Thermoelectric crack-resistant base fabric, thermoelectric cooling crack-resistant pavement and paving method

Abstract

The invention discloses a thermoelectric crack-resistant base fabric, a thermoelectric cooling crack-resistant pavement and a laying method, comprising a thermoelectric crack-resistant base fabric, which is laid on a semi-rigid base layer, and an asphalt mixture surface layer is laid on the top of the thermoelectric crack-resistant base fabric; the thermoelectric crack-resistant base fabric comprises a thermoelectric power generation device, a plurality of thermoelectric power generation devices are embedded in a heat insulation layer in a row, and the hot ends of the thermoelectric power generation devices are placed at the upper end, geotextiles are arranged at the top and bottom of the heat insulation layer, a plurality of thermoelectric power generation devices in the same row are connected in series to form a series unit, and a plurality of series units are connected in parallel. The invention combines the thermoelectric power generation technology with road engineering materials and effectively utilizes them in road engineering. The pavement structure is easy to construct, and can efficiently utilize the temperature difference inside the pavement structure to convert heat energy into electrical energy, thereby effectively alleviating the "heat island effect", improving the high temperature stability of the asphalt pavement, and at the same time inhibiting the reflective cracks of the base layer, extending the service life of the pavement, and generating electricity through the road, effectively alleviating the problem of resource shortage.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering pavement paving, and in particular to a temperature difference power generation crack-resistant base fabric, a temperature difference power generation cooling crack-resistant pavement and a paving method. Background Art

[0002] Energy is a key factor driving the human economy and improving the quality of life. As traditional fossil fuels are becoming increasingly scarce and the environmental pollution they cause is becoming more prominent, the development and utilization of green energy has received attention from the entire society. Asphalt pavement is widely used in highways, urban roads, bridge decks, airport pavements, etc. due to its advantages such as smooth surface, comfortable driving, good wear resistance, low vibration, and low noise. Asphalt pavement is a black pavement, similar to a black body, with an absorption coefficient of solar radiation as high as 0.8 to 0.95. It is a strong heat absorber / exotherm and can absorb and remove a large amount of heat. Especially in the hot summer season, the surface temperature of the asphalt pavement during the day can reach 60°C or even higher. The large amount of accumulated heat exacerbates the "heat island effect". At the same time, the road surface is prone to rutting, shifting, congestion, oiling, and other diseases under continuous high temperatures, which accelerates the aging of the asphalt pavement and reduces the service life of the pavement. How to collect and utilize the large amount of heat energy in the huge area of ​​asphalt pavement can first reduce the road surface temperature, weaken the adverse impact of urban roads on the "heat island effect", reduce high-temperature diseases, and extend the service life of the road surface; at the same time, it can efficiently utilize solar energy, alleviate resource shortages, and promote the greening and intelligence of roads, which can create huge economic and social benefits.

[0003] Thermoelectric power generation technology is a power generation technology that converts thermal energy into electrical energy. It has the characteristics of low cost, small size, no pollution, no motion characteristics and long operating life. It is a power generation method that utilizes natural energy through temperature difference. This technology can be applied in a reasonable way to pavement structures that are rich in thermal energy and naturally have temperature differences, so as to achieve effective utilization of natural energy and improve the temperature conditions of pavement structures. At present, thermoelectric power generation technology is rarely used in asphalt pavements. The existing patent sets different material parameters for asphalt concrete, which is a pavement structure in which P-type and N-type thermoelectric concrete are spaced apart in the cross-sectional direction of the pavement. The thermal circuit pavement has good power generation efficiency, but the pavement is difficult to pave. The existing patent also leads the pavement temperature to one side of the shoulder and realizes energy conversion and collection at the shoulder, but the design has a relatively low utilization rate of heat. Summary of the invention

[0004] The present invention provides a thermoelectric crack-resistant base fabric, a thermoelectric cooling crack-resistant pavement and a paving method. The pavement structure is easy to construct, has a high thermal energy utilization rate and a high thermoelectric conversion efficiency, and can effectively solve the problem of energy collection inside the pavement, thereby effectively reducing the temperature amplitude of the pavement, alleviating pavement temperature diseases, extending the service life of the pavement, and alleviating the "heat island effect".

