沥青

Research also shows that in different test condition, sensitivity, accuracy, and stability of bending creep test at 0 C are better than that of bending test at -10C. Thus, bending creep test at 0C can preferably evaluate the crack resistance of asphalt mixture at low temperature.

结果表明，老化过程大大降低了沥青混合料的低温抗裂性能，0℃弯曲蠕变试验比-10℃弯曲试验对不同的试验条件的区分度更大，试验误差更小，稳定性更好，可较好地评价沥青混合料的低温抗裂性能。

It is found that modified asphalt added 4 percent SBS is able to improve high-temperature stability, low-temperature anti-cracking performance and high-temperature susceptility of petroleum asphalt,which is enough to satisfy the performance stand.

结果表明，石油沥青中添加 4 %SBS可以明显改善石油沥青的高温稳定性、低温抗裂性和感温性，使其基本满足铺路沥青的要

Through some information investigation and pavement crack pouring practices,it is found that as a new material,HR polymer asphalt crack pouring material forming by mixing AH-70# heavy-traffic petroleum asphalt with HR polymer in fixed proportion can by used to repair asphalt pavement cracks,and the effect is good,which has positive significance for prolonging the maintenance period of roads and reducing maintenance costs.

通过一些资料调查及路面灌缝实践发现，将AH-70#重交通石油沥青与HR型聚合物按一定比例掺配合成的HR型聚合物沥青灌缝新材料用于修补沥青路面裂缝，效果较为明显，对延长道路的维护周期、减少养护费用具有积极的意义。

Bap concentrations in petroleum asphalt were determined using the high-performance liquid chromatographic technique.

Bap含量，石油沥青仅含0.0004％～0.0008％，而煤焦沥青中含0.46％。结论：石油沥青急性经口属微毒物质，在常温及非高温加热融化情况下，不具有动物致癌作用。

In a situation that this imported product demand will also be improved further in the following several years, Must optimize system this purchase, transport, load and unload, store, dredge competence of link of transporting etc., Introduce the advanced idea and method on the materials supplies of expressway construction abroad, Adopting more advanced modern material flow thought on the software, the pitch is provided and deliver to constructing; Develop performance excellent keeping the tank wagon warm with low costs on the hardware; Supply the barge special-purpose and in bulkly ; The special- purpose pitch shipping dock stores pot, etc.

本文根据以上情况分析了当前我国进口沥青各环节的情况以及存在的问题，特别是各环节费用的居高不下严重地影响了我国高速公路的建设成本，同时通过我国进口沥青运输需求影响因素的分析，各种预测方法的筛选，来预测我国进口沥青运输需求量的趋势。

Adopting equal density method to prepare PMA, it is not need to add reactive additives and the problem of pollution and selectivity to reactive additives avoided. Adopting the method, the asphalts modified by polymers, including SBS, LDPE, SEBS were easily prepared with storage stability at high temperature and cost less. With the method of equal density, high performance and good storage-stability of SBS modified-asphalts were prepared by premixing SBS and kaolinite or diatomite clay.

采用等密度方法将聚合物与填料预先共混制备的改性沥青不加入反应添加剂，回避了反应共混改性难以控制和环境污染问题，采用此方法可以制备出高温贮存稳定的不饱和聚合物SBS、饱和聚合物SEBS及LDPE改性沥青，且成本低廉，在实际应用中所添加量情况下填料的介入对改性沥青其它性能影响不大。

Based on the present research and developing trend of modified asphalt in our country and outsides,this paper analyses the polymer modified asphalt will be broadly used in our highway engineering surely.

本文在了解目前国内外改性沥青的研究现状及发展趋势的基础上，分析了SBS改性沥青必将会在我国被广泛应用，成为我国改性沥青的发展方向和趋势。

The trail bridge design,the mixture performance test,the temperature between the different layers of the deck surfacing,the traffic investigation and the surface performance observation are introduced in this article.The basic performance of the mixture used in the trial bridge is analyzed through rutting tests at high temperature,bending tests at low temperature,fatigue tests of the composite beam and pull off tests.The rule of the temperature gradient distribution in the pavement and the variety relation ...

介绍润扬大桥钢桥面铺装试验桥的方案设计、试验研究、温度测试、交通量调查和使用性能跟踪观测，通过混合料高温车辙试验、低温弯曲试验、复合梁疲劳试验以及拉拔试验等分析实桥试验沥青混合料基本性能，阐述铺装内各层温度梯度分布规律及与大气温度变化关系，通过使用性能跟踪观测介绍浇注式沥青混凝土+环氧沥青混凝土新型铺装结构的工程效果。

The results showed that the surface layer and the bottom layer of the road pavement experience the repeated horizontal tensile and compressive stresses under cyclic loading and small residual tensile and compressive stresses build up in the surface layer and bottom layer respectively. This is probably one of the factors causing top-down or bottom-up fatigue cracking in the asphalt pavement.

结果表明在循环荷载作用下，路表和沥青层底都经受水平压应力和拉应力的重复作用，且在路表和沥青层底分别产生少量的残余拉应力和残余压应力，这有可能是造成沥青路面从上到下或从下到上疲劳开裂的原因之一。

The surface morphologies of coal pitch spheres were characterized by scanning electron microscope and polarized light microscope. The effects of naphthalene content on the softening point of the modulated pitch, balling temperature on the spheres morphologies and the max mass ratio of pitch to the liquor were investigated.

使用扫描电子显微镜和偏光显微镜对沥青球的表面形貌进行表征，探讨了减黏剂萘含量对调制沥青软化点的影响，成球温度对球形貌的影响以及沥青／水相的最大质量比。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。