Chapter 5
— David Wagner 2007/06/29 15:40
Problem 1.
Vibratory compactors are most suitable for clean sand.
Problem 2.
Productivity:
458
| 458 CCY/hr |
|---|
Problem 3.
- Mechanical: Vibration
- Hydraulic: Surcharging
- Reinforcement: Soil Nailing
- Physiochemcial: Adding Lime, Cement, Fly Ash, Asphalt
Problem 4.
a. A compaction wheel is a small compactor similar to tamping or foot rollers normally mounted on the boom of a backhoe or hydraulic excavator.
b. The typical lift thickness for an excavator-mounted compaction wheel ranges fro 24 to 48 in. for excavators to 18 to 30 in. for backhoes.
c. The minimum pipe cover to use with an excavator-mounted compaction wheel is three ft for excavators and 2 ft for backhoes.
Problem 5.
- Rammer/tamper
- Vibratory plate
- Vibratory roller
- Compaction wheel
- Vibratory compactor
Problem 6.
Well, I suppose the water content is much higher than optimum. Draining the cut would be a step in the right direction, and letting this silty sand sit a bit in the fill to let excess water drain off before attempting to compact it is probably a good idea as well.
Problem 7.
19.8 hr,
Peak at 14.5%
| 19.8 hr |
|---|
Problem 8.
The field optimum moisture content may vary from laboratory measurements because the compactive effort delivered by a piece of compaction equipment is seldom exactly the same as that used in laboratory tests.
Problem 9.
| Chapter 5 Problem 9 | |
|---|---|
| MC | DENISTY |
| 10 | 109 |
| 12 | 112 |
| 14 | 116 |
| 16 | 115 |
| 18 | 110 |
| 20 | 106 |
| Labority Optimum: 14.5% Moisture Content |
|---|
0.9*117=105.3
| 90% Modified AASHTO Density: 105 lb/cf |
|---|

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