Isothermal-measure testing apparatus for cement initial hydration exothermic characteristic

Abstract

An isothermal-measure testing apparatus for cement initial hydration exothermic characteristic is disclosed. A sample cup of the test apparatus is put in a sample cup pool, stirring blades of a water-bath stirrer are arranged to close to radiating fins, the water-bath stirrer is eccentrically arranged in a water-bath kettle, the radiating fins of a semiconductor refrigeration/heating sheet are arranged in the water-bath kettle, one end of hydration injection water pipe is provided with a water injection port inserted by an injector, and the other end is provided with a hydration water outlet; the test apparatus comprises two thermistors, the first thermistor is at the center of the bottom of the sample cup pool and is used for sensing the sample temperature, and the second thermistor is adhered to the lower part at the outer side of the sample cup pool and is immersed into water bath and is used to sense the water bath temperature; and the temperature difference expressed by the two thermistors is taken as representation of the cement initial hydration exothermic characteristic. The test apparatus is capable of completely accurately measuring the first heat-release peak during cement initial hydration.

Description

1. Technical field [0001] The invention relates to the technical field of cement hydration heat test equipment, in particular to a test device for isothermal measurement of cement initial hydration heat release characteristics. 2. Background technology [0002] The heat release characteristics of initial hydration of cement refer to the size and rate of heat released by cement hydration within 0 to tens of minutes. According to previous studies, the heat release characteristics of cement at the initial hydration are closely related to many properties of cement. Therefore, it is very important to measure the heat release characteristics of cement from the beginning of hydration to tens of minutes to understand and master the performance of cement. . [0003] The hydration exothermic characteristics of cement refer to the amount and rate of heat released by cement during the hydration process, which is generally expressed by the temperature change range and rate of hydration ...

AI Technical Summary

Problems solved by technology

The chemical solution heat measurement method can only measure the heat of hydration at a relatively long age, and the operation is relatively cumbersome, and the chemical reagents used are highly corrosive and unsafe, so the isothermal and adiabatic measurement methods are more commonly used

[0005] When the isothermal or adiabatic method is used to measure the heat release characteristics of cement hydration, it is often necessary to mix the cement with water according to a certain water-cement ratio in advance to form a cement slurry before measuring the heat release of the slurry, which leads to the mixing process and equipment. The exothermic characteristics of hydration cannot be measured within a few minutes like this, and information about the release characteristics of the initial heat of hydration of cement is missed

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