| 摘要 |
A method of determining the amount of air contained in a viscous building material, such as concrete or asphalt, is provided. A sample of the material is placed in a fluid-tight container and a vacuum is pulled. The air will expand causing the material to expand. The amount of expansion is measured, which expansion is a function of the amount of air in the material. Also, a technique is provided for determining the size of the voids caused by the air.
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