María Celeste Torrijos

Development of Alkali-Silica Reaction under Compressive Loading and Its Effects on Concrete Behavior

The behavior of a reference concrete is compared to that of concrete strongly affected, under long-term compressive loads, by alkali-silica reaction (ASR) in this paper. Saturated condition cylinder storage took place at temperatures of 21 and 38 degrees C (70 and 100 degrees F). There was periodic measurement of concrete strains on a specimen set that remained unloaded and one loaded up to 40% of its compressive strength. There was also measurement of concrete prism expansion evolution when those prisms were in compliance with ASTM C1293 and stored under the same conditions as the cylinders. No significant differences were shown in the results in deformations under loads over time between specimens damaged by ASR and sound specimens; nevertheless, in concrete under sustained loads, ASR crack development changed. There was modification of residual mechanical properties as a consequence.