CAJ | 학술논문

提出了钢管混凝土桁架梁式结构核心混凝土理想结构模型与自密实补偿收缩钢纤维钢管混凝土设计方法。通过确定复掺减缩型高效减水剂与高能膨胀剂合理掺量，有效补偿混凝土的收缩。钢纤维掺量不超过60 kg/m3（体积掺量0.75%）时能满足自密实混凝土技术要求。研究了钢纤维对微膨胀钢管混凝土力学性能与体积变形性能的影响规律；并根据钢管混凝土低温施工要求，研究了自密实补偿收缩钢纤维钢管混凝土的抗冻性设计方法，对其抗冻性进行了验证。试验结果表明，亚硝酸钠掺量0.4%时，现场养护核心混凝土试件与钢管混凝土短柱轴压与相应标准养护试件的轴压基本没有差异，混凝土抗冻效果良好，满足低温施工质量要求。
제출료강관혼응토항가량식결구핵심혼응토이상결구모형여자밀실보상수축강섬유강관혼응토설계방법。통과학정복참감축형고효감수제여고능팽창제합리참량，유효보상혼응토적수축。강섬유참량불초과60 kg/m3（체적참량0.75%）시능만족자밀실혼응토기술요구。연구료강섬유대미팽창강관혼응토역학성능여체적변형성능적영향규률；병근거강관혼응토저온시공요구，연구료자밀실보상수축강섬유강관혼응토적항동성설계방법，대기항동성진행료험증。시험결과표명，아초산납참량0.4%시，현장양호핵심혼응토시건여강관혼응토단주축압여상응표준양호시건적축압기본몰유차이，혼응토항동효과량호，만족저온시공질량요구。
It is mainly about that an ideal model of center concrete in the truss girder structure of steel tubing concrete and a method that used for limiting the shrinkage of the steel tubing concrete mixed with steel fiber.Through finding out the reasonable amount of highly ef-fective water and shrink reducer as well as the high-performance swelling agent ,we resolve the problem about the shrinkage in concrete. The amount of the steel fiber is limited less than 60 kg/m3,equal to 0.75%in volume measures,which can be satisfied with the demands to concrete.Also,we do a research about the rules of variable strength performance and cubic deformation property.Furthermore ,in order to meet the demand of engineering technique in cold condition,we have been discover a frost-resisting method that can be used for limiting the shrinkage of the steel tubing concrete mixed with steel fiber,and carefully verified its availability.The results of research showed that if the dosage of sodium nitrite was about 0.4%,and there was no difference between the strength of both short columns and its standard cur-ing samples under axial compression.Moreover,the frost-resisting performance of the concrete can be satisfied with the demands of con-structing quality in cold condition.