Fluidity and Mechanical Properties of Basalt Fiber Reinforced Cement Mortar at Different Mixing Ratios

Abstract:

To investigate the fluidity and mechanical properties of basalt fiber reinforced cement mortar （BFRCM） at different mixing ratios， the mixing ratio of BFRCM was adjusted by changing the water-cement ratio， the contents of water reducers， and the mixing ratios of long and short fibers. Fourteen groups of BFRCM samples were prepared by using 2 kinds of fiber aspect ratios， 7 kinds of basalt fiber volume dosages， 3 kinds of water-cement ratios， and 3 dosages of water-reducing agents. The fluidity， compressive strength， and flexural strength of the BFRCM at different mix ratios were analyzed， the load-displacement curve of the BFRCM after peak load was normalized， and the fracture toughness of the BFRCM after specimen fracture was quantitatively analyzed. The results show that the fluidity of the BFRCM decreases with increasing basalt fiber content， decreasing water-cement ratio， decreasing water reducer， and increasing short fiber proportion. The increase in the water-cement ratio has little effect on the compressive strength of the BFRCM but reduces its flexural strength. The application of the water-reducing agent has a certain negative impact on the compressive and flexural strength of the BFRCM. The blending of long and short basalt fibers can effectively improve the compressive and flexural strength of the BFRCM through its synergistic effect， but too much short fibers can weaken the strengthening effect of basalt fibers on the BFRCM. Increasing the content of basalt fiber and the water-cement ratio can improve the fracture toughness of the BFRCM after peak load within a certain range. However， the increase in short fiber ratios and the application of water-reducing agents negatively affect the fracture toughness of the BFRCM after peak load.

Key words:basalt fiber reinforced cement mortar (BFRCM);fluidity;mechanical properties;fiber synergistic effect