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The purpose of this paper is to develop an evaluation method for assessing the alkali-silica reactivity of concrete with a combination of the river sand and gravel used in the Hokuriku district. The 27 aggregate samples were collected from the stockpile of selected 8 ready-mixed concrete plants over the main river area in this district. The mineralogical features of the river sand and gravel, and their alkali-silica reactivity were tested by both the chemical method and the mortar bar method according to the specification by JIS A 1145-2001 and JIS A 1146-2001. Furthermore, a lot of cores were drilled from the concrete specimens, which were subjected to the accelerated curing condition of the immersion into 1N NaOH solution at 80°C or the saturated NaCl solution at 50°C in order to evaluate the alkali-silica reactivity of the concrete itself. By measuring the expansion behaviors of the cores in the accelerated curing condition, the rapid test method for the evaluation of the alkali-silica reactivity of the concrete itself was developed.

Development of Evaluation Method of Alkali-Silica Reactivity of Concrete Using River Sand and Gravel in Hokuriku District