CA1077873A - Asphalt recycle system - Google Patents
Asphalt recycle systemInfo
- Publication number
- CA1077873A CA1077873A CA267,584A CA267584A CA1077873A CA 1077873 A CA1077873 A CA 1077873A CA 267584 A CA267584 A CA 267584A CA 1077873 A CA1077873 A CA 1077873A
- Authority
- CA
- Canada
- Prior art keywords
- water
- asphalt
- tank
- approximately
- asphalt waste
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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
ABSTRACT OF THE DISCLOSURE
Steam is supplied into water to regenerate asphalt waste which in turn is heated in the water to a predetermined temperature. Such heated asphalt waste is mechanically separated in the water, thereby becoming aggregate grains each having the surface coated with a thin asphalt film.
Steam is supplied into water to regenerate asphalt waste which in turn is heated in the water to a predetermined temperature. Such heated asphalt waste is mechanically separated in the water, thereby becoming aggregate grains each having the surface coated with a thin asphalt film.
Description
7E~73 "
This invention relates to an asphalt recycle system.
Conventional asphalt used for pavement works is normally thrown away as waste during road repairs. ~owever, such disposal of asphalt waste invites not only economical loss but also environmental pollution. Furthermore, the transportation of the waste consumes considerable time and cost. It is also unfavored from the standpoint of utilizing resources which is presently a world-wide problem.
Hence, a system which recycles asphalt has been searched for. The recycling or regenerative methods proposed in the past include that of heating the waste with high-frequency waves or directly with flame; that of exposing the wastetO steam; that of indirectly heating the waste with high-temperature oil; and that of crushing. None of these methods, however are commercially satisfactory~ for various reasons such as expense or qualitative degradation.
The present invention attempts to provide an asphalt recycle system of high practicability which can maintain the asphalt at the high quality level.
In a preferred system according to the invention, steam is supplied into water to regenerate the heretofore thrown away asphalt waste, and remark-ably improved treating effects are achievedO To wit, one of the essential features of the present invention resides in jetting steam into water, whereby the asphalt waste is heated in the presence of water.
According to the invention, the asphalt waste is sunk in water during both the heating and the separation (decomposition)~ This is an important feature of the invention. Use of steam also is an important feature, but it can achieve the desired effect only when used in combination with the water.
. .
; Therefore, the system is based on a fundamentally different principle from that of the recycle system in which the waste is heated when exposecl to an atmosphere of steam. Again, while various heating media are known, high-temperature steam is used in the invention to heat the asphalt waste in water.
``: ', .
; ~ . .
t77E~73 l I
, According to the present invention, there is provided a method o regenerating asphalt waste, comprising the steps of: jetting steam into water in a tank to make said water hot; sinking asphalt waste into said hot water in 4 said tank; heating said asphalt waste in said water to a predetermined temp-erature level to make said asphalt waste soft; and separating said heato~ and softened asphalt waste as sunk in said water by means of a mechanical separator thereby to make said asphalt waste disengaged into aggregate grains or elements each having the surfaces coated with a thin asphalt film In another aspect, the present invention provides an apparatus for regenerating asphalt waste, comprising: a tank for containing water to a predeterm~ned level; means for jetting steam into water in said tank to heat the water; and means for mechanically separating in the water the asphalt waste as heated and softened by the steam.
- The method of this invention permits the asphalt waste, when torn off from a paved road, to be treated. In other words, sorting or washing of the waste pieces is unnecessary. This is a great advantage in practicing the method. If a preliminaYy sorting or washing of the material is required ` before the regenerative treatment~ particularly when enormous volume of the waste is to be treated, the time and cost loss would be very serious.
Again according to the invention, because the asphalt waste is de-composed (separated) as softened and sunk in the water, the aggregate does not adhere to the separation tank or to other aggregates.
.
Furthermore, the separation (decomposition) of the asphalt waste as softened and sunk in the water produces another advantage that the individual aggregate grains are simply separated among one another~ but an aggregate grain itself is not brokon. This i~ very important, particularly in rolation to the strength. As is well known, the shape or configuration of the aggregate is an important factor in obtaining the predetermined strength of asphalt concrete. For this reason an asphalt ~e y~le system which destroys the .~
~C~778~3 aggregates, such as the crushing method, carmot be said practical. According to the invention the aggregates are simply separated into individual pieces while retaining the original shapes, and is free of the problem of strength - deterioration.
The present invention will now be described in more detail with reference to the accompanying drawings, in which:-Figure 1 is a schematic vertical section of an asphalt recyclesystem according to the present invention;
Figure 2 is a diagrammatic view of another asphalt recycle system according to the present inven~ion;
; Figure 3 is a schematic vertical section of a part of the asphalt recycle system shown in Figure 2, Figure 4 is a schematic view of still another asphalt recycle system according to the present invention; and Figure ~ is a side view of the system shown in Figure 4.
According to the invention~ first the heated steam is jetted into water in a tank, and into which the asphalt waste is sunk and heated to a predetermined temperature. Normally preferred temperature level of the waste ranges from 80 C to 100 C under the atmospheric pressure, particularly approx-- 20 imately 90 C. Obviously the temperature condition is variable under highly pressuri~ed atmosphere or under other unusual ambient conditions. Thus heated asphalt waste is separated by a suitable mechanical means as sunk in the water.
