酸处理玄武岩纤维沥青常规性能研究

STUDY ON THE EFFECT OF ACID TREATMENT ON THE PERFORMANCE OF BASALT FIBER ASPHALT

为增强玄武岩纤维(BF)在沥青中的加筋及增强效果,选用1. 0 mol/L和2. 5 mol/L的盐酸(HCL)溶液对BF表面进行侵蚀处理,通过环境扫描电镜(ESEM)试验和红外光光谱(FTIR)试验对其表面微观形貌进行观测分析,原样BF表面光滑,HCL溶液侵蚀处理后,BF呈现整体侵蚀,表面形成硅酸胶层,-OH含量有所增加;通过软化点、5℃测力延度及ESEM试验等,研究了玄武岩纤维沥青的常规性能及拉拔断口形貌,随着HCL溶液浓度及处理时间增加,BFA的性能基本呈先好后坏的趋势,从BFA断口处明显可以看出酸溶液处理后的BF表面裹覆了一层薄薄的沥青膜,且得到了HCL溶液处理BF相对较优的方案为:溶液浓度为2. 5 mol/L,处理时间为20 min。

In order to enhance the reinforcement and strengthening effect of basalt fiber( BF) in asphalt,surface treatment of BF by 1. 0 mol/L and 2. 5 mol/L HCL solution was performed. The surface morphology of BF was observed by environmental scanning electron microscopy( ESEM) and infrared spectroscopy. The results show that the surface of original BF was smooth,but the BF showed overall erosion after HCL solution treated. And the BF surface forms a silica gel layer,and the-OH content has increased. Conventional performance and tensile fracture morphology of the basalt fiber asphalt were characterized by softening point,5 ℃ force-ductility and ESEM test.With the increase of HCL solution concentration and treatment time,the performance of BFA is firstly improved and then decreased. It can be clearly seen from tensile fracture morphology of BFA that the surface of BF treated with acid solution is coated with a thin asphalt film. And the best treatment time and concentration of HCL solution for BF erosion were 20 min,2. 5 mol/L.