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Method for determining critical volume fraction of asphalt mortar filler

A technology of critical volume and filler volume, which is applied in the direction of analysis of materials, preparation of test samples, flow characteristics, etc., can solve the problems of no specific distinction, etc., and achieve accurate and reliable results and simple calculation formulas

Active Publication Date: 2017-01-04
CHANGAN UNIV
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Problems solved by technology

The current research only broadly shows that the particle reinforcement of asphalt mortar is the result of the interaction between filler particles and the interaction between asphalt and filler, but does not specifically distinguish when the filler volume fraction is in a certain range. , the enhancement of the complex modulus of asphalt mortar is dominated by the asphalt / filler interaction or the reinforcement effect of filler particles

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  • Method for determining critical volume fraction of asphalt mortar filler
  • Method for determining critical volume fraction of asphalt mortar filler
  • Method for determining critical volume fraction of asphalt mortar filler

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Embodiment Construction

[0019] The technical solution of the present invention will now be further described in conjunction with the drawings and embodiments.

[0020] In the present invention, the two stages in which the complex modulus of asphalt mortar changes with the filler volume fraction are respectively defined as "dilution stage" and "aggregation stage", and the filler volume fraction corresponding to the turning point of the two stages is defined as filler critical volume fraction Φ m ,like figure 1 shown.

[0021] In the dilution stage, the volume fraction of the filler is small, and the asphalt content is more than enough to wrap the filler in the form of a single particle, forming a "structural asphalt" on the surface of the filler, and the "structural asphalt" has a higher viscosity; the remaining asphalt will be The filler particles spread out to form "free pitch", the particles are far apart and do not touch each other, so filler particle interaction has not yet occurred. Therefore,...

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Abstract

The invention relates to a method for determining the critical volume fraction of asphalt mortar filler. The method includes the steps of firstly, preparing a series of asphalt mortar samples; secondly, measuring complex moduli G* of all the asphalt mortar samples obtained in the first step through a dynamic shear rheometer; thirdly, fitting a nonlinear function between the filler volume fraction and the complex moduli G* through Origin software according to the filler volume fractions of the series of asphalt mortar samples and the corresponding complex moduli G*, and then determining the filler critical volume fraction phi m of asphalt mortar. By determining the filler critical volume fraction, it can be clearly known that when the filler volume fraction is within a certain determined range, which of asphalt / filler interaction and filler particle interaction has a leading effect on the enhancement of asphalt mortar complex moduli and has a positive effect on the research of asphalt mortar performance; meanwhile, the calculation formula of the filler critical volume fraction is simple, the fitting process confirms to the reality, and the result is precise and reliable.

Description

technical field [0001] The invention belongs to the technical field of asphalt mortar performance research, in particular to a method for determining the critical volume fraction of asphalt mortar fillers. Background technique [0002] According to the theory of composite materials, asphalt mortar can be regarded as a particle-reinforced composite material, including asphalt (matrix phase), filler particles (reinforcing phase) and interfacial phase formed through interaction. Existing studies have shown that the internal interaction of asphalt mortar composite system is relatively complex, and there are asphalt / filler interaction and filler particle interaction, etc., and all of them are related to the volume fraction of filler. The present invention proposes a filler critical volume fraction and a method for determining the filler critical volume fraction, and evaluates the relationship between the filler volume fraction, filler particle interaction, and asphalt / filler inte...

Claims

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Application Information

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IPC IPC(8): G01N11/00G01N1/28G01N1/38G01N1/44
CPCG01N1/28G01N1/38G01N1/44G01N11/00
Inventor 张久鹏胡壮朱存贞王鹏志刘国强谭好奇李雪倩屈甜裴建中
Owner CHANGAN UNIV
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