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The chemical properties of fly ash depends on the type of coal as well as the methods used for its handling and storage.
Calcium amount in fly ash has prominent effect on the properties of fresh mixture and final hardened product.
Pozzolans are the siliceous or siliceous and aluminous materials which does not show cementitious properties alone but when activated in finely divided form with alkali hydroxide at ordinary temperature and moisture conditions form the compounds show cementitious properties.The loss on ignition (LOI) of the fly ash is a critical factor for assessing its geopolymerization potential.The unburned carbon in fly ash absorbs activator solution.
The particle size distribution of fly ash is an important physical property affecting its reactivity and the properties of geopolymer [9].
Eklund, "Factors affecting the suitability of fly ash as source material for geopolymers," Fuel, 89 (2010) 992-996

The homogenization allows to predict the elastic properties of the composite (effective properties) using knowledge of the elastic properties of each phase and the reinforcement scheme [1].
Strength of composite materials depends on a number of physicochemical and technological factors, related to each other [2, 3].
Adhesion is usually called surface phenomena, which consist in establishing the mechanical strength between two contact phases.
According to the presented dependences, the contribution of the elastic properties of the reinforcing phase (glass microspheres) to the elastic properties of the composite is overestimated.
A theoretical study of the effect of an interfacial layer on the properties of composites.

Such biaxial stretching limits are very sensitive to inhomogeneity with length scales greater than about half the sheet thickness, and significant factors in that inhomogeneity are the materials grain size and the spatial segregation of texture.
Differing orientations (and possibly sizes) of the constituent grains lead to a spatial variation of mechanical response.
Previous work on the aluminium alloy used here [9] indicated that the clustering of texture components affects the relationship between grain size and limit strain.
Results from MK models [9] show that the balanced biaxial limit strain increases indefinitely as the defect size- related here to grain size divided by thickness- is reduced, but the plane strain limit quickly saturates at a level determined by the gross material properties.
The geometry of the spatial distribution and better metrics of local mechanical response need to be included if that is to be achieved.

Material’s hydrophobicity depends on the tension between water and solid surface, and two factors should be included: the surface free energy and roughness.
When the concentration to 1.5mol/L, surface with distribution uniformly of micron structure is obtained, the water gas area is larger than the water surface area, the super hydrophobic properties are gained.
The Influence of the Roughness Factor on the Surface CA.
It can be deduced that the surface roughness can amplify the hydrophilic /hydrophobic properties of the surface material.
It can be seen that the surface roughness can amplify the hydrophilic /hydrophobic properties of the surface material.

Strength is the most important mechanical property of the concrete and this property enables it to be resistant against the effects of outer forces.
Strength can’t be considered as a constant value, it is dependent on many factors.
The mechanical properties of UHPC are predominantly determined by the quality of the transition zone between gravel and cement.
Vibration was used for the third compound but during the vibration the incorrect direction of the fine wires occurred, which affected the test results negatively, mostly the mechanical properties of the material.
Effects of Different Types of Steel Fibers on the Mechanical Properties of High Strength Concrete, Advanced Materials Research 1054 (2014) 80-84

Introduction The major failure modes of metal material such as fatigue, corrosion and abrasion began at the surface of metal material, so the structure and properties of the metal material surface directly affect the comprehensive performance of materials.
The shock wave generated modifies the surface microstructure, surface morphology and properties of metallic targets such as hardness, fatigue and corrosion resistance.
The increased compressive residual stress depth produced by laser peening can significantly improve properties and control the development and growth of surface cracks.
Research Status of Laser Shock Processing Research Status of Laser Shock Processing Abroad.For the first time the microstructure of aluminum alloy 7075 was modified to improve its mechanical properties with high power laser pulse of shock wave at Battelle Columbus Laboratories in 1972.
Moreover, laser shock processing has been shown to harden the surface and improve the mechanical properties of some structural metal components.

The maintenance of proper mold temperature through a temperature control system can reduce the warp of plastic parts and also enhance the mechanical properties dimensional accuracy and stability of plastic parts [3].
Table 9 Experimental factors level Level Element a b c d 1 4 1.8 15 0.1 2 6 2 20 0.05 3 8 2.2 25 0.01 From the relevant data of experimental factors and regardless of the interactions between various factors, the orthogonal experiment table of was selected.
The various factors and test index of the factors of different levels were calculated.
Calculated the range values of column factors: Ri=max ki- min ki (i includes：a, b, c, d).
So, the optimal combination for the selected factors is c3 a1 d2 b3.

This paper focuses the technology and understanding of the grain properties and grain conditioning procedures.
On account of its structure and surface properties and also low heat conductance, grain offers the ideal conditions for cooling process.
A full understanding of technology of silo and handling plant design which takes account of the relevant physical properties of the grain storage under varying environmental conditions during storage is essential.
The most critical physiological factors in successful grain storage are the moisture content of the crop.
Another major factor influencing spoilage is temperature.

As many factors of fillers have effects on the thermal conductivity of the composites, such as type, content, particle size, particle distribution, it is necessary to choose suitable fillers.
Figure 3 shows the mechanical properties of GR/CF/PP composites.
Furthermore, the mechanical and thermal properties of composites were also tested. 1.
A review on the mechanical and electrical properties of graphite and modified graphite reinforced polymer composites[J].
Electrically and thermally conductive polyethylene/graphite composites and their mechanical properties[J].

The weld region is comparatively weaker than other regions for some reasons like residual stresses and hence the joint properties are controlled by the weld region of chemical composition and microstructure.
The grain size of the weld region also plays a major role in deciding the joint properties.
[2] Zhang M., 2000, Improved microsructure and Properties of 6061 Aluminium Alloy Weldment Using a Double–Sided Arc Welding Process, Metallurgical and Materials Transaction, 31, 2537-2544
[6] Lakshminarayanan A.K., 2009, Effect of Welding Processes on Tensile Properties of AL 6061 Aluminium Alloy Joint, Manuf Technol 40, 286-296
[7] Mondolfo L., 1997, Aluminium Alloys–Structure and Properties, Butterworth-London