Session Start Date

5-6-1984

Abstract

Rock boring mollusks and sponges are infesting the concrete cylinder piles supporting the Juaymah NGL Trestle located in the western Arabian Gulf. The calcareous aggregate used in pile fabrication provides a favorable substrate for borer activity. Rock boring organisms are common in the Arabian Gulf and typically inhabit nearshore reefs and exposed limestone bottom areas. Although the entire trestle wetted area is subject to attack, infestation is concentrated in the area adjacent to reefs and limestone, on the down current pile face and near the water surface. Boring organisms pose a significant threat to the trestle structural integrity, in that boreholes will deteriorate concrete and expose outer pile reinforcement to corrosive sea water. Serious pile damage is imminent. The entire submerged portion of the structure will be adversely effected if repairs are not performed. Pile deterioration to date has been retarded by the excellent durability of the concrete cylinder piles. Several pile repair systems have been evaluated. Molded fiberglass jackets with epoxy grout fill were selected on the basis of borer and abrasion resistance, low profile, service life and favorable open sea installation characteristics.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

First Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-6-1984

Document Version

Final Version

Rights

© 1984 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 6th, 12:00 AM

Rock Borer Attack on Juaymah Trestle Concrete Piles

Rock boring mollusks and sponges are infesting the concrete cylinder piles supporting the Juaymah NGL Trestle located in the western Arabian Gulf. The calcareous aggregate used in pile fabrication provides a favorable substrate for borer activity. Rock boring organisms are common in the Arabian Gulf and typically inhabit nearshore reefs and exposed limestone bottom areas. Although the entire trestle wetted area is subject to attack, infestation is concentrated in the area adjacent to reefs and limestone, on the down current pile face and near the water surface. Boring organisms pose a significant threat to the trestle structural integrity, in that boreholes will deteriorate concrete and expose outer pile reinforcement to corrosive sea water. Serious pile damage is imminent. The entire submerged portion of the structure will be adversely effected if repairs are not performed. Pile deterioration to date has been retarded by the excellent durability of the concrete cylinder piles. Several pile repair systems have been evaluated. Molded fiberglass jackets with epoxy grout fill were selected on the basis of borer and abrasion resistance, low profile, service life and favorable open sea installation characteristics.