Experimental Study On Freezing-thawing Resistance Of Basalt Fiber Reinforced Concrete

In China’s northern region, in order to prevent the traffic accident phenomenon due to concrete road is icy, to guarantee the normal passage of vehicles, are usually used in road de-icing salt way to reduce the freezing point road to melt snow and ice to guarantee the normal passage of vehicles. Although the deicing salt the way to a certain extent, reduce the traffic accidents, but it has a certain influence on the durability of concrete pavement, pavement cycle shorter, the use of pavement concrete of peeling off. In order to enhance the service life of concrete pavement, enhance the frost resistance of concrete, the researchers usually select incorporating fiber in the concrete ways to improve the service life of concrete pavement and freeze resistance. Concrete frost resistance of concrete pavement not only need good static mechanics performance, at the same time need concrete has good dynamic mechanics performance. The mixed basalt fiber can enhance pavement concrete mechanical properties, but also can improve the service life of pavement. With the development of science and technology and the technology is mature, the application and popularization of basalt fiber concrete had the very big development. For the northern region, the use of basalt fiber reinforced pavement durability performance and frost resistance of concrete performance is of great significance. Differs from that of basalt fiber reinforced concrete, steel fiber concrete is also a kind of high performance new composite materials were widely used in engineering practice, the steel fiber can block the effect of cracks and development. In concrete adding steel fiber can significantly improve the tensile, flexural and shear properties of concrete and ordinary concrete is greatly improved. On the other hand, the mixed steel fiber can to some extent, improve the shock resistance, toughness, and durability of concrete. Due to these excellent qualities of steel fiber, steel fiber reinforced concrete is widely used in road and bridge engineering, construction and water conservancy projects.Basalt fiber is a kind of zero pollution materials. As a kind of good environmental protection fiber, basalt fiber mixed with concrete has excellent dynamic performance, impact toughness and fracture resistance and resistance to the performance of the mill etc. According to the relevant data and actual research, we can learn, cold area of concrete damage is mainly due to the low temperature freezing and thawing damage, this kind of phenomenon in the cold region of concrete pavement performance is more obvious. Adding a small amount of basalt fibers in concrete not only can improve the integrity of concrete, at the same time can assume part of the internal stress of concrete in freeze-thaw process. Compared with basalt fiber in the concrete adding steel fiber has more obvious enhancement, toughening effect, can effectively improve the ability of the resistance of concrete crack, inhibit the generation and development of crack and improve the mechanical properties and durability of the pavement concrete, for frost resistance of concrete durability research plays an important role.Based on the characteristics of different types of fiber reinforced concrete, this paper based on the fiber type and fiber content were different fiber concrete frost resistance test analyses, and the basic mechanical properties of fiber reinforced concrete and frost resistance test analysis indicators. To observe the different fiber type and dosage of the influence of fiber concrete frost resistance. In this paper, the experimental results showed that:(1) the basalt fiber incorporation cannot effectively improve the compressive strength of concrete, steel fiber mixed with while you can to a certain extent, improve the compressive strength of concrete, but enhance the effect is not obvious;(2) fiber dosage is different for the compressive strength and frost resistance of concrete will produce certain effect;(3) by comparing the experimental research, it is concluded that the different fiber type anti-freezing in this test the optimal when the dosage of fiber;(4) steel fiber and steel fiber to enhance toughening mechanism of fiber reinforced concrete has a certain difference.