concretes for pavements and bridge decks: a primer · 2021. 6. 29. · mehta and monteiro 2005...
TRANSCRIPT
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Concretes for pavements and bridge decks: A Primer
Narayanan Neithalath Associate Professor
School of Sustainable Engineering and the Built Environment Arizona State University, Tempe AZ
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Structural Concretes
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
What is CONCRETE ?
• From the Latin word “Concretus”
• Means : To hold together or grow together
• It is a “Formable Rock”
• A composite material – Binder(s) + Filler (s)
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Scale of concrete use
• Present consumption of concrete of the order of 12 billion tons every year
• Humans consume no material except water in such tremendous quantities
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Raw material usage in concrete
• Normal concrete: 12-15 percent cement, 8-10 percent mixing water, 70-80 percent aggregate by mass. – 1.5-2 billion tonnes of
cement, 9-12 billion tonnes of sand and rock together with one billion tonne of mixing water
• 12 billion tonne concrete industry is the largest user of natural resources
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Size scales in concrete
Macroscale Mesoscale Microscale
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Bridges – Large concrete consumers
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Concrete Pavements
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Early Concrete Uses
• 1 mile long Michigan rural concrete road - 1909
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Roman Use of Concrete
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Precast, Prestressed Concrete
Mehta and Monteiro 2005
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Proportions - Range
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Particle Packing
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Significance of the material on performance?
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Slump Testing
12 in
8 in
4 in
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Slump Testing
Measured to the nearest ¼ in (5 mm)
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Uses of slump test
• Check on the day to day or hour to hour variation in materials
• Increased slump may indicate increased moisture states of aggregates
• Changes in slump indicate changes in aggregate gradation
• Indicates the relative amount of coarse to fine aggregates
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Factors affecting slump-paste content
Low paste content
Harsh mix
High paste content
Rich mix
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Ball bearing effect-start
starting height
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Ball bearing effect-end
slump
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Fly ash benefit
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Aggregate size / surface area
volume = 1 cubic in
surface area = 6 square inches volume = 1 cubic in
surface area = 1.5*8= 12 square inches
block surface area = 0.5*0.5*6=1.5
block surface area = 1*1*6= 6
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Admixtures
• set retarding admixtures
• set accelerating admixtures
• water reducing admixtures
• superplasticizers
• air entraining admixtures
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Unit Weight and Yield (ASTM C 138)
• Unit weight or fresh density
• Yield – volumetric quantity of concrete produced per batch
• Proper consolidation needed before determining yield and density
• Expressed in kg/m3 or lb/ft3
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Air Content
• To ensure sufficient freezing and thawing resistance
• Pressure Method – ASTM C 231
• Volume method – ASTM C 173
• Gravimetric Method – ASTM C 173
• Air Indicator Method – AASHTO T 199
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Pressure Method (ASTM C 231)
• Based on Boyle’s law
• Relates pressure to volume
• Calibrated to read air contents directly
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Volumetric Method (ASTM C 173)
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Heat evolution curve
Time (h)
Rate
of heat
evolu
tion (
cal/g.h
) 6
2
4
0.1 1 10 100
Stage 2 Stage 3 Stage 4 Stage 5
Stage 1 – Initial dissolution
Denotes
Initial set
Denotes
final set
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Temperature
fresh concrete
aggregates paste
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Bleeding
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Interaction between bleeding and evaporation
surface water
Evaporation
Bleed water
Bleed water = evaporation
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Too much evaporation
no surface water
Evaporation
Bleed water < Evaporation
drying
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Free Shrinkage
before shrinkage After Shrinkage
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Restrained Shrinkage
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Curing of Concrete
• Three most important aspects in curing
• TIME
– Cure for as long as it is required
• TEMPERATURE
– Cure at the right temperature for strength gain
• MOISTURE
– Enough (or more) moisture
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Importance of Curing
• Stronger concrete
• Impermeable concrete
• More resistant to stress, abrasion
• Resistance to freezing and thawing
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Method-I – maintaining the presence of water
Water supplied from external source
Evaporation from water surface
Concrete
Saturated
Water supplied from external source
Evaporation from water surface
Concrete
Saturated
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Method-II – Reduce loss of mixing water from the surface
Membrane curing compounds
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Hydration product - C-S-H
Diamond 2001
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Hydration product - C-H
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Hydration product - C-A-S-H
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Paste Microstructure
What is revealing in these pictures?
