摘要
通过采集多个隧道的地下水和管道结晶样本,进行了微观和化学成分分析。建立了一个模拟隧道排水管道系统的实验装置,研究了不同粉煤灰掺量对混凝土的影响,包括实验溶液的总碱度、管道结晶质量和微观形态。研究发现,隧道结晶样本主要由高纯度碳酸钙组成,镁元素的含量影响结晶形状,高镁含量导致不规则结晶,低镁含量则形成更稳定的斜六方晶系结晶。实验中,当粉煤灰掺量增加,实验溶液的总碱度上升,结晶累积量呈先降低后升高的变化趋势;10%掺量组的结晶累积速度最快,15%掺量组的最慢,两者累积量差距显著。实验装置中结晶物的微观形态与样本相似,主要为斜六方晶系的方解石碳酸钙晶体,粉煤灰掺量对结晶物微观形貌和表面特征无显著影响。
In this study,groundwater and crystallization samples in drainage pipe from multiple tunnels were collected,and microscopic and chemical composition analysis were conducted.An experimental setup was established to simulate the tunnel drainage pipe system.The impacts of different amount of fly ash dosage on concrete were studied,including the total alkalinity of the test solution,the quality and the microstructure of pipe crystallization.It was found that the tunnel crystallization samples were primarily composed of high-purity calcium carbonate,and the content of magnesium affected the shape of the crystallization.High magnesium content resulted in irregular crystallization,while low magnesium content resulted in more stable rhombohedral crystallization.In the experiment,as the dosage of fly ash increased,the total alkalinity rose in the solution,and the accumulation of crystallization initially decreased and then increased.The experimental group with a 10%fly ash dosage exhibited the fastest rate of crystallization accumulation,while the experimental group with a 15%dosage showed the slowest,with a significant difference between them in terms of accumulation amount.The microstructure morphology of the crystallization from the experimental setup was similar to that of the samples,mainly consisting of rhombohedral calcite crystals of calcium carbonate.The fly ash dosage had no significant impact on the microstructure morphology and surface features of the crystallization.
作者
鞠作斌
吕建兵
JU Zuobin;LYU Jianbing(Guangdong Hualu Transport Technology Co.Ltd,Guangzhou Guangdong 510420,China;Guangdong University of Technology,School of Civil and Transportation Engineering,Guangzhou Guangdong 510006,China)
出处
《广东公路交通》
2024年第4期55-60,共6页
Guangdong Highway Communications
关键词
隧道
排水管道结晶
碳酸钙
室内模型实验
混凝土粉煤灰
tunnels
crystallization in drainage pipes
calcium carbonate
indoor model tests
fly ash concrete
