Experimental Study On Anti-sulfate And Chlorine Salt Corrosion Performance Of Hybrid Fiber Reinforced Concrete

In this paper, based on the theory, first designed and made 126 standard cubic specimens and 9 small beam specimen to carry out compressive strength, splitting tensile and flexural strength test on the plain concrete, fly ash concrete, polypropylene fiber reinforced concrete, layered hybrid fiber reinforced concrete and non-layered hybrid fiber reinforced concrete. The results showed that 30% fly ash content reduced the compressive strength, splitting tensile strength and flexural strength compared with plain concrete reduced 10.5%,5.4%,12.3% of 28d. Although the addition of polypropylene fiber cannot improve the compressive strength of concrete, it can slightly increase the strength and splitting the brittleness of concrete. Layered hybrid fiber reinforced concrete can significantly improve the splitting tensile strength flexural strength, and the brittleness of concrete.Second, Designed and made 36 cube specimens of plain concrete, fly ash concrete, layered hybrid fiber reinforced concrete and 36 small beam specimens of that, and then put the specimens into the box to conserve for 28d of sulfate solution saturated with single factor erosion test, which a total of erosion 200d, every 50d were tested for compressive strength and flexural strength. The results showed that the anti-erosion capacity of plain concrete is poor, and compressive strength and flexural strength of erosion 200d increased more than 10.8% and 1.8% of 28d, anti-erosion ability of fly ash concrete is better than plain concrete, corrosion resistance after 200d compressive strength and flexural strength increased by 16.2% and 9.3% than 28d, layered hybrid fiber reinforced concrete compressive strength and flexural strength after erosion 200d increased 10.7% and 6.1% than that of the 28d, and changed the brittleness of concrete.And then Designed and made 36 small beam specimens including plain concrete, fly ash concrete, layered hybrid fiber reinforced concrete, and then put the specimens into the box to conserve for 28d of saturated chloride salt solution to erosion of single-factor test, which a total of erosion 200d, every 50d were tested for compressive strength and flexural strength. The results showed that effects of erosion damage on the concrete in saturated chloride salt solution are lower than that in the sulfate solution. The flexural strength of plain concrete after erosion 200d increased more than 14.6% than that of 28d, fly ash concrete increased 22.6% and layered hybrid fiber reinforced concrete increased 11.4%, and changed the brittleness of concrete. Finally, Designed and made 36 standard cubic specimens including plain concrete, fly ash concrete, layered hybrid fiber reinforced concrete, and then put the specimens into the box to conserve for 28d of saturated sulfate and chloride saturated mixture of erosion test, which a total of erosion 200d, every 50d were tested for compressive strength and flexural strength. The results showed that corrosion effect of concrete in the mixed solution is weaker than that in saturated sulphate solution, but higher than the saturated salt solution. The compressive strength of Plain concrete after erosion 200d increased more than 23.7% than that of 28d, fly ash concrete increased 30.2%, and layered hybrid fiber reinforced concrete increased 15.6%, and changed the brittleness of concrete.Figure 33 table 37 reference 80...