Multifunctional pavement overlay structure beneficial to microwave heating

Abstract

The invention discloses a multifunctional pavement overlay structure beneficial to microwave heating. The multifunctional pavement overlay structure comprises a microwave impedance matching layer (1), an asphalt concrete overlay layer (2), a microwave reflection layer (3) and an old cement pavement surface layer (4) from top to bottom in order. Specifically, the microwave impedance matching layer (1) and the asphalt concrete overlay layer (2) form an electromagnetic parameter gradual change structure; the asphalt concrete overlay layer is the main object of microwave heating, and steel slag and carbonyl iron powder are added to change the electromagnetic parameters of an asphalt mixture, so that the microwave impedance matching layer and the overlay layer form the electromagnetic parameter gradual change structure to significantly reduce microwave reflection on the pavement surface in the microwave heating process and enhance microwave loss of the overlay layer, thus enhancing the microwave heating efficiency of the overlay layer overall; the microwave reflection layer is formed by bonding compounding of nonwoven geotextile and aluminized glass fiber fabric, can reflect most of microwave transmitted by the overlay layer back to the overlay layer for re-absorption, thereby significantly improving the microwave utilization and heating efficiency. The overlay structure has the characteristics of high surface microwave transmissivity, strong microwave absorption of the middle overlay layer, and reflection recycling of bottom microwave.

Description

technical field [0001] The invention relates to a functional pavement overlay structure, in particular to a multifunctional pavement overlay structure which is beneficial to microwave heating. Background technique [0002] Since the 1980s, cement concrete pavement has been widely used as an important structural form of highway pavement. With the increase of service time and the sudden increase of traffic volume, the cement concrete pavement has cracked, subsidence, broken, and plate detachment. Pavement diseases of empty and other highways have affected the function of the road, and the old pavement needs to be maintained in time. The overlay technology has a good effect on the repair of pavement diseases, can improve the appearance, smoothness and skid resistance of the pavement, and prolong the service life of the pavement. It is a commonly used measure in the maintenance and reconstruction of old cement concrete pavements. [0003] Functional overlay maintenance technolo...

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Problems solved by technology

Microwave heating has gradually become the mainstream of road heating methods because of its environmental protection, energy saving, and high-efficiency heating characteristics. However, the current efficiency of microwave heating on asphalt pavement is too low, which limits the development and promotion of microwave heating technology.

The main reasons for the low microwave heating efficiency are as follows: 1. Asphalt hardly absorbs microwaves, and mainly relies on aggregates to absorb microwaves to heat asphalt mixture, and the heating effect is too poor; 2. The microwave reflectivity of the asphalt pavement surface is too high , a large part of the microwave emitted by the microwave heating equipment cannot enter the surface layer and be lost; 3. The microwave heating depth of the asphalt pavement is too large, and the heating depth of the 2.45GHz microwave can reach 15-20cm, but in addition to the reflection cracks of the base, it is necessary to carry out The diseases of heating curing generally occur from the surface of the road to 10cm below the surface of the road, thus reducing the efficiency of microwave heating and wasting energy

The above three points are also the reason why the deicing efficiency of microwave heating on the road surface is too low

Adding a certain proportion of microwave absorbers in the mixture, such as dielectric materials, ferromagnetic substances, metal micropowder, etc., can improve the microwave absorption efficiency of the pavement. However, simply adding microwave absorbers is often too high and costs too big

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