摘要
研究纤维膨胀剂对不同水胶比和不同强度等级混凝土工作性能、抗压强度和变形性能的影响。结果表明,相同水胶比条件下,纤维膨胀剂掺量对混凝土拌合物坍落度无明显影响;纤维膨胀剂掺量是影响混凝土限制膨胀率的主要因素,纤维膨胀剂掺量由7%增加至11%能更有效地补偿收缩;但纤维膨胀剂掺量增加,在提高补偿收缩能力的同时,也会降低混凝土抗压强度。综合考虑纤维膨胀剂对混凝土抗压强度和限制膨胀率的影响后,确定C30、C40强度等级的隧道衬砌膨胀混凝土配合比,经验证该配合比下混凝土工作性能良好、满足强度设计要求,且均有良好的早期抗裂性能。
In this study,the effect of fiber expansion agents on the working performance,compressive strength and deformation properties of concrete with different water-cement ratios and strength grades was investigated.The results of the study indicate that,for a given water-cement ratio,the variation in the content of fiber expansion agent does not significantly affect the slump of the concrete mixture.Additionally,the content of fiber expansion agent is the main factor affecting the limited expansion rate of concrete.Increasing the amount of fiber expansion agent from 7%to 11%can effectively compensate for shrinkage.However,this increase also negatively impacts the compressive strength of the concrete.Taking into account the influence of fiber expansion agent on concrete compressive strength and limited expansion rate,the mix ratio of tunnel lining expansion concrete with C30 and C40 strength grades was determined.This mix ratio was found to meet the strength design requirements and provide good early crack resistance while maintaining good working performance.
作者
陈振光
缪闯波
张春英
张家奇
王琪
范同发
钱晓倩
CHEN Zhenguang;MIAO Chuangbo;ZHANG Chunying;ZHANG Jiaqi;WANG Qi;FAN Tongfa;QIAN Xiaoqian(Hangwen Project Construction Headquarters,China Railway Shanghai Group Co.Ltd.,Hangzhou 311215,China;Blooms Hangwen Railway Co.Ltd.,Hangzhou 311215,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处
《新型建筑材料》
2024年第6期42-46,共5页
New Building Materials
关键词
纤维膨胀剂
衬砌混凝土
坍落度
抗压强度
限制膨胀率
早期抗裂性
fiber expansion agent
tunnel lining concrete
slump
compressive strength
limited expansion rate
early crack resistance
