Abstract
It has long been recognized that fine aggregate (FA) plays a crucial role in the performance of asphalt mixture, especially for the viscoelastic behavior. In this research, 13 types of FA (1 natural sand, 5 stone chips, and 7 machine-made sands) were selected for investigation. Three indirect indicators (uncompact void content test, flow time test, and standard test method for index of aggregate particle shape and texture ASTM D3398) and three types of direct indicators (form, angularity, and texture) were employed to evaluate the geometric characteristics of FA and conduct comprehensive studies on the indicator system. Meanwhile, the effects of FA geometrical properties on the viscoelastic behavior of asphalt mortar were investigated. The results show that only the form indicator ratio of equivalent ellipse axis (E) and angularity indicator surface parameter (SP) can effectively distinguish different types of fine aggregates. The correlation analysis reveals that the parameters of the four elements in the Burgers model are negatively related to the form index (E) but positively related to the angularity index (SP), while the parameter retardation time ( τ r ) exhibits the opposite. This indicates that the use of less flat-elongated and more angular FA can increase both the overall stiffness and elastic component of asphalt mortar.
Highlights
Mineral aggregates make up more than 80% by volume or 90% by mass of the commonly used paving asphalt mixtures and, according to the particle size, mineral aggregates can be divided into filler (
The indirect tests are based on the measurement of bulk property which is due to the combined effect of form, angularity and texture, and it is fairly difficult to separate the effect of the individual components
By made: comparing the correlations between the geometrical properties of mono-sized and graded can be fine aggregate mixtures, 0.6 mm was suggested as the representative of FA geometrical
Summary
The aggregate geometry has long been recognized to have a significant influence on the volumetric, mechanical, skid-resistant and other properties of asphalt mixtures. CA and FA, and investigate their potential connections to various mixture performances such as skid resistance [3,4,5], microstructure characteristic [6,7,8,9,10], rutting performance [11] and others [12,13]. The existing test methods can be classified into two broad categories, namely, the indirect approach and the direct approach. The former refers to those wherein aggregate geometric
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