SHRP 2 - R04 ABC Demonstration Bridge Design and Construction AASHTO Committee on Construction San Francisco, CA August 16, 2012
Iowa ABC Demonstration Project Two Week Closure US Highway 6 Bridge over Keg Creek 6 miles east of Council Bluffs, IA Normal construction duration weeks ABC construction duration 14 days
Project Innovations Precast modular bridge system (including precast approach pavement) Superstructure units create a semi- integral abutment for rapid construction Durable, moment-resisting UHPC joint between deck panels First bridge in US with full, moment- resisting UHPC joint at the piers
UHPC UHPC Particle Packing UHPC Constituents: Portland cement silica fume fine, uniformly graded sand crushed quartz steel fibers water superplasticizers
14-Day ABC Timeline
Bridge Farm Concept
Precast Abutments and Piers
Superstructure Modules
Deck Joint Forming
Deck Concrete Placement
Drilled Shaft Construction
Abutment Details Precast Abutment Construction Single piece barrel section SCC to fill pile pockets Temporary support of backwall until SCC reaches 3500 psi
Semi- Integral Abutment
Abutment Construction
SCC Concrete for Abutments
Precast Piers
Precast Pier Connections
Column Assembly and Bracing
Capbeam Assembly
Modular Superstructure
Pier Joint Detail C Pier 1 L C Pier 2 L
PT Retrofit for Modules
Module Transport
Module Assembly
Deck Joint Reinforcing
UHPC Mixing
UHPC Placement
FHWA/HFL Workshop
SHRP 2 - R04 ABC Demonstration Bridge Design and Construction Questions?