Experimental Study on Basic Mechanical Properties of SiO2 Modified Basalt Fiber Concrete

Abstract

The tensile performance of concrete is not good. In order to explore the improvement effect of highly active Nano-SiO2 (NS) particles on the basic mechanical properties of Basalt fiber (BF) concrete. BF particles with high cost performance and NS particles with high activity were added into concrete in the way of single and mixed, respectively. The compression and splitting tensile test were performed, and the microstructure and failure mechanism of concrete were analyzed by electron microscopic experiment. The results show that the increase rate of compressive strength and splitting tensile strength of BF doped concrete is up to 4.31% and 13.41% respectively. The increase rate of compressive strength and splitting tensile strength of single-doped NS concrete is up to 8.9% and 5.43% respectively. The maximum increase rate of compressive strength and splitting tensile strength of BF and NS concrete is 16.29% and 23.91%, respectively. According to the results of microscopic microscopy, the mixing of BF and NS can greatly improve the mechanical properties of the foundation, because the integrity of concrete is enhanced after the incorporation of NS, which makes the bond between BF and cement mortar close, and thus improves the compressive and splitting tensile strength of basalt fiber concrete.