Dynamic Model of Polished Stone Value Attenuation in Coarse Aggregate

Abstract

The polished stone value (PSV) of coarse aggregate is closely related to pavement skid resistance and traffic safety. However, the determination of the PSV of coarse aggregate is conventionally a time- and energy-intensive process. To facilitate the test process of PSV in materials selection and pavement design and for the prediction of the service life of aggregate materials in practical service, here a new mathematical model of PSV attenuation in coarse aggregate, which employs a physical polishing process analysis, is proposed. The PSVs of four types of coarse aggregates (calcined bauxite, granite, basalt, and limestone) were analyzed through a polishing experiment, and the corresponding mechanism was investigated via scanning electron microscopy analysis. The modeling results are in good agreement with experimental results. The aggregate PSV is affected by both the macrotexture and microtexture of the aggregate surface. The PSV due to the macrotexture exhibits a strong negative correlation with the Vickers hardness of the aggregates and decreases exponentially as the polishing time increases. The attenuation rate decreases as the fractal box dimension in the aggregate surface morphology increases. The primary factor influencing the macrotexture service life and the half-life is the aggregate surface morphology. The PSV due to the microtexture exhibits a strong positive correlation with the Vickers hardness of the aggregates, whereas there is a poor correlation with the aggregate surface morphology and polishing time. The proportion of the aggregate PSV due to the microtexture increases as the aggregate hardness increases. These results highlight the effectiveness of a new modeling approach that may potentially assist in predicting the anti-slip performance and durability of coarse aggregates.

Comparative Analysis of Slip Resistance Test Methods for Granite Floors

“…Comparing these results to the criteria developed by the UK Slip Resistance Group [ 2 ], it can be concluded that an SRV ≥ 36, which is taken as an indicator of low slip risk ( Figure 2 ), was achieved in dry conditions by all the tested solutions. The SRV depended on the type of treatment texture [ 21 , 22 ]. The lowest SRV value was obtained for PO with Ra equal to 1.85 μm (60 units), followed by PL with Ra equal to 25.9 μm (77 units) and SZ with Ra equal to 27.1 μm (93 units).…”

“…Materials 2021, 14, x FOR PEER REVIEW 8 was achieved in dry conditions by all the tested solutions. The SRV depended on the of treatment texture [21,22]. The lowest SRV value was obtained for PO with Ra equ 1.85 μm (60 units), followed by PL with Ra equal to 25.9 μm (77 units) and SZ wit equal to 27.1 μm (93 units).…”

Mechanical properties, corrosion resistance, and anti‐adherence characterization of pure titanium fabricated by casting, milling, and selective laser melting

“…During the SLM process, titanium powder melted and solidified quickly, which might lead to the generation of finer‐grained structures. Hardness is not a simple physical concept, but a comprehensive index of the mechanical properties of materials, such as elasticity, plasticity, strength, and toughness 37 . The results of this study showed that the SLM group had higher hardness than the casting and milling groups.…”

Laboratory and Field Performance Evaluation of High-Workability Ultra-Thin Asphalt Overlays

“…It can be seen that after a period of operation, the BPN of the test roads all showed a significant decrease, indicating that their skid resistance had been reduced. With the operation of the test roads, the exposure of the vehicle tires to the aggregates acts as a polishing and abrasion effect on the aggregates of the pavement [ 33 ]. As a result, the abundant texture of the pavement surface was gradually worn away during operation, resulting in a gradual decline in skid resistance.…”