KR102551031B1 - Method for pavement road to prevent black ice using MWCNT heating concrete module - Google Patents

Abstract

The present invention relates to a precast concrete panel for paving black ice prevention road pavement using a MWCNT heating concrete module, which prevents the occurrence of black ice on a road on which a vehicle travels through a combination of a heating part and a precast concrete panel, and frees CNTs. Its purpose is to extend the lifespan of road pavement by manufacturing it to have the same texture as the cast concrete body and satisfying both heat generation and pavement.
A precast concrete panel for black ice prevention road pavement using the MWCNT heating concrete module according to the present invention includes a concrete panel body; It includes a heating concrete module formed in a buried type with a surface exposed inside the concrete panel body, and the heating concrete module is made in the form of a hexahedron with a mixture of MWCNTs, water, cement, and sand as a composition, the cement 100 It consists of a mixture of 45 to 55 parts by weight of water, 240 to 260 parts by weight of sand, and 0.5 to 1 part by weight of MWCNTs having a diameter of 1 nm to 10 nm and a length of 100 nm to 1 cm.

Description

Method for pavement road to prevent black ice using MWCNT heating concrete module}

The present invention relates to a precast concrete panel for preventing black ice for road paving, and more particularly, by applying the heating characteristics of a heat generating unit (MWCNT) to a precast concrete panel for road paving to prevent black ice, thereby preventing black ice in winter. It relates to a precast concrete panel for road paving to prevent black ice using a MWCNT heating concrete module that prevents occurrence.

This section provides background information related to the subject matter of this application and is not necessarily prior art.

Black ice, which has recently emerged as a major factor in large-scale traffic accidents in winter, is a phenomenon in which water or snow penetrates through small gaps in the surface of asphalt or concrete and freezes.

According to the traffic accident analysis system of the Korea Road Traffic Authority, there were about 6,500 accidents on icy roads caused by black ice between 2014 and 2018, about 1.8 times more than accidents caused by heavy snow accumulation, twice as many injured people, and more than three times as many deaths. , the mortality rate was more than 1.9 times higher.

Snow removal materials are being sprayed to prevent accidents caused by black ice, but roads are already frozen due to sub-zero weather, resulting in heavy traffic congestion and many accidents.

In addition, in the case of road asphalt pavement, continuous damage occurs due to plastic deformation and fatigue cracking.

In asphalt pavement, maintenance is performed considering only the aesthetics of the surface by repeatedly covering the upper surface layer (5cm) on the pavement where the deformation of the lower base layer has occurred, increasing the durability of the road as well as the risk of black ice in winter.

Fundamental repair and reinforcement for ground subsidence and internal cracks due to plastic deformation are required, and the importance of preventive snow melting and ice melting measures on roads is emerging.

Heat transfer wire method and heat pipe method have been applied as anti-icing technologies for heat-related roads developed so far, but various unexpected problems have been derived in terms of construction or maintenance.

The existing anti-icing technology, the heating wire and heat pipe method, generates heat using electricity or other energy sources, and in the event of a system failure, it is difficult to effectively repair and requires re-construction, which causes technical and economic problems.

The heating wire cuts and installs grooves on the asphalt, which is a soft pavement, for areas with high vehicle traffic. Since the heating wire is often broken due to the pressure applied by the wheel of a large vehicle, the actual lifespan is only 2 to 3 years, so it can be used repeatedly. installation is required.

Since the snow removal method starts after the snow has already been loaded, areas that can cause large-scale damage by black ice, such as tunnel entrances or exits, bridges, and large intersections, or road areas with a large floating population or downslope sections, are snow melting at the time of snowfall. It is difficult to secure vehicle traffic due to this.

Patent Document No. 10-1202262, which is a patent document using a heating wire, includes an installation pipe formed as a hollow space under the road pavement and a heating unit including a heating wire provided in the installation pipe; a power supply unit supplying power used for the hot wire; a temperature sensor for measuring the temperature of the road surface; If the measured value of the temperature sensor is less than a predetermined first set value, power is supplied to the hot wire through the power supply unit, and when the measured value of the temperature sensor is greater than a predetermined second set value, power is cut off to the hot wire control unit; There is an unmanned snow removal device for roads including; and a safety light installed on the road pavement and turned on when power is supplied to the heat wire and turned off when power is cut off.

