Method for quantitatively expressing interface fusion degree of new asphalt and old asphalt by utilizing nano Fe3O4

Abstract

The invention discloses a method for quantitatively expressing the interface fusion degree of new asphalt and old asphalt by utilizing nano Fe3O4. The method comprises the following steps: step 1, heating matrix asphalt to 150 DEG C, keeping the temperature constant, adding surface-modified nano Fe3O4 powder according to the mixing amount by mass, and stirring for 30 minutes by using a stirrer toform homogeneous tracing asphalt serving as new asphalt, the mass ratio of Fe3O4 to the matrix asphalt being 1: 50; and step 2, respectively heating the new asphalt and the old asphalt to a flowing state, pouring the old asphalt into an aluminum segregation pipe, immediately pouring the new asphalt into the aluminum segregation pipe filled with the old asphalt, and inwards folding the open end ofthe segregation pipe filled with a new asphalt sample and an old asphalt sample for two to three layers to obtain a new asphalt and old asphalt fused penetration test piece.

Description

technical field [0001] The present invention relates to utilizing nano-Fe 3 o 4 The invention relates to a method for quantitatively expressing the fusion degree of old and new asphalt interfaces, belonging to the technical field of asphalt pavement regeneration. Background technique [0002] During the service period of the pavement, the asphalt gradually hardens and becomes brittle under the combined effects of water, light, heat and other external environments, resulting in many pavement diseases such as cracks and potholes, and the pavement has to be renovated and reconstructed. Due to the deepening of the concept of green environmental protection, the non-renewability of petroleum resources, and the high cost of disposal of waste materials, road workers proposed that the waste materials should be crushed and strengthened and put back into the use of asphalt pavement, which can realize the reuse of old materials, but The utilization rate of old materials is not ideal. ...

AI Technical Summary

Problems solved by technology

The conventional method is to compare the changes in penetration value, dynamic viscosity value, complex modulus, etc. of new asphalt, old asphalt and recycled asphalt, or use advanced instruments to observe the functional groups, molecular weight or morphology of new and old asphalt, recycled asphalt To characterize the fusion degree of old and new asphalt, the disadvantages of this method are: (1) the proportion relationship between old and new asphalt in recycled asphalt cannot be accurately known; (2) the component analysis of asphalt requires the inspector to have a chemical background; (3 ) Most of the recycled asphalt is extracted by centrifugation, the operation procedure is complex and lengthy, it contains more impurities, and trichlorethylene is a flammable liquid, which has potential safety hazards

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