Thermal behavior of sodium hydroxide-structural concrete composition

Kikuchi, Shin; Koga, Nobuyoshi*; Seino, Hiroshi

no journal, , 

Under postulated accidental condition of sodium-cooled fast reactor, liquid sodium spilled into the floor may lead to fail the steel liner. Consequently, sodium-concrete reaction comes to occur by direct contact of liquid sodium with structural concrete. In this study, the NaOH-SiO reaction that is one of the possible reactions was investigated using a differential scanning calorimetry (DSC) equipped with videoscope. From experimental results, sudden blowout of the reactants was observed after melting of NaOH, which is provably attributed to the sudden evaporation of water vapor. In comparison with the other possible reactions, NaOH-SiO reaction is relatively rapid in terms of kinetics. The major solid product of NaOH-SiO reaction was identified as sodium silicate from XRD analysis.