Standard protcor compaction test full Lab Report

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ntroduction ............................................................................................................................ 3 Sample Calculations ........................................... ....................................................................... 5 Results .................................................................................................................................... 6 Discussion ............................................................................................................................. 8 Conclusion ............................................................................................................................ 9 References ............................................................................................................................ 10 Appendix ............................................................................................................................. 11 (Attached Sheet) Introduction The standard proctor compacting test is used to determine the soil compaction properties, as well as to determine the optimal moisture content at which soil can reach its maximum dry density, therefore; it is necessary to compact soil to improve its strength. The degree of compaction is measured by its dry unit weight gd. Soil has a lot of different particles with different shapes; so when compacting dry soil there is a lot of friction with the soil particles against each other, therefore; it is difficult for them to maneuver into the soil voids. When water is introduced to the soil it almost acts like a lubricant and reduces the friction on the soil particles against each other. Through this process, the particles have an easier time sliding into the soil voids when compacted. Although water makes compaction easier, too much water can also be bad for compaction. Through the standard proctor test the goal is to find the optimum moisture content of the soil, wopt. This point is where water changes from helping compaction to hurting it. When there is too much water added to the soil it starts becoming too saturated and the water fills in the soil voids. With the voids filled up there is nowhere for the soil particles to go. Instead of the soil condensing it just moves thus not compacting. Sample Calculations (From trial 1) Weight of moist soil W2 – W1 = 13.01 lb – 9.26 lb = 3.75 lb Moist unit weight (W 2– W 1) (1/30) = (13.01– 9.26) (1/30) = 112.5 lb/ft3 Moisture content w (%) (M 4 – M 5) (M 5 – M 3) x 100 = (53.4 –52.37) (52.37 – 29.87) x 100 = 4.6 % Dry unit weight of compaction, gd = γ 1+(w()/100) = 112.5 1+(4.6/100) = 107.6 lb/ft3 Zero-air-void unit weight gzav = γ w ( w( ) 100 )+(1 /Gs ) = 62.4 4 100 + 1 2.812 = 157.73 lb/ft3 [Show More]

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