thaumasite


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thaumasite

(ˈθɔːməˌsaɪt)
n
a colourless or white silicate mineral, Ca3Si(CO3)(SO4)(OH)6·12(H2O)
References in periodicals archive ?
At Bamfurlong Lane Bridge and Golden Valley North and South Bridges the schemes will focus on replacing weakened bridge piers and foundations due to thaumasite sulphate attack, which can reduce the affected concrete to a soft crumbly material.
Some authors [6] describe thaumasite as hydration product of Portland cement clinker minerals and limestone constituents.
Thaumasite sulphate attack at the concrete structures of the Ference Puskas stadium in Budapest.
The foundations of three bridges, including Stroud Road Brookthorpe Bridge, have been attacked by thaumasite, which is a severe form of sulphate attack and can reduce affected concrete to a soft crumbly material - to find out more watch this video.
Gypsum commonly includes sections which are partially altered to thaumasite.
The foundations of three bridges, including Staverton Hayden, have been attacked by thaumasite, which is a severe form of sulphate attack and can reduce affected concrete to a soft crumbly material.
Thaumasite has been found as a white, micro-fibrous, crackled crust, several square centimeters in area, on fracture surfaces in a highly weathered serpentine-bearing dike in the alcove (GSC APS 724 and 730).
The foundations of all these bridges have been attacked by thaumasite, which is a severe form of sulphate attack and can reduce affected concrete to a soft crumbly material.
At Yuksporr, in a veinlet crosscutting urtite, as zones in thomsonite-Ca; associated minerals are: calcite, fluorapophyllite, tobermorite, thaumasite and barite.
5-cm, rising in jumbles from black massive hausmannite matrix, with occasional 5-mm white crystals which may be calcite, thaumasite, ettringite, or all of these.
Also from here come good specimens of prehnite with sharp, blocky, white crystals to 5 mm, as well as thaumasite, calcite, and black subhedral wurtzite crystals in massive anhydrite.