IPP加入对SBS改性沥青性能影响的研究

本文对ＳＢＳ改性低分子量物质含量高的沥青进行了试验研究，提出加入ＩＰＰ是提高ＳＢＳ改性沥青性能的一条有效途径．     

Effect of rejuvenators on performance and microstructure of aged asphalt

A composite rejuvenator was used for the rejuvenation of aged asphalt in comparison with the common rejuvenator. The effects of the rejuvenators on the performance and microstructure of the aged asphalt were investigated by physical properties tests, dynamic shear rheometer and atomic force microscopy. The results indicate that the physical and rheological properties of the aged asphalt are restored more significantly by the composite rejuvenator than the common rejuvenator, which can be ascribed to the effective recovery of microstmcture of the aged asphalt. The composite rejuvenator has the potential to be used for the rejuvenation of severely aged asphalt since it can restore the colloidal structure of the aged asphalt effectively through composition regulation and chemical reactions between the composite rejuvenator and asphaltenes.     

单组分聚氨酯/蒙脱土纳米复合防水涂料的研究

采用插层聚合法制备单组分聚氨酯／蒙脱土(PU／OMMT)纳米复合防水涂料，并研究蒙脱土用量对涂料的结构与性能的影响。广角X-射线(WAXD)衍射分析表明，聚氨酯在蒙脱土片层间进行插层聚合．可导致蒙脱土层间距扩大。与PU相比．在有机蒙脱土(OMMT)用量为3％以内时．PU／OMMT纳米复合防水涂料的拉伸强度、断裂伸长率均明显提高．而在OMMT用量为3％以上时，由于OMMT片层间含有有机铵．其活泼氢可与-NCO反应．导致PU／OMMT复合防水涂料的-NCO含量下降．固化交联度不够，致使其力学性能下降。     

我国建筑防水涂料的现状与发展

介绍我国建筑防水涂料的现状及存在问题,提出我国建筑防水涂料的发展应由溶剂型向水乳型,由薄质型向厚质型,由深色向浅色,由低档向高弹性、高耐久性、功能性方向发展。大力研究开发和推广高性能、高耐候、环保型防水涂料和多功能防水涂料,研究开发防水涂料系列产品,重点发展环保型聚氨酯、丙烯酸、橡胶改性沥青和水泥基渗透结晶型防水涂料,提高中、高档防水涂料比例,加快施工机具的研制与推广。     

覆膜油毡的检测问题

覆膜油毡的检测问题孔宪明，余剑英，王幼平（武汉工业大学）１问题的提出石油沥青及改性石油沥青油毡的表面有粒料撒布和表面覆膜两种方式。其作用主要是：（１）隔离作用，以防油毡在卷毡及贮运过程中粘连；（２）用于单层屋面油毡上表面的防老化。通常用作隔离作用的材...     

杯芳烃及其应用

杯芳烃是一类新型环状主体分子。文中简要介绍了杯芳烃类化舍物的合成途径、性质、应用以及这类新型大环化合物的研究进展。     

YJH渗透结晶型防水材料耐化学侵蚀和抗冻融循环的研究

对YJH渗透结晶型防水材料化学侵蚀和冻融循环前后试件的外观变化和抗压强度、抗渗压力进行了测试．并与XYPEX渗透结晶型防水材料和沥青材料进行了试验对比，结果表明YJH渗透结晶型防水材料具有优良的耐化学腐蚀和抗冻融循环能力。     

Effects of thermal-oxidative aging on rheological properties of montmorillonite modified bitumen

Organic montmorillonite(OMMT) modified bitumen nanocomposites was prepared by melt blending.The effects of thin-film oven test(TFOT) and pressure ageing vessel(PAV) on rheological properties of pristine bitumen and OMMT modified bitumen were investigated by dynamic shear rheometer(DSR).The results show that complex modulus(G*) increases,phase angle(δ) decreases and rutting factor(G*/sin δ) is enhanced for the pristine bitumen after TFOT,whereas G*,δ and G*/sin δ of OMMT modified bitumen have a little change before and after TFOT.Besides,the pristine bitumen exhibits a large increase of G* and a great decrease of δ after PAV aging.However,the changes in G* and δ of OMMT modified bitumen are small before and after PAV.Compared with the pristine bitumen,OMMT modified bitumen presents a lower fatigue factor(G*sin δ) after PAV.As a consequence,resistance to thermal-oxidative aging of bitumen is remarkably improved due to the introduction of OMMT.     

Effect of different montmorillonites on rheological properties of bitumen/clay nanocomposites

Different composites of organomodified montmorillonite(OMMT)/bitumen were prepared by melt blending with hexadecyl dimethyl benzyl ammonium modified montmorillonite(HBM) and double octadecyl dimethyl ammonium modified montmorillonite(DOM).The structures of two kinds of montmorillonite modified bitumen were characterized by X-ray diffraction(XRD).The effects of different montmorillonites on the dynamic rheological properties of the modified bitumens were investigated by dynamic shear rheometer(DSR).The XRD results show that DOM modified bitumen forms an intercalated structure,whereas the HBM modified bitumen forms an exfoliated structure.DSR results indicate that OMMT modified bitumens exhibit higher complex modulus,lower phase angle than pristine bitumen,which means that the resistance to rutting at high temperatures of pristine bitumen is improved due to the introduction of OMMT.Compared with DOM modified bitumen,HBM modified bitumen shows better rutting resistance,which is contributed to the formation of exfoliated structure in HBM modified bitumen.     

有机温拌剂对SBS改性沥青及其混合料性能的影响研究

研究了SKW有机温拌剂对SBS改性沥青的物理性能、润湿性能以及对SBS改性沥青混合料性能的影响。结果表明,该温拌剂明显增大了SBS改性沥青的针入度和延度,显著降低了其135℃时的粘度,并提高了其与集料之间的润湿性,而对软化点的影响很小。当温拌剂的掺量为沥青用量的2%时,SBS改性沥青混合料的拌合温度和压实温度可分别降低25℃和35℃,而温拌SBS改性沥青混合料的体积性能、水稳定性和高温稳定性与热拌SBS改性沥青混合料相当。