A method for designing the dosage of a coating type preventive maintenance material

Abstract

The present application relates to the field of road maintenance engineering, in particular to a coating type preventive maintenance material dosage design method, the present application considers the water permeability coefficient index, designs the lower limit value of the coating type preventive maintenance material dosage, can guarantee the functional requirement of the application of the coating type preventive maintenance material, effectively closes the pavement void, prevents water from entering, improves the water damage resistance of the pavement; considering the structure depth index, the upper limit value of the coating type preventive maintenance material dosage is designed, which can guarantee the driving safety after the application of the coating type preventive maintenance material, guarantee that the pavement has the required structure depth, can discharge the road surface water in time, and ensure the driving safety of the pavement.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of road maintenance engineering, in particular, the present application relates to a coating type preventive maintenance material dosage design method. BACKGROUND

[0002] The coating type preventive maintenance technology is to spray the coating type preventive maintenance material on the road surface, and a thin film can be formed after solidification, which reduces the water permeability coefficient of the pavement and achieves the purpose of improving the water damage resistance, and can also inhibit the looseness. The coating type preventive maintenance material is commonly used for preventive maintenance of asphalt pavement and reinforcement of water permeable areas of newly built asphalt pavement. The effect of the coating type preventive maintenance material on improving water permeability can be analyzed from two aspects:

[0003] (1) The coating type preventive maintenance material penetrates into the asphalt surface layer, blocks the internal voids, and prevents water from penetrating, so that the void water pressure cannot be generated.

[0004] (2) The coating type preventive maintenance material adheres to the asphalt surface to form a film, and due to the excellent hydrophobic property of the coating type preventive maintenance material, the erosion of void water to asphalt can be greatly delayed.

[0005] The coating type preventive maintenance material can effectively reduce the water permeability coefficient of the pavement and improve the water resistance of the pavement, but after spraying, it will also cause the attenuation of the macro surface structure depth of the pavement. Good structure depth can effectively drain the water accumulated between the wheels and the road surface in rainy days, thereby improving the friction coefficient to ensure driving safety. Therefore, the water permeability coefficient and the structure depth are two indexes that need to be considered in the application process of the coating type preventive maintenance material, one represents the functional effect of the material application, and the other represents the driving safety: if the dosage of the coating type preventive maintenance material is too small, the effect of reducing the water permeability coefficient of the pavement cannot be achieved, and if the dosage is too large, the structure depth of the pavement will be excessively reduced, which will affect the driving safety.

[0006] However, the existing technology does not consider the two indexes of water permeability coefficient and structure depth when determining the dosage of the coating type preventive maintenance material, and more relies on experience. Therefore, how to reasonably design the dosage of the coating type preventive maintenance material according to the actual situation of the pavement is the common demand of realizing the functional effect of the material and the driving safety, while considering the economy. SUMMARY

[0007] The purpose of the present application is to provide a coating type preventive maintenance material dosage design method to solve the problem that the functional effect of the coating type preventive maintenance material and the driving safety cannot be effectively coordinated due to the lack of scientific spreading amount design method in the prior art.

[0008] The technical problem to be solved by the present application is solved by the following technical scheme: a coating type preventive maintenance material dosage design method, comprising the following steps:

[0009] S1. determining a pavement meeting the coating type preventive maintenance;

[0010] S2. selecting a representative area T on the pavement to be preventive maintained;

[0011] S3. uniformly spreading the coating type preventive maintenance material in the area T, with a mass of an initial estimated material dosage M0;

[0012] S4. testing the texture depth TD1 of the area T after the coating type preventive maintenance material is completely cured into a film;

[0013] when TD1 >= TD 下限 , step S5 is performed;

[0014] when TD1 < TD 下限 , the dosage of the coating type preventive maintenance material in step S3 is reduced and S4 is repeated until the dosage of the coating type preventive maintenance material meets the requirement of TD1 >= TD 下限 , and then step S5 is performed;

[0015] S5. testing the water permeability coefficient K1 of the area T;

[0016] when K1 <= K 上限 , step S6 is performed;

[0017] when K1 > K 上限 , the dosage of the coating type preventive maintenance material in step S3 is increased and S4 and S5 are repeated until the dosage of the coating type preventive maintenance material meets the requirements of TD1 >= TD 下限 and K1 <= K 上限 , and then step S6 is performed, or the dosage 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, indicating that the coating type preventive maintenance material is not suitable for the preventive maintenance of the pavement to be maintained;

[0018] S6. determining the dosage M of the coating type preventive maintenance material for the pavement to be maintained;

[0019] TD 下限 and K 上限 in the above steps are preset values.

