Method, system and storage medium for determining hot mix asphalt mixture construction and workability

Abstract

The present application provides a kind of hot asphalt mixture construction and the determination method of workability, system and storage medium, by testing the actual void ratio under different compaction times conditions to obtain compaction times and void ratio relationship curve, according to the type of mixture determines target void ratio upper limit curve and target void ratio median curve, according to the first compaction times and second compaction times determine compaction times average value, and determine the node actual void ratio corresponding to compaction times in target times, according to compaction times average value determines the first construction and workability grade of the asphalt mixture sample to be measured, and according to node actual void ratio determines the second construction and workability grade of the asphalt mixture sample to be measured, when the first construction and workability grade and the second construction and workability grade are consistent, the first construction and workability grade or the second construction and workability grade is used as the construction and workability grade of the asphalt mixture sample to be measured.The present application can objectively and accurately determine the workability of hot asphalt mixture.

Description

Technical Field

[0001] This invention relates to the field of asphalt mixture technology, and in particular to a method, system and storage medium for determining the workability of hot-mix asphalt mixtures. Background Technology

[0002] In pavement repair projects, scenarios with limited effective repair time are frequently encountered, especially in airport asphalt pavement repair. Hot-mix asphalt mixtures (HMIs) are commonly used for airport asphalt pavement repair. However, HMIs have also presented numerous problems in asphalt pavement repair projects. The main reason is that most airport pavement repair work is carried out at night without interrupting flight operations. The HMIs used for airport pavement repair cool down relatively quickly. If the workability of the asphalt mixture is poor, meaning it is difficult to mix and compact, this will severely affect the bonding performance and compaction quality of the repair material. Furthermore, the limited repair time of only 4-5 hours between flights at airports at night further reduces the compaction density, impacting the repair effect. Therefore, the workability of the asphalt mixture sample during mixing, paving, and compaction should be excellent, and it should be compacted to the specified density in the shortest possible time.

[0003] However, to date, most international methods rely on empirical judgment, and there is no clear definition or quantitative determination of the workability of hot-mix asphalt mixtures. The workability of hot-mix asphalt mixtures can only be subjectively judged by human experience.

[0004] Therefore, it is necessary to propose a method, system, and storage medium for determining the workability of hot-mix asphalt mixtures in order to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0005] The main objective of this invention is to provide a method, system, and storage medium for determining the workability of hot-mix asphalt mixtures, in order to solve the problem that in the prior art, the workability of hot-mix asphalt mixtures can only be determined subjectively by human experience, which affects the pavement repair effect.

[0006] To achieve the above objectives, the present invention provides a method for determining the workability of hot-mix asphalt mixtures, comprising the following steps:

[0007] S1. Marshall specimens were prepared by compacting the asphalt mixture sample to be tested with different numbers of compaction tests. The actual void ratio under different compaction conditions was tested, and the relationship curve a between the number of compaction and void ratio of the asphalt mixture sample to be tested was determined based on the number of compaction and the corresponding actual void ratio.

[0008] S2, obtain the mixture type of the asphalt mixture sample to be tested, obtain the target void ratio range of the asphalt mixture sample to be tested according to the mixture type, and determine the upper limit curve b and the median curve c of the target void ratio according to the target void ratio range.

[0009] S3, determine whether there is a first intersection between the curve a of the relationship between the number of compactions and the porosity and the upper limit curve b of the target porosity, and determine whether there is a second intersection between the curve a of the relationship between the number of compactions and the porosity and the median curve c of the target porosity;

[0010] S41, when both of the following conditions are met simultaneously: there is a first intersection between the curve a of the relationship between the number of compactions and the porosity and the curve b of the upper limit of the target porosity, and there is a second intersection between the curve a of the relationship between the number of compactions and the porosity and the curve c of the median value of the target porosity, the first number of compactions corresponding to the first intersection is obtained, and the second number of compactions corresponding to the second intersection is obtained, and then proceed to S5;

[0011] S42, when both of the following conditions are met simultaneously, the first number of compaction points corresponding to the first intersection point is obtained, and the standard number of compaction points of the airport asphalt mixture Marshall specimen is used as the second number of compaction points, and then proceed to step S5;

[0012] S5, determine the average number of compactions Wct based on the first number of compactions and the second number of compactions, and determine the actual void ratio Wvv of the node corresponding to the number of compactions at the target number;

[0013] S6, determine the first workability grade of the asphalt mixture sample to be tested based on the average number of compaction times Wct, and determine the second workability grade of the asphalt mixture sample to be tested based on the actual void ratio Wvv at the nodes;

[0014] S7, determine whether the first workability grade and the second workability grade are consistent. If the first workability grade and the second workability grade are consistent, take the first workability grade or the second workability grade as the workability grade of the asphalt mixture sample to be tested; wherein, the workability grade includes any one of excellent, good, medium and poor.

