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Determination method and testing apparatus for permeability coefficient of cement-based material

A technology of cement-based material and permeability coefficient, which is applied in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc.

Inactive Publication Date: 2015-12-16
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology ensures good quality concrete products have better resistance against penetration by liquids compared to traditional methods like plugs or spikes that require high pressurization levels. It also allows precise control over how well it achieves this purpose without causing damage during testing. Additionally, its use does not involve expensive equipment such as pumps or other devices used at regular intervals.

Problems solved by technology

This technical problem addressed in this patents relates to improving the performance of cements when exposed to various environmental conditions like salty waters without losing their ability to filter out impurities during use. Current testing techniques involve destructively accessing the entire structure being tested, making them unsuitable for long term monitoring purposes due to limited applicabilities and potential issues associated with these types of measurements.

Method used

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  • Determination method and testing apparatus for permeability coefficient of cement-based material
  • Determination method and testing apparatus for permeability coefficient of cement-based material
  • Determination method and testing apparatus for permeability coefficient of cement-based material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 cement-based material permeability coefficient determination test method of the present invention, comprises the following steps:

[0043] 1) Pretreatment of the test piece: seal the side wall of the test piece after curing with paraffin;

[0044] 2) Install the test barrel: install the pretreated test piece in the test barrel to ensure that the contact between the test piece and the test barrel and the entire test barrel are completely sealed; The pressure unit is connected, and the water outlet valve of the test barrel is connected with the water seepage measurement unit;

[0045] 3) After the test barrel is installed, fill the test barrel with water through the water inlet pipe until water seepage occurs in the exhaust and drain valve, stop the water injection,

[0046] After setting the pressure parameters on the controller panel, start the program, start the booster pump, wait until the reading increase rate in the water seepage measurement unit reach...

Embodiment 2

[0054] Example 2 The test device constructed according to the test method described in Example 1, including a test barrel, a water injection pressurization unit, a water seepage measurement unit and a controller with a control panel, and the test piece is housed in the test barrel 24. The water inlet of the test barrel is connected with the water injection pressurization unit; the water seepage measurement unit is connected with the water outlet valve 27 of the test barrel; the controller includes a time control unit 36 and a pressure control unit 37, the signal input end of the pressure control unit is connected to the pressure sensor 38 arranged in the test barrel, the signal output end of the controller is connected to the booster pump 11 of the water injection booster unit The control terminal is connected, and the signal input and output terminals of the time control unit and the signal input and output terminals of the pressure control unit are connected to the control te...

Embodiment 3

[0069] Embodiment 3 Below with measuring water-cement ratio 0.45, aggregate content 50%, curing age is 28d, and height is 50mm, and diameter is that the permeability coefficient measurement of 250mm concrete specimen under constant pressure 1.0MPa is example, to the work of the present invention The process is described in detail as follows:

[0070] Before the test starts, the size is After standard curing for 28 days, the test piece was taken out from the curing room and the surface moisture was dried, then 50mm of each end was cut off with a cutting machine, and the side wall of the cylindrical test piece was sealed with paraffin. According to the needs of the test, select the sealing ring Ⅱ18 of the corresponding specification, according to Figure 5 As shown, the test piece 24 is sealed between the top (bottom) plate 6 and the central opening pressure plate 23. After the test piece is sealed, according to Image 6 As shown, the second cover plate 1 equipped with the se...

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Abstract

The invention provides a determination method and a testing apparatus for the permeability coefficient of a cement-based material. The method comprises the following steps: pretreatment of a test piece; installation of a testing barrel; determination of seepage quantity; and calculation of the permeability coefficient according to Darcy's law. The apparatus comprises the testing barrel, a water injection and pressure boosting unit, a seepage quantity determining unit and a controller equipped with a control panel, wherein the test piece is installed in the testing barrel, a water inlet of the testing barrel is communicated with the water injection and pressure boosting unit, the seepage quantity determining unit is connected with a water outlet gate valve of the testing barrel, a signal input port of the controller is connected with a pressure transducer arranged in the testing barrel, and a signal output port of the controller is connected with a control terminal of a booster pump of the water injection and pressure boosting unit. The invention has the following beneficial effects: sealing performance can be effectively guaranteed; constant pressure can be accurately controlled; water pressure can meet requirements of permeability testing of the cement-based material with low porosity; thus, the permeability coefficient can be determined by using a stable flow method, and the method and apparatus are applicable to permeability test of cement-based materials with different porosity.

Description

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Claims

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Application Information

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Owner ZHEJIANG UNIV OF TECH
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