Predictions for Carbonation Depth of Marine Concrete Under Different Temperature and Humidity Environments Based on Levenberg-Marquart Algorithm
The rapid carbonation experiment of 12 groups of marine concrete was carried out under different temperature and relative humidity conditions.The experimental results showed that temperature and relative humidity had a significant impact on carbonation resistance of marine concrete.With the increase of relative humidity,the carbonation depth of marine concrete was characterized by an initial increase and then de-creased,showing a parabolic relation.Moreover,when the relative humidity was very low or very high,the carbonation rate of marine concrete was infinitely slow.While the carbonation rate of marine concrete was accelerated with the increase of temperature,the relation between carbonation depth and temperature was an exponential function.In addition,based on experimental and theoretical analysis,the temperature and humidity influence coefficients were introduced to improve the existing mathematical model of carbonation depth,and by using the Levenberg-Marquart algorithm to fit a nonlinear surface to the experimental data,a prediction model of the carbonation depth of marine concrete was constructed.This model could predict the carbonation depth of marine concrete under different temperature and humidity conditions.
marine concretecarbonation depthrelative humiditytemperaturecarbonation model
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