Glassboro State College Swimming Pool

T E C H N I C A L R E P O R T

TecSealtm Negative Force Leak Repair Process is An Improved Method of Repairing Leaks in Concrete, Masonry & Stone

Report of Cementitious Grouting of Leaking Fractures and Cavitation Filling Sealing With TecSealtm Glassboro State College Glassboro, NJ

TECVAC, Inc. ¤ 39482 Rickard Road Lovettsville, VA 20180

TECVAC, Inc.

1998 © ALL RIGHTS RESERVED

Office 703.742.9186

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FAX 703.742.9231

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Leak Repairs to Swimming Pool Glassboro State College Glassboro, NJ In the final stage of completion, the general contractor was defaulted by the bonding company and its incompleted construction of the student activities center was left in disarray. Among other things, ground water was leaking profusely into the olympic size swimming pool that was constructed within the student activities building facility and nearly completed.

Careful evaluation of the condition of the shotcrete construction of the pool by the bonding company and their engineers, coupled with the concerns of the College Administration Board and their intent to receive a finished product conforming to the very stringent standards of NCAA, leaned the reconciliation talks toward total tear out and re-construction of the entire pool. This action presented a formidable and costly proposition for the bonding company and any completion contractor.

Vacuum Technicians were summoned to evaluate the conditions and whether or not the Vacuum Injection/Impregnation Processes could be capable of restoring the originally intended construction quality of the pool. More importantly, whether or not the Vacuum Processes would be capable of producing a water-tight structure.

After an attentive review of the as-built conditions, a plan was developed and proposed a turn-key repair. A repair that would guarantee the employed methods would meet the requirements of the bonding company and that would be acceptable to the Administration of the college.

An Impact-Echo survey was first performed on the floor and walls of the swimming pool that accurately located the defects. These defects were identified as including delaminations, fractures and voids and were mapped upon a grid chart for later repair reference.

To combat the high water table, evident to within five feet of the top of the pool, and to relieve the hydrostatic pressures, a deep well and large pumping system were installed and located on the exterior of the student activities building. After the water table was receded well below the bottom elevation of the pool floor, grouting crews accessed the exterior sides of the walls and floor of the pool and installed a cementitious grout curtain. This cement curtain completely enveloped the pool structure with a three-four inch layer of waterproofing cement.

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Then, after each of the located defects in the structure were repaired using the Vacuum Injection/Impregnation Process, another independent ImpactEcho survey was performed to inspect the extent and integrity of the repairs completed, and to ensure no other defects had been missed.

Upon completion of the cementicious grout curtain installation, repairs of the mapped defects in the pool walls and floor, and the final independent survey of the repairs, an ultimate test of the entire work was at hand; the pumps were turned off, allowing the ground water to again seek its high level surrounding the pool.

After fourteen hours, the water was determined to be within five feet of the top of the pool and the repairs to walls and floors were inspected for leaks.

There were none.

After thirty-six hours of continuous exposure to the hydrostatic pressures of the high water table, there was not one single leak discovered within the pool.

The repairs were deemed a success and the pool finishing operations, coatings and tile, were then completed.

The repairs performed were estimated to have saved the bonding company over $1 million when compared with their only other alternative, complete tear out and replacement of the structure.

Tecvac, Inc. 39482 Rickard Road Lovettsville, VA 20180 Office 703 742-9186 Fax 703 7429231 Toll Free 800 847-9324

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