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 – CE University of IL @ U-C

Transcript of SUBGRADE STABILITY and LIME TREATMENT APPLICATIONS at OMP Marshall Thompson, P.E. Professor Emeritus...

SUBGRADE STABILITY and

LIME TREATMENT APPLICATIONS at OMP

Marshall Thompson, P.E.Professor Emeritus – CEUniversity of IL @ U-C

SUBGRADE SOIL PROPERTIES

* STRENGTH (CBR/QU)* MODULUS

* RUTTING RESISTANCE

0.5 INCH / CBR -6

0.5-INCH RUT / CBR - 6

SOIL COMPACTION

MATERIAL COMPACTION

MATERIAL COMPACTION

MOISTURE – DENSITY - CBR

•UofIL / IDOT PROCEDURE

• COMPACT MOLD

• CBR ON “FINISHED” MOLD

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

CE CONE PENETROMETER

CBR = CI / 40

LOG (CBR) = 0.84 – 1.26 LOG (PR)PR – Penetration Ratio (inches/blow)

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 ??

MOISTURE CONTROL

IS

TEMPORARY SOLUTION!!!!!

“EQUILIBRIUM” CONDITIONS

LIME PRODUCTS

LIME PRODUCTION

(RAW MATERIALS)

CALCITE: CaCO3

DOLOMITE: Ca CO3 . MgCO3

QUICKLIME (QL) FINES

SOME QL PARTICLE SIZES ARE << SMALL FOR HYDRATION

PRODUCT = QL FINES

LIME KILN DUST (LKD)

FINELY-DIVIDED “DUST” FROM

THE KILN STACKS

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!!

NOT ALL FINE-GRAINED SOILS ARE

“LIME REACTIVE” !!!!

UNDESIRABLE !!!!!!

IMMEDIATE EFFECTS

A-6 (11)

FLANAGAN-B36% CLAY

PI –21

HOSMER-B30% CLAY

PI-22

CURING EFFECTS

CURING @ ~72°F

CHECK MT. CARMEL SAND & GRAVEL VIDEO

(CONSTRUCTION PROCESS)

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

LIME PRODUCTS

TYPE:

QUICKLIME FINES

LIME KILN DUST (LKD)

SOURCE:

BUFFINGTON, IN

SOUTH CHICAGO, IL

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%

BEST OPTION

LIME TREATMENT