[0020] The technical scheme of the present application further comprises: in step S5, when the coating type preventive maintenance material cannot meet the requirements of TD1 >= TD 下限 and K1 <= K 上限When the requirements of the coating type preventive maintenance material are changed, the type of the coating preventive maintenance material is changed, the penetration capacity and the film thickness index are mainly adjusted when the material is changed, the coating preventive maintenance material with stronger penetration capacity and greater film thickness is selected, and steps S3-S5 are repeated.

[0021] The technical scheme of the present application further has: the determination method of the road surface meeting the coating preventive maintenance in step 1 is: detecting the texture depth TD0 and the water permeability coefficient K0 of the road surface to be maintained;

[0022] When TD0≥TD 下限 , step S2 is executed;

[0023] When TD0<TD 下限 , the road surface to be maintained is not suitable for the coating preventive maintenance, and other preventive maintenance technologies can be selected, for example, the seal coat preventive maintenance technology is selected to improve the road surface skid resistance.

[0024] The technical scheme of the present application further has: the calculation formula of the initial estimated material amount M0 in step S3 is as follows:

[0025] M0=μ*S*TD0*ρ / 4000

[0026] In the formula, M0 is the initial estimated material amount, the unit is kg / m 2 ;

[0027] μ is a calculation coefficient, the value range is 0-1, and is related to the water permeability coefficient K0 of the region T, and the greater K0 is, the greater μ is;

[0028] S is the area of the region T, the unit is m 2 ;

[0029] TD0 is the texture depth of the region T, the unit is mm;

[0030] ρ is the density of the coating preventive maintenance material, the unit is kg / m 3 . In the prior art, the amount of the coating preventive maintenance material is directly determined according to experience, and the influence of the differences of different road surface texture depths and water permeability coefficients on the initial estimated material is not considered, the formula of the initial estimated material amount is provided in the present application, the initial material amount is estimated according to the principle that the coating preventive maintenance material can fill a certain texture depth of the road surface after being penetrated and solidified, and the material amount is optimized and adjusted through the water permeation index and the texture depth index, so that the functionality, safety and economy can be effectively considered.

[0031] The technical scheme of the present application further has: the material amount M of the coating preventive maintenance of the road surface to be maintained in step S6 is the amount of the region T, so that the material amount of the coating preventive maintenance per unit area of the road surface to be maintained is obtained.

[0032] The technical scheme of the present application also has: the coating type preventive maintenance material includes but is not limited to any one of organic silicon material, emulsified asphalt material, hot asphalt material or asphalt regeneration material.

[0033] The technical scheme of the present application also has: the coating type preventive maintenance material is selected from organic silicon material. The organic silicon maintenance material and its application is a new type of coating type preventive maintenance technology. The organic silicon maintenance material is sprayed on the road surface, and a colorless and transparent film can be formed after curing, which can reduce the water permeability coefficient of the road surface and improve the water damage resistance. And can inhibit loose. As a coating type preventive maintenance material, organic silicon maintenance material is commonly used for preventive maintenance of asphalt pavement and reinforcement of water permeable areas of newly built asphalt pavement.

[0034] The technical scheme of the present application also has: the area T in step S2 is rectangular. The area T is set to be rectangular, which is convenient for calculating the area of the area T.

[0035] The technical scheme of the present application also has: the road surface to be prevented and maintained is an asphalt concrete pavement, a cement concrete pavement or other pavements. The pavement texture depth is an index representing the roughness of the pavement. According to different highway grades and annual rainfall, the TD value of the present application is determined. 下限

[0036] The technical scheme of the present application also has: the test method of the texture depth is T0961-1995 or T0962-1995; and the test method of the water permeability coefficient is T0971-2019. The test method of the texture depth and the test method of the water permeability coefficient are both mature test methods in the existing technical system, which can effectively ensure the accuracy of the results of the present application method and is beneficial to popularization.

