Bituminous mixture grading estimation method through cold charge monitoring

Abstract

The invention discloses a bituminous mixture grading estimation method through cold charge monitoring. The method comprises the steps that an appropriate camera is selected; the position of the cameraand the intensity of an LED light source are adjusted; digital images used for analysis are determined; MATLAB is utilized to convert the color images into binary images; the distance between the binary images is calibrated; stone particles are virtually screened; the volume of aggregate particles is estimated; the aggregate passing rate is calculated; multiple levels of cold charge grading are determined; and the grading of a bituminous mixture in a stirring pot is estimated based on all levels of cold charge grading in combination with cold charge bin flow. Due to the fact that the fallingdistance of cold charge bin particles is small, the method cannot give rise to dust; the additionally installed LED light source can overcome the non-uniformity problem of natural light; the shot images are clear and continuous, and therefore cold charge grading can be accurately monitored; and meanwhile, on the basis of accurately monitoring the cold charge grading, the grading of the bituminousmixture can be estimated in combination with the flow of all cold charge bins, and the method can be applied to construction process control of the bituminous mixture.

Description

technical field [0001] The invention belongs to the technical field of asphalt pavement construction control, and relates to an asphalt mixture gradation method, more specifically, to a method for estimating the asphalt mixture gradation through cold material monitoring. Background technique [0002] One of the main purposes of asphalt mix ratio design is to give the mineral aggregate gradation that meets the design requirements. The gradation of asphalt mixture seriously affects the high temperature, low temperature, fatigue and water stability of asphalt pavement. Based on laboratory tests, asphalt mix ratio designers can design mineral aggregate gradations that meet the requirements. However, in the construction process of asphalt pavement, due to the variability of aggregate production, the gradation of cold aggregates in each grade is inevitable. There will be variation, which will affect the gradation of the finished asphalt mixture. When the gradation variation of th...

AI Technical Summary

Problems solved by technology

In terms of road engineering, digital image processing technology has been used to measure the gradation of compacted asphalt mixture and estimate the gradation of asphalt mixture, but it belongs to the post-event asphalt mixture gradation control and cannot be used in the construction process of asphalt mixture control

In addition, existing studies have used digital image processing technology to determine the gradation of the hot silo, and then estimate the gradation of each tray of asphalt mixture. It is difficult to come; the hot material bin adopts a vibrating screen, and there is a lot of dust, which is easy to contaminate the lens, blur the lens, and the captured image is noisy, which makes it difficult to carry out digital image processing; extremely difficult

[0008] In summary, asphalt mixture gradation control is of great significance to ensure the road performance of asphalt mixture; my country's "Technical Specifications for Highway Asphalt Pavement Construction" (JTG F40-2004) stipulates that the gradation monitoring method has certain defects; due to the monitoring environment It is difficult to guarantee the accuracy and continuity of monitoring the gradation of hot silos by using digital image processing technology

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