development of an extremely durable concrete (edc) · 2020. 11. 17. · we will deliver a suite of...
TRANSCRIPT
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Development of an Extremely Durable Concrete (EDC)– A Novel Approach Coupling Chemistry and Autogenous Crack Width Control
Victor Li, University of Michigan
Team Members: Kimberly Kurtis Georgia Institute of TechnologyPaulo Monteiro University of California Berkeley
Enhancing concrete infrastructure service life by 5 foldTotal Project Cost: $1.9 MLength 24 mo.
Project Vision
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Enhancing durability by chemistry and crack control
Result: No repeated repairs, lowers energy consumption and O&M cost of infrastructure
Current infrastructure: Cracking is a key structural degradation mechanism; unreliable control
Future infrastructure: Crack control and self-heals
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The Team
PILi
Co-PIKurtis
Co-PIMonteiro
University of MichiganGeorgia
TechUC
Berkeley
Project Management with ARPA-E
AdvisorScrivener
Sub-groups Main focusMichigan Group Project coordination, composite development and extreme durability
investigation and verification
Georgia Tech Group Cement chemistry and particle packing
Berkeley Group Micro- and nano- characterization
EPFL
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We will deliver a suite of EDC products within 2 years
Goal: To achieve an EDC with life expectancy five times that of current concrete
Duration: 2 years (10/2019 – 09/2021)
Final Deliverables:
– Compressive strength: three levels > 20 MPa, 30 MPa and 40 MPa
– Tensile ductility > 3%
– Crack width < 50 μm
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The goal will be achieved by coupling chemistry and crack control
Durable Binder: Limestone Calcined Clay Cement (LC3)
Crack Width Control and High Ductility: Microfiber bridging (Engineered Cementitious
Composites, ECC)
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ECC controls crack width in an autogenous manner
Typical ECC
Crack width < 100 μmTensile ductility > 3-5%
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We are formulating preliminary EDC in Year 1
Q1 Q4
Material Development
Q6 Q8
Durability Demonstration
Material Optimization
We are currently at Q4 for preliminary EDC with tensile ductility > 2%
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PE PVA Nylon PP Aramid PBO PET Steel Basalt Carbon Glass --
0
1
2
3
4
5
6
7
8
9
Com
posit
e Ten
sile S
train
Capa
city,
%
Fiber Type
Typical strain capacity of PVA-ECC
PP fiber was chosen due to low cost and high composite ductility
SteelPVA
PPPET
PEPBO
NylonGlass
CarbonBasalt
AramidAcrylic
0 20 40 60 80 100 120 140 160 180 200
PVA fiber cost range
Fiber cost per unit volume, 1000 US$/m3
Mono and/or hybrid fiber systems are examined for EDC
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EDC achieves tensile ductility >8% at 28 days using PP fibers
PP Fiber + Non-Optimized LC3 Binder
Tensile Strength = 2.9 ± 0.3 MPaTensile Strain Capacity = 8.4% ± 1.2%
Fiber diameter = 12 µm
Average crack width = 56 µm when loaded to 2%
Fiber pulled out at fractured surface
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EDC will be optimized on pore/flaw network and crack localization
UC Berkeley Group is employing micro-CT to understand the role of pore/flaw network in EDC crack localization and composite ductility
PP Fibers
500µm
Pore/Flaw
Crack
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Challenges and Strategies
Challenges:1. Control crack width down to < 50 μm while keeping tensile ductility > 3%2. Ensure desirable EDC workability and polymeric fiber dispersion
Strategies:1. Adopt ECC micromechanical framework to guide EDC design2. Tailor LC3 particle design and formulations to optimize EDC rheology
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Potential Partnerships
We welcome collaborations in• Standardizing EDC for field applications
• Developing large-scale testbeds to demonstrate extreme durability at scale
We offer capabilities of• Innovating strategies for controlling crack width for durable binders
• Optimizing micromechanical design for fiber-reinforced cementitious composites
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Summary
Concept: Durable Chemistry + Autogenous Crack Width Control
Team: University of Michigan (Leading Institute)Georgia Tech & UC Berkeley
Goals: Low-energy concrete with 5X durabilityBuilt-in self-healing capability to lower O&M cost and energy consumption
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Development of an Extremely Durable Concrete (EDC)�– A Novel Approach Coupling Chemistry and Autogenous Crack Width Control���Victor Li, University of Michigan��Team Members: �Kimberly KurtisGeorgia Institute of Technology�Paulo MonteiroUniversity of California BerkeleyEnhancing durability by chemistry and crack control The TeamWe will deliver a suite of EDC products within 2 yearsThe goal will be achieved by coupling chemistry and crack control ECC controls crack width in an autogenous mannerWe are formulating preliminary EDC in Year 1PP fiber was chosen due to low cost and high composite ductilityEDC achieves tensile ductility >8% at 28 days using PP fibersEDC will be optimized on pore/flaw network and crack localizationChallenges and StrategiesPotential PartnershipsSummarySlide Number 14