Microstructure and moisture transport in carbonated cement-based materials incorporating cellulose nanofibrils

نویسندگان

چکیده

Carbonation of cement-based materials may lead to durability problems, so that it is necessary find a way reduce the effect carbonation on concrete durability. This study investigated effects cellulose nanofibrils (CNFs) carbonated materials. Two dosages CNFs were used prepare cement pastes and mortars. Before after accelerated (4 % CO 2 concentration 57 relative humidity), their microstructure, mineralogical composition, moisture retention capacity, drying kinetics, water absorption measured. Results show contents hydration products (CH, C-S-H, ettringite) slightly decrease with increase dosage. After carbonation, ratios dosage more remain in The calcite content was found which help transformation other metastable calcium carbonates calcite. coarsening pore structure clearly observed measured size distribution for all materials, while our results this weakened by CNFs. Moisture transport but acceleration rate diminished increasing CNFs, suggesting are able microstructural damage carbonation.

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ژورنال

عنوان ژورنال: Cement and Concrete Research

سال: 2022

ISSN: ['0008-8846', '1873-3948']

DOI: https://doi.org/10.1016/j.cemconres.2022.106990