Analysis of algorithms of influence of mix ratio parameters on carbonation resistance of C30 high-performance concrete
It studies the algorithm for the influence of mix ratio parameters on the carbonation resistance of C30 high-performance concrete.The results show that with the increase of mineral powder content,the compressive strength at 21 d increases accordingly.With the decrease of fly ash content,the 21 d compressive strength increases accordingly.The carbonation depth of C30 concrete at 126 d is significantly lower than that at 21 d,and the average carbonation depth of C30 specimens at 21 d is 7.57 mm.The average carbonization depth after 126 d is 6.51 mm.With the increase of mineral powder content and the decrease of fly ash content,the carbonation resistance of concrete specimens is improved.The optimal mix ratio for the carbonation resistance of C30 concrete is 38%of the total mass fraction of the cementitious material with C30-07 mineral powder.When the age increases from 21 d to 126 d,as the proportion of fly ash decreases,the decrease in carbonation depth of C30 concrete specimens decreases,resulting in a decrease from 1.31 mm to 0.91 mm.The application of experimental data to analyze the prediction model of concrete carbonization reveals that the factors affecting the carbonization of fly ash concrete are complex.Therefore,the use of each model should be combined with engineering to better predict the depth of concrete carbonization.Using Matlab software to conduct nonlinear regression of carbonation depth,the prediction formula of carbonation depth of 21 d fly ash concrete can be obtained.
mix ratio parameterscarbonization resistanceconcreteprediction model
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