Method for calculating asphalt film drop-off area ratio of asphalt pavement surface

Abstract

The application discloses a kind of asphalt pavement surface asphalt film shedding area proportion calculation method, it is related to asphalt shedding area calculation technical field, comprising: S1, randomly select fixed area as test sample from the asphalt pavement to be measured;S2, using far-infrared electric heat curtain to the selected area is uniformly heated, after heating setting time, uniform distribution of dye corn starch to selected area;S3, start blowing device, blow the dye corn starch on the surface of selected area, after blowing device is closed, asphalt pavement is not fallen asphalt film part is dyed corn starch full of now;S4, under natural light, photograph is carried out to the surface of selected area, using image processing software to calculate and process the picture obtained by photographing, and the dyeing area proportion is obtained, i.e. the asphalt film shedding area of the surface of selected area can be obtained.The application calculates the shedding condition of asphalt film on the surface of asphalt pavement by dyeing starch on the surface asphalt after heating without damaging the pavement, and the data obtained by calculation is reliable and accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of asphalt shedding area calculation, in particular to a method for calculating the asphalt film shedding area ratio of asphalt pavement surface. BACKGROUND

[0002] The structural strength of asphalt mixture is composed of the interlocking force between mineral aggregate particles, the adhesion between asphalt and mineral aggregate, and the cohesion of asphalt itself. The adhesion between asphalt and mineral aggregate is an important influencing factor for the water damage resistance of asphalt mixture. There is a phenomenon of asphalt aging during the mixing and compaction of asphalt mixture. The current specification in China only uses single means such as water boiling and water immersion for adhesion test, which cannot completely represent the actual road use process of asphalt pavement. The asphalt film shedding area of asphalt pavement surface is not determined by using asphalt and asphalt mixture under actual road use conditions, which has a large deviation from the actual engineering. Finally, the method uses human eye observation for judgment, which is not accurate in quantification. SUMMARY

[0003] The present application provides a method for calculating the asphalt film shedding area ratio of asphalt pavement surface in view of the needs and deficiencies of current technology development.

[0004] The technical solution adopted by the method for calculating the asphalt film shedding area ratio of asphalt pavement surface of the present application to solve the above technical problems is as follows:

[0005] The method for calculating the asphalt film shedding area ratio of asphalt pavement surface comprises the following steps:

[0006] S1. Selecting a fixed area as a test sample from the asphalt pavement to be tested at random;

[0007] S2. Uniformly heating the selected area by using a far-infrared electric heating curtain, and uniformly spreading dyed corn starch on the selected area after setting the heating time;

[0008] S3. Starting the air blowing device to blow the dyed corn starch on the surface of the selected area, and closing the air blowing device. At this time, the part of the asphalt film on the asphalt pavement that has not been shed is covered with dyed corn starch;

[0009] S4. Taking a photo of the surface of the selected area under natural light, and calculating and processing the obtained photo by using image processing software to obtain the dyed area ratio, i.e. the asphalt film shedding area of the selected area surface.

[0010] Optionally, step S1 selects a 50*50cm square area as a test sample from the asphalt pavement to be tested.

[0011] Further optional, the heating part of the far-infrared electric heating curtain has a size of 50*50 cm, and a power of 1000 W is adopted, and the heating mode is to be placed at a distance of 20 cm above the selected area.

[0012] Further optional, the far-infrared electric heating curtain continuously heats the selected area for 8-12 min.

[0013] Optionally, step S4 is performed, and the specific process of obtaining the dyeing area ratio by using the image processing software ImageJ to process the photographed picture is as follows:

[0014] S4.1, using the image processing software ImageJ to process the picture, the dyeing and non-dyeing parts are successfully separated;

[0015] S4.2, using the image processing software ImageJ to calculate the area ratio A of the dyeing part, and then calculating the asphalt pavement surface asphalt film shedding area ratio, the calculation formula is as follows:

[0016] P=1-A,

[0017] Wherein, P represents the asphalt pavement surface asphalt film shedding area ratio,

[0018] A represents the area ratio of the dyeing part.