[0015] Preferably, step S1, determining the relationship curve a between the number of compactions and the corresponding void ratio based on the number of compactions and the corresponding void ratio, specifically includes the following steps:

[0016] A two-dimensional rectangular coordinate system is established with the number of compactions as the x-axis and the actual porosity corresponding to the number of compactions as the y-axis. The x-value of each number of compactions and the y-value of the corresponding actual porosity are fitted sequentially to obtain the relationship curve a between the number of compactions and the porosity.

[0017] Preferably, the target porosity upper limit curve b is obtained through the following steps:

[0018] Based on the target porosity range, obtain the upper limit value of the porosity within the target porosity range;

[0019] Based on the upper limit value of the porosity, a horizontal straight line parallel to the x-axis is drawn to obtain the upper limit curve b of the target porosity.

[0020] Preferably, the target porosity median curve c is obtained through the following steps:

[0021] Based on the target porosity range, obtain the upper limit and lower limit of the porosity within the target porosity range;

[0022] Determine the average porosity between the upper limit of porosity and the lower limit of porosity;

[0023] The target porosity median curve c is obtained by drawing a horizontal straight line parallel to the x-axis based on the average porosity.

[0024] Preferably, step S3 is followed by the step:

[0025] S31, when both of the following conditions are met simultaneously: the curve a of the relationship between the number of compactions and the void ratio does not have a first intersection point with the curve b of the upper limit of the target void ratio, and the curve a of the relationship between the number of compactions and the void ratio does not have a second intersection point with the curve c of the median value of the target void ratio, the workability grade of the asphalt mixture sample to be tested is determined to be poor.

[0026] Preferably, step S6, determining the first workability grade of the asphalt mixture sample based on the average number of compaction times, Wct, specifically includes the following steps:

[0027] When Wct≤40, the workability grade of the asphalt mixture sample to be tested is determined to be excellent;

[0028] When 40 < Wct ≤ 55, the workability grade of the asphalt mixture sample to be tested is determined to be good.

[0029] When 55 < Wct ≤ 70, the workability grade of the asphalt mixture sample to be tested is determined to be medium.

[0030] When Wct > 70, the workability grade of the asphalt mixture sample to be tested is determined to be poor.

[0031] Preferably, step S6, determining the second workability grade of the asphalt mixture sample to be tested based on the actual void ratio Wvv at the node, specifically includes the following steps:

[0032] Based on the target void ratio range, obtain the upper limit value Hvv of the target void ratio and the lower limit value Lvv of the target void ratio for the asphalt mixture sample to be tested.

[0033] exist When the workability grade of the asphalt mixture sample to be tested is determined to be excellent;

[0034] exist When the workability grade of the asphalt mixture sample to be tested is determined to be good;

[0035] exist When the workability grade of the asphalt mixture sample to be tested is determined to be medium;

[0036] When Wvv > Hvv, the workability grade of the asphalt mixture sample to be tested is determined to be poor.

[0037] The present invention also provides a system for determining the workability of hot-mix asphalt mixtures, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, it implements the steps of the method for determining the workability of hot-mix asphalt mixtures as described above.

[0038] The present invention also provides a storage medium storing a computer program, which, when executed by a processor, implements the steps of the method for determining the workability of hot-mix asphalt mixtures as described above.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] This invention provides a method, system, and storage medium for determining the workability of hot-mix asphalt mixtures. The method obtains a curve showing the relationship between the number of compaction passes and the void ratio by testing the actual void ratio under different compaction conditions. Based on the mixture type, it determines the upper limit curve and the median curve of the target void ratio. It determines the average number of compaction passes based on the first and second compaction passes, and determines the actual void ratio at the node corresponding to the target number of compaction passes. Based on the average number of compaction passes, it determines the first workability grade of the asphalt mixture sample to be tested, and based on the actual void ratio at the node, it determines the second workability grade of the asphalt mixture sample to be tested. When the first and second workability grades are consistent, the first or second workability grade is used as the workability grade of the asphalt mixture sample to be tested. This application can objectively and accurately determine the workability of hot-mix asphalt mixtures, and can use it as a reference indicator for the mix design of hot-mix asphalt repair materials for airports. This application provides a visual representation of the relationship between the number of compaction passes and the void ratio in asphalt mixtures. The curve clearly compares the workability of different mixtures, offering valuable guidance for determining the number of compaction passes during airport asphalt pavement repair. Furthermore, this application provides a specific application example (Shanghai Hongqiao International Airport), demonstrating positive results. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of a process in one embodiment of the present invention;

