JP2019044367A - Apparatus for producing recycled heated asphalt mixture and method for producing recycled heated asphalt mixture - Google Patents

Abstract

To provide an apparatus for producing a recycled heated asphalt mixture and method for producing the recycled heated asphalt mixture, capable of improving the properties of the recycled heated asphalt mixture regardless of the mixing ratio of recycled aggregate.SOLUTION: An apparatus 10 for producing a recycled heated asphalt mixture comprises: a metered mixing tank 40 functioning as a first mixing apparatus for mixing new asphalt and a recycling additive; a foamed apparatus 60 for adding water to the new asphalt and the recycling additive mixed by the metered mixing tank 40, and foaming both the mixed new asphalt and the recycling additive to produce foamed asphalt; and a mixer 80 functioning as a second mixing apparatus for mixing the foamed asphalt produced by the foamed apparatus 60, a recycled aggregate, and a new aggregate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an apparatus for producing a regenerative heated asphalt mixture and a method for producing a regenerative heated asphalt mixture.

  Asphalt is used as a binder (binder) of materials constituting an asphalt mixture, and is a material which has a good temperature sensitivity and a large change in viscosity due to a change in temperature. The asphalt is mixed with crushed stone, sand and the like at a high temperature in a plant to produce a heated asphalt mixture. Foamed asphalt may be used when producing this heated asphalt mixture.

  Foamed asphalt is a foam made of asphalt using a dedicated device, and can improve the properties of the heated asphalt mixture as compared to the case where ordinary asphalt is used. There are various evaluation methods for evaluating the properties of the heated asphalt mixture, for example, the properties of the mixture are evaluated from the relationship between the compaction temperature and the density, and the workability is evaluated from the relationship between the mixture temperature and the lake load. It is possible to

  On the other hand, in recent years, from the viewpoint of environmental load reduction, reuse of asphalt mixture, that is, use of recycled aggregate (asphalt recycled aggregate) which is a recycled material is required. The recycled aggregate is an aggregate of old asphalt that is obtained by crushing a block of asphalt mixture generated by road surface cutting or stripping of asphalt pavement. This regenerated aggregate is used as coarse aggregate of regenerated heated asphalt mixture and the like.

  When producing the regenerated heated asphalt mixture, it is possible to use the above-mentioned foamed asphalt in order to improve the properties of the regenerated heated asphalt mixture, but at this time, the formed asphalt, the regenerated aggregate and the new aggregate In addition, in order to restore the function of deteriorated old asphalt in regenerated aggregate, additives for regeneration are also mixed. However, by simply mixing together the formed asphalt, the additive for regeneration, the regenerated aggregate and the new aggregate together, the regenerated heating asphalt mixture is obtained according to the fact that the mixing ratio (blending ratio) of the regenerated aggregate becomes high. It becomes difficult to improve the properties of

Patent No. 3976407

  The problem to be solved by the present invention is to provide an apparatus for producing a regeneration heating asphalt mixture and a method for producing a regeneration heating asphalt mixture which can improve the properties of the regeneration heating asphalt mixture regardless of the mixing ratio of the regeneration aggregate. It is.

  The apparatus for producing a regenerated heated asphalt mixture according to claim 1 comprises: a first mixing device for mixing new asphalt and a regeneration additive; the new asphalt mixed by the first mixing device; and the addition for regeneration A foamed device for adding water to an agent and foaming both the mixed asphalt and the regenerating additive to produce a foamed asphalt, the foamed asphalt produced by the foamed device, regenerated And a second mixing device for mixing the aggregate and the new aggregate.

  In the apparatus for producing a regenerative heating asphalt mixture according to claim 2, in the apparatus for producing a regenerative heating asphalt mixture according to claim 1, the addition amount of the new asphalt is relative to the addition amount of the regeneration additive. And 1.00 times or more and 10.60 times or less.

  The apparatus for producing a regenerative heating asphalt mixture according to claim 3 is the apparatus for producing a regenerative heating asphalt mixture according to claim 2, wherein a total addition amount of the new asphalt and the additive for regeneration is the regenerative heating asphalt. It is characterized in that it is 0.50% by weight or more and 9.50% by weight or less based on the total weight of the mixture.

  In the method for producing a regenerated heated asphalt mixture according to claim 4, a step of mixing new asphalt and an additive for regeneration, water is added to the mixed new asphalt and the additive for regeneration, The method comprises the steps of: foaming the new asphalt and the regenerating additive to produce a formed asphalt; and mixing the formed asphalt, the regenerated aggregate, and the new aggregate. .

