subgrade stability and lime treatment applications at omp marshall thompson, p.e. professor emeritus...
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SUBGRADE STABILITY and
LIME TREATMENT APPLICATIONS at OMP
Marshall Thompson, P.E.Professor Emeritus – CEUniversity of IL @ U-C
0
5
10
15
20
25
0 1 2 3 4 5 6 7 8 9
Subgrade CBR
Req
uir
ed T
hic
kn
ess
Ab
ove
Su
bgr
ade
(in
ches
)
Remedialproceduresoptional
Remedial Procedures Required Remedialproceduresnot needed
IMPROVED MATERIAL COVER REQUIREMENTS
Automated Dynamic Cone Penetrometer (ADCP)
University of Illinois ADCPUniversity of Illinois ADCP with with
its data acquisition systemits data acquisition system
MOISTURE – DENSITY CONTROLDIFFICULTIES
•DRYING EFFORTS = ???
•DRYING DAY = ???(TEMP / ET)
• # DRYING DAYS ??
LKD COMPOSITIONSome Kilns (15-20%)
QL + “INERT MATERIAL”
INERT MATERIAL (50-70%)+ SiO2 + Al2O3
+ Calcite / Dolomite
CATION EXCHANGE FLOCCULATION & AGGLOMERATION
RAPID REACTION !!!!!
ALL FINE-GRAINED SOILS WITH SIGNIFICANT CLAY!!
OMP SOIL SAMPLES
* 61 BUCKETS
* % CLAY RANKING(CHECK PI / CARBONATES)
* VISUAL INSPECTION
* SELECTED BUCKETS (FOUR GROUPS)
Grouping Of Soils
BoringNo.
BucketNo. Depth Soil Description
Clay% LL PI
Silt %
GROUP 1MT 14 20 5'-10' Gray SILTY CLAY with Sand 17.6 22 6 54.8
MT 16 17 1'-5' Brown and Gray SANDY LEAN CLAY 19.2 30 17 35.4
MT 4 43 1'-4' Gray LEAN CLAY with sand 22.1 24 8 52.4
MT 3 54 29'-33' Gray SANDY LEAN CLAY 22.1 30 11 39.7
GROUP 2MT 3 52 6'-10' Gray SANDY LEAN CLAY 22.8 25 8 44.5
MT 3 51 2'-6' Gray LEAN CLAY with sand 23.5 27 12 49.9
MT 4 44 8'-12' Gray SANDY LEAN CLAY 23.7 24 8 42.9
MT 5 50 33'-36' Gray SANDY LEAN CLAY 25.3 28 10 41.6
Boring No.
Bucket No. Depth Soil Description
Clay % LL PI
Silt %
GROUP 3
MT 5 47 1'-5' Gray LEAN CLAY with sand 29 33 13 43.2
MT 15 32 1'-5' Gray LEAN CLAY with Sand 29.2 24 9 41.4
MT 10 36 1'-5' Gray LEAN CLAY with Sand 29.4 24 11 39.3
MT 13 3 16'-20' Gray LEAN CLAY with sand 29.7 32 17 50
GROUP 4
MT 17 24 18'-21' Brown and Gray LEAN CLAY with Sand 39.4 41 24 39.7
MT 8 16 30'-34' Brown and Gray LEAN CLAY with Sand 39.7 38 19 43.3
MT 12 12 30'-35' Brown and Gray LEAN CLAY with Sand 41.9 46 26 42.6
MT 6 27 6'-10' Brown and Gray LEAN CLAY with Sand 43.7 44 18 38
LIME LAB TESTING PROGRAM
•M-D-CBR (0 & 5% LIME)• QU (0 & 5% LIME) (48-HOURS @ 12O°F)•RESILIENT MODULUS (0 & 5% LIME)•LIME TYPE EFFECT•% LIME EFFECT
Moisture-Density Results for Group 2 Soils
95
100
105
110
115
120
125
10 13 16 19 22 25
Moisture Content %
Dry
Den
sity
(p
cf)
0% Lime
5% Lime
OMC =14.1%
OMC=16%
CBR Results for Group 2 Soils
0
10
20
30
40
50
60
10 12 14 16 18 20 22 24
Moisture Content %
CB
R 0% Lime
5% Lime
OMC = 16%
OMC = 14.1%