Study On Mechanic And Alkali Corrosion Performance Of The High Strength And Hybrid Fiber Reinforced Self-compacting Concrete

As one of the most basic civil engineering materials, concrete has got the very e xtensive application in various engineering fields. With the development of the Times,the progress of science and technology, the scale of the project and the complexity o f the structure is becoming more and more advanced. The traditional concrete is beco ming more and more difficult to satisfy the requirement of complex engineering. High performance concrete, such as high-strength concrete, self-compacting concrete and fib er reinforced concrete, gradually replaces the traditional concrete consequently which o btained the widespread attention and application. It is the concrete research hot topic at present that combining the advantages of different high performance concrete produ ces a kind of high-strength self-compacting concrete for the working performance and strength grade. In order to examine the influence of fibers for high strength self-comp acting concrete strength and the alkali corrosion, in this paper, different proportions of hybrid fiber was put into prepared high strength self-compacting concrete, and formul ated the hybrid fiber high-strength self-compacting concrete finally by adjusting the do sage of water reducing agent. The performance of proportions of hybrid fiber reinforce d high strength self-compacting concrete, the mechanical property, the alkali corrosion and the microstructure also the experimentally studied and theoretically analyzed as fol lowing:(1) Adjust the content of high efficiency water reducing agent on the base of hig h strength self-compacting concrete and the hybrid fiber high-strength self-compacting concrete for the trial. Then it was tested on working performance by the proposed me thod in testing standards at home and abroad, analyzed the influence of the working p erformance of the hybrid fiber on the properties of high strength self-compacting conc rete. The test results show that, mixing hybrid fiber can reduce the mobility, the fillin g ability and the reinforcing ability of the high-strength self-compacting concrete, impr ove the integrity of the high strength self-compacting concrete and keep slumping in 2h.(2) Test the mechanical property of the high strength self-compacting concrete; a nalyze the hybrid fiber’s influence and the improved effect to the compressive strengt h and splitting tensile strength of the high strength self-compacting concrete. The test results show that, mixed with fiber can optimize the mechanical properties of high-s trength self-compacting concrete.(3) Alkali etch the hybrid fiber high-strength self-compacting concrete under the different instars and concentrations, test on compressive strength and splitting tensile strength in different corrosion in all ages, analyze the hybrid fiber’s influence on me chanical property to the hybrid fiber high-strength self-compacting concrete. The test results show that, the mixed hybrid fiber can improve the ability of concrete corrosio n resistance to alkaline solution.(4) Test the microstructure of hybrid fiber high-strength self-compacting concrete with the micro electron microscopy; analyze the hybrid fiber’s influence of the micr ostructure to high strength self-compacting concrete. The test results show that, incor porating fiber can optimize the internal structure of concrete, and improve the mechanical properties of high-strength self-compacting concrete and alkali corrosion resistan ce.