磷石膏晶须对沥青性能的改性研究

发布时间：2018-07-10 11:41

  本文选题：改性沥青 + 磷石膏晶须　； 参考：《贵州大学》2015年硕士论文

【摘要】：随着我国交通事业的发展,汽车的载荷量不断增加,对公路交通路面的要求越来越高,普通的沥青路面已经不能满足现代交通路面的发展要求。本文在了解国内外固体废弃物磷石膏的处理方法以及改性沥青研究现状的基础上,以磷石膏为原料,采用水热法合成磷石膏晶须(PSW),针对磷石膏晶须具有直径小、强度高、韧性好、耐高温、耐腐蚀、无毒等特点,将磷石膏晶须作为沥青改性剂,与磷石膏、市售半水硫酸钙晶须(HCSW)改性沥青对比,并用硅烷偶联剂KH502、KH570和钛酸酯偶联剂TCA105对磷石膏、HCSW、PSW三种填料分别改性,研究改性前后对沥青性能的影响。将磷石膏晶须与高密度聚乙烯(HDPE)共混,制成PSW/HDPE复合改性剂,研究其改性沥青的路用性能与改性机理,为磷石膏的处理和利用开辟一条新的途径。本文将磷石膏、HCSW和PSW三种填料按不同的量分别加入到沥青中,对比三种填料对沥青路用性能的改善效果。结果表明,当添加量为9%时,PSW对沥青性能的改善效果最好,软化点达到45.0℃,针入度指数达到0.9290,高于磷石膏和HCSW。经过硅烷偶联剂KH502、KH570和钛酸酯偶联剂TCA105对磷石膏、HCSW、PSW三种填料改性后,结果表明TCA105改性磷石膏后,当添加量为9%时软化点达到41.98℃,针入度指数增加到0.3040,对沥青的改性效果较好,KH502改性HCSW后,当添加量为9%时软化点达到43.84℃,针入度指数达到0.7450,对沥青的改性效果较好,KH570改性PSW后,当添加量为9%时软化点达到49.18℃,针入度指数达到0.9629,对沥青的改性效果较好。将PSW与高密度聚乙烯(HDPE)互配,按不同的质量分数制成PSW/HDPE复合材料,用该复合材料改性沥青,结果表明当PSW/HDPE复合材料中PSW质量分数为10%、15%、20%,当添加量为5%时软化点分别为88.67℃、83.42℃、77.28℃,针入度指数分别为1.969、1.952、1.9498,软化点和针入度指数都逐渐降低,对沥青的改性效果降低。分别用傅里叶红外光谱(FTIR)和差示扫描量热仪(DSC)对改性沥青的微观结构进行表征,探讨沥青的改性机理。结果表明磷石膏、HCSW、PSW以及PSW/HDPE复合材料对沥青的改性均为物理改性,并没有发生化学变化生成新的物质。
[Abstract]:With the development of transportation in our country, the load of automobile is increasing, and the requirement of highway traffic pavement is more and more high. The common asphalt pavement can not meet the development requirement of modern traffic pavement. On the basis of understanding the treatment methods of phosphogypsum and the research status of modified asphalt at home and abroad, the phosphogypsum whisker (PSW) was synthesized by hydrothermal method using phosphogypsum as raw material, aiming at the small diameter and high strength of phosphogypsum whisker. The phosphogypsum whisker is used as asphalt modifier and compared with phosphogypsum and HCSW modified asphalt, which is characterized by good toughness, high temperature resistance, corrosion resistance and non-toxicity. The phosphorous gypsum HCSWPSW was modified by silane coupling agent KH502KH570 and titanate coupling agent TCA105, respectively. The effects of modification on asphalt properties were studied. The phosphogypsum whisker was blended with high density polyethylene (HDPE) to prepare PSW / HDPE composite modifier. The road performance and modification mechanism of the modified asphalt were studied, which opened a new way for the treatment and utilization of phosphogypsum. In this paper, phosphogypsum HCSW and PSW fillers were added to asphalt in different quantities, and the improvement effects of these fillers on asphalt performance were compared. The results show that when the content of PSW is 9, the asphalt performance is the best, the softening point is 45.0 鈩，

本文编号：2113282