Condensed Silica Fume in Concrete, FIP State of the Art by CEB FIP FIP Commission on Concrete PDF
By CEB FIP FIP Commission on Concrete
This document offers a finished evaluation of the houses of concrete containing condensed silica fume(CSF) at each one level of hardening, emphasizing the advancements won in longevity.
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Extra info for Condensed Silica Fume in Concrete, FIP State of the Art Report
Volumstabilitet i blandingssementer med rdjernslagg og silikastov. F C B / S I N T E F , Norwegian Institute of Technology, T r o n d h e i m , 1 9 8 1 , Report S T F 65 A 8 1 0 3 4 . (In Norwegian). Maage M . Modifisert Portland cement. F C B / S I N T E F , Norwegian Institute of Technology, Trondheim, 1983, Report S T F 65 A 8 3 0 6 3 . (In Norwegian). Buil M . and Acker P. Creep of silica fume concrete. , 1985, 15, 4 6 3 - 4 6 6 . American Society for Testing and Materials. ASTM Philadelphia, C 1 5 7 .
L . and Vennesland 0 . Pore solution composition and chloride binding capacity of silica-fume cement pastes. Mater, and Structs, 1983, 16, N o . 9 1 , 1 9 - 2 5 . 2 7 . Diamond S. Scientific basis for the use of microsilica in concrete. Presented at First S e m . on Elkem Microsilica Technology, Elkem Chemicals, Sao Paulo, Sept. 1984. 2 8 . Meland I. Hydratasjonsvarme, hydratasjonsforlop og reaktivitet i flygeaskesement og PC sement med- og uten silikastov. F C B / S I N T E F , N o r w e g i a n Institute of Technology, Trondheim, 1983, Report STF65 A83022.
Their results showed that as the CSF dosage increased, the fraction of the chlorides available in the pore water also increased. They suggested this effect to be caused by the lowered pH value, which increases the solubility and thereby reduces the quantity of Friedel's salt. The latter, a calcium chloro-aluminate-hydrate, is thought to be the dominant factor in binding chloride ions during cement hydration. The lower pH of CSF concrete also indicates that the threshold concentration of chlorides in the pore water, which will induce steel depassivation, is reduced.
Condensed Silica Fume in Concrete, FIP State of the Art Report by CEB FIP FIP Commission on Concrete