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The grain size of fly ash is predominantly homogeneous, with a very fine size of less than 325 mesh.
Porosity testing is carried out to determine the number of pores contained in the concrete.

Although Table 1 and Figure 2 has shown that gas effective permeability is recovered gradually with displacement time, which reflects reservoir damage be removed, in the actual production of gas process, to really slow down or inhibit particle migration, it must have a comprehensive study on various factors, such as clay, velocity, pressure, pore structure type, grain size and so on.
The causes of the phenomenon of particle migration in Low-permeability sandstone gas reservoirs Affect of velocity sensitivity Low-permeability gas reservoirs often contain different number of sensitive clay minerals, take the 60 experimental natural gas reservoir samples for X diffraction analysis of clay mineral composition, Which show that the average relative content of clay are 29%kaolinite, 26%illite, 30% chlorite, 15%illite/smectite mixed layer; the maximum relative content of clay was 76%kaolinite, 69%illite, 57% chlorite, 72%illite/montmorillonite.

Firstly, a large number of slip-band traces and dimples are witnessed on the specimen surface, which gives enough evidence that the Cu-0.8Cr-0.2Zr alloy possesses good toughness materials.
Structure and properties of ultra-fine grain Cu-Cr-Zr alloy produced by equal-channel angular pressing [J], Acta Materialia 50(7) (2002) 1639-1651

Electrokinetic remediation offers great potential for the remediation of hazardous waste sites, especially those containing fine-grained soils that have been contaminated with Cd.
It is recognized that Cd levels in plants are influenced by a number of factors such as soil properties and the type of crop [17].

The heat generation is expressed as a surface heat flux from the tool shoulder (without the tool probe) and is a function of the tool radius and the temperature dependent yield stress as follows: qsurfaceAr,T=ωrτT=2πn60rσyield3, (1) where n is the number of tool revolutions per minute, r is the radial position originating from the tool center, τ is the shear stress and σyield is the temperature dependent yield stress.
Furthermore, it is difficult to develop such models for the 2024 alloy due to the requirement of accounting for the heterogeneous precipitation that is observed on dislocations, dispersoids and at grain boundaries in this alloy.

Small carbide particles were distributed inside grains of the microstructure of the Fe-Cr-Mo-V-W-C steel matrix.
It contained a greater number of rounded pores in the microstructure.

These advantages can significantly enhance the wear-resisting property of the coatings, as tiny TiC particles can improve yield strength through dispersion and grain size refinement, and can intensify toughness by hindering crack propagation [14].
It is obvious that there formed a large number of patched adhesive pits and loose bits come off soon in cutting off (as shown in Fig. 6a) after the adhesive joint nipped on the softer Q235 steel surface.

The structural models of JCPDS (joint committee on powder diffraction standards) card numbers 9-0169 and 24-033 were respectively used for β-TCP and HA.
In ceramic materials, various parameters influence on the mechanical properties: pore size, pore volume, grain size and preparation method [4].

The individual components of the mixture undergo a number of physical and chemical changes [4].
Each new modification has a greater density than the previous one, this leads to the cracking of sand grains.

Reches (2018) after review of a number of studies on concrete modified with nano-additives noted that despite several decades of research in this direction, the commercialization of nano-additives for cement materials has only recently begun [1].
Adsorbed on cement grains, lignosulfonate molecules push out water molecules and give the solution plasticity.