Abstract
To identify the condition of in filtration of sodium sulfate into mortar and grasp the relationship between ettringite and the period of in filtration, with mortar specimens immersed in sodium sulfate solutions having different concentrations (5%, 10%) for one year, this research newly studies and proposes an analytic thchnique using an X-ray micro-analyzer, etc. and observes in detail the condition of infiltration of sulfate ion, etc. into mortar and the growth of ettringite, on the basis of this technique.
As a result, the growth depth of ettringite was found to be proportional to the square root of the infiltration period, and the relationship with the condition of deterioration (change in weight, change in deflection oscillation, etc.) owing to that effect was in dicated.
