Moderna betongbeläggningar: utveckling mot mindre slitage och partikelemission

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Lars Kraft
Ulf Olofsson

Road paving of concrete has the potential to be an interesting alternative to asphalt in several ways. Concrete is normally durable and lacks fossil components, which is favorable from a climate point of view and for fire safety in e.g. tunnels. However, concrete is more expensive to lay, which means that from a sustainability perspective, the concrete must be both more durable and require less maintenance compared to asphalt coatings. The purpose of the present project has been to develop a concrete recipe (Concrete 2), with better properties regarding wear and particle emissions compared to a known standard concrete (Concrete 1) and a durable asphalt coating (SMA16) based on the same ballast material. Initial pin-on-disk machine tests showed that abrasion and particle concentration of concrete road materials exhibit a reversed proportionality to the hardness of the ballast, and a direct proportionality to the slip distance.

In VTI’s road simulator, Concrete 2 (the new recipe) was compared to Concrete 1 and against an asphalt of the type SMA16. The test showed that the wear was significantly lower for Concrete 2 compared to ABS16 and Concrete 1. Generally, both the concretes generate higher PM10 levels than the asphalt. Ultrafine particles are generated to a greater extent by the asphalt. The reason for the higher PM10 emission of the concrete is considered to be the contribution from the cement paste, which is reflected in an approximately three times higher calcium content in PM10 from the concrete compared to PM10 from the asphalt. Overall, both the test in road simulator and in the detailed studies in the pin-on-disc machine show that Concrete 2 has a higher wear resistance than both Concrete 1 and the asphalt SMA16 and generally generates less PM10 than Concrete 1.

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