...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Cement and Concrete Research >Alteration of alkali reactive aggregates autoclaved in different alkali solutions and application to alkali-aggregate reaction in concrete (II) expansion and microstructure of concrete microbar
【24h】

Alteration of alkali reactive aggregates autoclaved in different alkali solutions and application to alkali-aggregate reaction in concrete (II) expansion and microstructure of concrete microbar

机译：不同碱溶液中高压灭菌的碱反应性骨料的改变及其在混凝土中的碱骨料反应中的应用（II）混凝土微棒的膨胀和微观结构

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The effect of the type of alkalis on the expansion behavior of concrete microbars containing typical aggregate with alkali-silica reactivity and alkali-carbonate reactivity was studied. The results verified that: (1) at the same molar concentration, sodium has the strongest contribution to expansion due to both ASR and ACR, followed by potassium and lithium; (2) sufficient LiOH can completely suppress expansion due to ASR whereas it can induce expansion due to ACR. It is possible to use the duplex effect of LiOH on ASR and ACR to clarify the ACR contribution when ASR and ACR may coexist. It has been shown that a small amount of dolomite in the fine-grained siliceous Spratt limestone, which has always been used as a reference aggregate for high alkali-silica reactivity, might dedolomitize in alkaline environment and contribute to the expansion. That is to say, Spratt limestone may exhibit both alkali-silica and alkali-carbonate reactivity, although alkali-silica reactivity is predominant. Microstructural study suggested that the mechanism in which lithium controls ASR expansion is mainly due to the favorable formation of lithium-containing less-expansive product around aggregate particles and the protection of the reactive aggregate from further attack by alkalis by the lithium-containing product layer.
机译：研究了碱类型对含有典型的具有碱-硅反应性和碱-碳酸盐反应性的骨料的混凝土微棒的膨胀性能的影响。结果证实：（1）在相同的摩尔浓度下，钠对膨胀的贡献最大，这归因于ASR和ACR，其次是钾和锂。 （2）足够的LiOH可以完全抑制由于ASR引起的膨胀，而可以引起由于ACR引起的膨胀。当ASR和ACR可以共存时，可以使用LiOH对ASR和ACR的双重作用来阐明ACR的贡献。业已表明，一直被用作高碱硅反应性的参考骨料的细粒硅质斯普拉特石灰石中的少量白云石可能会在碱性环境下脱去硅石并有助于膨胀。就是说，尽管主要是碱-硅反应性，但Spratt石灰石可以同时显示碱-硅反应性和碱-碳酸盐反应性。微观结构研究表明，锂控制ASR膨胀的机理主要是由于聚集体颗粒周围有利地形成了含锂的膨胀性较小的产物，以及保护了反应性聚集体免受含锂产物层进一步受到碱的侵蚀。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号