Effects of Accelerated Test Conditions on ASR Expansion of Concrete Core

The kings of solution for immersion of the specimens (NaOH solution and NaCl solution), the solution concentration, and the storage temperature were selected as experimental parameters to examine their effects on ASR expansion of concrete.The following results were obtained from experiments: (1)ASR expansion became small when the concentration of the solution rose excessivery at low storage temperature, but it increased with rising concentration of the solution at high storage temperature. (2) ASR expansion became small when the storage temperature rose excessivery in low concentration of the solution, but it increased with rising storage temperature in high concentration of the solution. (3) The specimen immersed in the NaOH solution generated lager expansion at the early stage than the specimen in the NaCl solution. The specimen immersed in a NaOH solution of 1 mol/1 at 60℃ generated the largest expansion at the early stage.