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However, whatever the method of molding products, the solution to the problem of increasing their service life in road surfaces is associated with increasing the homogeneity of the concrete structure and the use of impact-resistant composites obtained by directional structure formation and modification of their structure.
The experiments have shown that it is important to have a rational combination of angular and rolled particles to form a dense structure of hard-pressed fine-grained concretes.
The concrete structure was characterized by the structure of pore volume: surgeless pore size and shape, the size of the total and open porosity, as well as indicators of the material density and strength.
Bogue, The Chemistry of Portland Cement, 2nd Ed.
The Chemistry of Cements.

Siderite beneficiation with magnetic separation-flotation combined method Jinhua Cheng1,2,a, Qinbo Cao 1,2,b*, Meng Wu1,2,c 1 State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China 2 Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan;China aemail: 1091699864@qq.com; bemail: cabdxx@163.com; cemail: 1145607112@qq.com; Keywords： Siderite, Recovery, Flotation, magnetic separation, grade, recovery Abstract：Exploratory experiments were conducted according to the property of a siderite mineral composition and structure has the advantages of simple structure, low grade theory.
Flotation reagent chemistry principles [M].

They are non-crystalline materials with heterogeneous pore structures.
The advance of such understanding relies heavily on the molecular level knowledge of the porous structure according to the structure-property paradigm.
However, the microscopic structure of these materials is still a matter of debate.
It is not observed any crystallography arrangement in this structure.
Berendsen, Computer Simulation of Molecular Dynamics: Methodology, Applications and Perspectives in Chemistry, Angew.

Study on the dielectric properties of phosphoric acid-based geopolymers Le-ping Liu, Xue-min Cuia, Yan He and Jun-li Yu School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China, acui-xm@tsinghua.edu.cn Keywords: Geopolymers; Dielectric properties; Phosphoric acid; Amorphous SiO2 Abstract.
The plane structure diagram of geopolymer molecule is shown in Fig.1.
The plane structure of alkali based geopolymer is observed as the Fig.1A.The charge stabilization of tetrahedral [AlO4] is provided by alkali metal ions.
The plane structure diagram of geopolymer molecule: A alkali geopolymer; B phosphoric acid-based geopolymer.
The local ordering of geopolymer structure was improved so that the dielectric loss was decreased after high-temperature calcined.

The metallographic structure of coating is investigated by MeF3-type (OM) metallurgical microscope.
As shown in Fig. 1(a), boride and carbide structures are distributed in austenitic matrix of Ni60A alloy[4].
Otherwise, the rare earth can structure carbide neat so as to improve its mechanical property, especially shock property [6-7].
Mo and B can preferentially combined into MoB which can prevent the network structure from generating.
Beijing: Chemistry Industry Press, 1999.

Smart Materials and Structures, 1992, 1(1): 91
Smart Materials and Structures, 1992, 1(2): 172
The Journal of Physical Chemistry B, 2009, 113(41): 13551-13559
The Journal of Physical Chemistry A, 2009, 113(44): 12207-12214
The Journal of Physical Chemistry C, 2010, 114(21): 9659-9663

The content of Al effects the type of TiAlN, when the Al concentration (x) was changed from 0 to 0.6, the films were identified as having the cubic B1 structure which is the same structure as pure TiN.
For x exceeding 0.7, only a single phase with the hexagonal B4 structure was observed.
Wu, “The deposition and wear properties of cathodic arc plasma deposition TiAIN deposits,” Materials Chemistry and Physics, Volume 46, Issue 1, pp. 77-83 October 1996
“The preparation of NaCl-type Ti1−xAlxN solid solution,” Journal of Solid State Chemistry, Vol. 68, Issue 1, pp. 124-127, May 1987
[34] Kuiying Chen, and Linruo Zhao, “Elastic properties, thermal expansion coefficients andelectronic structures of Ti0.75X0.25C carbides,” Journal of Physics and Chemistry of Solids, Vol. 68, pp. 1805-1811, 2007.

Composite adsorbents with enhanced selectivity, regeneration, surface area, mechanical strength and surface chemistry have attracted attention amongst others.
Thus, the entire structure was constructed during composite formation with the development of cubic and tetragonal structures as shown in Figure 3a and 3b.
Meyers (Ed.), Encyclopedia of Analytical Chemistry, John Wiley & Sons Ltd., Chichester, 2000
Pittman, Journal of Molecular Structure (Theochem), 281 (1993) 91-96
Karabacak, Journal of Molecular Structure, 985 (2011) 148-156

Makarichev, The technology of cellular concretes and structures.
Skripnik, Formation of the structure of cellular concrete, Building materials. 5 (1974) 25 p
[14] I.I Kurbatova, Chemistry of hydration Portland cement.
Pukharenko, Features of forming the structure of cellular fibrous concrete.
Kornienko, The formation of the optimal structure of cellular concrete.

Because of advanced characterization and new fabrication techniques, nanomaterials are now central to multiple disciplines, including materials science, chemistry, physics, engineering and medicine.
The important and unique properties of TiO2 and ZnO nanomaterials with their possible crystal structures have been discussed.