CN105004603A - Sample for testing adhesion and anti-shearing strength of refractory mortar and testing method thereof - Google Patents

Abstract

The invention relates to a sample for testing the bonding shear strength of refractory mud and a testing method thereof. The plan is: the sample is a whole made of three refractory bricks bonded with the refractory mud to be tested. The specific shape is: first, the upper and lower planes of the three refractory bricks are even; The lower plane of the bricks is even, and the upper plane of the middle refractory brick is higher than the upper plane of the refractory bricks on both sides; the third is that the upper plane of the middle refractory brick is higher than the upper plane of the refractory bricks on both sides, and the lower plane of the middle refractory brick is recessed by two The lower plane of the side refractory bricks. The material of the three refractory bricks matches the material of the refractory mud to be tested, and the bonding surface of the refractory mud of the three refractory bricks is the original brick surface of the refractory brick. The shapes of the three refractory bricks are: the middle refractory brick is a cuboid or a cube, and the refractory bricks on both sides are a cuboid or a cube or a trapezoid with a vertical bonding surface. The invention has the advantages of convenient preparation and large sample size; the test process of the prepared sample is simple and the test result is accurate and reliable.

Description

A sample for testing the bonded shear strength of refractory mud and its testing method

technical field

The invention belongs to the technical field of refractory material samples. In particular, it relates to a sample for testing the bonding shear strength of refractory mud and a testing method thereof.

Background technique

The bonded shear strength of refractory mud at room temperature is of great significance to ensure the stability and quality of high-temperature kiln lining masonry, while the bonded shear strength of refractory mud at high temperature is more instructive for the actual use process. The bonded shear strength of refractory mud is the ratio of the maximum shear force that the sample can bear to the bonded area, that is, the ultimate average shear stress of the bonded surface. The original YB/T 5124-93 stipulates that during the measurement, the L-shaped test block made of refractory bricks is double-L reverse bonded with the refractory mud to be tested, and it is dried or burned at room temperature. Shear test until the bonded surface breaks. Since the bonding surface of the sample is too small (30mm×40mm), and it is not bonded on the original brick surface of the refractory brick, and it is too far from the actual building method of the refractory brick, it is difficult to prepare samples. This standard was issued in August 2011. was abolished on the 15th.

At the Joint International Conference on Refractory Materials held in Kyoto, Japan in November 2011, J.Brulin et al. proposed another relatively simple sample shape for testing the bonded shear strength of refractory mud. The sample consists of 2 The sample with a certain oblique angle is bonded by refractory mud. During the test, the load is applied from above until the bonded surface breaks, and the refractory value can be calculated according to the maximum load, the angle between the bonded surface and the vertical direction, and the bonded area. The bond shear strength of the mud. However, it is also difficult to ensure that the bonding surface of the sample is the original brick surface, even if it can, it also increases the difficulty of sample preparation; in addition, it is not easy to accurately measure the angle of the bevel.

The two existing samples used for testing the bonded shear strength of refractory mud have the disadvantages of too small size of the sample, difficulty in preparation, and difficulty in ensuring that the original brick surface is used as the bonded surface.

Invention content:

The present invention aims to overcome the above-mentioned technical defects, and aims to provide a sample for testing refractory mud bonding shear strength which is convenient to prepare and has a large sample size. The prepared sample has a simple testing method and accurate and reliable testing results.

In order to achieve the above tasks, the technical solution adopted by the present invention is: the sample is a whole made of three refractory bricks bonded by the refractory mud to be tested. The three refractory bricks are called the left refractory brick, the middle refractory brick and the right refractory brick from left to right. The left refractory brick and the right refractory brick are collectively called the two side refractory bricks; The sides are all flush, and the refractory bricks on both sides are arranged symmetrically.

