Induction heating remodeling self-healing asphalt potting glue and preparation method thereof

Abstract

The invention discloses an induction heating remodeling self-healing asphalt potting glue, which is characterized in that it comprises matrix asphalt, desulfurized rubber powder and induction heating material, wherein, according to the percentage of the total amount of components, the matrix asphalt accounts for 50% to 70%, the desulfurized rubber powder accounts for 20% to 40% and the induction heating material accounts for 10% to 20%; the induction heating material comprises one or more combinations of iron powder, nickel-zinc ferrite powder, manganese-zinc ferrite powder, steel slag powder and steel sand powder; the matrix asphalt has a softening point of 40-50°C; the asphalt potting glue can realize induction heating self-healing, and its strength recovery rate after multiple self-healing can reach 75%, has a long service life and good self-healing performance, and is suitable for promotion.

Description

Technical Field

[0001] The invention belongs to the field of highway asphalt pavement, and more specifically, relates to an induction heating resilient self-healing asphalt potting glue and a preparation method thereof. Background Art

[0002] Under the coupling of factors such as vehicle load, changes in external conditions, and reflective cracking of the base layer, in-service asphalt concrete pavements will develop various forms of cracking as their service life increases. If not treated in time, once surface water seeps into the road surface, it will cause structural damage to the pavement and significantly reduce its service life.

[0003] At present, potting maintenance is the most cost-effective way to deal with road cracks. The material used for asphalt pavement potting is called potting glue or sealant. The potting glue usually uses modified asphalt polymer materials, which have self-healing ability and can restore the elasticity of the road surface. Asphalt pavement potting has very high requirements for material quality and process. It requires the potting glue to have strong bonding ability with the crack wall of asphalt concrete, to be able to completely seal the crack, and not to lose at high temperature and not to crack at low temperature. However, most of the existing potting glues are easily squeezed out of the cracks by vehicle tires under high temperature conditions due to the low softening point of asphalt, and thus taken away by vehicle tires. Under low temperature conditions, it is easy to crack at the interface with the crack wall, and it needs to be re-potted after the crack is opened, and the service life is short. Under normal circumstances, the service life of ordinary potting glue is 2 to 3 years, and its self-healing ability is limited. In order to increase the service life of potting glue, it is generally tried to improve the self-healing ability of potting glue. For example, Chinese invention patent CN106947416A uses a modifier, aromatic oil, fluorocarbon surfactant, hydrotalcite, mixed antioxidant, plasticizer and aramid fiber to prepare a self-healing high-permeability potting glue with a self-healing rate of 68%.

[0004] Although potting glue has a certain self-healing ability, after using potting glue, the integrity of the road surface at the crack cannot be fully restored, and it is very likely to be damaged again. It is difficult to achieve multiple healing after cracking again, resulting in a shorter overall service life of the road surface. In particular, in order to improve the self-healing ability of potting glue, it is generally necessary to improve the fluidity of potting glue, which makes the potting glue easy to soften and flow at high temperatures. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an induction heating resilient self-healing asphalt potting glue and a preparation method thereof, the purpose of which is to add an appropriate amount of induction heating material to a base asphalt with a softening point of 40-50°C, wherein the induction heating material accounts for 10-20% of the total component amount, and has the functions of induction heating the asphalt and improving the softening point of the potting glue, thereby solving the technical problems of the existing potting glue being easy to lose at high temperature and / or difficult to achieve multiple self-healing and having a short service life.

[0006] To achieve the above-mentioned object, according to one aspect of the present invention, an induction heating resilient self-healing asphalt potting glue is provided, which comprises base asphalt, desulfurized rubber powder and induction heating material, wherein the base asphalt accounts for 50% to 70%, the desulfurized rubber powder accounts for 20% to 40% and the induction heating material accounts for 10% to 20% according to the percentage of the total amount of components;

[0007] The induction heating material comprises one or more combinations of iron powder, nickel-zinc ferrite powder, manganese-zinc ferrite powder, steel slag powder and steel sand powder;

[0008] The base asphalt has a softening point of 40-50°C.

[0009] Preferably, the induction heating remodeling self-healing asphalt potting glue has an asphalt softening point of 45-50°C, and the induction heating material accounts for 10%-15%. The induction heating material includes one or more combinations of iron powder, nickel-zinc ferrite powder or manganese-zinc ferrite powder; the asphalt softening point is 40-45°C, and the induction heating material accounts for 15%-20%. The induction heating material includes one or more combinations of steel slag powder and / or steel sand powder.

