Study of the effect of silica fume and latex dosages in cementitious composites reinforced with cellulose fibers

• Published in: Journal of Building Engineering Vol. 31; p. 101442
• Main Authors: Carvalho Machado, Paulo Júnior, Ferreira, Rondinele Alberto dos Reis, Aparecida de Castro Motta, Leila
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.09.2020
• Subjects: Cementitious composites; Mechanical properties; Mineral addition; Optimization; Response surface methodology; Mechanical properties; Response surface methodology; Cementitious composites; Optimization; Mineral addition
• ISSN: 2352-7102; 2352-7102
• DOI: 10.1016/j.jobe.2020.101442

The aim of this work was to investigate the effect and the relationship between the silica fume, eucalyptus pulp, and natural rubber latex in the durability of fiber cement after natural aging (180 days) and the reduction of matrix attack to cellulosic fibers. Results showed that after aging at 180 days of the composites, the main compound responsible for increasing matrix densification was the presence of calcite. The variable cellulose significantly influenced (p < 0.05) the reduction of modulus of elasticity, as well as the variable natural rubber latex, which significantly influenced the reduction of the modulus of rupture, modulus of elasticity and absorption after aging at 180 days. The optimized composite was the composite of the validation, which has 13.55% of silica fume, 14.94% of cellulose and 1.40% of natural rubber latex. •After natural aging for 180 days, cellulose fiber was preserved.•The presence of calcite caused an increase in matrix densification after 180 days.•The distribution of silica fume influenced porosity in composites.•Interaction between the variables increased the durability of the composites.