Review of Visualization Technique and Its Application of Road Aggregates Based on Morphological Features

Abstract

The sustainable performance of asphalt pavement depends on the quality and mix design of road aggregates. Identifying aggregate morphology and size is a prerequisite step for material design and numerical modeling of asphalt mixtures. The paper aims to review the morphometric measurement, characteristic parameters and visualization technique of road aggregates. Types, calculation methods and advantages of aggregate morphological characteristics are highlighted. The applications of aggregate morphological features on the volumetric design, compaction processes, mechanical properties and size effect of asphalt mixtures are summarized. Although digital image processing technology has been studied for years, aggregates in the complex accumulation are still difficult to measure accurately. In the current research, the morphological parameters of aggregates remain diverse without a standard protocol. Compared to theoretical models, numerical models have more difficulties establishing irregular morphology features in the simulated specimens but provide a volume parameter closer to the real value. The future investigation of road performance under dynamic loading should account for the microscopic evolution of shape, orientation and distribution of aggregates over time.

Comparison of Different-Energy-Level Abrasion in Los Angeles and Micro-Deval Apparatuses Using Mass Loss and Rounding of Sediment Particles

“…Recently, as dynamic image analysis has been shown to be useful and convenient for particle analysis, it was adopted in numerous studies, such as Buckland et al [36], Guo et al [37], Li and Iskander [38], etc. Visual techniques for morphological analysis are extensively discussed in Wang et al [4]. We used a Microtrac Camsizer XL (the operating scheme is presented in Figure 4), which is a quasi-3D dynamic image analyser used for particle characterization.…”

“…The overall outer appearance of a rock particle (rock clast) can be described at different shape aspect levels [1][2][3][4]. If we observe particles' macro features, their shape aspects can be divided into form and roundness/angularity.…”

Safety and Effect of Fly Ash Content on Mechanical Properties and Microstructure of Green Low-Carbon Concrete

“…The mechanical properties of concrete are affected by many factors, such as temperature and loading ratio [11,12]. Previous studies demonstrated that the reasonable composition ratio of mineral admixtures and recycled aggregates can greatly improve the performance of composite admixtures [13][14][15]. On the one hand, the compaction method and microstructure of concrete are also important factors affecting its performance [16].…”

Effect of Moisture Condition of Structural Lightweight Concretes on Specified Values of Static and Dynamic Modulus of Elasticity

“…Nevertheless, it is the type of aggregate which determines the modulus especially strongly [ 2 , 3 , 4 ]. That is why the relationship between the modulus and compressive strength of concrete is not sufficient without taking into consideration the aggregate type [ 5 , 6 ]. In the case of normal-weight concrete (NWAC), EN-1992-1-1 [ 1 ] considers corrections of a value of modulus of elasticity in terms of aggregate type.…”