Best Practices Guide DRAFT Soliciting Comments for 30 Days As lab testing moves forward –Changes in limits may be fine tuned As field work moves forward.

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Presentation transcript:

Best Practices Guide DRAFT Soliciting Comments for 30 Days As lab testing moves forward –Changes in limits may be fine tuned As field work moves forward –Construction procedures will be amended –Casting sequence may be changed

Goals Tools for Engineers and Contractors –Design Aides (hard copy and web based) Durable Bridge Decks and Other Structures Reduced Life-Cycle Cost Longer Span Options with High Strength Concrete

Structural / Material Designer Element Type_________ YesNo Reinforced? YesNo Exposed to freezing or thawing? YesNo Exposed to salt or seawater YesNo Saturated YesNo Tidal Zone YesNo F c ’ at 28 days ___________

Structural / Materials Designer Reactive AggregateHR MR NR Early age f c YesNo Acceleration or deceleration zone YesNo Contact to studded tires or chains YesNo Exposed to SO 4 YesNo

Design Factors affecting Cracking Major –Restraint Moderate –Continuous spans –Girder Size –Girder type –Deck Thickness –Alignment of rebars

Material Factors Affecting Cracking Major –Heat of Hydration –Cement Content/Type –Aggregate Type –Modulus of Elasticity –Creep Coefficient Moderate –Coefficient of Thermal Expansion –Paste Volume –W/cm ratio –Deck Thickness –Silica Fume

Construction Factors Affecting Cracking Major –Weather –Time of Casting Moderate –Curing period –Curing measures –Finishing procedures

QC/QA – before casting Planning, time scheduling, assignments Material selection and maintaining quality Inspection of batch plant and trucks Qualification of employees (certification) Mixture designs to optimize only needed properties

QC/QA – during casting Planning, time scheduling, assignments Timely transport and delivery Fresh concrete testing Qualification of employees (certification) Verification of mixture design Continuous casting Minimize Finishing Curing measures immediately following placement

QC/QA – after casting Planning, time scheduling, assignments Maintenance of curing measures Hardened concrete testing Qualification of employees (certification) Monitor in-situ strength gain (maturity) Periodic evaluation for repair, rehab, or replacement.

Review and Comments Provide comments by mid June Second Draft will come out on the web in late June