A method for determining curing time of asphalt pavement
By conducting core sample scattering experiments on asphalt concrete pavement, calculating the scattering loss value, and determining the appropriate health time, the problem of difficult to accurately determine the health time in the prior art is solved, and a more objective and operational health time determination method is achieved.
Patent Information
- Application Number
- CN202411815228.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-04-04
AI Technical Summary
The existing technology lacks a method for determining the health time of asphalt concrete pavement that can be objectively and accurately calculated, which leads to the health time being determined based on experience, which can easily affect the traffic organization and construction organization, or cause early particle drops and other diseases.
By selecting the appropriate rut plate size specifications, after forming, performing health care according to the specified health care time, drilling the core sample specimen, and conducting core sample scattering experiments to calculate the flying loss value to determine the appropriate health care time.
A quantitative calculation test method is provided to reduce human factors, data can be reproduced, and scattered losses are more operable and objective as test evaluation indicators, and the test results are more accurate.
Smart Images
Figure CN119757713A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of road engineering, and in particular to a method for determining the curing time of an asphalt pavement. Background Art
[0002] Asphalt pavement is the main pavement form of my country's expressways. In recent years, with the progress of society, people have paid more and more attention to driving safety. In the hot and humid rainy areas in the south, functional asphalt pavements such as drainage and noise reduction have been increasingly promoted.
[0003] However, in actual use, there are significant differences between drainage and noise reduction pavement and dense graded asphalt concrete pavement. The drainage and noise reduction pavement has larger gaps and uses higher performance grade asphalt. After the drainage and noise reduction asphalt concrete pavement is completed, traffic can be opened when the surface temperature drops to 50°C. Under the action of driving load, functional pavements such as drainage and noise reduction have early diseases such as falling particles and flying. Studies have found that one of the important reasons is that drainage and noise reduction pavements are not well maintained. For this reason, it is necessary to maintain the drainage and noise reduction functional pavements for a certain period of time to prevent early diseases and improve the durability of drainage and noise reduction functional pavements.
[0004] At present, there is a lack of a method for determining the curing time of asphalt concrete pavement. The curing time of asphalt concrete pavement is mostly determined by experience. If the curing time is too long, it will seriously affect the traffic organization and construction organization; if the curing time is too short, it will cause the early grain loss and other diseases of the asphalt concrete pavement. Therefore, it is urgent to invent a method for determining the curing time of asphalt concrete pavement to quantitatively determine the curing time of asphalt concrete pavement. Summary of the invention
[0005] In view of the above problems, the present invention aims to provide a method for determining the curing time of asphalt pavement which can objectively and accurately calculate it.
[0006] To achieve the technical purpose, the solution of the present invention is: a method for determining the curing time of an asphalt pavement, the specific steps are as follows:
[0007] S1. Select the size and specifications of the rutting plate according to the type of asphalt mixture, cure the rutting plate according to the specified curing time after it is formed, and drill core samples to obtain core sample specimens;
[0008] S2. Conduct a core sample scattering test on the treated core sample to obtain the curing time t i The corresponding scattering loss value γ of the core sample i ;
[0009] S3. Determine the appropriate curing time T for the road surface paved with the asphalt mixture by calculating the scattering loss value.
[0010] Preferably, at least three core sample specimens are taken from each rutting plate in step S1; the flying loss value γ in step S2 is i It is the average value of the core sample specimens taken from the rutting plate.
[0011] Preferably, the rutting plate forming test method in step S1 is performed according to T0703 of "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" JTG E20-2011, and the thickness of the rutting plate is 3-5 cm;
[0012] When the maximum nominal particle size of the asphalt mixture is ≤10mm, the rutting plate thickness is formed according to 3-5cm; when the maximum nominal particle size of the asphalt mixture is ≤13mm and >10mm, the rutting plate thickness is formed according to 4-5cm; when the maximum nominal particle size of the asphalt mixture is >13mm, the rutting plate thickness is formed according to 5cm.
[0013] Preferably, the core sample scattering test in step S2 is performed using T0733 of the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" JTG E20-2011.
