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For size effect on quasi-brittle materials such as concrete, related researches have been carried out for many years, but related test study combined with concrete structures or components are not sufficient.
Concrete is a quasi-brittle materials, it must exist size effect on strength in theory.
Sichuan Building Science. 2010, 36(2):72-75 (in Chinese) [2] S.B.
Journal of Basic Science and Engineering. 1998, 6(1):77-82 (in Chinese) [3] F.
Journal of Wuhan University of Technology. 2010, 32(11):58-61 (in Chinese) [5] Q.Q.

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Welding is one of the most important ways to connect metal materials.
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Materials and methods Materials.
Table 1 Extraction yields of various extracts from laoying tea Solvent YieldA(g) Extraction B (%, w/w) Cold water 2.14±0.06 21.44 b Hot water 2.35±0.11 23.53 a Ethanol 1.08±0.10 10.85 c A Extracted from aired-dried materials (10.00g).
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Zheng: Machining Technology of Hard to Cut Materials (National Defense Industry Press, Beijing 2008) ].
Holmquist: An Improved Computational Constitutive Model for Brittle Materials: High Pressure Science and Technology, New York, AIP Press (1993) ].Concerning the behavior of the work piece material during machining, a JH-2 material model was used to simulate the fracture behavior of brittle materials under high velocity penetration.
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Johnson: Characterization and Evaluation of Silicon Carbide for High-Velocity Impact: Journal of Applied Physics Vol. 97 (2005) No.9, p. 1-12. ] and shown in Table 3.
Chips of brittle materials under large amounts of observations show that the removal way of ceramics is mainly brittle fracture.

Acknowledgement The reported study was funded by FSBEI HE DSTU under the University Grants for Scopus and Web of Science publications.
Nazhuev, Theoretical and practical aspects of the variational structure formation of centrifuged products from heavy concrete, Materials Science Forum. 931 (2018) 502-507
Kholodnyak, Investigation of the influence of the initial composition of heavy concrete designed for the manufacture of ring-section products on its properties, Materials Science Forum. 931 (2018) 508-514
Zholobova, Setting and technological aspects of manufacturing high quality centrifuged products and structures from heavy concrete, IOP Conference Series: Materials Science and Engineering. 463 (2018) 022056
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Study on the Adhering Disrepair and Groove Optimization of Cutting Tools for Difficult-to-machine Materials Z.J.
Acknowledgements This research is supported by the National Natural Science Fund (50275042).
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Recycled tires are generally mixed with other materials such as soil or asphalt to meet the specific needs of the applications in which it is offered.
The structural elements of the building are composed of 5-node plate elements, and the properties of their materials are given in table 2.
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Applied Mechanics and Materials; vol 580–583: 1490–1493, 2014

The observations included negative air ion concentration, positive air icon concentration, wind speed, temperature and relative humidity, and negative air icon concentration in materials and plants.
The main observation contents are positive and negative ions concentration in the air, wind speed, air temperature, relative humidity, anion concentration in plants and building materials, etc.
Japanese made Ion Tester COM-3010PRO is used to test the anion concentration in plants and materials, 20 seconds for one data and take the peak number, 3 data for each test.
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Journal of Natural Resources, 2006,21(6):991-996.

Sanchez “Advanced cutting conditions for the milling of aeronautical alloys”, Journal of Materials Processing Technology. 2000, Vol. 100, pp. 1-11
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Liao, Study on wear mechanisms in drilling of Inconel 718 superalloy, Journal of Materials Processing Technology. 2003, Vol. 140, pp. 269-273
Teo, “The machinability of Inconel 718”, Journal of Materials Processing Technology. 1997, Vol. 63, pp. 199-204
Khamba, ”Taguchi technique for modeling material removal rate in ultrasonic machining of titanium”, Materials Science and Engineering A. 2007, Vol. 460-461, pp. 365-369