抗压强度作为混凝土的一个重要指标,受到多种因素的影响.该文提出了一种使用EDEM软件的数值方法,通过考虑水泥水化程度随时间的变化来预测不同养护龄期的抗压强度.采用Hertze-Mindlin with bonding模型来描述硬化混凝土的本构关系.建立了水泥水化度与Hertze-Mindlin with bonding模型接触参数之间的函数关系,接触参数随着水泥水化度的增加而增加,抗压强度随养护时间的增加而提高,水灰比越大抗压强度越低,将不同龄期的C25、C30和C35的模拟抗压强度与试验值进行了比较.抗压强度相对误差均在8％以内,验证了预测模型的有效性,表明该方法可以对不同龄期的混凝土进行数值预测,为准确预测混凝土抗压强度提供了一种可靠的方法.
Numerical prediction of concrete compressive strength considering hydration degree
Compressive strength,as an important value of concrete,is affected by many factors.In this pa-per,a numerical method using EDEM software is proposed to predict the compressive strength at different curing age by considering the degree of cement hydration changing with time.The Hertze-Mindlin with bonding model is used to describe the constitutive relationship of hardened concrete.The parameters in the Hertze-Mindlin with bonding model is established as a function of cement hydration.With advance of ce-ment hydration,the compressive strength increases with curing time.The numerical compressive strengths of C25,C30 and C35 at different age are compared with the experimental values.The relative errors are all within 8％,verifying the validity of the prediction model.The concrete at different age can be numerically predicted.It provides a reliable method to accurately predict the compressive strength of concrete.
discrete element methodcement hydrationconcretecompressive strength
万方数据
维普