., For example, the asphalt waste is sunk in the water in the tank and heated at - 100 C for approximately 20 minutes, and disengaged into individual , grains in the water by means of, for example, a screw.
The mixture resulting from the separation according to the invention .
; consists of many aggregate grains each having the surfaces coated with a thin asphalt film. The sizes of the aggregates depend on those of the asphalt was~e ~ initially introdwced to the water. They may be uniform or various. The ; - 3 -~' ,i .
77873 , I
- asphalt coating on the surfaces oE a grain of the asphalt waste possesses strong adhering power to that particular grain, but exhibits no adhering tendency to other aggregate grains or the asphalt coating on their surfaces.
Therefore, the great number of aggregate grains each having the asphalt-coated surfaces are loose and mobile independently of each other. Consequently, they can be very easily sorted with sieves into the desired number of size groups if necessary.
- The asphalt coating on the aggregates' surfaces may contain a minor amount of an active substance. Preferably the amount of such an active sub-` 10 stance should range 5 to 20 % to the asphalt coating by weight ratio, inter ~` alia, approximately 10 %. (The ratio may be varied depending on the intended utility-of the product, type and dimensions of the aggregate, specific type - of the asphalt, etc.) While various active substances may be used, preferably ` active terra alba and active carbon are concurrently employed. It has been experimentally confirmed that favorable results can be obtained when the active ` component is composed of approximately 80 - 95 % of active terra alba and approximately 20 - 5 % of active carbon. Optimum results can be obtained, furthermore, when 90 % of active terra alba and 10 % of active carbon are used, although the results are to some extent dependent also on other condi-;~ 20 tions of use.
The asphalt coating may furthermore contain filler. The suitable filler content is widely variable depending on the intended utility of the product, but normally it is preferable to use approximately the same amount offfiller to that of the asphalt.
~: The mixture of the asphalt-coated aggregates of various grain sizes can be put to various usages as it is, but the field of its application can be still broadened when it is sorted into groups of approximately same grain sizes. For instance, the mixture may be diviclccl with sieves ;nto four size groups to be put to four separate usages as follows:
```'` , . ~ . - '1 -., :
77~7;3 (a) the grains having the diameters ranging from 20 mm to 13 mm; ~b) those of 13 mm to 5 mm; (c) those of 5 mm to 2.5 mm; and (d) those having the diameters less than ~.5 mm. It is also possible to blend the aggregates of those size groups at a suitable blend ratio.
~lereinafter some of the embodiments of this inven~ion will be ex-plained with reference to the attached drawings.
` First referring to Figure 1, a sheet of wire net 5, steam pipe 3, and a crusher or separator 6 are installed inside a tank 4 at sequentially lower position, by the order stated. The wire net 5 and the crusher or separator 6 may be omitted if so-desired. At the bottom of the tank 4, a means of transportation, for example, screw 8, is connected. The screw 8 can func-tion also as the means for separation, and therefore the asphalt can be suf-ficiently separated without the crusher or separator 6. The screw 8 is also connected to the lower edge of a hot elevator 9. A means for selection or sorting, for example, a shaking sieve 11, is located at the position to receive ` the asphalt waste dropped from the upper end of the elevator 9. The sieve ll is provided with the sorting pipes 13. The steam pipes 2 from the boiler 1 are connected respectively to the tank 4, hot elevator 9 and the screw 8, each containing as installed therein a porous steam pipe 3. The tank 4 and the hot elevator 9 are filled with water to the predetermined level X. Into the water ;- in the tank 4, heated steam is jetted through the pores in the steam pipe 3.
The operation of the above-described apparatus according to the ; invention will now be explained.
Blocks of asphalt waste 15 are thrown into the tank 4 from the ,` top, which can be efficiently accomplished with a shoveldozer. The blocks .; are first roughly sorted with the wire net 5. In the embodiment illustrated `:
'~ by Figure 1, the water level X in the tank 4 is set above the wire net 5.
Heated steam is jetted into the water in tank ~ ~rom thc boilor 1, through the steam pipes 2 and 3, to raise the temperature of the system to an appropriate ~';
_ 5 ~
;::
.
113~7~73 level, -for example, 90C. Thus heated asphalt waste is separated into the h~r ~ c~-f~
r~i aggregates with the ~n~r 6 and/or screw 8. Thus separated aggregates are ~ sent to the shaking sieve 11 by means of the hot elevator 9 where the aggregate are sorted into the desired number of groups according to their grain sizes.
Thus separated and sorted aggregates are mixed with a volatile liquid and an emulsifier to provide regenerated asphalt blocks (room tempera-ture asphalt blocks). It is also possible to obtain a regenerated asphalt mixture by heating the sorted aggregates. Thus the asphalt waste can be re-- generated and re-used for the conventional road-paving.
Now another embodiment of the asphalt waste recycle system according to the invention will be explained, referring to Figures 2 and 3O
Although two tanks 10 and 12 are shown in Figure 2, the number of tanks is optional. That is, a single tank or more than two tanks may be used depending upon particular needs. The tanks 10 and 12 are connected to the hot elevator 143 the other end of the ele~ator 14 leading to a screen sheet 160 The tanks 10 and 12 are also connected to a driving source 18 which is controlled by the regulating means 20. The tank 10 is connected to a boiler ~ 2~ so that a high-pressure and high-temperature steam may be sent into the : tank. Similarly the tank 12 is connected to the boiler 22 for sending a high-pressure and high-temperature steam. The boilers may be combined into " one.
