Sieve Analysis (lab testing)

 

SIEVE table (none are Modifiable):

Field Name

Lookup

Description

PointID

 

 

Depth

 

 

Wt_Total_Spec

 

 

Wt_Passing_Split_Sieve

 

 

Wt_Fines_Tested

 

 

Size_Split_Sieve

 

millimeters

Weighing_Method

Lookup!

lab sv weigh methods

 

Wt_Sieving_Tare_Coarse

 

 

Wt_Sieving_Tare_Fine

 

 

WC_Wt_Wet_Coarse

 

Water Content Determination: Weight Wet Soil + Tare, any consistent units

WC_Wt_Dry_Coarse

 

Water Content Determination: Weight Dry Soil + Tare, any consistent units

WC_Wt_Tare_Coarse

 

Water Content Determination: Weight Tare, any consistent units

Water_Content_Coarse

 

%; Will be calculated if the data exists.

WC_Wt_Wet_Fine

 

Water Content Determination: Weight Wet Soil + Tare, any consistent units

WC_Wt_Dry_Fine

 

Water Content Determination: Weight Dry Soil + Tare, any consistent units

WC_Wt_Tare_Fine

 

Water Content Determination: Weight Tare, any consistent units

Water_Content_Fine

 

%; Will be calculated if the data exists.

Coarse_Sieved_Wet

 

Only used with split specimens. Unsplit specimens, and the fine portion of split specimens, are always assumed to be sieved dry.

 

SV READINGS table (none are Modifiable or have an associated Lookup):

Field Name

Description

PointID

 

Depth

 

Reading

Sieve Size in millimeters

Soil_Tare

Soil plus Tare weight. Tare weight supplied in parent table.

Percent_Finer

 

Wt_Sieve_Tare

Tare weight for each sieve. (Optional - see note below)

 

If the final results will be input, nothing is required in the parent record, except Depth.

The minimum fields that need data entries in the Sieve table are:

The program supports splitting the test specimen. This is commonly done when the soil has a large gravel fraction. The specimen is split into coarse and fine fractions. The entire coarse fraction, and a portion of the fine fraction, are sieved.

The Weighing Methods are C for cumulative and I for incremental. Cumulative weighing sums the weights of all soil retained on each sieve and those coarser. Incremental weighing only records the weight retained on each sieve individually. This is the same for split and unsplit specimens.

With unsplit specimens, the Weight Passing the Split Sieve and the Fine Weight Tested are not used. The fields relating to "Coarse" are used and the "Fine" fields are ignored. If the specimen weight represented a wet condition, you must supply a "Coarse" water content. However, unsplit specimens are assumed to be sieved dry so the Coarse_Sieved_Wet field is ignored. Finally, supply the weight of the Coarse sieving tare. This can be 0.

With split specimens, the weight passing the split sieve, the fines weight tested, and the split sieve size in mm must be supplied. If the soil was weighed wet, the water contents for coarse and fine fractions must be supplied. If the coarse fraction was sieved wet, input True in the Coarse_Sieved_Wet field. The fine fraction is assumed to be sieved dry. Finally, supply the weight of the Coarse and Fine sieving tares. They can be 0.

You can setup a Readings List and use it to populate the SV Readings table.

Notes:

The sieve analysis tables assume that there is only one or two tare weights used for weighing the soil retained on each sieve:

This works for labs where the procedure is to place the material in each sieve into a tare for weighing. You then either enter the tare weight into the Wt Sieving Tare Coarse field or you "zero out" the tare weight when you weight each sieve size.

Some labs will place the entire sieve with the material retained onto the scale. In this case the tare for each sieve will be different and the tare weights in the parent grid do not apply.

If you add a field called "Wt_Sieve_Tare" in the SV READINGS table (must be a numeric field; you can caption anyway you wish), you can input tare weights for each individual sieve in the test. If this field exists and all the data rows (a data row has entries for sieve size and weight of soil plus tare) have values in this field, the program will ignore the sieving tare values in the parent grid and use these values. If some of these fields have values in the data rows but not all, you will receive an error message to fill in this field for all the data rows or leave them all blank and use the sieving tares in the parent grid.