JPS60120757A - Method and apparatus for producing asphalt mixture heated by heat exchange utilizing waste bituminous paving material - Google Patents

Abstract

PURPOSE:To obtain a reclaimed asphalt mixture of stable quality similar to a new material, by mixing a material to be reclaimed, obtd. by crushing a waste bituminous paving material, with a new aggregate heated to a specified temp. to thereby effect heat exchange therebetween. CONSTITUTION:A waste material obtd. by cutting asphalt-paved plates with a cutter or crushed waste material obtd. by a crusher is placed in a waste material bin 8. Asphalt, an aggregate, the waste material, stone powder, etc. are weighed by metering tanks 4a, 4b, 4c and introduced into a mixer where they are mixed together in such a proportion that a mixture consisting of the asphalt, the aggregate, the stone powder, etc. accounts for 100pts.wt. The mixing ratio of these components varies according to the quality of the waste material, the particle size of the new aggregate, the purpose of use, temp. change, etc. During mixing in the mixer, the waste asphalt material, the asphalt, the stone powder, etc. are mixed with the new aggregate heated to 200-250 deg.C, whereby the temp. of the mixture approaches about 160 deg.C which is the desired temp.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a heat exchange heated asphalt mixture using bituminous pavement waste.

Since the oil shock, the use of heat from asphalt waste generated during early repair of existing asphalt pavement has been affected by the dramatic rise in oil prices and unstable oil supply. As asphalt m materials were included as industrial waste under the ``Act on Processing and Cleaning of PA Fruits'', the development rapidly progressed from the perspective of dealing with disposal sites. It's coming.

What are the uses of recycled composite materials from those waste materials?

(Recycled roadbed using road mixing method for 11 light pavement.

(2) Recycled roadbed material mixed in a plant, (3) Regenerated heated composite material mixed in a plant, etc., which are mainly used as an alternative material when Ascon is used only for the surface layer of light pavement or simple pavement. is the current situation.

In addition, regarding the manufacturing method of the recycled mixed material (S), the proportion of waste material as aggregate in the recycled heated mixed material is 80 to 10%.
The drum dryer sound mixing method, which occupies a 0.0 hour hour wheel, is generally adopted, but this method has the disadvantages of introducing a drum dryer mixing method, requiring a large amount of equipment cost, and the fact that the asphalt in the waste material ages considerably. In high-rate utilization, the waste material is reheated, so a softening agent is required to correct the penetration due to problems such as compaction flexibility, and the problem is that the waste material used is It varies depending on the location, and because of the drawbacks such as the instability of recycled composite material, such as the fact that it becomes unstable due to these influences, it is not allowed for limited use on the top layer of the road surface.

The present invention solves these difficulties and provides a recycled composite material of stable quality using a softener with a small equipment cost.
The aim is for the scope of use to be equivalent to that of new composite materials. The basic concept of the production method of the asphalt mixture according to the present invention is that the mixed material is not manufactured using 100 pieces of asphalt waste (normally, new mixed material is manufactured in an asphalt plant during mixing during the filtration process). This method attempts to reuse late wood by mixing a percentage of waste materials at room temperature and heating them indirectly through the heat radiation of the new composite material. With this new knowledge, the aggregate and recycled material are subjected to a primary heat exchange in a measuring tank and a mixer, and then the filler and heated new asphalt are put into the mixer in that order and kneaded, during which a secondary heat exchange is performed. When producing a heat exchange heated asphalt mixture, the heat exchange heated asphalt mixture 100
The mixing ratio of the recycled material to the city part is lO ~ 45jJ
Lt part, and the heating temperature of the heated new aggregate is 20
The present invention relates to a method for producing a heat exchange heated asphalt mixture using bituminous waste material, characterized in that the temperature is in the range of 0 to 250C. According to this generation Ij, which is made up of the above S configuration, during mixing, what percentage of the waste material of ρ is mixed in at room temperature to 1, and is heated indirectly by the heat dissipation of the backing material, so the drum dryer mixing method is not suitable. There is no need for installation, and by simply installing coloring, which is automatically fed into a mixer at room temperature, into a conventional asphalt plant, it is possible to produce composite material that recycles waste materials. Since the mixing ratio is 10 to 45ii 1 part, it is unnecessary to use a softener for correction of Kendaido, and since the mixing rate of discontinued publications is low, it is also effective against fluctuations in the quality of supplied waste materials. It has many excellent effects, such as greatly reducing the effects of lotus. Embodiments of the present invention will be explained below based on the drawings. The first picture is a schematic diagram of the plant.

The asphalt plant 1 has a dryer 2 with a tillage structure in the main part.
A total of 1 (:t'! 4a, 4b, 4c) are arranged on the top of the mixer I73, and the measuring tank is 4a for stone powder, 4b for aggregate, Separated into 4C for asphalt and V tank 4a for stone powder, stone powder is transported to stone powder elevator 5.
A stone dust bin 6 is installed to store the discontinued publications through a waste book puff 8 and a dryer 2 heats and stores the bone tissue heated in the dryer 2. A hot bin 9 is provided for this purpose.

