The effect of a Pfa with a high total alkali content on pore solution composition and alkali silica reaction

Autor:	P.J. Nixon, C.L. Page, R. Bollinghaus, I. Canham
Rok vydání:	1986
Předmět:	Inert Cement Aggregate (composite) Solution composition Waste management Chemistry Alkalinity Building and Construction Alkali metal Dilution Chemical engineering Alkali–silica reaction General Materials Science Civil and Structural Engineering
Zdroj:	Magazine of Concrete Research. 38:30-35
ISSN:	1751-763X 0024-9831
DOI:	10.1680/macr.1986.38.134.30
Popis:	Synopsis The effectiveness of a pfa with a high total alkali content in suppressing expansion caused by alkali silica reaction has been investigated using concrete specimens containing flint sand. The observed behaviour has been related to the effect of the pfa on pore solution composition. With such a slowly reacting aggregate, typical of those found in concrete affected by ASR in the UK, 20 or 30% of the pfa stopped any deleterious expansion. The effect of the pfa on the pore solution depended on the age and the alkalinity of the cement. At 28 days there was a net contribution to the alkalinity of moderate or high alkali cement pastes but at longer ages the pfa reduced the alkalinity below that produced by dilution with an inert material. In very low lkali cement pastes however there was a net contribution to the alkalinity at all ages up to one year.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2c68bfd5ff39197ffcac1322a2af233d https://doi.org/10.1680/macr.1986.38.134.30 Zobrazit plný text záznamu