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Method for measuring communicating porosity of concrete by using non-contact impedance method and testing device

A connected porosity, non-contact technology, applied in the field of non-contact impedance method to measure the connected porosity of concrete, to achieve the effect of good stability, clear principle and simple method

Active Publication Date: 2016-03-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To truly measure the connected porosity of concrete, it is necessary to include coarse aggregate, and to ensure the uniformity of coarse aggregate in concrete, usually the side length of the specimen should be greater than 2.5 times the aggregate particle size, if the maximum particle size of coarse aggregate is 25mm, The side length of the specimen section should be around 65mm, which is difficult to achieve with traditional testing methods

Method used

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  • Method for measuring communicating porosity of concrete by using non-contact impedance method and testing device
  • Method for measuring communicating porosity of concrete by using non-contact impedance method and testing device
  • Method for measuring communicating porosity of concrete by using non-contact impedance method and testing device

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Embodiment 1

[0043] Embodiment 1 The method for measuring the connected porosity of concrete by the non-contact impedance method of the present invention comprises the following steps:

[0044] 1) Preparation of concrete to be tested:

[0045] Pouring and forming the concrete specimen to be tested or taking core samples on site, soaking in a standard concentration salt solution or vacuum saturating with salt until the pores are saturated, the concentration of the standard sodium chloride solution is 0.1-2mol / L;

[0046] 2) Preparation before measurement:

[0047] Before the experiment, ensure that the temperature of the standard concentration salt solution is the same as that of the concrete test block saturated with salt. Butt and seal the two flange pressure plates, pour standard saline solution into the liquid filling pipe to calibrate the instrument, and determine the resistivity ρ of the standard concentration saline solution 0 ;After the calibration, drain the standard salt solutio...

Embodiment 2

[0056] Embodiment 2 The test device constructed according to the method described in Example 1 includes an ion migration unit, a resistance measurement unit and a data processing unit. The ion migration unit includes two flange pressure plates 1 with through holes, a liquid filling Pipe 7, replenishment water tank 10 and pull screw 5, each port of the described liquid feeding pipe 7 corresponds to a flange pressure plate 1; The outer end faces are inserted into the through holes and sealed at the junction of the two; the inner end faces of the two flange pressure plates 1 face each other and form a test chamber for clamping the test piece through the pull screw 5, and the flange pressure plate 1 and The parts to be tested 11 are sealed by rubber gaskets 4; the rehydration water tank 10 is in communication with the liquid feeding pipe 7;

[0057] The resistance measurement unit includes a signal generator 14, a coil 13, a magnetic core 12 and a current sensor 15, and the liquid...

Embodiment 3

[0069] Embodiment 3 Taking the measurement of the concrete connected porosity of measuring the water-cement ratio 0.53 and the mix ratio as cement:water:sand:coarse aggregate=1:0.53:2.0:3.0 as an example, the work of the present invention is described in detail.

[0070] The raw material of this embodiment mixing concrete is: cement is P.I525 grade portland cement, and sand adopts the river sand of fineness modulus 2.6, and coarse aggregate adopts the crushed stone (maximum particle diameter 25mm) of continuous gradation, water Use tap water. Concrete specimens with a size of 100mm×100mm×100mm were poured in a standard mold, and after 28 days of standard curing in the curing room, 50mm of the two ends of the specimen along the length direction were cut off, and a concrete specimen with a thickness of 50mm in the middle was cut for testing. Trial test.

[0071] Dry the newly prepared concrete specimen with a size of 100mm×100mm×50mm in an oven at 105°C to a constant weight, so...

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Abstract

The invention relates to a method for measuring the communicating porosity of concrete by using a non-contact impedance method and a testing device. The method for measuring the communicating porosity of concrete comprises the following steps: measuring the resistivity of a salt solution in normal concentration, preprocessing a piece to be tested, installing a concrete test piece to be tested and an ion migration system, measuring the resistivity of the concrete test piece and calculating the communicating porosity of concrete according to an Archie equation. The testing device comprises the ion migration system, a resistivity measuring system and a data processing system, wherein the ion migration system mainly comprises a flange pressure plate, a liquid adding pipe, a liquid supplementing water channel, the piece to be tested and an opposite-pull screw; the resistivity measuring system comprises a signal generator, a coil, a magnetic core and a current sensor; and the data processing system comprises a signal processor and a central controller. The method for measuring the communicating porosity of concrete and the testing device have the beneficial effects that the limit to the size of the test piece in the traditional testing method is broken through, so as to realize the testing for the communicating porosity of concrete; the method for measuring the communicating porosity of concrete and the testing device can not only be suitable for testing the communicating porosity of concrete freshly mixed indoors, but also be suitable for testing the communicating porosity of concrete obtained through core boring sampling in the existing building structure.

Description

technical field [0001] The invention relates to the technical field of concrete porosity measurement, in particular to a method and a test device for measuring the connected porosity of concrete by a non-contact impedance method. Background technique [0002] Concrete is a porous material that has a wide range of applications in civil engineering structures. With the rapid development of the global economy and unprecedented construction scale, the use of cement-based materials has increased year by year, especially in China, where the economy is developing rapidly. my country is a big developing country and is engaged in large-scale infrastructure construction, but our country is not rich in various resources and energy, so it is more necessary to rationally use limited resources from a strategic height and scientifically design safe, For applicable and durable engineering projects, it is necessary to extend the service life of the existing infrastructure as much as possible...

Claims

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Application Information

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IPC IPC(8): G01N15/08G01N1/28
Inventor 付传清李宗津金贤玉闫东明张昀屠一军
Owner ZHEJIANG UNIV OF TECH
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