Physical bite is also one of the important principles of the strength of the pressure generation. Most solid waste particles and cement particles are irregularly shaped, only fly ash spheres spherical. When these materials particles are loose state, there is no interaction between them bite each other is no bite force. While under pressure, they are compacted fill each gap, the naturally occurring physical occlusion effect. The greater the pressure, the stronger the effect of various bite. The so-called occlusion effect is generated interlocking resistance. It is this resistance to connect them together, so that any one of their individual particles are difficult to separate. If one of the particles to be separated in force, will also be other particles bite force barrier. Pastes from the bite on the strength of this connectivity between the particles. Bite for cooperation on particle shape and surface roughness. The more irregular particles, the more rough surface, the stronger its effect bite. Spherical and smooth surface of the particles, the occlusion effect is relatively weak. According to this principle, the choice of irregular particles and surface roughness of the material, unburned strength will be better.

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