[0019] Further optional, the calculated asphalt pavement surface asphalt film shedding area ratio P is corrected and calculated, and the calculation formula is as follows:

[0020] P C =P*k,

[0021] Wherein, P C is the corrected asphalt pavement surface asphalt film shedding area ratio,

[0022] k is the road surface temperature correction coefficient, and the infrared temperature measuring instrument is selected for temperature measurement,

[0023] When the road surface temperature is 0-15℃, k takes the value of 0.95, including the left and right side values,

[0024] When the road surface temperature is 15-30℃, k takes the value of 0.975, including the right side value,

[0025] When the road surface temperature is 30-45℃, k takes the value of 1, including the right side value,

[0026] When the road surface temperature is 45-60℃, k takes the value of 1.025, including the right side value,

[0027] When the road surface temperature is 60-75℃, k takes the value of 1.05, including the right side value.

[0028] Further optionally, the implementation process of step S4.1 is as follows:

[0029] S4.1.1, adopt the image processing software ImageJ, select the image button in the menu bar, click Type, click 8-bit, convert the picture into an 8-bit gray picture, and output;

[0030] S4.1.2, select the Image button in the menu bar, select Adjust, adjust the Threshold, and then drag the gray selection bar to select the gray value range, so that only the dyed part for calculating the area is left in the gray picture, and the separation degree of each dyed part is the highest.

[0031] Further optionally, the implementation process of step S4.2 is as follows:

[0032] S4.2.1, click the Analyze button in the task bar option in the image processing software ImageJ, pop up the SetMeasurements option box, check the required measurement parameters in the pop-up Set Measurements option box: check the required measurement parameters in the pop-up measurement parameter setting option box: the selected area area Area, the selected area average gray value Mean, the selected area integral optical density Integrated Density, the area fraction Area fraction, the average gray value Mean gray value, limited to threshold Limited to threshold, display the picture name Displaylabel, check OK after checking, output the proportion value of the asphalt dyed area of the asphalt pavement surface Area fraction, simply referred to as the area fraction A.

[0033] S4.2.2, after calculating the asphalt film shedding area proportion P of the asphalt pavement surface, based on the measured road surface temperature of the infrared temperature measuring instrument when the selected area road surface is photographed, the road surface temperature correction coefficient is selected, and the corrected asphalt film shedding area proportion P of the asphalt pavement surface is output. C .

[0034] The asphalt film shedding area proportion calculation method of the asphalt pavement surface of the present application has the beneficial effects compared with the prior art:

[0035] (1) The present application selects the actual used pavement as the test object, calculates the asphalt film shedding condition of the asphalt pavement surface by dyeing the heated surface asphalt with starch without damaging the pavement, the data is reliable and accurate, and does not affect the subsequent use of the pavement;

[0036] (2) The present application selects the actual used road surface as the test object, can select the road surface for operation at any time and anywhere, has feasibility and practical significance, in addition, the actual road surface needs to go through the use process of different climates and loads, compared with other simulation means for calculating the asphalt film shedding condition of the asphalt pavement surface, the calculation result is more close to the actual application. BRIEF DESCRIPTION OF DRAWINGS

[0037] FIG. 1 is a picture obtained by taking a picture of the surface of the selected area under natural light according to the embodiment one of the present application; Figure 1

[0038] FIG. 2 is a picture obtained after step S4.1.1 is performed according to the embodiment one of the present application; Figure 2

[0039] FIG. 3 is a picture obtained after step S4.1.2 is performed according to the embodiment one of the present application. Figure 3 DETAILED DESCRIPTION

[0040] In order to make the technical scheme, the solved technical problems and the technical effects of the present application more clear, the technical scheme of the present application is described clearly and completely in combination with specific embodiments.

[0041] Embodiment one:

[0042] In combination with FIGS. 1, 2 and 3, the embodiment proposes a calculation method for the asphalt film shedding area ratio of the asphalt pavement surface, which comprises the following steps: Figure 1 2 In combination with FIGS. 1, 2 and 3, the embodiment proposes a calculation method for the asphalt film shedding area ratio of the asphalt pavement surface, which comprises the following steps:

[0043] S1, randomly selecting a fixed area from the asphalt pavement to be measured as a test sample.

[0044] S2, uniformly heating the selected area by using a far-infrared electric heating curtain, and uniformly scattering dyed corn starch on the selected area after the heating setting time.

[0045] For steps S1 and S2, the selected fixed area is a square area of 50*50cm, in order to realize the uniform heating of the selected area, the heating part of the far-infrared electric heating curtain is 50*50cm in size, the far-infrared electric heating curtain has a power of 1000W, and the heating mode is as follows: the heating part of the far-infrared electric heating curtain is placed 20cm above the selected area; the heating setting time is: 8min-12min of continuous heating, and 10min of continuous heating is the best.

