Papers by Keyword: Long-Term Properties

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Authors: Li Qiao, Hui Huang Yang, Jian Feng Sheng
Abstract: Friction-weld Cu-Al has many potential applications to replace the traditional Cu or Al conductor as it has the superior performance and low cost. For ensuring the reliability of Al/Cu metal joints, the mechanical, electrical and long-term properties were investigated by comparing the properties of Cu and Al. The results show that the mechanical properties (tension, impact and hardness) of friction-welded Cu-Al are between the values of Cu and Al, and the welding seam is not the weakest part in mechanical. The electrical resistance of Cu-Al is also between the values of Cu and Al, and does not increase after long-term vibration test and high-low temperature cycle test. The welding seaming is a weak part for salt spray test, it is better to be protected for use.
Authors: Leif Hermansson, T. Björneståhl, Håkan Spengler, Hakan Engqvist
Authors: Jian Zhong Chen, Zhuo Li, Si Rong Zhu, Zhuo Qiu Li, Yue Lin Kong
Abstract: The design life of fiberglass pipe is 50 years. In order to ensure long service life of fiberglass pipe, long-term properties under service conditions is the most important performance. According to the polymer matrix composite material with viscoelastic properties, adopt equivalent principle and shift factors method combined with experiments to study the long term performance of fiberglass pipe, established a relatively simple for fiberglass pipes long-term performance prediction method. The experiments show that compliance of fiberglass pipe with all hoop winding increased by 148% after 50 years in 60% stress level.
Authors: Kuang Liang Qian, Tao Meng, Xiao Qian Qian, Shu Lin Zhan
Abstract: Some long-term properties such as anti-carbonation properties, shrinkage, penetrability of chloride ion of fly ash concrete with nano-CaCO3 middle slurry were studied. Test results showed that the properties of anti-carbonation and impenetrability for chloride of fly ash concrete increased by adding nano-CaCO3 middle slurry because the tiny hole was filled by nano-CaCO3 and the density of concrete increased. But at the same time, the shrinkage of fly ash concrete with and without nano-CaCO3 was the same. Results of SEM also implied the hydration degree of fly ash could be increased by nano-CaCO3.
Authors: Tomáš Daněk, Jan Thomas, Jiří Mališ, Jan Jelínek
Abstract: The paper deals with the properties of mixtures on the base of fly ash and sludge from the metallurgical production. The mixture composition of this group is grounded in the knowledge acquired during testing of various mixtures. The mixtures of sludge and coal fly ash and/or cement after of curing were used for tests. The uniaxial compressive strength of solidified sludge was examined. To understand the behaviour of mixtures in the long term, the prepared mixtures were tested after 14, 28, 56 and 120 days.
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