CN111366500B - Method for detecting mixing amount of surface active warm mixing agent in asphalt - Google Patents
Method for detecting mixing amount of surface active warm mixing agent in asphalt Download PDFInfo
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- 238000002156 mixing Methods 0.000 title claims abstract description 91
- 239000010426 asphalt Substances 0.000 title claims abstract description 81
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 45
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000012360 testing method Methods 0.000 claims abstract description 36
- 238000011088 calibration curve Methods 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 66
- 238000004140 cleaning Methods 0.000 claims description 12
- 230000000630 rising effect Effects 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 8
- 230000005251 gamma ray Effects 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 31
- 238000011960 computer-aided design Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 5
- 239000004094 surface-active agent Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
- G01N2013/0208—Investigating surface tension of liquids by measuring contact angle
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
- G01N2013/0275—Investigating surface tension of liquids involving surface-active agents
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/02—Investigating surface tension of liquids
- G01N2013/0283—Investigating surface tension of liquids methods of calculating surface tension
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Abstract
The invention discloses a method for detecting the mixing amount of a surface active warm-mixing agent in asphalt. Firstly, the inner radius of the capillary tube to be measured is calibrated by using absolute ethyl alcohol and the capillary tube with the known inner radius. Secondly, obtaining calculated values of the surface tension of the warm-mixed asphalt under different surface activity warm-mixed agent doping amounts by a differential capillary method, and fitting a relation curve of the warm-mixed agent doping amounts and the corresponding calculated values of the surface tension to obtain a calibration curve. And finally, measuring a calculated value of the surface tension of the warm-mix asphalt to be measured, and comparing with a calibration curve to obtain the mixing amount of the warm-mix agent. The method is simple to operate, stable in test result, capable of accurately detecting the doping amount of the surface active warm-mixing agent and good in popularization value.
Description
Technical Field
The invention belongs to the field of road engineering, and relates to a method for detecting the mixing amount of a surface active warm-mixing agent in asphalt.
Background
In recent years, with the increase of environmental awareness, the application of warm mix asphalt is gradually expanded. Compared with the hot-mix asphalt mixture, the warm-mix asphalt mixture has lower mixing temperature and rolling temperature, relatively less energy consumption and exhaust emission, and is a novel energy-saving environment-friendly road material with wide application prospect and adaptation to the development of the times. The main additive of the surface active warm mixing technology is a road surfactant, and the action principle of the road surfactant is to form a layer of lubricating film between asphalt and water molecules, so that the effect of reducing the construction temperature is achieved. Compared with other warm mixing technologies, the surface active warm mixing technology can not only obviously enhance the infiltration performance of asphalt on aggregate and change the compaction characteristic, but also does not change the viscosity of asphalt materials. The invention only detects the mixing amount of the warm-mixing agent in the surface active warm-mixed asphalt.
The mixing amount of the warm-mixing agent in the surface active warm-mixed asphalt has not been a definite testing method all the time, so that the surface active warm-mixed asphalt cannot be detected in the construction process, and further the expected cooling effect which can be achieved in the construction cannot be ensured. The mixing amount of the warm-mix agent can be detected by utilizing the rotary viscosity change amplitude of the surface active warm-mix asphalt mortar, but due to the difference of the types of the mineral powder and the compatibility of the mineral powder and the warm-mix asphalt, the viscosity of the asphalt mortar can not change obviously after some surface active warm-mix agent is added, so that the method has no universality. For some surface active warm mix asphalt, the influence of the change of the dosage of the warm mix agent on the rheological performance is not large, and a modulus and frequency relation graph obtained by a frequency scanning test may not have a mutation point and is not suitable for detecting the dosage of the surface active warm mix agent. Therefore, a simple, accurate and effective detection method is needed, and a specific scheme is provided for detecting the content of the warm-mixing agent in the surface active warm-mixed asphalt.
