%0 Journal Article %T 纳米CaCO3/SBR复合改性沥青的性能与机理<br>Properties and mechanism of composite asphalt modified by nano-CaCO3/SBR %A 赵宝俊 %A 赵士峰 %A 张洪亮 %A 苏曼曼 %J 长安大学学报(自然科学版) %D 2017 %X 为了提高沥青的高、低温性能，减缓炎热、严寒天气引起的道路病害，延长沥青道路的使用寿命，利用纳米/聚合物复合改性剂，研究能同时提高沥青高、低温性能的复合改性方案。采用硅烷偶联剂KH560对纳米CaCO3表面进行活化改性，减少纳米材料的团聚现象，并改善有机物与无机物之间的相容性。采用机械搅拌法和高速剪切法制备纳米CaCO3/SBR复合改性沥青，测定纳米CaCO3/SBR复合改性沥青的软化点、针入度和延度，同时进行老化试验、动态剪切（dynamic shear rheometer, DSR）试验和小梁弯曲（beam bending rheometer, BBR）试验，研究纳米CaCO3和SBR对基质沥青物理性能的改善效果，并通过扫描电镜、荧光显微镜及红外光谱微观检测，对纳米CaCO3/SBR复合改性沥青的微观结构和共混机理进行分析。研究结果表明：纳米CaCO3和SBR掺量（质量分数，下同）分别为5%和4%时，纳米CaCO3/SBR复合改性沥青软化点比SK-70#基质沥青提高了22.3 ℃，针入度降低了1.25 mm，延度值大于100 cm；老化试验、DSR试验和BBR试验结果也表明纳米CaCO3/SBR复合改性沥青具有良好的高温性能和低温性能，可满足夏热冬寒地区的要求；加入纳米CaCO3有效改善了SBR在基质沥青中的分散效果，提高了SBR与沥青界面相的结合能力；纳米CaCO3/SBR复合改性过程比较复杂，SBR与沥青之间以物理改性为主，纳米材料与沥青之间产生物理改性变化的同时也发生化学反应。<br>In order to improve properties of asphalt under high and low temperature, retard road distress caused by hot and cold weather, and prolong service life of asphalt pavement, the perspective of nano-particles and polymer composite modifier was considered, and the nano-particles/polymer modification system that could improve properties of asphalt under high and low temperature was studied. In order to wake the agglomeration among nano-particles and improve the compatibility between organic material and inorganic material, nano-CaCO3 was modified with silence coupling agent KH560. Nano-CaCO3/SBR composite modified asphalt was prepared by high-speed shear and mixing machine. The softening point, penetration and ductility of nano-CaCO3/SBR composite modified asphalt were measured, and the aging test, dynamic shear rheometer test and beam bending rheometer test were conducted to study the improvement of nano-CaCO3 and SBR on physical property of base asphalt. Scanning electron microscope (SEM), fluorescence microscope and Flourier transform infrared spectroscopy (FTIR) were conducted to study the micro？？morphology and modification mechanism of composite modified asphalt. The results show that when the amounts of nano-CaCO3 and SBR are 5% and 4% of asphalt by weight, respectively, the softening point of nano-CaCO3/SBR composite modified asphalt increases by 22.3 ℃ compared to SK-70# base asphalt, the penetration decreases by 1.25 mm, and the ductility value increases to above 100 cm. The results of aging test, DSR test and BBR test also show that the properties of nano-CaCO3/SBR composite modified asphalt under high and low temperature are excellent, and this asphalt can be used in the area in which the temperature is very high in summer and very low in winter. Nano-CaCO3 particles can promote the dispersion of SBR in base asphalt and improve the interface binding ability between SBR and base asphalt. %K 道路工程 %K 纳米CaCO3 %K SBR %K 复合改性沥青 %K 性能 %K 改性机理< %K br> %K road engineering %K nano-CaCO3 %K SBR %K composite modified asphalt %K property %K modification mechanism %U http://zzszrb.chd.edu.cn/oa/DArticle.aspx?type=view&id=201412098