Registered Patent No. 10-2299784 as a patent of the applicant of the present invention is a precast concrete body; A CNT heating module embedded in the precast concrete body and connected to a wire to generate heat through supply of voltage; The precast concrete body includes a protective layer formed to cover the CNT heating module to protect the CNT heating module, and the precast concrete body includes a buried groove into which the CNT heating module and the wire are inserted, The embedding grooves are formed at regular intervals from each other, and connect the embedding portions of the heating module with a width smaller than that of the embedding portion of the heating module between the embedding portion of the heating module in which the CNT heating module is embedded and the embedding portion of neighboring heating modules. and a wire embedment part in which wires are embedded, and the protective layer is made of a packing material or mortar and is formed entirely on the surface of the precast concrete body or filled in the embedment groove to protect the CNT heating module, and the CNT The heating module is inserted into the heating module embedding part and installed together with the wire inserted into the electric wire embedding part, and then embedded through the formation of the protective layer, and receives power through the electric wire to generate heat, thereby generating heat on the surface of the precast concrete body. is maintained at a certain temperature or higher, but includes a filling groove opened toward the outside on the circumference, and after being inserted into the buried groove, the material of the protective layer or a separate filler filled in the buried groove is filled and fixed in the filling groove. It is a precast concrete panel in which the heating module is embedded, and the CNT heating module is made of only CNT, so it gives a sense of difference from the precast concrete body. At this time, even if only the CNT is damaged, there is a disadvantage in that the entire precast concrete panel must be replaced.

Registered Patent No. 10-2299784

The present invention is to solve the problems described above, to prevent the occurrence of black ice on the road on which the vehicle travels through the combination of the heating part and the precast concrete panel, and to make the CNT have the same texture as the precast concrete body. The purpose is to provide a precast concrete panel for black ice prevention road pavement using the MWCNT heating concrete module that extends the life of the road pavement by manufacturing and satisfying both heat generation and pavement.

A precast concrete panel for black ice prevention road pavement using the MWCNT heating concrete module according to the present invention includes a concrete panel body; It includes a heating concrete module formed in a buried type with a surface exposed inside the concrete panel body, and the heating concrete module is made in the form of a hexahedron with a mixture of MWCNTs, water, cement, and sand as a composition, the cement 100 It is characterized in that it consists of a mixture of 45 to 55 parts by weight of water, 240 to 260 parts by weight of sand, and 0.5 to 1 part by weight of MWCNTs having a diameter of 1 nm to 10 nm and a length of 100 nm to 1 cm.

According to the precast concrete panel for black ice prevention road pavement using the MWCNT heating concrete module according to the present invention, the effect of preventing large-scale traffic accidents caused by black ice in winter by using the heat of the road pavement and modularization by factory production It has the effect of minimizing traffic control time through rapid construction, and paving the road with high-strength concrete to extend the life of the road pavement and eventually reducing maintenance costs. In particular, it has the effect of reducing maintenance costs. It has the effect of reducing the maintenance cost of replacing the pavement surface due to damage to the heating part by preventing the dropping phenomenon of the heating part due to the dynamic load of the vehicle.

In addition, it is possible to further improve the black ice prevention effect at a low cost by transferring the heat of the heating concrete module more quickly and widely through the heat transfer means, as well as improving the drop-off prevention effect, and also adjusting the spacing of the neighboring heating concrete modules. By connecting with members and expanding the support base, it can be more safely protected from falling off, and the heating area can be maintained uniformly through the exact installation location of the heating concrete module.

1 is a perspective view of a precast concrete panel for paving black ice prevention road using a MWCNT heating concrete module according to the present invention.
Figure 2 is a plan view of a precast concrete panel for paving black ice prevention road using the MWCNT heating concrete module according to the present invention.
Figures 3 and 4 are examples of heat transfer means applied to the heating concrete module of the precast concrete panel for black ice prevention road pavement using the MWCNT heating concrete module according to the present invention.
Figure 5 is an example of connecting the heating concrete module applied to the precast concrete panel for black ice prevention road pavement using the MWCNT heating concrete module according to the present invention with a spacing adjusting member.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the contents throughout this specification.

As shown in FIGS. 1 and 2, the precast concrete panel 10 for black ice prevention road pavement using the MWCNT heating concrete module according to the present invention includes a precast concrete panel body 11 and a MWCNT heating concrete module (hereinafter referred to as 'heating module') 12.

The concrete panel body 11 is a hexahedron-shaped precast concrete panel manufactured in a factory and transported to a pavement site for pavement construction. It generates heat to prevent black ice.

The concrete panel body 11 has a length of 1,500 mm, a width of 795 mm, a thickness of 50 mm or a length of 6,000 mm, a width of 3,200 mm, and a thickness of 50 mm, but is not limited thereto.

The heating module 12 uses a carbon nanotube (CNT), more preferably a multi-walled carbon nanotube (MWCNT) as a heating material, and also gives a sense of homogeneity to the concrete panel body 11. 45 to 55 parts by weight of water, 240 to 260 parts by weight of sand, and 0.5 to 1 part by weight of MWCNT based on 100 parts by weight of cement. Wealth is made up of

Since cement, water, and sand are the same materials as the concrete panel body 11 and give a sense of homogeneity, the strength of the heating module 12 can be adjusted to a satisfactory level and heat transfer efficiency can be increased.