[0043] Figure 2 This is one of the schematic diagrams showing the relationship between the number of compactions and the porosity in one embodiment of the present invention;

[0044] Figure 3 This is a second schematic diagram of the relationship between the number of compactions and the porosity in one embodiment of the present invention.

[0045] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0048] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0049] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination should be considered non-existent and not within the scope of protection claimed by this invention.

[0050] Please see the appendix Figures 1 to 3 The present invention provides a method for determining the workability of hot-mix asphalt mixtures in one embodiment, comprising the following steps:

[0051] S1. Using the Marshall compaction test, Marshall specimens are prepared by compacting the asphalt mixture sample to be tested with different numbers of compaction. The actual void ratio under different compaction conditions is tested, and the relationship curve a between the number of compaction and the void ratio of the asphalt mixture sample to be tested is determined based on the number of compaction and the corresponding actual void ratio. Specifically, using the Marshall compaction test, a certain mass of asphalt mixture sample is compacted with different numbers of compaction to prepare Marshall specimens. The void ratio volume parameter of the specimen under different compaction conditions is tested, and then the relationship curve a between the number of compaction and the void ratio is plotted.

[0052] Further, in step S1, determining the relationship curve a between the number of compactions and the corresponding void ratio specifically includes the following steps: establishing a two-dimensional rectangular coordinate system with the number of compactions as the x-axis and the actual void ratio corresponding to the number of compactions as the y-axis; sequentially fitting the x-value of each number of compactions with the corresponding y-value of the actual void ratio to obtain the relationship curve a between the number of compactions and the void ratio. For details, please refer to the appendix. Figure 2 As shown.

[0053] S2, obtain the mixture type of the asphalt mixture sample to be tested, obtain the target void ratio range of the asphalt mixture sample to be tested according to the mixture type, and determine the upper limit curve b and the median curve c of the target void ratio according to the target void ratio range.

[0054] For airport repair scenarios, the workability standards for common hot-mix asphalt mixtures used in airports are shown in the table below:

[0055]

[0056]

[0057] As shown in the table above, H VV L is the upper limit of the target porosity. VV The target void ratio is the lower limit. Therefore, the target void ratio range of the asphalt mixture sample can be obtained by obtaining the mixture type of the asphalt mixture sample to be tested. The target void ratio upper limit curve b and the target void ratio median curve c can be determined according to the target void ratio range.

[0058] Furthermore, the target porosity upper limit curve b is obtained through the following steps:

[0059] Based on the target porosity range, obtain the upper limit value of the porosity within the target porosity range;

[0060] Based on the upper limit value of the porosity, a horizontal straight line parallel to the x-axis is drawn to obtain the upper limit curve b of the target porosity.

[0061] Furthermore, the target porosity median curve c is obtained through the following steps:

[0062] Based on the target porosity range, obtain the upper limit and lower limit of the porosity within the target porosity range;

[0063] Determine the average porosity between the upper limit of porosity and the lower limit of porosity;

[0064] The target porosity median curve c is obtained by drawing a horizontal straight line parallel to the x-axis based on the average porosity.

[0065] The target porosity upper limit curve b and the target porosity median curve c mentioned above can both be found in the appendix. Figure 2 As shown.

[0066] S3, determine whether there is a first intersection between the curve a of the relationship between the number of compactions and the porosity and the upper limit curve b of the target porosity, and determine whether there is a second intersection between the curve a of the relationship between the number of compactions and the porosity and the median curve c of the target porosity;

[0067] It should be noted that, in order to quantify the workability of the asphalt mixture sample to be tested, this application determines whether there is a first intersection between the curve a of the relationship between the number of compaction times and the void ratio and the curve b of the upper limit of the target void ratio, and whether there is a second intersection between the curve a of the relationship between the number of compaction times and the void ratio and the curve c of the median of the target void ratio. For details, please refer to the appendix. Figure 2 .