  In the method for producing a regenerative heating asphalt mixture according to claim 5, in the method for producing a regenerative heating asphalt mixture according to claim 4, the addition amount of the new asphalt is relative to the addition amount of the regeneration additive. And 1.00 times or more and 10.60 times or less.

  The method for producing a regenerative heating asphalt mixture according to claim 6 is the method for producing a regenerative heating asphalt mixture according to claim 5, wherein a total addition amount of the new asphalt and the additive for regeneration is the regenerative heating asphalt It is characterized in that it is 0.50% by weight or more and 9.50% by weight or less based on the total weight of the mixture.

  ADVANTAGE OF THE INVENTION According to this invention, the property of a reproduction | regeneration heating asphalt mixture can be improved irrespective of the mixing rate of reproduction | regeneration aggregate.

It is a figure which shows schematic structure of the manufacturing apparatus of the reproduction | generation heating asphalt mixture which concerns on 1st Embodiment. It is a figure for demonstrating the test condition which concerns on 1st Embodiment. It is a graph which shows the relationship between the compression temperature and density which concern on 1st Embodiment. It is a graph which shows the relationship between the mixture temperature which concerns on 1st Embodiment, and the rake load. It is a figure for demonstrating the content of the old asphalt which concerns on 1st Embodiment, the additive for reproduction | regeneration, and the addition amount of new asphalt. It is a figure for demonstrating the ratio of the addition amount of the new asphalt with respect to the addition amount of the additive for reproduction | regeneration which concerns on 1st Embodiment. It is a figure for demonstrating the total addition amount of the additive for reproduction | regeneration which concerns on 1st Embodiment, and a new asphalt. It is a figure which shows schematic structure of the manufacturing apparatus of the reproduction | generation heating asphalt mixture which concerns on 2nd Embodiment.

First Embodiment
The first embodiment will be described with reference to FIGS. 1 to 7.

(Basic configuration)
As shown in FIG. 1, the apparatus 10 for producing a regenerative heating asphalt mixture according to the first embodiment includes an asphalt tank 20, an additive tank 30, a measuring and mixing tank 40, a water tank 50, and a formed apparatus 60. , An aggregate supply device 70, and a mixer 80. The measuring and mixing tank 40 functions as a first mixing device, and the mixer 80 functions as a second mixing device.

  The asphalt tank 20 is a storage unit for storing new asphalt (new asphalt). The asphalt tank 20 can heat new asphalt to a predetermined temperature (for example, 130 to 180 ° C.) by a heater or the like. The new asphalt in the asphalt tank 20 is a molten asphalt which is heated to the above-mentioned predetermined temperature and has fluidity.

  The above-mentioned asphalt tank 20 is connected to the measurement mixing tank 40 by the asphalt supply pipe 21. One end of the asphalt supply pipe 21 is connected to the asphalt tank 20, and the other end is connected to the measuring and mixing tank 40. The new asphalt in the asphalt tank 20 is reduced in viscosity by heating and has fluidity, and is supplied from the asphalt tank 20 into the measuring and mixing tank 40 through the asphalt supply pipe 21.

  The additive tank 30 is a storage unit for storing the additive for regeneration. The additive tank 30 can heat the additive for regeneration to a predetermined temperature (for example, 120 ° C. or more) by a heater or the like. The regeneration additive in the additive tank 30 is a molten additive which is heated to the above-mentioned predetermined temperature and has fluidity. This additive for regeneration is an additive for recovering the function of the old asphalt which has deteriorated in the regenerated aggregate (asphalt regenerated aggregate).

  The aforementioned additive tank 30 is connected to the metering and mixing tank 40 by the additive supply pipe 31. One end of the additive supply pipe 31 is connected to the additive tank 30, and the other end is connected to the measuring and mixing tank 40. The additive for regeneration in the additive tank 30 is reduced in viscosity by heating and has fluidity, and is supplied from the additive tank 30 into the measuring and mixing tank 40 via the additive supply pipe 31.