There are three specific shapes of the sample: the first one is that the lower plane of the middle refractory brick is flush with the lower planes of the refractory bricks on both sides, and the upper plane of the middle refractory brick is flush with the upper planes of the refractory bricks on both sides; One is that the lower plane of the middle refractory brick is flush with the lower planes of the refractory bricks on both sides, and the upper plane of the middle refractory brick is 5~20mm higher than the upper plane of the refractory bricks on both sides; the third is that the upper plane of the middle refractory brick is higher than The upper plane of the refractory bricks on both sides is 5~20mm, and the lower plane of the middle refractory brick is recessed into the lower plane of the refractory bricks on both sides by 5~20mm.

The material of the three refractory bricks matches the material of the refractory mud to be tested, and the bonding surface of the refractory mud of the three refractory bricks is the original brick surface of the refractory brick.

The thickness of the bonding surface of the refractory mud to be tested is equal, and the thickness of the bonding surface is 1~3mm.

The shapes of the three refractory bricks are: the middle refractory brick is a cuboid or a cube, and the refractory bricks on both sides are a cuboid or a cube or a trapezoid with a vertical bonding surface; The bonding surfaces of the bricks are the same.

The refractory mud to be tested is a method of measuring mud consistency according to GB/T 22459.1—2008/ISO 13765-13765-1:2004 or GB/T 22459.2—2008/ISO 13765-2:2004. The tested refractory mud is adjusted to the required consistency.

The bonding is according to the method of GB/T 22459.3-2008/ISO 13765-13765-3:2004, and the three refractory bricks are bonded as a whole with the refractory mud to be tested to the consistency required for use.

  A test method for testing specimens for bonded shear strength of refractory mud, the specific steps of which are:

Step 1. Dry the sample, and then measure the bonding surface area of the sample.

Step 2. At room temperature, place the sample on the lower pressing plate of the pressure testing machine; or place two strip-shaped pressing plates in parallel on both sides of the center line of the lower pressing plate, and then place the sample on two On the strip-shaped pressing plate, the distance between the inner surfaces of the two strip-shaped pressing plates is the sum of the width of the middle refractory brick and the thickness of the two refractory mud bonding surfaces to be tested; or the distance between the sample placed in the high-temperature furnace The lower platen of the pressure testing machine.

Step 3. At room temperature, lower the upper pressing plate on the upper plane of the sample; or place a strip-shaped pressing plate on the upper plane of the middle refractory brick of the sample, and then lower the upper pressing plate on the upper plane of the strip-shaped or raise the temperature of the high-temperature furnace at the required rate, keep it warm after reaching the required temperature, and lower the upper pressing plate on the upper plane of the sample after reaching the holding time.

Step 4, start the pressure testing machine, pressurize at a loading rate of 0.9~1.1MPa/s, until the bonding surface of the sample breaks, record the maximum load at the time of breaking, and obtain the normal temperature shear resistance of the refractory mud bond. strength or high temperature shear strength of refractory mud bonds.

In the above test method: the area of the lower platen is 1 to 1.2 times the area of the lower plane of the sample.

The upper pressing plate is installed on a spherical seat to compensate for the slight deviation between the parallelism of the sample placed on the pressure testing machine and the upper pressing plate; the area of the upper pressing plate is 1 to 1.2 times the upper plane area of the sample.

The length L2 of the strip-shaped pressing plate is the same as the length L of the refractory brick, and the width B2 of the strip-shaped pressing plate is 0.7 to 0.9 times the width B of the refractory brick.

Owing to adopting above-mentioned technical scheme, the present invention has following positive effect compared with prior art:

The invention simplifies the preparation process of the sample for testing the bonded shear strength of refractory mud, and at the same time significantly increases the bonded area between the refractory mud to be tested and the refractory bricks that make up the sample, and naturally retains the refractory bricks. The original brick surface is used as the bonding surface. Therefore, the test conditions in the laboratory are close to or consistent with the actual application conditions of the refractory mud, the test results are accurate and reliable, and the test results of the bond shear strength of the refractory mud can guide the actual use process, especially the performance of the refractory mud at high temperature. Bond shear strength is more instructive for the actual use process.

The samples prepared by the present invention do not need special equipment in the test process, and for samples whose upper or lower planes are flush, only a bar-shaped pressing plate needs to be placed in the test, so the test method is simple.

