Device for moisture resistance testing of heat insulation fibrous material samples

FIELD: physics, tests.

SUBSTANCE: invention is related to devices for testing of construction materials and may be used to detect moisture resistance of heat insulation materials of fibrous structure, in particular products of mineral wool. Device for moisture resistance testing of heat insulation fibrous material samples comprises untight chamber with detachable cover equipped with sources and controllers of water heating to boiling, inside of which there is a detachable meshy tray for installation of tested samples. Moreover, on detachable cover there is a standard instrument for detection of compressibility of fibrous heat insulation materials. Besides movable stem of standard instrument passes through detachable cover of untight chamber inside guide tube and rests on test sample via additionally introduced spatial frame, which eliminates distortions from effect of heat and moisture medium at sample in process of its moisture resistance testing, and on top and bottom of test sample, meshy gaskets are installed for even transfer of pressure to test sample.

EFFECT: development of device that has high efficiency in operation and improved authenticity of sample testing results.

5 cl, 1 dwg

 

The invention relates to means for testing the resistance of building materials and can be used to determine the resistance of insulation materials of fibrous structure, in particular products of mineral wool.

The resistance of mineral wool insulation materials are estimated: for samples with density not less than 100 kg/m3reduction of compressive strength after testing, and for the samples with lower density is to increase the compressibility after testing [1].

A device for testing samples of insulating fibrous material moisture adopted for the prototype, containing unpressurized chamber with sources and directions heat water to boiling, inside of which is a mesh pallet is made with the possibility of fixing the necessary clearance between the water level in the unpressurized chamber and the bottom surface of the tested samples [2].

The disadvantages of the known devices are, firstly, that the test sample is carried out in two stages: in the first stage, the samples are tested in an unpressurized chamber in a hostile environment at a temperature of about 100°C. and a relative humidity of 98±2%, after which it is removed from the unpressurized chamber and placed under a press for holding the second control is Noah stage tests (compression - for solid samples, the compressibility for samples less durable).

The first disadvantage results from dvukhstadiinoi process tests in which samples must be drawn from the aggressive environment that increases the risk for the operating personnel of the testing process.

Secondly, this leads to a distortion of the true values of moisture resistance, because the samples are cooled, at which the samples significantly restore their physical and mechanical properties.

Thirdly, in the known device it is almost impossible to test the weakest mineral wool insulation materials with density up to 100 kg/m3for which the rate of marriage is not reduced compressive strength and increased compressibility. This is due to the fact that samples of such materials during the test chamber are deformed so that they cannot be removed from the camera without any additional destruction, transfer them to the standard device for determining the compressibility and spend quite complex tests according to GOST 17177 [3].

The task of the claimed invention is to provide a device having high efficiency and high reliability of test results of samples of mineral wool insulation m the materials.

The technical result consists in expanding the field of application due to the possibility of testing samples of soft fibrous insulation materials, reduce energy costs while increasing the reliability of the obtained results and the security of the testing process.

The technical result is achieved by the fact that the proposed device for testing samples of insulating fibrous material moisture containing unpressurized chamber with removable cover, with sources and regulators, heat water to boiling, inside which is located a removable mesh pallet to accommodate the test samples, with removable cover is a standard device for determining the compressibility of fibrous insulating material, a movable rod which, passing inside the guide tube through a removable lid leaking cameras, based on the sample through the additionally introduced a spatial frame, eliminating distortion from the effects of heat and humidity of the environment on the sample under test, and the top and bottom a test sample is placed mesh strip.

This design of the device, unlike the prototype, allows the determination of the compressibility of the test sample (as to heat water, which after heating the water to a boil and followed by exposure of the test sample over boiling water) without removing it from leaking cameras, that greatly increases the security of the testing process.

To prevent direct ingress drops of boiling water on the surface of the test sample clearance between the underside of the sample and the level of boiling water should be in the range of 100±10 mm [4].

The proposed device for testing samples of insulation materials on the resistance shown in the drawing and includes an unpressurized chamber 1 with a removable cover 2, which features a removable mesh pallet 3, and leaky camera 1 is supplied by sources and controls water heating 4, and a level indicator level 5, placed on the outer surface of the unpressurized chamber 1, the adjustable screw 6 serving to adjust the horizontal position of the device, water level indicator 7.

Inside unpressurized chamber 1 on the mesh pallet 3 is a prototype 8, which through the spatial frame 9 and the rod 10 standard instrument definition compressibility acts 11 specific standard load according to [3].

To install spatial frame 9 and the rod 10 in a removable cover 2 is provided by guide tube 12. Removable cover 2 are the standard instrument definition compressibility 11 including clamping screw 14 for fixing the standard of the device determine the compressibility 11 what is e 10, the gauge 15 and bracket 16 gauge 15, the measuring line 13, the sensor control temperature and humidity conditions 17, which control the operation of sources and controls water heating 4. Handles 18 are used for easy removal of the removable cover 2 when it is heated. Mesh strips 19 and 20 are mounted respectively above and below the test sample 8, serve to evenly transfer the pressure load on the test sample 8.

The operation of the device is as follows.

