A kind of cement-based material early age relative humidity measuring device and measuring method

Abstract

The invention relates to a device for measuring early-age relative humidity of a cement-based material. In order to measure the early-age relative humidity of the cement-based material, a brand new design structure is adopted, the early-age internal high temperature of the cement-based material and damage of high humidity on a sensor probe can be effectively avoided, and an early-age relative humidity curve of the cement-based material can be accurately obtained. The invention also relates to a method for measuring the early-age relative humidity of the cement-based material. Aiming at previous data, a spot measurement method is adopted, the condition that the sensor probe is damaged by the continuous saturated relative humidity and the high temperature can be avoided, and when the humidity of the cement-based material is lower than 100 percent, the humidity is automatically collected by a computer, a high-precision humidity curve can be obtained, and the sensor can be prevented from being damaged.

Description

technical field [0001] The invention relates to a relative humidity measuring device and a measuring method for cement-based materials at an early age, and belongs to the technical field of building material measurement. Background technique [0002] With the continuous progress and development of society, the performance requirements of concrete and other cement-based materials are getting higher and higher in actual engineering. At the same time, cracking caused by high shrinkage of high-performance concrete is becoming more and more common. Cracking of concrete structures is a One of the main reasons for the reduction of durability of actual structural engineering at present. Relative humidity inside concrete is one of the important parameters to study shrinkage. Therefore, in order to ensure the durability of concrete structures, it is necessary to study the humidity measurement of cement-based materials such as concrete. [0003] At present, high-precision measurement...

AI Technical Summary

Problems solved by technology

Moreover, the internal relative humidity of cement-based materials in the early stage is generally above 98%. Such an internal environment determines the difficulty of measuring the relative humidity in the early stage of cement-based materials.

Although some low-accuracy humidity sensors can start measuring earlier, due to the low accuracy, the previous measurement error is too large, so the provided data research is of little significance

[0004] Due to the existence of the above problems, there are few high-precision early relative humidity (especially the first 3 days of age) curves in the literature, and it is generally believed that the relative humidity of the first 2 to 3 days is 100%.

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