  The metering and mixing tank 40 includes new asphalt (heated asphalt) supplied from the asphalt tank 20 through the asphalt supply pipe 21 and a regeneration additive supplied from the additive tank 30 through the additive supply pipe 31 (heating Weigh and mix with the regenerating additive). The measuring and mixing tank 40 measures the weight of the material by, for example, a weight scale or the like, and mixes the materials by a rotation operation of a stirring blade or the like. In the weight measurement of the material, only the weight of the new asphalt is first measured, and then, the regeneration additive is added to the new asphalt, and the total weight of the new asphalt and the regeneration additive is measured.

  A mixture discharge pipe 41 is connected to the above-described metering and mixing tank 40. One end of the mixture discharge pipe 41 is connected to the measuring and mixing tank 40, and the other end is positioned above the mixer 80. The mixture (mixture of new asphalt and regenerating additive) in the metering and mixing tank 40 flows from the metering and mixing tank 40 to the mixture discharge pipe 41, flows through the mixture discharge pipe 41, passes through the forming apparatus 60, and Supplied to

  The water tank 50 is a storage unit that stores water at normal temperature. The water tank 50 is connected to the foam device 60 by a water supply pipe 51. One end of the water supply pipe 51 is connected to the water tank 50, and the other end is connected to the foam device 60. Water in the water tank 50 is supplied from the water tank 50 into the formed apparatus 60 through the water supply pipe 51.

  The formed device 60 is provided in the middle of the mixture discharge pipe 41. This foamed apparatus 60 provides the water supplied from the water tank 50 through the water supply pipe 51 to the molten mixture flowing through the mixture discharge pipe 41, and both the new asphalt in the mixed state and the additive for regeneration To produce foamed asphalt. The formed device 60 is configured to supply the water supplied from the water supply pipe 51 into the mixture discharge pipe 41 from a plurality of places.

  In the above-described formed apparatus 60, water is supplied to the mixture flowing through the mixture discharge pipe 41, and the mixture is foamed to generate formed asphalt. The formed asphalt is injected from a plurality of locations at the end of the mixture discharge pipe 41 and supplied to the mixer 80 in a predetermined amount. In addition, the nozzle is separately provided in the multiple places of the edge part of the mixture discharge pipe 41, for example, and the mixture discharge pipe 41 is formed so that it can inject formed asphalt from each nozzle of the edge part. It is done.

  The aggregate supply device 70 supplies a predetermined amount of regenerated aggregate and a predetermined amount of new aggregate into the mixer 80. The aggregate supply device 70 includes, for example, a recycled aggregate hopper, a new aggregate hopper, a conveyor, a dryer, and the like. The recycled aggregate is an aggregate of old asphalt that is obtained by crushing a block of asphalt mixture generated by road surface cutting or stripping of asphalt pavement. The new aggregate is aggregate such as crushed stone, crushed sand, fine sand, stone powder and the like.

  The mixer 80 mixes the formed asphalt supplied from a plurality of locations at the end of the mixture discharge pipe 41 with the regenerated aggregate and the new aggregate supplied from the aggregate supply device 70. The mixer 80 mixes the materials, for example, by a rotating operation of a stirring blade or the like. This mixes the formed asphalt, the regenerated aggregate and the new aggregate, and the regenerated heated asphalt mixture is completed.

  Although not shown, each tube 21, 31, 41, 51 is provided with a pump, an on-off valve, etc. as needed for liquid transfer or liquid transfer control, and these pumps or on-off valves are controlled Controlled by the device. That is, the control device controls the liquid supply operation according to the measurement result by the measurement and mixing tank 40 and the like. The control device also controls the mixing operation (rotational operation of a stirring blade or the like) of the metering and mixing tank 40 and the mixer 80.

(Manufacturing process)
Next, the flow of the manufacturing process of the regeneration heating asphalt mixture by the above-mentioned regeneration heating asphalt mixture manufacturing apparatus 10 will be described.

  As shown in FIG. 1, when new asphalt heated to a predetermined temperature is supplied from the asphalt tank 20 to the measuring and mixing tank 40 through the asphalt supply pipe 21 and the amount of new asphalt in the measuring and mixing tank 40 becomes a predetermined amount , Supply of new asphalt will be stopped. Next, the regeneration additive heated to a predetermined temperature from the additive tank 30 is supplied to the measurement mixing tank through the additive supply pipe 31, and the total amount of the new asphalt and the regeneration additive in the measurement mixing tank 40 Becomes a predetermined amount, the supply of the regeneration additive is stopped. During this feeding operation, the new asphalt and the regenerating additive in the metering and mixing tank 40 are mixed, and the sufficiently mixed mixture of the new asphalt and the regenerating additive is discharged from the metering and mixing tank 40 to the mixture discharge pipe 41. The mixture is discharged and flows through the mixture discharge pipe 41 to reach the formed device 60.

