A method for detecting the fusion degree of cement emulsified asphalt and old asphalt

Abstract

The present invention is based on the time scanning mode in the dynamic rheometer, and calculates the emulsified asphalt cooling rate by calculating the composite shear modulus of the cement emulsified asphalt / old asphalt double-layer unfused specimen and the cement emulsified asphalt / old asphalt double-layer fused specimen. The fusion degree of recycled mixture cement emulsified asphalt and old asphalt is used to optimize the construction technology and mix ratio design of emulsified asphalt cold recycled mixture, and provide a scientific basis for the optimal design of cold recycled pavement materials based on interface effects, so as to improve the performance of cold recycled pavement. Lay the foundation for performance and applicability.

Description

technical field [0001] The invention relates to the technical field of road engineering asphalt pavement recycling technology, in particular to a method for detecting the fusion degree of cement emulsified asphalt and old asphalt. Background technique [0002] At present, about 200 million tons of waste asphalt mixture (reclaimed asphaltpavement, RAP) are produced in my country's asphalt pavement maintenance every year, which is the most in the world. How to achieve efficient regeneration of RAP has important practical significance for environmental protection, effective utilization of resources, and sustainable development of road surfaces. At present, the utilization rate of RAP in our country is less than 30%, while that of developed countries is as high as 90%. For recycled asphalt mixture, the fusion degree of the new cementitious material and the old asphalt on the RAP surface is one of the most important concerns in the recycling application of waste asphalt mixture,...

AI Technical Summary

Problems solved by technology

Under the action of load, the weak interlayer in the cold recycled asphalt mixture will form fine cracks, which will reduce the road performance of the recycled asphalt mixture

[0006] In addition, as a porous structure material, cement emulsified asphalt mortar has poor resistance to water penetration, and water molecules and H+ can easily enter the adhesive layer between the mortar and RAP from the pores, causing the mortar to peel off easily, resulting in the interface becoming a cold recycled mixed Weak parts of the material

Therefore, it often becomes the origin of microscopic damage, which comes from the microscopic damage and destruction of the interface, connecting and penetrating, and finally leads to the macroscopic destruction of the mixture.

[0007] These test methods such as X-ray scanning electron microscopy, gel chromatography, Fourier transform infrared spectroscopy and transmission electron microscopy in the prior art should have good spatial resolution, and can be used to test polymer-polymer interactions. degree of fusion, but these test methods are difficult and the instruments are expensive

In addition, when testing fusion, heavy elements are generally required for labeling. These tracer molecules may slow down the mass transfer process and affect the fusion process.

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