CN114910415A - Pendulum instrument-based pavement anti-skid performance evaluation method - Google Patents
Pendulum instrument-based pavement anti-skid performance evaluation method Download PDFInfo
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- 238000012360 testing method Methods 0.000 claims abstract description 62
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims description 51
- 239000000203 mixture Substances 0.000 claims description 10
- 239000010426 asphalt Substances 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims 1
- 238000002156 mixing Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000010998 test method Methods 0.000 abstract description 2
- 238000012937 correction Methods 0.000 description 23
- 238000005259 measurement Methods 0.000 description 7
- 238000011160 research Methods 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 3
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- 230000003247 decreasing effect Effects 0.000 description 2
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- 238000011895 specific detection Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to the technical field of road monitoring, in particular to a method for evaluating the anti-skid performance of a pavement based on a pendulum instrument. The main instruments and equipment used by the invention are universal with the existing test standard, and the test method is also the same as the prior art, thereby not causing extra learning cost.
Description
Technical Field
The invention relates to the technical field of road monitoring, in particular to a pavement anti-skid performance evaluation method based on a pendulum instrument.
Background
The skid resistance is an important index of road performance of a road surface, is directly related to traffic safety, and is a key attention index in the engineering field in both engineering construction stage and completion acceptance stage. At present, pendulum value measurement by using a pendulum friction coefficient meter is an important way for obtaining the anti-skid performance of a road surface, but pendulum value detection is influenced by various internal and external factors, so that the accuracy of the evaluation of the anti-skid performance of the road surface is greatly reduced.
The pendulum instrument has the following main technical problems in the aspect of evaluating the anti-skid performance of the road surface:
1. the influence of temperature factors on the swing value cannot be eliminated,
as the pendulum value measured by the pendulum instrument is greatly influenced by the temperature, the T0964-2008 method in the existing JTG3450 and 2019 road foundation and pavement site test regulation provides that the measured pendulum value is uniformly corrected to the pendulum value at the standard temperature of 20 ℃, and the corrected value is given as shown in Table 1.
Pendulum temperature correction values in tables 1T0964-2008
| Temperature (. degree. C.) | 0 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 |
| Temperature correction value delta BPN | -6 | -4 | -3 | -1 | 0 | +2 | +3 | 5 | +7 |
According to the rules of the test protocol, the corrections of Table 1 are "derived based on the results of the test performed in the country" and can be considered as statistically mean corrections. Aiming at different pendulous instruments, different road surface types and different operators nationwide, the use of a unified correction value can be unfavorable for the evaluation accuracy of the anti-skid performance;
secondly, for the correction value of the intermediate temperature, the regulation stipulates that "the correction value can be calculated by adopting an interpolation method", and the actual detection environment temperature often exceeds the temperature range of the table 1, and at the moment, the correction value cannot be calculated by adopting the interpolation method.
Therefore, the influence of the temperature on the swing value still exists in the prior art.
2. The pendulum instrument has poor reproducibility of detection,
in the detection practice, it is found that one or two of the pendulum instrument and the operator are replaced aiming at the same detection point, the pendulum value test is greatly changed, and the detection value reproduction is difficult to realize.
The problem has a great influence on the research on the attenuation of the anti-skid performance of the road surface, because the fixed measuring points of the road surface need to be irregularly detected in the research process of the attenuation of the anti-skid performance of the road surface, the situation that a pendulum instrument or a detector needs to be replaced is inevitable in the whole research period, and the attenuation rule analysis cannot be realized due to the huge detection result difference.
Therefore, the practical problem facing the field of pavement detection is to seek a pavement anti-skid performance evaluation method based on a pendulum instrument and improve the objectivity and accuracy of pavement anti-skid performance evaluation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for evaluating the anti-skid performance of a pavement based on a pendulum instrument.
In order to realize the purpose, the invention adopts the following technical scheme:
a pavement skid resistance evaluation method based on a pendulum instrument comprises the following steps,
s1, preparing a standard test board,
the standard test plate size is 300mm 50 mm;
s2, detecting a pendulum value BPN (T) of the road surface to be detected, and recording the temperature T of the road surface at the detected point;
s3, the standard test board keeps warm,
the standard test board is insulated in the insulation device according to the pavement temperature T measured in the step S2, the insulation time is longer than 1.5h, so that the temperature of the standard test board is consistent with the pavement temperature T at the measuring point, and the data are accurate;
s4, detecting swing value BPN of standard test board 0 (T)；
S5, calculating a pendulum value ratio mu,
wherein, the swing value ratio mu is calculated by the following formula:
the larger the value of the pendulum value ratio mu is, the better the skid resistance of the road surface is.
