Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 309, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.125103
Keywords
Basalt fibers; Surface treatments; Cement matrix; Interphases
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Funding
- Ministerio de Economia y Competitividad [MAT2014-59116-C2]
- Fondos de Investigacion de Fco. Javier GonzalezBenito, politica de reinversion de costes generales, Universidad Carlos III de Madrid [2012/00130/004]
- Project Bando per il Finanziamento di Progetti di Ricerca Congiunti per la Mobilit`a all'Estero di Studenti di Dottorato [0051266]
- Accion Estrategica en Materiales Compuestos Polimericos e Interfases, Universidad Carlos III de Madrid [2011/00287/002]
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Through studying the effects of different surface treatments of basalt fibers on cement matrix, it was found that the mechanical properties of basalt fibers dispersed in cement matrix were significantly improved when the fibers were treated with a complex mixture of silanes.
In order to prepare basalt fibers-reinforced cement-based mortars with higher compatibility between reinforcement and matrix, basalt fibers with new surface treatments (sizing) were studied looking for enhanced interaction at the interphase between basalt fibers and cement matrix. As-received, calcinated, activated and silanized (by three silane aqueous solutions: i) gamma-aminopropyltriethoxysilane, APTES; ii) gamma-aminopropylmethyldiethoxysilane, APDES and iii) a mixture APTES + APDES 50% by weight) basalt fibers were dispersed in Portland cement matrix. Performances of the composites were evaluated by mechanical tests. Final correlation between the fibers surface characteristics and mechanical performance was carried out considering the induced microstructural changes and adhesion at the interface. Fractographic analysis by SEM and laser and optical profilometry were performed. A clear improvement in mechanical properties was obtained when basalt fibers were dispersed in cement matrix. Results suggest that better behavior is achieved when basalt fibers modified with a complex mixture of silanes are dispersed in cement matrix.
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