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Because of their strong corrosion resistance,20 steel is extensively used as ground grid materials[1].
[3] CHEN Xu,DU Cuiwei,LI Xiaogang.Influences of water content on the corrosion behavior of X70 steel in Dagang Saline-alkaline soil[J].Journal of University of Science and Technology Beijing,2008,30(7):730-734
(Nature Science Edition),2002,30(7):104-107
[6] Wang Y H,Zhang G Y,Lu Z H et al.Regularity of soil corrosion of Pb,Al,Cu with climate[J].Journal of Chinese Society for Corrosion and Protection,2007,27(6):326-328
[8] I.S.Cole,D.Marney.The science of pipe corrosion:A review of the literature on the corrosion of ferrous metals in soil[J].Corrosion Science,2012,56(3):5-16

Journal of Alloys and Compounds.
TRANSACTIONS OF MATERIALS AND HEAT TREATMENT.
Journal of Manufacturing Science and Engineering.
CHINESE JOURNAL OF LASERS.
Advanced Materials Research.Vol. 189-193 (2011),p340-346.

Methods and materials Materials Figure 1 shows the gradation curve of the reinforced soil.
In the case of same soil type, the nature of reinforcement materials plays a vital role in reinforced soil.
It is because the difference of reinforcement materials.
Metallurgical ansd Materials Transactions.
Journal of Materials Science. 40(2005), p. 2987-2989

Introduction For lots of advantages of concrete pipe pile,such as short construction period,high strength,guaranteed quality,easy detection, low cost,et,al,it has been used in civil engineering widly.According to achievements in stress which decline fastly form pile top to tip of pile foundation[1-3], it is obviorous waste to design cross-section of pile as uniform cross-section which can not function bearing ability of pile body material adequately.For function adequately the advantages on construction of pipe pile,improving efficiency of material and declining construction cost,step cross-section pipe pile which is connected by two or more concrete pipes with different diameters is put forward by our research group.There are a lot research fruits on compaction effect of jacked pipe pile by at home and abroad.
not reach position of valialbe cross-section,penetration resistances of setp cross-section piles are lower than unimate cross-section piles by comparing 1# pile and 2# pile with 3# pile and 4# pile respectively.After penetrtion depth reach position of valiable section,the penetration resistances of setp cross-section piles are higher than unimate cross-section pile and have 14.3 percent and 13.3 percent increase respectively.Thirdly,comparing curves of 1# pile to 5# pile,there are found that the maximum penetration resistances are 10540N,8000N,11810N, 9110N and 8320N respectively and the penetration resistances per unit volume are 0.652 N/cm3 , 0.674 N/cm3,0.716N/cm3,0.746 N/cm3 and 0.776 N/cm3 respectively.Finally,if the ratio of diameter difference of big and small pipe and average diameter of setp cross-section pipe pile is defined as valialbe section ratio,the valialble section ratios of 3# to 5# piles are 0.286,0.333 and 0.545 respectively and it is obvirous that the efficiency of material
Acknowledgements This work is financially supported by national natural science foundation of china(project No. 51208194) and natural science foundation of hunan province(project No. 2015JJ5017).
References: [1] S.L,Sun: submitted to Journal of railway engineering society(2011) [2]X.R.Zhu,P.F.Fang and H.M.Huang:submitted to Chinese journal of geotechnical engineering, (2003) [3] P.Ren,R.G.Deng and Z.Q.Yu: submitted to Rock and Soil Mechanics(2010) [4]E.P.Heerema,D.A.Jong.International Conference on Numerical Methods in Offshore Piling(1980), p.37 [5]Y.K.Chow,I.M.Smith.
International Conference on Application of Stress-wave Theory on Piles(1985), p.319 [6]H.H.Zhu,Y.J.Xie and H.Z.Wang: submitted to Chinese Journal of Geotechnical Engineering, (2004) [7]S.B.Yang,Y.D.Li:submitted to Geotechnical Engineering Technique(2006) [8]J.J.Zheng,C.J.Nie and Y.E.Lu: submitted to Chinese Journal of Rock Mechanics and Engineering(2006) [9]Y.H.Liu,Z.Z.Chen and Z.J.Peng: submitted to Rock and Soil Mechanics(2007) [10]Y.Guo,W.Cui: submitted to Journal of hefei university of technology(2010) [11]B.He,Y.Yu and Z.C.Wang: submitted to Journal of Water Resources and Archi- tectural Engineering(2010)

