气相生长碳纤维增强水泥基复合材料的制备及性能

Preparation and properties of vapor grown carbon fibers reinforced cement-matrix composites

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3.25×105Ω.cm降为1.49×103Ω.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 1.49×103 Ω·cm.This value is lower by two orders of magnitude the value of 3.25×105 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.