✦ LIBER ✦

Reaction of Ca(OH)2 and of Ca(OH)2 + CaSO4.2H2O at various temperatures with feldspars in aggregates used for concrete making

✍ Scribed by J.H.P. van Aardt; S. Visser

Publisher: Elsevier Science
Year: 1978
Tongue: English
Weight: 240 KB
Volume: 8
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(78)90076-5

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✦ Synopsis

The reaction between calcium hydroxide and minerals containing alumina forms C~A-hydrates and/or hydrogarnet (calcium-alumina-silicate hydrate), depending on the temperature.

Alkali-feldspars furnish alkalies during the reaction.

C4A-hydrates react with calcium sulphate to produce ettringite.

La r~action entre l'hydroxyde de calcium et des min~raux contenant de l'alumine a comme r~sultat la formation de C~A hydrates ou de l'hydrogrenat (hydrates aluminosilicate de calcium), ou les deux selon la temperature.

Les feldspaths alcalins donnent des alcalis durant la r~action.

Les C~A hydrates r~agissent avec le sulfate de calcium pour produire l'ettringite.

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