Abstract: The purpose ofthe lab report is to examine textural characteristics of sediment sample(unconsolidated),using grain size analysis methods, providing the grain size distribution,required in classifying the soil type. Sieve analysis is performed to determinedistribution of particles, ranging anywhere from coarse to fine.
Equipment used: Set of sieves,Cleaning brush, Sieve shaker, Scale, Sediment sample, 7 dishes, mortar andpestle Procedure: (1) Inspectedsample visually (2) Weighed 1kgof sample using scale (3) Used mortarand pestle to rid any clumps (4) Checked sievestack was in order of sieves (increases downward, grain size decreased) (5) Placed sievestake onto Ro-Tap shaker (6) Sieve wasput on top sieve and lid was placed on top of sieve (7) Shaker wasturned on for 5 minutes (8) Transferred sedimentinto labelled containers per size (9) Measuredweight per grain size (plates were pre-weighed) (10) Put sampleback into sample bucket Data:Discussion: Sieveanalysis is a type of mechanical analysis that helps determine the size ofparticles present in a sample of soil. Particle size analysis was used todetermine the relative proportions of various grain sizes in the sediment sampleused, by shaking sediment sample into set of sieves that passed throughprogressively to the bottom sieve. The graph beingbell-curved helps identify the grading of soil and percentage of coarse andfine materials. Since soil particles passed through top to bottom sieve thesediment sample is thus containing mostly of sand. Duringthe sieve analysis, masses remained on each sieve were measured on weighingmachine, and from that the percentage retained was measured.
Potential sources of error are presumed in the grain size analysis dueto human errors made. Additional sources of errors may have occurred due to obtainingsediment sample in limited statistic accuracy, orientation of sediment duringshaking not being suitable, possible presence of soil lumps, and/or errors madein reading the weighing scale resulting in less precision and accuracy. Coarse grainedsoil mainly being sand, being poorly graded also known as uniformly graded, canwork best for construction purposes, due to the arrangement of soil particlesthat reduce voids and enhance compatibility. Formed where?Conclusion:In conclusion, grain size distribution was achievedby the help of sieve analysis, for soil used. The sediment sample used duringthe lab is uniformly distributed and can be useful for construction purposes.
Knowingpotential human errors may have occurred during the experiment.