以脱油沥青(DOA)为原料,采用化学气相沉积法(CVD)制备出气相生长碳纤维(VGCFs).利用硬化试件电阻测试法和硬化试件断面形貌法.测试了VGCFs增强水泥的电阻率、变异系数和断面扫描电镜形貌,考察了3种不同制备工艺下VGCFs在增强水泥复合材料中的分散性.结果表明,先将分散剂、消泡荆、VGCFs在水中预分散再加入超细矿粉和水泥的搅拌工艺分散效果最好,干混法与湿混法较差.采用合理的制备工艺(预分散法),当VGCFs掺量为0.2%(体积分数)时可制得纤维均匀分散、电阻率小、变异系数小的VGCFs增强水泥.
VGCFs are prepared from de-oiled asphalt(DOA) by chemical vapor deposition(CVD). Based on the measurements of the resistivity, the variation coefficient and scanning electron microscopy(SEM) fractographs for the specimen. The influence of different preparation processing on the dispersion of carbon fiber in cement reinforced with VGCFs are studied. The results indicate that using dispersant and defoamer for pre-dispersion, together with proper manufacturing technology, the dispersion of VGCFs in cement can be improved, compared to the corresponding other two methods. VGCFs reinforced cement is carried out by reasonable preparation process( pre-dispersion method) when VGCFs dosage is 0. 2%,and its fibers distribute evenly, resistivity and coefficient of variation is small.
参考文献
| [1] | Andrzej M. Brandt .Fibre reinforced cement-based (FRC) composites after over 40 years of development in building and civil engineering[J].Composite structures,2008(1/3):3-9. |
| [2] | Shen Bin et al.Functionally-graded fiber-reinforced cement composite:Processing,microstructure,and properties[J].Cement and Concrete Composites,2008,30:663. |
| [3] | Chung D D L .Cement reinforced with short carbon:A multifunctional material[J].COMPOSITES PART B-ENGINEERING,2000,31:511. |
| [4] | Wen Sihai;Chung D D L .Electrical-resistance-based damage self-sensing in carbon fiber reinforced cement[J].CARBON,2007,45:710. |
| [5] | Han Baoguo;Guan Xinchun;Ou Jinping .Electrode design,measuring method and data acquisition system of carbon fiber cement paste piezoresistive sensors[J].Sensors and Actuators A:Physical,2007,135:360. |
| [6] | 欧进萍,关新春,李惠.应力自感知水泥基复合材及其传感器的研究进展[J].复合材料学报,2006(04):1-8. |
| [7] | Chuang Wang;Ke-Zhi Li;He-Jun Li .Effect of carbon fiber dispersion on the mechanical properties of carbon fiber-reinforced cement-based composites[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):52-57. |
| [8] | Yang Yuanxia .Methods study on dispersion of fibers in CFRC[J].Cement and Concrete Research,2002,32:747. |
| [9] | Lu Weiming;Fu Xuli;Chung D D L .A comparative study of wettability of steel,carbon and polyethylene fibers by water[J].Cement and Concrete Research,1998,28:6. |
| [10] | Fu Xuli;Chung D D L .Effect of methylcellulose admixture on the mechanical properties of cement[J].Cement and Concrete Research,1996,26:4. |
| [11] | Zhao S Q;Xu Z M;Xu C M .Feedstock characteristic index and critical properties of heavy crudes and petroleum residua[J].Journal of Petro Sci Eng,2004,41:233. |
| [12] | Wen Sihai;Chung D D L .Double percolation in the electrical conduction in carbon fiber reinforced cement-based materials[J].CARBON,2007,45:263. |
| [13] | Bing Chen;Keru Wu;Wu Yao .Conductivity of carbon fiber reinforced cement-based composites[J].Cement & concrete composites,2004(4):291-297. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%