混凝土收缩的MC2010模型

摘要

当今高强混凝土早期开裂问题突出,收缩是引起开裂的主要原因之一.高强混凝土收缩与普通混凝土收缩有着本质的区别.高强混凝土的水灰比小、活性掺入物多,自收缩较大甚至超过了干燥收缩.随着水灰比的减小,混凝土干燥收缩减小,自收缩增大.混凝土收缩的MC2010模型对之前的MC1990进行了较大修正,将收缩表示为干燥收缩和自收缩的和形式,给出了自收缩的计算表达式.%At present,the cracking problem of high strength concrete is prominent and shrinkage is one of the main causes of cracking. The shrinkage of high-strength concrete is essentially different from that of ordinary concrete.The water cement ratio of high-strength concrete is small,the activity is mixed with many,since shrinkage is larger or even more than dry shrinkage.With the decrease of water cement ratio,the shrinkage of drying decreased and the autogenous shrinkage increased.The MC2010 model of concrete shrinkage has been modified for the previous MC1990,and the shrinkage is expressed as drying shrinkage and autogenous shrinkage and the expression of autogenous shrinkage is given.