A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Unexpected expansion of concrete made with laumontite containing aggregates under seawater condition
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.
Unexpected expansion of concrete made with laumontite containing aggregates under seawater condition
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.
Unexpected expansion of concrete made with laumontite containing aggregates under seawater condition
Unerwartete Ausdehnung des mit Laumontit-Zuschlagstoff erzeugten Betons unter Meerwasserbedingungen
Hamada, H. (author) / Yamaji, T. (author) / Mohammed, T.U. (author) / Torii, K. (author)
2006
18 Seiten, 9 Bilder, 5 Tabellen, 9 Quellen
Conference paper
English
| British Library Conference Proceedings | 2006
Structural concrete made with lightweight aggregates
| TIBKAT | 1967
Concrete made with crushed rock aggregates
| TIBKAT | 1978
Properties of Concrete Made with Plastic Aggregates
| Springer Verlag | 2019
Concrete made with aggregates of uniform size
Engineering Index Backfile | 1943