In order to eliminate the influence of temperature on a pendulum value detection result in the existing regulation, a pendulum value correction value (shown in table 1) is given based on a large amount of experimental data, but the correction value is a determined absolute value and faces different roads in the nationwide range, and when different operators use different pendulum meters for measurement, the accuracy of the correction value cannot be effectively guaranteed. The pendulum value ratio mu provided by the invention is corrected by adopting a relative value, so that the inaccuracy caused by absolute numerical value correction is eliminated.
When the method provided by the invention is used for evaluating the anti-skid performance of the road surface, if the surface state of a certain measuring point of the road surface is consistent with that of a standard test board, theoretically, as long as the same detecting personnel and instruments of the road surface measuring point and the standard test board are ensured, and the BPN (T) -BPN is no matter what the temperature is 0 (T), that is, μ ═ 1, if the road surface changes and bpn (T) at the road surface measurement point increases, μ > 1, the road surface skid resistance is enhanced (as can be seen from the regulations, the higher the swing value, the better the skid resistance); similarly, when bpn (t) is decreased, μ < 1, the road surface skid resistance is decreased, and therefore, a larger value of the pendulum value ratio μ indicates a better road surface skid resistance. Meanwhile, the mu value represents only the influence of the surface state on the anti-slip performance, so that the physical meaning and the numerical value of the pendulum value ratio mu are not influenced as long as the detection is carried out according to the method provided by the invention even if an operator and a pendulum instrument are replaced.
Preferably, the standard test board is an asphalt mixture rut board, and the mixture type of the standard test board is the same as that of the road surface to be tested.
Preferably, the mixture grade of the standard test board is controlled by matching the standard grade range median, the standard test board is configured by adopting a grade-by-grade aggregate back-matching mode, and the using amount of the asphalt is the same as that of the pavement to be tested.
Preferably, the heat preservation device is an environment box, the length, the width and the height of the heat preservation device are respectively more than or equal to 1.5m, and the temperature control precision range is less than 0.1 ℃.
Preferably, in both steps S2 and S4, the pendulum value and the temperature are measured according to the method T0964-2008 of JTG3450-2019 "road subgrade and road surface on-site test regulation".
Preferably, the detection in step S2 and the detection in step S4 are both performed by the same pendulum and the same detector.
The invention has the beneficial effects that:
1. the invention introduces the standard test board, proposes the ratio of the actually measured pavement pendulum value to the standard test board pendulum value under the same temperature as the pendulum value ratio mu, replaces absolute value correction in the prior art with relative value correction, can realize the analysis and utilization of the actually measured pavement pendulum value in the full temperature range, gets rid of the fettling of the limited correction temperature range to interpolation calculation of the correction value in the prior art, also eliminates the inapplicability of average correction based on large sample statistics to actual detection, simultaneously utilizes the stability of the measured data of the standard test board, and effectively improves the reproducibility of the measured result;
2. the main instruments and equipment used by the invention are universal with the existing test standard, and the test method is also the same as the prior art, thereby not causing extra learning cost.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
Taking 2 times of anti-skid detection in the anti-skid attenuation research process of the asphalt pavement with a certain surface layer of SMA-13 as an example, the test steps are as follows:
s1, preparing a standard test plate:
as the type of the mixture of the surface layer of the pavement to be tested is SMA-13, the standard test board is also formed by using the SMA-13 mixture. The standard test board mixture gradation is controlled according to the median value of the SMA-13 gradation range in JTG F40-2004 technical Specification for road asphalt pavement, which is shown in Table 2. The amount of asphalt is 6.0 percent, and the formed rut plate is ready for use.
TABLE 2 standard test board SMA-13 mixture gradation table
And (3) first detection:
s2-1, detecting a pavement swing value BPN (1T) to be detected, and recording the pavement temperature 1T at a detection point:
a detector uses a 1# pendulum instrument to detect the pendulum value of the road surface to be detected according to a T0964-2008 method in JTG3450-2019 road subgrade and road surface field test regulations, and the actually measured pendulum value and the corrected pendulum value are shown in a table 3:
TABLE 3 first-time detection of road surface swing value
S3-1. Standard test boards incubation:
and after the field detection is finished, detecting an indoor standard test board. Putting the 1# pendulum instrument and the standard test board into an environment box, and sequentially setting the temperature of the environment box to be 1T 1 、1T 2 To 1T 6 And keeping the temperature for 2h at each temperature point.
