Preparation method for emulsified bitumen cold-recycled mixture based on internal friction angle

Abstract

The invention discloses a preparation method for an emulsified bitumen cold-recycled mixture based on an internal friction angle. The method comprises the following steps: adjusting the grading of recycled materials according to a recommended grading range; determining optimum water content and maximum dry density according to geotechnical compaction tests of a recycled mixture; molding a test piece under the condition of the optimum water content, subjecting the test piece to maintenance and determining the optimum usage amount of emulsified bitumen by using the internal friction angle acquired through a triaxial compression test; determining whether splitting strength meets design requirements by carrying out wet and dry splitting tests on the basis of the optimum usage amount of emulsified bitumen; and determining the proportion of the emulsified bitumen cold-recycled mixture according to the determined grading of the recycled materials, the optimum water content and the optimum usage amount of emulsified bitumen and testing the performance of the mixture. Compared with conventional designing method for emulsified bitumen mixtures based on dry and wet splitting strength, the method provided by the invention better handles the problem of permanent deformation or shear failure caused by shearing strain in usage of the emulsified bitumen mixture while taking the tensile strength of the materials into consideration.

Description

technical field [0001] The invention belongs to the field of road engineering, in particular to a method for preparing emulsified asphalt cold recycled mixture based on internal friction angle. Background technique [0002] Cold recycling of emulsified asphalt is one of the commonly used technologies for cold recycling of asphalt road materials. It can give full play to the residual value of old pavement materials and is in line with the trend of low-carbon and environmental protection. The design method of emulsified asphalt cold recycled mixture widely used at present is based on the design method of dry-wet splitting strength index, which fully considers the flexural and tensile properties of emulsified asphalt mixture, but this method also has its limitations: emulsification is not fully considered The shear resistance of asphalt mixture, and with the continuous increase of traffic volume and the continuous elevation of emulsified asphalt cold recycled mixture layer, the...

AI Technical Summary

Problems solved by technology

The design method of emulsified asphalt cold recycled mixture widely used at present is based on the design method of dry-wet splitting strength index, which fully considers the flexural and tensile properties of emulsified asphalt mixture, but this method also has its limitations: emulsification is not fully considered The shear resistance of asphalt mixture, and with the continuous increase of traffic volume and the continuous elevation of emulsified asphalt cold recycled mixture layer, the permanent deformation caused by the continuous accumulation of shear strain is the current emulsified asphalt cold recycled mixture One of the most important forms of damage during use

Therefore, the limitations of the existing design methods make it impossible to fully guarantee the service performance of the emulsified asphalt mixture

Images