The important features of the above-described construction will be explained in further detail with reference to Figure 3O The boiler 22 is provided with a plurality of pipes 26, a part of which are connected to the hot elevator 14, and another part to the inside of thc ~ank 12. The pipe 26a in the tank 12 is perforatod, and through tho many poros hoated stoam is jetted into the water~ At the bottom of tank 12 a separation mcilns 28 is installed. The separation means 28 used in the em`bodiMent is of screw type7 and the separation is effected as the materia~L under treatment moves from the 7'7873 , I
left to right in the drawing. The tank 12 is filled with water 30 to the level X. The hot elevator 14 is connected to the tank 12 by the pipe 260 The water level X is common between the tank 12 and hot eleva~or 1~. From above the tank 12 the asphalt waste blocks are thrown into the ~ank and heat-ed to the predetermined temperature in the high-temperature water. The blocks are then transferred to the right direction while being disengaged into in-dividual aggregate grains by the action of screw 28. Thus separated, aggre-gates are sent upward by the hot elevator 14 and further transferred into the sorting means 16 (for example, screen) to be sorted into size groups.
In this embodiment also the suitable temperature of water ranges from 80 C. to 100 C., particularly about 90 C. (The temperature is variable under special ambient conditions such as highly elevated pressure).
Incidentally the separation means 28 is not limited to the screw type. The sorting or screening means 1~ is preferably so designed that it can sort the aggregate grains into four groups according to their diameters, , respectively ranging (a) 20 mm - 13 mm (b) 13 mm - 5 rnm (c) 5 mm - 205 mm and (d~ less than 2.5 mm. ObviOuslyg sorting in different manner is perfectly acceptable as the occasion demandsO
` Referring back to Figure 27 each of the size groups sorted by the screening means 16 (to wit, the aggregate grains each having the surfaces ~ coated with an asphalt film which exhibits no adhesivenessto each other) is : sent to the respective feeder hopper. For example, the grains of the diameters ranging from 20 mm to 13 mm are sent to the feeder hopper 320 Those of the ` diameters ranging from 13 mm to 5 mm are sent into the feeder hopper 34;
those of 5 mm to 2.5 mm, to the feeder hopper 36; and those of less than 2.5 mmg to the feeder hopper 3~0 Similarly, the feeder hoppers 40, 42, 44 and 46 .
,., ~
- are provided to collect the aggregate grains of the diameters, respectively, ;~:
ranging from 20 mm - 13 mm~ 13 mm - 5 mm~ 5 mm - 2.5 mm~ and lcss than 2~5 mm.
The feeder hoppers 32~ 34, 36 and 3~ are provided with a conveyor 41 in common, ~C~7~ 73 which is movable to either right or left 'by the signa:L given by the controlling means 20. The conveyor 41 is also connected to a reserve feeder hopper 42 which is to accommodate any suitable mixture. Obviously~ more than one reserve feeder hopper may be installed if necessary. At one end of the conveyor 41~
a room-temperature dry asphalt blending means 43 is installed, which is fur-ther connected to a room-temperature pug mill mixer 48 through the conveyor 45.
The mixer 48 in turn is connected to a room-temperature asphalt storing means 52, through the conveyor 50. Any desired amount of the room-temperature asphalt can be suitably taken out of the storing means 52 as the occasion demands. On the other hand, a various heating dry asphalt blending means 54 .
is located at the other end of the conveyor 41. The dry asphalt blending '; means 54 is connected to a dry mixer 58 through a conveyor 56, and the dry mixer 58 is connected to a surge tank 62 through a conveyor 60. The heating asphalt mixture can be suitably taken out of the surge tank 62 as the occasion :~ demands. The aggregate of the grain sizes greater than 20 mm is wi~hdrawn to the direction of the arrow marked 64.
Furthermore, the feeder hoppers 32, 34, 36 and 38 are each provided with a valve, respectively, 32a, 34a, 36a and 38a. By controlling those valves with the controlling means 20, the blend ratio of the asphalt mixture can be ; 20 freely selected. Also the feeder hoppers 40, 42, 44 and 46 can provide each the asphalt mixture of uniform grain size, and have the valves 40a - 46a.
'~ A still another embodiment of the invention will now be explained with reference to Figures 4 and 5.
A mobile chassis 10 has wheels 12. In the illustrated embodiment, the system is run as a motor truck, the driver's seat being positioned at the left side. If required, however, the 'base lO may be separated from the ` driver's seat or the driving portion by employing a trailer system or any other suita'ble system, The treating tank 14 is mounted on the base lO, which is so eonstructed :~`
~7~3'73 ' :- ' that it can contain water to a predetermined level. At the lower portion of the tank 14 a separation means 16 is provided. The specific type of the separation means 16 is not critical, but in the embodiment shown, a screw system is employed. The separation means 16 is connected to a transportation means 18 which is a bucket-type elevator in the embodiment shown. The transportation means 18 is extended from the position of the separation means 16 to that above the treating tank 14, disposed with a slight inclination.
The transportation means 18 is driven by the motor 20. A sorting means 22 is loc~ted at the forward end of the transportation means 18.