In view of the fact that the surface active warm-mix agent achieves the effect of reducing the construction temperature by changing the surface physicochemical property of the asphalt, the invention provides a method for determining the surface active warm-mix agent mixing amount of the asphalt to be detected by taking the surface tension of the asphalt as a detection index of the surface active warm-mix agent mixing amount and detecting the surface tension calculation value of the warm-mix asphalt under the condition of different surface active warm-mix agent mixing amounts. The detection index has obvious correlation with the surface active warm mixing agent.
Disclosure of Invention
The invention aims to provide a method for detecting the mixing amount of a surface active warm-mixing agent in asphalt, which can be used for obtaining the mixing amount of the warm-mixing agent in the surface active warm-mixing asphalt by comparing according to a calibration curve of the mixing amount of the surface active warm-mixing agent and a calculated value corresponding to surface tension.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for detecting the mixing amount of a surface active warm mixing agent in asphalt is characterized by comprising the following steps:
step one, selecting 3 groups of homogeneous different-diameter capillaries, wherein the inner radius of the capillaries of the group 1 and the group 2 is within the range of 0.08-0.25 mm, the inner radius of the capillaries of the group 3 is within the range of 0.7-1.2 mm, and the ratio of the larger inner radius to the smaller inner radius of any two groups of capillaries is not less than 1.6;
step two, cleaning and drying the capillary tubes, immersing the capillary tubes into absolute ethyl alcohol at room temperature in a non-ventilated environment until liquid in the capillary tubes rises stably, and screening out capillary tubes with the same liquid level height in the capillary tubes for a parallel test;
step three, shooting and recording the cross section of the capillary tube of the group 3 by using a camera, and determining the inner radius r of the capillary tube 3 ；
Step four, cleaning and drying the capillary tubes, vertically placing 3 groups of capillary tubes in absolute ethyl alcohol in a room temperature and non-ventilated environment until liquid in the capillary tubes rises stably, shooting and recording the maximum height h of the liquid in the capillary tubes rising on the same horizontal plane 1 ～h 3 The concave liquid level in the capillary tube is recorded, the test temperature is recorded, and the contact angle theta between the liquid and the tube wall is obtained after the concave liquid level is fitted to be of a spherical crown shape 1 ～θ 3 ；
Step five, according to the inner radius r of the third group of capillaries 3 Height h of liquid level 1 ～h 3 Angle of contact theta of concave liquid surface 1 ～θ 3 Surface tension of absolute ethyl alcohol gamma e Density of absolute ethanol rho e Respectively calculating the inner radius r of the capillary tubes of the 1 st group and the 2 nd group by using formula 1 of a differential capillary tube method 1 、r 2 ；
Equation 1:
in the formula: gamma ray e Is the surface tension of absolute ethyl alcohol at the test temperature, and the unit is dyn/cm; rho e The density of the absolute ethanol at the test temperature is given in g/cm 3 (ii) a Ag is the local acceleration of gravity, in N/kg; i is serial number of capillary groups with different inner radiuses, i is 1, 2; h is a total of i 、h 3 The maximum rising height of the upper edge of the absolute ethyl alcohol concave liquid surface in the capillary tubes with different inner radius groups on the same horizontal plane is in mm; r is i 、r 3 The inner radius of the capillary tube is different from the inner radiusIn mm; theta i 、θ 3 Fitting the inner concave liquid surfaces of the capillaries with different inner radius groups into a contact angle behind a spherical crown shape;
step six, cleaning and drying the capillary tubes, vertically placing the capillary tubes of the group 1 and the group 2 in high-temperature liquid asphalt to be tested, keeping the temperature for a period of time at constant temperature until the asphalt in the capillary tubes does not rise any more, immediately shooting and recording the height values of the asphalt in the two groups of capillary tubes on the same horizontal plane after the asphalt rises stably after the constant temperature is finished, and obtaining the calculated value of the surface tension of the high-temperature liquid asphalt by utilizing a formula 2 of a differential capillary tube method;
equation 2:
in the formula: gamma ray a The calculated value of the surface tension of the asphalt at the test temperature is dyn/cm; rho a The density of the asphalt at the test temperature is given in g/cm 3 (ii) a Ag is the local acceleration of gravity, in N/kg; h 1 、H 2 The maximum rising height of the upper edges of the asphalt concave liquid surfaces in two groups of capillary tubes below the same horizontal plane is in mm; r is 1 、r 2 The radius of the two groups of capillaries is in mm;
step seven, repeating the step six, and measuring the calculated surface tension gamma of the warm-mixed asphalt under different surface activity warm-mixed agent mixing amounts a ；
Step eight, calculating a value gamma by using the surface tension of the surface active warm mix asphalt a Taking the horizontal coordinate as well as the vertical coordinate of the corresponding mixing amount w of the warm-mixing agent, drawing a fitting curve by adopting a least square method, and taking the curve as a calibration curve of the mixing amount of the warm-mixing agent at a calibration temperature;
and step nine, repeating the step six, measuring a calculated surface tension value of the surface active warm-mixed asphalt to be measured at the calibration temperature, comparing a calibration curve of the mixing amount of the warm-mixed agent at the calibration temperature, and determining the mixing amount of the warm-mixed agent.
