Influence of rice straw ash on compressive properties and microstructure of concrete
In order to explore the influence of rice straw ash on the properties of ordinary concrete,the compression test was carried out with rice straw ash concrete with different curing days and different substitution rates(0%,5%,10%,15%,20%)as the research object.Poisson's ratio is used as an evaluation index to reveal the influence of rice straw ash on the properties of concrete,a constitutive model of rice straw ash concrete is proposed and established,the compressive failure mode of rice straw ash concrete specimens is analyzed by finite element method,and the microscopic analysis is carried out by scanning electron microscope,the results show that compared with ordinary concrete,with the increase of substitution rate,the stress-strain curve of rice straw ash concrete cured for 28 days is significantly different,and the peak stress,The peak strain decreased to varying degrees,the curve changed slightly after 128 days of curing,the peak stress and peak strain increased to different degrees,and the peak strain increased by 12.24%when the substitution rate was 5%,and the long-term strength was the best.The results of this study can provide technical support for the industrial application of rice straw ash concrete,and provide a theoretical basis for the utilization of rice straw ash by-products produced by biomass power plants to promote agricultural cycle and increase agricultural income.
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