Phase change material evaluation method for determining ice and snow removing feasibility of asphalt pavement

A phase change material and asphalt pavement technology, which is applied in the fields of analyzing materials, material thermal analysis, measuring devices, etc., can solve the problems of large influence of human interference, low accuracy, and large randomness, so as to improve the evaluation efficiency and avoid one-sidedness. , the overall effect of evaluation indicators

Pending Publication Date: 2022-04-12
XINGTAI ROAD & BRIDGE CONSTR GENERAL
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems that the current evaluation takes too long, is relatively random, has a large influence of human interference, is not accurate, and cannot quickly and effectively determine whether the phase change material tested can be used for deicing and snowing on asphalt pavement. Now it provides A phase change material evaluation method for determining the feasibility of snow and ice removal on asphalt pavement

Method used

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  • Phase change material evaluation method for determining ice and snow removing feasibility of asphalt pavement
  • Phase change material evaluation method for determining ice and snow removing feasibility of asphalt pavement
  • Phase change material evaluation method for determining ice and snow removing feasibility of asphalt pavement

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specific Embodiment approach 1

[0020] Embodiment 1: A phase change material evaluation method for determining the feasibility of deicing and snow removal from asphalt pavement described in this embodiment includes the following steps:

[0021] Step 1, measuring the thermal conductivity of the phase-change asphalt mixture sample to obtain the thermal conductivity of the phase-change asphalt mixture;

[0022] Step 2: Measure the thermal diffusivity of the phase change asphalt mixture sample based on the principle of unsteady heat conduction of a semi-infinite object, and obtain the thermal diffusivity of the phase change asphalt mixture;

[0023] Step 3: Measure the specific heat capacity of the phase change asphalt mixture sample to obtain the specific heat capacity of the phase change asphalt mixture;

[0024] Step 4: Measure the enthalpy decay rate of the phase change asphalt mixture sample to obtain the enthalpy decay rate of the phase change asphalt mixture;

[0025] Step 5: The thermal conductivity, th...

specific Embodiment approach 2

[0026] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the phase-change asphalt mixture sample described in step 1 is a cylindrical sample of rotational compaction cut into a sample to be tested with a diameter of 150mm and a thickness of 10mm ; The temperature measured for the thermal conductivity is above 0°C; the test instrument is a Hot Disk thermal constant analyzer. Others are the same as the first embodiment.

[0027] This embodiment measures thermal conductivity based on the principle of the transient flat plate heat source method. The phase change material is added during the mixing process of the asphalt mixture, and the rotary compaction method is used to form it. The formed cylindrical specimen was cut into samples to be tested with a diameter of 150 mm and a thickness of 10 mm to ensure that the phase change material was the only variable. Considering the endothermic capacity when the ice and snow are not melted, the initial heating...

specific Embodiment approach 3

[0028] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that: in step 2, the thermal diffusivity of the phase change asphalt mixture sample is determined by placing the phase change asphalt mixture sample in a low temperature and constant temperature test. In the box, the first-order relationship of temperature change with time is T=b 1 t+b 2 , the quadratic relation with depth is T=a 1 z 2 +a 2 z+a 3 , the thermal diffusivity is as follows:

[0029]

[0030] In the formula, a is the thermal diffusivity of the phase change asphalt mixture, T is the temperature of the phase change asphalt mixture, t is the time difference, b 1 , b 2 is the fitting constant of the linear relationship between temperature and time, a 1 , a 2 , a 3 is the fitting constant for the quadratic relationship of temperature versus depth. Others are the same as in the first or second embodiment.

[0031] In this embodiment, considering that ice and snow are locate...

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Abstract

The invention discloses a phase change material evaluation method for determining the ice and snow removal feasibility of an asphalt pavement, and relates to the technical field of asphalt pavement ice and snow removal performance evaluation and phase change material research and development, in particular to the phase change material evaluation method for determining the ice and snow removal feasibility of the asphalt pavement. The method aims at solving the problems that existing evaluation is too long in consumed time, large in randomness, large in man-made interference influence, not high in accuracy and incapable of rapidly and effectively determining whether the tested phase change material can be used for removing ice and snow on the asphalt pavement or not. The method comprises the following steps: 1, measuring a thermal conductivity coefficient; 2, measuring a thermal diffusion coefficient; 3, measuring the specific heat capacity; 4, measuring an enthalpy value attenuation rate; and 5, establishing a comprehensive evaluation system for ice and snow melting of the phase-change asphalt mixture, and further evaluating the ice and snow removing feasibility of the phase-change asphalt mixture. The method is used for determining the ice and snow removing feasibility of the asphalt pavement.

Description

technical field [0001] The invention relates to the technical field of asphalt pavement deicing and snow removal performance evaluation and phase change material research and development, in particular to a phase change material evaluation method for determining the feasibility of asphalt pavement deicing and snow removal. Background technique [0002] With the rapid development of my country's economy and the rapid growth of road traffic, traffic safety has attracted more and more attention from the society. Most areas in my country belong to ice and snow areas. In winter and spring, there will be snow and ice on the road surface, which seriously affects traffic safety and traffic efficiency. According to statistics, traffic accidents caused by snow and icing on roads in my country account for more than 35% of the total traffic accidents in winter. [0003] Among the current methods of removing ice and snow, manual and mechanical removal of snow and ice is time-consuming a...

Claims

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Application Information

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IPC IPC(8): G01N25/00G01D21/02
Inventor 马骅赵东尧李文清苏立超刘杰王中合王庆杰王彦辉李运强米海丽王菲屈江峰李恒达马占旭张帆
Owner XINGTAI ROAD & BRIDGE CONSTR GENERAL
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