碳纤维增强混凝土裂纹钝化后的弯曲强度评价

The Evaluation of Flexural Strength after Blunting Crack in Carbon Fiber Reinforced Concrete

利用电沉积技术对碳纤维增强混凝土(CFRC)的裂纹实施钝化。在分析CFRC实施裂纹钝化后的弯曲强度分布状况的基础上,采用Weibull模数m值和特征强度σ的大小来评价该材料裂纹钝化后的性能。结果表明Weibull统计理论适宜解释电沉积技术的作用机理,CFRC在裂纹钝化后其强度提高了,离散性也得到了显著的改善。

Electro-deposition technology can be used to blunt cracks or damages in carbon fiber reinforced concrete (CFRC) due to the favorable electrical conductance of CFRC. The present work dealt with flexural strength distribution of CFRC with cracks or damages blunted on the basis of enough experimental results. Weibull modulus m and characteristic strength σ were used to evaluate the effect of the crack-blunted. Final results indicate that the flexural strength of CFRC samples is improved unanimously and the dispersal of the flexural strength is ameliorated evidently. The improvement of Weibull modulus shows that the most dangerous crack is renovated by the electro-deposition and the increase of characteristic strength is owing to the improvement of strength of the samples with smallest value. The method used in this paper is better than that of average strength. Firstly, Weibull statistical theory that is used to analyze the effect of crack-blunted can open out the essence of electro-deposition technology, whereas average strength theory is short of that. Secondly, the method of characteristic strength is more credible than that of average strength because of its favorable convergence when the number of samples is small.