A screen 10 is sometimes arranged above the hot bin 9, and between the screen 10 and the discharge port of the dryer 2, a screen 14 is provided.
．． A hot elevator 11 is provided to transport the cargo.

The dryer 2 has 13% dry Zyclone and 14% wet Zyclone between it and the smoke tube 12. Exhaust fans 15 are arranged one after another, and the dry cyclone 13 is configured to be able to heat a hot air pipe 13a connected to the hot elevator 11.

Further, the waste material hopper 7 discharges a predetermined amount of waste material using a belt feeder (not shown), and transports and stocks the waste material into a scrapping bin 8 using a belt conveyor (not shown). When a command is issued from the operation room of the plant main body (not shown), a screw conveyor (not shown) of the Q@bin 80 is activated, and the aggregates are cumulatively weighed into the measuring tank 4b of the plant main body together with the heated aggregate in the hot bin 9, and then fed into the mixer 3. It is configured so that

After dry mixing, asphalt is added from the asphalt measuring tank 4c, wet mixing is performed, and the recycled mixture is mixed. The dryer 2 is mounted on a support 17, and a rotating body 2C is rotatably installed at the axial center between the base end structure 2a and the upper end structure 2b via a drive mechanism (not shown). . In the drawing, 2d is a burner, 2e is a flame, 2f is an exhaust port, and 0.2g is an input port.

The rotating body 2C is a cylindrical body, and is divided into a flame part 2h, an inner wall part 21, and an inlet part 2j from the base end.
As shown in Fig. 3, there is an auxiliary blade 18 in the shape of a broken circuit.
are arranged radially on the inner wall surface of the cylinder with respect to the center P. In the inner wall portion 21, as shown in FIG. 4, scraping blades 19 are arranged on the cylindrical inner wall surface in a radial arrangement with respect to the center P. As shown in FIG. 6, the raking blade 19 is formed into a substantially U-shape by arranging test plates 19b, 19b on a broken-circuit base portion 19a. The symbol -Q19C in the figure is the stationary phase of the fence plate.

As shown in FIGS. 5 and 7, the input port 2j has
Plate-shaped backflow prevention blades 20 are arranged on the inner wall surface of the cylinder radially with respect to the pinch center P and inclined with respect to the axis passing through the pinch center P.

However, flame 2e has a cylinder atmosphere of 200~250C &
It has been adjusted to allow for new aggregate 1 from the input port 2g.
6 and rotate the rotating body 2C. In this step, the backflow prevention blade 20 prevents the bone phase from flowing back toward the upper end structure 2b and transports the bone phase to the center of the dryer. The scraping blades 19 scrape up the bone material that has fallen on the bottom of the inner wall of the rotating body 20 upwards onto the peripheral wall, and drop the aggregate 16 from between the fence plates 19b to the upper part.
As shown in Fig. 8, the particles are allowed to fall evenly like seeds falling onto the cylinder of the rotating body 2C, thereby promoting heat absorption into the aggregates on an average basis. This means that the content of recycled materials ranges from 10% by weight to 4% by weight.
As the amount of new aggregate increases to 5%, the amount of new aggregate decreases, so if there is a large amount of sr backbone material, it will fall in a descending manner, and if there is less sr. A fence board 19b is installed so that it hangs securely.

Next, in the flame part 2h, the aggregate 1 is
By scooping up the flame 2e along the peripheral wall and not dropping the aggregate 16 at the top of the cylinder of the rotating body 2C, but dropping the aggregate 16 only at the side of the cylinder, the progress of the flame 2e is not obstructed by the aggregate. The coarse bone and fine aggregate are mixed on the cylindrical side, and during this time heat exchange occurs between the aggregates, making it possible to easily reach the desired temperature. With the above configuration, the aggregate 16 is in the dryer 2 with a
250 Uo) i ([4, The heat is heated arbitrarily and is discharged from the discharge port 2f, and is temporarily stored in the hot bin 9 via the screen 10 by the hot elevator 11. Since the aggregates are sent through the dry cyclone 13 and kept warm, the aggregates heated by the dryer 2 do not cool down in the hot elevator 11, and the hot bin 9 is also kept warm.

The waste material bin 8 collects 1 μl of waste material obtained by previously cutting asphalt paving boards with a cutting machine or crushed by a crusher. Asphalt, aggregate, waste stone powder, etc. are weighed from the six tanks 4a, 4b, and 4c, respectively, and charged into the mixer 3 to be mixed. Asphalt) t is the value obtained by multiplying the extracted asphalt t4r of the waste material by the mixing rate, and 1 value of new asphalt is added. Asphalt, aggregate, 100 parts by weight of the primary mixture of 5 to 100 parts by weight of asphalt waste material
5. Mix appropriately within the range of 50%. These mixing ratios are determined by taking into consideration the quality of the island phase, the particle size of the new bone phase, the purpose of use, and fluctuations in temperature. During the mixing process by mixer 3, asphalt waste, asphalt, stone powder, etc. are heated to 200 to 250C. Heat is exchanged and mixed by the new bone phase, and the target temperature of the mixture approaches 160c.

