Dry density in TDR use and examination of the ASTM D6780 Standard

What is it about?

This paper reports on a series of tests that were performed using a novel TDR calibration technique. In this approach, the TDR response could be calibrated in a soil specimen of constant gravimetric water content (ω), while carefully controlling the total volume of the specimen, by monotonically compressing a known, constant mass of moist soil. Under these conditions, dozens of data points may be collected for compilation into a calibration curve from a single specimen. This methodology was adopted for three different soils: clay, silt, and loam. For each soil, three different gravimetric water contents were examined.

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Photo by Aya Okawa on Unsplash

Photo by Aya Okawa on Unsplash

Why is it important?

The study is important for TDR users in order to make more correct use of this tool