KR20150145594A - Method of manufacturing aspalt comprising mineral powder microparticle - Google Patents

Abstract

More particularly, the present invention relates to a method of manufacturing an asphalt comprising a fine particulate mineral powder, and more particularly, to a method of manufacturing an asphalt comprising the steps of: storing an aggregate in a designated cold bin on a manufacturing process line according to a specification; storing the asphalt in a designated oil tank Collecting the fine particulate mineral powder and storing it in a silo on the production process line; and conveying the materials prepared by the material preparation step to the mixing means using respective designated conveying means Mixing and stirring the materials transported to the mixing means by the transporting step at a specified ratio to produce an ascon; and a step of collecting the ascon produced by the manufacturing step in a bulk (dump truck) or packaging form The aggregate coating effect is improved compared with the conventional ascon, It is possible to reduce costs by increasing the amount of palladium, increase resistance to plastic deformation, suppress deterioration of asphalt, excellent fluidity, excellent resistance to moisture (moisture sensitivity), and improved resistance to cracking Provided is a method for producing an asphalt containing ultra fine particle mineral powder whose lifetime is improved.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of manufacturing an asphalt containing microparticulate mineral powder,

More particularly, the present invention relates to a method of manufacturing an asphalt binder, and more particularly, to a method for producing an asphalt binder by using a fine particulate mineral powder satisfying the KS F-3501 standard as a filler of an ascon, The present invention also relates to a method for manufacturing an asphalt containing fine particle-based mineral powder capable of reducing the cost of road pavement by reducing the amount of asphalt used.

Generally, the pavement is a road surface structure treated to improve the road surface and improve the flatness of the road to facilitate human traffic and running of the vehicle. The pavement structure is a multi-layered structure in which a plurality of layers are stacked, .

The layered structure of the above-mentioned pavement is largely divided into a surface layer, an intermediate layer (which may be abbreviated according to the package design) and an auxiliary layer, and the surface layer is required to receive a load to maintain a smooth surface, In addition, it should be able to resist friction and freeze and melt fracture due to its drainage ability. The main role is to disperse the load acting on the surface layer and transfer it safely to the road below the bedrock.

Asphalt pavement is classified into three types of asphalt pavement (ascon) pavement, concrete pavement and block pavement depending on the material of the surface layer. Asphalt pavement is composed of aggregate such as asphalt or hardened crushed stone of the tar, Packaging, tar packaging, etc. Currently, it occupies most of the world's roads, and there are various kinds.

In the case of road pavement, the ascon pavement is finished by compaction process by laying each ascon according to the blend design for each layer such as surface layer, middle layer, and auxiliary layer.

Asphalt pavement is less expensive than concrete pavement, but it is more advantageous than concrete pavement because of long-term maintenance cost.

These ascon is composed of aggregate, asphalt (A.P.), and mineral filler (Mineral Filler) which is a filler as a packing material for major roads together with cement concrete.

The above-mentioned ascon is a basic element of the package structure material together with the aggregate and the aggregate aggregate. The asphalt is viscoelastic and imparts the bond and elasticity of these aggregate materials. Finally, the filler fills the gap between the aggregates, To increase the interfacial bonding force between the asphalt and the aggregate, and to increase the elasticity of the ascon.

However, even if the conventional asbestos containing LS (limestone powder) is pave the road, plastic deformation such as a wheel is caused by a heavy vehicle and high temperature after the road pavement construction, and after several years, Cracks occurred due to the action.

As the water content in the interface between the asphalt binder and the aggregate penetrates, peeling occurs. The cause of the deformation of the road pavement easily due to the external weather conditions is the viscoelastic behavior of the asphalt due to temperature and time, There is a problem that the adhesion force is weakened or lost due to the energy difference.

For this reason, in the method disclosed in Japanese Patent Application Laid-Open No. 10-2002-0000613 (2002.01.05), the first step of heating the waste lime stone at a high temperature of 1000 ° C or higher to remove the carbon monoxide contained therein to obtain a filler in the form of a white powder, And a third step of mixing stones, sand and sand to be pulverized to ψ19 mm or less in the mixture, and a second step of mixing the asphalt with asphalt at a temperature of 140 to 160 ° C. to obtain a mixture, However, the conventional technique is also insufficient to overcome the above-mentioned conventional problems.

As described above, the breakage of the ascon occurs due to various causes. In order to overcome this problem, the present invention has been made to overcome the above-mentioned disadvantages of the prior art asphalt, including the ultra fine particle mineral powder, , Resistance to plastic deformation is increased, deterioration of asphalt is suppressed, fluidity is excellent, resistance to moisture (moisture sensitivity) is excellent, resistance to cracks is improved, and the life of the package is improved A method for producing an asphalt containing a fine-particle-mineral powder is provided.

