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String not bitumen
| 题名： | String not bitumen |
| 正文语种： | eng |
| 摘要： | The idea originated from another project carried out at the Gramazio Kohler Research lab at ETH Zurich. Here string was used instead of cement to connect aggregate in pillars. Researchers discovered that 330mm-diameter pillars, 0.8m high, could withstand a pressure of 200kN, or 20tonnes. Empa scientists Martin Arraigada and Saeed Abbasion, who work in the institute's concrete and asphalt laboratory wanted to find out if the idea could transfer to roads. "We want to find out how a recyclable pavement could be produced in the future. To do this, we are using digitalised construction methods in road construction for the first time," said Arraigada. To test the aggregate-string combination, the researchers laid five layers of aggregate on a rubber mat, with string installed by the robotic arm in between each layer in a preprogrammed pattern. The construction was then loaded using a rotating plate and could withstand 5kN, or half a tonne, before the stones started to move substantially. In comparison, layers of aggregate without the string displaced far earlier. According to Empa, there could be several benefits of such a system. First, fewer pollutants due to the production and heating of bitumen; second, a permeable road surface that allows water to pass through; and third, the possibility of recycling the material more easily. |
| 出版年： | 2021 |
| 期刊名称： | World highways |
| 卷： | 30 |
| 期： | 3 |
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