Method and system for predicting performance of hydraulic asphalt concrete based on acid stone powder content threshold value

Abstract

The invention discloses a multi-factor coupling hydraulic engineering asphalt concrete performance prediction method and system based on an acid stone powder content threshold value, and belongs to the technical field of hydraulic engineering material performance evaluation. The method comprises the following steps: acquiring environmental parameters (annual average water temperature T, ultraviolet radiation quantity U and freezing and thawing cycle times F) and material parameters (acidic stone powder content C and alkaline filler content Cbase) of an engineering area; long-term environmental damage is quantified through the synergistic effect of aging damage coefficient D (t) (# imgabs0 #) coupled soaking, ultraviolet rays and freeze thawing; and based on D (t), establishing prediction formulas of mechanical properties sigma (t), deformation properties epsilon (t) and impermeability K (t) for calculation, and when D (t) is less than or equal to 10, sigma (t) is greater than or equal to 1MPa, epsilon (t) is less than or equal to 1.0%, and K (t) is less than or equal to 1 * 1010 <-8 > cm / s, judging that the material is qualified. According to the method, the problem of inaccurate prediction of long-term influence of the acidic stone powder is solved, and material ratio optimization and engineering life evaluation can be accurately guided.

Description

Technical Field

[0001] The present invention relates to the technical field of performance evaluation and maintenance of hydraulic asphalt concrete, and particularly relates to a method and system for predicting the performance of hydraulic asphalt concrete based on the threshold of acidic stone powder content. Background Art

[0002] As an important hydraulic engineering material, hydraulic asphalt concrete is widely used in the construction of hydraulic structures such as dams and levees. It is mainly composed of aggregates, sand, fillers, and asphalt. During the production process, stone powder, especially acidic stone powder, will inevitably be generated. When the content of acidic stone powder exceeds 3%, it will have a significant impact on the performance of hydraulic asphalt concrete.

[0003] Currently, the existing methods for predicting the performance of hydraulic asphalt concrete mainly focus on the evaluation of short-term performance. For the prediction of long-term performance, especially considering the long-term performance prediction when the content of acidic stone powder exceeds 3%, there are obvious deficiencies. These methods often ignore the complex influence of the content of acidic stone powder on the long-term performance of hydraulic asphalt concrete, and cannot accurately predict the changes in the mechanical, deformation, impermeability, and durability of hydraulic asphalt concrete during long-term use, especially under complex natural environmental conditions.

[0004] In practical applications, hydraulic asphalt concrete will be affected by various environmental factors, such as long-term immersion in water, ultraviolet aging, and freeze-thaw cycles. These factors will accelerate the adverse effects of acidic stone powder on the performance of hydraulic asphalt concrete, resulting in the peeling of the interface between aggregates and asphalt, and thus affecting the durability of hydraulic asphalt concrete. However, the existing prediction methods lack comprehensive consideration of the performance changes under the interaction of these environmental factors and the content of acidic stone powder.

[0005] In addition, the existing methods for predicting the performance of hydraulic asphalt concrete also have certain limitations in practical applications. Due to the lack of accurate prediction of the performance changes when the content of acidic stone powder exceeds 3%, it is difficult to reasonably control the content of acidic stone powder during the construction process, which may lead to problems such as performance degradation of hydraulic asphalt concrete during long-term use, increasing the maintenance cost and safety hazards of hydraulic engineering.

[0006] In summary, the existing methods for predicting the performance of hydraulic asphalt concrete have problems such as inaccurate prediction, incomplete prediction, and application limitations when facing the situation where the content of acidic stone powder exceeds 3%. Therefore, there is an urgent need for a system that can accurately predict the mechanical, deformation, impermeability, and durability of hydraulic asphalt concrete after many years when the content of acidic stone powder exceeds 3%, so as to meet the high requirements of hydraulic engineering for the long-term performance of hydraulic asphalt concrete and ensure the safety and stability of hydraulic engineering. Summary of the Invention

[0007] The object of the present invention is to provide a performance prediction method for hydraulic asphalt concrete based on the threshold of acidic stone powder content, aiming at the problems of insufficient consideration of environmental factors and lack of quantification of material interaction in the existing performance prediction methods for hydraulic asphalt concrete, and realizing accurate prediction of the performance in the whole life cycle by establishing a comprehensive aging damage model.