Preferably, in the second step, the fourth step and the sixth step, the step of cleaning the capillary is to clean the capillary by using ultrasonic waves and absolute ethyl alcohol as a cleaning solution.
Preferably, in the second step and the fourth step, the rising height of the absolute ethyl alcohol is determined by a compensation method, namely after the liquid level in the capillary stops rising, the liquid level height of the absolute ethyl alcohol outside the capillary is slowly reduced until the liquid in the capillary of 3 groups of capillaries all falls down, and then the liquid level in the capillary is stopped waiting to be stable.
Preferably, in step three, the inner radius r of the capillary tube in the 3 rd group 3 The image is obtained after shooting and imaging through a Charge Coupled Device (CCD) camera.
Preferably, in step four and step six, the liquid level size of the experimental test should be larger than the rectangular size of 100mm x 50mm, and the capillary should be at the position of the center line of the liquid level parallel to the long side.
Preferably, in step four, the absolute ethanol differential test should be completed within 10 minutes.
Preferably, in step four, the contact angle θ 1 ～θ 3 And shooting and imaging through a CCD camera, and fitting the concave liquid level in the capillary into a spherical crown shape by using Computer Aided Design (CAD) software to obtain the capillary liquid level.
Preferably, in step five, γ e Obtained by the relation of absolute ethyl alcohol surface tension and temperature, rho e And obtaining the product through an absolute ethyl alcohol density meter.
Preferably, in the sixth step, the asphalt testing temperature is within the range of 135-185 ℃.
Preferably, in the sixth step, the constant temperature time of the asphalt is between 5 and 8 hours.
Preferably, in the sixth step, the height value with higher liquid level rise is selected as effective data, the number of the effective data of each group of capillaries is not less than 3, and the variation coefficient is not more than 0.03.
Preferably, the data used for fitting the curve in the step eight is not less than 3, and the doping amount to be measured is ensured to be between the maximum warm-mixing agent doping amount and the minimum warm-mixing agent doping amount of the fitting curve, and the doping amount to be measured is interpolated from the curve and cannot be obtained by using a curve extension means.
The invention has the advantages that:
1. the steps and the method adopted by the invention are simple, the operability is strong, special equipment is not needed, the test cost is low, and the realization is easy;
2. the surface tension is used as the testing index of the mixing amount of the warm-mixing agent, so that the sensitivity is stronger and the universality is realized;
3. according to the invention, the differential capillary method is improved, so that the testing precision of the surface tension value is improved, and the obtained result is more accurate and stable.
Drawings
FIG. 1 is a flow chart illustrating the steps of the method for detecting the amount of surface active warm-mix agent in asphalt.
FIG. 2 is a schematic diagram showing a contact angle between liquid and a pipe wall when the concave liquid level of anhydrous ethanol in a capillary is in a spherical crown shape according to the method for detecting the doping amount of the surface active warm-mixing agent in asphalt.
