Calculation and analysis of effective elastic modulus of hollow glass microspheres low density cement
Hollow glass microspheres low-density cement is a typical multiphase and multilevel heterogeneous composite material with high water-cement ratio,low cementing phase and many dopants.Its macroscopic mechanical properties at the elastic stage are determined by its composition and structure at the meso-,micro-and even nano-scales.In order to explore the effect of material meso-and micro-structure on macro-mechanical properties,a multi-scale homogenization theoretical model of elastic modulus of microspheres-low-density cement considering the interaction between interface and microspheres was established under framework of meso-and micro-mechanics based on Mori-Tanaka method,self-consistent method and four-phase model.Based on the experimental results,the influencing factors were expanded and analyzed.The results show that the longer the curing age of cement,the higher the elastic modulus,but with the increase of time,the increasing trend of elastic modulus will gradually slow down and tend to be stable by the time of 28 days.The thickness of interfacial transition zone(ITZ)is an important influence factor of the elastic modulus of cement,and the increase of thickness will greatly reduce the elastic modulus of cement.The density and elastic modulus of microspheres affect the elastic modulus of cement together.
low density cementhollow glass microsphereselastic modulusmulti-scalehomogenization
万方数据
维普
