
Specifically, referring to fig. 3 and 4, the asphalt foaming device 12 has a structure substantially identical to the operation principle and structure of a conventional asphalt foaming device, and includes an asphalt foaming pipe 121 and a foamed asphalt spraying pipe 120 communicating with the asphalt foaming pipe 121, and the asphalt foaming pipe 121 further communicates with an asphalt supply device 122 and a water supply device 123, and the operation principle thereof is as follows: the asphalt supply device supplies high-temperature asphalt to the foaming pipe, the water supply device supplies corresponding water according to the amount of the supplied asphalt, the water is in contact with the high-temperature asphalt in the foaming pipe and evaporates to expand and foam the asphalt, so that foamed asphalt is prepared, the expanded foamed asphalt enters the foamed asphalt injection pipe and is sprayed out through the injection port, the foamed asphalt injection pipe can be arranged at the position of the feed port of the mixing station, so that the foamed asphalt generated by the asphalt foaming device is injected in the mixing cavity of the mixing station, and then the mixture is stirred for 15-20 seconds through the mixing station, so that the foamed asphalt cold-recycling mixture can be prepared. As a specific embodiment, the asphalt foaming device can adopt FB30 warm mix asphalt foaming equipment.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (7)
1. An intermittent foamed asphalt regenerated base layer construction process is characterized by comprising the following steps:
firstly, pre-screening milled materials, and configuring the screened milled materials into RAP materials;
step two, stirring for the first time, namely sending the RAP material into a stirring station, and adding medium powder, new materials and cement into the stirring station for dry stirring, wherein the dry stirring time is T1;
step three, stirring for the second time, injecting water into the mixing station, and then performing wet mixing for T2;
and step four, stirring for the third time, namely adding foamed asphalt into the stirring station subjected to the stirring for the second time for stirring, wherein the stirring time is T3.
2. The construction process of the intermittent foamed asphalt recycling base layer according to claim 1, wherein in the second step, the dry mixing time T1 is 3 seconds to 7 seconds.
3. The construction process of the intermittent foamed asphalt recycling base layer according to claim 2, wherein in the third step, the wet mixing time T2 is 6-10 seconds.
4. The construction process of the intermittent foamed asphalt recycling base layer according to claim 2, wherein in the fourth step, the stirring time T3 of the third stirring is 15 seconds to 20 seconds.
5. The construction process of the intermittent foamed asphalt recycling base layer according to claim 4, characterized by comprising an intermittent foamed asphalt recycling mixture production system, wherein the production system comprises the mixing station and an asphalt foaming device (12), the mixing station is provided with a water adding device (11), and water is injected into the mixing station by using the water adding device (11) in the third step.
6. An intermittent foamed asphalt recycling base course construction process according to claim 5, characterized in that the water adding device (11) comprises a first detection device (114), a control device (113) and a control valve (112), the first detection device (114) is used for detecting the quality of materials in the mixing station, the control device (113) is used for obtaining the detection value of the first detection device (114) to control the opening time of the control valve (112) so as to control the water adding amount of the water adding device (11).
7. The process for constructing an intermittent asphalt foam base course according to claim 5, wherein the asphalt foaming device (12) comprises an asphalt foaming pipe (121) and a foamed asphalt spraying pipe (120) communicated with the asphalt foaming pipe (121), and the asphalt foaming pipe (121) is further communicated with an asphalt supply device (122) and a water supply device (123).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111209573.1A CN113931037A (en) | 2021-10-18 | 2021-10-18 | Construction process for intermittent foamed asphalt regenerated base layer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111209573.1A CN113931037A (en) | 2021-10-18 | 2021-10-18 | Construction process for intermittent foamed asphalt regenerated base layer |
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| CN113931037A true CN113931037A (en) | 2022-01-14 |
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| CN202111209573.1A Pending CN113931037A (en) | 2021-10-18 | 2021-10-18 | Construction process for intermittent foamed asphalt regenerated base layer |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101570950A (en) * | 2009-06-03 | 2009-11-04 | 河南通和高速公路养护工程有限责任公司 | Asphalt cool recycled cement gravel mixed in place train and method for construction |
| WO2018113266A1 (en) * | 2016-12-19 | 2018-06-28 | 江苏一诺路桥工程技术检测有限公司 | Foaming asphalt preparation device and usage method therefor |
| CN111576142A (en) * | 2020-05-15 | 2020-08-25 | 徐州徐工养护机械有限公司 | Foam asphalt integrated foaming beam for foam asphalt cold recycling plant mixing equipment |
| CN111622050A (en) * | 2020-05-28 | 2020-09-04 | 中交路桥建设有限公司 | Construction method for cold regeneration of mixture by adopting foamed asphalt and mixture mixing system |
-
2021
- 2021-10-18 CN CN202111209573.1A patent/CN113931037A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101570950A (en) * | 2009-06-03 | 2009-11-04 | 河南通和高速公路养护工程有限责任公司 | Asphalt cool recycled cement gravel mixed in place train and method for construction |
| WO2018113266A1 (en) * | 2016-12-19 | 2018-06-28 | 江苏一诺路桥工程技术检测有限公司 | Foaming asphalt preparation device and usage method therefor |
| CN111576142A (en) * | 2020-05-15 | 2020-08-25 | 徐州徐工养护机械有限公司 | Foam asphalt integrated foaming beam for foam asphalt cold recycling plant mixing equipment |
| CN111622050A (en) * | 2020-05-28 | 2020-09-04 | 中交路桥建设有限公司 | Construction method for cold regeneration of mixture by adopting foamed asphalt and mixture mixing system |
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Application publication date: 20220114 |