Temperature and humidity monitor stress field superimposed what effect

In many studies, it was found that the higher the ambient temperature, the higher the internal temperature of the concrete body, but the smaller the maximum temperature difference between inside and outside. Using the temperature and humidity monitor to accurately measure the environmental temperature and humidity changes in the same size of the concrete body can be seen in the test, the same pouring temperature, ambient temperature for each increase of 15 °C, the maximum temperature difference between inside and outside can be reduced by about 12 °C, thus illustrating The principle of "insulation method" for mass concrete surface. Theoretically explained, "hysteresis effect" and "weakening effect" respectively reflect the law of the influence of environmental temperature on the internal temperature of the concrete body in time and space.

The ambient temperature has a greater influence on the peak stress of the S1 history curve, and has less effect on the later stress; the ambient humidity has an effect on the stress of the S1 history curve in the middle and late period, but the effect is not very great. The difference between the simulation results of the stress field of the spherical concrete and the actual mass concrete is that the stress at the center point of the former is always under pressure, and the stress at the surface point is always pulled; while the center point of the latter is under pressure and then pulled. The main reason for the difference is that the latter is subject to external constraints on the boundary conditions, while the former is not externally constrained. Only internal constraints are used to balance internal forces.

The combination of the highest and lowest temperature environments and the highest and lowest two humidity environments was used to measure temperature and humidity using a combination of four methods. Through the temperature and humidity monitor display numerical analysis of the temperature stress field and the humidity stress field superimposed after the ball point and spherical point history curve shows that, when the temperature is the same, the humidity is higher, the S1 curve closer to the axis of the axis, that is compressive stress The smaller the tensile stress is; the higher the temperature is, the closer the S1 curve is to the axis of the abscissa, that is, the smaller the compressive stress or the tensile stress. The concrete is a compressive material, its compressive strength is high, tensile strength is very low, visible, when the concrete pouring temperature is constant, high temperature and high humidity environment is conducive to reduce stress and prevent cracks in mass concrete.

Regardless of the ambient temperature, for the edge area, the massive concrete is always pulled, and the tensile stress increases first and then decreases. The higher the ambient temperature displayed by the temperature and humidity monitor, the smaller the tensile stress of the same node. If the mass concrete is not constrained by any boundary, the inner zone is always under pressure. The higher the ambient temperature is, the smaller the compressive stress of the same node is. In short, the higher the ambient temperature, the more favorable it is to prevent temperature cracks in concrete such as concrete.

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