How to measure the Saturated and residual water content??

Well,

A 75 cm3 sediment sample was taken to the laboratory. It was weighed in its normal state with its water content (158.88 gm), saturated with water and re-weighed to 164.34 gm. ) And finally dried with an oven and the weight of the sample was dry (89gm142). Suppose the water density is 1 g / cm3 and the density of the sample granules equals 2.65 g / cm 3, then find the following:

1. Ratio of water content to volume? Volumetric water content

2- Percentage of alkaline water content? Gravimetric water content

3. Saturation ratio? Saturation ratio

4-Porosity

5 - Production or qualitative tender? Specific yield

6. Qualitative Detention? Specific Retention

7-Dry bulk density Dry density

Preparation and Assumptions:

- Total size ............ 75 cm 3

- Weight of water ........... = Weight of natural sample - dry weight. = 15.99 gm (.89gm142 - 158.88 gm)

- Water Volume in Sample = Water Weight / Density = 15.99 g / 1 g / cm 3 = 15.99 cm 3

- Volume of blanks = Water weight after saturation / water density = (164.34 - 8,9142) g / 1 g / cm 3 = 21.45 cm 3

- Bulk density = Sample weight / total size = 8,9142 g / 75 cm 3 = 1.91 g / cm 3

- The density of the sample granules equals (2.65) g / cm 3

- Volume of water discharged from the sample = Weight of water discharged from the sample / density = (147.3-164.34) g / 1 g / cm 3 17.04 cm 3.

- Water volume remaining after drainage = (sample weight after drainage - dry sample weight) / density

= (142.89 - 147.3) g / 1 g / cm 3 = 4.41 cm 3.

The solution :

1 - Percentage of water content of the volume = water volume / total sample size = 15.99 cm 3/75 cm 3 = 21%.

2 - Percentage of alkaline water content = water weight / dry weight = 15.99 gm / 8,9142 g = 11%.

3. Saturation ratio = water volume / volume of blanks = 15.99 cm 3 / 21.45 cm 3 = 75%.

4 - porosity = volume of blanks / total sample size = 21.45 cm 3/75 cm 3 = 29%.

5. Qualitative Production = Volume of water discharged from the sample / total size = 17.04 cm 3/75 cm 3 = 22.72%.

6. Qualitative detention = Remaining water volume after drainage / total volume = 4.41 cm 3/75 cm 3 = 5.88%.

Dry density = dry weight / total volume = 142.89 g / 75 cm 3 = 1.9 g / cm 3

Regards

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