PE-04-Soil-Improvement

PE-04-Soil-Improvement - 04- Soil Improvement *01: Can a...

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04- Soil Improvement *01: Can a contractor attain 105% of Standard Proctor? *02: Find the optimum moisture content ( OMC ). *03: Find the maximum dry unit weight in SI units. *04: What is the saturation S at the OMC ? *05: Number of truck loads required. *06: What is the saturation S at the OMC ? *07: Definition of the relative compaction ( RC ). *08: The relative compaction ( RC ) of a soil. *09: Converting volumes from borrow pits and truck loads. **10: Ranges of water and fill required for a road. **11: Soil improvement techniques. **12: Find the family of saturation curves for compaction. **13: Water needed to reach maximum dry unit weight in the field. **14: Multiple choice for fill volumes and truck load requirements for a levee . **15: Multiple choice compaction of a levee. Symbols for Soil Improvement. e Voids ratio. G S Specific gravity of the solids of a soil. n Porosity of the soil. OMC Optimum moisture content. S Degree of saturation. V ( 3 1 9.44*10 30 ft m 4 3 Standard Proctor mold, ASTM D-698). V a Volume of air. V S Volume of solids. V V Volume of voids (water + air). V W Volume of water. w Water content. V S Volume of soil sample. γ Unit weight of the soil. γ d Dry unit weight. γ b Buoyant unit weight of the soil. γ SAT Saturated unit weight of the soil. γ S Unit weight of the solid. γ W Unit weight of water. γ d.field Dry unit weight in the field. 90
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*Compaction–01: Can a contractor attain 105% of Standard Proctor? (Revision: Aug-09) A contractor has reported several compaction tests that have exceeded the 98% Standard Proctor required by the Specifications of a paving project. In fact, several of the field tests reported Relative Compactions of 105% of Standard Proctor. Is this possible? Solution: Definitely yes! Remember that the Proctor test series (Standard and Modified) prescribes a specific amount of energy into a standard mold (1/30 th of 1 ft 3 ). Therefore, the contractor could impart more energy into the field compaction than was performed in the laboratory to attain the 100% of Standard (or Modified) Proctor. Standard Proctor follows the procedure of ASTM D-698 or AASHTO T-99. Modified Proctor follows the procedure of ASTM D-1557 or AASHTO T-180. 91
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*Compaction–02: Find the optimum moisture content (OMC). (Revision: Aug.-09) A Standard Proctor test has yielded the values shown below. Determine: a) The maximum dry unit weight γ d and its OMC; remember V = 1/30 ft 3 . b) The moisture range for 93% of maximum dry unit weight. No Weight of wet soil (lb) Moisture % 1 3.26 8.24 2 4.15 10.20 3 4.67 12.30 4 4.02 14.60 5 3.36 16.80 Solution: The formulas used are: and 1 == + d W Vw γ W (lb) w (%) γ ( lb / ft 3 ) d ( lb ft 3 3.26 8.24 97.8 90.35 4.15 10.20 124.5 113.0 4.67 12.30 140.1 124.8 4.02 14.60 120.6 105.2 3.36 16.80 100.8 86.30 92
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*Compaction–03: Find the maximum dry unit weight in SI units. (Revision: Aug.-09) Using the table shown below: a) Estimate the maximum dry weight of a sample of road base material, tested under Standard Proctor ASTM D-698 (all weights shown are in Newton).
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This note was uploaded on 09/11/2011 for the course CEG 4011 taught by Professor Staff during the Summer '10 term at FIU.

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PE-04-Soil-Improvement - 04- Soil Improvement *01: Can a...

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