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Wear and particle generation of three pavement alternatives, a referenceconcrete, an experimental photocatalytic concrete, and a standardasphalt pavement
VTI Swedish National Road and Transport Research Institute, Sweden.
RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
KTH Royal Institute of Technology, Sweden.
2015 (English)In: Proc of IBRACON, 2015Conference paper, Published paper (Refereed)
Abstract [en]

This study compares the wear and the generation as well as the properties of inhalable wear particles fromdifferent types of pavements; a reference white topping, a white topping modified by a photocatalytic additiveand a standard asphalt. Tests were made using a circular road simulator (CRS) equipped with studded tyresat the Swedish National Road and Transport Research Institute (VTI). In the road simulator the contributionfrom other sources are minimized as the whole test rig and the analysis equipment are kept isolated as avery large cell. The wear is measured directly upon the pavements, and the particles generated aremeasured and analyzed using standard aerosol instrumentation. The generated particles are characterizedby mass concentration of PM10 in air, size distributions and by size segregated element composition. Thereference concrete was the same as used in a 20 km long highway pavement in the central part of Sweden.The photocatalytic modified concrete was based on the same mix, but part of the fines and the cement wasreplaced by a photocatalytic binder product. The asphalt was a SMA 16 with the same rock material as in theconcretes, but with a slightly higher volume fraction. In earlier laboratory tests both concrete blends hadproven to have the same physical properties (compressive strength, flexural strength, elastic modulus,shrinkage, thermal expansion coefficient, frost resistance and abrasive resistance). The results from the testsconducted showed that the photocatalytic white topping concrete had the largest wear and generated mostPM10 particles. The reference concrete wore less than the asphalt, but generated more PM10, which wasattributed to a PM10 contribution from the cement matrix. On the other hand, both the concretes resulted in alower production of ultrafine particles compared to the asphalt pavement. Analysis in microscope of themicrostructure in thin sections showed that the photocatalytic binder structure in this test was more porousand inhomogeneous than the reference concrete’s microstructure.

Place, publisher, year, edition, pages
2015.
Keywords [en]
photocatalytic concrete, asphalt, wear, tyres, particle generation, PM10
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-39890OAI: oai:DiVA.org:ri-39890DiVA, id: diva2:1349147
Conference
57º CONGRESSO BRASILEIRO DO CONCRETO - CBC2015 3rd International Conference of Best practices for Concrete Pavements October 2015
Available from: 2019-09-06 Created: 2019-09-06 Last updated: 2019-09-06Bibliographically approved

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