Shotcrete: Surveillance for Durable Structures--Case Histories

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Title: Shotcrete: Surveillance for Durable Structures--Case Histories

Author(s): Steven Gebler

Publication: Special Publication

Volume: 126

Issue:

Appears on pages(s): 869-900

Keywords: quality control; shotcrete; specifications; tension tests; General

Date: 8/1/1991

Abstract:
Addresses shotcrete used primarily for rehabilitating concrete structures. Field experience has demonstrated that the use of detailed specifications and strict on-site surveillance can minimize workmanship problems that have been a concern with the shotcrete process. This paper discusses key points that make the specifications a useful tool. Types of shotcrete quality found in practice are illustrated. Preconstruction testing, ongoing quality control testing during construction, a core grading system, and tensile bond strength tests are discussed. Several brief case histories are presented where the use of the core grading system has proved successful. In the case histories, an independent laboratory conducted evaluations of in-place shotcrete, developed specifications for new work, and provided on-site surveillance during placement. The case histories include a drydock, cooling tower, parking garage, swimming pool, lighthouse, and two chimneys. The system adopted has resulted in structures that should provide durable, long-term service.