The average diameter of MWCNTs is 1 nm to 10 nm and the length is 100 nm to 1 cm. The density of MWCNT is 1.33g/cm, the electrical conductivity is 0.17~2ㅧ10 ⁵ S/cm, and the thermal conductivity is 3,000W/mㅇK. MWCNTs have about 100 times better electrical conductivity and 7.5 times better thermal conductivity than copper. MWCNTs are in a functionalized aqueous solution state with a purity of 99%, which is advantageous for securing dispersibility in cement materials.

It was confirmed that MWCNT exhibits optimal heating efficiency when mixed with 0.5 to 1 part by weight based on 100 parts by weight of cement in the above specification.

The heating module 12 has a length of 200 to 500 mm, a width of 80 to 150 mm, a thickness of 50 to 70 mm, preferably 300 mm, a width of 100 mm, and a thickness of 60 mm, and is equipped with an electrode capable of receiving power.

Since the size of the heating module 12 is very small compared to the size of the concrete panel body 11, a plurality of them are applied to one concrete panel body 11, and preferably a width wider than the width of the wheel in the section where the wheel passes. , and at this time, the distance between each other (interval between centers) is 100 ~ 150mm. At this time, the distance between the heating module 12 and the end of the concrete panel body 11 is 1/2 of the distance between the heating modules 12.

The composition, specifications, and spacing of the heating module 12 described above have an organic coupling relationship to create conditions for preventing black ice in a large area of the concrete panel body 11 through minimum cost and optimal heat generation and heat transfer efficiency. There is.

The heating module 12 is manufactured through the same casting as the concrete panel body 11, and the manufacturing method is to manufacture the heating module 12 and the concrete panel body 11 through casting and curing in each formwork, and the concrete panel A prefabricated method of manufacturing by inserting a heating module into the groove of the main body 11, manufacturing the heating module 12 first, fixing it to the formwork of the concrete panel main body 11, and then integrating it through casting and curing of the concrete panel main body 11 On the contrary, there is a pre-embedding method in which the concrete panel body 11 is made to have a groove and the material of the heat generating module 12 is poured using the groove as a pouring space to manufacture the heat generating module.

In the case of the prefabricated method, a process of filling a gap between the heat generating module 12 and the wall of the concrete panel body 11 with mortar or the like is required.

In the case of the pre-embedding method and the post-consolidation method, separate mortar filling is not required, and in the case of the pre-embedding method, it is possible to freely transform and apply the shape of the heating module 12, for example, as shown in FIG. 3, heat generation It may include a heat transfer rod 13 that protrudes to the outside of the module 12 and transfers heat to the reinforcing bar 14 of the concrete panel body 11.

The heat transfer rod 13 penetrates the inside of the heat generating module 12 while protruding from both sides in the longitudinal direction to the outside of the heat generating module 12 and is fixed in contact with the reinforcing bar 14 to enable heat transfer.

In addition, as another example of the heat transfer means, a heat transfer frame 15 (see FIG. 4) having radial (cross-shaped) heat transfer units 15a while covering and protecting the circumference of the heating module 12 is also possible. The heat transfer frame 15 is formed in the shape of a box with an open top and can also function as a formwork for placing the heating module 12, that is, it is used from manufacturing to construction of the heating module 12.

The heat transfer frame 15 is integrally synthesized with the heat generating module 12 placed therein and includes studs (protrusions) on the inner wall to prevent the heat generating module 12 from falling off.

The heat transfer frame 15 includes one or more holes 15b in the heat transfer portion 15a. The hole 15b is used as a hole in which the concrete of the concrete panel body 11 is filled, and is very useful in preventing falling off.

Since the heat transfer means having such a configuration can transfer the heat of the heating module 12 to the surroundings more efficiently, it is possible to derive a black ice prevention effect even when using a small quantity or small size of the heating module 12, and also , Even if a dynamic load is transferred from the vehicle through the connection with the reinforcing bar 14 of the concrete panel body 11, it is possible to eliminate the risk of falling off.

In addition, according to the box-shaped heat transfer frame 15, the pouring space of the heating module 12 is separated from the pouring space of the concrete panel body 11, so that the heating module 12 and the concrete panel body 11 are simultaneously poured. and thus shorten the production period.

In addition, when using the heat transfer frame 15, two adjacent heat transfer frames 15 are connected with a spacing adjusting member 16 (see FIG. 6) to maintain a constant distance between neighboring heating modules 12 and mutually Through the support of the liver, it can be configured to provide greater help in preventing dropout.

