摘要
为了评价粉煤灰和外加剂复掺对二次衬砌混凝土开裂的影响,通过正交试验分析得出UEA-H(膨胀剂)、FA(粉煤灰)、SRA(减缩剂)最佳复合掺量,采用改进圆环法快速测试二次衬砌混凝土的抗裂性能,研究UEA-H、FA、SRA最佳复合掺量对二次衬砌混凝土工作性能、力学性能和抗裂性能的影响。结果表明:UEA-H、FA、SRA最佳复合掺量提高了二次衬砌混凝土的工作性能和强度,对弹性模量影响较小;改善了石-骨料界面过渡区黏结度和二次衬砌混凝土内部孔结构,使混凝土结构更加致密;界面过渡区骨料黏结的强度提高,减少了微裂纹的产生和发展,降低了二次衬砌混凝土内部拉应力发展速率,延长了开裂时间,使干燥收缩降低了53.7%,抗裂性能提高了1.1倍。因此,复掺粉煤灰和外加剂显著提高了二次衬砌混凝土的抗裂性能。
In order to evaluate the hybrid of UEA-H(sweller),FA,SRA(shrinkage-reducing admixtures)on the improvement of secondary tunnel lining concrete complex crack resistance,The optimum mix ratio of materials were investigated the orthogonal experiment.The experimental results show that the hybrid effect of UEA-H/FA/SRA can increase secondary tunnel lining concrete workability and strength,have no significant effect in elastic modulus.Bond strength are enhanced in concrete interface transition zone and the microstructure are changed as well.The hybrid effect of UEA-H/FA/SRA reduced secondary tunnel lining concrete micro-cracking or the tensile stress,and cracking time of concretes extends.Also,the hybrid effect of UEA-H/FA/SRA reduces the secondary tunnel lining concrete drying shrinkage in 53.7%and anti cracking performance increased by 1.1 times.The results indicate that the hybrid action of UEA-H,FA,SRA could improve the secondary tunnel lining concrete complex crack resistance.
作者
杨朋
杨飞
韩宁旭
韩玉梅
刘艳新
尹应梅
YANG Peng;YANG Fei;HAN Ningxu;HAN Yumei;LIU Yanxin;YIN Yingmei(School of Harbor Engineering,Guangzhou Maritime University,Guangzhou 510725,China;Han-shi Highway Management Office,Hubei Provincial Department of Transportation,Wuhan 430051,China;Guangdong Provincial Key Laboratory of Durability for Civil Engineering,Shenzhen University,Shenzhen 518060,China;School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China)
出处
《混凝土》
CAS
北大核心
2018年第9期119-122,151,共5页
Concrete
基金
2017年广东大学生创新培育专项资金项目(攀登计划项目pdjh2017b0386)
广东省滨海土木工程耐久性重点实验室开放基金项目(GDDCE17-3)
高等学校青年骨干教师国内访问学者项目(广东项目169号)
国家自然科学基金(51508109)
关键词
混凝土
寒旱地区
冲击回波法
无损检测
抗压强度
secondary lining
improvement ring test
strength
complex crack resistance
morphology
