Diagnosis of a Case of Harmless Alkali-Silica Reaction in a Cracked Concrete Pavement

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: Diagnosis of a Case of Harmless Alkali-Silica Reaction in a Cracked Concrete Pavement

Author(s): L. F. Luco and R. J. Torrent

Publication: Special Publication

Volume: 212

Issue:

Appears on pages(s): 521-536

Keywords: alkali-silica reaction; cracks; diagnosis; pavement; petrography

Date: 6/1/2003

Abstract:
This paper describes a cracked concrete pavement that had to be repaired. A superficial analysis had established the symptoms of alkali-silica reaction (ASR), to which the damage of the pavement was attributed. However, using such diagnosis techniques as SHRP-C-315 and microscopy observation of thin sections, it was established that the mapped cracking originated at an early-age of the concrete. The scarce symptoms of ARS were found only in a limited area of the slabs' section, just below the crack tips, with only slight damage associated with it. This was attributed to the "wick" action of the cracks, which led to a concenrration of alkali ions there. This more accurate diagnosis led to a much more simple and economical repair Strategy than what would have been required had the cracking been caused by ASR.