FIG. 3 is a surface tension calculated value-surface active warm-mix agent mixing amount calibration curve of No. 70 surface active warm-mix asphalt (135 ℃) in the method for detecting the mixing amount of the surface active warm-mix agent in asphalt according to the present invention.
Detailed Description
As shown in the testing procedure of asphalt surface tension and wettability parameters in FIG. 1, warm mix asphalt No. 70 with different surfactant mixing amounts was used for testing, which is further detailed:
step one, selecting 3 groups of homogeneous reducing capillaries, wherein the production labels of the inner radiuses of the 1 st group and the 2 nd group are 0.10mm and 0.20mm, and the production label of the inner radiuses of the 3 rd group is 1.0 mm;
step two, cleaning and drying the capillary tubes by using absolute ethyl alcohol, immersing the capillary tubes into the absolute ethyl alcohol (the liquid level dimension is 245mm multiplied by 50mm, and the capillary tubes are positioned at the center line of the liquid level parallel to the long edge) by adopting a compensation method under the environment of room temperature and no ventilation, and manually screening the capillary tubes with nearly consistent liquid level height in each group of capillary tubes for parallel test after the liquid in the capillary tubes rises stably;
thirdly, shooting and recording the cross section of the capillary tube of the 3 rd group by using a CCD camera, and determining the inner radius r of the capillary tube 3 ；
Step four, washing with absolute ethyl alcoholDrying capillary tubes, vertically placing 3 groups of capillary tubes in absolute ethyl alcohol (the size of the liquid level is 245mm multiplied by 50mm, and the capillary tubes are positioned at the position of the central line of the liquid level parallel to the long edge) by adopting a compensation method under the environment of room temperature and no ventilation until the liquid in the capillary tubes stably rises, taking a picture to record the rising height of the absolute ethyl alcohol under the condition that the lens is kept level with the liquid level of the capillary tubes, taking a picture to record the concave liquid level in the capillary tubes through a CCD (charge coupled device) camera (the picture is taken and recorded within 10 minutes), recording the test temperature, and leading the picture into a CAD (computer aided design) to mark the maximum rising height h of the liquid in the capillary tubes on the same horizontal plane 1 ～h 3 Fitting the concave liquid level to be a spherical crown to obtain a contact angle theta between the liquid and the pipe wall 1 ～θ 3 As shown in fig. 2;
step five, according to the inner radius r of the third group of capillaries 3 Height h of liquid level 1 ～h 3 Angle of contact theta of concave liquid surface 1 ～θ 3 Surface tension of absolute ethyl alcohol gamma e Density of absolute ethanol rho e Respectively calculating the inner radius r of the capillary tubes of the 1 st group and the 2 nd group by using formula 1 of a differential capillary tube method 1 、r 2 See tables 2 and 3, wherein the absolute ethanol surface tension γ e And density ρ e According to formula 3 and table 1;
equation 3: gamma ray e ＝24.05-0.0832×T；
In the formula: gamma ray e Is the surface tension of absolute ethyl alcohol, and the unit is dyn/cm; t is the test temperature and the unit is;
TABLE 1 Absolute ethanol Density vs. temperature Table (g/cm) 3 )
Step six, cleaning and drying the capillary tubes, vertically placing the capillary tubes of the group 1 and the group 2 in asphalt which is heated to a flowing state (the liquid surface size is 245mm multiplied by 50mm, and the capillary tubes are at the position of the central line of the liquid surface parallel to the long side), keeping the temperature at 135 ℃ for a period of time (about 7 h) until the asphalt in the capillary tubes is not raised any more, and ensuring that the lens and the hair are not raised any moreTaking a picture and recording immediately under the condition that the liquid level of the capillary is level, importing the picture into CAD (computer aided design) to calibrate the height value of the capillary on the same horizontal plane after the capillary is stable, selecting a higher rise value of each group of capillaries as effective data, testing the effective rise height value of not less than 3 and the variation coefficient of not more than 0.03 by using a differential capillary method formula 2 (the asphalt density is tested by a densitometer method, and the result is 0.934 (g/cm) 3 ) Obtaining a calculated value of the surface tension of the high-temperature liquid asphalt;
