A Method for Measuring Solid Surface Free Energy Using Adsorption

Abstract

The invention discloses a device and method for measuring solid surface free energy by adsorption, the purpose of which is to directly test the surface energy of aggregates and other solids, so as to quickly and effectively complete the water damage performance evaluation of asphalt mixture. The adopted technology The scheme is: 1) put the prepared sample in the vacuum chamber; 2) release the probe vapor into the vacuum chamber, keep the vacuum chamber at a constant temperature, measure the probe vapor adsorption on the surface of the sample, and measure the probe vapor at the same time. pressure, to establish the isotherm of the relationship between the probe vapor adsorption amount and the relative vapor pressure; 3) the probe vapor is passed into the vacuum chamber to reach the saturated vapor pressure, and the diffusion pressure of the probe vapor under the saturated vapor pressure is calculated, and the probe vapor pressure is used to 4) use the diffusion pressure of the probe vapor under the saturated vapor pressure and the known surface free energy of the probe vapor to obtain a linear equation, and obtain the surface free energy of the sample. can.

Description

technical field [0001] The invention belongs to the field of asphalt mixture road performance evaluation, in particular to a device and method for measuring solid surface free energy by adsorption. Background technique [0002] Asphalt mixture is widely used in the field of road engineering in my country and occupies an important position in pavement materials. In recent years, the water damage problem of asphalt mixture has become more and more prominent, and the study of aggregate surface energy measurement is beneficial to the evaluation of water damage resistance of asphalt mixture. Aggregate particles have different shapes, angularity, and surface textures. These properties reflect the size, angularity, and surface irregularities of aggregate particles, making the surface of aggregates uneven, making the surface energy test difficult and complex. At present, there is no simple and accurate method to measure the surface energy of aggregates, so it is necessary to introd...

AI Technical Summary

Problems solved by technology

Aggregate particles have different shapes, angles and surface textures. These properties reflect the size, angle changes, and surface irregularities of aggregate particles, which makes the surface of aggregates uneven, making its surface energy testing difficult and complicated.

At present, there is no simple and accurate method to measure the surface energy of aggregates, so it is necessary to introduce a practical and efficient method for testing the surface energy of aggregates and corresponding devices.

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