Therefore, the present invention has the characteristics of convenient preparation and large sample size, and the prepared sample test process is simple and the test result is accurate and reliable.

Description of drawings

Fig. 1 is the first shape schematic diagram of the present invention;

Fig. 2 is a kind of schematic diagram in the second shape of the present invention;

Fig. 3 is a kind of schematic diagram in the third shape of the present invention;

Fig. 4 is another schematic diagram in the second shape of the present invention;

Fig. 5 is another schematic diagram in the third shape of the present invention;

Fig. 6 is a schematic diagram of testing the sample shown in Fig. 1 using a strip press plate.

Detailed ways

Below, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments, which is not intended to limit its protection scope.

Example 1

A sample for testing the bonded shear strength of refractory mud. The sample is a whole formed by bonding three refractory bricks with the refractory mud to be tested. The three refractory bricks are called the left refractory brick, the middle refractory brick and the right refractory brick from left to right. The left refractory brick and the right refractory brick are collectively called the two side refractory bricks; The sides are all flush, and the refractory bricks on both sides are arranged symmetrically.

The specific shape of the sample described in this example is shown in Figure 1: the lower plane of the middle refractory brick is flush with the lower planes of the refractory bricks on both sides, and the upper plane of the middle refractory brick is flush with the upper planes of the refractory bricks on both sides.

The material of the three refractory bricks matches the material of the refractory mud to be tested, and the bonding surface of the refractory mud of the three refractory bricks is the original brick surface of the refractory brick;

The thickness of the bonding surface of the refractory mud to be tested is equal, and the thickness of the bonding surface is 1~3mm;

As shown in Figure 1, the shapes of the three refractory bricks are cubes, that is, the length L, width B and height H of the three refractory bricks are all equal. The bonding surface of the refractory bricks on both sides is the same as that of the middle refractory brick.

The refractory mud to be tested is a method of measuring mud consistency according to GB/T 22459.1—2008/ISO 13765-13765-1:2004 or GB/T 22459.2—2008/ISO 13765-2:2004. The tested refractory mud is adjusted to the required consistency.

The bonding is according to the method of GB/T 22459.3-2008/ISO 13765-13765-3:2004, and the three refractory bricks are bonded as a whole with the refractory mud to be tested to the consistency required for use.

The test method of the sample for testing the bonded shear strength of refractory mud prepared in this embodiment is:

Step 1. Dry the sample shown in Figure 1, and then measure the bonding surface area of the sample.

  Step 2. At room temperature, place two strip-shaped pressure plates in parallel on both sides of the center line of the lower pressure plate of the pressure testing machine. As shown in Figure 6, the sample is placed on two strip-shaped pressing plates, and the distance between the inner surfaces of the two strip-shaped pressing plates is the width of the middle refractory brick and the bonding surface of the two refractory mud to be tested. sum of thicknesses.

Step 3. At room temperature, as shown in Figure 6, place a strip-shaped pressing plate on the upper plane of the middle refractory brick of the sample, and then lower the upper pressing plate on the strip-shaped pressing plate.

Step 4: Start the pressure testing machine, pressurize at a loading rate of 0.9~1.1MPa/s until the bonded surface of the sample breaks, record the maximum load at the time of breakage, and obtain the normal temperature shear strength of the refractory mud.

In the above test method: the area of the lower platen is 1 to 1.2 times the area of the lower plane of the sample.

The upper pressing plate is installed on a spherical seat to compensate for the slight deviation between the parallelism of the sample placed on the pressure testing machine and the upper pressing plate; the area of the upper pressing plate is 1 to 1.2 times the upper plane area of the sample.

As shown in Figure 6, the length L2 of the strip plate is the same as the length L of the refractory brick, and the width B2 of the strip plate is 0.7 to 0.9 times the width B of the refractory brick.

Example 2

A sample for testing the bonded shear strength of refractory mud. Except described sample shape, all the other are with embodiment 1:

The specific shape of the sample described in this example is shown in Figure 2: the lower plane of the middle refractory brick is flush with the lower planes of the refractory bricks on both sides, and the upper plane of the middle refractory brick is higher than the upper plane of the refractory bricks on both sides.

