Effect of Fibrillated Cellulose on Lime Pastes and Mortars

Materials

Chiara D’Erme¹  Maria Laura Santarelli¹  Walter Remo Caseri² 

[1] DICMA—Department of Chemical Engineering Materials and Environment, Sapienza Università di Roma, Via Eudossiana 18, 00184 Rome, Italy;Laboratory for Multifunctional Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8049 Zurich, Switzerland;

关键词: lime;    mortar;    fibre reinforced concrete;    natural fibres;    cellulose;   

DOI  :  10.3390/ma15020459

来源: DOAJ

【 摘 要 】

The use of nanocellulose in traditional lime-based mortars is a promising solution for green buildings in the frame of limiting the CO₂ emissions resulting from Portland Cement production. The influence of the fibrillated cellulose (FC) on lime pastes and lime-based mortars was studied incorporating FC at dosages of 0%, 0.1%, 0.2% and 0.3 wt% by weight of binder. The lime pastes were subjected to thermal and nitrogen gas sorption analyses to understand if FC affects the formation of hydraulic compounds and the mesoporosities volume and distribution. The setting and early hydration of the mortars were studied with isothermal calorimetry. The mechanical performances were investigated with compressive and three-point-bending tests. Furthermore, fragments resulting from the mechanical tests were microscopically studied to understand the reinforcement mechanism of the fibres. It was found that 0.3 wt% of FC enhances the flexural and compressive strengths respectively by 57% and 44% while the crack propagation after the material failure is not affected.

【 授权许可】

Unknown