| Premature destruction of bridge pavement is always a problem for traffic managers and users,and the development of high-performance paving materials is the most direct way to solve this problem.As a new type of pavement material,epoxy polymer concrete has the characteristics of fast strength formation,good compression and bending performance,strong resistance to chemical corrosion and so on.Fiber is often used in the reinforced material of composite materials,the introduction of fiber can effectively prevent the crack growth of concrete.Compared with synthetic fibers,natural fibers have the advantages of rich resources and high performance-to-price ratio,but natural fibers have their own shortcomings,which are easily affected by environmental erosion,and their application may be affected by their own water absorption.In this paper,natural fiber reinforced epoxy polymer concrete is taken as the research object,and the effect of fiber volume admixture on its quasi static mechanical properties is studied,and according to the ultraviolet radiation and climate characteristics of Guangzhou area,An accelerated aging test scheme was designed to study the changes of quasi-static flexural and compressive properties of epoxy polymer concrete under accelerated aging.The main contents of this paper include:(1)The optimum fiber blending range of natural fiber reinforced epoxy polymer concrete was studied.The flexural properties and uniaxial compression properties of natural fiber reinforced epoxy polymer concrete with different natural fiber content were tested in this paper.The volume content range of natural fiber is determined to be a reasonable fiber blending range from 0.36% to 0.48%,in which the flexural properties of natural fibers are obviously enhanced.(2)When the volume of natural fibers is in the range of 0% to 0.48%,The maximum deviation between the test results of the flexural tensile strength of natural fiber reinforced epoxy polymer concrete and the prediction results using the mixing rate model is less than 5%,which indicates that the mixing rate model can effectively predict the flexural strength of the materials.The changes of fiber volume ratio.(3)According to the statistical results of ultraviolet radiation in Guangzhou area,the accelerated aging time is 93.3 hours,and the longest simulated aging time is six years.According to the change of flexural strength and compressive strength after different simulated aging time,the flexural strength decreases monotonously with aging time,but the rule of compressive strength with aging time is not monotone.(4)The residual strength model of composite material is extended to epoxy polymer concrete.The flexural strength of epoxy polymer concrete is fitted with the data point of simulated aging time.The fitting effect is good,and the goodness of fit is above 0.87. |
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