Method for detecting and evaluating distribution uniformity of bituminous pavement aggregate

Abstract

The invention relates to a method for detecting and evaluating the distribution uniformity of a bituminous pavement aggregate. The method comprises the following steps: collecting texture images on a bituminous pavement of a detected road section by an independently developed image collection device; treating pavement images by using an MATLAB self-compiled program to obtain a pavement macroscopic structure width index K as a distribution uniformity evaluation criterion of the bituminous pavement aggregate; judging the distribution uniformity of the pavement of the detected road section; then drilling a density representativeness chip sample on the detected road section; analyzing CT cross-sectional images of the representativeness chip sample through an improved iterative threshold segmentation algorithm; calculating horizontal uniform coefficient DH of a coarse aggregate and the vertical nonuniform coefficients DV1 and DV2 of the coarse aggregate to evaluate the distribution uniformity of the aggregate inside the pavement structure. According to the method, the distribution condition of the aggregate is evaluated in terms of pavement and interior, the disadvantage that bituminous pavement construction uniformity detection indexes lack in an existing pavement quality acceptance system of our country is recovered, and certain reference bases are provided for detection and evaluation of the distribution uniformity of the bituminous pavement aggregate.

Description

technical field [0001] The invention belongs to the application field of evaluating the uniformity of asphalt pavement construction, and in particular relates to a method for detecting and evaluating the distribution uniformity of asphalt pavement aggregates. Background technique [0002] Ensuring uniform and stable quality is the most important principle of any structure and material design, and non-uniformity is the phenomenon of uneven and unstable quality in local areas of asphalt pavement. Under the action of traffic load and natural factors, the non-uniform parts first appear local damage, and then develop into larger area damage, such as looseness and potholes caused by local segregation, poor gradation of local road sections or insufficient compaction. ruts etc. Inhomogeneity has become the main cause of early disease of asphalt pavement. Due to the lack of evaluation indicators related to the uniformity of pavement material distribution, the construction uniformit...

AI Technical Summary

Problems solved by technology

However, although the mineral aggregate gradation obtained by the combustion method or the extraction method can reflect the difference between the gradation composition and the design gradation of the aggregates in the asphalt mixture, it cannot reflect the spatial arrangement of the aggregates in the mixture.

However, when evaluating the aggregate segregation of the pavement using the structural depth index obtained by the sand-laying method, it only starts from the surface of the pavement and fails to reflect the segregation of the aggregate inside the pavement.

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