In non-vacuum chamber 1 install removable mesh pallet 3 and pour tap water without preheating so that the distance between the upper mesh removable mesh pallet 3 and the water level was within 100±10 mm, which control water level indicator 7. A horizontal water surface control indicator level level 5, by adjusting the adjusting screws 6. Then in the center removable mesh pallet 3 place the test sample 8, the top and bottom of which are placed mesh gaskets 19, 20, respectively, and sets the spatial frame 9 and close unpressurized chamber 1 removable cover 2, with the placed devices determine the magnitude of the compressibility test sample 8. This compressibility before and after endurance test sample 8 n the d boiling water determine without removing it from leaking camera 1 that distinguishes the principle of operation during testing of the claimed device from the prototype.

First, to heat water, a prototype 8 through the stem 10 and the spatial frame 9 is passed to unit load (2000±30) PA. While measuring the thickness of a test specimen 8 (a value of h1). Then include the source and regulator of water heating 4. After boiling water for 15-20 minutes a prototype 8 stand over boiling water, within the time determined in accordance with methods described in [5]. Then measure the thickness of the heated test sample 8 (a value of h2), which is fixed gauge 15 or measuring scale 13. Then, the sensor control temperature and humidity conditions 17 off sources and controls water heating 4.

For the period from the incorporation of the source and regulator of water heating 4 and endurance prototype 8 above the boiling water there are significant changes in the structure of the prototype 8, to increase its compressibility, which leads to a change (decrease) the thickness of the test sample 8, the fixed elements of the standard device for determining the compressibility 11.

The value of the compressibility WithWis determined in this case from the expression

where h1 - the thickness of a test specimen (mm) before turning on the heat source water;

h2- the thickness of a test specimen (mm) after holding it over boiling water.

For most of the investigated mineral materials with density up to 100 kg/m3(various synthetic binder) relative change in compressibility is 5-28%.

Example. Determination of the compressibility of mineral wool density 75 kg/m3on penelopetwo binder

In non-vacuum chamber 1 install removable mesh pallet 3 and pour tap water without preheating so that the distance between the upper mesh removable mesh pallet 3 and the water level was within 100±10 mm, which control water level indicator 7. A horizontal water surface control indicator level level 5, by adjusting the adjusting screws 6. Then in the center removable mesh tray 3 placed a prototype 8, and it set the spatial frame 9 and close the unpressurized chamber 1 removable cover 2, with the placed nodes determine the magnitude of the compressibility. While the top and bottom of a test sample placed mesh strip.

To determine the moisture resistance initially in accordance with the requirements of GOST 17177 [2] determined the compressibility of the prototype 8 p is on the unit load (2000±30) PA, measuring its thickness h1which in this case is equal to 65 mm, Then include the source and regulator of water heating 4 and withstand the prototype 8 over boiling water for (15±1) minutes according to procedure [5]. Then record the new value of the thickness of the test sample 8 h2equal in this case 53 mm

The value of the compressibility over boiling waterWdetermined from the expression (1)

Thus, the present invention allows to:

1. Significantly reduce the duration and increase the efficiency of testing;

2. To increase the reliability and validity of measurements, while improving working conditions and safety of personnel in enterprises and research organizations that conduct these tests.

3. To test prototypes mineral wool insulation materials moisture on one portable device without removing samples from the unpressurized chamber.

Sources of information

1. Insulating panels made of mineral wool with synthetic binders. Technical conditions. GOST 9573-96.

2. Copyright certificate №1078303, MKI G01N 25/56, 1982 (prototype).

3. Materials and products building insulation. Control methods. GOST 17177-94.

4. Beavers UL, Tkachenko YEAR the valuation moisture resistance of mineral wool increased rigidity. Scientific-technical abstract collection. VNIIEM, VIP, M., 1982

5. Beavers UL, Ovcharenko Mrs x, the shochet BM, Petukhova EJ Insulation materials and design (tutorial). Meters, Infra. - M., 2003

1. Device for testing samples of insulating fibrous material moisture containing unpressurized chamber with removable cover, with sources and regulators, heat water to boiling, inside which is located a removable mesh pallet to accommodate the test samples, with removable cover is a standard device for determining the compressibility of fibrous insulating material, characterized in that the movable rod standard device passes through a removable lid leaking cameras inside the guide tube and is based on the prototype through the additionally introduced a spatial frame, eliminating distortion from the effects of heat and humidity of the environment on the specimen when it is tested for water resistance.

2. The device according to claim 1, characterized in that the total weight of the elements of the standard device for determining compressibility, including the weight of the spatial framework, equal to the mass of the standard load, which determines the compressibility.

3. The device according to claim 1, characterized in that it introduced the sensors automatically control the temperature and humidity conditions during testing of prototypes.

4. The device according to claim 1, characterized in that the magnitude of the compressibility test samples is determined from the expression:

where h1- the thickness of a test specimen (mm) before turning on the heat source water;
h2- the thickness of a test specimen (mm) after holding it over boiling water.

5. The device according to claim 1, characterized in that the top and bottom of a test sample placed mesh strip to a uniform pressure load on the prototype.



 

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