基于微观力学的水泥净浆抗拉强度预测模型

Prediction Model of Tensile Strength of Cement Paste Based on Micromechanics

结构是决定材料性能的本质因素,水泥净浆的微观结构决定了其宏观力学性能。基于水泥净浆中微观尺度各组分的数量、性质以及微观结构力学的原理,利用微裂纹强度理论分析了水泥净浆中主要水化产物氢氧化钙晶体与水化硅酸钙凝胶的相互作用,建立了水泥净浆抗拉强度的理论预测模型。该预测模型反映了水泥浆体微观组分的形貌、结构和力学特性,符合水泥净浆的受力特征和破坏的机理。将现有文献的材料参数和试验过程作为模型的输入条件和参数,进行水泥净浆抗拉强度的计算。对比试验结果显示:两者具有较高的吻合度,验证了该预测模型的正确性。

Structure determines performance.The microstructure of cement paste determines its macroscopic mechanical properties.Based on the quantity,properties and the principle of microstructure mechanics of each component in the micro scale of cement paste,the interaction between calcium hydroxide and calcium hydroxide gel in cement paste was analyzed by microcrack strength theory,and a theoretical prediction model for tensile strength of cement paste was established.The prediction model reflected the morphology,structure and mechanical properties of the micro components of cement paste,which conforms to the mechanical characteristics and failure mechanism of cement paste.The material parameters and experiment process of the existing literature were taken as the input conditions and parameters of the model to calculate the tensile strength of cement paste.By comparison,the prediction results had a high degree of coincidence with the experiment results,which verifies the correctness of the prediction model.