[0010] Preferably, the induction heating remodeled self-healing asphalt potting glue comprises, by weight, 50-60 parts of matrix asphalt, 30-40 parts of desulfurized rubber powder and 10-15 parts of induction heating material, wherein the induction heating material is one or more combinations of iron powder, nickel-zinc ferrite powder or manganese-zinc ferrite powder;

[0011] Calculated by weight, the base asphalt is 60-70 parts, the desulfurized rubber powder is 20-30 parts and the induction heating material is 15-20 parts, and the induction heating material is steel slag powder and / or steel sand powder.

[0012] Preferably, the induction heating material of the induction heating self-healing asphalt potting glue has a particle size of less than 0.075 mm.

[0013] Preferably, the desulfurized rubber powder in the induction heating remodeling self-healing asphalt potting glue has a particle size of 30-50 mesh, a relative density of 1.10-1.30 g / cm3, and a water content of less than 1%.

[0014] According to another aspect of the present invention, a method for preparing the induction heating remodeling self-healing asphalt potting glue is also provided, which comprises the following steps:

[0015] The base asphalt is heated and softened to a flowable state, the desulfurized rubber powder is added according to a preset ratio, and high-speed shearing is performed at a preset temperature until the rubber powder is fully swollen and evenly dispersed in the asphalt to obtain a rubber-modified asphalt binder;

[0016] After obtaining the rubber modified asphalt binder, keep the high-speed shear and temperature unchanged, add the induction heating material according to the preset addition amount, and stir at a low speed until the induction heating material is evenly dispersed in the rubber modified asphalt, so as to obtain the asphalt potting glue that can be self-healed by induction heating.

[0017] Preferably, in the preparation method of the induction heating remodelable self-healing asphalt potting glue, calculated as a percentage of the total components, when the induction heating material is one or more combinations of iron powder, nickel-zinc ferrite powder or manganese-zinc ferrite powder, 10%-15% is added; when it is one or more combinations of steel slag powder and / or steel sand powder, 15%-20% is added.

[0018] Preferably, in the method for preparing the induction heating remodeling self-healing asphalt potting glue, the preset proportions, calculated by weight, are 50-70 parts of base asphalt and 20-40 parts of desulfurized rubber powder; and the preset temperature is 190-210°C.

[0019] Preferably, in the method for preparing the induction heating remodeling self-healing asphalt potting glue, the low-speed stirring is stirring at a speed of 400-600 rpm for 20-40 min, and the stirring temperature is 180-200°C.

[0020] Preferably, in the method for preparing the induction heating remodeling self-healing asphalt potting glue, the high-speed shearing is high-speed stirring for 45-120 min at a rotation speed of 3000-5000 rpm and a stirring temperature of 190-210°C.

[0021] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0022] Since induction heating materials are added to the base asphalt with a softening point of 40-50°C, 10%-20% of the induction heating materials are added to the total amount of the mixture. After adding the induction heating materials, firstly, the potting glue can flow during induction heating to achieve self-healing and the strength recovery rate is significantly improved after multiple self-healing. Secondly, after adding the induction heating materials, its softening point is higher than that of conventional asphalt potting glue, which can avoid high-temperature loss and is especially suitable for repairing cracks in asphalt pavement that is in a high-temperature environment for a long time. In addition, adding 20-40% of desulfurized rubber powder increases the amount of desulfurized rubber powder added compared to conventional asphalt potting glue, and has better elastic recovery ability.

[0023] In particular, when the asphalt softening point is 45-50°C, that is, when the fluidity is relatively low, adding 10%-15% of one or more combinations of iron powder, nickel-zinc ferrite powder or manganese-zinc ferrite powder, this induction heating material with higher magnetic permeability has a better heating effect even if added in small amounts, and can reduce the influence of the heat-induced material itself on the fluidity of the asphalt potting glue, and is also beneficial to control costs; and when the asphalt softening point is 40-45°C, that is, when the fluidity is relatively high, adding 15%-20% of one or more combinations of steel slag powder and / or steel sand powder, this induction heating material with lower magnetic permeability has a better heating effect when added in higher amounts, and has less influence on the fluidity of the asphalt potting glue within this addition range, and is also beneficial to avoid high-temperature loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the asphalt sealing glue performance test process. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] When ordinary potting glue (base asphalt or modified asphalt) is used to repair road cracks, due to the low softening point of asphalt, it is easy to soften under high temperature conditions and be squeezed out by the wheels. Moreover, if cracks appear on the road surface again after potting repair, the cracks need to be opened and re-potted. The service life of the potting glue is short, and the elastic recovery ability of ordinary potting glue is poor. The existing self-healing potting glue, by adding aramid fiber, has a certain self-healing effect, but it can only self-heal once and it is difficult to achieve multiple self-healing. The service life is still short, and the self-healing effect is general, which needs to be further improved.