The treating tank 14 is connected to a boiler 24 through the pipe 26 as shown in Figure 4, so that the water in the tank 14 is filled to the pre~
determined level is heated to the predetermined temperature by the steam jetted thereinto from the boiler 24. The type of the boiler 24 is not critical~
and the ~oiler itself is not novel. Hence, no detailed explanation of the boiler will be given.
The top of the treatment tank 14 has an opening 14a, which allows the entrance of the asphalt waste to be treated. Obviously, optional design change such as closing the top and providing an entrance at other portion of the tank, is perfectly allowable.
In the embodiment shown, the top of the treating tank 14 is opened as aforesaid~ and the asphalt waste blocks are lifted up to the opening 14a by the elevator 28, to be automatically dropped into the water in the tank. If the elevator 28 is not used~ the asphalt waste 410cks may be directly thrown into the tank from the opening 14a by other means, for example, a shovel-dozer. The asphalt mixture to be treated is placed in the tank 14, and heated to the pre-determined temperature by the water which has been heated to aLso the predeter-mined temperature by the jetted steam stream from the boiLer 24. The asphalt :::
mixture thus sof~ened by the heating i3 disengaged by the separation means 16, while moving leftward (in the drawing). After the separating treatment, ~ 9 _ ' ' :
~.. C377~73 , the disengaged aggregate grains are sent to the sorting means 22 by the trans-portation means 18.
~ n example of the sorting means 22 will now be explained more specifi-cally. In the embodiment shown, a shaking screen is used as the sorting means 22~ The screen sieve is shaken as driven by the motor 30 and simultaneously moved from the right to left in the drawing, whereby sorting the material under treatment. In the specific embodiment, the material is sorted into four groups according to ~he grain si3es. Below the sorting means 24, four guide members 32, 34~ 36 and 38 are disposed to guide, respectively, the grains of the diameters ranging from 20 mm to 13 mm, from 13 mm to 5 ~m, from 5 mm to
This invention relates to an asphalt recycle system.
Conventional asphalt used for pavement works is normally thrown away as waste during road repairs. ~owever, such disposal of asphalt waste invites not only economical loss but also environmental pollution. Furthermore, the transportation of the waste consumes considerable time and cost. It is also unfavored from the standpoint of utilizing resources which is presently a world-wide problem.
Hence, a system which recycles asphalt has been searched for. The recycling or regenerative methods proposed in the past include that of heating the waste with high-frequency waves or directly with flame; that of exposing the wastetO steam; that of indirectly heating the waste with high-temperature oil; and that of crushing. None of these methods, however are commercially satisfactory~ for various reasons such as expense or qualitative degradation.
The present invention attempts to provide an asphalt recycle system of high practicability which can maintain the asphalt at the high quality level.
In a preferred system according to the invention, steam is supplied into water to regenerate the heretofore thrown away asphalt waste, and remark-ably improved treating effects are achievedO To wit, one of the essential features of the present invention resides in jetting steam into water, whereby the asphalt waste is heated in the presence of water.
According to the invention, the asphalt waste is sunk in water during both the heating and the separation (decomposition)~ This is an important feature of the invention. Use of steam also is an important feature, but it can achieve the desired effect only when used in combination with the water.
. .
; Therefore, the system is based on a fundamentally different principle from that of the recycle system in which the waste is heated when exposecl to an atmosphere of steam. Again, while various heating media are known, high-temperature steam is used in the invention to heat the asphalt waste in water.
``: ', .
; ~ . .
t77E~73 l I
, According to the present invention, there is provided a method o regenerating asphalt waste, comprising the steps of: jetting steam into water in a tank to make said water hot; sinking asphalt waste into said hot water in 4 said tank; heating said asphalt waste in said water to a predetermined temp-erature level to make said asphalt waste soft; and separating said heato~ and softened asphalt waste as sunk in said water by means of a mechanical separator thereby to make said asphalt waste disengaged into aggregate grains or elements each having the surfaces coated with a thin asphalt film In another aspect, the present invention provides an apparatus for regenerating asphalt waste, comprising: a tank for containing water to a predeterm~ned level; means for jetting steam into water in said tank to heat the water; and means for mechanically separating in the water the asphalt waste as heated and softened by the steam.
- The method of this invention permits the asphalt waste, when torn off from a paved road, to be treated. In other words, sorting or washing of the waste pieces is unnecessary. This is a great advantage in practicing the method. If a preliminaYy sorting or washing of the material is required ` before the regenerative treatment~ particularly when enormous volume of the waste is to be treated, the time and cost loss would be very serious.
Again according to the invention, because the asphalt waste is de-composed (separated) as softened and sunk in the water, the aggregate does not adhere to the separation tank or to other aggregates.
.
Furthermore, the separation (decomposition) of the asphalt waste as softened and sunk in the water produces another advantage that the individual aggregate grains are simply separated among one another~ but an aggregate grain itself is not brokon. This i~ very important, particularly in rolation to the strength. As is well known, the shape or configuration of the aggregate is an important factor in obtaining the predetermined strength of asphalt concrete. For this reason an asphalt ~e y~le system which destroys the .~
~C~778~3 aggregates, such as the crushing method, carmot be said practical. According to the invention the aggregates are simply separated into individual pieces while retaining the original shapes, and is free of the problem of strength - deterioration.
