Title:
Durability fo Concrete containing condensed silica fume
Author(s):
Odd E. Gjorv
Publication:
Symposium Paper
Volume:
79
Issue:
Appears on pages(s):
695-708
Keywords:
alkali-aggregate reactions; concrete durability; corrosion resistance; electrical . resistance; freeze-thaw
durability; permeability; pozzolans; reinforcing steels;
silica; sulfate resistance.
DOI:
10.14359/6719
Date:
5/1/1983
Abstract:
It has been found that to a concrete with addional i e concrete gives the same permeability a kg cement containing no silica fume. .ion 0f 20% silica fume by 11 y 100 kg cement per m of S that of concrete with 250 Frost resistant concrete can be produced using silica fume. A 15% replacement of cement (OPC) by silica fume shows durability similar to sulphate resisting portland cement exposed to sulphate solutions. Silica fume binds up the alkalis of the cement and reduces the detrimental alkali-silica reactions. Addition of IO-20% silica fume does not reduce the pH to a level lower than that of a saturated 1, Ca(OH)z-solution. The electrical resistivity of the concrete is increased dramatically. Monitoring of existing structures with such concrete has shown that embedded steel is well protected.