High alkali-resistant basalt fiber for reinforcing concrete

[Display omitted] •Doping of basalt fiber with ZrSiO4 increased its alkali resistance.•Alkali treatment results in formation of protective surface layer on fibers.•Morphology and chemical composition of surface layer were investigated.•Mechanical properties of fibers were analyzed by a Weibull distr...

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Bibliographic Details
Published in:Materials in engineering 2015-05, Vol.73, p.60-66
Main Authors: Lipatov, Ya.V., Gutnikov, S.I., Manylov, M.S., Zhukovskaya, E.S., Lazoryak, B.I.
Format: Article
Language:English
Subjects:
Alkali resistance
AR-glass fiber
Basalt
Basalt fiber
Fiber reinforced concrete
Fibers
Glass
Morphology
Protective
Surface layer
Weight loss
Zirconia doping
Zirconium dioxide
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Summary:[Display omitted] •Doping of basalt fiber with ZrSiO4 increased its alkali resistance.•Alkali treatment results in formation of protective surface layer on fibers.•Morphology and chemical composition of surface layer were investigated.•Mechanical properties of fibers were analyzed by a Weibull distribution.•Zirconia doped basalt fibers demonstrate high performance in concrete. Basalt glasses and fibers with zirconia content in the range from 0 to 7wt% were obtained using ZrSiO4 as a zirconium source. Weight loss and tensile strength loss of fibers after refluxing in alkali solution were determined. Basalt fiber with 5.7wt% ZrO2 had the best alkali resistance properties. Alkali treatment results in formation of protective surface layer on fibers. Morphology and chemical composition of surface layer were investigated. It was shown that alkali resistance of zirconia doped basalt fibers is caused by insoluble compounds of Zr4+, Fe3+ and Mg2+ in corrosion layer. Mechanical properties of initial and leached fibers were evaluated by a Weibull distribution. The properties of basalt fibers with ZrSiO4 were compared with AR-glass fibers. The performance of concrete with obtained fibers was investigated.
ISSN:0261-3069
DOI:10.1016/j.matdes.2015.02.022