[0068] Specifically, in conjunction with the appendix Figure 2 It can be seen that, based on whether the porosity relationship curve a intersects with the target porosity upper limit curve b and the target porosity median curve c, there are three possible scenarios for the porosity relationship curve a. One is that the porosity relationship curve a intersects with the target porosity upper limit curve b and the target porosity median curve c simultaneously (i.e., it has the first intersection point and the second intersection point), such as... Figure 2 curve a in 1 One type is where the porosity relationship curve a intersects with the target porosity upper limit curve b, but does not intersect with the target porosity median curve c (i.e., it has a first intersection point but not a second intersection point), such as... Figure 2 curve a in 2 Another scenario is where the porosity relationship curve a does not intersect with either the target porosity upper limit curve b or the target porosity median curve c (in this case, there is neither a first intersection point nor a second intersection point), such as... Figure 2 curve a in 3 .

[0069] S41, when both of the following conditions are met simultaneously: there is a first intersection between the curve a of the relationship between the number of compactions and the porosity and the upper limit curve b of the target porosity, and there is a second intersection between the curve a of the relationship between the number of compactions and the porosity and the median curve c of the target porosity, the first number of compactions corresponding to the first intersection and the second number of compactions corresponding to the second intersection are obtained, and then proceed to S5; that is, this situation corresponds to curve a 1 ;

[0070] S42, when both of the following conditions are met simultaneously: there is a first intersection between the curve a of the relationship between the number of compactions and the void ratio and the curve b of the upper limit of the target void ratio; and there is no second intersection between the curve a of the relationship between the number of compactions and the void ratio and the curve c of the median value of the target void ratio, the first number of compactions corresponding to the first intersection is obtained, and the standard number of compactions of the airport asphalt mixture Marshall specimen is taken as the second number of compactions, and the process proceeds to step S5; that is, this situation corresponds to curve a. 2 Specifically, the standard compaction number for Marshall specimens of airport asphalt mixtures is 75 blows (standard compaction number). Figure 2 The curve d shown is for 75 compactions, where 75 is taken as the second number of compactions.

[0071] S5, determine the average number of compactions Wct based on the first number of compactions and the second number of compactions, and determine the actual void ratio Wvv of the node corresponding to the number of compactions at the target number;

[0072] It is worth noting that W CT (Workability Compacting Times) refers to the average number of compaction times corresponding to the first and second intersections, W. CT The smaller the value, the better the workability. This method can visually describe the relationship between the number of compaction passes and the void ratio of asphalt mixtures. The curve clearly compares the workability of different mixtures, providing excellent guidance for determining the number of compaction passes during airport asphalt pavement repair.

[0073] W VV Workability Void Volume (W) refers to the void ratio corresponding to the target number of compaction passes for a Marshall specimen (usually based on a standard of 50 passes for highway asphalt mixture Marshall specimens). VV The smaller the size, the better the ease of construction and workability. This method is simple to operate and requires less work.

[0074] S6, determine the first workability grade of the asphalt mixture sample to be tested based on the average number of compaction times Wct, and determine the second workability grade of the asphalt mixture sample to be tested based on the actual void ratio Wvv at the nodes;

[0075] As a preferred embodiment, a standardized workability grade is established for the asphalt mixture samples to be tested. This workability grade includes any one of excellent, good, medium, and poor. Those skilled in the art know that the standard compaction number for Marshall specimens of airport asphalt mixtures is 75 blows, and for highway asphalt mixtures it is 50 blows. Furthermore, laboratory tests have shown that when the number of compaction blows exceeds 55, the porosity of some asphalt mixtures tends to stabilize. In view of the above three points, this application's embodiment adopts W... CT 40, 55, and 70 are used as the dividing points for classifying workability levels.

[0076] Specifically, step S6, determining the first workability grade of the asphalt mixture sample based on the average number of compaction times (Wct), includes the following steps:

[0077] When Wct≤40, the workability grade of the asphalt mixture sample to be tested is determined to be excellent;

[0078] When 40 < Wct ≤ 55, the workability grade of the asphalt mixture sample to be tested is determined to be good.

[0079] When 55 < Wct ≤ 70, the workability grade of the asphalt mixture sample to be tested is determined to be medium.

