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| 摘要: |
| 研究了硅酸与KOH，NaOH以及LiOH反应后所形成产物的吸水能力，结果表明：KOH与硅酸反应后的产物的吸水能力最强，其次是NaOH，而LiOH与硅酸反应的产物的吸水能力最弱．通过SEM／EDS对比研究了硅质集料在LiOH，KOH，LiOH KOH介质中的膨胀行为，结果表明：LiOH—硅酸反应生成的结构致密的非膨胀性产物硅酸锂L-S-H包裹在未反应的集料周围，阻止了碱—硅酸反应的继续进行，而LiOH—硅酸反应过程本身不会引起膨胀；在LiOH存在时，硅酸与KOH反应后形成的K-S-H中的K^ 被Li^ 取代生成L—S—H，而L-S-H阻碍了碱—硅酸反应的继续进行，故LiOH能够抑制碱—硅酸反应发生膨胀． |
| 关键词: LiOH 膨胀行为 反应产物 SEM／EDS 对碱 吸水能力 NaOH KOH 硅质集料 对比研究 反应生成 反应过程 Li^＋ 硅酸锂 膨胀性 K^＋ 包裹 致密 制碱 |
| DOI： |
| 分类号:TQ637 TD774 |
| 基金项目: |
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| Influence of LiOH on the Expansive Behavior of Alkali-Silica Reaction Product |
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MEI Lai-bao TANG Ming-shu DENG Min
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| Abstract: |
| Water absorption rate of products of silica reaction with KOH, NaOH and LiOH was studied. Test results show that the water absorption rate of KOH-silica reaction products is the highest followed by NaOH-silica reaction products, the water absorption rate of LiOH-silica reaction products is the lowest. The expansion of siliceous aggregate was compared in different solutions such as LiOH, KOH, LiOH+KOH and the products were studied by SEM/EDS. The results show that LiOH-silica reaction gives rise to less-expansive lithium silicate L-S-H which is fine and close in texture and unreacted aggregate is wrapped up in new-formed lithium silicate and alkali-silica reaction is prevented. LiOH-silica reaction process itself does not lead to expansion. When there is LiOH, K-S-H produced by KOH-silica reaction is transformed into L-S-H because K~+ in K-S-H is replaced by Li~+, therefore LiOH can inhibit the expansion due to alkali-silica reaction. |
| Key words: siliceous aggregate,alkali-silica reaction,lithium hydroxide |