The method for manufacturing an asbestos-containing asphalt composition according to the present invention comprises the steps of storing and storing aggregates in designated cold bins on a manufacturing process line according to specifications, storing and storing the asphalt in a designated oil tank on a manufacturing process line, Collecting and storing the particulate mineral powders in a silo on a manufacturing process line; Transferring the materials prepared by the material preparation step to the mixing means by using respective designated transfer means; Mixing and stirring the materials transferred to the mixing means by the transferring step at a specified ratio to produce an ascon; And shipment of the ascon produced by the manufacturing step in a bulk (dump truck) or package form as a designated unit.

At this time, in the preparation of the material according to the present invention, the collection of the ultrafine particulate mineral powder is carried out by collecting the ultrafine particulate mineral powder through the dust collecting facility provided on the upper part of the cement kiln used in the production of the cement, A step of removing foreign matter and selecting a particle size of a predetermined particle size; and a step of grinding the ultrafine-particle mineral powder mass classified into particles larger than the designated particle size selected in the sorting step, And moving the ultrafine particulate mineral powder sorted by particle size to the designated silo in the sorting step.

In the step of selecting the particle size according to the present invention, only the ultrafine particulate mineral powder particles satisfying the requirements of KS F 3501 are selected, and the ultrafine particulate mineral powder may be made of CKD (cement kiln dust).

In addition, the aggregate conveyed to the designated conveying means in the conveying step according to the present invention can be conveyed while being dried by heat or hot air at 120 to 180 ° C, and the asphalt conveyed to the designated conveying means is maintained at a temperature of 120 to 180 ° C It can be conveyed while heating.

In the manufacturing process according to the present invention, the blending ratio of the ultrafine particulate mineral powder is preferably 1 to 25% of the total weight of the ascon.

The method for manufacturing an ascon product including the ultrafine particulate mineral powder according to the present invention has the following effects.

First, the viscosity of the asphalt increases as the content of the ultrafine particulate mineral powder increases by a factor of two or more because of the correlation between the asphalt and the ultrafine particulate mineral powder. Thus, the viscosity of the asphalt is improved and the effect of the aggregate coating is improved. To provide an ascon that can save.

Second, the inclusion of the fine particulate mineral powder in the asphalt greatly improves the performance at high temperatures to increase the resistance to plastic deformation. Third, when the fine particulate mineral powder is contained in the asphalt, the deterioration of the asphalt is suppressed, It has an effect of providing an ascon.

Thirdly, the ascone containing the ultrafine particulate mineral powder has the dynamic stability of wheel trekking increased by more than 10%, and the settlement depth improvement by 10 ~ 50% Sensitivity), improved resistance to cracking, improved compaction, and suppression of moisture penetration in the package, thereby providing an ascone in which the life of the package is increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram briefly showing a method of manufacturing an ascon product including a fine particulate mineral powder according to the present invention.
FIG. 2 is a schematic view illustrating an ascon production process according to the present invention.
FIG. 3 is a block diagram showing a step of collecting the ultrafine particle mineral powder in the material preparation step according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, at the time of the present application, It should be understood that variations can be made.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram briefly showing a method for manufacturing an ascon product including the ultrafine particle mineral powder according to the present invention. FIG. 2 is a schematic view illustrating an ascon production process according to the present invention, and FIG. FIG. 2 is a block diagram showing the steps of collecting the fine particulate mineral powder in the material preparation step.

The present invention includes a fine particulate mineral powder satisfying the criteria of KS F-3501 in the KS standard as a filler material of the ascon, and thus the modifying effect of the asphalt binder is excellent, thereby increasing the compatibility of the asphalt pavement and reducing the amount of the asphalt used The present invention relates to a method of manufacturing an asphalt containing ultra fine particle mineral powder that not only can reduce the cost of road pavement construction but also provides an improved asphalt durability, and will be described in more detail with reference to the drawings.

1 and 2, the method for manufacturing an asbestos-containing asphalt composition according to the present invention comprises a material preparing step (S100), a conveying step (S200), a mixing step (S300), and a shipping step (S400) The manufacturing process of each step is as follows.

First, in the material preparing step S100 for preparing the material for manufacturing the ascon,

(S120) of storing the asphalt in a designated oil tank (200) on a manufacturing process line (S120), storing the aggregate in a designated cold bean (100) And then storing and storing the silo in a silo (300) on a manufacturing process line (S 130).

