Test device and determining method for stability of liquid accelerating agent

A technology for testing devices and accelerators, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., and can solve the problems of lack of clear requirements for the stability of liquid accelerator products, destruction of complexation balance or hydrolysis balance, and repeatability of measurement results To achieve the effect of shortening the test cycle, accelerating the crystallization rate, and shortening the measurement time

Active Publication Date: 2018-11-27
武汉优城科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current standard of accelerators "JC 477-2005 Accelerators for Shotcrete", there is not even a clear requirement for the stability of liquid accelerator products
[0003] At present, the determination of the stability of liquid accelerator samples often adopts the method of direct observation, which is to place the sample in a 100mL stoppered measuring cylinder and let it stand for 28 days to observe whether the crystallization or precipitation at the bottom exceeds 5mL. If it does not exceed 5mL, it can be regarded as stability. Meet the requirements, but the method takes a long time and cannot predict the accelerated deterioration in the later period
Based on this, some scholars have proposed several rapid determination methods for the stability of quick-setting agents, such as CN201510329697.1 authorized "A Method for Measuring the Stability of Liquid Accelerators" and CN201510329667. Determination of Stability of Coagulant", both of these two methods need to configure the sample to be tested into a solution with a certain concentration range. This method will change the ion concentration in the original sample and destroy the network that may exist in the original sample. At the same time, this method uses low temperature and high temperature cycles in the later stage of the method, which will also change the quality of the solvent during the cycle, so the number of cycles will affect the repeatability of the measurement results.

Method used

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  • Test device and determining method for stability of liquid accelerating agent

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The present embodiment provides a kind of assay method of liquid quick-setting agent stability, and assay step is as follows:

[0034] (1) Select a certain quality of a light yellow, clear and transparent liquid quick-setting agent A, and pack it into the electrophoresis glass column 2;

[0035] (2) Place the electrophoretic glass column 2 with the sample A in the oil bath of the low-temperature oil bath 1 whose temperature is set to -10°C, and apply a DC voltage of 20V with the DC power supply 3 through the conductive joint at both ends, Place the oscillating end of the ultrasonic disperser 4 in the oil bath of the low-temperature oil bath box 1, set the oscillating frequency of the ultrasonic disperser 4 to 20 kHz, and keep it for 8 hours;

[0036] (3) The step of extracting a certain mass (2) The mass of the sample after processing m 1 , put into centrifuge rotor 5 and put into centrifuge 6 and centrifuge at 3000r / min speed for 10min, weigh the supernatant liquid ma...

Embodiment 2

[0040] This embodiment provides a method for measuring the stability of a liquid quick-setting agent. Compared with Example 1, the difference is that the temperature of the oil bath in the low-temperature oil bath box 1 in step (2) is set to 0°C, and the two ends are connected by conductive The connector is loaded with a DC power supply 3 and a DC voltage of 60V is applied, the oscillating end of the ultrasonic disperser 4 is placed in the oil bath of the low-temperature oil bath box 1, the oscillation frequency of the ultrasonic disperser 4 is set to 19.5kHz, and kept for 12h.

[0041] The test results are shown in Table 1, and Table 1 also shows the volume data of the crystals at the bottom of the sample at 28d and 60d measured by the static method (at 5°C).

Embodiment 3

[0043] This embodiment provides a method for measuring the stability of the liquid quick-setting agent. Compared with Example 1, the difference is that in step (3), the centrifuge 6 is centrifuged at a speed of 2000r / min for 5min.

[0044] The test results are shown in Table 1, and Table 1 also shows the volume data of the crystals at the bottom of the sample at 28d and 60d measured by the static method (at 5°C).

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Abstract

The invention discloses a test device and a determining method for stability of a liquid accelerating agent. The test device disclosed by the invention is composed of a low-temperature oil bath tank,an ultrasonic dispersion meter, a direct current power supply, an electrophoresis glass tubular column and a centrifugal machine; the electrophoresis glass tubular column is placed in an oil bath panof the low-temperature oil bath tank; the direct current power supply is electrically connected with the two ends of the electrophoresis glass tubular column; an oscillating end of the ultrasonic dispersion meter is arranged in the oil bath pan of the low-temperature oil bath tank. The test device disclosed by the invention utilizes the low-temperature oil bath tank to reduce the solute solubilityin a to-be-tested liquid accelerating agent, utilizes the ultrasonic dispersion meter and electrophoresis to accelerate the generation of crystal nucleus and utilizes the processes, such as solid-liquid separation by centrifuging, to enable the liquid accelerating agent to quickly lose stability and crystalize, so that the long-term stability of the liquid accelerating agent can be determined within a shorter period of time. The test device disclosed by the invention is simple and convenient in operation. The determining method has the advantages of excellent correspondence, high repeatability and the like for the test result of the stability of the liquid accelerating agent under current standard.

Description

technical field [0001] The invention belongs to the technical field of inorganic material testing equipment, and in particular relates to a testing device and a measuring method for the stability of a liquid accelerator. Background technique [0002] Liquid accelerator is a cement admixture, which can shorten the setting time of concrete slurry and improve the early strength of concrete components. Existing liquid accelerators mainly include two types: alkaline liquid accelerators (alkali content ≥ 1.0%) and non-alkali liquid accelerators (alkali content < 1.0%). Analysis of market products found that these two types of liquid accelerators Coagulants can be roughly divided into the following three categories in terms of morphology: (1) clear liquid; (2) homogeneous suspension with slight viscosity; (3) suspension with flocculent layering, etc. When the products of the above three types of forms are stored under harsh conditions such as long-term or low temperature, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00
CPCG01N33/00
Inventor 董耀武陈健代柱端周晓阳
Owner 武汉优城科技有限公司
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