CN-121997599-A - Method for estimating snow melting duration of snow melting asphalt mixture

Abstract

The invention provides a method for estimating the snow melting duration of a snow melting asphalt mixture, which is characterized by comprising the following steps of (1) estimating a model data acquisition method and conditions, (2) establishing a mass relation between conductivity and a current solution salt snow melting agent, (3) calculating the mass of the residual salt snow melting agent at each time point, (4) calculating the mass ratio of the residual salt snow melting agent at each time point, (5) establishing an estimation model, and (6) estimating the release time of the salt snow melting agent. The prediction method provided by the invention can effectively predict the release duration of the snow melting material in the snow melting asphalt mixture, and provides support for the prediction of the snow removing effect of the snow melting asphalt pavement.

Inventors

• BU HAILING
• WANG PENG
• LAI JINGXIAO
• WANG QIAN
• KANG YI
• ZHOU XIAOGUANG
• ZHAO JING
• LV QIQI
• WANG YUE
• WANG ZHEN
• LI XIAOHUA
• XU XIN
• YANG YANSHENG
• SUN HAIJIAO
• WANG ZHE
• SHA CHUAN
• ZHANG MINGHAO

Assignees

• 北京市政路桥建材集团有限公司
• 北京市政路桥股份有限公司
• 北京市政路桥正达道路科技有限公司
• 北京路新沥青混凝土有限公司

Dates

Publication Date

20260508

Application Date

20260128

Priority Date

20260113

Claims (8)

1. 1. A method for estimating the snow melting duration of a snow melting asphalt mixture containing a salt snow melting agent comprises the following steps: (1) Method for acquiring pre-estimated model data (2) Establishing the mass relation between the conductivity and the salt snow-melting agent of the current solution (3) Calculating the mass of the residual salt snow-melting agent at each time point (4) Calculating the mass ratio of the residual salt snow-melting agent at each time point (5) Establishing a pre-estimated model (6) Estimating the release time of a salt-type snow-melting agent The method for acquiring the pre-estimated model data comprises the following steps: (11) Soaking a formed standard Marshall test piece of the snow-melting asphalt mixture containing the salt-melting agent in water with a set temperature for a fixed time interval, taking out soaking liquid at time t, measuring the conductivity of the soaking liquid, recording, continuously soaking by changing fresh water, measuring the conductivity and changing the fresh water after the same time interval, and repeating the steps for a plurality of times; (12) According to the Fick's first law, the mass ratio and time of the residual salt snow-melting agent in the asphalt mixture test piece follow exponential decay, and then the mass ratio exponential decay model of the residual salt snow-melting agent is as follows: Wherein: M (t) mass of salt snow-melting agent remained in test piece at time t M 0 mass of initial salt snow-melting agent K: comprehensive precipitation rate constant T is time The step of establishing the mass relation between the conductivity and the salt snow-melting agent of the current solution is as follows: (21) Preparing standard solution of salt-type snow-melting agent Determining the concentration range of the standard solution according to the solubility of the salt snow-melting agent, and calculating the mass, dilution volume and theoretical concentration of the salt; (22) Establishing a concentration-conductivity standard curve A. calibrating a conductivity meter; b. Under the constant temperature environment, measuring and recording the conductivity D sequentially from low concentration to high concentration; c. linear fitting of the data gives a relationship between concentration C and conductivity D, c=g%d+h Wherein g and h are constants fitted; (23) Calculating the precipitation quality of the salt-type snow-melting agent A. According to the method of (11), measuring the conductivity of the snow-melting asphalt mixture soaking solution, recording the conductivity value and the measurement temperature, wherein the constant temperature environment temperature is generally 25.0+/-0.2 ℃, B. Calculating the concentration Calculating the concentration of the solution corresponding to the measured conductivity by using a standard curve equation of the salt snow-melting agent, wherein the relation between the concentration C and the conductivity D is C=ghD+h; c. Calculating the mass of the salt snow-melting agent m=C×V Wherein: m is the precipitation quality of the salt snow-melting agent Concentration of solution V soaking solution volume The step (3) of calculating the mass of the residual salt snow-melting agent at each time point comprises the following steps: Wherein: M (t) mass of salt snow-melting agent remained in test piece at time t M 0 mass of initial salt snow-melting agent M (t) the mass of the salt snow-melting agent precipitated on the test piece at time t The step (4) of calculating the mass ratio of the residual salt snow-melting agent at each time point is as follows: Wherein: y (t) mass ratio of residual salt snow-melting agent in test piece at time t M (t) mass of salt snow-melting agent remained in test piece at time t M 0 mass of initial salt snow-melting agent The step of establishing the pre-estimated model is as follows: Drawing a relation diagram of y (t) and time t, and performing exponential fitting to obtain a relation model of the mass ratio y (t) of the residual salt snow-melting agent and time t, wherein a fitting formula R 2 is required to be more than 0.97, and a pre-estimated model is obtained as follows: Wherein: y (t) mass ratio of residual salt snow-melting agent A, decay constant of residual salt snow-melting agent K: comprehensive precipitation rate constant T is time The step of estimating the release time of the salt-type snow-melting agent in the step (6) is as follows: The time required by the mass ratio of the expected target residual salt snow-melting agent can be estimated through the estimated model, the conversion is carried out by combining the duration time t Rain cover of the rainy season in one year of the actual engineering application area, the estimated model is calculated for t, and the duration time of the snow-melting effect of the snow-melting asphalt mixture is t/t Rain cover =N years.
2. 2. The method of claim 1, wherein the standard solution configuration takes at least 5 concentration points in (21).
3. 3. The method of claim 1, wherein the constant temperature environment temperature is not within a required range, and the temperature compensation is performed on the conductivity by keeping the constant temperature environment temperature within a small fluctuation range, and the conductivity temperature compensation method is as follows: Wherein: D t , conductivity measured at temperature t ℃; d 25 conductivity values compensated to 25 ℃; alpha is the temperature compensation coefficient of the salt snow-melting agent solution, The temperature compensation coefficient alpha of the salt snowmelt agent solution is measured through different temperature experiments.
4. 4. The method of claim 1, wherein in (22), the conductivity is measured 3 times per concentration and averaged.
5. 5. The method of claim 4, wherein in (23), the conductivity of the soaking solution is measured at least at 10 time points of 9 consecutive intervals, and the conductivity is measured 3 times at each time point, and the average value is obtained.
6. 6. The method of claim 1, wherein the step (4) is followed by a step of judging whether the model is established, the method of judging whether the model is established is that taking the logarithm of y (t), drawing a relationship diagram of lny (t) and time t, performing linear fitting, if the linear relationship is established and R 2 is more than 0.97, indicating that the mass ratio of the residual salt-based snow-melting agent is established in an exponential decay relationship with time, otherwise restarting from the step (1).
7. 7. The method of claim 1, wherein the salt is an organic salt.
8. 8. The method of claim 7, wherein the organic salt is sodium formate.