Here, the aggregate and the asphalt are the aggregate and the asphalt contained in the conventional ascon, and a detailed description will be omitted.

The collection of the ultrafine particle mineral powder in the material preparation step (S100) is performed by collecting the ultrafine particle mineral powder through a dust collecting facility provided on the upper part of the cement kiln used in the production of the cement (S110) (S120) of removing foreign matters from the collected ultrafine particulate mineral powder, and sorting the ultrafine particulate mineral powder particles classified into particles larger than the designated particle size selected in the selecting step (S120) (S130) of moving the pulverized powder to a screening line (S130), and a step (S140) of moving the ultrafine particulate mineral powder sorted by particle size to a designated silo in the selecting step (S120).

At this time, it is preferable to select only the ultrafine particle mineral powder particles having a size of 75 mu m or less (not including 0 mu m) in the step of selecting by the particle size (S120).

If the extreme particulate mineral powder selected in accordance with the present invention is a CKD (cement kiln dust) component, the quality standard of the filler according to KS F-3501 should be satisfied. Fillers that are mixed with the ascon should have a moisture content of less than 1%, contain no harmful substances, and have a particle size as shown in Table 1 below.

The nominal index of the sieve (㎛) Sieve Pass Weight Percentage (%) 600 100 300 95 or higher 150 over 90 75 70 or more

It shall also comply with the requirements in [Table 2] below.

Item standard Plasticity index 6 or less Flow test Less than 50% Flooding expansion 3% or less Peel resistance Less than 1/4

As shown in [Table 3] below, the chemical major component of CKD (cement kiln dust), which is a very fine particulate mineral powder, can be applied as a filler as CaO.

CKD (Cement Kiln Dust) 10-20 4 to 6 4 to 6 60 to 80 2 to 3 LS (limestone) 1-2 0.2 to 0.3 0.1 to 0.2 80 ~ 90 0.5 to 1.0

The comparison with the quality standard of KS F-3501 is as follows. [Table 4] shows that CKD (Cement Kiln Dust) which is a very fine particulate mineral powder meets KS quality standard and CKD (Cement Kiln Dust) Since the particle size is composed of fine particles, it shows a high throughput even at 75 μm.

Although the specific gravity is not mentioned in the KS regulations, CKD (cement kiln dust), which is a fine particle mineral powder, is also similar to LS (limestone powder) which is usually used as a filler, but the specific gravity must be reflected in the design of the ascon This includes only the analysis of the filler quality.

Item KS standard CKD
size
(탆)
600 100% 100% 300 95% or more 100% 150 over 90 100% 75 More than 70% 95 to 100% Water content (%) 1.0 or less 0.1 to 0.3 Plasticity index 6 or less N.P Flow test (%) Less than 50 32 Inundation expansion (%) 3 or less One Peel resistance Less than 1/4 Less than 1/4 importance - 2.65 to 2.75

As a result of analysis of CKD (cement kiln dust) and LS (limestone powder) particles according to the present invention, the particle size and particle size distribution were measured using an ultrasonic particle size analyzer as shown in Table 5 below. vol% of CKD particles were analyzed, which means that the particle size of CKD is 6 times smaller than LS and 10 times larger than LS.

When the particle size of the filler is less than 10 탆, the aggregate coating effect is relatively good because the asphalt forming the coating of the aggregate and the filler behave together when the asphalt mixture is prepared.

Sample D (탆) at volume 10% D (탆) at volume 90% Middle D (탆) CKD 0.4 to 0.5 20 to 55 3 to 5 LS (limestone) 1-2 100-120 30 to 40

5 탆 or less (%) 10 ㎛ or less (%) 20 탆 or less (%) CKD 55 ~ 65 50 to 90 90-100 LS (limestone) 15-25 20 ~ 30 35 to 40

Table 6 shows the vol% passing through each of the particle sizes of 5 탆, 10 탆 and 20 탆. As a result, CKD (cement kiln dust), which is a very fine particle mineral powder at a size of 5 탆 or less, As compared with the case where the fine particles are three times or more, the filler has good flowability with the asphalt, thereby improving the productivity and coating coating effect.

In addition, when the fine particles move asphalt, there is a risk of reducing the fluidity of the mixture by expanding the asphalt bind (increasing the viscosity). Therefore, it is necessary to use an appropriate microparticulate powder (CKD (cement kiln dust) ) Is preferably calculated and reflected.

Accordingly, when producing the asphalt mixed with the ultrafine particulate mineral powder according to the present invention, the ultrafine particulate mineral powder is mixed with the asphalt to increase the amount of the asphalt, thereby reducing the amount of the asphalt used and improving the quality of the asphalt (45% ~ 60% of the total cost of ascon) can reduce the amount of asphalt used, which contributes to cost reduction.

