H IGH E ARLY S TRENGTH C ONCRETE & UHPC C ONNECTIONS UHPC O - PowerPoint PPT Presentation

B RIDGE 1-438 N ICH OLAS D EAN D EL D OT B RID GE D ESIGN

• T IME IS OF THE E SSENCE • E XISTING S ITE C ONDITIONS • T IMING • P RECAST I TEMS • H IGH E ARLY S TRENGTH C ONCRETE & UHPC C ONNECTIONS • UHPC O VERLAYS

• P ROSPECTIVE B IDDER N OTE #11 • A RMY C ORPS OF E NGINEERS N ATIONWIDE P ERMIT P ROGRAM E XPIRES 3/ 17/ 17 M UST HAVE EXECUTED CONTRACT , WHICH ALLOWS APPROVED PERMITS • A 1 YEAR EXTENSION

• E XISTING C ONCRETE W EIR AND USGS M ONITORING S TATION • USGS C ONTACT • A NTHONY T ALLMAN • 302-734-2506 EXT . 223

• U TILITY P OLES AND TREES IN CLOSE PROXIMITY TO ROADWAY • C RANE C ONSIDERATIONS M AY NOT BE ABLE TO SWING BOOM • L ARGER CRANE MAY BE REQUIRED • • S TAGING C ONSIDERATIONS S TORAGE OF EQUIPMENT • D ELIVERIES •

• 7 D AYS FOR C LEARING AND G RUBBING IN ADVANCE OF U TILITY R ELOCATIONS ( SINGLE LANE CLOSURE PROVIDED BY CONTRACTOR ) • 42 C ALENDAR D AYS FOR U TILITY R ELOCATIONS ( SINGLE LANE CLOSURE PROVIDED BY CONTRACTOR ) • 33 C ALENDAR D AYS FOR B RIDGE C ONSTRUCTION ( FULL ROAD CLOSURE PROVIDED BY CONTRACTOR ) 4 WEATHER DAYS ALLOTTED SPECIFICALLY FOR BRIDGE CONSTRUCTION • • 7 C ALENDAR D AYS AFTER BRIDGE CONSTRUCTION IS COMPLETED FOR D ELMARVA P OWER TO RE - ENERGIZE ( SINGLE LANE CLOSURE PROVIDED BY CONTRACTOR ) • C ONTRACTOR NEEDS TO COMMUNICATE WITH UTILITY COMPANIES ABOUT TIMING C AN BRIDGE WORK OCCUR CONCURRENTLY WITH UTILITY WORK ? • R ELOCATIONS MAY NOT REQUIRE ENTIRE ALLOTTED TIME •

• 100% P RECAST B RIDGE E LEMENTS T IGHTER TOLERANCES • P LACEMENT OF E LEMENTS MUST BE PRECISE / ACCURATE • • 14” X 14” PRECAST PILES T IGHTER TOLERANCE FOR DRIVING (2” IN ANY DIRECTION AT TOP OF PILE ) • • 24” X 48” P RECAST A DJACENT B OX B EAMS • E XTERIOR B EAM – P RECAST B ARRIER H EAVY , ECCENTRICALLY LOADED LIFTS • • S HEAR K EY C ONNECTIONS UHPC S HEAR K EYS • • P RECAST A BUTMENTS • S HIPPED IN TWO SECTIONS PER ABUTMENT • H EAVY LIFTS • P RECAST W INGWALLS • W INGWALL SECTIONS TO BE CANTILEVERED OFF OF ABUTMENTS

• A BUTMENT / P ILE C LOSURE P OUR • W INGWALL / A BUTMENT C ONNECTION

• D IFFERENT SHEAR KEY THAN TYPICAL • S URFACE PREPARATION AND INSTALLATION ARE KEY • R EACH OUT TO UHPC M ANUFACTURERS BEFORE CONSTRUCTION BEGINS • D IFFERENT MATERIAL PROPERTIES THAN NORMAL CONCRETE OR GROUT • UHPC R EPRESENTATIVE HAS A GREAT DEAL OF EXPERIENCE AND KNOWLEDGE • S ATURATED S URFACE D RY (SSD) & W ATER TIGHTNESS

• UHPC B ACKWALL TO BE POURED SIMULTANEOUSLY WITH SHEAR KEY JOINT • B ACKWALL TO BE POURED TO TOP OF BEAM

• N EW P RODUCT • D IFFERENT MATERIAL PROPERTIES THAN NORMAL CONCRETE AND GROUT • S TIFFER THAN THE UHPC MIX FOR JOINTS • S URFACE PREPARATION AND INSTALLATION ARE KEY • R EACH OUT TO UHPC M ANUFACTURERS BEFORE CONSTRUCTION BEGINS • D EFER TO UHPC R EPRESENTATIVE ’ S EXPERTISE

• T IMING • 33 C ALENDAR D AYS FOR BRIDGE CONSTRUCTION • P RECISION • A CCURACY IN FIELD MEASUREMENTS AND PRECAST ELEMENT PLACEMENT ARE KEY • UHPC • N EWER M ATERIAL • Q UALITY C ONTROL • F OLLOW UHPC R EPRESENTATIVE ’ S A DVICE • P REPARE A PLACEMENT P LAN PRIOR TO PRE - CONSTRUCTION MEETING