西北水电Issue(6)：37-42,6.DOI:10.3969/j.issn.1006-2610.2023.06.007
人工砂中游离云母含量对碾压混凝土性能的影响研究
Study on the Influence of Free Mica Content in Artificial Sand on the Performance of Roller Compacted Concrete
曹郎郎 1包想军 2陈书军 2陈双蛮 2闵永涛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 710065
- 2. 中国水利水电第三工程局有限公司,西安 710024
- 折叠
摘要
Abstract
Four types of artificial sand with different free mica contents are used to make roller compacted concrete,and the influence of free mica content on the VCvalue,mechanical properties,durability,and dry shrinkage deformation performance of roller compacted con-crete is studied.The results show that as the free mica content in artificial sand increases,the VCvalue of the RCC mixture significantly increases,and the working performance decreases.The higher the mica content,the more significant the impact.When the mica content increases from 0%to 8.7%,the VCvalue increases from 4.5 seconds to 9.3 seconds;the compressive strength,axial tensile strength,and static elastic modulus all decrease with the increase of mica content,and the higher the mica content,the greater the strength reduc-tion rate.The strength reduction rate at late stage is greater than the early stage,and the axial tensile strength reduction rate is slightly greater than the compressive strength.The frost resistance of concrete gradually decreases with the increase of mica content.When the mica content is not more than 3.9%,the frost resistance of concrete can still meet the requirement of Grade F200.When the mica con-tent reaches 8.7%,the frost resistance performance shows significant deterioration;the anti-permeability performance generally decrea-ses with the increase of mica content,but the impact is relatively small.All four groups of roller compacted concrete with different mica content can meet the requirements of W6 anti-permeability grade;the mica content has little effect on the dry shrinkage deformation per-formance of roller compacted concrete.关键词
游离云母含量/碾压混凝土/VC值/力学性能/耐久性能/变形性能Key words
free mica content/roller compacted concrete/VC value/mechanical properties/durability performance/deformation performance分类
水利科学引用本文复制引用
曹郎郎,包想军,陈书军,陈双蛮,闵永涛..人工砂中游离云母含量对碾压混凝土性能的影响研究[J].西北水电,2023,(6):37-42,6.
