Properties of Iron and Steel Slag Hydrated Matrix
Exposed in Sea Area for Long Period
No.23 March 2018 - Special Issue on “Steel Sheet for Can-making”, “Steel Bar and Wire Rod” and “Slag Products”
Properties of Iron and Steel Slag Hydrated Matrix Exposed in Sea Area for Long Period
INOUE YotaroMATSUNAGA HisahiroWATANABE Keiji
Abstract
“Ferroform™”, iron and steel slag hydrated matrix, consisting mainly of steelmaking slag as aggregate and ground granulated blast furnace slag as binder, were exposed in sea area for 10 years and were examined. Many organisms were confirmed on the surface of samples at undersea zone. The compressive strength of test sample was 27-30 N/mm2, which is more than twice as high as same sample after standard curing for 4 weeks. The apparent Cl diffusion coefficien was 0.04-0.16 cm2/year at tidal zone and 0.3-0.5 cm2/year at undersea zone. The average neutralization depths at tidal zone was 2.5 mm, and the neutralization rate coefficient was smaller than that of ordinary portland cement concrete and slag cement concrete. Pore size was small, which is consistent with the results of small neutralization rate coefficient. Generation and eluviation of Friedel’s salt, and condensation of SO3 were confirmed.