The present invention will now be described in more detail with reference to the accompanying drawings, in which:-Figure 1 is a schematic vertical section of an asphalt recyclesystem according to the present invention;
Figure 2 is a diagrammatic view of another asphalt recycle system according to the present inven~ion;
; Figure 3 is a schematic vertical section of a part of the asphalt recycle system shown in Figure 2, Figure 4 is a schematic view of still another asphalt recycle system according to the present invention; and Figure ~ is a side view of the system shown in Figure 4.
According to the invention~ first the heated steam is jetted into water in a tank, and into which the asphalt waste is sunk and heated to a predetermined temperature. Normally preferred temperature level of the waste ranges from 80 C to 100 C under the atmospheric pressure, particularly approx-- 20 imately 90 C. Obviously the temperature condition is variable under highly pressuri~ed atmosphere or under other unusual ambient conditions. Thus heated asphalt waste is separated by a suitable mechanical means as sunk in the water.
., For example, the asphalt waste is sunk in the water in the tank and heated at - 100 C for approximately 20 minutes, and disengaged into individual , grains in the water by means of, for example, a screw.
The mixture resulting from the separation according to the invention .
; consists of many aggregate grains each having the surfaces coated with a thin asphalt film. The sizes of the aggregates depend on those of the asphalt was~e ~ initially introdwced to the water. They may be uniform or various. The ; - 3 -~' ,i .
77873 , I
- asphalt coating on the surfaces oE a grain of the asphalt waste possesses strong adhering power to that particular grain, but exhibits no adhering tendency to other aggregate grains or the asphalt coating on their surfaces.
Therefore, the great number of aggregate grains each having the asphalt-coated surfaces are loose and mobile independently of each other. Consequently, they can be very easily sorted with sieves into the desired number of size groups if necessary.
- The asphalt coating on the aggregates' surfaces may contain a minor amount of an active substance. Preferably the amount of such an active sub-` 10 stance should range 5 to 20 % to the asphalt coating by weight ratio, inter ~` alia, approximately 10 %. (The ratio may be varied depending on the intended utility-of the product, type and dimensions of the aggregate, specific type - of the asphalt, etc.) While various active substances may be used, preferably ` active terra alba and active carbon are concurrently employed. It has been experimentally confirmed that favorable results can be obtained when the active ` component is composed of approximately 80 - 95 % of active terra alba and approximately 20 - 5 % of active carbon. Optimum results can be obtained, furthermore, when 90 % of active terra alba and 10 % of active carbon are used, although the results are to some extent dependent also on other condi-;~ 20 tions of use.
The asphalt coating may furthermore contain filler. The suitable filler content is widely variable depending on the intended utility of the product, but normally it is preferable to use approximately the same amount offfiller to that of the asphalt.
~: The mixture of the asphalt-coated aggregates of various grain sizes can be put to various usages as it is, but the field of its application can be still broadened when it is sorted into groups of approximately same grain sizes. For instance, the mixture may be diviclccl with sieves ;nto four size groups to be put to four separate usages as follows:
```'` , . ~ . - '1 -., :
77~7;3 (a) the grains having the diameters ranging from 20 mm to 13 mm; ~b) those of 13 mm to 5 mm; (c) those of 5 mm to 2.5 mm; and (d) those having the diameters less than ~.5 mm. It is also possible to blend the aggregates of those size groups at a suitable blend ratio.
~lereinafter some of the embodiments of this inven~ion will be ex-plained with reference to the attached drawings.
` First referring to Figure 1, a sheet of wire net 5, steam pipe 3, and a crusher or separator 6 are installed inside a tank 4 at sequentially lower position, by the order stated. The wire net 5 and the crusher or separator 6 may be omitted if so-desired. At the bottom of the tank 4, a means of transportation, for example, screw 8, is connected. The screw 8 can func-tion also as the means for separation, and therefore the asphalt can be suf-ficiently separated without the crusher or separator 6. The screw 8 is also connected to the lower edge of a hot elevator 9. A means for selection or sorting, for example, a shaking sieve 11, is located at the position to receive ` the asphalt waste dropped from the upper end of the elevator 9. The sieve ll is provided with the sorting pipes 13. The steam pipes 2 from the boiler 1 are connected respectively to the tank 4, hot elevator 9 and the screw 8, each containing as installed therein a porous steam pipe 3. The tank 4 and the hot elevator 9 are filled with water to the predetermined level X. Into the water ;- in the tank 4, heated steam is jetted through the pores in the steam pipe 3.
The operation of the above-described apparatus according to the ; invention will now be explained.
Blocks of asphalt waste 15 are thrown into the tank 4 from the ,` top, which can be efficiently accomplished with a shoveldozer. The blocks .; are first roughly sorted with the wire net 5. In the embodiment illustrated `:
'~ by Figure 1, the water level X in the tank 4 is set above the wire net 5.
Heated steam is jetted into the water in tank ~ ~rom thc boilor 1, through the steam pipes 2 and 3, to raise the temperature of the system to an appropriate ~';
_ 5 ~
;::
.
113~7~73 level, -for example, 90C. Thus heated asphalt waste is separated into the h~r ~ c~-f~
r~i aggregates with the ~n~r 6 and/or screw 8. Thus separated aggregates are ~ sent to the shaking sieve 11 by means of the hot elevator 9 where the aggregate are sorted into the desired number of groups according to their grain sizes.
