Asphalt pavement preventive maintenance technology and material determination method

Abstract

The present application relates to the field of road maintenance engineering, in particular to a kind of asphalt pavement preventive maintenance technology and material determination method, the present application considers with water permeability coefficient index, designs the lower limit value of preventive maintenance material dosage, can guarantee the functional requirement of preventive maintenance material application, effectively closes pavement void, prevents water from entering, improves the ability of road surface to resist water damage;With the index of construction depth as the consideration, the upper limit value of the amount of preventive maintenance material is designed, which can ensure the driving safety after the application of the preventive maintenance material, ensure that the pavement has a construction depth that meets the requirements, can drain the water on the road in time and ensure the driving safety of the road. And the present application limits the amount of preventive maintenance material by setting water permeability coefficient index and construction depth index, can select the preventive maintenance material type that meets water permeability coefficient index and construction depth index at the same time and reduce the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of road maintenance engineering, in particular, the present application relates to a kind of asphalt pavement preventive maintenance technology and material determination method. BACKGROUND

[0002] Asphalt film shedding of in-service pavement, asphalt aging, surface microcrack, pavement water seepage, local water seepage caused by construction of new pavement are common quality problems of asphalt pavement, in order to ensure that asphalt pavement does not produce greater disease due to the above quality problems, often need to intervene preventive maintenance measures.

[0003] Asphalt pavement preventive maintenance refers to the road maintenance measures taken in advance to prevent disease occurrence or slight disease, slow down the decline of pavement performance and improve service function, which has multiple technical types such as coating, seal coat, overlay and hot-in-place recycling. For quality problems such as asphalt film shedding, asphalt aging, surface microcrack and pavement water seepage, preventive maintenance achieves two goals:

[0004] (1) Preventive maintenance function, i.e. to improve asphalt film shedding, asphalt aging and pavement water seepage;

[0005] (2) Road anti-skid safety is maintained, i.e. to maintain or provide sufficient structure to ensure driving safety.

[0006] Because the pavement does not appear serious damage, coating and seal coat preventive maintenance technology is usually more suitable, but the specific selection of which technology and material is more scientific and economic is a practical problem in engineering practice.

[0007] Coating preventive maintenance technology is to spray coating preventive maintenance material on the road surface, which can form a thin film after curing, reduce the pavement water seepage coefficient and achieve the purpose of improving water damage resistance, and can also inhibit loose, which is commonly used for preventive maintenance of asphalt pavement and reinforcement of water seepage area of new asphalt pavement.

[0008] Coating preventive maintenance material can effectively reduce the pavement water seepage coefficient and improve the pavement water resistance, but spraying will also cause the decline of road macro surface structure depth. Good structure depth can effectively drain the water between the wheel and the road surface in rainy days, thereby improving the friction coefficient and ensuring driving safety. Therefore, water seepage coefficient and structure depth are two indexes that need to be considered in the application process of coating preventive maintenance technology, one represents the functional effect of material application, and the other represents driving safety. If the coating preventive maintenance material is not properly selected, it is not easy to improve the pavement water seepage while ensuring the structure depth.

[0009] But the prior art in the process of determining the preventive maintenance technology and material type, generally do not consider the technical indicators and economic indicators such as water permeability coefficient, construction depth, more rely on experience to determine, the selection is more blind. Therefore, how to select the appropriate type of preventive maintenance technology and materials according to the actual situation of the road surface is the common demand of realizing the function effect of preventive maintenance and driving safety, and taking into account the economy. SUMMARY

[0010] The purpose of the present application is to provide a method for determining asphalt pavement preventive maintenance technology and materials, to solve the problem of the lack of scientific pavement preventive maintenance design method in the prior art, which causes the pavement preventive maintenance material function effect and driving safety to be unable to effectively coordinate, and the pavement maintenance effect is uncertain.