The spacing adjusting member 16 is in the form of a turn button capable of adjusting the length, and both bolts formed with threads in opposite directions are screwed (or welded) to the nut part formed on the adjacent heat transfer frame 15, and the gap between the bolts is The gap is adjusted by manipulating the nut to move the heat transfer frame 15 in a direction closer or farther away.

The black ice prevention road pavement method using the precast concrete panel for black ice prevention road pavement using the MWCNT heating concrete module according to the present invention is as follows.

1. Clearing the pavement.

After removing the existing pavement (eg asphalt pavement), prepare the face of the removed pavement section.

2. Installation of integrated precast concrete panels for heating part.

After lifting the panel 10 and transporting it over the pavement section, it is mounted on the pavement surface.

The leveling of the panel 10 is aligned and interlocked with the neighboring panel 10 .

3. Grouting.

After sealing the edge of the panel 10, grouting is performed between the bottom of the panel 10 and the pavement surface through the grouting hole of the panel 10.

4. Connection of heating module and controller.

A controller and a power supply unit are installed next to the pavement area where the panel 10 is installed, and the controller is connected to the voltage of the heating module 12 and connected to a wire wired to the panel 10.

Through the above process, the application and packaging by the panel 10 is completed.

According to the road pavement constructed through the above process, when a voltage (eg, 30 to 60 V) is applied to the heating module 12 in meteorological conditions in which black ice is generated on the road surface, the heating unit 12 generates heat ( eg 25° C.). The on/off control of the heating module 12 can be automatically controlled or manually controlled. In the case of automatic control, the external temperature of the area where the panel 10 is installed is detected through a temperature sensor, and the current temperature is determined by comparing the temperature detected by the temperature sensor with the reference temperature (a temperature range in which black ice may occur). When the current temperature is lower than the reference temperature, the heating module 12 is controlled to be turned on, and conversely, when the current temperature is higher than the reference temperature, the heating module 12 is controlled to be turned off.

The heat of the heat generating module 12 is transferred to the surface of the concrete panel body 11 to form the surface of the panel 10 and the crack formed from the surface to a temperature higher than the temperature at which black ice is generated.

Therefore, even if water or snow permeates into a small gap from the surface of the panel 10, it does not freeze.

In addition, the present invention can melt already frozen ice through the heat of the heating module 12 as well as preventing black ice.

At this time, the heat of the heating module 12 is transferred to the reinforcing bars 14 of the concrete panel body 11 through the heat transfer means 13 or 15, and quickly transfers high-temperature heat to a place far from the heating module 12. .

As a result, the road paved by the panel 10 of the present invention prevents accidents due to black ice.

10: precast concrete panel,
11: concrete panel body, 12: heating module
13: electric heating rod, 14: rebar
15: heat transfer frame,

Claims (3)

a concrete panel body 11;
A heating concrete module 12 formed in a buried type whose surface is exposed inside the concrete panel body;
Including a heat transfer means for transferring the heat of the heating concrete module to the reinforcing bars of the concrete panel body,
The exothermic concrete module is made of a mixture of 45 to 55 parts by weight of water, 240 to 260 parts by weight of sand, and 0.5 to 1 part by weight of MWCNT having a diameter of 1 nm to 10 nm and a length of 100 nm to 1 cm based on 100 parts by weight of cement, and has a length of 200 to 500 mm and a width of 200 to 500 mm. 80~150mm, thickness 50~70mm,
The heat transfer means is a heat transfer rod 13 that penetrates the inside of the heating concrete module and is fixed in contact so that both sides in the longitudinal direction protrude out of the heating concrete module 12 to enable heat transfer to the reinforcing bar 14. Precast concrete panels for road paving to prevent black ice using MWCNT heating concrete modules. delete a concrete panel body 11;
A heating concrete module 12 formed in a buried type whose surface is exposed inside the concrete panel body;
Including a heat transfer means for transferring the heat of the heating concrete module to the concrete panel body,
The exothermic concrete module is made of a mixture of 45 to 55 parts by weight of water, 240 to 260 parts by weight of sand, and 0.5 to 1 part by weight of MWCNT having a diameter of 1 nm to 10 nm and a length of 100 nm to 1 cm based on 100 parts by weight of cement, and has a length of 200 to 500 mm and a width of 200 to 500 mm. 80~150mm, thickness 50~70mm,
The heat transfer means is formed in the form of a box with an open top, and is formed on the heat transfer frame 15 in which the heat-generating concrete module is placed, and is formed on the circumference of the heat transfer frame and transmits the heat of the heat-generating concrete module to the concrete panel body. Black ice prevention using the MWCNT heating concrete module, characterized in that it is composed of a radial heat transfer unit (15a) and a spacing control member (16) connected to the neighboring heat transfer frame (15) to maintain a distance between the heating concrete modules. Precast concrete panels for road paving.

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