各種溶液浸漬下におけるコンクリートのアルカリ骨材反応に関する研究

Abstract

The damage of concrete structure due to alkali-aggregate reaction (AAR) has been occurring in each place. Especially, it newly increases by the use of the de-icing salts such as sodium chloride. In this paper, AAR concrete prisms were made with reactive cherty aggregate. Total alkali contents of the concrete were adjusted in the quantity of 3,6,9kg/m^3 alkali as Na_2O eq. by the addition of NaOH reagent. Concrete prisms were stored at 40℃ and not lower than 95% RH, in various kinds of solution such as 1M NaCl, 1M CaCl_2,1M NaOH, 1M KOH, 1M Na_2SO_4 and 1M MgSO_4 solution, artificial sea water and city water. Expansion behavior of the AAR concrete prisms was investigated, and effects of NaCl and other solutions on AAR were discussed on the basis of experimental results. The expansion of the AAR concrete prism was accelerated by 1M NaCl solution and 1M Na_2SO_4 solution.