Recycling Technology of Aged Asphalt Pavement

Firstly,the current development of the technologies for recycling of reclaimed asphalt pavement(RAP) in China and abroad is introduced in this study.The theoretic evidence is supplied for the feasibility and means of the recycling technology for RAP by analyzing the aged asphalt recycling mechanism.On the basis of it,a series of recycling processes for RAP are stated in detail,including the performance assessment of RAP,mix design and construction techniques of recycling asphalt mixture.The traits and actual example of different construction techniques for RAP supplied a good consultation for its reasonable choice.All of them would play a role in the research,application and spread of the recycling technologies for RAP in China.     

Principle and Application of the Asphalt Pavement Recycling Technology

With the coming maintenance period of the aging road in China, the old asphalt pavement's recycling has become an important issue.By introducing the principle of the asphalt pavement recycling technology and the status quo of the application, this paper calls for a strengthened relational research and a heavy concern with the issues, so as to gain the optimum economical and social benefit.     

Predicting Damage Rate of Asphalt Pavement for the Fatigue Performance Cracking with Axial Loading

The damage rate of asphalt pavement for the fatigue performance cracking is studied with axial loading by the relationshi Pof surface cueved index with Falling Weight Deflection basin, bottom pulling strain of asphalt surface and aumbers of axial loading. The predicting result of standard axial loading and more-classified loading is very different, so as its increasing rate with the time going. It fits real circumstance to predict the fatigue character of asphalt pavement according to more-classified loading and could be an effective measurement for predicting fatigue life of asphalt pavement ruder axial loading.     

曲酸真空浸渍处理对鲜切马铃薯冷藏期褐变及相关生理代谢的影响

为研究曲酸对鲜切马铃薯的抗褐变机制,以鲜切马铃薯为试材,采用0.3 g/L曲酸溶液进行真空浸渍(VI)处理,用聚乙烯保鲜膜包装后于(4±1)℃下冷藏12 d,分析鲜切马铃薯冷藏期间的褐变指数(BI)、多酚氧化酶(PPO)活性、过氧化物酶(POD)活性、苯丙氨酸解氨酶(PAL)活性、总酚含量以及抗氧化能力的变化。结果表明,曲酸VI处理组和对照组鲜切马铃薯PPO活性均呈上升趋势,但曲酸VI处理组的上升幅度显著低于同期对照组(P<0.05),冷藏第12天时,曲酸VI处理组的PPO活性较同期对照组下降了27.6%,这与BI值变化趋势基本一致。曲酸VI处理组的PAL活性也显著低于同期对照组(P<0.05)。然而,冷藏期间曲酸VI处理组的POD活性显著高于同期对照组(P<0.05)。在冷藏0~8 d,曲酸VI处理组总酚含量显著高于对照组(P<0.05)。两组的抗氧化能力在冷藏初期(0~2 d)差异不大,但贮藏4~12 d,曲酸VI处理组显著高于对照组(P<0.05)。因此,曲酸VI处理可以抑制PPO活性,延缓鲜切马铃薯冷藏期间的褐变。