About Shanghai: "city on rivers"
Shanghai, China's largest modern city, is situated in the middle of China's east coastal line. It covers an area of over 6,340 square miles and has a population of over 15 million. It’s also the largest economic and trade center in the country and a comprehensive industrial base. It is an open city along the coast, as well as a famous historical and cultural city. Shanghai's history of revolution and culture attract tourists home and abroad. Being regarded as "Paris of China" and as the paradise for shopping, Shanghai has become an ideal city for tourism. The Pudong Development Area in Shanghai is an important special economic zone in China. Efforts are being made to develop Shanghai into a modern international economic, financial and trade center.
Welcome to visit Shanghai!
Prof. Igor Ivitsky
National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Ukraine
Biography: Prof. Igor Ivitsky is a professor in National Technical University of Ukraine, Ukraine. He has made some achievements. The highest award for young scientists in Ukraine. Awarded for outstanding achievements in science. The second highest award for young scientists in Ukraine. Won 2 times. Award of the Kyiv mayor for special scientific achievements in the development of the capital of Ukraine. The winner of the contest among university research teaching fellows under 35 years 4 years in a row. The captain of the team that won the 1st place in the All-Ukrainian engineering competitions.
Speech Title: The multidisciplinary task of intelligent polymeric composite materials creating
Speech Abstract: The speech describes intelligent polymeric composite materials production. Surely, this is multidisciplinary question. It includes chemical engineering, microelectronics and non-destructive testing aspects. We conducted simulation, using mathematical models that were previously created. Based on this simulation, processing equipment designs were also developed.
Types of polymeric composite materials (PCM) include materials that are able to transfer their data characteristics remotely, especially in the stress-strain state to conduct online monitoring. This is achieved by intelligent sensors’ introduction into PCM (i.e. small-scale measuring devices). They have structural totality form of one or more measuring size transformers that is calculated and controlled. This sensor produces an output signal, suitable for the transmission and usage in control systems, and it also has normalized characteristics.
Prof. Jianqin Ma
Department of Geotechnical and Tunnel Engineering, School of Highway, Chang’an University, Xi’an, China
Biography: Prof. Jianqin Ma works at the department of Geotechnical and Tunnel Engineering, School of Highway, Chang’an University, China. He is specialized in the fields of tunnel and underground structures, including ground condition evaluation, structure design and quality control in construction, the technical condition assessment of the existing tunnels and concrete structures. He is also active in engineering practice and communication, as a technical consultant, speaker, reviewer or technical committee member, respectively. He has been the author or co-author of more than 70 conference or journal papers and four books in the field of Geotechnical and Tunnel Engineering.
Speech Title: Features of the variation of concrete temperature cracks in tunnel final lining with temperature
Speech Abstract: Safety and durability are of the concern of the involved groups in a tunnel project. The cracks in the cast-in-place concrete final lining should be under control to meet the specified quality control requirement, such as in terms of water leakage preventing and specified durability expectation. However, the cases with defects in lining concrete seem not rare due to various reasons. Although the reasons of the concrete cracking during construction are of project unique, temperature and shrinkage cracking is one of the common reasons in practical cases. Of the temperature and shrinkage cracks, which occur and develop in a cast-in-place concrete lining during construction, is closely related to the features of the constraints to the temperature drop and shrinkage deformation of the concrete. Mainly due to the project unique of the constraints in temperature and shrinkage cracking, the rule on the occurring and developing of the temperature and shrinkage cracks in a cast-in-place tunnel lining concrete needs further study. The post construction variation characteristics of the temperature cracks in concrete lining and the related influencing factors are also attention-attracting. In general, case histories always provide clue to the related problems.
To investigate the post-construction changes of the concrete temperature cracks in a tunnel cast-in-place lining panels, where there are no waterproof and drainage sheets applied in the tunnel composite linings, the seasonal variation of the typical longitudinal, circumferential and diagonal cracks from three lining panels are monitored with surface vibrating wire strain gauges. The results show that the crack widths generally increase with the concrete temperature decreasing, while there are locally step changes in the increment tendency, in autumn and winter; the widths decrease with the increase of temperature in spring and summer; the linear correlation coefficient between crack width and temperature variation is about - 0.01mm/℃. Based on the cracking features and the seasonal variation of the cracks, and the behavior features of the composite lining, the changes of crack widths can be attributed to the thermal expansion and cold contraction deformation of the lining concrete under certain constraint conditions, which is closely related to the structure features of the composite lining of the monitored panels. It is shown that the constraint conditions of the temperature cracks in the cast-in-place concrete lining panels during construction still work in the post-construction period, and present successive and inhomogeneous features. The case results are of significance for analyzing the constraint conditions of the thermal crack formation in cast-in-place lining concrete and concrete temperature crack controlling, as well as the evaluating of the influence of crack width changes on a tunnel safety, in terms of tunnel lining structure design and quality control in construction.