Modeling method of cement concrete road surface humidity field considering health maintenance effect

Abstract

A modeling method of cement concrete road surface humidity field considering health maintenance effect comprises the following steps: 1) establishing a control equation of water migration by using the second Fick law, wherein the function expression of the control equation is: (A formula is provided); 2) determining definite conditions for the control equation of water migration; 3) using concrete drying test data under health maintenance conditions and SPSA algorithm to demarcate parameters involved in the control equation of water migration; 4) using numerical method of user-defined format and the definite conditions as well as the demarcated parameters to solve the control equation of water migration; the solution is a humidity distribution curve, i.e., the cement concrete road surface humidity field considering the health maintenance effect. The modeling method of cement concrete road surface humidity field considering health maintenance effect overcomes the defect of the prior art that the effect of humidity gradient is not considered in cement concrete road surface stress analysis; provided is a modeling method of cement concrete road surface humidity field considering health maintenance effect which provides parameters for precise design of cement concrete road surfaces of highway and city roads.

Description

technical field [0001] The invention belongs to the technical field of highway and urban road cement concrete pavement, and relates to a modeling method of cement concrete pavement humidity field considering the effect of health preservation, which can be used in the design of highway and urban road cement concrete pavement. Background technique [0002] In the analysis theory and design method of cement concrete pavement structure, the stress analysis and calculation of pavement slab is a very important basic research work. [0003] Because the cement concrete pavement bears the traffic load, the load stress is the main component of the pavement stress. In addition to bearing the load stress, the cement concrete pavement also bears the warping stress caused by the environment due to its long-term exposure to the natural environment. The mechanism of warping stress is: when the temperature or humidity of the upper surface of the cement concrete pavement is lower than (or hi...

AI Technical Summary

Problems solved by technology

At present, there are already some modeling methods for cement concrete humidity in foreign countries, but these methods do not consider the characteristics of cement concrete pavement for roads and urban roads, that is, they do not consider the early health effect

Therefore, there is currently no mathematical model suitable for design at home and abroad to describe the moisture migration of the cement concrete pavement structure, and it is impossible to accurately predict the humidity field of the pavement slab, and thus cannot calculate the humidity warping and corresponding stress of the pavement slab

Therefore, the current domestic and foreign cement concrete pavement design methods and analysis theories do not consider the effect of the humidity gradient, thus completely ignoring the influence of the humidity gradient on the deformation and stress of the pavement.

The above status may lead to underestimation of the actual warpage and stress in the cement concrete pavement, making the design parameters of the pavement inconsistent with the actual service conditions

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