Laserfiche WebLink
PROCEDURES FOR SOIL SAMPLES <br /> DESCRIPTION AND IDENTIFICATION <br /> 1. Description and indentification of soil samples was conducted using ASTM <br /> Designation D 2456-64 •Standard Practice for Description and Idantificaiion of <br /> Soils(Visual-Manual Procedure). This procedure was strictly followed in oder to <br /> give as complete a description as possible, but it must be stressed that this is a <br /> visual-manual procedure <br /> MOISTURE CONTENT <br /> 2. To determine the moisture content of the sample as preserved, the sample is <br /> weighed this weight is recorded as 'w', and then dried to a constant weight using <br /> a heat source and weighed again, this weight recorded as 's'. The molslure <br /> content, W, is calculated m-w-s/s100(from ASTM D 2216-60). <br /> GRAVEL, SAND, AND FINE FRACTIONS <br /> 3. 200-400 grams of the died sample is sieved using a No. 4 sieve, the portion <br /> passed is weighed and recorded as sand and fines. The portion retained on the <br /> No. 4 sieve is weighed and recorded as gravel. To calculate the percentage of <br /> gravel the w6>jht of the gravel is divided by the weight of the original sample and <br /> multiplied by 100. The portion passing the No. 4 sieve is th(yn wet sieved using <br /> the No. 230 sieve and dried io a constant weight. The pgbanlage of sand is <br /> then calculated by dividing the portion retained on the No.'230 by the original <br /> sample and multiplying by 100. The percentage of fines-is calculated by <br /> ` J subtracting the total weight of gravel and sand subtracting that weight from the <br /> original sample weight, dividing by the original sample weight, and multiplying by <br /> 100. <br /> Sample calculation: <br /> 3ilOg sample: weight retained on No. 4 sieve, gravel: 2% <br /> weight retained on No. 230 sieve, sari. 125g <br /> { weight passing No. 230 sieve, gravel* sand- 300 = fines <br /> we~ght of fines: 150g } <br /> percentage gravel: 25/300"100= 8.3% <br /> percentage card 125/3000100= 41.79 <br /> percentage fine& 1501300'100- 50.09E <br /> SIEVE ANALYSIS: <br /> 4. Sieve analysis was performed as suggesled by ASTM Designation; D 422-6 <br /> "Standard Method for Particle-Size Analysis of Soils". WEGE method modified <br /> -` the ASTM standard by using the following sieves <br /> 21/2' No. 7 <br /> i 112' No. 35 <br /> 518•-- -- Na. $0 - <br /> 5/166 No.120 <br /> No. 4 No. 230 <br /> These sieves were chosen to closely follow the Wentworth scale for grain size <br /> classiHcallon <br />