INHIBITING EFFECT OF BLAST FURNACE SLAG ON ASR EXPANSION OF SEAWATER-MIXED CONCRETE

Abstract

The suppressing effect of blast furnace slag（BFS）on the ASR expansion of seawater-mixed concrete was investigated. Replacement level of BFS above 40wt％ was turned out to prevent ASR expansion through the concrete prism tests for 3 years. Some analytical results suggested that the formation of C-S-H with lower Ca/Si ratio contributed to reduction in alkalinity of pore solution. From these results and thermodynamic modeling, the method to decide replacement level of BFS to prevent ASR expansion was discussed.