Abstract
The morphological characteristics of aggregate include outline shape, angularity, and surface texture, which determine the mutual extrusion and friction between aggregates, and significantly affect the performance of asphalt pavement. At present, the research on the morphological characteristics of coarse aggregate is mainly focused on indoor visual identification technology (AIMS, XCT, etc.), in which the applicability of the proposed aggregate shape characterization index is weak, and these instruments could not serve the practical engineering well. In this article, the Coarse Aggregate Morphological Identification System (CAMIS) is developed based on computer vision technology, and the system can recognize the shape features of aggregates above 2.36 mm particle size and carry out uninterrupted feeding and removal based on the mechanical arm system, which can realize large sample detection. Based on CAMIS aggregate identification system and laboratory tests (rutting test, dynamic modulus test, and penetration shear test), the shape identification and performance test of aggregate samples from construction site are carried out, and an aggregate performance evaluation index, CEI, suitable for high-temperature areas is proposed in combination with the improved response surface method. The processing parameters of vertical shaft impact aggregate crusher are optimized based on the CEI index, and the recommended processing parameters are verified by laboratory tests. The results show that the morphological characteristics of coarse aggregate affect the high temperature performance in order angularity, needle flake, axial coefficient, and convexity. The combination of processing parameters of vertical axis impact crusher is recommended to be of 45 m/s rotational speed, 3 t/h feed quantity, and 30% air intake. Verified by laboratory tests, the aggregate identification system CAMIS developed in this article and the proposed aggregate performance evaluation index, CEI, are highly reliable.
Highlights
The morphological characteristics of aggregate include outline shape, angularity, and surface texture, which are closely related to the formation of asphalt mixture spatial skeleton and the interaction between asphalt and aggregate, significantly affecting the road performance of asphalt mixture (Li et al, 2019)
The above 29 groups of aggregates with different morphological characteristics were used to form rutting specimens, and the automatic rut instrument was used to determine the dynamic stability of asphalt mixture
Dynamic Modulus Test In all the asphalt pavement designs based on mechanical methods, the modulus of asphalt mixture is one of the most
Summary
The morphological characteristics of aggregate include outline shape, angularity, and surface texture, which are closely related to the formation of asphalt mixture spatial skeleton and the interaction between asphalt and aggregate, significantly affecting the road performance of asphalt mixture (Li et al, 2019). Wang et al (2019a) proposed the sphericity, flatness, elongation, angularity, and surface texture index to describe the morphological characteristics of coarse aggregate based on the AIMS experiment instruments. (2) The aggregate of a stone factory in Guangdong Province is selected, and the local aggregate is scanned and tested by using the rapid recognition system of coarse aggregate morphological characteristics, and the ranges of angular value X1, needle-like content X2, axial coefficient X3, and convexity X4 are determined. (4) The gray correlation analysis is used to analyze the impact factor of four coarse aggregate morphological indexes on each response value, and the correlation degree between morphological index and each high temperature performance evaluation index is calculated. (7) the model is constructed; that is, the functional relationship between each coarse aggregate shape index and evaluation index value is established
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