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Thermal conductive SMA (stone mastic asphalt) asphalt concrete used for electric snow melting asphalt pavement

A technology of asphalt concrete and asphalt pavement, which is applied in the field of road materials, can solve the problems of increasing the amount of asphalt, storage difficulties, and inconvenient construction, and achieves the effect of increasing high temperature stability, improving high temperature stability, and simple construction technology

Inactive Publication Date: 2014-08-27
SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the heat-conducting asphalt concrete used for electric snow melting is mainly mixed with graphite. Although it has certain effects, there are still many problems: (1) the heat-conducting asphalt concrete is not prepared by SMA mixture grading; (2) from It has not been used in electric snow-melting asphalt pavement engineering; (3) Graphite has a high density, and it is easy to segregate after mixing with asphalt, and there are great difficulties in storage; (4) The mixing between graphite and asphalt requires special equipment. The road construction process is increased, which causes inconvenience in construction and increases the construction cost; (5) The distribution of graphite in the mixture produced by graphite asphalt is not uniform, and the heat conduction effect is not ideal; Considering that graphite can replace part of the mineral powder, the amount of asphalt is increased, causing part of the waste

Method used

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  • Thermal conductive SMA (stone mastic asphalt) asphalt concrete used for electric snow melting asphalt pavement
  • Thermal conductive SMA (stone mastic asphalt) asphalt concrete used for electric snow melting asphalt pavement
  • Thermal conductive SMA (stone mastic asphalt) asphalt concrete used for electric snow melting asphalt pavement

Examples

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Effect test

Embodiment example 1

[0026] The heat-conducting SMA asphalt concrete of this embodiment is first prepared graphite asphalt, graphite is added to the heated asphalt; and then the asphalt mixture is produced according to the traditional process. The graphite used replaces 10% of the mass of mineral powder, that is, 1% of the total mass of asphalt mixture is added with graphite; the content of fibers (lignin fiber or modified lignin fiber, carbon fiber) used is 3‰~5‰ of the mass of asphalt concrete; The asphalt used is SBS modified asphalt, and the dosage is 6.5% of the aggregate mass; the graphite used is flaky graphite, and the specific technical indicators are shown in Table 3; the stone used is basalt, and the specific gradation is implemented with reference to SMA-13; The ore powder is limestone, and the synthetic gradation is shown in Table 4.

[0027]

[0028] Table 3 Main properties of graphite

[0029]

[0030] Table 4 Synthesis gradation of SMA-13 ​​mixture

[0031]

[0032] The p...

Embodiment example 2

[0034] The material and amount used in the heat-conducting SMA asphalt concrete in this implementation case are basically the same as those in Case 1, except that no graphite is added. The construction process is as follows: 1) Add fibers to the aggregate (aggregate in mineral aggregate) heated to 180°C~200°C, and stir for 10~15 seconds; 2) Add asphalt heated to 175°C to the mixture and mix 90 seconds; 3) Add mineral powder to the mixture, mix for 90-100 seconds, and then go through the molding process to make heat-conducting SMA asphalt concrete.

Embodiment example 3

[0036] The materials and dosage of the heat-conducting SMA asphalt concrete in this implementation case are the same as those in Case 1. The construction process is as follows: 1) Add fiber and graphite to the aggregate (aggregate in mineral aggregate) heated to 180°C~200°C, and stir 10~15 seconds. 2) Add the asphalt heated to 175°C into the mixture and stir for 90 seconds. 3) Add mineral powder to the mixture, mix again for 90-100 seconds, and then go through the molding process to obtain heat-conducting SMA asphalt concrete.

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Abstract

The invention discloses a thermal conductive SMA (stone mastic asphalt) asphalt concrete used for an electric snow melting asphalt pavement, the thermal conductive SMA asphalt concrete is characterized in that: the mass percentage formula for the thermal conductive SMA asphalt concrete is as follows: 6-6.5% of asphalt, 83-85% of a stone material, 7.5-6.5% of mineral powder, 2-3% of graphite and 0.3%-0.5% of fiber. The thermal conductive SMA asphalt concrete not only meets the performance requirements of SMA asphalt concrete, also has the advantages of good thermal conductivity, high temperature performance and the like, is suitable for electric snow melting asphalt pavement, and can reduce the snow melting energy consumption.

Description

technical field [0001] The invention belongs to the technical field of road materials, and in particular relates to a green and environment-friendly heat-conducting modified asphalt concrete and a preparation method thereof. Background technique [0002] The snowfall period in northern my country is relatively long in winter, for example, the snowfall period in Xinjiang sometimes lasts as long as 6 months. Snow and icing on the road will affect the smooth flow of road traffic and the safety of vehicle operation, especially in urban road sections with large longitudinal slopes, such as on-ramps and on-ramps of elevated roads, which often affect the normal driving of vehicles due to snow. According to relevant statistics, 30% of traffic accidents in winter in my country are caused by snow and ice on roads, causing huge losses to the social economy. At present, the commonly used snow removal methods are mainly divided into the following three types: 1. Manual removal method (l...

Claims

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Application Information

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IPC IPC(8): C04B26/26C04B22/02
Inventor 黄岩张胜叶奋王胜吴怀睿郑杰
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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