High temperature performance and microstructure of basalt fiber reinforced foam concrete
To investigate the influence of basalt fiber on the elevated temperature performance of foam concrete,the high-temperature test and quasi-static compression test were conducted on the different densities of foam concrete(FC)specimens and the basalt fiber reinforced foam concrete(BFC)with a fiber volume fraction of 0.3％.The temperature effect on the specimen appearance,mass loss rate,temperature rise curve at the center point,residual strength,and energy absorption performance of FC and BFC were investigated.Furthermore,CT scanning was carried out on the specimens before and after high temperature for 3D reconstruction,which facilitated the investigation of the change of pore size characteristics by the high temperature.The results showed that the fiber bridging effect could restrain the development of cracks and reduce mass loss after high temperatures.The added basalt fiber could extend the platform in the temperature rise curve,especially a significant effect on the extension of the platform at the target temperature of 600 ℃.Although the high temperature would degrade the mechanical performance and energy absorption capacity of FC and BFC,BFC still demonstrated a superior mechanical performance and energy absorption capacity compared to FC with the same density after high temperature.In addition,from the mesoscopic view,the results of 3D reconstruction showed that the addition of basalt fiber will increase the average pore diameter and the average pore wall thickness,resulting insuperior mechanical properties and energy absorption after high temperature.
foam concretebasalt fiberhigh temperature performancemechanical propertiesCT scanning
万方数据
维普