[0011] The technical problem to be solved by the present application is solved by the following technical scheme: a method for determining asphalt pavement preventive maintenance technology and materials, comprising the following steps:

[0012] S1. Determine the pavement that meets the preventive maintenance;

[0013] S2. Select a representative area T on the pavement to be prevented and maintained;

[0014] S3. Select a coating type preventive maintenance material, uniformly spread the coating type preventive maintenance material in the area T, and the mass is the initial estimated material amount M0;

[0015] S4. After the coating type preventive maintenance material is completely cured into a film, test the construction depth TD1 of the area T;

[0016] When TD1≥TD 下限 , execute step S5;

[0017] When TD1<TD 下限 , reduce the amount of coating type preventive maintenance material in step S3 and repeat S4 until the amount of coating type preventive maintenance material can meet the requirement of TD1≥TD 下限 , and then execute step S5;

[0018] S5. Test the water permeability coefficient K1 of the T area;

[0019] When K1≤K 上限 , execute step S6;

[0020] When K1>K 上限 , increase the amount of coating type preventive maintenance material in step S3 and repeat S4, S5 until the amount of coating type preventive maintenance material can meet the requirements of TD1≥TD 下限 and K1≤K 上限 , and then execute step S6;

[0021] When K1>K 上限 , then increase the amount of coating type preventive maintenance material in step S3 and repeat S4, S5, if the amount of coating type preventive maintenance material cannot meet the requirements of TD1≥TD 下限 and K1≤K 上限 at the same time, it indicates that the coating type preventive maintenance material is not suitable for the road to be maintained, and the type of coating type preventive maintenance material in step S3 is replaced, and steps S4, S5 are repeated;

[0022] S6. Determine the type and amount M of coating type preventive maintenance material for the road to be maintained;

[0023] In step S5, the type of coating type preventive maintenance material in step S3 is still not replaced, and the requirements of TD1≥TD 下限 and K1≤K 上限 cannot be met at the same time, which indicates that the coating type preventive maintenance technology is not suitable for the road to be maintained, and other preventive maintenance technologies are selected;

[0024] TD 下限 and K 上限 in the above steps are preset values.

[0025] The technical scheme of the present application also has: the other preventive maintenance technology is preferably a seal coat type preventive maintenance technology. It has been proved in practice that if the coating type preventive maintenance technology is considered to be suitable when selecting the maintenance technology, the diseases commonly existing in the road to be maintained are asphalt film peeling, asphalt aging, surface micro-cracks, and road water seepage, at this time, it is not necessary to use a more advanced and more thorough maintenance method, such as high-cost and long-period milling and repaving. After judging that the coating type maintenance technology is not suitable, the seal coat type preventive maintenance technology which has better effect than the coating type is usually selected, and the standard requirements of the present application are also applicable to the seal coat type maintenance technology, and other maintenance technologies have independent standard requirements.

[0026] The technical scheme of the present application also has: the determination method of the road to be maintained which meets the preventive maintenance in step 1 is: detecting the construction depth TD0 and the water seepage coefficient K0 of the road to be maintained;

[0027] When TD0≥TD 下限 , step S2 is executed;

[0028] When TD0<TD 下限 , the road to be maintained is not suitable for the coating type preventive maintenance technology, and the seal coat type preventive maintenance technology is selected to improve the road skid resistance.

[0029] The technical scheme of the present application also has: the calculation formula of the initial estimated material amount M0 in step S3 is as follows:

[0030] M0=μ*S*TD0*ρ / 4000

[0031] In the formula, M0 is the initial estimated material amount, in kg / m 2 ;

[0032] μ is a calculation coefficient, the value range is 0-1, which is related to the water permeability coefficient K0 of the region T, and the greater K0 is, the greater μ is;

[0033] S is the area of the region T, in m 2 ;

[0034] TD0 is the construction depth of the region T, in mm;

[0035] ρ is the density of the coating type preventive maintenance material, in kg / m 3 . In the prior art, the amount of the coating type preventive maintenance material is usually directly determined according to experience, without considering the influence of the differences of different pavement construction depths, water permeability coefficients and other factors on the initial estimated material, and the formula for estimating the initial material amount is provided in the application, and the initial material amount is estimated according to the principle that the coating type preventive maintenance material can still fill a certain construction depth of the pavement after being penetrated and solidified. On this basis, the material amount is optimized and adjusted through the water permeability index and the construction depth index, so that the functionality, safety and economy can be effectively considered.

[0036] The technical scheme of the application further has that the amount of the coating type preventive maintenance material for the road surface to be maintained in step S6 is the amount of the region T, so that the amount of the coating type preventive maintenance material per unit area of the road surface to be maintained is obtained.