S4-1, detecting swing value BPN of standard test board 0 (1T)：
A detector uses a 1# pendulum instrument to detect the pendulum value BPN of a standard test board at the temperature by a method T0964-2008 in JTG3450-2019 'on-site test regulations on road subgrade and pavement' in an environment box 0 (1T 1 )。
The pendulum values obtained for the standard test boards at each temperature are shown in table 4:
TABLE 4 results of testing the swing values of the standard test boards for the first time
S5-1, calculating the pendulum value ratio of 1 mu:
according to the formula
The pendulum ratio of each measurement point was calculated, and the results are shown in table 5:
TABLE 5 first-time detection of road surface swing value ratio 1 mu calculation result
And (3) second detection:
s2-2, detecting a pavement swing value BPN (2T) to be detected, and recording the pavement temperature 2T at a detection point:
and (3) performing secondary detection ten days later as planned, but the 1# pendulum instrument is damaged and is being maintained, detecting the swing value of the same detection point of the road surface to be detected by using the 2# pendulum instrument by a b detector according to a T0964-2008 method in JTG3450-2019 highway subgrade road surface field test regulations, wherein the actually measured swing value and the corrected swing value are shown in a table 6:
TABLE 6 second pavement pendulum value test results
S3-2. Standard test boards incubation:
and after the second field detection is finished, detecting the indoor standard test board. Putting the 2# pendulum instrument and the standard test board into an environment box, and sequentially setting the temperature of the environment box to be 2T 1 、2T 2 To 2T 6 And keeping the temperature for 2h at each temperature point.
S4-2, detecting swing value BPN of standard test board 0 (2T)：
Using a 2# pendulum instrument by a b detector to detect the pendulum value BPN of a standard test board at the temperature by a JTG3450-2019 method T0964-2008 in Highway subgrade and pavement site test code in an environment box 0 (2T 1 )。
The pendulum values obtained for the standard test plate at each temperature are shown in table 7:
TABLE 7 second test Standard test Board pendulum value test results
| Detection point | Temperature 2T | Standard test board swing value/BPN 0 (2T) |
| 1 | 2T 1 ＝27.3℃ | BPN 0 (2T 1 )＝77 |
| 2 | 2T 2 ＝30.9℃ | BPN 0 (2T 2 )＝73 |
| 3 | 2T 3 ＝35.8℃ | BPN 0 (2T 3 )＝70 |
| 4 | 2T 4 ＝36.4℃ | BPN 0 (2T 4 )＝69 |
| 5 | 2T 5 ＝38.7℃ | BPN 0 (2T 5 )＝65 |
| 6 | 2T 6 ＝40.3℃ | BPN 0 (2T 6 )＝66 |
S5-2, calculating a pendulum value ratio of 2 mu:
according to the formula
The pendulum ratio of each measurement point was calculated, and the results are shown in table 8:
TABLE 8 calculation results of the second detection of the road surface swing value ratio of 2 μ
The beneficial effects of the invention are analyzed by the examples:
in combination with the above measurement results, the results are corrected using the method given by the existing protocol, and the detection temperatures of the first detection point 1 and the detection point 2 and the second detection point 6 are out of the correction temperature range, so that the correction value cannot be calculated by interpolation. In the first detection, the anti-skid performance of the corrected detection points is ranked as follows: the detection point 6 is greater than the detection point 5 is greater than the detection point 4 is greater than the detection point 3, but the anti-skid performance of the detection points in the second detection is ranked as follows after being corrected: the detection points 1, 2, 4, 5 and 3 are different in anti-sliding performance sequence, and the detection points with partial detection temperature exceeding the correction temperature range cannot be judged;
the method eliminates the influence of temperature on the evaluation of the anti-skid performance, the swing values of all the detection points can be subjected to data analysis, and in the two detections, the order of the anti-skid performance of 6 detection points is as follows: the method adopts relative correction, is more suitable for actual test detection than national absolute correction in the prior art, has the same sequence of the anti-sliding performance of each detection point in the measured results of the two detections, and has better evaluation accuracy on the anti-sliding performance of the detection points than the prior art.
Example 2:
taking the anti-skid detection in the anti-skid attenuation research process of the asphalt pavement with a certain surface layer of SMA-13 as an example, different inspectors use different pendulums to successively use the method provided by the standard and the method provided by the invention to detect at any point on the pavement, the specific detection steps are the same as those in the embodiment 1, and the detection results are shown in Table 9.
TABLE 9 result of different testing personnel and pendulum instruments
The reproducibility of the two techniques for evaluation of anti-slip properties was analyzed using standard deviation comparisons. Defining sigma as standard deviation of regulation corrected pendulum value and sigma' as standard deviation of pendulum value ratio, and calculating sigma to be 3.00 ′ ＝3.63×10 -3 Sigma > sigma' indicates that the rule correction pendulum value dispersion degree is far greater than the pendulum value ratio of the method, and indicates that the reproducibility of measurement on the same measuring point by different people using different pendulum instruments is far worse than the reproducibility of a numerical value measured by the method provided by the invention, so that the method provided by the invention has no obvious influence on the measured result due to the change of people and equipment compared with the method provided by the existing standard, and has small influence on the measured result and more accurate and reliable data when the measurement needs to be carried out for a plurality of times.
