人工砂游离云母含量对混凝土性能的影响
Effect of Free Mica Content of Artificial Sand on Concrete Performance
吴文博 1贺晶晶 1王海婷 1赵坤龙 1樊李浩1
作者信息
- 1. 中国电建集团西北勘测设计研究院有限公司,西安 710199
- 折叠
摘要
云母含量影响着许多地区机制砂应用,由于目前云母含量对混凝土性能的影响研究不够完善,考虑到工程安全问题,国内标准对机制砂中云母含量的限制过于保守,导致许多水电工程中高云母含量人工骨料无法使用.为了使高云母含量的机制砂得到广泛应用,使用高云母含量原岩轧制的人工砂,通过外掺游离云母的方式,研究人工砂中不同游离云母含量对混凝土力学性能、拉伸性能、抗冻性能、抗渗性能的影响.由试验结果可以得出:云母含量对混凝土抗压强度、劈拉强度、抗渗性能影响较小,随着云母含量增加,混凝土单位用水量增加,轴拉强度和极限拉伸值略有降低,抗冻性能变差.
Abstract
The mica content of artificial sand affects its use in many areas.Present researches on the correlation be-tween mica content and concrete performance are not comprehensive.Due to engineering safety considerations,the standards for mica content in artificial sand are overly conservative in China.As a result,artificial aggregates with high mica content are unsuitable for many hydropower projects.To promote the widespread use of artificial sand with high mica content,we propose to add free mica into artificial sand made from parent rock with high mica content.This study aims to investigate the effects of varying content of free mica in artificial sand on concrete performance.Test results demonstrate that mica content has minimal impact on the compressive strength,splitting tensile strength,and impermeability of concrete.However,as mica content increases,the unit water consumption of con-crete increases,the axial tensile strength and ultimate tensile value of concrete decrease slightly,and frost resist-ance degrades.
关键词
混凝土/力学性能/拉伸性能/抗冻性能/抗渗性能/云母含量/人工砂Key words
concrete/mechanical performance/tensile performance/frost resistance/impermeability/mica con-tent/artificial sand引用本文复制引用
基金项目
国家自然科学基金项目(5207090694)
出版年
2024
国家科技期刊平台
NSTL
万方数据