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废机油底渣对沥青的不利影响及机理初探 被引量:25
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作者 丁海波 邱延峻 +1 位作者 王文奇 张晓靖 《建筑材料学报》 EI CAS CSCD 北大核心 2017年第4期646-650,共5页
为准确预估废机油底渣(WEOB)对沥青长期耐久性的影响,通过在直馏沥青中添加不同用量的废机油底渣来制备改性沥青,并对改性沥青进行不同程度的老化:旋转薄膜烘箱老化(RTFO),压力箱老化(PAV)及扩展压力箱老化(ExPAV).采用双边缺口拉伸(DE... 为准确预估废机油底渣(WEOB)对沥青长期耐久性的影响,通过在直馏沥青中添加不同用量的废机油底渣来制备改性沥青,并对改性沥青进行不同程度的老化:旋转薄膜烘箱老化(RTFO),压力箱老化(PAV)及扩展压力箱老化(ExPAV).采用双边缺口拉伸(DENT)试验的临界裂纹张开位移(CTOD)研究沥青的抗延性断裂性能,采用扩展弯曲梁流变(Ex-BBR)试验得到的分级损失来评估物理硬化对沥青低温可靠性的影响,采用ΔTc指标(蠕变劲度临界温度与蠕变速率临界温度之差)评估沥青的长期耐久性,此外通过原子力显微镜(AFM)观察添加WEOB前后沥青的微观结构形态.结果表明:延长老化时间(ExPAV)可以更明显识别WEOB对沥青低温性能的不利影响,而常规沥青老化时间(PAV)并不能明显捕捉这种不利影响;添加WEOB会使沥青产生物理硬化并导致抗延性断裂性能降低;WEOB可使沥青中蜡晶粒明显增加,而蜡晶粒的低温结晶及其相界造成的应力集中是导致废机油底渣长期低温性能降低的主要原因. 展开更多
关键词 道路工程 废机油底渣(WEOB) 机理 延长老化
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Nuclear power plant life extension:How aging affects performance of containments & other structures
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作者 Robert A Dameron Sun Junling 《Engineering Sciences》 EI 2013年第3期39-52,共14页
This paper focuses on how aging can affect performance of safety-related structures in nuclear power plant (NPP). Knowledge and assessment of impacts of aging on structures are essential to plant life extension analys... This paper focuses on how aging can affect performance of safety-related structures in nuclear power plant (NPP). Knowledge and assessment of impacts of aging on structures are essential to plant life extension analysis,especially performance to severe loadings such as loss-of-coolant-accidents or major seismic events. Plant life extension issues are of keen interest in countries (like the United States) which have a large,aging fleet of NPPs. This paper addresses the overlap and relationship of structure aging to severe loading performance,with particular emphasis on containment structures. 展开更多
关键词 NPP structure performance plant life extension finite element analysis corrosion CONTAINMENT severe accident seismic event
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