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Assessing the Ageing Impact on Fatigue-Life of Asphalt Concrete

Journal of Building Material Science 2020年第2期2卷 9-15页

作者： Saad Issa sarsam sarsam and associates consult bureau sacb.baghdad Iraq

The fatigue-life of asphalt concrete is often related to environmental condition,loading condition,ageing,material composition and *** work investigates the influence of short and long term ageing of laboratory beam specimens,asphalt percent,and testing temperature on fatigue life of asphalt concrete wearing *** samples of(30 × 40 × 6)cm have been prepared,beam specimens of(40 × 5 × 6)cm were extracted from the asphalt concrete slab samples and tested for fatigue-life under the impact of three levels of micro strain(250,400,and[3]750)at(5,20,and 30)℃ before and after practicing long-term *** was observed that the fatigue-life decreased by(85 and 97)%,(87.5 and 97.4)%,(71.4 and 95.2)%after increasing the applied microstrain from(250 to 400 and 750)μƐfor control mixture and for mixtures subjected to shortand long-term ageing processes *** fatigue-life increased by(142.8 and 257.1)%,(34.4 and 57.8)%and(10 and 30)%when the asphalt content increased from(4.4 to 4.9 and 5.4)%for specimens practicing the applied microstrain of(250,400 and 750)μƐ*** can be concluded that the fatigue life increases by a range of(two to fifteen)folds when the testing temperature increases from(5 to 20 and 30)℃ respectively.

关键词： Fatigue life Asphalt concrete Flexure strain Ageing Temperature Strain level

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Impact of Compaction Mode on Strength Properties of Sustainable Asphalt Concrete

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Journal of Architectural Environment & Structural Engineering Research 2021年第4期4卷 3-9页

作者： Saad Issa sarsam sarsam and associates consult bureau sacb BaghdadIraq

Various modes of compacting the asphalt concrete mixture can create mechanically different behaviour of the prepared specimens and can alter its *** attempt has been made in the present assessment to prepare asphalt concrete specimens by implementation of three modes of compaction,the gyratory,the roller,and the Marshall *** specimens were prepared at the target bulk density of Marshall method at optimum asphalt *** specimens were prepared at 0.5%asphalt below and above the *** specimens have been obtained from the roller compacted slab *** specimens were tested for the Marshall stiffness,tensile,and shear *** was observed that at optimum asphalt content,the indirect tensile strength declines by(18.8 and 70.5)%for gyratory and roller compacted specimens respectively as compared with hammer compacted *** optimum asphalt content,the shear strength declines by(70.5 and 82.2)%while Marshall stiffness declines by(10.2 and 44.8)%for hammer and roller compacted specimens as compared with that of gyratory compacted *** prepared by gyratory compaction are less susceptible to the change in the testing temperature as compared with other modes of *** is recommended to consider the mode of compaction to suit the required design property of sustainable asphalt concrete mixture.

关键词： Sustainable asphalt concrete Compaction mode Tensile Shear strength Marshall stiffness

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Modeling the Impact of Testing Mode on the Viscoelastic Behavior of Asphalt Concrete

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Journal of Smart Buildings and Construction Technology 2023年第1期5卷 16-23页

作者： Saad Issa sarsam sarsam and associates consult bureau(sacb) Baghdad10081Iraq

The variations in the viscoelastic characteristics of asphalt concrete due to testing mode are assessed and modeled in the present *** concrete mixture was prepared at its optimum asphalt binder requirement and compacted in slab mold with the aid of roller *** specimens of 6.2 cm width,5.6 cm depth,and 40 cm length,were obtained from the slab samples with the aid of a diamond saw,and tested using controlled stress and strain techniques under dynamic flexural *** viscoelastic properties such as the phase angle,cumulative dissipated energy,permanent deformation,flexural stiffness,and micro strain were monitored and modeled among the two testing *** was noticed that higher micro strain and permanent deformation are detected when testing the asphalt concrete specimens under constant strain ***,higher phase angle,flexural stiffness,and energy dissipation could be observed under the constant stress mode of the test.

关键词： Stress Asphalt concrete Constant strain Phase angle Cumulative dissipated energy Flexural stiffness Deformation

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新型农村合作医疗筹资水平与筹资能力分析

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中国卫生经济 2008年第9期27卷 51-53页

作者：于保荣孟庆跃严非程晓明 Dobberschuetz Karin 山东大学卫生管理与政策研究中心济南250012 复旦大学公卫学院上海200032 AOK-consult GmbH Germany

2006年,全国新型农村合作医疗制度对住院费用的平均补偿水平为23.2%,补偿水平低是新型农村合作医疗制度普遍缺乏吸引力的原因之一。提高补偿水平的基础是提高筹资水平,文章研究的目的是探索目前年人均10.0元的个人筹资标准进一步增加的... 详细信息

2006年,全国新型农村合作医疗制度对住院费用的平均补偿水平为23.2%,补偿水平低是新型农村合作医疗制度普遍缺乏吸引力的原因之一。提高补偿水平的基础是提高筹资水平,文章研究的目的是探索目前年人均10.0元的个人筹资标准进一步增加的可行性与可能性。研究在山东和宁夏的各3个县中进行,定量调查6147户居民,定性访谈127组对象。研究发现,人均10.0元的筹资水平占居民人均纯收入的0.2%～0.3%;各县分别有20.8%～63.9%的参合家庭愿意多缴纳参合费,这部分家庭愿意缴纳的参合费平均额为24.5～63.5元;各县人均愿意缴纳参合费的最高额为200.0～1000.0元;各县购买商业医疗保险的人口比例为5.7%～28.0%,年人均缴纳的商业保险费用为280.1～844.2元。不同的利益相关者都认为进一步提高个人筹资额是可行的,作者认为将参合费提高到50.0元是可行的。

关键词：新型农村合作医疗保险费医疗保险筹资

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