[0005] The present invention is achieved through the following technical solutions:

[0006] A temperature difference power generation crack-resistant base fabric, comprising a heat insulation layer, a temperature difference power generation device and a geotextile layer;

[0007] A plurality of thermoelectric power generation devices are embedded in the insulation layer in an array, and the hot end of the thermoelectric power generation device is placed at the upper end, and geotextiles are arranged at the bottom of the insulation layer, or at the top and the bottom. Multiple thermoelectric power generation devices in the same row are connected in series to form a series unit, and multiple series units are connected in parallel.

[0008] Preferably, the geotextile is bonded to the insulation layer via an adhesive layer.

[0009] Preferably, the thermal insulation layer is a hollow spherical shell filled with epoxy resin-based composite material.

[0010] Preferably, the temperature difference power generation device is a temperature difference power generation sheet.

[0011] Preferably, the geotextile is a thermally conductive enhanced polypropylene geotextile.

[0012] A temperature difference power generation cooling and crack resistance pavement comprises a temperature difference power generation crack resistance base fabric, the temperature difference power generation crack resistance base fabric is laid on a semi-rigid base layer, and an asphalt mixture surface layer is laid on the top of the temperature difference power generation crack resistance base fabric.

[0013] Preferably, both sides of the temperature difference generating crack resisting base fabric are also paved with heat conductive adhesive layers, and a transparent layer is paved between the semi-rigid base layer and the heat conductive adhesive layer.

[0014] Preferably, the asphalt mixture surface layer includes an upper layer, a middle layer and a lower layer from top to bottom, the upper layer is ordinary asphalt concrete, and the lower layer and the middle layer are thermal conductive asphalt concrete.

[0015] A method for paving a road surface by using temperature difference power generation to cool down and prevent cracking, comprising the following steps:

[0016] Sprinkle the permeable layer on the formed semi-rigid base layer, with the amount of permeable layer being 0.9-1kg / m;

[0017] 12 to 24 hours after the permeable layer is sprayed, a thermal conductive adhesive layer is sprayed on the surface, the thickness of the thermal conductive adhesive layer is 2 to 3 mm, and the spraying temperature is 165 to 180°C;

[0018] Laying the temperature difference crack-causing base fabric on the heat conductive adhesive layer;

[0019] Spreading a heat-conducting adhesive layer on the temperature difference crack-generating base fabric;

[0020] An asphalt mixture surface layer is laid on the thermal conductive adhesive layer.

[0021] Preferably, the paving of the temperature difference induced cracking base fabric is carried out simultaneously with the spreading of the thermal conductive adhesive layer on the upper surface of the permeable layer, the operation interval between the temperature difference induced cracking base fabric and the thermal conductive adhesive layer is controlled within meters, the temperature difference induced cracking base fabric is statically pressed 1 to 2 times after laying, and the rolling operation and the paving operation of the temperature difference induced cracking base fabric are within 5 meters.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] The invention provides a thermoelectric crack-resistant base fabric, wherein the combined layer of the thermal insulation material and the thermoelectric power generation device has good thermal insulation performance, and the geotextile and the adhesive of the outer layer have good thermal conductivity. This combination concentrates the temperature difference distributed in the thermoelectric crack-resistant base fabric to the combined layer of the thermal insulation material and the thermoelectric power generation device, effectively utilizing the temperature difference to the greatest extent, and having a high thermoelectric conversion efficiency. The thermoelectric crack-resistant base fabric is an integral and rollable one, which is easy to transport and construct, and has good tensile strength, and can be used as a mechanical reinforcement layer of the applied structure.

