Micromechanics-based durability study of cellulose cement in flexure

摘要

A micromechanics-based durability model wasdeveloped to predict the flexural mechanical properties of thinsheet cementitious composites reinforce with refined andunrefined cellulose fibers when the composite was tested dry, wet,and accelerated (carbonation) aged. The model is based onfracture mechanics and directly links the changes in materialstructure resulting from environmental deterioration processes tocomposite flexural mechanical properties. The model was used asa tool to estimate quantitatively cellulose fiber-matrix interfacialmicroparameters that were too difficult to measureexperimentally. Reasonable agreement was found between modelpredictions and experimentally determined trends in compositeflexural mechanical properties and mode of cellulose fiber failure(pullout or rupture) as a function of environment. This supportsthe validity of the proposed micromechanical modeling parameters.