DOI: 10.3724/SP.J.1249.2019.01061

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2019/36:1 PP.61-66

Characterization of basalt fiber doped concrete materials

Basalt fiber can effectively improve property of concrete material. However, there are some divergences for its effects on concrete property. Therefore, in this paper, the effects of various fiber contents and sizes on concrete strength and durability are investigated, and properties of chopped basalt fiber doped concrete materials are characterized. In the research, compressive strength and flexural strength are used as mechanical indexes, while resistance to chloride-ion penetration and early-age shrinkage are used as durability indexes. Results show that although the contribution of short-cut basalt fiber to compressive strength of concrete is not obvious, flexural strength of concrete increases significantly with the increase of the fiber content. When the volume fraction of basalt fiber reaches 0.12%, the flexural sstrength of concrete increases by about 25%. The basalt fiber with longer length and larger length/diameter ratio has better effect on the flexural strength of concrete. The addition of basalt fiber will make the concrete coagulate, thus the impermeability of concrete decreases slightly, but it can effectively reduce the shrinkage strain of concrete. By adding basalt fiber, shrinkage strain of concrete decreases by about 15% in 28 days.

Key words:building materials,concrete,basalt fiber,flexural strength,compressive strength,chloride-ion penetration

ReleaseDate:2019-01-28 09:56:35

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