[0024] The present invention provides a temperature difference power generation and cooling crack resistance pavement. A temperature difference power generation crack resistance base fabric is arranged between a semi-rigid base layer and an asphalt surface layer, so as to realize the utilization of the temperature difference inside the pavement structure of the entire road width and convert it into electrical energy. The temperature difference power generation crack resistance base fabric adopts a low thermal conductivity geotechnical material to ensure that a large temperature difference is formed between the upper and lower surfaces of the temperature difference power generation crack resistance base fabric. A thermal conductive adhesive layer is arranged on the upper and lower surfaces of the temperature difference power generation crack resistance base fabric, so as to improve the bonding effect between the temperature difference power generation crack resistance base fabric and the semi-rigid base layer and the asphalt surface layer, thereby improving the durability of the structure of the present invention. At the same time, the thermal conductivity of the thermal conductive adhesive layer is high. It can well realize the lateral distribution of the upper and lower surface temperatures of the thermoelectric crack-resistant base fabric, improve the energy utilization efficiency, and the middle and lower layers of thermal conductive asphalt concrete can increase or decrease the surface temperature of the base fabric, increase the temperature difference between the upper and lower surfaces of the base fabric, and improve the power generation efficiency; the thermoelectric crack-resistant base fabric buries the thermoelectric power generation device in the geotextile, effectively avoiding the cumbersome process of burying and arranging the thermoelectric power generation device alone in the road surface, and the construction is simple and fast; the thermoelectric crack-resistant base fabric has good mechanical properties, can effectively prevent and control the reflective cracks of the base layer, and reduce the occurrence of road diseases. It can be seen that the present invention combines thermoelectric power generation technology with road engineering materials and effectively utilizes them in road engineering, and efficiently utilizes the internal temperature difference of the road surface structure to convert heat energy into electrical energy, thereby effectively alleviating the "heat island effect", improving the high temperature stability of the asphalt pavement, and at the same time inhibiting the reflective cracks of the base layer, extending the service life of the road surface, and generating electricity through the road, effectively alleviating the problem of resource shortage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of a temperature difference crack-resistant base fabric of the present invention;

[0026] Figure 2A top view of a temperature difference crack-resistant base fabric of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the temperature difference power generation cooling and crack prevention road surface of the present invention.

[0028] In the figure: 1-insulating material, 2-temperature difference power generation device, 3-geotextile, 4-adhesive, 5-conducting wire, 6-semi-rigid base layer, 7-permeable layer, 8-thermal conductive adhesive layer, 9-temperature difference power generation crack-resistant base fabric, 10-lower layer, 11-middle surface layer, 12-upper layer. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are intended to explain the present invention rather than to limit it.

[0030] refer to Figure 1 and 2 A temperature difference power generation crack-resistant base fabric comprises a heat insulation layer 1, a temperature difference power generation device 2, a geotextile layer 3, a bonding layer 4 and a conductor 5.

[0031] A plurality of thermoelectric power generation devices 2 are embedded in the insulation layer 1 in an array, and the hot end of the thermoelectric power generation device 2 is placed at the upper end. Geotextiles 3 are arranged on the top and bottom of the insulation layer 1, and the geotextiles 3 are bonded to the insulation layer 1 through an adhesive layer. A plurality of thermoelectric power generation devices 2 in the same column are connected in series through wires to form a series unit, and a plurality of series units are connected in parallel. The number of thermoelectric power generation devices 2 in the series unit and the number of series units in the parallel structure are determined in combination with the actual application scenario and the principle of maximizing power generation.

[0032] The heat insulating layer 1 is a rollable heat insulating sheet, specifically a hollow spherical shell filled with epoxy resin-based composite material, with a thickness of 5 to 10 mm.

[0033] The temperature difference power generation device 2 is embedded in the thermal insulation material 1, and its thickness is the same as or slightly thinner than the thermal insulation material. The temperature difference power generation device can be specifically a temperature difference power generation sheet.

