Experimental Study On Basic Mechanics And Chloride Corrosion Performance Of Sisal Fiber-rubber Concrete

General Secretary Xi once said:"Green water and green mountains are golden mountains and silver mountains." In order to protect the homeland and realize the sustainable use and development of resources,this article chooses to use rubber particles processed from waste automobile tires as raw materials to make concrete,so that rubber will participate again.In the construction production process to realize the recyclable use of waste materials,it is conducive to building a resource-saving society,but because rubber particles themselves are an elastic material,after adding it will cause the mechanical properties of concrete to decrease,so this article chooses to add a plant fiber—Sisal fiber,sisal fiber is tough and resistant to acid and alkali corrosion,and the material itself comes from nature,and the quantity is easy to obtain.The combination of the two can complement each other.Based on this,this paper selects rubber particles and sisal fiber to make concrete and conducts related researches.This paper selects 0-6kg/m3 of sisal fiber and a fixed amount of 10%of the volume of rubber particles to replace the sand to make the mechanical properties of the test,including the three-age concrete compressive and split tensile strength,the results It shows that adding rubber particles to the benchmark concrete has a large decrease in compressive strength.After adding sisal fiber,the situation has changed,basically showing a trend of first rising and then falling.The best effect is the SFRC-4 group,and its 28-day concrete The strength is 10.6%higher than that of the concrete with only rubber,reaching 86.1%of the strength of NC concrete,indicating that sisal fiber is effective in improving the compressive strength of rubber concrete,but the effect is not as obvious as expected.The splitting tensile strength of the three ages also showed a trend of increasing first and then decreasing.The strength increased significantly after adding sisal fiber.The strength of the best SFRC-3 specimens could reach 105%of that of NC concrete.The splitting tensile strength increased by 20%,which shows that sisal fiber has a significant effect on enhancing the splitting tensile strength of concrete,which means that sisal fiber can work with rubber particles to make up for the loss of mechanical properties caused by rubber.A dynamic impact test was performed on the concrete made by the two.The results show that adding rubber particles to the specimens will indeed improve the impact resistance of the specimens.Compared with NC concrete,it is increased by 1.2 times.It is tested that the addition of sisal fiber helps to further improve the impact resistance of rubber concrete.The best SFRC-4 group increases the energy absorption of rubber concrete by 90.9%,indicating that the sisal fiber It has a good energy absorption effect,which is related to the fact that plant fibers can be evenly distributed in the concrete and can deform and absorb energy.The concrete specimens were subjected to a chloride salt erosion test,which was divided into a clear water control group and a chloride salt erosion group.At 120 days of age,due to the erosion of the salt solution,the mechanical properties were lower than that of 90 days.The control group in clear water is also like this.Using scanning electron microscopy to perform microscopic tests on some concrete specimens,the results showed that the chloride salt solution soaked in the concrete to produce flake crystals Friedel.The s salt can fill the pores to a certain extent and increase the strength.In the later stage of corrosion,the internal stress caused by the generated chloride increases.Cracks are generated inside the concrete,causing the degradation of the macro-mechanical properties of the concrete.Obvious cracks appear at the aggregate-matrix interface after immersion in the salt solution,which can easily cause relative slippage to form through cracks during mechanical testing,resulting in reduced mechanical properties.The sisal fiber corroded by the chloride salt solution can still play a role in the mechanical test.The microscopic view can clearly see the tearing fracture marks at the end of the sisal fiber due to the mechanical test,and the overlapping fiber network structure in the concrete.Can better play the role of bridging.Figure[50]Table[12]Reference[86]...