ML19309G750

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Major Void Concrete Repair.
ML19309G750
Person / Time
Site: Marble Hill
Issue date: 07/25/1978
From:
GUST K. NEWBERG CONSTRUCTION CO. (FORMERLY NEWBERG
To:
Shared Package
ML19309G741 List:
References
WPN-25, NUDOCS 8005070495
Download: ML19309G750 (6)
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MARBLE HILL GENERATING STATION o

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WPN-25 MAJOR VOID CONCRETE REPAIR l

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TABLC CF CONTENTS q SECTION TITLE PAGE 1.0 Purpose 3 2.0 Applicability 3 3.0 Definitions and Abbreviations 3 4.0 Procedure 3 4.1 Void Preparation 3 1

4.2 Forming 3 4.3 Fill Material 3 I

L 4.4 Consolidation 4 4.5 Curing 4

4. 6 _ Clean-up 4 5.0 References 4

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ATTACHMENT

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A Weld-Crete Bonding Agent 5-7 L -

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Title:

WPN-25 MAJOR VOID CONCRETE REPAIR

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1.0 PvPSOSE To describe the methods for repairing major concreto defects.

2.0 APPLICABILITY This procedure shall apply to all concrete defects that are ciasci-fled as major in accordance with QAPN-10, " Inspection and Test -

Control", that require forming.

l 3.0 DEFINITIONS AND ABnREVI ATIONS Refer to Appendix A of the Newberg-Marble Hill Quality Assurance Manual.

4.C PROCEDURE 4.1 Void Preparation Remove all unsound material using automatic chipping hammers or by hand. Extreme care will be taken to avoid nicking re-inforcing steel. Cross sections of individual bars shall not be reduced more than 5% of the nominal area within a y length of 3 bar diameters. Larger notches shall be reported to the Consulting Engineers for evaluation. Bottom and sides of void shall be cut sharply at least,900 with face of con-crete surface. The top edge of void should be cut to a fairly horizontal line or if the configuration makes it advisable the top cut may be stepped dcwn and continued on the horizontal line. The top edge will also be cut on an upward slope from the back of void tcward the face of finish surface to prevent

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air entrapment. All interior corners shall be rounded to a minimum radius of 1". Inside void surfaces will be treated ..

with thc. Weid-Crete Bonding Agent (Att'achment A), and the

, area inspecte,d as per QAPN-10, " Inspection and Test Control".

4 .'2 Forming void area will be fomed to the design surf ace. Forms shall be mortar tight. A " chimney" will be incorporated in the form top to allow for insertion of grout or concrete into void area. If conditions warrant, forms may be placed in sections so that concrete may be placed in lif ts of 12" deep.

Small diameter holes (<\") will be drilled at 12" intervals to act as vent and inspection points.

4.3 Fill Material Grout the same compressive strength as the structural member will be used in voids that have a high rebar density that could prevent proper consolidation. Other voids will be filled with concrete of the same compressive strength as the structural member.

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WPN-25 MAJOR VOID CONCRETE REPAIR

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4.4 Consolidation Consolidation will be accomplished by use of pencil vibrators for voids equal or larger than 4" deep, or tapping face of form by use of hammers for voids less than 4" deep. Above methods will be used during placement until grout weeps thru the inspection holes.

4.5 Curing If forms are removed prior to completion of the seven-day cure period, the surface will be sprayed with an approved ,

curing compound immediately after the forms are removed.

A second application of curing compound will be made at seven days.

4.6 Cican-Up Concrete or grout protrusions will be chipped of f and area . ,

ground to match adjacent area. protrusions shall be removed by working up from the bottom to avoid concrete breaking out of the repair.

5.0 REFERENCES

5.1 " Concrete Manual", Water Resources Technical Publication, Eight Edition.

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5.2 CAPN-10, " Inspection and Test Control".

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ATTAC!! MENT A Wcld-Crete Bonding Agent ftCE-esta suLtatte a0. 330 30epte C0ecettt Seles watt The felleetag hee been esed se esseessfelly plees e telefereed eeeerete sneer well headed to se ealet tog seestese sheer wollt it) PetPeesteet wette-Serfaces to tocatee veld-Cretee MUST BE stavCrusetti s06ee med ctrae, free fees assee essentel. does, ett. seesee. woe. leese po tet , elldee. test. lettesee, effle=

eessoase er est f eten se estet ten.

Weld-Cretee say be oppised ever dry or deep surfaces felteteese all water peddleet. 00 e07 APPtt where hydvesseste pressere le present to the essegrese, egy eartag er fere*eeteeee eteSewede opplied es eerfasse se reeelee seee*tteleve topplege eens to scopettble utsh Weld. Crete #.

asehere er es her vat t s tee sees be set tese estetnog sell peter to apptteestee of weld-Cretee.

l2l ePPLICaflos OF w tt3*C 9 tit p* *we ld *Ce e t ep to reede to ese**

  • - De n0T asa vetta. appt, head.Crese* eedaleted Itke a eeee of estet estes erweh. rolles, or spree to fore e seeslevees eine ille ever eettre beedtog euefsee of estatteg eenerete well and ellee to dry. Seecs steel retsfetetog one forevert; snes, ees.

stee op to 10 dere aftee opplicottee'ef toe toneses egens etore the ese somerose well se speetfled. le she latereal netweee the applieseles of the beesteg agget med plateeees of geme eet e, toe Weld-Crete # file steeld be preteeted fece diet. does med detrie se well se see eseeente. Peter se plateeent of seestete. toepees a

esefaces to seemse thes e seestevees time f8le of weld-Cresee eeeere the need sees.

(e v e r e g e-*we s d .C r e s ee severe espressestely 200 100 eg. fa. per sellee, depeedtog egee type of serfeee end eethod of appiteettee. -

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