CAJ | 학술논문

根据干海子大桥冬期混凝土施工要求和现场原材料特性，采用亚硝酸钠与乙二醇形成有机、无机协同防冻，设计制备出流动性好、包裹性佳、自密实的抗冻钢管混凝土。并通过现场实验，结合 SEM观测，研究了其在低温浇筑与养护、后期升温后强度的发展规律。结果表明，低温条件成型的钢管混凝土短柱与核心混凝土试件，早期强度发展较好，后期温度回升后强度能稳定增长。设计制备的钢管混凝土具有很好的低温工作性能和力学性能，抗冻性能优越，能满足依托工程冬季钢管混凝土施工质量要求。
근거간해자대교동기혼응토시공요구화현장원재료특성，채용아초산납여을이순형성유궤、무궤협동방동，설계제비출류동성호、포과성가、자밀실적항동강관혼응토。병통과현장실험，결합 SEM관측，연구료기재저온요축여양호、후기승온후강도적발전규률。결과표명，저온조건성형적강관혼응토단주여핵심혼응토시건，조기강도발전교호，후기온도회승후강도능은정증장。설계제비적강관혼응토구유흔호적저온공작성능화역학성능，항동성능우월，능만족의탁공정동계강관혼응토시공질량요구。
According to winter concrete construction requirements and raw materials properties of Ganhaizi bridge,sodium nitrite and ethylene glycol were used to form organic and inorganic coordination antifreeze,frost resistance core concrete with outstanding package,excellent fluidity and good self-compacting ability was pre-pared.The laws of later strength evolution of concrete filled steel tube which pouring and maintenance at low temperature were investigated.Scanning electron microscope (SEM)was used to analyze the micro-morphology features of core concrete.It was confirmed that core concrete and concrete filled steel tube short column which manufactured at the low-temperature have a high early strength,and the later strength would steady grow when the temperature rise.The concrete prepared have prominent working performance and mechanical properties at low temperature,and good frost resistance,which would meet the winter concrete construction requirements of Ganhaizi bridge.