[0080] When Wct > 70, the workability grade of the asphalt mixture sample to be tested is determined to be poor. As a preferred embodiment, in order to... CT Consistent with the standards for workability and ease of construction, the upper limit of the target porosity (H) is proposed. VV ) and target porosity lower limit (L VV The three equal division points of the workability grade are used as the dividing points for construction workability classification. The workability standards for hot-mix asphalt mixtures commonly used in airports can be obtained from the above form. For example, when the type of hot-mix asphalt mixture is SMA-13, the upper limit of the target void ratio H is... VV The target porosity lower limit L is 5%. VV It is 3%.

[0081] Specifically, step S6, determining the second workability grade of the asphalt mixture sample to be tested based on the actual void ratio Wvv at the node, includes the following steps:

[0082] Based on the target void ratio range, obtain the upper limit value Hvv of the target void ratio and the lower limit value Lvv of the target void ratio for the asphalt mixture sample to be tested.

[0083] exist When the workability grade of the asphalt mixture sample to be tested is determined to be excellent;

[0084] exist When the workability grade of the asphalt mixture sample to be tested is determined to be good;

[0085] exist When the workability grade of the asphalt mixture sample to be tested is determined to be medium;

[0086] When Wvv > Hvv, the workability grade of the asphalt mixture sample to be tested is determined to be poor.

[0087] S7, determine whether the first workability grade and the second workability grade are consistent. If the first workability grade and the second workability grade are consistent, take the first workability grade or the second workability grade as the workability grade of the asphalt mixture sample to be tested; wherein, the workability grade includes any one of excellent, good, medium and poor.

[0088] It is worth noting that this application obtains the corresponding first and second workability grades through two methods. By comparing whether the first and second workability grades are consistent, when they are consistent, either the first or second workability grade is taken as the workability grade of the asphalt mixture sample to be tested. That is, when they are consistent, the two methods have good consistency, improving the accuracy of determining the workability grade of the asphalt mixture sample to be tested. CT The mutual verification process between the method and Wvv.

[0089] Furthermore, step S3 is followed by the following step:

[0090] S31, when both of the following conditions are met simultaneously: the curve a showing the relationship between compaction number and void ratio does not have a first intersection point with the upper limit curve b showing the target void ratio, and the curve a showing the relationship between compaction number and void ratio does not have a second intersection point with the median curve c showing the target void ratio, the workability grade of the asphalt mixture sample to be tested is determined to be poor. This situation corresponds to the attached... Figure 2 curve a in 3 In this situation, for example, when the number of compaction passes reaches 75, the corresponding actual void ratio is above the upper limit of the target void ratio. At this time, the void ratio of the asphalt mixture is still very high, which will seriously affect the bonding performance and compaction quality of the repair material. Therefore, it is judged as having poor workability.

[0091] In addition, this application provides the following application examples to help those skilled in the art to further understand:

[0092] According to W CT or W VV This method was used to determine the workability grade of hot-mix asphalt mixtures for airports. Marshall specimens were prepared with asphalt-aggregate ratios of 6.0% and 6.2%; the number of compaction cycles varied from 75 to 35 at 10-degree intervals. Various volumetric parameters of the Marshall specimens were tested under each compaction cycle condition, and the results are shown in the table below and appendix. Figure 3 .

[0093] Relationship between number of compactions and Marshall volume parameters

[0094]

[0095] In the table above, VV represents the porosity, VMA represents the aggregate void ratio, and VFA represents the bitumen saturation.

[0096] From the above table and Figure 3It can be seen that with the increase of Marshall compaction times, the bulk density and asphalt saturation of hot-mix asphalt mixtures tend to increase, while the aggregate void ratio and porosity tend to decrease. However, when the asphalt-aggregate ratio is 6.0%, the increasing or decreasing trend continues; when the asphalt-aggregate ratio is 6.2% and the number of compaction times is less than 55, the increasing or decreasing trend also continues, and the rate of change is faster than when the asphalt-aggregate ratio is 6.0%; when the asphalt-aggregate ratio is 6.2% and the number of compaction times is greater than 55, the volumetric parameters tend to stabilize. Therefore, in the embodiments of this application, the hot-mix asphalt mixture for airport repair with an asphalt-aggregate ratio of 6.2% has relatively better workability.

[0097] The following quantitative analysis is conducted based on the proposed construction workability determination indicators and standards.