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
High Strength (Performance) Concrete Buildings
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Interplay of strength determinants
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Reducing the friction results in a more uniform state of stress
Steel
Steel
cutting Steel brush Teflon sheets
High friction low friction
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Size Effect
Strength
6”
85%
36”
100%
Test results
structures
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Loading Rate
e Elastic
Stress
Strain Softening Static
Dynamic
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Flexural test
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Flexural Test
0.00 0.10 0.20 0.30 0.40Deflection, mm
250
750
1250
1750
2250
0
500
1000
1500
2000
2500
Lo
ad, N
Control
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Aesthetically unpleasing
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Why is Shrinkage important ?
• Transverse cracking observed in 100,000 + bridges in the US
• Early age cracking an important issue for state DoTs
• Cracks enhance the risk for further durability problems like corrosion, sulfate attack etc.
• Increased maintenance costs, reduced life
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Influence of SRAs
0.0 0.2 0.4 0.6 0.8 1.0
0
400
800
1200
Bu
lk s
hri
nkag
e s
train
(e)
0% SRA
1% SRA
2.5% SRA
7.5% SRA
Neithalath et al. 2005
= f (time, Diffusion coefficient)
tDm2
0 5 10 15 20 25 30
Age (days)
0
1
2
3
4
5
Resid
ual
str
ess (
MP
a)
0% SRA
1% SRA
7.5% SRA
Tensile Strength
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Concerns with Durability
Bridge deck
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Concerns with Structural integrity
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Freezing and thawing damage
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
F-T exposure
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Concrete subjected to F-T
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Frost / F-T Action in Concrete
C2
C1
As water freezes,
It expands by 9% -
Hydraulic Pressure
Hydraulic Pressure
Osmotic Pressure
Stresses
Cracking and Spalling
Volume of Ice > Volume of water
C2 > C1
Pore water in concrete
is Ionic
Osmotic Pressure
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Air void size and distribution
• Hardened concrete analysis – polished section
• Air void content in the hardened state may be different from that in the fresh state – field changes
• Air void size, spacing also important to achieve good F-T resistance
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
ASTM C 457 – Point Count or Linear Traverse
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Scaling of Concrete
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Alkali-Silica Reaction (ASR)
Mehta and Monteiro 2005
Thomas E. Stanton
Damages in California Highway system
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Alkali-Silica Reaction (ASR) • Visual Symptoms
– Network of cracks
– Closed or spalled joints
– Relative displacements
– Fragments breaking out of the surface (pop-outs)
Mechanism
1. Alkali hydroxide + reactive
silica gel reaction
product (alkali-silica gel)
2. Gel reaction product +
moisture expansion
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
ASR Gel
PCA
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Reaction products
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Backscattered SEM image
Mehta and Monteiro 2005
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Reinforcing Steel Corrosion 101
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Factors needed for corrosion
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Effects of Corrosion
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Corrosion of Steel
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Delamination due to corrosion
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Pop outs and Corrosion spalling
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Chloride Penetration into Concrete
• Slices 2” thick from cores used for RCPT
• ASTM C 1202
• Allowing chloride ions to pass through concrete under a concentration gradient
• Measuring the chloride ion passage in terms of electrical charge passed (Coulombs)
Rapid Chloride Permeability Test
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Chloride Penetration into Concrete
• Ponding the surface of concrete with solution rich in chlorides
• Represented as lbs/cy absorbed after a certain amount of time
Chloride Ponding Test
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Tips for good bridge and pavement concretes
• Workability
– Aggregate gradation
– Cement replacement materials
– Admixtures
• Hydration
– Right amount of cement (cracking because of heat)
– Cement replacement materials / secondary reaction
– Fillers
– Temperature
– Curing
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N.Neithalath; Presented at the AZ Pavement Conference, ASU, November 2013
Tips for good bridge and pavement concretes
• Strength – Cement content, packing of particles, water content
– Curing
– Cement replacement materials/fillers
• Volume changes (Shrinkage) – Cement and water contents
– Paste properties
– Admixtures
• Durability
– Cement and water contents
– Replacement materials