基于细观力学模型水泥浆体弹性力学性质预测

Prediction of elastic properties of cement pastes using micromechanics

应用细观力学理论及三维微观水化模型,建立了水泥浆体的理想化细观力学模型.在该模型中:首先将水泥浆体中包裹着水化产物的未水化水泥颗粒视为第1层次的等效介质,利用双层夹杂自洽理论求出弹性性质;再将含水的孔洞视为嵌入在第1层次等效介质中的夹杂,利用自洽理论给出水泥浆体的最终弹性性质;最后分析了水泥浆体在不同水灰比情况下弹性性质随水化程度的演化进程.试验结果证明该模型可以较好地预测水泥浆体的弹性力学性质.

Based on the micromechanics theory and three dimensional microstructure model, a multiphase micromechanics model for cement pastes was proposed. First, the unhydrated clinker surroun- ded by hydrated products was taken as an equivalent medium, and self-consistent theory for double- layer inclusions was used to determine their elastic properties. And then, the holes containing water were treated as the inclusions embedded in above equivalent medium. Therefore, the elastic properties of cement pastes could be proposed by common self-consistent theory ultimately. The evolution of elastic properties of cement pastes with hydration was analyzed under the condition of different watercement ratio. Compared with the experimental results, this model is demonstrated a better prediction of the elastic properties of cement pastes.