[0034] The geotextile 3 is a heat-conducting enhanced polypropylene geotextile, specifically a carbon fiber aluminum powder reinforced polypropylene geotextile, with a thickness of 0.5 to 1.5 mm.

[0035] The adhesive 4 is a thermally conductive epoxy resin adhesive, and specifically may be an alumina-modified epoxy resin.

[0036] The conductor 5 is a high temperature resistant conductor, and specifically can be a silicone rubber braided high temperature wire.

[0037] refer to Figure 3 A temperature difference power generation and cooling crack resistance pavement comprises a semi-rigid base layer 6, a permeable layer 7, a thermal conductive bonding layer 8, a temperature difference power generation and crack resistance base fabric 9, a thermal conductive bonding layer 8 and an asphalt mixture surface layer which are arranged in sequence from bottom to top.

[0038] The permeable layer 7 is high-permeability emulsified asphalt or kerosene-diluted asphalt.

[0039] The thermally conductive adhesive layer 8 is polymer-modified emulsified asphalt with added thermally conductive material. The polymer-modified emulsified asphalt with added thermally conductive material can specifically be graphene epoxy modified asphalt or alumina SBS modified asphalt. The thermally conductive adhesive layer 8 has a thickness of 2 to 3 mm.

[0040] The asphalt mixture surface layer includes an upper layer 12, a middle layer 11 and a lower layer 10 from top to bottom.

[0041] The upper layer 12 is ordinary asphalt concrete, and the lower layer 10 and the middle layer 11 are heat-conducting asphalt concrete. The heat-conducting asphalt concrete can specifically be graphite / carbon fiber heat-conducting asphalt concrete.

[0042] The temperature difference power generation cooling and crack-resisting road surface is used in conjunction with an energy storage device, and the generated electrical energy is input into the energy storage device for storage and utilization.

[0043] The paving process of the above-mentioned temperature difference power generation cooling and crack prevention road surface is as follows:

[0044] The permeable layer 7 is spread on the semi-rigid base layer 6 formed by rolling. Before the construction of the permeable layer 7, the top surface of the semi-rigid base layer 6 needs to be cleaned thoroughly to keep the top surface of the base layer clean. The spreading amount of the permeable layer 7 is 0.9-1kg / m3.

[0045] 12 to 24 hours after the permeable layer 7 is spread, the thermal conductive adhesive layer 8 is further arranged on the permeable layer 7. The thermal conductive adhesive layer 8 has a thickness of 2 to 3 mm, a spreading temperature of 165 to 180° C., and a spreading width that is 4 to 6 cm wider than both sides of the temperature difference crack-causing base fabric.

[0046] A temperature difference induced crack resisting base fabric is laid on the thermal conductive adhesive layer 8. The spreading of the temperature difference induced crack resisting base fabric is carried out simultaneously with the spreading of the thermal conductive adhesive layer 8 on the transparent layer 7. The interval between the two operations is controlled within 10 meters. After the laying of the temperature difference induced crack resisting base fabric, it is followed by static compaction with a rubber-wheel roller for 1 to 2 times. The rolling operation and the spreading of the temperature difference induced crack resisting base fabric are within 5 meters.

[0047] A heat-conducting adhesive layer 8 is spread on the thermoelectric crack-resistant base fabric. The size of the heat-conducting adhesive layer 8 on the surface of the thermoelectric crack-resistant base fabric is the same as that of the thermoelectric crack-resistant base fabric. The thickness of the heat-conducting adhesive layer 8 is 2 to 3 mm.

[0048] On the thermal conductive adhesive layer 8, a mixture lower layer 10, a middle layer 11 and an upper layer 12 are sequentially paved according to conventional asphalt pavement surface construction specifications.

[0049] The specific working process of the present invention is:

[0050] The upper layer 12 directly absorbs external heat and transfers it to the inside of the pavement structure, thereby forming a temperature gradient in the thermoelectric generator base fabric, so that the thermoelectric generator 2 can work to generate electric charge, and the charge transmission can be realized through the supporting circuit 5. In actual application, it needs to be used in conjunction with a collection and storage device to ultimately realize electric energy storage.