[0037] The technical scheme of the application further has that the coating type preventive maintenance material includes but is not limited to any one of a silicone material, an emulsified asphalt material, a hot asphalt material or an asphalt regeneration material.

[0038] The technical scheme of the application further has that the coating type preventive maintenance material is selected from a silicone material. The silicone maintenance material and its application is a new coating type preventive maintenance technology, the silicone maintenance material is sprayed on the road surface, and a colorless and transparent film can be formed after solidification, the water permeability coefficient of the pavement is reduced, the purpose of improving the water damage resistance is achieved, and the looseness can be inhibited. The silicone maintenance material is used as the coating type preventive maintenance material, and is commonly used for the preventive maintenance of the asphalt pavement and the reinforcement of the water permeation region of the newly built asphalt pavement.

[0039] The technical scheme of the application further has that the region T in step S2 is a rectangle. The region T is set as a rectangle, so that the area of the region T is conveniently calculated.

[0040] The technical scheme of the application further has that the road surface to be prevented and maintained is an asphalt concrete pavement, and the highway grade is not limited. The pavement construction depth is an index for representing the roughness of the pavement, and the TD of the application is determined according to different highway grades and annual average rainfall.下限 value.

[0041] The technical scheme of the present application further has: in the steps S1-S6, the test method for the construction depth is T0961-1995 or T0962-1995; the test method for the water permeation coefficient is T0971-2019. Both the test method for the construction depth and the test method for the water permeation coefficient are mature test methods in the prior art system, which can effectively guarantee the accuracy of the results of the present application method and is beneficial to popularization.

[0042] Compared with the prior art, the present application has the beneficial effects that:

[0043] The present application considers the water permeation coefficient index to design the lower limit value of the preventive maintenance material dosage, which can guarantee the functional requirements of the preventive maintenance material application, effectively seal the pavement voids, prevent water from entering, and improve the water damage resistance of the pavement; the upper limit value of the preventive maintenance material dosage is designed by considering the construction depth index, which can guarantee the driving safety after the application of the preventive maintenance material, guarantee the pavement to have a construction depth meeting the requirements, and timely drain the water on the pavement to ensure the driving safety of the pavement.

[0044] And the present application limits the dosage of the preventive maintenance material by setting the water permeation coefficient index and the construction depth index, which can select the type of the preventive maintenance material that meets both the water permeation coefficient index and the construction depth index and reduce the cost.

[0045] The present application sets the water permeation coefficient index and the construction depth index, and when the initial construction depth of the pavement does not meet the TD 下限 value determined by the present application or the coating type preventive maintenance technology cannot meet both the water permeation coefficient index and the construction depth index, the seal coat type preventive maintenance technology or other preventive maintenance technology can be selected to determine a more suitable asphalt pavement preventive maintenance technology. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 The flowchart of the asphalt pavement preventive maintenance technology and material determination method of the present application is shown. DETAILED DESCRIPTION

[0047] The present application will be further described below in combination with the embodiments.

[0048] The pavement to be prevented and maintained in the present embodiment is a certain expressway, the pavement to be prevented and maintained is an asphalt concrete pavement, the TD 下限 is 0.55mm, and the K 上限 is 80ml / min. The higher the highway level is, the lower the K 上限 is, and 80ml / min is the requirement for expressways and first-class roads.

[0049] The coating type preventive maintenance material is selected from silicone material, and the silicone material includes silicone resin solution, penetrant and tackifier, has a density p of 650-950 kg / m 3 , a Brookfield viscosity of 20-30 mPa·s at 25℃, a bonding strength of ≥0.3 MPa at 25℃ and a permeation pressure of ≥1.0 MPa. The bonding strength of the silicone maintenance material is tested according to GB / T 16777-1997, and the permeation pressure is tested according to JC / T 894-2001.

[0050] As shown in Figure 1 , a bituminous pavement preventive maintenance technology and material determination method, "N" in the figure represents "not meeting the determination standard", and "Y" in the figure represents "meeting the determination standard", and includes the following steps:

[0051] S1. Determine the pavement meeting the coating type preventive maintenance.

