Size Effect Of Basic Mechanical Properties Of Chopped Basalt Fiber Reinforced Concrete

In order to meet the needs of national economic development and infrastructure construction,improve people’s living environment and heighten the relevant services,reinforced concrete structure is widely used in the construction field.Researchers for the purpose of seeking out the concrete,which is the most commonly used artificial materials in building sector,to a higher performance,larger span,more advanced design tools and construction techniques,and the development and application of new materials rapidly,committed to seeking new breakthroughs in improving the low concrete congenital defects tensile properties,easy to crack and other characteristics.Research on new materials has become one of the hot issues and resolve concerns in structural engineering.By incorporating high performance fiber to make concrete physical and mechanical properties are improved,it will enable enhanced performance corresponding engineering improvements.Currently, steel fiber reinforced concrete is more applied in structural engineering than others, and have the appropriate technical specifications, but other types of fiber reinforced concrete still needs further improvement study. Basalt fiber with the superb properties both physical and mechanical properties is used by many scholars,but the basic research system of basalt fiber reinforced concrete needs to be improved. Among them, the size effect as the impact of quasi-brittle material strength most basic indicator to determine the variation of mechanical properties and its geometry and an accurate description of differences on the basic mechanical properties, so the size effect of the basic mechanical properties of basalt fiber reinforced concrete test system research is particularly necessary.Through the method of experimental research and size effect theory regression analysis, size effect of the basic mechanical properties of basalt fiber reinforced concrete were studied systematically. The main contents are as follows:First,by taking into account factors the strength of concrete,basalt fiber length and volume content,were cube compressive strength,axial compressive strength,splitting tensile strength and flexural tensile strength test,study the mechanical properties of different factors and the corresponding experimental phenomena.Secondly,according to the experimental data,obtained size effect coefficient and mechanism analysis of basalt fiber reinforced concrete under the influence of various factors by probability and statistics analysis.It provides some theoretical reference both the development of application and the relevant technical standards.Thirdly, in order to further explore under the influence of various factors of size effect of BFRC,were based on the the theory of energy release regression analysis to obtain each specimen nominal strength-feature size curve and related parameters,studies show that the nominal strength simulated and experimental results and theoretical analysis are in good agreement.Finally,the establishment of qualitative analysis of the microstructure and macroscopic properties by exploiting a scanning electron microscope.Qualitative description of the interaction of chopped basalt fiber and concrete.Confirmed that the incorporated fibers can refine the microstructure and improve the microstructure and macroscopic mechanical properties of concrete.