基于中心粒子模型的超高性能水泥基材料水化进程模拟

The Hydration Model of Ultra-high Performance Cementitious Materials Based on the Shrinking-core Model

水泥基材料的水化进程关系着其微结构形成和性能演化。超高性能水泥基材料的组分和制备工艺特殊,其水化进程描述不同于普通混凝土材料。本工作基于中心粒子水化模型,结合高效减水剂、水胶比、硅灰掺量、温度等对水泥基材料水化进程的作用机制,提出不同因素的模型修正系数,建立超高性能水泥基材料的水化动力学模型;应用建立的模型对比分析了修正与未修正的水化进程,并与已有实验数据进行对比验证。结果表明,该模型可较好地模拟超高性能水泥基材料的水化进程。

The hydration process of cementitious materials play an important role in determining the material’s microstructure formation and properties.Compared to the normal concrete,the hydration process of ultra-high performance cementitious materials is different due to the special components and production process.Taking superplasticizers,water to binder ratios,silica fume and temperatures into consideration,the compensation factors were proposed and an improved kinetics hydration model was established based on the shrinking-core model.The modified and unmodified model was employed to study differences of the hydration process.The model predicting results were compared with the experimental results.Results show that the proposed model is capable of simulating the hydration process of ultra-high performance cementitious materials well.