基于粉煤灰掺量的砂浆塑性收缩开裂本构关系的研究

Research on Influence of Fly Ash Admixture to the Constitutive Equation of Plastic Shrinkage Cracking of Cement Mortar

研究了粉煤灰掺量对于砂浆塑性收缩性能和塑性粘度的影响。试验表明,随着粉煤灰掺量的增加,砂浆抗裂指数增大,开裂所需时间增加,塑性粘度降低;建立了粉煤灰掺量与砂浆抗裂指数、开裂时间的本构关系,及掺加粉煤灰后砂浆塑性粘度与抗裂指数的本构关系。

The influence of fly ash admixture to plastic shrinkage cracking and plastic viscosity of cement mortar is studied. Results show that with the increase of fly ash admixture, both cracking-resistance index and time for cracking of cement mortar increase, and its plastic viscosity de- creases. The constitutive relations between content of fly ash and cracking-resistance index of cement mortar, content of fly ash and time for crack- ing of cement mortar, and plastic viscosity of cement mortar with fly ash and its cracking-resistance index have been built respectively.