The shapes of the three refractory bricks are as shown in Figure 2: the middle refractory brick and the refractory bricks on both sides are cuboids, wherein: the height difference between the height H1 of the middle refractory brick and the length H of the refractory bricks on both sides is 5 ~ 20mm, and the middle refractory brick The length L of the refractory brick is equal to the length L of the refractory bricks on both sides, and the width B1 of the middle refractory brick is greater than or equal to or smaller than the width B of the refractory bricks on both sides.

The test method of the sample for testing the bonded shear strength of refractory mud prepared in this embodiment is:

Step 1, with embodiment 1.

Step 2. Under room temperature conditions, place two strip-shaped pressing plates parallel to both sides of the centerline of the lower pressing plate, and then place the sample on the two strip-shaped pressing plates. The distance between the inner surfaces of the two strip-shaped pressing plates is The sum of the width of the intermediate refractory brick and the thickness of the bonded surfaces of the two refractory slurries to be tested.

Step 3. Lower the upper pressing plate on the upper plane of the sample under room temperature conditions.

Step 4, with embodiment 1.

Example 3

A sample for testing the bonded shear strength of refractory mud. Except described sample shape, all the other are with embodiment 1:

The specific shape of the sample described in this embodiment is shown in Figure 3: the upper plane of the middle refractory brick is 5-20mm higher than the upper plane of the refractory bricks on both sides, and the lower plane of the middle refractory brick is recessed into the lower plane of the refractory bricks on both sides 5~20mm.

The shapes of the three refractory bricks are as shown in Figure 3: the middle refractory brick and the refractory bricks on both sides are cuboids, wherein: the height H1 of the middle refractory brick is equal to the height H of the refractory bricks on both sides, and the width B1 of the middle refractory brick It is greater than or equal to or less than the width B of the refractory bricks on both sides, and the length L of the middle refractory brick is equal to the length L of the refractory bricks on both sides.

The test method of the sample for testing the bonded shear strength of refractory mud prepared in this embodiment is:

Step 1, with embodiment 1.

 Step 2. Place the sample on the lower platen at room temperature.

Step 3. Lower the upper platen on the upper plane of the sample at room temperature.

Step 4, with embodiment 1.

Example 4

A sample for testing the bonded shear strength of refractory mud. Except described sample shape, all the other are with embodiment 1:

The specific shape of the sample described in this embodiment is shown in Figure 4. The lower plane of the middle refractory brick is flush with the lower planes of the refractory bricks on both sides, and the upper plane of the middle refractory brick is higher than the upper plane of the refractory bricks on both sides.

The shapes of the three refractory bricks are shown in Figure 4: the middle refractory brick is a cuboid, and the refractory bricks on both sides are trapezoids with vertical bonding surfaces. Among them: the height difference H1 between the height H1 of the middle refractory brick and the length H of the refractory bricks on both sides is 5~20mm, the length L of the middle refractory brick is equal to the length L of the refractory bricks on both sides, and the width B1 of the middle refractory brick is greater than or equal to or It is smaller than the upper plane width B0 of the refractory bricks on both sides, and the lower plane width B of the refractory bricks on both sides is greater than the upper plane width B0.

The test method of the sample for testing the bonded shear strength of refractory mud prepared in this embodiment is:

Step 1, with embodiment 1.

Step 2. Under room temperature conditions, place two strip-shaped pressing plates parallel to both sides of the centerline of the lower pressing plate, and then place the sample on the two strip-shaped pressing plates. The distance between the inner surfaces of the two strip-shaped pressing plates is The sum of the width of the intermediate refractory brick and the thickness of the bonded surfaces of the two refractory slurries to be tested.

Step 3. Under room temperature conditions, lower the upper platen on the upper plane of the sample; or place a bar-shaped platen on the upper plane of the middle refractory brick of the sample, and then lower the upper platen on the bar-shaped platen superior.

Step 4, with embodiment 1.

