摘要
负温环境下混凝土施工,若添加盐类防冻剂易导致混凝土后期强度降低、耐久性不足等问题。本文对比分析了正温养护、负温养护、正负温交替养护下不同掺量水化硅酸钙晶种对不同强度等级混凝土抗压强度的影响规律。结果表明:正温养护、负温养护下掺入晶种均可提高不同强度等级混凝土抗压强度,且混凝土强度等级越低抗压强度最大提升比例越高;负温养护下掺入晶种后抗压强度最大提升比例高于正温养护;正负温交替养护时混凝土抗压强度低于正温养护,且低强度等级混凝土抗压强度损失更大,掺入晶种可降低负温养护对混凝土造成的抗压强度损失,且高强度等级混凝土抗冻能力更强。
In the construction of concrete under negative temperature environment,if salt antifreeze is added,it is easy to reduce the strength and durability of concrete in the later stage.This paper compared and analyzed the influence of different content of hydrated calcium silicate crystal seed on the compressive strength of concrete with different strength grades under positive temperature curing,negative temperature curing and alternating positive and negative temperature curing.The results show that the compressive strength of concrete with different strength grades can be improved by adding crystal seeds under positive temperature curing and negative temperature curing,and the lower the concrete strength grade is,the higher the maximum increase proportion of compressive strength will be.The maximum increase proportion of compressive strength after adding crystal seed under negative temperature curing is higher than that under positive temperature curing.When the positive and negative temperature cures alternately,the compressive strength of concrete is lower than that of positive temperature curing,and the loss of compressive strength of low-strength concrete is greater.The addition of crystal seed can reduce the loss of compressive strength caused by negative temperature curing,and the frost resistance of high-strength concrete is stronger.
作者
郑新国
郁培云
段林锋
李书明
张驰
邓青山
ZHENG Xinguo;YU Peiyun;DUAN Linfeng;LI Shuming;ZHANG Chi;DENG Qingshan(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;State Key Laboratory for Track Technology of High-speed Railway,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;The Seventh Engineering Corporation of China Railway Engineering Corporation Shanghai Group,Shanghai 710061,China)
出处
《铁道建筑》
北大核心
2022年第4期150-153,共4页
Railway Engineering
关键词
工程材料
水化硅酸钙晶种
试验研究
混凝土
负温养护
早强作用
强度等级
抗压强度
engineering material
hydrated calcium silicate crystal seed
experimental study
concrete
negative temperature curing
early strength effect
strength grade
compressive strength
