In order to study the influence of thermal oxygen aging and photo oxygen aging on the waterborne epoxy emulsified asphalt residues, the changes of rheological properties, chemical structure and micromorphology of emulsified asphalt residues with different epoxy resin contents before and after aging are evaluated by using dynamic shear rheometer（DSR）, Fourier transform infrared（FTIR） spectroscopy and fluorescence microscope. The result shows that（1） Under the same aging condition, with the increase of epoxy resin content, the complex modulus aging index of emulsified asphalt evaporation residue gradually decreases, and the phase angle aging index gradually increases.（2） With the same content of epoxy resin, the complex modulus aging index of the same asphalt in thermal oxygen aging is greater than that in photo oxygen aging, while the phase angle has the opposite trend.（3） The change of sulfoxide group index of evaporation residue of emulsified asphalt without epoxy resin is about 8 times that of evaporation residue of emulsified asphalt with 15% epoxy content after thermal oxygen aging, while the change of sulfoxide group index of the former is about 7 times that of the latter after photooxygen aging.（4） Comparing the change of sulfoxide group index of evaporation residue of emulsified asphalt with 15% epoxy resin content after thermal oxygen aging and photo oxygen aging, it shows that the sulfoxide group index after thermal oxygen aging is 10 times of that after photo oxygen aging, while for evaporation residue of emulsified asphalt without epoxy resin, the sulfoxide group index after thermal oxygen aging is 9 times of that after photo oxygen aging. Compared with photo oxidation aging, thermal oxygen aging is more likely to deepen the aging degree of asphalt.（5） The 3D network structure formed by epoxy resin protects some asphalt from the influence of thermal oxygen and photo oxygen aging. The higher the content of epoxy resin, the better the anti-aging performance of emulsified asphalt evaporation residue.

循环水站中大型循环水泵进出口管道由于膨胀节的选用不当和安装偏差,以及管道支架设置不合理,往往会导致启泵失败,甚至对泵造成损坏.通过对两个工程实例进行分析研究和应力分析模拟计算,给出膨胀节和管道支架整改方案,改进后循环水泵启停正常、运行平稳.最后对该类管道上膨胀节的选用与安装,支架设计提出建议.

为了提高钢-超高性能混凝土组合桥面沥青铺面层的使用寿命,利用聚氨酯/环氧树脂对沥青结合料进行改性.通过红外光谱试验、荧光显微镜试验对聚氨酯/环氧树脂改性沥青的固化进程进行了表征.分别采用了聚合物改性沥青离析试验、布氏旋转黏度试验、拉伸试验测试了改性沥青的储存稳定性、黏时特性和力学性能.借助动态剪切流变仪试验和低温弯曲梁流变仪试验研究了改性沥青的高低温性能.试验结果表明:在固化过程中,聚氨酯/环氧树脂与复配胺类固化剂发生开环反应并逐步形成了聚合物互穿网状(IPN)结构,聚氨酯/环氧树脂相由分散相转变为连续相,改性沥青的黏度先缓慢增长至凝胶点后快速拉升并且受固化温度和改性剂掺量的影响较大;聚氨酯/环氧树脂改性沥青因IPN结构的骨架作用具有超高的拉伸强度和较好的柔韧性,而且相较于普通环氧沥青,低温性能得到改善;聚氨酯/环氧树脂能够大幅提高沥青的高温抗车辙能力,其改善效果随着掺量的增加而增强;35％改性剂掺量的聚氨酯/环氧树脂改性沥青拥有最好的储存稳定性.

环氧沥青混合料因胶结料具有热固性而导致其在重复荷载与低温状态下变形能力不足,前期大量研究结果表明聚氨酯的加入可使环氧沥青形成互穿聚合物网状(IPN)结构进而提高胶结料的弹性恢复性能.为了研究聚氨酯/环氧树脂改性沥青混合料的路用性能,对不同聚氨酯/环氧树脂掺量的改性沥青混合料进行了马歇尔稳定度试验、车辙试验、低温劈裂试验、浸水马歇尔试验、冻融劈裂试验和抗滑性能试验,得到了马歇尔模数、动稳定度、破坏劲度模量和残留强度比等性能评价指标结果,并与SBS改性沥青混合料进行了对比分析.结果表明:聚氨酯/环氧树脂改性沥青混合料的马歇尔模数和动稳定度是SBS改性沥青混合料的2～6倍,并且随着改性剂掺量的增加而提高,说明聚氨酯/环氧树脂大幅提升了沥青的高温抗车辙性能;聚氨酯的加入使环氧沥青的劲度模量降低至800 MPa左右,其中聚氨酯/环氧树脂掺量为35％的改性沥青混合料的降幅最大,但依然高于SBS改性沥青混合料,意味着聚氨酯/环氧树脂改性沥青混合料的低温抗裂性能比SBS改性沥青混合料差;不同改性剂掺量的聚氨酯/环氧树脂改性沥青混合料的水稳定性和抗滑性能与SBS改性沥青混合料相差不大,都能够满足钢-超高性能混凝土组合桥面结构的使用要求.

循环水冷却器结垢是一种常见现象,结合某项目压缩机段间冷却器的结垢问题,说明了结垢对设备和工艺系统的危害.分析得出,壳侧工艺气进口温度高和循环冷却水水质差,是导致换热管内结垢堵塞的主要原因.最后从降低工艺气进口温度、改变冷却介质水质的角度出发,提出了解决方案,保证压缩机段间冷却器的安全稳定运行.

The working principle of air twister and the disposal on abnormal cases during the application are Introduced;the breaking strength,ratio of strength holding and the ratio of breaking warps for the cords are improved.The application of air twister shows that the nylon 66 tire cord fabric can be achieved with no splices,the quality of appearance is improved,and the quality control and customer requirements can be met.