And a transfer step (S200) of transferring the stored material to the mixing means,

The materials prepared by the material preparation step (S100) are transferred to the mixing means (400) using the respective designated transfer means (110, 210, 310).

As the conveying means 110 for conveying the aggregate, a cold feeder, a belt conveyor, a cold elevator or the like can be used as the conveying means 110. The aggregate conveyed to the designated conveying means 110 is conveyed to the dryer 120-180 Lt; RTI ID = 0.0 > C, < / RTI >

This is to remove the moisture contained in the aggregate and to improve the coating property of the asphalt.

The asphalt is transferred to the mixing means 400 by a supply line and a supply pump which are the transfer means 210 connected to the designated oil tank 200. At this time, an oil heater is provided on the supply line to transfer the asphalt And heated to a temperature of 120 to 180 ° C.

The extreme-fine-grain-mineral powder may also include a conveying screw, an elevator or the like as the conveying means 310 and may include a crushing means to prevent aggregation of the extreme-fine-particle mineral powder conveyed to the designated conveying means 310.

In the manufacturing step S300 for manufacturing the ascon by mixing the materials,

The ascon is manufactured by mixing the materials transferred to the mixing means 400 by the transferring step S200 at a specified ratio.

At this time, the aggregate is conveyed by the conveying unit 110, and when the aggregate is fed into the mixing unit 400, the aggregate passes through the screen screening unit 410 and separates the aggregate by size. And then discharged to the mixer 430 through the aggregate weighing device and metered by the aggregate size according to the mixing design of the ascon.

The specified amount of the asphalt is jetted by the nozzle located above the mixer 430 according to the blend design of the ascon, and the ultrafine particulate mineral powder is also metered by the metering device, and the designated amount is input according to the blend design of the ascon.

In this case, the mixing ratio of the fine particulate mineral powder is preferably limited to 1 to 25% of the total weight of the ascon.

The aggregate, asphalt, and fine particulate mineral powder put into the mixer 430 are agitated in the mixer 430 for a designated time to produce an ascon.

The shipment stage (S400) for shipment of the manufactured ascon,

The ascon produced by the manufacturing step (S300) is shipped in bulk (dump truck) or packed form in designated units.

The above-described shipping step is the same as a normal ascon shipping step, and a detailed description thereof will be omitted.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: cold bean
200: Oil tank
300: Silos
400: mixing means
410:
420: Heartbeat
430: Mixer

Claims (7)

Storing the aggregate in a designated cold bin on a manufacturing line by standard, storing the asphalt in a designated oil tank on the manufacturing line, storing the fine particulate mineral powder in a silo on the manufacturing line, ≪ / RTI >
Transferring the materials prepared by the material preparation step to the mixing means by using respective designated transfer means;
Mixing and stirring the materials transferred to the mixing means by the transferring step at a specified ratio to produce an ascon; And
And discharging the ascon produced by the manufacturing step in a bulk (dump truck) or packaged manner in a designated unit.
The method according to claim 1,
In the material preparation step, the collection of the fine particulate mineral powder
Collecting the fine particulate mineral powder through a dust collecting device provided on an upper portion of a cement kiln used for manufacturing cement;
Removing foreign matter from the collected ultrafine particulate mineral powder and sorting it with a specified particle size;
Wherein the ultra fine particle mineral powder mass classified into particles larger than the designated particle size selected in the sorting step is moved to a pulverizer, pulverized, and then re-supplied to the selection line; And
And moving the ultrafine particulate mineral powder sorted by the particle size to a designated silo in the sorting step.
The method of claim 2,
In the step of sorting by the particle size
A method for manufacturing an asphalt comprising an extreme-fine-particle mineral powder which is selected only for extreme-fine-particle-mineral powder particles of a size that meets the requirements of KS F 3501.
The method according to claim 1,
The ultra fine particle mineral powder
A method of manufacturing an ascon product comprising a fine particulate mineral powder consisting of CKD (cement kiln dust).
The method according to claim 1,
In the transferring step
And an extreme-fine-particle mineral powder for transferring the aggregate conveyed to the designated conveying means by drying with hot or hot air at 120 to 180 占 폚.
The method according to claim 1,
In the transferring step
And transferring the asphalt transferred to the designated conveying means while heating to maintain the temperature at 120 to 180 캜 while heating the asphalt.
The method according to claim 1,
In the manufacturing step
Wherein the mixing ratio of the ultrafine particulate mineral powder is 1 to 25% of the total weight of the ascon.

Images