seventhly, repeating the step six for 3 times, testing the calculated value of the surface tension of the No. 70 surface active warm mix asphalt at 135 ℃ with the doping amount of the warm mix agent being 0.2%, 0.4% and 0.5%, and the test result is shown in table 2;
TABLE 2 warm mix asphalt surface tension test results of calibration curve doping amount
Note: the inner radius of the 3 rd group of capillaries is determined by leading the inner radius of the capillaries shot by a CCD camera into CAD;
step eight, drawing a fitting curve by using a least square method and taking a calculated value of the surface tension of the surface active warm mix asphalt No. 70 as a horizontal coordinate and a corresponding mixing amount of a warm mix agent as a vertical coordinate, wherein the fitting formula is shown in FIG. 3: w-4.742 gamma 2 -184.828γ+1801.271；
Step nine, repeating the step one to the step six, testing the calculated value gamma of the surface tension of the warm-mixed asphalt at 135 ℃ with the warm-mixed agent mixing amount of 0.3 percent, and referring to the table 3, wherein the test result is 19.394(dyn/cm), and substituting the test result into a fitting formula, wherein the fitting result is 0.312 percent;
TABLE 3 surface tension test results of warm mix asphalt to be tested
Note: the inner radius of the group 3 capillary tubes is determined by introducing the inner radius into CAD after being shot by a CCD camera.
According to the working principle of the surfactant, in a certain mixing amount range, along with the increase of the mixing amount of the warm-mix agent, the surface tension of the surface active warm-mix asphalt is gradually reduced, and the wettability is enhanced. As can be seen from tables 2 and 3, after the warm-mixing agent is added, the calculated value of the surface tension is obviously reduced, and in the range of 0.2% -0.5% of the mixing amount, along with the increase of the mixing amount of the warm-mixing agent, the calculated value of the surface tension shows an obvious decline trend, which is consistent with the actual situation, and the evaluation index surface tension using the method has sensitivity to the mixing amount of the warm-mixing agent and stable result. The difference between 0.312% of the doping amount of the warm mixing agent to be measured obtained according to the fitting formula and 0.3% of the actual doping amount is 0.012%, which shows that the calculation result of the invention is more accurate.
The method provided by the invention is easy to realize, has accurate test results, and provides a basis for detecting the mixing amount of the warm-mixing agent in construction, so that the method has very good application value.
Claims (12)
1. A method for detecting the mixing amount of a surface active warm mixing agent in asphalt is characterized by comprising the following steps:
step one, selecting 3 groups of homogeneous different-diameter capillaries, wherein the inner radius of the capillaries in the 1 st group and the 2 nd group is within the range of 0.08-0.25 mm, the inner radius of the capillaries in the 3 rd group is within the range of 0.7-1.2 mm, and the ratio of the larger inner radius to the smaller inner radius of any two groups of capillaries is not less than 1.6;
step two, cleaning and drying the capillary tubes, immersing the capillary tubes into absolute ethyl alcohol at room temperature in a non-ventilated environment until liquid in the capillary tubes rises stably, and screening out capillary tubes with the same liquid level height in the capillary tubes for a parallel test;
step three, shooting and recording the cross section of the capillary tube of the group 3 by using a camera, and determining the inner radius r of the capillary tube 3 ；
Step four, cleaning and drying the capillary tubes, and vertically placing 3 groups of capillary tubes into the capillary tubes in absolute ethyl alcohol in a room temperature and non-ventilated environmentAfter the liquid rises stably, the maximum height h of the liquid in the capillary tube rising on the same horizontal plane is shot and recorded 1 ～h 3 And the concave liquid level in the capillary, recording the test temperature, and obtaining the contact angle theta between the liquid and the pipe wall after fitting the concave liquid level into a spherical crown shape 1 ～θ 3 ；
