几种水泥基材料的渗透率及其超临界碳化的应用

孔隙度和渗透率是水泥基等多孔材料的重要指标,是水泥基材料内部离子迁移多物理场耦合预测模型中的关键材料参数。针对水泥基材料超亚临界碳化预测模型的质量控制方程,采用稳态法试验分析得到了液体渗透率、氮气渗透率、固有渗透率,采用体积法得到了材料孔隙度和含水饱和度,试件包括水泥砂浆、混凝土、水泥瓦、纤维水泥板等材料。其中水泥砂浆和混凝土材料固有渗透率分别为0.001mD和0.0001mD数量级,其他试件为0.01mD数量级;而混凝土的固有渗透率最低为9e-4mD。木纤维等纤维材料的掺加,将大幅增加材料的孔隙度和渗透率。最后使用得到的各项渗透率、孔隙度、含水饱和度,对水泥砂浆和水泥瓦的超亚临界碳化试验进行了多物理场耦合模拟,模拟结果与试验吻合较好。

Permeability of some cement-based materials and usein the supercritical carbonization

T he porosity and intrinsic permeability of the cement‐based materials are significant parameters for the multiphysics coupling model for predicting the ions migration in the material .Based on the mass control equation ,the super subcritical carbonation model of cement‐based material ,the liquid permeability , gas permeability and intrinsic permeability were detected by the steady‐state method ,and the porosity and water saturation were detected by the volumetric method using materials of mortar ,concrete ,cement tile and two kind cement slabs .The results showed that the orders of magnitude of intrinsic permeability of mortar and concrete were 0.001mD and 0.0001mD respectively ,and the others were 0.01mD .Especially , the concrete intrinsic permeability was 9e‐4mD and the porosity and the permeability would increase ,when the material hadwood fiber component . Finally ,some super subcritical carbonation tests were simulated using the values of the parameters obtained ,and it was consistent with the test results of the carbonization depth .