[0027] In an alternating magnetic field, an induction heating material can generate an induced current inside it. When the induced current overcomes the resistance of the material itself, it will generate heat energy and increase its own temperature. At present, there are many studies on induction heating materials in the preparation of self-healing asphalt concrete, but self-healing asphalt concrete mainly considers the heating performance of induction heating materials. Studies have shown that the higher the amount of induction heating materials added, the higher the heating rate of asphalt concrete. However, when preparing potting glue, adding induction heating materials to asphalt will increase the softening point of asphalt. If the amount added is too large, it will eventually affect the fluidity of the potting glue. Therefore, it is necessary to combine the characteristics of the asphalt softening point and select the appropriate type of induction heating material in a targeted manner, and control the two within the appropriate ratio range, so that the potting glue can flow and achieve self-healing during induction heating. At the same time, the addition of induction heating materials makes its softening point higher than that of conventional asphalt potting glue, which is conducive to avoiding high-temperature loss.

[0028] The invention provides an induction heating remodeling self-healing asphalt potting glue, which realizes the self-healing effect of the potting glue by adding an induction heating material, and selects a specific type and a suitable addition range of the induction heating material in combination with the characteristics of the softening point of the matrix asphalt. Preferably, when the softening point of the matrix asphalt is low, a proper amount of materials with strong induction heating characteristics such as one or more combinations of steel slag powder and steel sand powder is added; and when the softening point of the matrix asphalt is high, a small amount of materials with strong induction heating characteristics such as one or more combinations of iron powder, nickel-zinc ferrite powder and manganese-zinc ferrite is added; so that the softening point of the asphalt can be improved to avoid high-temperature loss, and the potting glue can flow during induction heating, and the continuous self-healing effect is good; in addition, in order to enable the asphalt to flow under the condition of low energy such as induction heating, the asphalt in the invention is selected to have a lower softening point than the asphalt in the ordinary potting glue, but the asphalt has a low softening point and its elastic recovery force is poor, and the elastic recovery force of the potting glue is improved by properly adding desulfurized rubber powder, but the addition amount thereof needs to be controlled within a suitable range so that it does not affect the fluidity of the potting glue during induction heating, realizes automatic repair, and achieves the self-healing effect.

[0029] An induction heating remodeling self-healing asphalt potting glue comprises, by mass percentage of the asphalt potting glue, 50% to 70% of base asphalt, 20% to 40% of desulfurized rubber powder and 10% to 20% of an induction heating heat-inducing material; the induction heating heat-inducing material comprises one or more combinations of iron powder, nickel-zinc ferrite powder, manganese-zinc ferrite powder, steel slag powder and steel sand powder; the addition amount of the induction heating heat-inducing material is controlled at 10% to 20%, so as to ensure that the asphalt potting glue has the ability of heating self-healing without affecting the fluidity of the asphalt potting glue.

[0030] The softening point of the matrix asphalt is in the range of 40-50°C, mainly because the addition of induction heating inducing materials will cause the asphalt softening point to increase, and the softening point will affect the flow value; if the asphalt softening point is too high, the asphalt sealant will be difficult to soften during induction heating of the repair gap, and will not flow and will not achieve the effect of automatic repair; if the asphalt softening point is too low, the elastic recovery ability of the asphalt sealant will be poor.