[0037] Compared with the prior art, the present application has the following advantages:

[0038] The present application considers the water permeability coefficient index to design the lower limit value of the amount of coating type preventive maintenance material, which can guarantee the functional requirements of the application of coating type preventive maintenance material, effectively seal the voids of the road surface, prevent water from entering, and improve the water damage resistance of the road surface. Considering the texture depth index, the upper limit value of the amount of coating type preventive maintenance material is designed, which can guarantee the driving safety after the application of the coating type preventive maintenance material, ensure that the road surface has a texture depth that meets the requirements, and can drain the accumulated water on the road surface in time to ensure the driving safety of the road surface. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The flowchart of the coating type preventive maintenance material amount design method of the present application is shown. DETAILED DESCRIPTION

[0040] The present application will be further described below with reference to the embodiments.​

[0041] In this embodiment, the preventive maintenance material for the coating is an organosilicon material, which includes a silicone resin solution, a penetrant, and a tackifier, with a density ρ of 650–950 kg / m³. 3 The Brinell viscosity at 25℃ is 20–30 mPa·s, the bond strength at 25℃ is ≥0.3 MPa, and the impermeability pressure is ≥1.0 MPa. The test method for the bond strength of organosilicon curing materials is GB / T16777-1997; the test method for the impermeability pressure is JC / T 894-2001.

[0042] The pavement requiring preventative maintenance is asphalt concrete pavement, TD 下限 It is 0.55mm, K 上限 It is 80 ml / min. The higher the highway grade, the better. 上限 The lower the concentration, the better. 80ml / min is the requirement for highways and first-class roads.

[0043] like Figure 1 As shown, a method for designing the dosage of a coating-type preventive maintenance material is presented. In the figure, "N" indicates "not meeting the judgment criteria" and "Y" indicates "meeting the judgment criteria". The method includes the following steps:

[0044] S1. Determine the road surface that meets the requirements for preventive maintenance using coatings.

[0045] S2. Select a representative area T on the road surface to be preventively maintained.

[0046] S3. Apply a coating-type preventative maintenance material evenly within area T, with a mass equal to the initial estimated material usage M0.

[0047] S4. The preventive maintenance material to be coated is completely cured into a film, and the test area T has a structural depth TD1.

[0048] When TD1≥TD 下限 At that time, proceed to step S5.

[0049] When TD1 < TD 下限 If the amount of coating-type preventive maintenance material in step S3 is reduced, and step S4 is repeated until the amount of coating-type preventive maintenance material can meet the requirement that TD1 ≥ TD. 下限 After meeting the requirements, proceed to step S5.

[0050] S5. Test the permeability coefficient K1 in area T.

[0051] When K1≤K 上限 At that time, proceed to step S6.

[0052] When K1>K 上限If not, increase the amount of coating type preventive maintenance material in step S3 and repeat S4 and 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, or the amount of coating type preventive maintenance material cannot meet the requirements of TD1≥TD 下限 and K1≤K 上限 , which indicates that the road to be maintained is not suitable for coating type preventive maintenance using silicone materials.

[0053] In step S5, when the coating type preventive maintenance material cannot meet the requirements of TD1≥TD 下限 and K1≤K 上限 at the same time, replace the type of coating type preventive maintenance material, and mainly adjust the penetration ability and film thickness index when replacing the material. Select a coating type preventive maintenance material with stronger penetration ability and greater film thickness, and repeat steps S3-S5 to select the appropriate type and amount of coating type preventive maintenance material, and ensure that the effect of coating type preventive maintenance reaches the design purpose.

[0054] S6. Determine the amount M of coating type preventive maintenance material for the road to be maintained.

[0055] TD 下限 and K 上限 in the above steps are preset values, i.e., TD 下限 is 0.55 mm, and K 上限 is 80 ml / min.

[0056] The determination method of the road surface that meets the coating type 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.

[0057] When TD0≥TD 下限 , execute step S2.