[0014] As a preferred embodiment, in step S3, the difference Δγ of the flying loss of the core sample specimens at adjacent curing times is calculated. i =γ i-1 -γ i ; When i = b, Δγ b When it is less than or equal to the threshold a, the curing time suitable for the road surface paved with the asphalt mixture is T = t b .
[0015] As a preference, when t i =2i, i=1, 2, 3, ..., t i The unit is h, and the threshold a is 2%.
[0016] As a preference, when the void ratio of the core sample is less than 8%, it is a densely distributed asphalt pavement, and its curing time should be no less than 24h. b Should be ≤10%; when the void ratio of the core sample is 8-18%, it is a semi-open graded asphalt pavement, the curing time should be no less than 36h, and the flying loss value γ b Should be ≤15%; when the void ratio of the core sample is greater than 18%, it is an open-graded asphalt pavement, the curing time should be no less than 48h, and the flying loss value γ b Should be ≤15%.
[0017] The beneficial effects of the present invention are that the method for determining the curing time of asphalt concrete pavement of the present application provides a test method capable of quantitative calculation, with small human factors in the test and the data being reproducible; at the same time, the method uses the flying loss as the test evaluation index, which is more operational and objective, and the test results are more objective. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION
[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0020] like Figure 1 As shown, the specific embodiment of the present invention is a method for determining the curing time of an asphalt pavement, and the specific steps are as follows:
[0021] S101, forming the rutting plate, the thickness of the rutting plate is 3-5cm, after the rutting plate is formed, the road surface is lowered to 50℃ and 3-5 core sample specimens are drilled; the rutting plate is formed according to the specified curing time;
[0022] The rutting plate forming test method adopts T0703 of "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" JTG E20-2011, and the rutting plate thickness is 3-5cm; when the maximum nominal particle size of the asphalt mixture is ≤10mm, the rutting plate thickness is formed according to 3-5cm; when the maximum nominal particle size of the asphalt mixture is ≤13mm and >10mm, the rutting plate thickness is formed according to 4-5cm; when the maximum nominal particle size of the asphalt mixture is >13mm, the rutting plate thickness is formed according to 5cm.
[0023] S102. Conduct scattering tests on small core specimens at different curing times;
[0024] S103. Calculate the mass loss γ of the core sample under different curing time conditions, and find t i Time Correspondence γ i The core sample scattering test is carried out in accordance with T0733 of the Test Procedure for Asphalt and Asphalt Mixtures in Highway Engineering JTG E20-2011.
[0025] S104, evaluate and determine the curing time T of the asphalt concrete pavement; calculate the difference Δγ in the flying loss of the core sample specimens at adjacent curing times i =γ i-1 -γ i ; When i = b, Δγ b When it is less than or equal to the threshold a, the curing time suitable for the road surface paved with the asphalt mixture is T = t b .
[0026] When t i =2i, i=1, 2, 3, ..., t i The unit is h, and the threshold a is 2%. When the void ratio of the core sample is less than 8%, it is a dense asphalt pavement, and its curing time should be no less than 24h. Its flying loss value γ bShould be ≤10%; when the void ratio of the core sample is 8-18%, it is a semi-open graded asphalt pavement, the curing time should be no less than 36h, and the flying loss value γ b Should be ≤15%; when the void ratio of the core sample is greater than 18%, it is an open-graded asphalt pavement, the curing time should be no less than 48h, and the flying loss value γ b Should be ≤15%.
[0027] Embodiment 1
[0028] This method is used to determine the curing time of PAC-13 asphalt pavement. PAC-13 asphalt pavement is an open-graded asphalt pavement. The void ratio of the core sample is generally 10%-22%. PAC-13 asphalt mixture is mixed according to the mix ratio requirements, and then a rutting plate (thickness 5cm) is formed in the laboratory and tested according to this application method. The results are shown in Table 1 below:
[0029] Table 1 PAC-13 asphalt concrete pavement curing time test results (%)
[0030] Health preservation time (h) <![CDATA[Mass scattering loss value γ i > <![CDATA[Scattering loss difference Δγ i > 8 60 / 16 55 5 24 45 10 32 35 10 40 22 13 48 18 4 56 15 3 64 10 5 72 9 1
[0031] The curing time test of PAC-13 asphalt concrete pavement can quantitatively determine that the appropriate curing time for PAC-13 should be t b =72h. This method can also obtain objective results and effectively distinguish between the two groups without requiring any experience from the test personnel.