[0008] To achieve the above object, the core technical solution adopted by the present invention is: a performance prediction method for hydraulic asphalt concrete based on the threshold of acidic stone powder content, including the following technical contents:

[0009] S1. Collect the annual average water temperature T, annual ultraviolet radiation dose U, and annual freeze-thaw cycle number F in the area where the hydraulic asphalt concrete is applied;

[0010] S2. Collect the acidic stone powder content C and the alkaline filler content C base ;

[0011] S3. Calculate the comprehensive aging damage coefficient D(t), ;

[0012] where, w water is the immersion weight coefficient, w uv is the ultraviolet weight coefficient, w freeze is the freeze-thaw weight coefficient, and t is the service life of the hydraulic asphalt concrete;

[0013] S4. Calculate the mechanical property σ(t), deformation property ε(t), and impermeability property K(t) according to the aging damage coefficient D(t);

[0014] S5. If D(t) ≤ 10, σ(t) ≥ 1 MPa, ε(t) ≥ 1.0%, and K(t) ≤ 1×10 −8 cm / s, it is determined that the hydraulic asphalt concrete is qualified after t years.

[0015] Furthermore, the calculation formula for the mechanical property σ(t) is: , which consists of 2 parts, namely: alkaline compensation gain and acidic attenuation inhibition ;

[0016] .

[0017] Furthermore, the calculation formula for the mechanical property σ(t) is: ;

[0018] where, λ is the annual gain coefficient of alkaline filler, σ0 is the initial compressive strength, k acid is the acidic stone powder attenuation coefficient, N is the attenuation inhibition denominator coefficient, and C acid is the acidic stone powder content C×100.

[0019] Furthermore, the calculation formula for the deformation performance ε(t) is: ;

[0020] where ε0 is the initial creep strain value and η is the repair efficiency coefficient.

[0021] Furthermore, the calculation formula for the anti-seepage performance K(t) is: ;

[0022] where K0 is the initial permeability coefficient, with a value of 0.95×10 −8 cm / s, and α is the micro-crack expansion coefficient, with a value of 0.10.

[0023] Furthermore, the comprehensive aging damage coefficient D(t) is applicable to the case where the content C of acidic stone powder acid > 3%.

[0024] Furthermore, the value of λ ranges from 0.006 to 0.016, the value of k acid ranges from 0.010 to 0.012, and the value of N ranges from 800 to 1000.

[0025] Furthermore, the value of η ranges from 0.04 to 0.22.

[0026] Furthermore, w water has a value of 0.4, w uv has a value of 0.3, and w freeze has a value of 0.3.

[0027] An electronic device includes: a memory for storing computer program instructions; and a processor for executing the computer program instructions to complete the operations of a method for predicting the performance of hydraulic asphalt concrete based on the threshold of acidic stone powder content as described above.

[0028] A computer-readable storage medium is used to store computer-readable computer program instructions, and the computer program instructions are configured to perform the operations of a method for predicting the performance of hydraulic asphalt concrete based on the threshold of acidic stone powder content as described above when running.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. Accurate long-term performance prediction: Through the calculation of the comprehensive aging damage coefficient D(t) ( ), the present invention fully demonstrates the influence of environmental factors such as immersion in water, ultraviolet rays, and freeze-thaw on hydraulic asphalt concrete during long-term use, and can accurately predict its mechanical, deformation, anti-seepage, and durability performance after many years. It provides a more comprehensive and accurate long-term performance prediction, which helps to take measures in advance to ensure the safety and stability of hydraulic engineering.