  In the formed apparatus 60, water is supplied to the mixture flowing through the mixture discharge pipe 41, and both the new asphalt in the mixed state and the regenerating additive are foamed to produce the formed asphalt. The formed asphalt flows through the mixture discharge pipe 41, is jetted from a plurality of locations at the end of the mixture discharge pipe 41, and is supplied into the mixer 80 in a predetermined amount. In the mixer 80, a predetermined amount of regenerated aggregate and a predetermined amount of new aggregate are previously supplied from the aggregate supply device 70. In the mixer 80, the foamed asphalt supplied from the end of the mixture discharge pipe 41 and the regenerated aggregate and the new aggregate supplied from the aggregate supply device 70 are mixed to complete the regeneration heated asphalt mixture Do.

  According to such a manufacturing process, new asphalt and the additive for regeneration are mixed by the metering and mixing tank 40, and then water is added to the mixed asphalt and the additive for regeneration from the water tank 50 by the foam device 60. Be As a result, both the new asphalt in the mixed state and the regenerating additive are foamed to produce a formed asphalt. Thereafter, the mixer 80 mixes the formed asphalt with the regenerated aggregate and the new aggregate to complete the regenerated heated asphalt mixture. Thus, by mixing the new asphalt and the regeneration additive, bubbles are generated throughout the formed asphalt by foaming the new asphalt in the mixed state and the regeneration additive to form the formed asphalt. Since it generate | occur | produces uniformly and the fluidity | liquidity of a reproduction | regeneration heating asphalt mixture improves, the property of a reproduction | regeneration heating asphalt mixture can be improved irrespective of the mixing ratio (compounding ratio) of reproduction | regeneration aggregate.

(Characteristic evaluation of the regeneration heating asphalt mixture of this embodiment)
Next, in order to evaluate the properties of the regenerative heating asphalt mixture of the present embodiment, the regenerative heating asphalt mixtures of Comparative Example 1 and Comparative Example 2 and the regenerative heating asphalt mixture of the present embodiment are based on the test conditions shown in FIG. The relationship between the compression temperature and the density shown in FIG. 3 and the relationship between the mixture temperature and the rake load shown in FIG. 4 were determined for these regenerated heated asphalt mixtures, and their properties were compared with each other.

  As shown in FIG. 2, with respect to the formulation, Comparative Example 1, Comparative Example 2 and the present embodiment are the same. The blending ratio of the regenerated dense particle mixture (13) is 70% (R70). With regard to supply, in Comparative Example 1, neither the new asphalt nor the additive for regeneration is foamed (foamed), and in Comparative Example 2, both the new asphalt and the additive for regeneration are foamed alone (foam alone) In this embodiment, the new asphalt and the regeneration additive are mixed in advance and foamed (premixed and formed) and supplied. With regard to the mixing order, in Comparative Example 1, in the order of “regenerated aggregate”, “regeneration additive”, “new aggregate”, “new asphalt”, in Comparative Example 2, “regenerated aggregate”, “foamed In this embodiment, in the order of “regeneration additive”, “new aggregate”, “foamed new asphalt”, “mixture of regenerated aggregate and new aggregate”, “regeneration additive and new asphalt” are mixed Each material is mixed in the order of “foamed (foamed asphalt)”. Regarding the temperature, the production temperature and the rolling pressure temperature are the same in Comparative Example 1, Comparative Example 2 and this embodiment, the production temperature is 160 ° C., and the rolling pressure temperature is 160 to 100 ° C.

As shown in FIG. 3, when the desired density is, for example, 2400 g / cm ³ from the relationship between the compaction temperature and the density, the compaction temperature of Comparative Example 1 becomes around 150 ° C., and the present embodiment and Comparative Example 2 The compaction temperature is around 120 to 125 ° C. Therefore, even if the compression pressure temperatures in the present embodiment and the comparative example 2 are lower by about 25 to 30 ° C. than in the comparative example 1, it is possible to obtain a desired density. As a result, the desired temperature range of the regenerative heating asphalt mixture at the time of compaction is expanded, so that it becomes easy to maintain the temperature of the regenerative heating asphalt mixture within the desired temperature range, such as during the compaction operation. Can.

