硅灰调控混凝土力学性能的关键界面参数研究

Key Interface Parameters for the Control of Silica Fume on Mechanical Properties of Concrete

研究了硅灰分别掺加到混凝土基相和界面中对混凝土界面特征及力学性能的影响,并通过界面调控对混凝土力学性能进行优化,提出了调控混凝土力学性能的关键界面参数——界面区域硅灰质量浓度G.结果表明:界面中的硅灰在提高混凝土强度的同时,降低了混凝土脆性,在掺量较低时对混凝土强度的促进作用远大于基相中的硅灰;参数G能够统一基相和界面中的硅灰作用效果,建立硅灰界面强度的关联关系,具有重要的应用价值.

The effect of silica fume added to basic phase and interface on the interface characteristics and mechanical properties of concrete was studied.Further optimization of mechanical properties of concrete through interface control was also investigated.A key interface parameter for the control on mechanical properties of concrete—G(interface silica fume mass concentration)was proposed.The results show that silica fume added to the interface can significantly improve the mechanical properties of concrete,the promotion of concrete strength is much greater than that of silica fume added in basic phase at lower dosage,can also improve strength and reduce brittleness of concrete at the same time.The parameter G can be used to unify the properties of silica fume in the basic phase and interface,and establish the relationship of silica fume-interface-strength,which will be of great application value.