[0031] The asphalt softening point is 45-50°C, and preferably 10-15% iron powder, nickel-zinc ferrite powder or manganese-zinc ferrite powder or a combination thereof is added, and the particle size thereof is less than 0.075mm; nickel-zinc ferrite powder and manganese-zinc ferrite powder have high magnetic permeability but are expensive. These heat-induced materials have good heating performance. When the asphalt softening point is high, that is, the fluidity is low, adding a small amount of them can reduce the influence of the heat-induced material itself on the fluidity of the asphalt potting glue, and secondly, it is conducive to controlling costs;

[0032] The asphalt softening point is 40-45°C, and it is preferred to add 15-20% steel slag powder and / or steel grit powder; steel slag and steel grit powder have low magnetic permeability but low price. When the asphalt softening point is low, that is, the fluidity is high, even if these heat-induced materials are added in large amounts, the effect on the fluidity of the asphalt potting glue is small, and it is also helpful to avoid high-temperature loss; the steel slag powder and / or steel grit powder has a particle size of less than 0.075 mm, which is conducive to mixing;

[0033] The desulfurized rubber powder has a particle size of 30-50 mesh and a relative density of 1.10-1.30 g / cm 3 , the water content is less than 1%. The rubber modified asphalt obtained by adding this desulfurized rubber powder has better performance and can meet the relevant technical requirements; the amount of desulfurized rubber powder added determines the elastic recovery force of the asphalt potting glue, but too much rubber powder added will lead to low fluidity of the asphalt potting glue, while too little rubber powder added will lead to poor elastic recovery of the asphalt potting glue. Controlling the addition amount to 20% to 40% can ensure good elastic recovery of the asphalt potting glue without affecting the fluidity of the asphalt potting glue.

[0034] Preferably, the asphalt softening point is 45-50°C, the amount of base asphalt added is 50-60 parts, the amount of desulfurized rubber powder added is 30-40 parts, and the amount of induction heating material added is 10-15 parts. The induction heating material is preferably one or more combinations of iron powder, nickel-zinc ferrite powder or manganese-zinc ferrite powder;

[0035] Preferably, the asphalt softening point is 40-45°C, the amount of base asphalt added is 60-70 parts, the amount of desulfurized rubber powder added is 20-30 parts, and the amount of induction heating material added is 15-20 parts. The induction heating material is preferably steel slag powder and / or steel sand powder.

[0036] In addition, the present invention also provides a method for preparing an induction heating remodeling self-healing asphalt potting glue, which comprises the following steps:

[0037] (1) heating and softening the base asphalt to a flowable state, adding the desulfurized rubber powder according to a preset ratio, and shearing at a high speed at a preset temperature until the rubber is fully swollen and evenly dispersed to obtain a rubber-modified asphalt binder;

[0038] The preset ratio is 50-70 parts by mass of base asphalt and 20-40 parts of desulfurized rubber powder; the preset temperature is preferably an oil bath temperature of 190-210°C; the high-speed shearing is preferably stirred at a speed of 3000-5000rpm for 45-120min. Under such high-speed shearing conditions, the rubber is fully swollen and evenly dispersed, and the obtained rubber-modified asphalt has good technical performance;

[0039] (2) After obtaining the rubber-modified asphalt binder, the high-speed shear and temperature are maintained unchanged, and the induction-heatable thermal induction material is added according to the preset addition amount, and stirred at a low speed until the induction-heating material is evenly dispersed in the rubber-modified asphalt, thereby obtaining an asphalt potting glue that can be self-healed by induction heating.

[0040] The preset addition amount is calculated as a percentage of the total amount of each component of the asphalt potting glue, and 10% to 20% of the induction heating material is added; the low-speed stirring condition is stirring at a speed of 400-600rpm for 20-40min. Under this low-speed stirring condition, the induction heating material can be evenly dispersed in the rubber modified asphalt, and the aging of the rubber modified asphalt can be reduced.

[0041] The following are examples:

[0042] Example 1 Induction heating remodeling self-healing asphalt potting glue 1

[0043] The induction heating refolding self-healing asphalt potting glue 1 comprises, by mass percentage, 60% of No. 70 base asphalt, 30% of desulfurized rubber powder, and 10% of induction heating heat-inducing material, wherein the induction heating heat-inducing material is nickel-zinc ferrite powder with a particle size of less than 0.075 mm; and is obtained according to the following preparation method:

[0044] 60% of No. 70 base asphalt is placed in a stirring tank, and the stirring tank is placed in a constant temperature oil bath for heating at 185°C for 120 minutes, at which time the base asphalt is softened to a flow state that can be sheared at high speed; keeping the oil bath temperature unchanged, 30% of desulfurized rubber powder is added, and a high-speed shearing instrument is started, and high-speed stirring is performed at a speed of 4000rpm for 60 minutes to obtain a rubber-modified asphalt binder;

[0045] After obtaining the rubber modified asphalt binder, the oil bath temperature of the high-speed shear instrument is kept unchanged, and 10% of the induction-heatable thermal induction material is added, and a blade mixer is used to evenly stir at a speed of 200 rpm for 30 minutes to obtain an asphalt potting glue that can be self-healed by induction heating.

