Effect of Blast Furnace Slag Fine Aggregate
for Freezing-and-Thawing Durability of Mortar
and Concrete under Salt Existence Environment
No.23 March 2018 - Special Issue on “Steel Sheet for Can-making”, “Steel Bar and Wire Rod” and “Slag Products”
Effect of Blast Furnace Slag Fine Aggregate for Freezing-and-Thawing Durability of Mortar and Concrete under Salt Existence Environment
TAKAHASHI KatsunoriWATANABE KeijiNIITANI KyojiHOSOTANI Kazuyoshi
Abstract
Cement concrete using blast furnace slag fine aggregate (BFSA) has been found to have excellent freezing-and-thawing durability, in case mixture conditions are appropriate. In this study, freezing-and-thawing durability under salt existence environment was investigated for mortar and concrete using BFSA, and testing of fatigue durability of concrete slab was conducted. Resistance of concrete to freezing and thawing in NaCl (aq) was improved by using BFSA. Reaction between BFSA and cement paste boundary and suppression of salt penetration might have a role for the improvement. BFSA concrete with compressive strength of 70 N/mm2 showed enough load bearing ability after 88 000 tracks in wheel loading fatigue test with applied load of 200 kN under wet condition.