[0058] The calculation formula of the initial estimated material amount M0 in step S3 is as follows:

[0059] M0=μ*S*TD0*ρ / 4000

[0060] In the formula, M0 is the initial estimated material amount, and the unit is kg / m 2 ;

[0061] μ is a calculation coefficient, and the value range is 0-1, which is related to the water permeability coefficient K0 of the region T. The larger K0 is, the larger μ is.

[0062] Table 1 μ recommended value

[0063]

[0064] S is the area of region T, in m 2 Region T in step S2 is a square region with an area of 500 mm*500 mm.

[0065] TD0 is the construction depth of region T, in mm.

[0066] p is the density of the coating type preventive maintenance material, in kg / m 3 .

[0067] The amount M of the coating type preventive maintenance material to be applied to the road surface to be maintained in step S6 is the amount for region T, thereby obtaining the amount of the coating type preventive maintenance material per unit area of the road surface to be maintained. Each time the amount M or type of the coating type preventive maintenance material to be applied to the road surface to be maintained is adjusted, a new region T is selected for application.

Claims

1. A method for designing the dosage of a coating-type preventative maintenance material, characterized in that, Includes the following steps: S1. Identify road surfaces that meet the requirements for preventative maintenance using coatings; S2. Select a representative area T on the road surface to be preventively maintained; S3. Apply a coating-type preventive maintenance material evenly within area T, with a mass equal to the initial estimated material usage M0; S4. The preventive maintenance material to be coated is completely cured into a film, and 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 maintenance material in step S3 is reduced, and step S4 is repeated until the amount of coating-type preventive maintenance material can meet the requirement that 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 dosage of the coating-type preventive maintenance material in step S3 is increased, and steps S4 and S5 are repeated until the dosage of the coating-type preventive maintenance material can meet the requirement that TD1 ≥ TD. 下限 and K1≤K 上限 If the requirements for step S6 are not met, or if the amount of the coating-type preventive maintenance material cannot simultaneously satisfy TD1 ≥ TD, then the procedure S6 will be performed. 下限 and K1≤K 上限 The requirements indicate that this type of preventive maintenance material is not suitable for preventive maintenance of the road surface to be maintained; S6. Determine the dosage M of preventive maintenance materials (coatings) for the road surface to be maintained; TD in the above steps 下限 and K 上限 This is the default value.

2. The method for designing the dosage of coating-type preventive maintenance materials according to claim 1, characterized in that: In step S5, when the coating-type preventive maintenance material cannot simultaneously satisfy TD1≥TD 下限 and K1≤K 上限 When required, change the type of coating-type preventive and maintenance material. When changing the material, adjust the penetration capacity and film thickness indicators, and repeat steps S3-S5.

3. The method for designing the dosage of coating-type preventive maintenance materials according to claim 1, characterized in that, The method for determining the pavement that meets the requirements for preventive maintenance of coating type 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, preventative maintenance using coatings is not suitable for the road surface requiring maintenance.

4. The method for designing the dosage of coating-type preventive maintenance materials 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 the coating-type preventative maintenance material, expressed in kg / m³. 3 .

5. The method for designing the dosage of coating-type preventive maintenance materials according to claim 1, characterized in that: In step S6, the amount M of the preventive maintenance material coating for the road surface to be maintained is the amount of the coating material in area T, thus obtaining the amount of preventive maintenance material coating per unit area of ​​the road surface to be maintained.

6. The method for designing the dosage of coating-type preventive maintenance materials according to claim 1, characterized in that: The coating-type preventive maintenance materials include, but are not limited to, any one of the following: silicone materials, emulsified asphalt materials, hot asphalt materials, or recycled asphalt materials.

7. The method for designing the dosage of coating-type preventive maintenance materials according to claim 1, characterized in that: The coating-type preventive maintenance material is made of organosilicon.

8. The method for designing the dosage of coating-type preventive maintenance materials according to claim 1, characterized in that, In step S2, region T is a rectangle.

9. The method for designing the dosage of coating-type preventive maintenance materials according to claim 1, characterized in that: The pavement requiring preventive maintenance is asphalt concrete pavement, cement concrete pavement, or other pavement.

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