Essay Example on Sieve analysis is always used to determine the grain size Distribution









Introduction Sieve analysis is always used to determine the grain size distribution of soils Mechanical Sieves Sieves is a device used for separating wanted elements from unwanted material or for defining the particle size distribution of a sample typically using a woven screen such as mesh or net or metal Please make note that there are different sizes of sieves The sample dry soil is placed in the top of the sieve stack and carefully covers it with lid Shake the stack of sieves for about 5 minutes After shaking weigh the sample retained on each sieves including the weight retained in the pan Standards ASTM Standard C136 C136M Unified standard Purpose The fundamental objective is to determine how many types or size of soil The Standard grain size analysis test determines the relative proportions of different grain sizes as they are distributed among certain size ranges

Apparatus Required Methodology Procedure Stack of Sieves including pan and cover Sieve Gloves Lab coat Balance with accuracy to 0 01 g Rubber pestle and Mortar for crushing the soil if lumped or conglomerated Mechanical sieve shaker Oven Specimen Air dry soil sample stack of sieves NB The balance to be used should be sensitive to the extent of 0 1 of total weight of sample taken Methodology Procedure 1 Dry soil sample break the sample Mortar Pestle 2 Weight of container 3 Record the mass of the total soil sample as M 4 If soil particles are lumped or conglomerated crush the lumped and not the particles using the pestle and mortar 5 Sieve no4 10 20 40 60 100 200 6 Determine the mass of sample accurately as M g 7 Record each and every weight of the sieve M4 M10 M20 M40 M60 M100 M200 8 Stack the sieves with the smallest sieve number on top and place the pan at the bottom of the sieve pack 9 Place the specimen on the top of the upper sieve in the set of sieves soil sample 1100g 10 Place lid on the upper sieve 11 Put the sieve on top of the sieve shaker 12 13 Determine the weight of the sieves 14 Placed the weighted soil in the top of sieve stack and cover with the lid Shake for 5 minutes in order the sample pass in each sieves

15 Weigh the sample retained in each of the sieves Safety Precaution When sieve analysis is running someone should tight the lock at the sieve analysis Results Grain size curve distribution curve Calculations Uniformity Coefficient Cu Coefficient of Curvature Cc Lab Report 2 Gravimetric moisture content determination using oven drying The soil moisture content may be expressed by weight as the ratio of the mass of water present to the dry to the dry weight of the soil sample or by volume as ratio of volume of water to the total volume of the soil sample To determine any of these ratios for a particular soil sample the water mass must be determined by drying the soil to constant weight and measuring the soil sample mass after and before drying The water mass or weight is the difference between the weights of the wet and oven dry samples The criterion for a dry soil sample is the soil sample that has been dried to constant weight in oven at temperature between 100 110 oC 105 oC is typical It seems that this temperature range has been based on water boiling temperature and does not consider the soil physical and chemical characteristics ASTM standard C136 136M unified standard Materials Oven with 100 110 0C temperature Aluminum weigh tins A balance of precision of 0 001 g auger or tool to collect soil samples Procedure 1 

Weigh the aluminium tin and record this weight 2 Put the sample a soil sample of about 10g in the tin and record this weight as wet soil 3 Place samples in the oven 105oC and dry for 24 hours or overnight 4 Appropriately weigh the sample and record this weight as weight of dry soil 5 Place the sample back in the oven and dry for several hours and determine the weight of dry soil 6 Redo process 5 until there is no difference between any two consecutive measurements of the weight of dry soil Calculations for Gravimetric Water Content Results are usually reported as soil water on a dry mass basis When reporting the results you need to specify the conditions under which the determination has been undertaken Conclusion finally we can ascertain the type of soil at the place with use the Sieve Analysis Test and depend to the sample of soil through the sieve Depend to size of sieve mm and percentage passing we can plot the sieve analysis graph to know the type of soil Besides that we were able to determine the Uniformity Coefficient Cu and Coefficient of Curvature Cc we also can know well graded uniformly graded and well graded

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