[0046] Example 2 Induction heating remodeling self-healing asphalt potting glue 2

[0047] The induction heating remodeling self-healing asphalt potting glue 2, calculated by mass percentage, includes 60% of No. 90 base asphalt, 30% of desulfurized rubber powder, and 10% of induction heating thermal induction material. The induction heating thermal induction material is iron powder, and its particle size is less than 0.075 mm, which is prepared according to the preparation method in Example 1.

[0048] Example 3 Induction heating remodeling self-healing asphalt potting glue 3

[0049] The induction heating remodeling self-healing asphalt potting glue 3, calculated by mass percentage, includes 65% of No. 70 base asphalt, 20% of desulfurized rubber powder, and 15% of induction heating thermal induction material. The induction heating thermal induction material is steel sand powder, and its particle size is less than 0.075 mm, which is prepared according to the preparation method in Example 1.

[0050] Example 4 Induction heating remodeling self-healing asphalt potting glue 4

[0051] The induction heating remodeling self-healing asphalt potting glue 4, calculated by mass percentage, includes 65% No. 70 base asphalt, 25% desulfurized rubber powder, and 10% induction heating thermal induction material. The induction heating thermal induction material is a composite powder of 5% nickel-zinc ferrite powder and 5% iron powder, and its particle size is less than 0.075 mm. It is prepared according to the preparation method in Example 1.

[0052] Example 5 Induction heating remodeling self-healing asphalt potting glue 5

[0053] The induction heating remodeling self-healing asphalt potting glue 5, calculated by mass percentage, includes 50% No. 70 base asphalt, 30% desulfurized rubber powder, and 20% induction heating thermal induction material. The induction heating thermal induction material is nickel zinc ferrite powder with a particle size of less than 0.075 mm, which is prepared according to the preparation method in Example 1.

[0054] Example 6 Induction heating remodeling self-healing asphalt potting glue 6

[0055] The induction heating remodeling self-healing asphalt potting glue 6, calculated by mass percentage, includes 50% No. 90 base asphalt, 40% desulfurized rubber powder, and 10% induction heating thermal induction material. The induction heating thermal induction material is steel sand powder with a particle size of less than 0.075 mm, which is prepared according to the preparation method in Example 1.

[0056] Example 7 Induction heating remodeling self-healing asphalt potting glue 7

[0057] The induction heating remodeling self-healing asphalt potting glue 7, calculated by mass percentage, includes 50% No. 110 base asphalt, 30% desulfurized rubber powder, and 20% induction heating thermal induction material. The induction heating thermal induction material is a compound powder of 10% steel sand powder and 10% iron powder, and its particle size is less than 0.075 mm. It is prepared according to the preparation method in Example 1.

[0058] Comparative Example 1 Asphalt potting glue 1

[0059] The asphalt potting glue 1 comprises, by mass percentage, 60% of No. 70 base asphalt and 40% of desulfurized rubber powder, and is obtained according to the following preparation method:

[0060] 60% of No. 70 base asphalt was placed in a stirring tank, and the stirring tank was heated in a constant temperature oil bath at 185°C for 120 min. At this time, the base asphalt was softened to a flow state that can be sheared at high speed. Keeping the oil bath temperature unchanged, 40% of desulfurized rubber powder was added, and the high-speed shearing instrument was started. The mixture was stirred at a speed of 4000 rpm for 60 min to obtain asphalt potting glue 1.

[0061] Comparative Example 2 Asphalt potting glue 2

[0062] The asphalt potting glue 2 includes, by mass percentage, 60% of No. 90 base asphalt and 40% of desulfurized rubber powder. The raw materials are the same as those in Example 2 and are obtained according to the preparation method in Comparative Example 1.

[0063] Comparative Example 3 Asphalt potting glue 3

[0064] The asphalt potting glue 3 includes, by mass percentage, 65% of No. 70 base asphalt and 35% of desulfurized rubber powder. The raw materials are the same as those in Example 3 and are obtained according to the preparation method in Comparative Example 1.