Studies on the vibro-acoustic characteristic of cylindrical hull structure with damping materials have been carried out by domestic and overseas scholars.
Article [2] presents a vibration and sound radiation experiment of a double hull cylindrical shell structure covered with decoupling material.
Journal of Sound and Vibration, 1995, 186(5): 723~742
:Journal of Huazhong University of Science & Technology, 2011, 39(4): 106-109.
(in Chinese) [7] Lou Zhong,ZhuXi,LIN ZhiTuo,WANG WeiZhong:Ship Science And Technology,2009,31(8):23-29.

Materials Science and Engineering.
Materials Letters. 59 (2005) 2932-2935
Materials and Design. 46 (2013) 285
Materials Research Bulletin. 48 (2013) 1720-1724
Journal of Materials Processing Technology. 209 (2009) 561-571

First, the composition of concrete materials such as aggregate, sand and cement is different in chemical component and mineral composition, the difference between content and age and the differences of mechanical properties makes the physics function and chemistry function to be different when under high temperature.
Concrete is hot inert materials, and it has low heat transfer coefficient, this article heat up the concrete specimen by microwave oven, as Fig. 1 shows.
) [2] Schneider U: Concrete at High-Temperature-a General ReView (Fire Safety Journal, 1988, 13( 1):55-68
) [3] Liu Lixian, Lv Long, Liu Zheng, Wang Haiyin: Study of the mechanical properties of concrete under and afteg high temperature (Science of building, 1993,25 (3) : 16-20
Guise: Assessment of fire damaged concrete using colour image analysis (Construction and Building Materials, 2001,(15):9-15

Determination of ZrO2 and TiO2 in Alkali-Resistant Fiberglass Mesh by ICP OES Qingdan Yuan a*, Lin Congb, Peng Chenc, Shihua Liud and Qiannan Lie China Building Materials Academy, China Building Materials Test & Certification Group Co.
It is widely used in reinforcing walls, plaster board, artificial stone materials, and exterior insulation system, roofing, etc. [3].
The content of ZrO2 and TiO2 were requested in JC / T841-2007 "Alkali-resistant fiberglass mesh", which is the current building materials industry standard.
Journal of Shaanxi University of Science & Technology (Natural Science Edition), 29(2011): 5-8
Journal of the Chinese Ceramic Society 1 (1987): 61-68

Due to short shelf life of raw material and final product, using this network structure helps the case company in handling uncertainties in demand and supply.
For example, if there is a surplus or a shortage of raw material, production capacity can be relocated between regions.
But in regions where there is an imbalance in the supply of raw materials and production capacity, and there is a need to transfer products, responsiveness may decrease.
Strandhagen, "Production planning for production network," Department of Production and Quality Engineering, Norwegian University of Science and Technology, Ongoing Ph.D.
Ackoff, Towards a System of Systems Concepts: Institute of Management Sciences, 1971

If a smaller size of sheet is selected, it helps save materials and to reduce costs.
Li: International Journal of Pressure Vessels and Piping Vol. 79(4) (2002), p. 289-296
Hardt: Journal of Manufacturing Systems Vol. 17(6) (1998), p.436-454
Kirt: Journal of Manufacturing Systems Vol. 17(4) (1998), p. 287-296
Papazian: Journal of Manufacturing Science and Engineering Vol. 125(2) (2003), p. 333-343.