[0051] Example 1

[0052] A thermoelectric crack-resistant base fabric comprises, from bottom to top, a geotextile 3, a binder 4, an insulating layer 1 and a combination layer of a thermoelectric power generation device 2, wherein the hot end of the thermoelectric power generation device 2 is placed on the upper side; the thermoelectric power generation device 2 forms a connection structure in which a plurality of thermoelectric power generation devices 2 are connected in series through a conductor 5 to form a series unit, and then the plurality of series units are connected in parallel, the number of the thermoelectric power generation devices 2 in the series unit is 25 and the number of the series units in the parallel structure is 50.

[0053] The insulation layer 1 is a hollow spherical shell filled with epoxy resin-based composite material with a thickness of 8 mm; the temperature difference power generation device 2 is embedded in the insulation material 1, and its thickness is the same as that of the insulation layer 1, and the temperature difference power generation device 2 is a temperature difference power generation sheet; the geotextile 3 is a carbon fiber aluminum powder reinforced polypropylene geotextile with a thickness of 0.8 mm; the adhesive 4 is alumina modified epoxy resin; the supporting circuit 5 is a silicone rubber braided high-temperature wire.

[0054] In the paving process of the temperature difference power generation cooling and crack resistance road surface, the permeable layer 7 is kerosene diluted asphalt. Before the construction of the permeable layer 7, the top surface of the semi-rigid base layer 6 is thoroughly cleaned, and the spreading amount of the permeable layer 7 is 1kg / m3; 18 hours after the permeable layer 7 is spread, the thermal conductive adhesive layer 8 is further arranged on the permeable layer 7. The thermal conductive adhesive layer 8 is alumina SBS modified asphalt with a thickness of 3mm, a spreading temperature of 170°C, and a spreading width wider than 5cm on both sides of the temperature difference power generation crack resistance base cloth; a temperature difference power generation crack resistance base cloth is further laid on the thermal conductive adhesive layer 8, and the upper side of the temperature difference power generation crack resistance base cloth matches the road surface structure from bottom to top, and the paving of the temperature difference power generation crack resistance base cloth is the same as the spreading of the thermal conductive adhesive layer 8 on the permeable layer 7. The steps are carried out, and the interval between the two operations is controlled within 10 meters. After the temperature difference induced crack-resistant base cloth is laid, it is followed by static pressing with a rubber-wheel roller for 2 times, and the rolling operation and the paving operation of the temperature difference induced crack-resistant base cloth are 5 meters apart; further, a thermal conductive adhesive layer 8 is sprinkled on the temperature difference induced crack-resistant base cloth, and the thickness of the thermal conductive adhesive layer 8 is 3mm; further, a thermal conductive adhesive layer 8 is sprinkled on the crack-resistant base cloth. Conventional asphalt pavement surface layer construction specifications are used to sequentially pave the mixture lower layer 10, middle layer 11, and upper layer 12, and the lower layer, middle layer, and upper layer are AC-25 graphite / carbon fiber thermal conductive asphalt concrete, AC-20 graphite / carbon fiber thermal conductive asphalt concrete, and ordinary AC-13 asphalt mixture.

[0055] Performance Test:

[0056] In order to verify the performance of the above embodiment, indoor test specimens were prepared according to the above temperature difference power generation cooling and crack prevention pavement structure and material composition, and ordinary asphalt mixture control specimens were formed at the same time, and depth direction temperature field and power generation voltage tests were carried out.