[0065] Comparative Example 4 Asphalt potting glue 4

[0066] The asphalt potting compound 4 comprises, by mass percentage, 65% of No. 90 base asphalt and 35% of desulfurized rubber powder. The raw materials are the same as those of Example 4 and are obtained according to the preparation method in Comparative Example 1.

[0067] Comparative Example 5 Asphalt potting glue 5

[0068] The asphalt potting glue 5 includes, by mass percentage, 50% of No. 70 base asphalt and 50% of desulfurized rubber powder. The raw materials are the same as those in Example 5 and are obtained according to the preparation method in Comparative Example 1.

[0069] Comparative Example 6 Asphalt Potting Glue 6

[0070] The asphalt potting glue 6 includes, by mass percentage, 50% of No. 90 base asphalt and 50% of desulfurized rubber powder. The raw materials are the same as those of Example 6 and are obtained according to the preparation method in Comparative Example 1.

[0071] Comparative Example 7 Asphalt potting glue 7

[0072] The asphalt potting glue 7 includes, by mass percentage, 50% of No. 110 base asphalt and 50% of desulfurized rubber powder. The raw materials are the same as those of Example 7 and are obtained according to the preparation method in Comparative Example 1.

[0073] The induction heating self-healing asphalt potting glue obtained in the above examples 1-7 and the asphalt potting glue obtained in comparative examples 1-7 were subjected to performance tests. The specific performance test method is as follows:

[0074] The performance test of the sealant was conducted in accordance with the methods in JT-T 2009-740 "Standard for Sealing Glues for Cracks in Asphalt Pavements" and JTG E20-2011 "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering". The three-point bending self-healing test was conducted using a BBR beam specimen, and the strength recovery rate under induction heating after the specimen was broken was used to characterize its healing performance. The specific steps are as follows:

[0075] First, a 35mm×1.5mm×2mm crack was cut out of the small beam specimen with a cutting machine and the sample was placed in a UTM-25 universal testing machine and kept at -10℃ for 4 hours. After the insulation, the semicircular specimen was subjected to three-point bending failure. Then, the mixture specimen was fixed with a clamp, the crack width was controlled to 4mm, and the three sides of the specimen were sealed with heat-resistant tape. After cooling at room temperature for 4 hours, the prepared potting glue was heated to 200℃ and poured into the crack and cooled at room temperature for 2 hours. It was placed in a UTM-25 universal testing machine and kept at -10℃ for 4 hours, and the load peak S0 at the first failure was recorded; it was placed under an electromagnetic induction coil, and induction heating was performed after adjusting the parameters of the induction heating equipment and controlling the heating distance. After heating for a certain period of time, the heating was stopped and cooled; finally, the specimen was placed in a universal testing machine and kept at -10℃ for 4 hours and three-point bending failure was performed, and the load peak S1 at the second failure was recorded.

[0076] Repeat the above steps to perform healing multiple times. When the universal testing machine is used to destroy the specimen, the spindle is pressed down at a speed of 5mm / min and the experimental temperature is -10℃, mainly to make the specimen complete brittle fracture without creep. The test method flow is shown below Figure 1 As shown in the figure, the strength recovery rate of asphalt concrete after the three-point bending test is calculated as follows:

[0077] The performance test results of the induction heating remodeling self-healing asphalt potting glue in the above embodiment and the asphalt potting glue in the comparative example are specifically shown in Table 1 below. The healing performance test results of the induction heating remodeling self-healing asphalt potting glue in the embodiment and the asphalt potting glue in the comparative example are specifically shown in Table 2 below:

[0078] Table 1 Performance test results of asphalt potting glue in the examples and comparative examples

[0079]

[0080] By analyzing the test results of the embodiments and comparative examples, it is found that the use of induction heating induction materials of equal mass to replace rubber powder slightly reduces the softening point and elastic recovery rate, and slightly increases the cone penetration. At the same time, with the decrease of asphalt percentage content and asphalt type, the softening point and elastic recovery rate are slightly increased, and the cone penetration is slightly reduced. According to the potting glue performance test JT-T 2009-740 "Standard for Potting Glue for Cracks in Asphalt Pavement", it can be seen from the data in Table 1 that the softening point of all embodiments and comparative examples is greater than 80°C, the elastic recovery rate is greater than 40%, the -10°C low temperature stretching is passed, and the cone penetration is between 30°C and 70°C, which meets the technical requirements of ordinary potting glue.

