Influence of basalt fiber on frost properties of concrete with coal gangue ceramsite as coarse aggregates
In order to promote the resource utilization of the coal gangue in cold regions,the frost resistance of the concrete with coal gangue ceramsite as coarse aggregates was investigated and the basalt fiber influence on the performance of the coal gangue ceramsite concrete in cold re-gions was verified.Four types of concrete were prepared,with fiber volume content of 0％,0.1％,0.2％and 0.3％,respectively.The rapid freeze-thaw test was adopted for the experi-ment,the fractal dimension was introduced to verify the variation of the surface topography of the samples;the indexes of the residual dynamic modulus of elasticity of the samples were compared,respectively.The capillary water absorption experiment was also conducted after different freeze-thaw cycles.The amount of absorbed water and the water absorption coefficient of the samples were studied.The results show that the addition of basalt fiber can significantly enhance the frost resistance of coal gangue ceramsite concrete.The surface scaling of the matrix is delayed with the dosage of basalt fiber and the surface topography of coal gangue ceramsite concrete can be charac-terized quantitatively by introducing the factor of fractal dimension.The loss rate of the residual dynamic modulus of elasticity of the matrix is slowed down with the increment of fiber content.Af-ter the frost action,the capillary water absorption capacity of the matrix is significantly improved,while under the same freeze-thaw cycles,the capillary water absorption capacity of the matrix de-creases with the increase of basalt fiber dosage.
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