论文部分内容阅读
粉煤灰对高强混凝土收缩徐变的影响直接关系到结构长期性能的合理确定。制作粉煤灰掺量分别为0、12%和24%的100mm×100mm×400mm的C50混凝土棱柱体试件,在试验室条件下进行收缩及不同加载龄期的徐变试验,研究了粉煤灰对高强混凝土收缩徐变的影响。根据试验结果评估了目前常用的4种相关规范公式对高强混凝土收缩徐变的适用性,并引入粉煤灰影响系数以综合反映粉煤灰掺量和加载龄期对高强混凝土收缩徐变的影响,根据试验结果和现有研究成果提出了其修正模型。分析结果表明,JTG D 62和GL 2000推荐的收缩徐变预测模式与基准试件实测结果较为吻合,验证结论亦说明所引入的粉煤灰影响系数可应用于掺粉煤灰高强混凝土的收缩徐变预测。
The influence of fly ash on the shrinkage and creep of high strength concrete is directly related to the reasonable determination of the long-term performance of the structure. The C50 concrete prismatic specimens of 100mm × 100mm × 400mm with the content of fly ash of 0, 12% and 24% respectively were prepared and subjected to shrinkage tests and creep tests at different loading ages under laboratory conditions. Effect of Ash on Shrinkage and Creep of High Strength Concrete. According to the test results, the applicability of the four commonly used formula formulas to the shrinkage and creep of high strength concrete is evaluated, and the influence coefficient of fly ash is introduced to comprehensively reflect the effect of fly ash content and loading age on the shrinkage and creep of high strength concrete , According to the test results and the existing research results put forward its revised model. The analysis results show that the predicted shrinkage and creep prediction models proposed by JTG D 62 and GL 2000 are in good agreement with the actual measured results of the reference specimen. The verification results also show that the introduced influence coefficient of fly ash can be applied to shrinkage and creep of high-strength concrete with fly ash Change forecast.