[V-239] A MICROSCALE STUDY ABOUT TIME-DEPENDENT MECHANICAL PROPERTIES OF CONCRETE WITH ALKALI SILICA REACTIONS
Keywords:Alkali Silica Reaction, ASR gel, Compression, SEM-EDS, Nano indentation
The time-dependent mechanical properties of concrete with ASR expansions are studied. Compression tests were conducted and the stiffness recovery of ASR-expanded concrete are observed. Then, the time-dependent chemical compositions and mechanical properties of ASR products inside cracks were focused. With the SEM-EDS on ASR products inside the specimens of 10 and 52 weeks, it was shown that matured concrete had much calcium in the ASR products. E-moduli of ASR products inside cracks were determined by nano-indentation. The stiffness increased as the calcium content of ASR gel increased.
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