Thus separated and sorted aggregates are mixed with a volatile liquid and an emulsifier to provide regenerated asphalt blocks (room tempera-ture asphalt blocks). It is also possible to obtain a regenerated asphalt mixture by heating the sorted aggregates. Thus the asphalt waste can be re-- generated and re-used for the conventional road-paving.
Now another embodiment of the asphalt waste recycle system according to the invention will be explained, referring to Figures 2 and 3O
Although two tanks 10 and 12 are shown in Figure 2, the number of tanks is optional. That is, a single tank or more than two tanks may be used depending upon particular needs. The tanks 10 and 12 are connected to the hot elevator 143 the other end of the ele~ator 14 leading to a screen sheet 160 The tanks 10 and 12 are also connected to a driving source 18 which is controlled by the regulating means 20. The tank 10 is connected to a boiler ~ 2~ so that a high-pressure and high-temperature steam may be sent into the : tank. Similarly the tank 12 is connected to the boiler 22 for sending a high-pressure and high-temperature steam. The boilers may be combined into " one.
The important features of the above-described construction will be explained in further detail with reference to Figure 3O The boiler 22 is provided with a plurality of pipes 26, a part of which are connected to the hot elevator 14, and another part to the inside of thc ~ank 12. The pipe 26a in the tank 12 is perforatod, and through tho many poros hoated stoam is jetted into the water~ At the bottom of tank 12 a separation mcilns 28 is installed. The separation means 28 used in the em`bodiMent is of screw type7 and the separation is effected as the materia~L under treatment moves from the 7'7873 , I
left to right in the drawing. The tank 12 is filled with water 30 to the level X. The hot elevator 14 is connected to the tank 12 by the pipe 260 The water level X is common between the tank 12 and hot eleva~or 1~. From above the tank 12 the asphalt waste blocks are thrown into the ~ank and heat-ed to the predetermined temperature in the high-temperature water. The blocks are then transferred to the right direction while being disengaged into in-dividual aggregate grains by the action of screw 28. Thus separated, aggre-gates are sent upward by the hot elevator 14 and further transferred into the sorting means 16 (for example, screen) to be sorted into size groups.
In this embodiment also the suitable temperature of water ranges from 80 C. to 100 C., particularly about 90 C. (The temperature is variable under special ambient conditions such as highly elevated pressure).
Incidentally the separation means 28 is not limited to the screw type. The sorting or screening means 1~ is preferably so designed that it can sort the aggregate grains into four groups according to their diameters, , respectively ranging (a) 20 mm - 13 mm (b) 13 mm - 5 rnm (c) 5 mm - 205 mm and (d~ less than 2.5 mm. ObviOuslyg sorting in different manner is perfectly acceptable as the occasion demandsO
` Referring back to Figure 27 each of the size groups sorted by the screening means 16 (to wit, the aggregate grains each having the surfaces ~ coated with an asphalt film which exhibits no adhesivenessto each other) is : sent to the respective feeder hopper. For example, the grains of the diameters ranging from 20 mm to 13 mm are sent to the feeder hopper 320 Those of the ` diameters ranging from 13 mm to 5 mm are sent into the feeder hopper 34;
those of 5 mm to 2.5 mm, to the feeder hopper 36; and those of less than 2.5 mmg to the feeder hopper 3~0 Similarly, the feeder hoppers 40, 42, 44 and 46 .
,., ~
- are provided to collect the aggregate grains of the diameters, respectively, ;~:
ranging from 20 mm - 13 mm~ 13 mm - 5 mm~ 5 mm - 2.5 mm~ and lcss than 2~5 mm.
The feeder hoppers 32~ 34, 36 and 3~ are provided with a conveyor 41 in common, ~C~7~ 73 which is movable to either right or left 'by the signa:L given by the controlling means 20. The conveyor 41 is also connected to a reserve feeder hopper 42 which is to accommodate any suitable mixture. Obviously~ more than one reserve feeder hopper may be installed if necessary. At one end of the conveyor 41~
a room-temperature dry asphalt blending means 43 is installed, which is fur-ther connected to a room-temperature pug mill mixer 48 through the conveyor 45.
The mixer 48 in turn is connected to a room-temperature asphalt storing means 52, through the conveyor 50. Any desired amount of the room-temperature asphalt can be suitably taken out of the storing means 52 as the occasion demands. On the other hand, a various heating dry asphalt blending means 54 .
is located at the other end of the conveyor 41. The dry asphalt blending '; means 54 is connected to a dry mixer 58 through a conveyor 56, and the dry mixer 58 is connected to a surge tank 62 through a conveyor 60. The heating asphalt mixture can be suitably taken out of the surge tank 62 as the occasion :~ demands. The aggregate of the grain sizes greater than 20 mm is wi~hdrawn to the direction of the arrow marked 64.
Furthermore, the feeder hoppers 32, 34, 36 and 38 are each provided with a valve, respectively, 32a, 34a, 36a and 38a. By controlling those valves with the controlling means 20, the blend ratio of the asphalt mixture can be ; 20 freely selected. Also the feeder hoppers 40, 42, 44 and 46 can provide each the asphalt mixture of uniform grain size, and have the valves 40a - 46a.
'~ A still another embodiment of the invention will now be explained with reference to Figures 4 and 5.
