HW 4 Compaction Assignment updated-1

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University of North Florida *

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BCN-3223

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Mechanical Engineering

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Dec 6, 2023

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pdf

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2

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BCN 3223C Soils and Founda�ons Homework: Soil Compac�on Background: Your job is to prepare 1000 LF of soil compac�on for the county road subgrade. The borrow pit soil is primarily sand and gravel mix and meets the requirements on the drawing and specifica�ons. Prior to the soil compac�on, you conducted a Proctor Test from the borrow Pit and scheduled compac�on ac�vity today. Required Tasks: 1. The Proctor test results are shown in the data table, and you need to complete the graph and find OMC and Maximum dry Weight (density). 2. The specifica�ons allow ± 2% Moisture (water) content, and minimum rela�ve density is 95%. Please draw the acceptable zone on the graph. 3. Provide a soil compac�on method and proper equipment selec�on with sufficient explana�on. Submission: 1. Complete the data and graph sheet including OMC and Max dry Density. 2. Draw the acceptable zone on the graph. 3. Provide a separate page to answer #3 above in a paragraph. Rubric: # Descrip�on Max. Points 1. Data calcula�on and table comple�on 10 2. Graph, OMC, and Max. Dry Density 10 3. Acceptable zone drawing 10 4. Method and Equipment Analysis 10 Total 40
Test Method: Standard Proctor, Method A in accordance to ASTM 698 Test By: Visual Description: gray silty clay, trace fine sand, low plasticity, moist Density Determination Soil sample No. Unit 1 2 3 4 5 6 Water Content (get from below table) percent Mass of compacted soil and mold grams 3457.2 3721.2 3909 3782.5 3715.2 3502 Mass of mold grams 1933 1930 1975 1900 1790 1920 Wet mass of soil in mold grams 1520 1788 2176 2149 2082 1620 Mold Volume cm3 944 944 944 944 944 944 Wet Unit Weight pcf Dry Unit weight pcf Water Content Determination Soil sample No. Unit 1 2 3 4 5 6 Mass of empty, clean can + lid grams 6.5 6.4 6.2 6.5 6.4 6.3 Mass of can, lid, and moist soil grams 12.11 13.32 11.98 12.5 11.88 10.99 Mass of can, lid, and dry soil grams 11.63 12.6 11.08 11.4 10.68 9.74 Mass of soil solids grams Mass of pore water grams water content percent gram = 0.0022 lbs, 1 cm3 = 0.000035 cf 1. Find OMC from the graph 2. Find maximum dry density at OMC from the graph Moisture Density (Compaction) Test Data Sheets 5.13 0.48 9.36% 6.2 0.72 0.9 1.1 1.2 1.25 11.61% 18.44% 22.45% 28.04% 36.34% 4.88 4.9 4.28 1.44 92.55 106.67 122.33 116.86 108.27 79.12 107.87 138.63 143.09 144.89 9.36% 11.61% 18.44% 22.45% 28.04% 36.34% 101.21 119.06 1.Soil compaction method would be vibration 2.Proper equiptment is a drum
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