Description

Method for estimating snow melting duration of snow melting asphalt mixture Technical Field The invention relates to a method for estimating snow melting duration of a snow melting asphalt mixture, and belongs to the technical field of highway asphalt pavement design. Background The anti-icing and snow-melting asphalt mixture is a functional pavement material which can actively inhibit icing of a pavement by adding salts or other snow-melting components into an asphalt material. In recent years, the material is popularized and applied in the scenes of roads, bridge decks, airport runways and the like in cold areas, and has remarkable significance in improving the driving safety in winter and reducing the manual and mechanical deicing cost. However, most of the existing research and engineering practice focuses on the initial snow melting performance of materials, and a clear method is lacking in the prediction of the long-term service performance of the materials. In the practical environment, the anti-icing component is continuously separated out and consumed under the multi-factor coupling effects of rainwater infiltration, traffic load, freeze thawing cycle, sunlight aging and the like, and the gradual degradation of the ice melting performance can be caused. Meanwhile, the dissolution of salt substances can influence the framework structure of the mixture, and a series of durability problems such as reduced adhesion between asphalt and aggregate, changed porosity, reduced anti-slip performance and the like are caused. If the long-acting performance is insufficient, the material can fail in advance, so that economic benefit loss is caused, and potential safety hazards are buried due to unstable anti-icing capability of the pavement in winter. Therefore, a scientific snow melting duration prediction method is established, and the method has important significance for optimizing material design, predicting service life and guiding maintenance decision. Only through the experiment verification of the duration time of snow melting, the reliable and stable function of the material in the whole life cycle can be ensured, and the dual benefits of safety and economy are truly realized. Disclosure of Invention The invention aims to provide a method for estimating the snow melting duration of a snow melting asphalt mixture containing a salt snow melting agent, which solves the problem of estimating the sustainable time of the anti-icing and snow melting effects of the snow melting asphalt mixture. A method for estimating the snow melting duration of a snow melting asphalt mixture containing a salt snow melting agent comprises the following steps: (1) Method for acquiring pre-estimated model data (2) Establishing the relation between the conductivity and the mass of the salt in the current solution (3) Calculating the mass of the residual salt at each time point (4) Calculating the mass ratio of the residual salt at each time point (5) Establishing a pre-estimated model (6) Estimating the release time of salts The method for acquiring the pre-estimated model data comprises the following steps: (11) Soaking a formed standard Marshall test piece of the snow-melting asphalt mixture containing the salt-melting agent in water with a set temperature for a fixed time interval, taking out soaking liquid at time t, measuring the conductivity of the soaking liquid, recording, continuously soaking by changing fresh water, measuring the conductivity and changing the fresh water after the same time interval, and repeating the steps for a plurality of times; (12) According to the Fick's first law, the mass ratio of the residual salt snow-melting agent in the asphalt mixture test piece and the time relation follow exponential decay, and then the mass ratio exponential decay model of the residual salt snow-melting agent is as follows: Wherein: M (t) mass of salt snow-melting agent remained in test piece at time t M 0 mass of initial salt snow-melting agent K: comprehensive precipitation rate constant T is time The step of establishing the mass relation between the conductivity and the salt snow-melting agent of the current solution is as follows: (21) Preparing standard solution of salt-type snow-melting agent Determining the concentration range of the standard solution according to the solubility of the salt snow-melting agent, and calculating the mass, dilution volume and theoretical concentration of the salt snow-melting agent; (22) Establishing a concentration-conductivity standard curve A. calibrating a conductivity meter; b. Under the constant temperature environment, measuring and recording the conductivity D sequentially from low concentration to high concentration; c. linear fitting of the data gives a relationship between concentration C and conductivity D, c=g%d+h Wherein g and h are constants fitted; (23) Calculating the precipitation quality of the salt-type snow-melting agent A. According to the method of (11), measu