An integrated modeling approach to determining internal relative humidity and degree of reaction of desiccating cementitious materials has been developed. By simultaneously accounting for both self-desiccation and external drying, the model is capable of predicting the evolution of material properties of desiccating cementitious materials. Using the mass loss data of the prism specimens, the moisture diffusion coefficient of a nonlinear model for cement mortar was determined. Additionally, a previous poroviscoelastic shrinkage model was modified and extended. Through comparison of predicted and measured axial strain of the prism specimens, the viscoelastic compliance of cement mortar was extracted. The present work revealed that it is possible to use a simple drying prism test to fit the moisture diffusion coefficient and creep compliance of cementitious materials, though the comparison of the extracted viscoelastic compliance with measured compliance was only reasonable if the outer layer of the drying mortar was presumed to have microcracking.

已开发出一种用于确定干燥胶结材料的内部相对湿度和反应程度的综合建模方法。通过同时考虑自干燥和外部干燥，该模型能够预测干燥胶结材料的材料特性的演变。使用棱柱试样的质量损失数据，确定了水泥砂浆非线性模型的水分扩散系数。此外，修改和扩展了先前的多孔粘弹性收缩模型。通过对棱柱试件的预测轴向应变和实测轴向应变的比较，提取了水泥砂浆的粘弹性柔量。