Bridge Abutment Soil Compaction Test - MCEER
Bridge Abutment Soil Compaction Test - MCEER
Bridge Abutment Soil Compaction Test - MCEER
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<strong>Bridge</strong> <strong>Abutment</strong> <strong>Soil</strong><br />
<strong>Compaction</strong> <strong>Test</strong><br />
ASHFORD KNEITEL<br />
ADVISOR: SCOTT ASHFORD<br />
UNIVERSITY OF CALIFORNIA, SAN DIEGO<br />
REU Symposium Kiawah Island Golf Resort - Kiawah, S.C. August 5-8, 2004<br />
Pacific Earthquake Engineering Research Center (PEER)
Outline<br />
WHAT IS SOIL COMPACTION?<br />
DISADVANTAGES<br />
COMPACTION RAMMER<br />
COMPACTION MOLDS<br />
GOALS<br />
METHOD<br />
COMPACTION TEST RESULTS<br />
COMPACTION CURVE<br />
WHAT DOES THIS MEAN?<br />
REU Symposium Kiawah Island Golf Resort - Kiawah, S.C. August 5-8, 2004<br />
Pacific Earthquake Engineering Research Center (PEER)
What Is <strong>Soil</strong><br />
<strong>Compaction</strong>?<br />
Change the following properties in a favorable direction:<br />
Strength<br />
Compressibility<br />
Volume stability (shrink-swell potential)<br />
Hydraulic conductivity<br />
Erodibility<br />
These properties generally become favorable as soil<br />
density increases.<br />
REU Symposium Kiawah Island Golf Resort - Kiawah, S.C. August 5-8, 2004<br />
Pacific Earthquake Engineering Research Center (PEER)
Disadvantages<br />
“Overcompaction” can result in:<br />
Increased swelling in clay soils.<br />
Decreased strength in clay soils.<br />
REU Symposium Kiawah Island Golf Resort - Kiawah, S.C. August 5-8, 2004<br />
Pacific Earthquake Engineering Research Center (PEER)
Goals<br />
To determine the relationship between water content and dry unit<br />
weight of a soil from San Diego’s Camp Elliot army base.<br />
The soil will be used to provide foundation for bridge abutments.<br />
REU Symposium Kiawah Island Golf Resort - Kiawah, S.C. August 5-8, 2004<br />
Pacific Earthquake Engineering Research Center (PEER)
Method<br />
The soil is placed in 5 layers into a 6 in. diameter mold.<br />
Each layer is compacted by 56 blows of a 10 lbf rammer dropped<br />
from a distance of 18 in., giving the soil a compactive effort of about<br />
56000 ft-lbf/ft 3.<br />
REU Symposium Kiawah Island Golf Resort - Kiawah, S.C. August 5-8, 2004<br />
Pacific Earthquake Engineering Research Center (PEER)
<strong>Compaction</strong> <strong>Test</strong> Results<br />
Run Number Units <strong>Test</strong> #1 <strong>Test</strong> #2 <strong>Test</strong> #3 <strong>Test</strong> #4 <strong>Test</strong> #5<br />
Wet Unit Weight Kn/m 3 20.38 21.76 20.78<br />
21.46 20.87<br />
Tare Number Pt 1,1 Pt 2,2 Pt 3,3 Pt 4,4 Pt 5,5<br />
Water Content % 6.56 9.76 12.08 11.34 8.67<br />
8.57 10.65 12.43 10.31 8.59<br />
Ave. Water Content % 7.57 10.21 12.26 10.83 8.63<br />
Dry Unit Weight Kn/m 3 18.95 19.74 18.51 19.36 19.21<br />
REU Symposium Kiawah Island Golf Resort - Kiawah, S.C. August 5-8, 2004<br />
Pacific Earthquake Engineering Research Center (PEER)
<strong>Compaction</strong> Curve<br />
Dry Unit Weight Kn/m 3<br />
20<br />
19<br />
18<br />
17<br />
6 7 8 9 10 11 12 13<br />
Average Water Content %<br />
REU Symposium Kiawah Island Golf Resort - Kiawah, S.C. August 5-8, 2004<br />
Pacific Earthquake Engineering Research Center (PEER)
What Does This Mean?<br />
95% range of soil’s water content for optimum density.<br />
The soil at Camp Elliot will work best with a water content<br />
of anywhere between 7.57 – 11.5%.<br />
REU Symposium Kiawah Island Golf Resort - Kiawah, S.C. August 5-8, 2004<br />
Pacific Earthquake Engineering Research Center (PEER)
<strong>Compaction</strong> Rammer<br />
REU Symposium Kiawah Island Golf Resort - Kiawah, S.C. August 5-8, 2004<br />
Pacific Earthquake Engineering Research Center (PEER)
<strong>Compaction</strong> Molds<br />
REU Symposium Kiawah Island Golf Resort - Kiawah, S.C. August 5-8, 2004<br />
Pacific Earthquake Engineering Research Center (PEER)
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