[0046] S3, starting the blowing device to blow the dyed corn starch on the surface of the selected area, and after the blowing device is turned off, the part of the asphalt pavement without shedding asphalt film is covered with dyed corn starch.

[0047] ​​​​S4, under natural light, the surface of the selected area is photographed, and the image processing software ImageJ is used to calculate and process the photographed picture to obtain the staining area ratio, that is, the asphalt film shedding area of the selected area surface, which specifically includes:

[0048] S4.1, using image processing software ImageJ, the picture is processed by gray scale, and the dyed and non-dyed parts are successfully separated, and the operation is as follows:

[0049] S4.1.1, using image processing software ImageJ, selecting the image button in the menu bar, clicking Type, and clicking 8-bit, the picture is converted into an 8-bit gray scale picture, and outputted;

[0050] S4.1.2, select the Image button in the menu bar, select Adjust, adjust Threshold, then drag the gray scale selection bar, select the gray scale value range, so that only the dyed part for calculating the area is left in the gray scale picture, and the separation degree of each dyed part is the highest.

[0051] S4.2, first, the area ratio A of the dyed part is calculated by using image processing software ImageJ, and the specific operation is as follows:

[0052] Click the Analyze button in the taskbar option in the image processing software ImageJ, a SetMeasurements option box will pop up, check the measurement parameters needed in the pop-up Set Measurements option box: Area, Mean, Integrated Density, Area fraction, Mean gray value, Limited to threshold, Display label, check OK after checking, that is, the output asphalt pavement surface asphalt dyeing area ratio Areafraction, simply referred to as area ratio A;

[0053] Then calculate the asphalt pavement surface asphalt film shedding area ratio, because the newly constructed asphalt mixture pavement asphalt is all wrapped on the stone, so the unused asphalt pavement asphalt film area ratio is 100%, that is, 1, so the calculation formula is as follows:

[0054] P=1-A,

[0055] Wherein, P represents the asphalt pavement surface asphalt film shedding area ratio, A represents the area ratio of the dyed part;

[0056] Finally, based on the measured road surface temperature of the infrared temperature measuring instrument when the selected area pavement is photographed, the road surface temperature correction coefficient is selected, and the corrected asphalt pavement surface asphalt film shedding area ratio P is outputtedC .

[0057] Need to supplement, Image represents image, Type represents type, Adjust represents adjustment, Threshold represents threshold, Area represents the area of the framed area, Mean represents the average gray value of the framed area, IntDen (Integrated Density) represents the integrated optical density of the framed area, Area fraction represents the area ratio, Mean gray value represents the average gray value, Limited to threshold represents limited to the set threshold, Display label represents the display picture name.

[0058] The calculated asphalt pavement surface asphalt film shedding area ratio P is corrected, and the calculation formula is as follows:

[0059] P C =P*k,

[0060] Wherein, P C is the corrected asphalt pavement surface asphalt film shedding area ratio,

[0061] k is the road surface temperature correction coefficient, and the infrared temperature measuring instrument is selected for temperature measurement,

[0062] When the road surface temperature is 0-15 DEG C, the value of k is 0.95, and the left and right side end values are included,

[0063] When the road surface temperature is 15-30 DEG C, the value of k is 0.975, and the right side end value is included,

[0064] When the road surface temperature is 30-45 DEG C, the value of k is 1, and the right side end value is included,

[0065] When the road surface temperature is 45-60 DEG C, the value of k is 1.025, and the right side end value is included,

[0066] When the road surface temperature is 60-75 DEG C, the value of k is 1.05, and the right side end value is included.

[0067] Need to supplement, the blowing device blows the dyed corn starch on the surface of the selected area at room temperature, and the final calculation result is most consistent with the actual situation. Room temperature is usually 20 DEG C.

[0068] As can be seen from the above, the asphalt pavement surface asphalt film shedding area ratio calculation method of the application selects the actual used pavement as the test object, calculates the asphalt pavement surface asphalt film shedding condition by dyeing the heated surface asphalt with starch without damaging the pavement, the data is reliable and accurate, and does not affect the subsequent use of the pavement.

