研究了脱油沥青(De-oiled asphalt)基气相生长碳纤维(VGCFs)增强水泥基复合材料的制备方法及其性能.以脱油沥青作原料,采用化学气相沉积法(CVD)制备出气相生长碳纤维,以此纤维制备水泥基功能复合材料.结果表明:低含量VGCFs的碳纤维增强水泥基复合材料具有良好的抗压强度和导电性能,在VGCFs的掺量由0增至0.6%范围内,随着VGCFs掺量的增加,碳纤维增强水泥基复合材料的电阻率下降,抗压强度提高.当VGCFs为0.4%时,VGCFs水泥基复合材料电阻率降低2个数量级,从3.25×10~5 Ω·cm降为1.49×10~3 Ω·cm,抗压强度提高28.8%,为最佳掺量.
A study on the preparation and performance of vapor grown carbon fibers (VGCFs) reinforced cement-matrix composites was carried out. VGCFs were prepared from de-oiled asphalt (DOA) by chemical vapor deposition (CVD) and then the cement-matrix composites were prepared with the VGCFs. The results show that the compressive strength and electrical conductivity of VGCFs reinforced cement-matrix composites with lower fiber content can be enhanced. The resistivity of cement-matrix composites decreases and compressive strength increases with weight fraction of VGCFs increasing from 0 to 0.6% in the paste. A fiber content of 0.4% by mass of cement is recommended, yielding a resistivity of 1.49×10~3 Ω·cm. This value is lower by two orders of magnitude the value of 3.25×10~5 Ω·cm for the same paste without VGCFs. And the compressive strength increases by 28.8% as the VGCFs content increases from 0 to 0.4% by mass of cement.
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