Unexpected expansion of concrete made with laumontite containing aggregates under seawater condition

H. Hamada, T. Yamaji, T. U. Mohammed, K. Torii

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Deterioration of steam-cured concrete specimens made with laumontite contained aggregates, under marine submerged, tidal, and atmospheric exposures for 30 years, was investigated. The expansion of the specimens exposed to the marine submerged and tidal exposures ranged from complete disintegration to moderate deterioration. The deteriorated regions contains little calcium hydroxide as well as calcium silicate hydrates, but rich with ettringite, brucite, and calcite. At the deteriorated region, white rim of ettringite crystal is found around the aggregates. Ettringite, brucite, and calcite are also found at the voids as well as along the cracked path. However, no visible crack was found on the surface of the atmospheric specimens. It is clearly understood that exposure condition is a governing factor related to the expansion caused by the laumontite mineral. Fortunately, the damage of real structures due to this special deterioration has not been clearly recognized in Japan, and other countries. However, the aggregate containing laumontite mineral is used for concrete fabrication, a careful quality control will be necessary.

Original languageEnglish
Title of host publication7th CANMET/ACI International Conference on Durability of Concrete
EditorsV. M. Malhotra
PublisherAmerican Concrete Institute
Pages571-588
Number of pages18
ISBN (Electronic)9780870312076
Publication statusPublished - Mar 22 2006
Externally publishedYes
Event7th CANMET/ACI International Conference on Durability of Concrete 2006 - Montreal, Canada
Duration: May 28 2006Jun 3 2006

Publication series

NameAmerican Concrete Institute, ACI Special Publication
VolumeSP-234
ISSN (Print)0193-2527

Conference

Conference7th CANMET/ACI International Conference on Durability of Concrete 2006
Country/TerritoryCanada
CityMontreal
Period5/28/066/3/06

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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