[0069] The principles and implementation manners of the present application are described in detail by using the above specific examples, and the examples are only used to help understand the core technical content of the present application. Based on the above specific examples of the present application, any improvement and modification of the present application made by the person skilled in the art without departing from the principles of the present application shall fall within the patent protection scope of the present application.

Claims

1. A method of calculating the proportion of the area of a surface asphalt film of an asphalt pavement that has been removed, characterized by , comprising the following steps: S1, randomly select a fixed area from the asphalt pavement to be tested as a test sample; S2, uniformly heat the selected area with a far-infrared electric heating curtain, after the heating is set for a period of time, uniformly sprinkle dyed corn starch on the selected area; S3, start the air blowing device to blow the dyed corn starch on the surface of the selected area, and after the air blowing device is turned off, the part of the asphalt pavement where the asphalt film has not fallen off is covered with dyed corn starch; S4, take a photo of the surface of the selected area under natural light, and calculate and process the obtained picture by using image processing software to obtain the area ratio of dyeing, that is, the asphalt film falling area of the surface of the selected area.

2. The method of claim 1, wherein the method is characterized by: Step S1 selects a 50*50cm square area from the asphalt pavement to be tested as a test sample.

3. The method of claim 2, wherein the method is characterized by: The heating part of the far-infrared electric heating curtain has a size of 50*50cm, and the power used is 1000W. The heating method is to place the heating part 20cm above the selected area.

4. The method of claim 3, wherein the method is characterized by: The far-infrared electric heating curtain continuously heats the selected area for 8-12 minutes.

5. The method of claim 1-4, wherein, The specific process of calculating and processing the obtained picture by using image processing software ImageJ in step S4 is as follows: S4.1, use image processing software ImageJ to perform gray scale processing on the picture to successfully separate the dyed and non-dyed parts; S4.2, use image processing software ImageJ to calculate the area ratio A of the dyed part, and then calculate the asphalt film falling area ratio of the asphalt pavement surface, the calculation formula is as follows: P=1-A, Wherein, P represents the asphalt film falling area ratio of the asphalt pavement surface, A represents the area ratio of the dyed part.

6. The method for calculating the proportion of asphalt film peeling off the surface of an asphalt pavement according to claim 5, characterized in that, The calculated asphalt film falling area ratio P of the asphalt pavement surface is corrected and calculated, and the calculation formula is as follows: P C = P * k, wherein P C is the corrected asphalt pavement surface asphalt film loss area ratio, k is the road surface temperature correction coefficient, and an infrared thermometer is used for temperature measurement, When the road surface temperature is 0-15℃, k takes the value of 0.95, including the left and right side values, When the road surface temperature is 15-30℃, k takes the value of 0.975, including the right side value, When the road surface temperature is 30-45℃, k takes the value of 1, including the right side value, When the road surface temperature is 45-60℃, k takes the value of 1.025, including the right side value, When the road surface temperature is 60-75℃, k takes the value of 1.05, including the right side value.

7. The method of claim 6, wherein the method is characterized by: The implementation process of step S4.1 is as follows: S4.1.1, use image processing software ImageJ, select the Image button in the menu bar, click Type, click 8-bit, convert the picture to an 8-bit gray scale picture, and output; S4.1.2, select the Image button in the menu bar, select Adjust, adjust the Threshold, and then drag the gray scale selection bar to select the gray scale value range, so that only the dyed part used for area calculation remains in the gray scale picture, and the separation degree of each dyed part is the highest.

8. The method of claim 7, wherein the method is characterized by: The implementation process of step S4.2 is as follows: S4.2.1, click the Analyze button in the taskbar options in the image processing software ImageJ, and a SetMeasurements option box will pop up. In the pop-up Set Measurements option box, check the measurement parameters needed: In the pop-up measurement parameter setting option box, check the measurement parameters needed: the selected area area Area, the selected area average gray value Mean, the selected area integral optical density Integrated Density, the area fraction Area fraction, the average gray value Mean gray value, limited to threshold Limited to threshold, display picture name Displaylabel, and click OK after checking to output the proportion value of the asphalt pavement surface asphalt staining area, which is simply referred to as the area fraction A; S4.2.2, after calculating the asphalt pavement surface asphalt film shedding area ratio P, based on the measured road surface temperature of the infrared temperature measuring instrument when the selected area road surface is photographed, selecting the road surface temperature correction coefficient, outputting the corrected asphalt pavement surface asphalt film shedding area ratio P C .

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