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The breakdown and the reconstruction of the internal structure of asphalt were studied by means of measuring and examining the variation in viscosity with changes in shear conditions.The following results were obtained:The breakdown of the internal structure with a shear corresponds to the extent of non-Newtonian viscosity given at the shear condition. Namely, in the Newtonian or very poor non-Newtonian viscosity region, the breakdown of structure takes place to some extent, but it balances roughly with the reconstruction. On the other hand, in the strong non-Newtonian viscosity region the breakdown of structure is remarkable.The change of the structure with temperature changes is also similar to that with shear rate changes. In the lower temperature range the breakdown and the reconstruction of structure are balanced and the broken structure with rising temperatures recovers almost simultaneously with lowering temperatures. But a considerable breakdown takes place in the internal structure when the temperature goes up higher than the softening point of the asphalt, and the reconstruction of structure takes some time to complete even if the temperature is subsequently lowered to level.These tendencies mentioned above are irrespective of the type of asphalt.The structure change with shear and/or temperature is reversible. Judging from the internal structure models discussed in the previous paper, the breakdown of structure results from the desorption of resinous matter and destruction of the cohesion of asphaltene micelles, and the reconstruction results from the readsorption of resinous matter and the re-aggregation of micelles.
- 公益社団法人 石油学会の論文
公益社団法人 石油学会 | 論文
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