[0098] ①With W CT The target void ratio requirement for hot-mix asphalt mixtures used for airport repairs is 3%–5%, therefore the median target void ratio is 4%. Figure 3 The relationship curve between the number of compactions and the void ratio (VV) shows that when the oil-aggregate ratio is 6.0%, combined with the attached... Figure 3 It can be seen that at this point, the first intersection point and the second intersection point corresponding to curve d correspond to 51 and 75 times of compaction, respectively. Therefore, W CT =63. According to the above examples, the workability grade is medium; when the asphalt-aggregate ratio is 6.2%, there is a first intersection point and a second intersection point (corresponding to the median curve), with corresponding compaction times of 36 and 46 respectively. Therefore, W CT =41, the workability rating is good.

[0099] ②With W VV Let's look at: Target porosity upper limit H VV =5%, target porosity lower limit L VV =3%. By Figure 3 The relationship curve between the number of compaction cycles and the void ratio VV shows that when the asphalt-aggregate ratio is 6.0%, the void ratio W corresponding to 50 compaction cycles of the Marshall specimen is... VV =5.0%, according to the determination standard of SMA-13 ​​in the table above, the workability grade is medium; when the asphalt-aggregate ratio is 6.2%, the porosity W corresponding to 50 compactions of the Marshall specimen is... VV =3.8%, W in conjunction with the above embodiments VV It can be determined that the workability level is good.

[0100] Quantitative analysis shows that the two methods and standards have good consistency. As a preferred example, considering the operability and convenience of determining the workability grade, it is recommended to use the porosity W corresponding to 50 compactions of a Marshall specimen. VVThis study aimed to determine the workability of hot-mix asphalt mixtures for airport repair. Furthermore, the asphalt content significantly impacts the workability of hot-mix asphalt mixtures; a workability ratio of 6.2% is better than that of 6.0%, consistent with theoretical analysis.

[0101] Taking into account the high-temperature stability, water stability, low-temperature crack resistance, and workability of hot-mix asphalt repair materials for airports, the asphalt-aggregate ratio was determined to be 6.2%, and it was applied to Shanghai Hongqiao International Airport with good results.

[0102] The present invention also provides a system for determining the workability of hot-mix asphalt mixtures, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, it implements the steps of the method for determining the workability of hot-mix asphalt mixtures as described above.

[0103] The present invention also provides a storage medium storing a computer program that, when executed by a processor, implements the steps of the method for determining the workability of hot-mix asphalt mixtures as described above. It is understood that, since the method for determining the workability of hot-mix asphalt mixtures is implemented when executed by the processor, all embodiments of the above method are applicable to this storage medium and can achieve the same or similar beneficial effects.

[0104] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for determining the workability of hot-mix asphalt mixtures, characterized in that, Including the following steps: S1. Marshall specimens were prepared by compacting the asphalt mixture sample to be tested with different numbers of compaction tests. The actual void ratio under different compaction conditions was tested, and the relationship curve a between the number of compaction and void ratio of the asphalt mixture sample to be tested was determined based on the number of compaction and the corresponding actual void ratio. S2, obtain the mixture type of the asphalt mixture sample to be tested, obtain the target void ratio range of the asphalt mixture sample to be tested according to the mixture type, and determine the target void ratio upper limit curve b and the target void ratio median curve c according to the target void ratio range; wherein, the target void ratio range is the range from the target void ratio lower limit value to the target void ratio upper limit value corresponding to the mixture type. S3, determine whether there is a first intersection between the curve a of the relationship between the number of compactions and the porosity and the upper limit curve b of the target porosity, and determine whether there is a second intersection between the curve a of the relationship between the number of compactions and the porosity and the median curve c of the target porosity; S41, when both of the following conditions are met simultaneously: there is a first intersection between the curve a of the relationship between the number of compactions and the porosity and the curve b of the upper limit of the target porosity, and there is a second intersection between the curve a of the relationship between the number of compactions and the porosity and the curve c of the median value of the target porosity, the first number of compactions corresponding to the first intersection is obtained, and the second number of compactions corresponding to the second intersection is obtained, and then proceed to S5; S42, when both of the following conditions are met simultaneously, the first number of compaction points corresponding to the first intersection point is obtained, and the standard number of compaction points of the airport asphalt mixture Marshall specimen is used as the second number of compaction points, and then proceed to step S5; S5, determine the average number of compaction times W based on the first number of compaction times and the second number of compaction times. ct And determine the actual porosity W of the node corresponding to the number of compactions at the target number of compactions. vv The target number of compaction tests is 50 standard compaction tests for highway asphalt mixture Marshall specimens. S6, based on the average number of compaction times W ct Determine the first workability grade of the asphalt mixture sample to be tested, and based on the actual void ratio W at the node. vv Determine the second workability grade of the asphalt mixture sample to be tested; S7, determine whether the first workability grade and the second workability grade are consistent. If the first workability grade and the second workability grade are consistent, take the first workability grade or the second workability grade as the workability grade of the asphalt mixture sample to be tested; wherein, the workability grade includes any one of excellent, good, medium and poor.

