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Testing device and testing method for cement initial hydration exothermic character isothermal measurement

A hydration heat release and test device technology, applied in the field of cement hydration heat test equipment, can solve the problems of unsafe, cumbersome operation, inability to measure the hydration heat release characteristics, etc., and achieve the effect of eliminating slowness

Inactive Publication Date: 2015-03-25
GUANGXI UNIV +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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
[0004] 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

Method used

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  • Testing device and testing method for cement initial hydration exothermic character isothermal measurement
  • Testing device and testing method for cement initial hydration exothermic character isothermal measurement

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Embodiment 1

[0028] like figure 1 As shown, the test device for isothermal measurement of cement initial hydration exothermic characteristics of the present invention includes a sample cup 1, a sample cup cover 2, a water outlet for hydration 3, a sample cup pool 4, a water bath stirrer 5, and a semiconductor refrigerator. / heating sheet 6, heat sink 7, hydration water injection pipe 8, first thermistor 9, second thermistor 10, water injection port 11 and water bath pot 12, semiconductor refrigeration / heating sheet 6 is installed in the water bath pot 12 At the position of about one-third of the height, there are aluminum heat sinks on both sides, one heat sink 7 extends into the water bath pot 7 to contact with the water bath, and the other heat sink is placed in the water bath pot It is also equipped with a DC 12V electric fan to drive away the heat or cold of the heat sink. A tripod stand is placed on the bottom of the water bath pot. There are holes with a suitable diameter on the shel...

Embodiment 2

[0033] This embodiment is a test method using the test device for isothermal measurement of the initial hydration exothermic properties of cement, including the following steps:

[0034] (1) Turn on the power supply of the semiconductor refrigeration / heating plate 6 and the water bath agitator 5, set the required constant temperature of the water bath within the range of 20-30°C, after a period of time, the water bath reaches a constant temperature state, and the constant temperature accuracy is better than ±0.005°C;

[0035] (2) Weigh 4.00g of the cement sample 13 to be tested after passing through a 0.080mm square hole sieve, homogenizing and drying at 65-70°C / 3h with a balance with 1% accuracy, and put it into the sample cup 1 several times, Use a weighing spoon to gently move the cement sample 13 in the cup to make the initial distribution of the cement sample 13 even in the cup, and then rotate the sample cup 1 while gently vibrating on a flat table, so that the samples in...

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Abstract

The invention discloses a testing device and a testing method for cement initial hydration exothermic character isothermal measurement. The testing device comprises a water bath constant-temperature system, a temperature sensing system and an isothermal water adding system, wherein the water bath constant-temperature system is composed of a semiconductor refrigerating / heating fin and heat dissipation fins, and temperature control is carried out by a singlechip; a water bath kettle is internally provided with eccentric water bath for stirring; thermisters positioned on the bottom of the center and the lower part of the outer side of a sample cup tank are used for sensing the temperature of to-be-tested cement samples and the temperature of water bath, and the temperature difference between the to-be-tested cement samples and the water bath is detected via a balanced bridge and an electronic amplifying system, and acts as the representation of the cement initial hydration exothermic character; hydration water in a spiral plastic water injection pipe in water bath reaches the temperature balance, and then is injected into a to-be-detected sample; the water adding mode can guarantee that the temperature for hydration use and the temperature of the to-be-tested samples tend to be consistent; the first exothermic peak of cement initial hydration can be measured completely and accurately.

Description

1. Technical field [0001] The invention relates to the technical field of cement hydration heat test equipment and methods, in particular to a test device and test method for isothermal measurement of the initial hydration heat release characteristics of cement, in particular to a method of isothermal water addition, and the cement hydration sample temperature and The temperature difference of the water bath temperature is used as a characterization of the exothermic characteristics of the initial hydration of cement, and the temperature of the environment is kept constant during the measurement process. 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 me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/48
Inventor 冯庆革李浩璇杨义宋宝玲黄小青王孝英王东波
Owner GUANGXI UNIV
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