• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Concrete Science and Engineering A Tribute to Arnon Bentur International RILEM Symposium; 20040324; Evanston,IL; US >PUMICE AGGREGATES FOR INTERNAL WATER CURING
【24h】

PUMICE AGGREGATES FOR INTERNAL WATER CURING

机译：浮石内部注水剂

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

A novel concept in internal curing of High Performance Concrete is based on dispersing very small, saturated lightweight aggregates (LWA) in the concrete, containing sufficient water to counteract self-desiccation. With this approach, the amount of water in the LWA can be minimized, thus economizing on the amount of the LWA. In this study, the pore structure of different size fractions of pumice aggregates was characterized by different techniques. The different size fractions show differences in porosity, sorption behavior, and pore-size distribution. The smaller size fractions have lower water absorption, but they release a greater percentage of their absorbed water at the equilibrium relative humidity of practical interest in early-age concrete, above 90%. Additionally, early-age properties of mortars with different contents of saturated pumice were investigated: a reference mix without pumice and mixes with 4% and 8% pumice by volume of mortar. By addition of pumice, mortars with improved strength, enhanced degree of hydration and reduced autogenous shrinkage were obtained. An important obstacle to the application of this kind of pumice for actual concrete production is saturation of the particles, which can be achieved only by immersion in boiling water or by vacuum saturation.
机译：高性能混凝土内部固化的新概念是基于将非常小的饱和轻质骨料（LWA）分散在混凝土中，其中包含足以抵消自干性的水。通过这种方法，LWA中的水量可以最小化，从而节省了LWA的量。在这项研究中，通过不同的技术表征了不同大小的浮石聚集体的孔结构。不同的尺寸分数显示出孔隙率，吸附行为和孔径分布的差异。较小尺寸的馏分的吸水率较低，但在早熟混凝土中实际实用的平衡相对湿度（大于90％）下，它们会释放出较大比例的吸收水。另外，研究了具有不同含量的饱和浮石的灰浆的早期性能：无浮石的参考混合物以及按灰浆体积计分别有4％和8％的浮石的混合物。通过添加浮石，获得了具有改善的强度，增强的水合度和减少的自生收缩的灰浆。将这种浮石应用于实际混凝土生产的一个重要障碍是颗粒的饱和，这只能通过浸入沸水或通过真空饱和来实现。

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