Step five, according to the inner radius r of the third group of capillaries 3 Height h of liquid level 1 ～h 3 Concave liquid surface contact angle theta 1 ～θ 3 Surface tension gamma of absolute ethyl alcohol e Density of absolute ethanol ρ e Respectively calculating the inner radius r of the capillary tubes of the 1 st group and the 2 nd group by using formula 1 of a differential capillary tube method 1 、r 2 ；
Equation 1:
in the formula: gamma ray e Is the surface tension of absolute ethyl alcohol at the test temperature, and the unit is dyn/cm; rho e The density of the absolute ethyl alcohol at the test temperature is expressed in g/cm 3 (ii) a The Ag is the local acceleration of gravity with the unit of N/kg; i is the serial number of the capillary group with different inner radiuses, i is 1 and 2; h is i 、h 3 The maximum rising height of the upper edge of the absolute ethyl alcohol concave liquid surface in the capillary tubes with different inner radius groups on the same horizontal plane is in mm; r is i 、r 3 The inner radius of the capillary tube in different inner radius groups is in mm; theta i 、θ 3 Fitting the inner concave liquid surfaces of the capillaries with different inner radius groups into a contact angle behind a spherical crown shape;
step six, cleaning and drying the capillary tubes, vertically placing the capillary tubes of the group 1 and the group 2 in high-temperature liquid asphalt to be tested, keeping the temperature for a period of time at constant temperature until the asphalt in the capillary tubes does not rise any more, immediately shooting and recording the height values of the asphalt in the two groups of capillary tubes on the same horizontal plane after the asphalt rises stably after the constant temperature is finished, and obtaining the calculated value of the surface tension of the high-temperature liquid asphalt by utilizing a formula 2 of a differential capillary tube method;
equation 2:
in the formula: gamma ray a The calculated value of the surface tension of the asphalt at the test temperature is dyn/cm; rho a The density of the asphalt at the test temperature is given in g/cm 3 (ii) a Ag is the local acceleration of gravity, in N/kg; h 1 、H 2 The maximum rising height of the upper edges of the asphalt concave liquid surfaces in two groups of capillary tubes below the same horizontal plane is in mm; r is 1 、r 2 The radius of the two groups of capillaries is in mm;
step seven, repeating the step six, and measuring the calculated surface tension value gamma of the warm-mixed asphalt under different surface activity warm-mixed agent mixing amounts a ；
Step eight, calculating a value gamma by using the surface tension of the surface active warm mix asphalt a Taking the horizontal coordinate as well as the vertical coordinate of the corresponding mixing amount w of the warm-mixing agent, drawing a fitting curve by adopting a least square method, and taking the curve as a calibration curve of the mixing amount of the warm-mixing agent at a calibration temperature;
and step nine, repeating the step six, measuring a calculated surface tension value of the surface active warm-mixed asphalt to be measured at the calibration temperature, and comparing a calibration curve of the mixing amount of the warm-mixed agent at the calibration temperature to determine the mixing amount of the warm-mixed agent.
2. The method for detecting the mixing amount of the surface active warm-mixing agent in the asphalt according to claim 1, which is characterized by comprising the following steps: in the second step, the fourth step and the sixth step, the step of cleaning the capillary tube is to clean the capillary tube by using ultrasonic waves and absolute ethyl alcohol as a cleaning solution.
3. The method for detecting the mixing amount of the surface active warm-mix agent in the asphalt according to claim 1, which is characterized by comprising the following steps: in the second step and the fourth step, the rising height of the absolute ethyl alcohol is determined by adopting a compensation method, namely after the liquid level in the capillary stops rising, the liquid level height of the absolute ethyl alcohol outside the capillary is slowly reduced until the liquid in the capillary of 3 groups of capillaries all falls down, and then the liquid level in the capillary is stopped waiting to be stable.
