✦ LIBER ✦

Expansion mechanism associated with the secondary formation of the U phase in cement-based systems containing high amounts of Na2SO4

✍ Scribed by G. Li; P. Le Bescop; M. Moranville

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 405 KB
Volume: 26
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(95)00199-9

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✦ Synopsis

The degradation of concrete by sulfates is generally related to the formation of AFt, but in some cases such as the cement stabilised wastes with a high amount of sulfates, the U phase is formed. This paper studies the influence of the U phase formation on the expansion of the C,A+C,S+Na,SO, system. It is shown that the U phase is formed by an external water supply and this reaction process results in a large expansion.

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The U phase formation in cement-based systems containing high amounts of Na2SO4

✍ G. Li; P. Le Bescop; M. Moranville 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 531 KB

Simulated cemented low level wastes containing high amounts of Na,SO, (10 -15%) were examined with respect to the mineralogy of the solid phases, chemical composition of the interstitial aqueous phase and immersion behaviour in water. All results reveal the formation of a mineral called U phase, fir