Cold-recycling emulsified asphalt step-by-step addition process

Abstract

The invention discloses a cold-recycling emulsified asphalt step-by-step addition process. The process is applied in preparation of a cold-recycling mixed material. The process comprises the following steps: step 1, selecting raw materials, wherein the raw materials comprises 30% to 35% of a recycled asphalt pavement (RAP) material with a particle size of 0 to 5 mm, 20% to 25% of the recycled asphalt pavement (RAP) material with the particle size of 5 to 10 mm, 25% to 28% of the recycled asphalt pavement (RAP) material with the particle size of 10 to 30 mm, 10% to 15% of new aggregate with the particle size of 10 to 30 mm, 2% of mineral powder, 1.5% of cement and 4% of emulsified asphalt, wherein the water content is 3.6%; step 2, weighing the recycled asphalt pavement (RAP) material with the particle size of 10 to 30 mm, adding the new aggregate with the particle size of 10 to 30 mm, adding water, carrying out blending, and adding the emulsified asphalt so as to prepare a prepared material 1; step 3, weighing the recycled asphalt pavement (RAP) material with the particle size of 0 to 5 mm and the recycled asphalt pavement (RAP) material with the particle size of 5 to 10 mm, carrying out mixing, then adding water, the mineral powder and the cement, carrying out blending, and adding the rest of the emulsified asphalt so as to prepare a prepared material 2; and step 4, mixing the prepared material 1 and the prepared material 2 and adding water so as to prepare a mixed material, wherein the usage amounts of the emulsified asphalt in the step 2 and the step 3 are the same; and the usage amounts of the water in the step 2, the step 3 and the step 4 are the same. By using the process provided by the invention, the mixed material is blended more uniformly, has better coating property, and is free of gray and white materials.

Description

technical field [0001] The invention relates to a cold regeneration technology of asphalt pavement. More specifically, the present invention relates to a stepwise addition process of cold recycled emulsified asphalt. Background technique [0002] The design life cycle of asphalt pavement in China is generally 15-20 years, and the asphalt pavement after a period of use needs to be repaired. The emulsified asphalt cold recycling technology refers to the continuous milling and crushing of the old pavement using cold recycling machinery at room temperature. The milling materials and recycled binders are evenly mixed in the mixing building, and then transported to the construction site for subsequent paving, The rolling process is a process of re-forming the surface layer of a low-grade road or the lower layer or base layer of a high-grade road. Emulsified asphalt is one of the commonly used regeneration agents for cold recycling. Emulsified asphalt is the main binder material...

AI Technical Summary

Problems solved by technology

At present, in the in-situ cold recycling technology, the emulsified asphalt is often added at one time, so the mixture is prone to graying, and the performance of the recycled pavement is greatly affected

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