  As shown in FIG. 4, from the relationship between the mixture temperature and the rake load, the rake load of the present embodiment and the comparative example 2 is smaller than that of the comparative example 1 within the range of 105 to 145 ° C. Furthermore, the rake load of the present embodiment is smaller than the rake load of Comparative Example 2 in the range of 110 to 145 ° C. Therefore, in the present embodiment, the rake load can be made smaller in the range of 105 to 145 ° C. than in Comparative Example 1, and further smaller in the range of 110 to 145 ° C. than in Comparative Example 2. It is possible to Thereby, the rake load can be reduced and the workability can be improved.

  According to the comparison of such properties, according to the regeneration heating asphalt mixture of the present embodiment, the ordinary regeneration heating asphalt mixture manufactured without using the formed asphalt, asphalt and the regeneration additive are each independently foamed The properties of the regenerated heated asphalt mixture can be improved as compared to the produced regenerated heated asphalt mixture. In addition, in the case where the asphalt and the additive for regeneration are independently foamed, it is necessary to provide two foamed devices, but according to the present embodiment, the asphalt and the additive for regeneration are mixed and then foamed together. Therefore, the device configuration can be simplified because it is sufficient to provide one formed device.

(Addition amount of additives for regeneration and new asphalt)
Next, the addition amounts of the regeneration additive and the new asphalt will be described with reference to FIG. In FIG. 5, the addition amount of each material is included by weight with respect to the total weight of the regeneration heating asphalt mixture (the total weight of the regeneration additive, the new asphalt, the regeneration aggregate and the new aggregate) In other words, it is shown by weight% which shows a weight ratio. Moreover, in the property evaluation in FIG. 5, a "(circle)" mark (circle mark) shows a pass.

  As shown in FIG. 5, the binder is composed of old asphalt (included in recycled aggregate), new asphalt, and an additive for regeneration. New asphalt and regenerating additives are newly added materials. In addition, since the additive for regeneration is added until the property of the deteriorated old asphalt recovers to the target property, the amount of the additive for reproduction is determined depending on the degree of deterioration of the old asphalt.

  For example, as shown in FIG. 5, when the mixture type is regenerated dense-grained mixture (13) R75, the content of old asphalt is 3.87% by weight, and the additive amount of the regeneration additive is 0.19% %, And since the amount of new asphalt added is 1.24% by weight, the amount of binder added is 5.30% by weight. At this time, the ratio of the addition amount of new asphalt to the addition amount of the regeneration additive (the ratio of (3) to (2)) is 6.52, and the total addition amount of the regeneration additive and the new asphalt ((2) The total added amount of + (3)) is 1.43% by weight. In addition, the content of the old asphalt, the additive for regeneration, and the addition of new asphalt in other mixtures (regenerated dense-grained mixture (20) R 75, regenerated stable processing mixture (30) R 70, regenerated coarse-grained mixture (20) R 75) The amount, the ratio of the addition amount of the new asphalt to the addition amount of the regeneration additive, and the total addition amount of the regeneration additive and the new asphalt are as shown in FIG.

  As shown in FIG. 5, when the ratio of the amount of addition of new asphalt to the amount of additive for regeneration (the ratio of (3) to (2)) is 6.52, the property evaluation is “o”. Moreover, when the ratio of the addition amount of the new asphalt to the addition amount of the additive for regeneration is 6.26, the property evaluation is “o”. When the ratio of the addition amount of new asphalt to the addition amount of the additive for regeneration is 2.43, the property evaluation is “o”. When the ratio of the addition amount of the new asphalt to the addition amount of the additive for regeneration is 10.60, the property evaluation is “o”. As described above, at any ratio, the property evaluation is regarded as passing.

(The ratio range of the addition amount of new asphalt to the addition amount of the additive for regeneration)
In order to determine the range of the ratio based on the ratio (ratio of (3) to (2)) of the addition amount of new asphalt to the addition amount of the additive for reproduction as shown in FIG. 5 described above, the additive for reproduction The properties are evaluated for each ratio of the amount of addition of new asphalt to the amount of addition of and the results of the property evaluation are shown in FIG. In the evaluation of properties in FIG. 6, the “o” mark (circle) indicates a pass, and the “x” mark (cross) indicates a fail.

