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首页> 美国卫生研究院文献>Materials >Functional Properties of a Pitch-Based Carbon Fiber–Mortar Composite as a Thin Overlay for Concrete Pavement
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Functional Properties of a Pitch-Based Carbon Fiber–Mortar Composite as a Thin Overlay for Concrete Pavement

机译：沥青基碳纤维砂浆复合材料作为混凝土路面薄覆盖层的功能特性

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This experimental study investigated the utility of a pitch-based carbon fiber–mortar composite, which could replace polyacrylonitrile carbon fiber, as a thin overlay for concrete pavement. The objective was to explore the utility of the low-cost carbon fiber, which was produced via a melt-blown method, i.e., blowing at high pressure after melting the pitch residue following crude oil purification. The mechanical properties, durability, and thermal properties of the pitch-based carbon fiber were explored to maximize strength, durability, functionality, and economy by using micro-sized fibers that are closer in size to the constituents of cementitious materials. Melt-blown pitch-based carbon fiber has low individual fiber strength but generally excellent thermal conductivity. Thermal conductivity tests were conducted on mortar panels (560 mm × 560 mm; thickness = 25, 40 or 60 mm) containing 0, 0.4, 0.5 or 0.6 wt % pitch-based carbon fiber. The absolute thermal conductivity tended to improve with higher wt % of pitch-based carbon fiber, in the range of 9~11 W/°C. However, thermal conductivity tended to be lower under the 0.6 wt % condition, possibly due to the effect of dispersion. Compressive strength degradation was tested over 350 cycles of freezing and thawing: the strength of the 0.4, 0.5 or 0.6 wt % samples was 91, 89, and 82%, respectively, relative to the control specimen (0 wt %). Thus, all specimens had a compressive strength of 80% or more after 350 cycles compared to the control specimen. To test the adhesion performance for new thin overlays and old concrete surfaces, concrete cylinders (100 × 200 mm; thickness = 10 mm) were cut at an angle of 46 degrees, and the pitch-based carbon fiber-mortar composite was used to bond the various sections. The bond strength of the test specimens was more than twice that of the reference specimen.
机译：这项实验研究研究了沥青基碳纤维-砂浆复合材料的实用性，该复合材料可以代替聚丙烯腈碳纤维，用作混凝土路面的薄覆盖层。目的是探索低成本碳纤维的实用性，该碳纤维是通过熔喷法生产的，即在原油提纯后熔化沥青残渣后在高压下吹塑。研究了沥青基碳纤维的机械性能，耐久性和热性能，以通过使用尺寸更接近胶结材料成分的微尺寸纤维来最大程度地提高强度，耐久性，功能性和经济性。熔喷沥青基碳纤维的单纤维强度低，但总体上具有出色的导热性。在包含0、0.4、0.5或0.6 wt％沥青基碳纤维的砂浆面板（560毫米×560毫米；厚度= 25、40或60毫米）上进行导热性测试。在9〜11W /℃的范围内，随着沥青基碳纤维的较高wt％，绝对导热率趋于改善。然而，可能由于分散的影响，在0.6重量％的条件下热导率趋于降低。在350个冷冻和解冻循环中测试了抗压强度的下降：相对于对照样品（0 wt％），0.4、0.5或0.6 wt％样品的强度分别为91％，89％和82％。因此，与对照样品相比，所有样品在350次循环后均具有80％或更高的抗压强度。为了测试新的薄覆盖层和旧混凝土表面的粘合性能，以46度角切割混凝土圆柱体（100×200 mm；厚度= 10 mm），并使用沥青基碳纤维砂浆复合材料粘合各节。测试样品的粘结强度是参考样品的两倍以上。

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