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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

Office 703.742.9186 ¤ FAX 703.742.9231 TECVAC, Inc.

1998 © ALL RIGHTS RESERVED

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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 Impact-

Echo 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