A mobile chassis 10 has wheels 12. In the illustrated embodiment, the system is run as a motor truck, the driver's seat being positioned at the left side. If required, however, the 'base lO may be separated from the ` driver's seat or the driving portion by employing a trailer system or any other suita'ble system, The treating tank 14 is mounted on the base lO, which is so eonstructed :~`
~7~3'73 ' :- ' that it can contain water to a predetermined level. At the lower portion of the tank 14 a separation means 16 is provided. The specific type of the separation means 16 is not critical, but in the embodiment shown, a screw system is employed. The separation means 16 is connected to a transportation means 18 which is a bucket-type elevator in the embodiment shown. The transportation means 18 is extended from the position of the separation means 16 to that above the treating tank 14, disposed with a slight inclination.
The transportation means 18 is driven by the motor 20. A sorting means 22 is loc~ted at the forward end of the transportation means 18.
The treating tank 14 is connected to a boiler 24 through the pipe 26 as shown in Figure 4, so that the water in the tank 14 is filled to the pre~
determined level is heated to the predetermined temperature by the steam jetted thereinto from the boiler 24. The type of the boiler 24 is not critical~
and the ~oiler itself is not novel. Hence, no detailed explanation of the boiler will be given.
The top of the treatment tank 14 has an opening 14a, which allows the entrance of the asphalt waste to be treated. Obviously, optional design change such as closing the top and providing an entrance at other portion of the tank, is perfectly allowable.
In the embodiment shown, the top of the treating tank 14 is opened as aforesaid~ and the asphalt waste blocks are lifted up to the opening 14a by the elevator 28, to be automatically dropped into the water in the tank. If the elevator 28 is not used~ the asphalt waste 410cks may be directly thrown into the tank from the opening 14a by other means, for example, a shovel-dozer. The asphalt mixture to be treated is placed in the tank 14, and heated to the pre-determined temperature by the water which has been heated to aLso the predeter-mined temperature by the jetted steam stream from the boiLer 24. The asphalt :::
mixture thus sof~ened by the heating i3 disengaged by the separation means 16, while moving leftward (in the drawing). After the separating treatment, ~ 9 _ ' ' :
~.. C377~73 , the disengaged aggregate grains are sent to the sorting means 22 by the trans-portation means 18.
~ n example of the sorting means 22 will now be explained more specifi-cally. In the embodiment shown, a shaking screen is used as the sorting means 22~ The screen sieve is shaken as driven by the motor 30 and simultaneously moved from the right to left in the drawing, whereby sorting the material under treatment. In the specific embodiment, the material is sorted into four groups according to ~he grain si3es. Below the sorting means 24, four guide members 32, 34~ 36 and 38 are disposed to guide, respectively, the grains of the diameters ranging from 20 mm to 13 mm, from 13 mm to 5 ~m, from 5 mm to
2.5 mm, and less than 2.5 mm. The guide members 32, 34, 36 and 38 are provided respectively with the valves 32a, 34a, 36a, and 38a. By the suitable valve ` control the blend ratio of the asphalt mixture can be varied as desired.
Also the three guide members 34, 36 and 38 are combined into one by the guide member 40. Incidentally, 32b is the exit from the guide member 32~ and 40a~
the exit from the guide member 40.
- The base 12 is furthermore provided with the power source 42, water - tank 44, and a fuel tank 46. The power source 42 is to drive the necessary motors, and for this purpose is connected to the motor 30 and motor 48 (for driving the separation means 16). The water tank 44 is connected to the boiler 24 through the pipe 50, aS well as to the treating tank 14. The fuel tank 46 is installed to supply fuel to run the boiler 24.
The aforedescribed parts may be manually handled, but in the shown embodiment they are automatically operated by the control device 52. The connection chart of the control device 52 and the individual parts is nok shown, but all the connections are eloctrica:l:Ly secured. ObviousLy, it is allowable to run some parts `by automatic control and the rest, by manual ;:
handling. It is le~t optional to the user's choice. A valve 26a and 50a is provided on pipe 26, and pipe 50 respectively.
- tO -
Also the three guide members 34, 36 and 38 are combined into one by the guide member 40. Incidentally, 32b is the exit from the guide member 32~ and 40a~
the exit from the guide member 40.
- The base 12 is furthermore provided with the power source 42, water - tank 44, and a fuel tank 46. The power source 42 is to drive the necessary motors, and for this purpose is connected to the motor 30 and motor 48 (for driving the separation means 16). The water tank 44 is connected to the boiler 24 through the pipe 50, aS well as to the treating tank 14. The fuel tank 46 is installed to supply fuel to run the boiler 24.
The aforedescribed parts may be manually handled, but in the shown embodiment they are automatically operated by the control device 52. The connection chart of the control device 52 and the individual parts is nok shown, but all the connections are eloctrica:l:Ly secured. ObviousLy, it is allowable to run some parts `by automatic control and the rest, by manual ;:
handling. It is le~t optional to the user's choice. A valve 26a and 50a is provided on pipe 26, and pipe 50 respectively.
