3D printing of asphalt and its effect on mechanical properties
3D printing of asphalt and its effect on mechanical properties
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DOI：
10.1016/j.matdes.2018.09.030
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发表时间：
2018-12
影响因子：
8.4
通讯作者：
R. Jackson;A. Wojcik;M. Miodownik
中科院分区：
文献类型：
--
作者：
R. Jackson;A. Wojcik;M. Miodownik
本文描述了设计，建造和测试沥青3D打印机的工作。遇到的主要困难是，沥青的行为作为一个非牛顿液体时，移动通过挤出机。因此，流变学和压力与设定温度和其他操作参数的关系显示出高度非线性的行为，并使得挤出过程的控制变得困难。通过创新的挤出机设计克服了这一困难，使沥青在各种温度和工艺条件下进行3D打印。我们展示了将沥青挤出成复杂几何形状和修复裂缝的能力。在一系列工艺条件下，将3D打印沥青的机械性能与铸造沥青进行了比较。3D打印的沥青具有与铸造不同的特性，在一定范围的工艺条件下具有更大的延展性。特别是，增强的机械性能是工艺温度的函数，我们认为这是由于沥青中的微观结构变化导致裂纹桥接纤维增加韧性。讨论了使用3D打印沥青修复道路裂缝和坑洞的优势和机会。
The paper describes work to design, build and test an asphalt 3D printer. The main difficulty encountered is that asphalt behaves as a non-Newtonian liquid when moving through the extruder. Thus, the rheology and pressure in relation to set temperature and other operational parameters showed highly non-linear behaviour and made control of the extrusion process difficult. This difficulty was overcome through an innovative extruder design enabling 3D printing of asphalt at a variety of temperatures and process conditions. We demonstrate the ability to extrude asphalt into complex geometries, and to repair cracks. The mechanical properties of 3D printed asphalt are compared with cast asphalt over a range of process conditions. The 3D printed asphalt has different properties from cast, being significantly more ductile under a defined range of process conditions. In particular, the enhanced mechanical properties are a function of process temperature and we believe this is due to microstructural changes in the asphalt resulting in crack-bridging fibres that increase toughness. The advantages and opportunities of using 3D printed asphalt to repair cracks and potholes in roads are discussed.