2. The method for determining the workability of hot-mix asphalt mixtures according to claim 1, characterized in that, Step S1, which determines the relationship curve a between the number of compactions and the corresponding void ratio based on the number of compactions and the corresponding void ratio, specifically includes the following steps: A two-dimensional rectangular coordinate system is established with the number of compactions as the x-axis and the actual porosity corresponding to the number of compactions as the y-axis. The x-value of each number of compactions and the y-value of the corresponding actual porosity are fitted sequentially to obtain the relationship curve a between the number of compactions and the porosity.

3. The method for determining the workability of hot-mix asphalt mixtures according to claim 2, characterized in that, The target porosity upper limit curve b is obtained through the following steps: Based on the target porosity range, obtain the upper limit value of the porosity within the target porosity range; Based on the upper limit value of the porosity, a horizontal straight line parallel to the x-axis is drawn to obtain the upper limit curve b of the target porosity.

4. The method for determining the workability of hot-mix asphalt mixtures according to claim 2, characterized in that, The target porosity median curve c is obtained through the following steps: Based on the target porosity range, obtain the upper limit and lower limit of the porosity within the target porosity range; Determine the average porosity between the upper limit of porosity and the lower limit of porosity; The target porosity median curve c is obtained by drawing a horizontal straight line parallel to the x-axis based on the average porosity.

5. The method for determining the workability of hot-mix asphalt mixtures according to claim 1, characterized in that, The step S3 is followed by the following step: S31, when both of the following conditions are met simultaneously: the curve a of the relationship between the number of compactions and the void ratio does not have a first intersection point with the curve b of the upper limit of the target void ratio, and the curve a of the relationship between the number of compactions and the void ratio does not have a second intersection point with the curve c of the median value of the target void ratio, the workability grade of the asphalt mixture sample to be tested is determined to be poor.

6. The method for determining the workability of hot-mix asphalt mixtures according to claim 1, characterized in that, In step S6, the average number of compactions W is used as the basis. ct Determining the first workability grade of the asphalt mixture sample to be tested specifically includes the following steps: In W ct When the workability of the asphalt mixture sample is ≤40, the workability grade is determined to be excellent. In 40 < W ct When the workability of the asphalt mixture sample is ≤55, the workability grade is determined to be good. In 55 < W ct When the workability grade of the asphalt mixture sample to be tested is ≤70, the workability grade is determined to be medium. In W ct When the workability grade is >70, the workability grade of the asphalt mixture sample to be tested is determined to be poor.

7. The method for determining the workability of hot-mix asphalt mixtures according to claim 1, characterized in that, In step S6, the actual porosity W of the node is used as a reference. vv Determining the second workability grade of the asphalt mixture sample to be tested specifically includes the following steps: The upper limit value H of the target void ratio of the asphalt mixture sample to be tested is obtained according to the target void ratio range. vv and the target porosity lower limit L vv ; In W vv ≤ When the workability grade of the asphalt mixture sample to be tested is determined to be excellent; exist <W vv ≤ When the workability grade of the asphalt mixture sample to be tested is determined to be good; exist <W vv ≤H vv When the workability grade of the asphalt mixture sample to be tested is determined to be medium; In W vv >H vv When the workability grade of the asphalt mixture sample to be tested is determined to be poor.

8. A system for determining the workability of hot-mix asphalt mixtures, characterized in that, The system includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when executed by the processor, the computer program implements the steps of a method for determining the workability of a hot-mix asphalt mixture as described in any one of claims 1 to 7.

9. A storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the method for determining the workability of hot-mix asphalt mixtures as described in any one of claims 1 to 7.

Images