- tO -
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of regenerating asphalt waste, comprising the steps of:
jetting steam into water in a tank to make said water hot; sinking asphalt waste into said hot water in said tank; heating said asphalt waste in said water to a predetermined temperature level to make said asphalt waste soft;
and separating said heated and softened asphalt waste as sunk in said water by means of a mechanical separator, thereby to make said asphalt waste dis-engaged into aggregate grains or elements each having the surfaces coated with a thin asphalt film.
jetting steam into water in a tank to make said water hot; sinking asphalt waste into said hot water in said tank; heating said asphalt waste in said water to a predetermined temperature level to make said asphalt waste soft;
and separating said heated and softened asphalt waste as sunk in said water by means of a mechanical separator, thereby to make said asphalt waste dis-engaged into aggregate grains or elements each having the surfaces coated with a thin asphalt film.
2. The method of claim 1, further comprising the step of: sorting said aggregate grains or elements into a predetermined number of size groups.
3. The method of claim 1, further comprising the step of: putting an active composition into said water in the tank before the asphalt waste is sunk in the water.
4. The method of claim 3 wherein said active composition comprises approximately 80 % to approximately 95 % of active terra and approximately 20 % to approximately 5 % of active carbon.
5. The method of claim 1 wherein said asphalt waste is heated to approximately 80 °C to approximately 100 °C under the atomospheric pressure.
6. The method of claim 5, further comprising the step of: putting the mixture of active terra of approximately 80 % to approximately 95 % and active carbon of approximately 20 % to approximately 5 % into said water in said tank; and sorting said aggregate grains or elements into a predetermined number of size groups.
7. An apparatus for regenerating asphalt waste, comprising: a tank for containing water to a predetermined level; means for jetting steam into water in said tank to heat the water; and means for mechanically separating in the water the asphalt waste as heated and softened by the steam.
8. The apparatus of claim 7, wherein said jetting means comprises steam pipes a portion of said pipe having a plurality of openings for steam so that the steam may be jetted into the water.
9. The apparatus of claim 8, further comprising: means for conveying grains or elements which are produced by separating said heated and softened asphalt waste in the water; and means for sorting said grains or elements into a predetermined number of size groups.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14824675A JPS5271519A (en) | 1975-12-12 | 1975-12-12 | Method of reclaiming waste asphalt materials and apparatus for carrying out thereof |
| JP5594576A JPS5944442B2 (en) | 1976-05-14 | 1976-05-14 | Manufacturing method for new asphalt mixture |
| JP5631776A JPS52139129A (en) | 1976-05-17 | 1976-05-17 | New asphalt mixture |
| JP5631876A JPS52139127A (en) | 1976-05-17 | 1976-05-17 | System for treating asphalt materials |
| JP5631976A JPS52139128A (en) | 1976-05-17 | 1976-05-17 | Treatment of asphalt materials |
| JP5723176A JPS52140530A (en) | 1976-05-20 | 1976-05-20 | Method of manufacturing asphalt materials of new type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1077873A true CA1077873A (en) | 1980-05-20 |
Family
ID=27550621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA267,584A Expired CA1077873A (en) | 1975-12-12 | 1976-12-10 | Asphalt recycle system |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA1077873A (en) |
| DE (1) | DE2656117C2 (en) |
| FR (1) | FR2334740A1 (en) |
| GB (1) | GB1513600A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109056464A (en) * | 2018-07-10 | 2018-12-21 | 黄山路之梦交通工程有限责任公司 | A kind of pretreatment mechanism of bitumen recovery |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5340391A (en) * | 1993-03-11 | 1994-08-23 | Reclaim, Inc. | Performance-modified cold-applied asphalt compositions |
| CN100519940C (en) * | 2004-12-29 | 2009-07-29 | 湖南力威液压设备有限公司 | Car borne pulling typed maintaining machine for asphalt pavement |
| CN110917941B (en) * | 2019-12-20 | 2023-08-11 | 长沙理工大学 | Old asphalt mixture oil-stone separation device with biological oil as solvent oil and use method |
| CN112900194B (en) * | 2021-01-14 | 2022-08-30 | 广东交工新材科技有限公司 | Waste asphalt recycling system and process |
| CN113442289B (en) * | 2021-07-28 | 2022-06-10 | 广西建设职业技术学院 | Preparation device and preparation method of construction waste recycled aggregate sound insulation mortar |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US505416A (en) * | 1893-09-19 | Arthur f | ||
| FR825325A (en) * | 1936-11-14 | 1938-03-01 | Routes Economiques Soc Gen Des | Process for the recovery of bituminous pavement coatings, based on asphalt and tarry binders |
| US2413908A (en) * | 1942-08-04 | 1947-01-07 | Pavements Reclaiming Corp | Apparatus for conditioning pavement material |
| FR930428A (en) * | 1946-07-10 | 1948-01-26 | Method and device for the regeneration of bituminous or tar-containing road surfaces |
-
1976
- 1976-12-10 GB GB5160876A patent/GB1513600A/en not_active Expired
- 1976-12-10 FR FR7637355A patent/FR2334740A1/en active Granted
- 1976-12-10 DE DE19762656117 patent/DE2656117C2/en not_active Expired
- 1976-12-10 CA CA267,584A patent/CA1077873A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109056464A (en) * | 2018-07-10 | 2018-12-21 | 黄山路之梦交通工程有限责任公司 | A kind of pretreatment mechanism of bitumen recovery |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2334740B1 (en) | 1979-08-17 |
| FR2334740A1 (en) | 1977-07-08 |
| GB1513600A (en) | 1978-06-07 |
| DE2656117C2 (en) | 1986-03-13 |
| DE2656117A1 (en) | 1977-06-23 |
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