Cement, being the most widely used building material, is the responsible for a large share of greenhouse gas emissions. To reduce the environmental impact of its production, natural fibres can be used as eco-friendly additives. Moreover, their potential use in traditional lime-based mortars makes them an ideal choice for green building as well as for the retrofit of historical buildings. An innovative cementitious composite reinforced with micro and/or nanofibrillated cellulose (hereafter called bioconcrete) was tested to assess its mechanical and physical properties. Samples were casted using Portland cement and Natural Hydraulic lime and varying the ratios among the constituents. Viscosity and setting time of the fresh pastes were determined with a Viscosimeter and a Vicat apparatus, while their hydration was studied by thermal analysis. The influence of the fibres on the flexural strength of the final composite was determined through mechanical tests. Preliminary analyses showed that fibres can promote the binder hydration, though at higher percentages they can negatively affect the workability/setting time of the fresh pastes and the flexural strength of the bioconcrete. The hygrothermal properties of the bioconcrete will be determined through an experimental campaign planned in 2021. The expected performance of thebioconcrete will be studied through dynamic hygrothermal simulations using the software IDA ICE (Indoor Climate and Energy) extended with the HMWall (Heat and Moisture) model. Since the reliability of the simulation results depends on the accuracy of the parameters used, it is pivotal to limit themain uncertainties of the upcoming hygrothermal measurements. Asensitivity analysis,based on the hygrothermal data of similar natural-based building materials available in literature, was conductedto identify the hygrothermal parameters influencing more the simulation of temperature and moisture gradients across a single layer of the bioconcrete.
Preliminary study of the mechanical and hygrothermal performance of concrete reinforced with nanofibrillated cellulose / D’Erme, Chiara; Verticchio, E.; Frasca, F.; Caseri, W.; Cornaro, C.; Siani, A.; Santarelli, M. L.. - (2020). (Intervento presentato al convegno Nanoinnovation tenutosi a Roma).
Preliminary study of the mechanical and hygrothermal performance of concrete reinforced with nanofibrillated cellulose
D’Erme Chiara
;Verticchio E.
;Frasca F.;Siani A.;Santarelli M. L.
2020
Abstract
Cement, being the most widely used building material, is the responsible for a large share of greenhouse gas emissions. To reduce the environmental impact of its production, natural fibres can be used as eco-friendly additives. Moreover, their potential use in traditional lime-based mortars makes them an ideal choice for green building as well as for the retrofit of historical buildings. An innovative cementitious composite reinforced with micro and/or nanofibrillated cellulose (hereafter called bioconcrete) was tested to assess its mechanical and physical properties. Samples were casted using Portland cement and Natural Hydraulic lime and varying the ratios among the constituents. Viscosity and setting time of the fresh pastes were determined with a Viscosimeter and a Vicat apparatus, while their hydration was studied by thermal analysis. The influence of the fibres on the flexural strength of the final composite was determined through mechanical tests. Preliminary analyses showed that fibres can promote the binder hydration, though at higher percentages they can negatively affect the workability/setting time of the fresh pastes and the flexural strength of the bioconcrete. The hygrothermal properties of the bioconcrete will be determined through an experimental campaign planned in 2021. The expected performance of thebioconcrete will be studied through dynamic hygrothermal simulations using the software IDA ICE (Indoor Climate and Energy) extended with the HMWall (Heat and Moisture) model. Since the reliability of the simulation results depends on the accuracy of the parameters used, it is pivotal to limit themain uncertainties of the upcoming hygrothermal measurements. Asensitivity analysis,based on the hygrothermal data of similar natural-based building materials available in literature, was conductedto identify the hygrothermal parameters influencing more the simulation of temperature and moisture gradients across a single layer of the bioconcrete.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
