Abstract
Since the roller-compacted concrete pavement (RCCP) is almost smooth due to roller vibrations in the construction process, the lack of macro-texture prevents it from being used as a final surface. This study has made efforts to improve the RCCP by proposing different scenarios to create new micro-/macro-texture surfaces and investigate their durability and skid resistance under traffic abrasion conditions. To prepare the micro-texture, eight RCCP specimens were cast using various 50–50% mixing proportions, and each of them alone in the form of siliceous and calcareous fine aggregates (natural and manufactured). For the macro-texture, each specimen was textured using such methods as seeding (three cases), stamping (two cases), and brooming (two cases). Since the durable texture should withstand the abrasive traffic flow, the RCCP-surface abrasion resistance was measured by the simulation method proposed in ASTM C944, and their skid resistance was evaluated by measuring the British pendulum test according to ASTM E303 before and after abrasion. The results showed that abrasion resistance of RCCP samples to changes in mixing design and skid resistance to changes in macro-texture have significant changes. In addition, different siliceous-calcareous sand combinations not only made the concrete mix more economical but also improved its performance in case of abrasion and skid resistance. The more was the manufactured sand proportion, the higher the fracture rate was and, hence, the abrasion resistance. Different macro-textures created on RCCP specimens generally showed acceptable skid resistance. In this regard, stamping had the highest mean texture depth (MTD) as well as BPN, and seeding had the lowest.
Highlights
The abrasion resistance of different mixes was inspected visually by checking the effects of different mixing proportions versus different macro-textures and measured based on the mass lost with mean texture depth (MTD) during the abrasion test
The British pendulum number (BPN) results for different fine aggregates to investigate the effect of micro-texture on roller-compacted concrete pavement (RCCP) skid resistance, as well as the effect of different macro-textures, before and after abrasion test are presented In Figure 17
The hypothesis is that the BPN is dependent only on surface micro-texture and represents low-speed friction [52]
Summary
The roller-compacted concrete pavement (RCCP) is more cost-effective than the conventional type (PCC) due to its construction simplicity and less expensive than the asphalt pavement. Rollers smooth the RCCP surface, omit the macro-texture, and increase the hydroplaning and accident potential. For a satisfactory riding quality, the pavement surface should maintain its proper texture and skid resistance which, according to ACI, is affected by both the concrete micro-texture (provided by the fine aggregate type/hardness) and the macrotexture (formed on freshly placed or cut in hardened concrete [1]). Macro-textures provide mechanical resistance against skidding, while micro ones highly affect the frictional resistance against the vehicle tires [2]; both are essential for safe driving on concrete pavements
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