Damage characteristics of basalt fiber foamed concrete in freeze-thaw environment
To investigate the damage characteristics of basalt fiber foamed concrete in freeze-thaw environ-ment,four kinds of foam concrete with fiber volume fractions of 0,0.15％,0.30％and0.45％were subjec-ted to freeze-thaw cycle tests for 0,20,40,60 and 80 times,respectively.The damage evolution law,frac-ture types and crack development characteristics of foamed concrete were studied by the uniaxial compression-acoustic emission combined device.The results show that there are obvious stages in the compression process of foam concrete.Freeze-thaw cycles deteriorate the mechanical properties of foamed concrete.After 80 freeze-thaw cycles,the peak compressive strengths of four specimens with the fiber volume fractions of 0,0.15％,0.30％and 0.45％decrease by 65.0％,54.4％,24.4％and 36.1％,respectively.Freeze-thaw cycle can reduce the activity of acoustic emission,promote the transformation of tensile cracks to shear cracks in foam concrete,and accelerate the expansion of internal pores and cracks in concrete.The addition of basalt fiber can reduce the internal damage of foamed concrete,promote the generation of tensile cracks,effectively inhibit the development of large-scale cracks,and improve mechanical properties.
万方数据
维普
