• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Radon Emanation from Concrete Surface and the Effect of the Curing Period, Pulverized Fuel Ash (PFA) Substitution and Age
【24h】

Radon Emanation from Concrete Surface and the Effect of the Curing Period, Pulverized Fuel Ash (PFA) Substitution and Age

机译：混凝土表面的气散发及其对养护期，粉煤灰（PFA）替代和年龄的影响

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

Radon emanation rates from 48 concrete blocks have been monitored throughout a period in excess of 1 yr. These blocks have been produced for three distinct mixes of materials, i.e. mix A with 25% by weight substitution of type A pulverized fuel ash (PFA), mix B with 25% by weight substitution of type B PFA and mix C without PFA. Each mix is represented by four sets o1' concrete blocks with curing periods of 1, 3, 7 and 28 days. Every set comprises of four blocks each with the same composition and curing period. From the results, rates of change of radon emanation have been identified for two distinct periods, i.e. for the first month following curing and for the period following the first month. The different emanation rates are linked to the role of the superficial and inner pores of the concrete, It is also seen that the radon emanation rate tends to decrease with the age of the blocks for curing periods of 1. '3 and 7 days, but tends to increase for a curing period of 28 days, all of which can be rationalized in terms of the gradual dehydration of concrete as it ages. The patterns are similar for the different mixes, although the exact effect of PFA upon radon emanation rates remains unresolved, # 1997 Elsevier Science Ltd
机译：在超过1年的时间内，对48个混凝土砌块的释放率进行了监测。这些块是针对三种不同的材料混合物生产的，即混合物A具有25％重量替代的A型粉煤灰（PFA），混合物B具有25％重量替代的B型PFA和混合物C没有PFA。每种混合物由四组o1'混凝土块代表，固化时间分别为1、3、7和28天。每组包括四个嵌段，每个嵌段具有相同的组成和固化时间。从结果可以确定两个不同时期的ra散发变化率，即固化后的第一个月和第一个月后的时期。不同的散发速率与混凝土的表层和内部孔隙的作用有关。还可以看出，随着固化时间为1.'3和7天，the的散发速率会随着砖块的老化而降低。往往会增加28天的固化时间，所有这些都可以根据混凝土随着时间的推移逐渐脱水而合理化。对于不同的混合物，其模式相似，尽管PFA对ra释放率的确切影响仍未解决，＃1997 Elsevier Science Ltd

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