再生混凝土徐变度试验研究及模型预测

Experimental Study and Model Predictive of Recycled Aggregate Concrete Creep

通过试验,研究了再生骨料取代率、应力水平及矿渣掺和料对再生混凝土徐变度的影响规律。结果表明,再生粗骨料的掺加可降低再生混凝土的徐变度。随着再生细骨料的增加,徐变度总体表现为增加。随着应力水平的增加,徐变度增加。矿渣可明显降低再生混凝土徐变度。结合试验数据,根据模拟退火原理,建立约束优化模型,进行再生混凝土徐变度公式的参数识别,结果表明该方法编程简单,稳定性好,所得参数与试验数据吻合较好,计算精度较高,适用于类似问题的多参数识别。

The effective laws of the substituent rates of recycled aggregate, stress level and slag on creep degree of the recycled concrete （RC） were researched. The test results indicate that the recycled aggregate could reduce the creep degree of RC.Creep degree of the RC increases along with the quantities of recycled aggregate. Also, the increase of stress level leads to the tiny crack and increases creep degree of RC. The slag could decrease the creep degree. According to the test data, the paper based on simulated annealing principle and objective function identifies parameters of RC creep degree. This study verifies the merits of the approach in simple programming structure, good stability, high calculation rate and accuracy. It is recommended that the simulated annealing algorithm should be made use of parameters identification of the similar problems.