Abstract
The pore solution compositions of motar specimens which were made by changing reactive aggregates, water-cement ratios, and alkali contents were investigated. The specimens were stored under the open (non-sealed) environment like mortar bar methods (ASTM C 227, JIS A 5308). Then the pore solution compositions were compared with those stored under the sealed condition. At the same time, the restrained expansions of motar specimens which were made by same mix proportion and stored under the open condition were measured, and we correlated the expansions with the pore solution compositions. The following results were obtained : 1) The pore solution compositions of open stored mortar specimens were the same composition as those of sealed stored mortar speciments. 2) Alkali ion and hydroxide ion concentrations in pore solutions of open stored mortar specimens rapidly decreased with the passage of time, however the pH did not decrease less than 12 even at 6-months age. 3) Alkali ion and hydroxide ion concentrations in pore solutions showed good correlations with the expansion.
