Figure 12-6. Pore pressure gauge 



Experiment Procedures 



Sediment density measurements 



Sequence of events. Determination of relative density requires 

 determination of in-place density and minimum and maximum densities. 

 Minim-urn and maximum densities were determined at the Soil Mechanics 

 Laboratory for three dry samples taken randomly. In-place densities were 

 measured when the channel was drained on 8, 21, 22, 23, and 26 August 

 1991. 



Calibration and zero reference. Calibration for this test was repetition of 

 the test five times with a variation of less than approximately 1 percent of the 

 sample weight. 



Sampling and time reference. Table 12-1 summarizes samples taken to 

 determine relative density. 



242 



Chapter 12 Pore Pressure and Sediment Density Measurements 



