【作者】 唐新德； 满新凯； 韩念凤； 贺忠国； 张德洋；

【Author】 TANG Xin-de, MAN Xin-kai, HAN Nian-feng, HE Zhong-guo, ZHANG De-yang (Institute of New Materials and Department of Civil Engineering, Shandong Jiaotong University, Ji’nan 250023,China)

【机构】 山东交通学院新材料研究所土木过程系；

【摘要】 采用熔融共混法制备纳米碳酸钙/SBS复合改性沥青。利用旋转薄膜烘箱试验研究其老化性能。结果表明,纳米碳酸钙与SBS均匀分散于基质沥青中,得到的纳米碳酸钙/SBS复合改性沥青的韧性、强度与热稳定性得到改善。纳米碳酸钙对SBS改性沥青的影响表现为针入度降低、软化点升高、延度减小。纳米碳酸钙/SBS复合改性沥青的高温抗形变能力提高。与基质沥青相反,纳米碳酸钙/SBS复合改性沥青老化后软化点降低,源于二者流变性能的不同。与SBS改性沥青相比,纳米碳酸钙/SBS复合改性沥青的抗老化性能变差,说明纳米碳酸钙不能阻止氧的扩散与渗透。更多还原

【Abstract】 Composite modified asphalts with nanoscale calcium carbonate (nano CaCO3) and SBS were prepared by melt blending. Rolling thin film oven test (RTFOT) was carried out to study the aging property. The results demonstrate that both nano CaCO3 and SBS homogeneously disperse in the base asphalt, which lead to an improvement in terms of toughness, strength, and thermal stability. Impact of nano CaCO3 on the properties of SBS modified asphalt appears as a decreasing penetration, an increasing softening point, and a decreasing ductility. The anti-deformation ability under high temperature of nano CaCO3/SBS modified asphalt improved. The softening point of nano CaCO3/SBS modified asphalt decreases after aging, in contrast with that of the base asphalt, which is attributed to the different rheological peoperties between nano CaCO3/SBS modified asphalt and the base asphalt. Compared with that of SBS modified asphalt, the anti-aging property of nano CaCO3/SBS modified asphalt becomes worse.更多还原