[0032] Embodiment 2
[0033] SMA-10 asphalt pavement is a dense graded asphalt pavement. The void ratio of the core sample is generally 3-6%. SMA-10 asphalt mixture is mixed according to the mix ratio requirements, and then a rutting plate (thickness 5 cm) is formed in the laboratory, and the test is carried out according to the method of the present invention. The results are shown in Table 2 below:
[0034] Table 2 SMA-10 asphalt concrete pavement curing time test results (%)
[0035] Health preservation time (h) <![CDATA[Mass scattering loss value γ i > <![CDATA[Scattering loss difference Δγ i > 8 15 / 16 10 5 24 9 1
[0036] The SMA-10 asphalt concrete pavement curing time test can quantitatively determine that the appropriate curing time for SMA-10 asphalt concrete pavement should be t b =24h. This method can also obtain objective results and quantitatively determine the maintenance time of SMA-10.
[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any slight modification, equivalent substitution and improvement made to the above embodiment based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.
Claims
1. A method for determining the curing time of an asphalt pavement, characterized in that: The specific steps are as follows: S1. Select the size and specifications of the rutting plate according to the type of asphalt mixture, cure the rutting plate according to the specified curing time after it is formed, and drill core samples to obtain core sample specimens; S2. Conduct a core sample scattering test on the treated core sample to obtain the curing time t i The corresponding scattering loss value γ of the core sample i ; S3. Determine the appropriate curing time T for the road surface paved with the asphalt mixture by calculating the scattering loss value.
2. The method for determining the curing time of asphalt pavement according to claim 1, characterized in that: In step S1, at least three core samples are taken from each rutting plate; in step S2, the flying loss value γ i It is the average value of the core sample specimens taken from the rutting plate.
3. The method for determining the curing time of asphalt pavement according to claim 2, characterized in that: The rutting plate forming test method in step S1 is implemented according to T0703 of "Testing Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" JTG E20-2011, and the thickness of the rutting plate is 3-5 cm; When the maximum nominal particle size of the asphalt mixture is ≤10mm, the rutting plate thickness is formed according to 3-5cm; when the maximum nominal particle size of the asphalt mixture is ≤13mm and >10mm, the rutting plate thickness is formed according to 4-5cm; when the maximum nominal particle size of the asphalt mixture is >13mm, the rutting plate thickness is formed according to 5cm.
4. The method for determining the curing time of asphalt pavement according to claim 2, characterized in that: The core sample scattering test in step S2 is performed according to T0733 of the "Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering" JTG E20-2011.
5. The method for determining the curing time of asphalt pavement according to claim 2, characterized in that: In step S3, the difference Δγ of the flying loss of the core sample specimens at adjacent curing times is calculated. i =γ i-1 -γ i ; When i = b, Δγ b When it is less than or equal to the threshold a, the curing time suitable for the road surface paved with the asphalt mixture is T = t b .
6. The method for determining the curing time of asphalt pavement according to claim 5, characterized in that: When t i =2i, i=1, 2, 3, ..., t i The unit is h, and the threshold a is 2%.
7. The method for determining the curing time of asphalt pavement according to claim 5, characterized in that: When the void ratio of the core specimen is less than 8%, it is a dense asphalt pavement, and its curing time should be no less than 24h. Its flying loss value γ b Should be ≤10%; when the void ratio of the core sample is 8-18%, it is a semi-open graded asphalt pavement, the curing time should be no less than 36h, and the flying loss value γ b Should be ≤15%; when the void ratio of the core sample is greater than 18%, it is an open-graded asphalt pavement, the curing time should be no less than 48h, and the flying loss value γ b Should be ≤15%.