I came upon a real planning case, where a small street with a max speed of 30 km/h requires a complete makeover. The existing cobble stones can either be replaced by new ones or by asphalt. Some aspects beside, like historic ambience, noise emissions, or rainwater infiltration, which alternative would have which global warming potential (GWP), roughly estimated?
In my search for an answer I first found the publication of Santero and Horvath (2009) regarding the "Global warming potential of pavements". Following its citations I came across several publications about asphalt, concrete, and their respective innovations, also regarding their GWP. I even came across a paper by Lo Presti and D'Angelo (2017) regarding their "Review and comparison of freely-available tools for pavement carbon footprinting in Europe". However, I did not find any comparison between asphalt and cobblestone. Probably because the latter does not play a major role for today's streets. Suggestions are welcome!
If the Indonesian National Satandar and British Standard specifications are not permitted to use round stone, if indeed forced to use round stone it must be tested first with a mix design and then marshall characteristics are tested. If you really need road pavement that GWP uses asphalt porous, because this construction besides minimizing noise can also absorb heat. That is my suggestion.
Dear Rais, thank you very much for your suggestion. However, I do not think it applies really well to the European, respectively German context.
Regarding the global warming potential (GWP) I refer to the emissions of CO2e during the life cycle of the street (construction, maintenance, renewal). I agree, the absorption of heat and reflection of sunshine is very important for the micro-climate on and around the street, e.g., for the heat island effect in cities, but in my case I am only interested in the GWP. Nonetheless, thank you again, because I hope through this reply, I could clarify my initial question for others as well.
Best Regards, Daniel
Dear Ammad Hassan Khan , I am not sure I understand your suggestion. Could you please elaborate, what you would like to contribute with "Asphlat"? Thanks and Best Regards
Dear Daniel, I only research about materials used for road construction. For the following research, I will try to examine the effect of global warming on the viscosity of asphalt in the aggregate. Thank you for your idea and best regards.
Rais Rachman, Christian Indonesia Paulus University, Makassar, South Sulawesi, Indonesia
Did you consider old cobblestone from another, previously demolished roads? For this kind of low-traffic volume and low speed roads around historical sections of the city we often use old (e.g. granite) elements. Personally I think that cobblestone pavements (old or new) are more enviromental friendly than asphalt pavements mainly because life cycle of this surface will exceed asphalt one. You can surely find granite pavements older than 100 years and they rarely need any extended rehabilitation treatment. Ofc I'm talking about low speed and low traffic volume roads. Cobblestone also helps to reduce car speed without any additional dedicated solutions.
Dear Mateusz, thanks for your question. No, I did not consider reusing old cobblestone from another, previously demolished road. I am not that much involved in the technical planning, but I would definitely suggest this idea to the planners, if they should go with the cobblestone version. By the way, the original stones of this road seem to not conform with current standards and this is why they cannot be reused. However, I do not know any more details about this.
Regarding the likely result of a life cycle comparison between asphalt and cobblestone I would agree with you. It would just be nice to get some numbers.
The reduction of car speed by cobblestone is very true. Most drivers take it slower, when they get this specific cobblestone feedback.
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