2) Physical and chemical corrosion occurred in the tunnel lining, and the corrosion products included sodium sulfate, calcium carbonate, gypsum, ettringite, and thaumasite. 3) In China, this type of ...

If more sulphur is released, the mineral thaumasite is formed. This process reduces the strength of the concrete by dissolving important constituents such as calcium silicate hydrates, and can ...

The pyrrhotite mineral in concrete blocks, when exposed to oxygen and moisture releases sulphur which turns into sulphuric acid, which attacks the cement hydrates and creates secondary sulphate ...

Lack and quality decrease of supplementary cementing materials (SCMs) such as fly ash and granulated blast-furnace slag is increasingly prominent in China. Thus, the use of coal gangue (CG) and coal ...

He identified thaumasite sulphate attack, previously unknown in Europe, in the internal walls of some newly built houses at Stoke-on-Trent (UK) in February 1969 and established for the first time how ...

On the other hand, Brough and Atkinson, used Raman spectroscopy to detect the presence of a silicate mineral called thaumasite in concrete structures, and for forensic analysis and monitoring of its ...

These are my nesosilicates. Nesosilicates are the simplest silicates - orthosilicate (SiO 4) tetrahedrons unbonded to each other. Because of the nesosilicates' hardness, higher desnity than other ...

According to the agency, four bridges between junctions 10 and 12 of the M5 have been attached by thaumasite, a severe form of sulphate attack that can "reduce affected concrete to a soft crumbly ...

Save to read list World Cement, Tuesday, 14 January 2014 15:15 Figure 3. XRD analysis of a calcium sulfate source. (Source: Argos Research and Development Center.) Again, a question arises: how can ...