  As shown in FIG. 6, the ratio of the addition amount of new asphalt to the addition amount of the regeneration additive is 30/70 (= 0.42), 40/60 (= 0.66), 95/5 (= 19. When it is 00), property evaluation is "x". Moreover, when the ratio of the addition amount of new asphalt to the addition amount of the additive for regeneration is 50/50 (= 1.00), 70/30 (= 2. 33), 2.43 to 10.60, the property is Evaluation is "○". From the result of such property evaluation, the addition amount of new asphalt is preferably 1.00 times or more and 10.60 times or less the addition amount of the additive for regeneration. In this case, the properties of the regenerative heating asphalt mixture can be reliably improved.

(Total amount of additives for regeneration and new asphalt)
In order to determine the range of the total addition amount based on the total addition amount (total addition amount of (2) + (3)) of the additive for regeneration and new asphalt as shown in FIG. 5 described above, The properties were evaluated, and the results of the property evaluation are shown in FIG. At this time, the addition amount of new asphalt is 1.00 times or more and 10.60 times or less of the addition amount of the regeneration additive. In the evaluation of properties in FIG. 7, as in FIG. 6 described above, the “o” mark (circle) indicates a pass, and the “x” mark (cross) indicates a fail.

  As shown in FIG. 7, when the sum total addition amount of the additive for reproduction | regeneration and new asphalt is 0.30, 10.00, property evaluation is "x". Moreover, when the total addition amount of the additive for reproduction | regeneration and new asphalt is 0.50, 0.79-1.74, 9.50, property evaluation is "(circle)". From the results of such property evaluations, the addition amount of new asphalt is 1.00 times or more and 10.60 times or less of the addition amount of the regeneration additive, and further, the total of the regeneration additive and the new asphalt The addition amount is desirably 0.50% by weight or more and 9.50% by weight or less based on the total weight of the regenerated heated asphalt mixture. In this case, the properties of the regenerative heating asphalt mixture can be reliably improved.

(Summary of the first embodiment)
As described above, according to the first embodiment, asphalt and the additive for regeneration are mixed, water is added to the asphalt in the mixed state and the additive for the regeneration, and the asphalt and additive for the mixture in the mixed state Both foam and foam asphalt is produced. Thereafter, the formed asphalt, the recycled aggregate and the new aggregate are mixed. Thus, regardless of the mixing ratio of the recycled aggregate, a typical regenerated heated asphalt mixture produced without using foamed asphalt, a regenerated heated asphalt mixture produced by foaming asphalt and an additive for regeneration independently, respectively, etc. In comparison to the above, the properties of the regenerated heated asphalt mixture can be improved. In addition, since asphalt and regenerating additive are mixed and then foamed together, one foamed device is made as compared to the case where asphalt and regenerating additive are individually foamed by individual foamed devices. Since it becomes possible, the device configuration can be simplified.

  The addition amount of new asphalt is preferably 1.00 or more and 10.60 or less with respect to the addition amount of the additive for regeneration. In this case, the properties of the regenerative heating asphalt mixture can be reliably improved. Moreover, the addition amount of new asphalt is 1.00 or more and 10.60 or less with respect to the addition amount of the additive for regeneration, and the total addition amount of the additive for regeneration and the new asphalt is that of the regeneration heating asphalt mixture It is desirable that it is 0.50 weight% or more and 9.50 weight% or less with respect to the total weight. In this case, the properties of the regenerated heated asphalt mixture can be more reliably improved.

Second Embodiment
A second embodiment will be described with reference to FIG. In the second embodiment, only the differences (the measuring tank and the mixing tank) from the first embodiment will be described, and the other descriptions will be omitted.

  As shown in FIG. 8, the apparatus 10 for producing a regenerative heating asphalt mixture according to the second embodiment is replaced with the measuring and mixing tank 40 according to the first embodiment, and two measuring tanks 42 and 43 and a mixing tank 44 are provided. Is equipped. The mixing tank 44 functions as a first mixing device.

  The measuring tank 42 is provided in the middle of the asphalt supply pipe 21. The measuring tank 42 measures the amount of new asphalt supplied from the asphalt tank 20 via the asphalt supply pipe 21 by, for example, a weight scale or the like.

  The measuring tank 43 is provided in the middle of the additive supply pipe 31. The measuring tank 43 measures the amount of the regeneration additive supplied from the additive tank 30 via the additive supply pipe 31 by, for example, a weight meter, as in the above-described measuring tank 42.