! j [Electrical setting for heating temperature of aggregate is based on outside temperature, transportation F9i
[Copper strips vary depending on time. When the air temperature is 19 to 20 U, the thermal temperature of bone aggregate based on %+r is 200 C when the mixing rate of light material is 10%, 220 T when it is 20%, 2 when it is 30%.
When the temperature is 35m and 45%, 250C is used as a guideline to bring the target temperature of the mixture closer to x60U.

The recycled composite material thus produced is used in the same manner as general conventional composite materials. Marshall test and wheel tracking test (test temperature 6oc, ground pressure 6.4 h-9/a) were conducted to check the mechanical properties of the road surface paved using these
d), and repeated bending test (specimen size 3X3X4
0 crn% span 30 strokes 2 point loading method 1 frequency 511
．． ) are shown in Figure 410, Figure 11, and Figure 12.
According to this, the dynamic stability of recycled mixtures containing 20 to 45% waste materials is about 1.5 times greater than that of new mixtures (
In addition, the dynamic stability after one year of construction has increased, and it can be said that it has excellent flow resistance and is extremely stable against second dengue after being in service.

The number of repeated failures of the recycled mixture at low temperatures increases as the island phase mixing rate increases, and the results one year after construction show that this correlation shows that the recycled mixture has a higher failure w1 than the new mixture. The number of cycles is large (it can be said that it has excellent durability at low temperatures.

[Brief explanation of drawings]

The drawings relate to the present invention; FIG. 1 is a schematic diagram of an asphalt plant, and the second diagram is a cross-sectional end view of a dryer. Figure 3 is a side view of A-A in Figure 2, Figure 4 is a sectional view taken along line B-B in Figure 2, Figure 5 is a cross-sectional view taken along line C-C in Figure 2, and Figure 6 is a cross-sectional view taken along line C-C in Figure 2. Figure 7 is a perspective view of the lifting vane, Figure 7 is a perspective view of the backflow prevention vane, Figure 8 shows the rotation of the rotating body, and Figure 9 shows the rotation of the rotating body. Fig. 2 is the 8-section cross-sectional view, Fig. 1O is the Marshall stability test result table, Fig. 11 is the deformation rate table for cut specimens, Fig. 12 is the destructive bending test result table. l... Asphalt plant 2... Dryer 2a... Base end structure 2b... Upper end structure 2c... Rotating body 2d... Burner 2e.
...Flame 2f...Outlet 2g...Inlet 2h 11. Flame part 21... Inner wall part 2j... Input port part 3... Mixer 4a... Meter stitch for stone powder 4N 4b... Meter Pit for aggregate
Tank 4 c-゛° asphalt meter Tank 5... Stone powder elevator 6... Stone powder bin 7... Waste material hopper 8... Waste material bin 9... Hot bin 1o
... Screen 11 ... Hot elevator 12 ... Smoke tube 13 ... Dry Zyclone 14 ...
Wet Zyclone 15...Exhaust fan 16...Aggregate 1
7... Support column 18... Auxiliary blade 19... Raking blade 19a...
Base part 19b...Horizontal plate 19c...Fixing material 2o.
・・Backflow prevention blade, if'Jin 1

Claims (1)

[Claims] (11f!A) Crushing blue pavement waste material to make recycled material,
When manufacturing a heat exchange type heated asphalt mixture, the heated new aggregate and recycled material are mixed in a mixer for heat exchange, and the first filler and the heated fIF standard asphalt are charged into the mixer in that order and kneaded. , the mixing ratio of the recycled material is 10 to 451 parts per 100 parts of the heat exchange type heated asphalt mixture, and the heating temperature of the heated new aggregate is in the range of 200 to 250 c. A method for producing a heat exchange heated asphalt mixture using bituminous pavement waste. (2111 A dryer in an asphalt plant that heats aggregate is a cylindrical body that extends from the aggregate input port to the burner port with an inclination that allows the aggregate to rotate and slide down. , auxiliary blades are installed in a shape that allows the aggregate to swamp and move around the entire circumference of the cylinder without inhibiting the progress of the flame, and the aggregate is placed in the cross section of the cylinder on the inner wall of the cylinder beyond the flame part of the burner. A heat exchange type using bituminous pavement FJF material, which is equipped with scraping blades capable of uniformly distributing oJ and equipped with blades to prevent backflow of aggregate on the inner wall of the cylinder near the aggregate input port. Equipment for producing heated asphalt mixture.