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Research on Fractal Characteristics of Cement-Based Materials by Nitrogen Adsorption Method TANG Minga,LI Jingqib School of Material Science and Engineering, Shenyang Jianzhu University, Shenyang, Liaoning, 110168, China atm24690309@126.com, blijingqi2469@126.com Keywords: cement-based materials; pore; fractal; nitrogen adsorption Abstract：In order to confirm the surface fractal dimension of the internal pore of complex porous materials by means of the FHH model and nitrogen adsorption method.
The complexity ,the particularity in macroscopic and microscopic structure ,the universality of use parts of the constituent materials, which determine the concrete materials science had to depend on the latest research results of various disciplines of cross to improve their own.
Concrete materials fractal theory can be used to be a new branch of materials scientific researching, as following the materials science, micromechanics, fracture mechanics, cement chemistry, rheological etc.
Pore structure characteristics is a important issue about cement-based materials science study.
From now on, in the cement concrete materials science study, pore characteristics and pore structure theory research become a focus.

Effect of Ca doping on crystal structure of the misfit-layered Bi-Sr-Co-O thermoelectric materials Xuelian Tang1, a,Kunyu Zhao1*,b, Zhidong Li1,c and Zhaobiao Meng1,b 1 Faculty of Materials Science and Engineering,Kunming University of Science and Technology, Kunming,China atangxuel@163.com, bkyzhaoy@yahoo.com.cn, cleezd@126.com * Corresponding author Keywords: Bi -Sr-Ca-Co- O;Thermoelectric material; XRD; Crystal structure Abstract.
The Bi-Sr-Ca-Co-O ceramics materials were prepared successfully by Masaki et al. in 2000.
Experimental 2.1 Sample Preparation Bi2O3,SrCO3,Co2O3 and CaCO3 powders were used as starting materials[4].
Thermoelectric materials: new approaches to an old problem, J.
Preparation and Study of Co-based oxide thermoelectric materials, Kunming, 2006 [7] T.Yamamoto, I.Tsukada, et al., J.

Table 1 Mechanical properties of the materials used in the current analysis.
Dental Materials : Official Publication of the Academy of Dental Materials. 21(8): 709-715, 2005
Materials Letters. 29:215-220, 1996 [28] G.H.
Dental Materials Journal. 31(2): 171-179, 2012 [30] Hong, S.Y, Lisa, A.L.
Journal of Prosthetic Dentistry. 85: 558-567,2001

Journal of Macromolecular Science, Part B: Physics, 53(4), 645–661. https://doi.org/10.1080/00222348.2013.860304 [5] Dolog, R., & Weiss, R.
Journal of Polymer Science, Part B: Polymer Physics, 51(13), 1033–1040. https://doi.org/10.1002/polb.23301 [10] Kow, Y.
Journal of Materials Science, 55(25), 10975–11051. https://doi.org/10.1007/s10853-020-04761-w [13] Meng, Q., & Hu, J. (2009).
Journal of Polymer Science, Part B: Polymer Physics, 56(8), 673–688. https://doi.org/10.1002/polb.24578 [15] Safranski, D., & Griffis, J.
Journal of King Saud University - Science, 29(4), 494–501. https://doi.org/10.1016/j.jksus.2017.09.003 [18] Wu, X.

The production of confined or adsorbed drugs in inorganic matrix has been increasing in areas like material science and pharmaceutical due to the possibility of the production of nanoadsorbed or encapsulated molecules with new properties like chemical stability, enhancing solubility and controlled release, what implies in new applications of materials.
Nanoparticles are tiny materials with specific physicochemical properties different to bulk materials of the same composition.
Results and discussion SEM The materials surface has a high porosity level, as can be seen through the SEM analysis, Figure 2.
AST - Advances in Science and Technology. , v.45, p.260 - 265, 2006
XPS study of the major minerals in bauxite Gibbsite, bayerite and (pseudo-)boehmite, Journal of colloid and interface Science, v. 296, p.572-576, 2006

Current PCM used in the construction field lays in mainly three ways:ⅰ, direct mixed in building materials;ⅱ, the application of PCM in building materials by impregnation method; and ⅲ, shape-stabilized PCM used in building materials.
Because slag-water glass-gypsum binder and building materials are all inorganic materials, the compatibility of these materials is good.
Micro-encapsulated phase-change materials integrated into construction materials, Solar Energy Materials and Solar Cells. 89 (2005) 297-306
Feasibility Analysis on Phase Change Cooling Storage in Large Day-and-Night Temperature Difference Area, Journal of Shenyang Jianzhu University(natural science). 21 (2005) 350-353
Phase change material as a thermal energy storage material for cooling of building, Journal of Theoretical and Applied Information Technology. 4 (2005) 503-511

Journal of Applied Mechanics, 57(4):916-922, 1990
Computer Modeling in Engineering & Sciences, 1(3):91-99, 2000
Fracture analysis of cracked thermopiezoelectric materials by BEM.
Electronic Journal of Boundary Elements, 1(2): 2007
Fracture of magnetoelectroelastic composite materials using Boundary Element Method (BEM).

At present, the calcium silicate products industry as a whole is lag behind developed countries, and poorly equipped, low content of science and technology, single technology, product performance is not stable and so on.
Experiment Experiment materials Calcareous material: the calcareous material for quick lime used, the limestone under 1000 ℃ calcination.
Experiment Results and Discussion Effect of stirring technology on properties of calcium silicate insulation materials Dynamic hydrothermal method as opposed to the static method, namely stirring the slurry constantly under the conditions of high temperature and high pressure, and the solid particles suspended in a solution, ensures the reaction between materials.
Effect of fiber adding process on the performance of calcium silicate insulation material Admixture Follow-up process Siliceous materials Carbon fiber Mixed Calcareous material Water Pressing Slurry Dynamic hydrothermal reaction Fig. 2.2 The fiber and concrete mixing process Compact structure of carbon fiber causes the existence of molecular forcestrong its intermolecular, the carbon fiber in the matrix is extremely easy to wound and reunion, the formation of local structural defects could not improve the role but greatly reduce the comprehensive properties of the materials.
References [1] Liu Xi-tai: Energy Saving of Non-Ferrous Metallurgy, (1999), p.1-4 [2] Ni Wen, Zou Yi-ping, Chen De-ping: Journal of Mineralogy and Petrology, (1998), p.28-30 [3] Ceng Wen-zhi: Guangdong Building Materials, (2000), p.25-29 [4] Xing Feng: Journal of the Chinese Ceramic Society, (2000), p.116-124

It's shown that enhancing cohesive zones ductility could improve matrix materials resistance to void damage.
With respect to viscoplastic materials, the crack is not the only failure position.
As the strain rate sensitivity decrease, the materials response approaches the elastic-plastic property.
Interactions between the cohesive fracture process zones and the surrounding materials were studied.
Zavattieri: Mechanics of Materials Vol.35(2003), p.365 [6] A.

The Influence of Professional Shoe Materials for Aerobics on Bounce Action of Athletes Yang Xuelin Department of Basic Science, Taizhou Polytechnic College, China yingyuyingpin2012@163.com Keywords: Materials, Bounce Property, Research, Shoe Abstract.
The material shock absorption of special shoes for aerobics mainly adopts EVA materials.
Journal of Shaanxi University of Science and Technology, vol. 3(2004), p. 169-174
Information in Building Materials Industry, vol. 4(1997), p. 18
[6] Gao Yue: Sports Goods Spur High-tech Materials, Sports Suppliers, Science and Technology. vol. 5(2004), p. 53.