[L26] アルカリシリカ反応Ⅱ／凍害Ⅰ

[L1167] THE MITIGATION EFFECTS OF LITHIUM AND SODIUM COMPOUNDS ON ALKALI-SILICA REACTION OF CONCRETES

Irfan PRASETIA¹,鳥居 和之² (1.Kanazawa University)

キーワード：透過拡散試験,リチウム及びナトリウム化合物,拡散係数,ASR抑制

The ionic diffusivity of lithium and sodium compounds was investigated by diffusion cell test. The diffusion coefficients of Na+ ions were 10 times more than Li+ ions. This is an indication of lithium ions is better adsorbed into the hydration products compared with others, especially Li2SiO3. This finding is backed-up by results of post-analysis such as DSC and XRD. The results of mortar bar tests were adding confidence to the mitigation effects of lithium on ASR of concrete. Expansions only observed for mortar bars immersed in sodium compounds solution, especially in 0.5 mol/L Na2SiO3.
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