Claims (6)
1. A pavement skid resistance evaluation method based on a pendulum instrument is characterized by comprising the following specific steps,
s1, preparing a standard test board,
the standard test plate size is 300mm 50 mm;
s2, detecting a pavement swing value BPN (T) to be detected, and recording the pavement temperature T at a detection point;
s3, the standard test board keeps warm,
the standard test board is insulated in the insulation device according to the pavement temperature T measured in the step S2, and the insulation time is longer than 1.5 h;
s4, detecting swing value BPN of standard test board 0 (T)；
S5, calculating a pendulum value ratio mu,
wherein, the pendulum value ratio mu is calculated according to the following formula:
2. the pendulum instrument-based pavement anti-skid performance evaluation method according to claim 1, wherein the standard test board is an asphalt rut board, and the mixture type of the standard test board is the same as the mixture type of the pavement to be tested.
3. The pendulum instrument-based pavement anti-skid performance evaluation method according to claim 2, wherein the mixture grade of the standard test board is controlled by a median value in a standard grade range, and the standard test board is configured by a step-by-step aggregate blending mode, and the amount of asphalt is the same as the amount of the pavement to be tested.
4. The pendulum-type instrument-based pavement skid resistance evaluation method according to claim 1, wherein the heat preservation device is an environmental box, and the length, width and height of the heat preservation device are respectively greater than or equal to 1.5 m.
5. The pendulum-based pavement skid resistance evaluation method of claim 1, wherein the temperature control accuracy range of the thermal insulation device is less than 0.1 ℃.
6. The method of claim 1, wherein the pendulum values and temperatures are measured in steps S2 and S4 according to JTG3450-2019, on-site test for road subgrade and pavement, T0964-2008.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150140294A1 (en) * | 2004-04-02 | 2015-05-21 | Flint Trading, Inc. | Preformed Thermoplastic Pavement Marking and Method for High Skid Resistance with Maintained High Retroreflectivity |
| CN104992049A (en) * | 2015-06-10 | 2015-10-21 | 华南理工大学 | Method of establishing road surface anti-skid performance with plane position data |
| CN109342313A (en) * | 2018-09-27 | 2019-02-15 | 中路高科交通检测检验认证有限公司 | A kind of metering method of antiskid performance detection apparatus |
| CN109671077A (en) * | 2018-12-24 | 2019-04-23 | 上海智能交通有限公司 | A kind of Bitumen Pavement Anti-Skid Performance detection method and system |
| CN110346283A (en) * | 2019-07-15 | 2019-10-18 | 南京林业大学 | A kind of cover type colored road surface useful life longevity integrated evaluating method |
| US20190362510A1 (en) * | 2018-05-24 | 2019-11-28 | Lu Sun | Method and system for evaluating friction coefficient and skid resistence of a surface |
-
2022
- 2022-04-13 CN CN202210388252.0A patent/CN114910415B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150140294A1 (en) * | 2004-04-02 | 2015-05-21 | Flint Trading, Inc. | Preformed Thermoplastic Pavement Marking and Method for High Skid Resistance with Maintained High Retroreflectivity |
| CN104992049A (en) * | 2015-06-10 | 2015-10-21 | 华南理工大学 | Method of establishing road surface anti-skid performance with plane position data |
| US20190362510A1 (en) * | 2018-05-24 | 2019-11-28 | Lu Sun | Method and system for evaluating friction coefficient and skid resistence of a surface |
| CN109342313A (en) * | 2018-09-27 | 2019-02-15 | 中路高科交通检测检验认证有限公司 | A kind of metering method of antiskid performance detection apparatus |
| CN109671077A (en) * | 2018-12-24 | 2019-04-23 | 上海智能交通有限公司 | A kind of Bitumen Pavement Anti-Skid Performance detection method and system |
| CN110346283A (en) * | 2019-07-15 | 2019-10-18 | 南京林业大学 | A kind of cover type colored road surface useful life longevity integrated evaluating method |
Non-Patent Citations (2)
| Title |
|---|
| 李建才 等: "用摆值F评价路面抗滑性能探讨", 中南公路工程, vol. 22, no. 01, 30 March 1997 (1997-03-30), pages 16 - 17 * |
| 王玉杰: "级配对沥青路面抗滑性的影响研究", 四川水泥, no. 07, 15 July 2016 (2016-07-15), pages 35 * |
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