[0081] Table 2 Healing performance test results of asphalt potting glue in the examples and comparative examples

[0082]

[0083] As shown in Tables 1 and 2, the above embodiments and comparative examples meet the technical requirements of potting glue and add some induction heating materials. After induction heating, the strength recovery rate can reach 80%, while when no induction heating materials are added, the strength is almost not recovered. At the same time, the test results show that the higher the content of induction heating heat-inducing materials, the higher the strength recovery rate. And the strength recovery rate of nickel-zinc ferrite is the highest under the same mass.

[0084] Compared with the asphalt potting glue in the comparative example, the potting glue capable of self-healing by induction heating obtained in the embodiment meets the technical index requirements of ordinary potting glue in JT-T 2009-740 "Standard for Potting Glues for Cracks in Asphalt Pavement", and the healing effect of the potting glue is significantly improved, and the number of healing times and the timing of healing are controllable.

[0085] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An induction heating remodeling self-healing asphalt potting glue, characterized in that: It includes base asphalt, desulfurized rubber powder and induction heating material, in which base asphalt accounts for 50% to 70%, desulfurized rubber powder accounts for 20% to 40% and induction heating material accounts for 10% to 20% according to the percentage of the total amount of components; The induction heating material has a particle size of less than 0.075 mm and includes one or more combinations of iron powder, nickel-zinc ferrite powder, manganese-zinc ferrite powder, steel slag powder and steel sand powder; The base asphalt has a softening point of 40-50°C; The desulfurized rubber powder has a particle size of 30-50 mesh and a relative density of 1.10-1.30 g / cm 3 , water content is less than 1%; The asphalt softening point is 45-50°C, and the induction heating material accounts for 10%-15%. The induction heating material includes one or more combinations of iron powder, nickel-zinc ferrite powder or manganese-zinc ferrite powder; the asphalt softening point is 40-45°C, and the induction heating material accounts for 15%-20%. The induction heating material includes one or more combinations of steel slag powder and / or steel sand powder.

2. The induction heating remodeling self-healing asphalt potting glue according to claim 1, characterized in that: According to the mass percentage, the base asphalt is 50-60 parts, the desulfurized rubber powder is 30-40 parts and the induction heating material is 10-15 parts, and the induction heating material is one or more combinations of iron powder, nickel-zinc ferrite powder or manganese-zinc ferrite powder; Calculated by weight, the base asphalt is 60-70 parts, the desulfurized rubber powder is 20-30 parts and the induction heating material is 15-20 parts, and the induction heating material is steel slag powder and / or steel sand powder.

3. A method for preparing the induction heating remodeling self-healing asphalt potting glue as claimed in claim 1 or 2, characterized in that: The following steps are involved: The base asphalt is heated and softened to a flowable state, the desulfurized rubber powder is added according to a preset ratio, and high-speed shearing is performed at a preset temperature until the rubber powder is fully swollen and evenly dispersed in the asphalt to obtain a rubber-modified asphalt binder; After obtaining the rubber modified asphalt binder, keep the high-speed shear and temperature unchanged, add the induction heating material according to the preset addition amount, and stir at a low speed until the induction heating material is evenly dispersed in the rubber modified asphalt, so as to obtain the asphalt potting glue that can be self-healed by induction heating; The high-speed shearing is carried out by high-speed stirring for 45-120 minutes at a rotation speed of 3000-5000 rpm and a stirring temperature of 190-210° C.; The low-speed stirring is stirring at a rotation speed of 400-600 rpm for 20-40 min, and the stirring temperature is 180-200° C.

4. The method for preparing the induction heating remodeling self-healing asphalt potting glue according to claim 3, characterized in that: Calculated as a percentage of the total amount of components, when the induction heating material is one or more combinations of iron powder, nickel-zinc ferrite powder or manganese-zinc ferrite powder, 10%-15% is added; when it is one or more combinations of steel slag powder and / or steel sand powder, 15%-20% is added.

5. The method for preparing the induction heating remodeling self-healing asphalt potting glue according to claim 4, characterized in that: The preset proportion, calculated by weight, is 50-70 parts of base asphalt and 20-40 parts of desulfurized rubber powder; the preset temperature is 190-210°C.

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