[0031] 2. Consideration of targeted acid stone powder content: Performance prediction has been carried out specifically for the case where the acid stone powder content exceeds 3%. When the acid stone powder content exceeds this threshold, it will have a significant impact on the performance of hydraulic asphalt concrete. Through establishing a comprehensive aging damage model, the present invention quantifies the influence of acid stone powder content on the concrete performance, provides a scientific basis for reasonably controlling the acid stone powder content during the construction process, and avoids the problem of performance degradation caused by excessive acid stone powder content.

[0032] 3. Comprehensive evaluation of multi-factor coupling: The present invention not only considers the influence of single environmental factors on the performance of hydraulic asphalt concrete, but also couples multiple environmental factors such as immersion, ultraviolet ray and freeze-thaw through the comprehensive aging damage coefficient D(t), and simulates the comprehensive effect of complex natural environment on the concrete performance in practical applications. This multi-factor coupling evaluation method is more in line with the actual situation and can more truly reflect the performance changes of hydraulic asphalt concrete during long-term use.

[0033] 4. Specific performance determination criteria: Clear performance determination criteria are provided, that is, when the comprehensive aging damage coefficient D(t) ≤ 10, the mechanical property σ(t) ≥ 1 MPa, the deformation property ε(t) ≥ 1.0%, and the anti-seepage property K(t) ≤ 1×10 −8 cm / s, it is determined that the hydraulic asphalt concrete is qualified after t years. This criterion provides a specific reference basis for the construction and maintenance of water conservancy projects, helps to timely discover and handle unqualified concrete, and reduces the maintenance cost and potential safety hazards of water conservancy projects.

[0034] 5. Strong applicability: The present invention is applicable to the performance prediction of hydraulic asphalt concrete in various water conservancy projects. Whether it is for new projects or the maintenance and evaluation of existing projects, it can provide effective technical support. By predicting the performance changes of concrete in advance, the construction progress and maintenance plan can be reasonably arranged, and the construction and operation efficiency of water conservancy projects can be improved. Brief Description of the Drawings

[0035] Figure 1 It is the operation flow of a multi-factor coupling performance prediction method based on acid stone powder content threshold of the present invention. Detailed Embodiment

[0036] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present invention.

[0037] Embodiment 1

[0038] Prediction of the maintenance situation of reservoirs in the central region of China after 5 years based on the multi-factor coupling performance with the threshold of acidic stone powder content:

[0039] Hydraulic asphalt concrete material parameters: C acid = 4, C base = 0.5%;

[0040] Environmental parameters of the reservoir location: T = 15 °C, U = 3200 MJ / m 2 , F = 8 times / year.

[0041] Calculate the comprehensive aging damage coefficient D(t):

[0042] ;

[0043] Calculate the mechanical property σ(t):

[0044] ;

[0045] Calculate the deformation property ε(t):

[0046] ;

[0047] Calculate the impermeability property K(t):

[0048] ;

[0049] ;

[0050] Satisfy D(t) ≤ 10, σ(t) ≥ 1 MPa, ε(t) ≥ 1.0%, K(t) ≤ 1×10 −8 cm / s.

[0051] Comparative Example 1

[0052] Detect the same hydraulic asphalt concrete material as in Example 1.

[0053] 1. Mechanical property

[0054] After the hydraulic asphalt mixture is mixed, the asphalt concrete is first made into plate-shaped specimens according to the regulations, and a flat vibrator is used to vibrate and form with a pressure weight. The mass of the weight is 24 kg, the vibration time is 3 min, the specimens are demolded after cooling at room temperature for 24 h, and then cut into specimens with dimensions of 220 mm × 40 mm × 40 mm (length × height × width), placed in a constant temperature water bath at 15.0 °C for 24 h, and a direct tensile test is carried out at a strain rate of 1.0% / min. The loading equipment for this test is an AG-IC100 kN precision electronic universal testing machine, and the deformation measurement equipment is the supporting facilities of this machine.

[0055] After 5 years of detection, the σ(t) of hydraulic asphalt concrete material is 2.5047 MPa, with a difference of 0.0009 from the predicted value, meeting the statistical expectation.