[0057] Temperature field test in depth direction: a temperature sensor is embedded in the formed specimen. The temperature sensor of the experimental group is embedded in the top of the interlayer. The buried position of the control group is the same as that of the experimental group. The bottom and sides of the specimen are wrapped with insulation material and buried in the ground. The surface of the specimen is flush with the ground. At the same time, the temperature field of the experimental group and the control group specimens and the power generation voltage of the experimental group are observed and recorded in real time within one day. The results are shown in Table 1 and Table 2. It can be seen from Table 1 that the temperature difference power generation cooling crack resistance pavement can significantly reduce the road surface temperature. The temperature difference between the upper and lower sides of the temperature difference power generation crack resistance base cloth is 15°C. Combined with Table 2, an objective power generation voltage can be generated.

[0058] Table 1

[0059]

[0060] Table 2

[0061] Maximum power generation voltage 2.02

[0062] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A temperature difference power generation cooling and crack prevention road surface, characterized in that: It comprises a temperature difference crack generating base fabric (9), the temperature difference crack generating base fabric (9) is laid on a semi-rigid base layer (6), and an asphalt mixture surface layer is laid on the top of the temperature difference crack generating base fabric (9); The thermoelectric generator crack-resistant base fabric comprises a heat insulating layer (1), a thermoelectric generator device (2) and a geotextile (3); A plurality of temperature difference power generation devices (2) are embedded in an insulation layer (1) in an array, and the hot end of the temperature difference power generation device (2) is placed at the upper end, and a geotextile (3) is arranged at the bottom, or at the top and the bottom, of the insulation layer (1). A plurality of temperature difference power generation devices (2) in the same row are connected in series to form a series unit, and a plurality of series units are connected in parallel; The thermal insulation layer (1) is a hollow spherical shell filled with epoxy resin-based composite material; Thermally conductive adhesive layers (8) are also laid on both sides of the temperature difference crack-generating base fabric (9), and a transparent layer (7) is laid between the semi-rigid base layer (6) and the thermally conductive adhesive layer (8); The asphalt mixture surface layer comprises, from top to bottom, an upper layer (12), a middle layer (11) and a lower layer (10), the upper layer (12) being ordinary asphalt concrete, and the lower layer (10) and the middle layer (11) being heat-conducting asphalt concrete.

2. A thermoelectric power generation cooling and crack-resisting pavement according to claim 1, characterized in that: The geotextile (3) is bonded to the thermal insulation layer (1) via an adhesive layer (4).

3. The thermoelectric power generation cooling and crack-resisting pavement according to claim 1, characterized in that: The temperature difference power generation device (2) is a temperature difference power generation sheet.

4. The thermoelectric power generation cooling and crack-resisting pavement according to claim 1, characterized in that: The geotextile (3) is a thermally conductive enhanced polypropylene geotextile.

5. A method for laying a temperature difference power generation cooling and crack-resisting road surface according to any one of claims 1 to 4, characterized in that: The process includes: Sprinkle the permeable layer (7) on the formed semi-rigid base (6), and the spreading amount of the permeable layer (7) is 0.9~1kg / m 3 ; 12 to 24 hours after the permeable layer (7) is spread, a thermally conductive adhesive layer (8) is spread on the surface thereof, wherein the thermally conductive adhesive layer (8) has a thickness of 2 to 3 mm and a spreading temperature of 165 to 180° C.; Laying a temperature difference crack-causing base fabric on the heat conductive adhesive layer (8); Spreading a heat-conducting adhesive layer on the temperature difference crack-generating base fabric; An asphalt mixture surface layer is laid on the heat-conductive adhesive layer (8).

6. The method for laying a temperature difference power generation cooling and crack-resisting road surface according to claim 5 is characterized in that: The paving of the thermoelectric crack-generating base fabric is carried out simultaneously with the spreading of the heat-conducting adhesive layer (8) on the upper surface of the permeable layer (7). The operation interval between the thermoelectric crack-generating base fabric and the heat-conducting adhesive layer (8) is controlled within 10 meters. After the thermoelectric crack-generating base fabric is laid, static pressing is performed 1 to 2 times. The rolling operation and the paving operation of the thermoelectric crack-generating base fabric are within 5 meters.

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