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Shape-stabilized phase-change heat-storage cooling pavement material suitable for high-temperature area

A technology of shape-setting phase change and pavement materials, which is applied to cohesive pavement paved on site, roads, roads, etc., and can solve the problem of unexplained dynamic stability, strength and other road performance of asphalt mixtures, which affect phase change asphalt mixtures. Work performance, not suitable for large-scale production and application, etc., to solve the problem of high temperature rutting, reduce temperature sensitivity, and good heat insulation

Active Publication Date: 2017-07-18
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN101029216A "A self-regulating road phase change material and its production method" proposes a kind of fatty acid, potassium sulfate, chitosan, polyacrylamide, floating beads, brucite, pyrophyllite, silicone emulsion, A phase-change material composed of ten kinds of paraffin and sodium hydroxide in a certain mass ratio. The temperature adjustment mechanism is theoretically analyzed, but how to apply it to roads is not mentioned.
It adopts sol-gel method to prepare phase-change composite materials, which has a long preparation period and stress relaxation. The phase-change material carrier is silica, but its retention rate is low and leakage rate is high, which is not suitable for large-scale production and application.
The phase change materials made of the above two materials are not effectively packaged, and the phase change materials are prone to leakage, which greatly affects the working performance of the phase change asphalt mixture.
In addition, the above two patents do not elaborate on the road performance requirements such as dynamic stability and strength of asphalt mixture mixed with shape-changing materials.

Method used

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  • Shape-stabilized phase-change heat-storage cooling pavement material suitable for high-temperature area
  • Shape-stabilized phase-change heat-storage cooling pavement material suitable for high-temperature area

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Experimental program
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Effect test

Embodiment 1

[0030] The shape-setting phase-change thermal insulation and cooling material is composed of the following materials: coarse aggregate 70%, fine aggregate 10%, mineral powder 9%, binary shape-setting composite phase change material 5.7%, asphalt 4.9%, fiber 0.4%

[0031] The coarse aggregate and the fine aggregate are limestone, the binary shape-setting composite phase change material is stearic acid+palmitic acid / expanded perlite, the asphalt is 70# matrix asphalt, the mineral powder is limestone powder, and the fiber is Basalt fiber

[0032] The preparation method of the binary shape-setting composite phase-change material is as follows: the expanded perlite is placed in a drying box to dry for 5 hours, and the phase-change material, the mineral-based Put it into an Erlenmeyer flask, place it in a magnetic stirring pot, and keep stirring in a water bath at 90°C. After 30 minutes, the circulating water vacuum pump was turned on, and the pressure in the Erlenmeyer flask was e...

Embodiment 2

[0037] The shape-setting phase change heat insulation and cooling material is composed of the following materials: 70% coarse aggregate, 9% fine aggregate, 9% mineral powder, 6.7% binary shape-setting composite phase change material, 4.9% asphalt, and 0.4% fiber

[0038] Coarse aggregate and fine aggregate are limestone: the binary shape-setting composite phase change material is stearic acid+palmitic acid / expanded perlite, the asphalt is 70# matrix asphalt, the mineral powder is limestone powder, and the fiber is Basalt fiber

[0039] The preparation method of the binary shape-setting composite phase-change material is as follows: the expanded perlite is placed in a drying box to dry for 5 hours, and the phase-change material, the mineral-based Put it into an Erlenmeyer flask, place it in a magnetic stirring pot, and keep stirring in a water bath at 90°C. After 30 minutes, the circulating water vacuum pump was turned on, and the pressure in the Erlenmeyer flask was evacuated...

Embodiment 3

[0045] The shape-setting phase-change thermal insulation and cooling material is composed of the following materials: coarse aggregate 70%, fine aggregate 9%, mineral powder 8.5%, binary shape-setting composite phase change material 7.2%, asphalt 4.9%, fiber 0.4%

[0046] Coarse aggregate and fine aggregate are limestone: the binary shape-setting composite phase change material is stearic acid+palmitic acid / expanded perlite, the asphalt is 70# matrix asphalt, the mineral powder is limestone powder, and the fiber is Basalt fiber

[0047] The preparation method of the binary shape-setting composite phase-change material is as follows: the expanded perlite is placed in a drying box to dry for 5 hours, and the phase-change material, the mineral-based Put it into an Erlenmeyer flask, place it in a magnetic stirring pot, and keep stirring in a water bath at 90°C. After 30 minutes, the circulating water vacuum pump was turned on, and the pressure in the Erlenmeyer flask was evacuated ...

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Abstract

The invention relates to a preparation method and application method of a shape-stabilized phase-change heat-storage cooling pavement material suitable for a high-temperature area. The method is characterized in that a shape-stabilized phase-change material is prepared from stearic acid, palmitic acid and expanded perlite at the ratio of 2:3:2.5 by adopting a vacuum impregnation method. The application method of the shape-stabilized phase-change heat-storage cooling pavement material is a design method of mixing the shape-stabilized phase-change material into an asphalt mixture and adopting asphalt mastic as the mixture. The prepared shape-stabilized phase-change heat-storage cooling pavement material suitable for the high-temperature area has good cooling and heat-insulating properties, the phase change temperature is 52.8 DEG C, the phase change enthalpy can reach 132J / g, the pavement temperature can be reduced to 4.4 DEG C and the problem of an asphalt pavement track in the high-temperature area can be effectively solved.

Description

technical field [0001] The invention relates to a preparation method and an application method of a fixed-shape phase-change heat storage and cooling pavement material suitable for high-temperature regions. Background technique [0002] Asphalt pavement has been widely used due to its good flatness, comfort, low noise, comfortable driving, wear resistance, and easy maintenance. In my country's high-grade pavement, asphalt pavement occupies as high as 90%. However, asphalt mixture is a viscoelastic material whose shear strength and cohesion decrease significantly with increasing temperature. The high temperature is common in summer in my country, and asphalt can easily reach the softening point, leading to high temperature instability and damage, of which rutting is the main damage form. Most of the existing solutions are "passive" measures such as the use of modified asphalt and the use of skeleton-type aggregate gradation, which not only greatly increases the cost, but al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/08C04B26/26E01C7/26
CPCC04B26/26C04B40/0039C04B2111/0075E01C7/26C04B14/18C04B24/08C04B14/02C04B18/12C04B14/46
Inventor 金娇林飞鹏刘若华郑健龙钱国平黄存波
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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