[0052] S2. Select a representative area T on the pavement to be prevented and maintained.

[0053] S3. Select the coating type preventive maintenance material, uniformly spread the coating type preventive maintenance material in the area T, and the mass is the initial estimated material amount M0.

[0054] S4. After the coating type preventive maintenance material is completely cured into a film, test the structure depth TD1 of the area T.

[0055] When TD1≥TD 下限 , execute step S5.

[0056] When TD1<TD 下限 , reduce the amount of the coating type preventive maintenance material in step S3 and repeat S4 until the amount of the coating type preventive maintenance material meets the requirement of TD1≥TD 下限 , and then execute step S5.

[0057] S5. Test the water permeation coefficient K1 of the area T.

[0058] When K1≤K 上限 , execute step S6.

[0059] When K1>K 上限 , increase the amount of the coating type preventive maintenance material in step S3 and repeat S4 and S5 until the amount of the coating type preventive maintenance material meets the requirements of TD1≥TD 下限 and K1≤K 上限 , and then execute step S6.

[0060] When K1>K 上限If TD0≥TD, then increase the amount of coating type preventive maintenance material in step S3 and repeat S4 and S5. If the amount of the coating type preventive maintenance material cannot meet the requirements of TD1≥TD 下限 and K1≤K 上限 at the same time, it indicates that the coating type preventive maintenance material is not suitable for the road to be maintained, and the type of the coating type preventive maintenance material in step S3 is replaced, a coating type preventive maintenance material with stronger penetration ability and greater film thickness is selected, and steps S4 and S5 are repeated.

[0061] S6. Determine the type and amount M of the coating type preventive maintenance material for the road to be maintained.

[0062] If the type of the coating type preventive maintenance material in step S3 is replaced and the requirements of TD1≥TD 下限 and K1≤K 上限 cannot be met at the same time, it indicates that the coating type preventive maintenance technology is not suitable for the road to be maintained, and other preventive maintenance technologies are selected, such as seal coat type preventive maintenance technology.

[0063] TD 下限 and K 上限 in the above steps are preset values.

[0064] The determination method of the road surface that meets the preventive maintenance in step 1 is to detect the construction depth TD0 and the water permeability coefficient K0 of the road to be maintained. The test method of the construction depth is T0961-1995 or T0962-1995, and the test method of the water permeability coefficient is T0971-2019.

[0065] When TD0≥TD 下限 , step S2 is performed.

[0066] When TD0<TD 下限 , the road to be maintained is not suitable for coating type preventive maintenance, and seal coat type preventive maintenance technology is selected to improve the road surface skid resistance.

[0067] The calculation formula of the initial estimated material amount M0 in step S3 is as follows:

[0068] M0=μ*S*TD0*ρ / 4000

[0069] In the formula, M0 is the initial estimated material amount, and the unit is kg / m 2 .

[0070] μ is a calculation coefficient, the value range is 0-1, and it is related to the water permeability coefficient K0 of the region T. The larger K0 is, the larger μ is. The value can be selected according to the following table:

[0071] Table 1 μ recommended value

[0072]

[0073] S is the area of region T, unit: m 2 ; the region T in step S2 is a square region with an area of 500 mm*500 mm.

[0074] TD0 is the construction depth of region T, unit: mm.

[0075] ρ is the density of the coating type preventive maintenance material, unit: kg / m 3 .

[0076] The amount M of the coating type preventive maintenance material to be maintained on the road surface in step S6 is the amount of region T, so as to obtain the amount of the coating type preventive maintenance material per unit area on the road surface. Each time the amount M or type of the coating type preventive maintenance material to be maintained on the road surface is adjusted, a new region T is selected for spreading.