  The mixing tank 44 includes new asphalt (heated asphalt) supplied from the measuring tank 42 via the asphalt supply pipe 21 and an additive for regeneration supplied from the measuring tank 43 via the additive supply pipe 31 (for heating and regeneration Additives). The mixing tank 44 mixes the materials by, for example, a rotational operation of a stirring blade or the like.

  In the regeneration heating asphalt mixture producing apparatus 10 having such a configuration, the new asphalt and the regeneration additive are mixed by the mixing tank 44 as in the first embodiment, and the mixing apparatus 44 mixes the new asphalt and the regeneration additive from the water tank 50. Water is added to the new asphalt and rejuvenating additives. As a result, both the new asphalt in the mixed state and the regenerating additive are foamed to produce a formed asphalt. Thereafter, the mixer 80 mixes the formed asphalt with the regenerated aggregate and the new aggregate to complete the regenerated heated asphalt mixture. Thus, by mixing the new asphalt and the regeneration additive, bubbles are generated throughout the formed asphalt by foaming the new asphalt in the mixed state and the regeneration additive to form the formed asphalt. Since it generate | occur | produces uniformly and the fluidity | liquidity of a reproduction | regeneration heating asphalt mixture improves, the property of a reproduction | regeneration heating asphalt mixture can be improved irrespective of the mixing ratio (compounding ratio) of reproduction | regeneration aggregate.

  As described above, according to the second embodiment, the same effect as that of the first embodiment can be obtained. That is, similarly to the first embodiment, regardless of the mixing ratio of the regenerated aggregate, the ordinary regenerated heated asphalt mixture manufactured without using the formed asphalt, asphalt and the additive for regeneration are independently foamed. The properties of the regenerated heated asphalt mixture can be improved as compared to the produced regenerated heated asphalt mixture, etc. Furthermore, compared to the case where asphalt and the additive for regeneration are individually foamed by individual foamed devices, a foamed device Can be simplified to simplify the apparatus configuration.

Other Embodiments
In the above description, the water in the water tank 50 is illustrated to be at normal temperature, but the invention is not limited thereto. For example, the water in the water tank 50 may be cooled by a cooling device or a heating device It may be made to heat by. By changing the water temperature in this way, it is possible to adjust the degree of foaming, so that the properties of the regenerative heating asphalt mixture can be surely improved.

  The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the invention. For example, some components may be deleted from all the components shown in the above embodiments. Furthermore, constituent elements in different embodiments may be combined as appropriate.

DESCRIPTION OF SYMBOLS 10 Reproduction heating asphalt mixture production apparatus 20 Asphalt tank 21 Asphalt supply pipe 30 Additive tank 31 Additive supply pipe 40 Measurement mixing tank 41 Mixture discharge pipe 42 Measurement tank 43 Measurement tank 44 Mixing tank 50 Water tank 51 Water supply pipe 60 Foam Equipment 70 Aggregate feeder 80 Mixer

Claims (6)

A first mixing device for mixing new asphalt and a regeneration additive;
Water is added to the new asphalt mixed by the first mixing device and the additive for regeneration, and foam is formed by foaming both the new asphalt and the additive for regeneration in the mixed state to produce a formed asphalt Device, and
A second mixing device for mixing the formed asphalt, regenerated aggregate and new aggregate produced by the formed device;
An apparatus for producing a regenerative heating asphalt mixture, comprising:   The apparatus according to claim 1, wherein the amount of the new asphalt added is 1.00 times or more and 10.60 times or less the amount of the regeneration additive added.   The total addition amount of the said new asphalt and the said additive for reproduction | regeneration is 0.50 weight%-9.50 weight% or less with respect to the total weight of reproduction | regeneration heating asphalt mixture, It is characterized by the above-mentioned. Production equipment for regenerative heating asphalt mixture. Mixing the new asphalt and the additive for regeneration;
Adding water to the mixed fresh asphalt and the additive for regeneration, and foaming the mixed asphalt and the additive for regeneration to produce a formed asphalt;
Mixing the formed asphalt, the regenerated aggregate and the new aggregate,
A process for producing a regenerated heated asphalt mixture, characterized in that it comprises:   The method for producing a regenerated heated asphalt mixture according to claim 4, wherein the addition amount of the new asphalt is 1.00 times or more and 10.60 times or less of the addition amount of the regeneration additive.   The total addition amount of the new asphalt and the additive for regeneration is 0.50% by weight or more and 9.50% by weight or less based on the total weight of the regenerated heated asphalt mixture. Process for the production of regenerated heated asphalt mixtures.

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