[0056] After 5 years of detection, the ε(t) of hydraulic asphalt concrete material is 1.98%, with a difference of 0.02% from the predicted value, meeting the statistical expectation.

[0057] 2. Impermeability

[0058] According to the provisions in SL 501 - 2010 "Design Code for Asphalt Concrete Face Slab and Core Wall of Earth - Rock Dam", the impermeability test mold uses a circular test mold with a diameter of about 100.0 mm and a height of about 63.5 mm. The test temperature is 15.0 °C, and the test pressure - applying equipment is an asphalt concrete permeameter.

[0059] After 5 years of detection, the K(t) of hydraulic asphalt concrete material is 0.9620×10 -8 cm / s, with a difference of 0.0103×10 -8 , meeting the statistical expectation.

[0060] The calculated expected values of the mechanical property σ(t), deformation property ε(t), and impermeability property K(t) of the hydraulic asphalt concrete proposed by the present invention are close to the actual values, and can provide a reliable basis for the durability evaluation of hydraulic asphalt concrete many years later.

[0061] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for predicting the performance of hydraulic asphalt concrete based on the acidic stone powder content threshold, characterized in that: The following steps are involved: Collect the annual average water temperature T, annual ultraviolet radiation U, and annual freeze-thaw cycle number F of the area where the hydraulic asphalt concrete is applied; Collect acidic stone powder content C, alkaline filler content C base ; Calculate the comprehensive aging damage coefficient D(t), ; Among them, w water is the water immersion weight coefficient, w uv is the ultraviolet weight coefficient, w freeze is the freeze-thaw weight coefficient, t is the service life of hydraulic asphalt concrete; Calculating the mechanical properties σ(t), deformation properties ε(t) and anti-permeability K(t) according to the aging damage coefficient D(t); If D(t)≤10, σ(t)≥1MPa, ε(t)≥1.0%, K(t)≤1×10 −8 cm / s, the hydraulic asphalt concrete will be judged to be qualified after t years.

2. The method for predicting the performance of hydraulic asphalt concrete based on the acidic stone powder content threshold according to claim 1, characterized in that: The calculation formula of the mechanical property σ(t) is: ; Where λ is the annual gain coefficient of alkaline filler, σ0 is the initial compressive strength, k acid is the acidic stone powder attenuation coefficient, N is the attenuation suppression denominator coefficient, C acid The acidic stone powder content C×100.

3. The method for predicting the performance of hydraulic asphalt concrete based on the acidic stone powder content threshold according to claim 1, characterized in that: The calculation formula of the deformation performance ε(t) is: ; Where ε0 is the initial creep strain value and η is the repair efficiency coefficient.

4. The method for predicting the performance of hydraulic asphalt concrete based on the acidic stone powder content threshold according to claim 1, characterized in that: The calculation formula of the anti-seepage performance K(t) is: ; Where K0 is the initial permeability coefficient and α is the microcrack expansion coefficient.

5. The method for predicting the performance of hydraulic asphalt concrete based on the acidic stone powder content threshold according to claim 1, characterized in that: The comprehensive aging damage coefficient D(t) is applicable to the acidic stone powder content C acid >3% of the cases.

6. The method for predicting the performance of hydraulic asphalt concrete based on the acidic stone powder content threshold according to claim 2, characterized in that: The value of λ is between 0.006-0.016, k acid The value of is between 0.010-0.012, and the value of N is between 800-1000.

7. The method for predicting the performance of hydraulic asphalt concrete based on the acidic stone powder content threshold according to claim 3, characterized in that: The value of η is between 0.04 and 0.

22.

8. An electronic device, characterized in that: include: A memory for storing computer program instructions; and a processor for executing the computer program instructions to complete the operation of a hydraulic asphalt concrete performance prediction method based on an acidic stone powder content threshold as described in any one of claims 1 to 7.

9. A computer-readable storage medium for storing computer program instructions readable by a computer, characterized in that: The computer program instructions are configured to execute, when running, the operations of a hydraulic asphalt concrete performance prediction method based on an acidic stone powder content threshold as described in any one of claims 1 to 7.

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