Claims

1. A method for determining asphalt pavement prevention and maintenance technologies and materials, characterized in that, Includes the following steps: S1. Determine the road surface that meets the requirements for preventive maintenance; S2. Select a representative area T on the road surface to be preventively maintained; S3. Select a coating-type preventive and maintenance material, and evenly spray the coating-type preventive and maintenance material in area T, with a mass equal to the initial estimated material usage M0; S4. Once the coating-type preventive and protective material has completely cured into a film, the test area T has a structural depth TD1. When TD1≥TD 下限 When the time comes, proceed to step S5; When TD1 < TD 下限 If the amount of coating-type preventive and protective material used in step S3 is reduced, and step S4 is repeated until the amount of coating-type preventive and protective material used satisfies TD1 ≥ TD. 下限 After meeting the requirements, proceed to step S5; S5. Test the permeability coefficient K1 in area T; When K1≤K 上限 When the time comes, proceed to step S6; When K1>K 上限 If the amount of coating-type preventive and protective material used in step S3 is increased, and steps S4 and S5 are repeated until the amount of coating-type preventive and protective material used satisfies TD1 ≥ TD. 下限 and K1≤K 上限 After meeting the requirements, proceed to step S6; When K1>K 上限 If the amount of coating-type preventive and protective material used in step S3 is increased, and steps S4 and S5 are repeated, then if the amount of coating-type preventive and protective material used cannot simultaneously satisfy TD1 ≥ TD... 下限 and K1≤K 上限 The requirement indicates that the coating-type preventive maintenance material is not suitable for the road surface to be maintained. Change the type of coating-type preventive maintenance material in step S3 and repeat steps S4 and S5. S6. Determine the type of coating-type preventive maintenance material and the amount M of coating-type preventive maintenance material to be used on the road surface to be maintained; In step S5, even if the type of coating-type preventive maintenance material used in step S3 is changed, it is still impossible to simultaneously satisfy TD1≥TD. 下限 and K1≤K 上限 The requirements indicate that coating-based preventive maintenance technologies are not suitable for the road surface to be maintained, and other preventive maintenance technologies should be selected. TD in the above steps 下限 and K 上限 This is the default value.

2. The asphalt pavement prevention and maintenance technology and material determination method according to claim 1, characterized in that: Other preventative maintenance techniques are preferred, such as sealing layer preventative maintenance techniques.

3. The asphalt pavement prevention and maintenance technology and material determination method according to claim 1, characterized in that, The method for determining the pavement that meets the requirements for preventive maintenance in step 1 is as follows: detect the pavement texture depth TD0 and permeability coefficient K0. When TD0≥TD 下限 When the time comes, proceed to step S2; When TD0 < TD 下限 In such cases, coating-type preventive maintenance is not suitable for the road surface to be maintained; instead, sealing-type preventive maintenance technology should be selected to improve the road surface's anti-skid properties.

4. The asphalt pavement prevention and maintenance technology and material determination method according to claim 1, characterized in that, The formula for calculating the initial estimated material usage M0 in step S3 is as follows: M0 = μ * S * TD0 * ρ / 4000 In the formula, M0 represents the initial estimated material consumption, in kg / m³. 2 ; μ is a calculation coefficient, with a value range of 0 to 1. It is related to the permeability coefficient K0 of region T. The larger K0 is, the larger μ is. S is the area of ​​region T, in meters. 2 ; TD0 represents the structural depth of region T, in mm; ρ represents the density of coating-type preventive and maintenance materials, in kg / m³. 3 .

5. The asphalt pavement prevention and maintenance technology and material determination method according to claim 1, characterized in that: In step S6, the amount M of the coating-type preventive maintenance material used on the road surface to be maintained is the amount used in area T, thus obtaining the amount of coating-type preventive maintenance material used per unit area of ​​the road surface to be maintained.

6. The asphalt pavement preventive maintenance technology and material determination method according to claim 1, characterized in that: The coating-type preventive and maintenance materials include any one of the following: organosilicon materials, emulsified asphalt materials, hot asphalt materials, or recycled asphalt materials.

7. The asphalt pavement prevention and maintenance technology and material determination method according to claim 1, characterized in that: The coating-type preventive and maintenance materials are made of organosilicon.

8. The asphalt pavement preventive maintenance technology and material determination method according to claim 1, characterized in that: In step S2, region T is a rectangle.

9. The asphalt pavement prevention and maintenance technology and material determination method according to claim 1, characterized in that: The road surface requiring preventive maintenance is asphalt concrete pavement, and there are no restrictions on the highway grade.

10. The asphalt pavement preventive maintenance technology and material determination method according to claim 1 or 3, characterized in that: The test method for structural depth is T0961-1995 or T0962-1995; the test method for permeability coefficient is T0971-2019.

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