4. The method for detecting the mixing amount of the surface active warm-mixing agent in the asphalt according to claim 1, which is characterized by comprising the following steps: in step three, the inner radius r of the capillary tube in the 3 rd group 3 The result is obtained after the CCD camera shoots and images.
5. The method for detecting the mixing amount of the surface active warm-mixing agent in the asphalt according to claim 1, which is characterized by comprising the following steps: in the fourth step and the sixth step, the liquid surface size of the liquid tested by the experiment is larger than the rectangular size of 100mm multiplied by 50mm, and the capillary is positioned on the central line of the liquid surface parallel to the long edge.
6. The method for detecting the mixing amount of the surface active warm-mixing agent in the asphalt according to claim 1, which is characterized by comprising the following steps: in step four, the absolute ethanol differential test should be completed within 10 minutes.
7. The method for detecting the mixing amount of the surface active warm-mixing agent in the asphalt according to claim 1, which is characterized by comprising the following steps: in step four, the contact angle θ 1 ～θ 3 Shooting and imaging through a charge coupled device camera, and obtaining the target by fitting the concave liquid level in the capillary tube into a spherical crown shape by using computer aided design software.
8. The method for detecting the mixing amount of the surface active warm-mixing agent in the asphalt according to claim 1, which is characterized by comprising the following steps: in step five, gamma e Obtained by the relation of absolute ethyl alcohol surface tension and temperature, rho e And obtaining the product through an absolute ethyl alcohol density meter.
9. The method for detecting the mixing amount of the surface active warm-mixing agent in the asphalt according to claim 1, which is characterized by comprising the following steps: in the sixth step, the testing temperature of the asphalt is within the range of 135-185 ℃.
10. The method for detecting the mixing amount of the surface active warm-mixing agent in the asphalt according to claim 1, which is characterized by comprising the following steps: and in the sixth step, the constant temperature time of the asphalt is 5-8 h.
11. The method for detecting the mixing amount of the surface active warm-mix agent in the asphalt according to claim 1, which is characterized by comprising the following steps: and step six, selecting the height value with higher liquid level rise as effective data, wherein the effective data of each group of capillaries is not less than 3, and the coefficient of variation is not more than 0.03.
12. The method for detecting the mixing amount of the surface active warm-mix agent in the asphalt according to claim 1, which is characterized by comprising the following steps: and in the step eight, the data for fitting the curve is not less than 3, and the doping amount to be measured is ensured to be between the maximum warm-mixing agent doping amount and the minimum warm-mixing agent doping amount of the fitting curve, and the doping amount to be measured is obtained by interpolation of the curve and cannot be obtained by using a curve extension means.
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| CN112834390B (en) * | 2020-12-31 | 2022-08-09 | 云南建投路面工程有限公司 | Method for rapidly determining mixing amount and cooling amplitude of warm mixing agent for viscosity-reduced road |
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| US6085577A (en) * | 1996-10-03 | 2000-07-11 | Chem-Dyne Research Company | Surface tension measurement in a pressurized environment |
| CN101750515A (en) * | 2008-12-03 | 2010-06-23 | 中国科学院理化技术研究所 | Non-contact measurement method for measuring liquid parameter |
| CN110631961A (en) * | 2019-09-27 | 2019-12-31 | 深圳市市政工程总公司 | Method for determining optimal mixing amount of warm-mix agent of fiber warm-mix asphalt mixture |
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| WO2003014707A1 (en) * | 2001-08-10 | 2003-02-20 | Jenser Technology Ab | Method and instrument for measuring surface tension |
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| CN101750515A (en) * | 2008-12-03 | 2010-06-23 | 中国科学院理化技术研究所 | Non-contact measurement method for measuring liquid parameter |
| CN110631961A (en) * | 2019-09-27 | 2019-12-31 | 深圳市市政工程总公司 | Method for determining optimal mixing amount of warm-mix agent of fiber warm-mix asphalt mixture |
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