Influence of Macrotexture and Microtexture on the Skid Resistance of Aggregates

Bowen Guan,Haile Zheng,Jianhong Fang,Huaxin Chen,Jiayu Wu,Chao Xie

doi:10.1155/2018/1437069

Bowen Guan, Haile Zheng + Show 4 more

Open Access

https://doi.org/10.1155/2018/1437069

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Abstract

This article intends to study the influence of macrotexture and microtexture on the skid resistance of four types of aggregates. For this purpose, fractal dimension (D), root mean square height (Rq), and Polished Stone Value (PSV) were tested. The Pearson correlation coefficients between PSV and D or Rq in the interval of different polishing cycles were calculated and analyzed with correlation analysis. The relationships between PSV and Rq were also established. The results showed that the PSV development was approximately divided into 3 stages including accelerated attenuation stage, decelerated attenuation stage, and stabilization stage. There is a critical point of the entire polishing cycles. When the number of the polishing cycles exceeds this critical point, microtexture replaces macrotexture to play a major role in the skid resistance of aggregates. In the accelerated attenuation stage, macrotexture plays a major role in the skid resistance of aggregates. In the decelerated attenuation stage and stabilization stage, microtexture gradually plays a major role in the skid resistance of aggregates. Because of roughest microtexture in the stabilization stage, bauxite can provide the highest levels of skid resistance for high friction surface treatment over the long-term period.

Highlights

High friction surface treatment (HFST) is the application of very high quality aggregate with an epoxy binder, which is designed to improve friction of the pavement in the location with high crashes, such as horizontal curves and intersections
Heitzman et al [4] evaluated the HFST test slabs with eight aggregates including bauxite, granite, flint, basalt, silica sand, steel slag, emery, and taconite under accelerated laboratory polishing and testing procedures. ey found that all eight surfaces maintained predominately greater than 1.0 mm mean profile depth (MPD), and there is no correlation between HFST surface friction and particle shape and angularity
In order to understand the relationship between surface texture and skid resistance of aggregates, the effect of macrotexture and microtexture was quantified, and their contributions to the skid resistance of aggregates were studied in this paper

Summary

Introduction

High friction surface treatment (HFST) is the application of very high quality aggregate with an epoxy binder, which is designed to improve friction of the pavement in the location with high crashes, such as horizontal curves and intersections. Most of the studies have found that macrotexture varies with aggregate geometric properties (shape and size) and microtexture has significant influence on the skid resistance of HFST. Because aggregate in the pavement materials accounts for more than 90%, surface texture of aggregate is important for friction of HFST. In order to understand the relationship between surface texture and skid resistance of aggregates, the effect of macrotexture and microtexture was quantified, and their contributions to the skid resistance of aggregates were studied in this paper

Materials and Methods

Experimental Method

Results and Discussions

80 Decelerated attenuation

Conclusions