Part-III-Compaction-F05 - PART III SOIL COMPACTION...

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1 Prof. M. Santagata CE 383 SOIL COMPACTION SLIDE 1 PART III SOIL COMPACTION ± INTRODUCTION ± METHODS FIELD & LAB ± THEORY OF COMPACTION ± EFFECT OF SOIL TYPE ± STRUCTURE OF COMPACTED SOILS ± COMPACTION SPECIFICATION ² FINISH END-PRODUCT SPECIFICATIONS ² METHOD SPECIFICATIONS ² EXAMPLE ± INTRO TO COMPACTION CONTROL (more in LAB) Prof. M. Santagata CE 383 SOIL COMPACTION SLIDE 2 ² USED TO: improve engineering properties of soil (Reduce settlements, increase strength, improve bearing capacity of pavement subgrades, decrease permeability of liners) ² Fundamental when soil is used as an engineering material (e.g. earth dams, highway embankments, landfill liners) ± INTRODUCTION SOIL COMPACTION INTRODUCTION COMPACTION = DENSIFICATION OF SOIL BY THE APPLICATION OF MECHANICAL ENERGY MAY INVOLVE MODIFICATION OF WATER CONTENT
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2 Prof. M. Santagata CE 383 SOIL COMPACTION SLIDE 3 East Side Reservoir Project, Riverside County, CA Kettleman Hills Landfill, CA Prof. M. Santagata CE 383 SOIL COMPACTION SLIDE 4 METHODS ± METHODS - FIELD MECHANISMS •STAT IC • IMPACT • KNEADING • VIBRATION EQUIPMENT TABLE 5.2 - DAS • SMOOTH-WHEEL ROLLERS • RUBBER-TIRED ROLLERS • SHEEPSFOOT ROLLERS • VIBRATORY ROLLERS
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3 Prof. M. Santagata CE 383 SOIL COMPACTION SLIDE 5 ± METHODS - LAB METHODS Different types available: DYNAMIC, KNEADING, COMPACTION All designed to DUPLICATE some type of field compaction Purpose: determine in the laboratory a reference for field compaction ² PROCTOR TEST Equipment • standard mold • three layers • standard hammer • fixed height • 25 blows V W = γ w d + = 1 W W w s w = • Calculate total unit weight • Measure water content • Derive dry unit weight Results Procedure • Mix soil with water • Place 1 st layer in mold • Compact • Repeat for other 2 layers Will do in Lab Prof. M. Santagata CE 383 SOIL COMPACTION SLIDE 6 ² COMMENTS • Standard and modified Proctor developed as a standard of comparison for field compaction……. …. approximation is not exact • Other tests available (e.g. Harvard miniature test) ² STANDARD vs. MODIFIED PROCTOR STANDARD MODIFIED Mold Same Hammer Weight 5.5 lbs 10 lbs Drop Height 12” 18” # Lifts 3 5 #drops/lift 25 25 Compaction effort 4.5 times greater in the modified
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4 Prof. M. Santagata CE 383 SOIL COMPACTION SLIDE 7 ± THEORY OF COMPACTION THEORY ² dry density or dry unit weight ² water content ²
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This note was uploaded on 02/27/2011 for the course CE 383 taught by Professor Marika during the Spring '07 term at Purdue University-West Lafayette.

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Part-III-Compaction-F05 - PART III SOIL COMPACTION...

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