Example 5

A sample for testing the bonded shear strength of refractory mud. Except described sample shape, all the other are with embodiment 1:

The specific shape of the sample described in this embodiment is shown in Figure 5: the upper plane of the middle refractory brick is higher than the upper plane of the refractory bricks on both sides by a height H0=5~20mm, and the lower plane of the middle refractory brick is recessed into the refractory bricks on both sides The lower plane of the brick is 5~20mm.

The shapes of the three refractory bricks are as shown in Figure 5: the middle refractory brick and the refractory bricks on both sides are cuboids, wherein: the height H of the middle refractory brick is equal to the height of the length H of the refractory bricks on both sides, and the height of the middle refractory brick The length L is equal to the length L of the refractory bricks on both sides, and the width B1 of the middle refractory brick is greater than or equal to or smaller than the width B of the refractory bricks on both sides.

The test method of the sample for testing the bonded shear strength of refractory mud prepared in this embodiment is:

Step 1. Dry the sample, and then measure the bonding surface area of the sample.

  Step 2. Place the sample on the lower platen of the pressure testing machine in the high temperature furnace.

Step 3. Raise the temperature of the high-temperature furnace according to the required rate, keep it warm after reaching the required temperature, and lower the upper platen to the upper plane of the sample after reaching the holding time.

Step 4, start the pressure testing machine, pressurize at a loading rate of 0.9~1.1MPa/s, until the bonding surface of the sample breaks, record the maximum load at the time of breaking, and obtain the high temperature shear resistance of the refractory mud bond. strength.

Compared with the prior art, this specific embodiment has the following positive effects:

This specific embodiment simplifies the preparation process of the sample for testing the bonded shear strength of refractory mud, and at the same time significantly increases the bonding area between the refractory mud to be tested and the refractory bricks that make up the sample, and naturally retains the The original brick surface of the refractory brick is used as the bonding surface. Therefore, the test conditions in the laboratory are close to or consistent with the actual application conditions of the refractory mud, and the test results are reliable, which improves the guiding role of the test results of the bond shear strength of the refractory mud for the actual use process, especially the viscosity of the refractory mud at high temperature. The knot shear strength is more instructive for the actual use process.

The samples prepared in this specific embodiment do not need special equipment during the test, for the samples whose upper and lower planes are flush or the lower planes are flush. During the test, it is only necessary to place two strip-shaped pressing plates on the lower planes of the refractory bricks on both sides correspondingly, and place one strip-shaped pressing plate on the upper plane of the middle refractory bricks. Therefore, the test method is simple and does not require special equipment.

Therefore, this specific embodiment has the characteristics of convenient preparation and large sample size, and the prepared sample has a simple test process and accurate and reliable test results.

Claims (8)

1. a test refractory wass bonding shear strength sample, it is characterized in that described sample is the entirety be bonded to by three blocks of refractory brick with refractory wass to be tested, three blocks of refractory brick are called left side refractory brick, middle refractory brick and right side refractory brick from left to right successively, and left side refractory brick and right side refractory brick are referred to as both sides refractory brick; The leading flank of three blocks of refractory brick is all concordant with trailing flank, and both sides refractory brick is symmetrical arranged;

The concrete shape of described sample has three kinds: the first is that the lower plane of middle refractory brick is concordant with the lower plane of both sides refractory brick, and the upper plane of middle refractory brick is concordant with the upper plane of both sides refractory brick; The second is that the lower plane of middle refractory brick is concordant with the lower plane of both sides refractory brick, and the upper plane of middle refractory brick exceeds the upper plane 5 ~ 20mm of both sides refractory brick; The third is upper plane 5 ~ 20mm that the upper plane of middle refractory brick exceeds both sides refractory brick, the lower plane 5 ~ 20mm of the lower plane recessed both sides refractory brick of middle refractory brick;

The material of described three blocks of refractory brick and the material of described refractory wass to be tested match, and the refractory wass adhesive surface of described three blocks of refractory brick is the former brick face of refractory brick;

The adhesive surface thickness of described refractory wass to be tested is equal, and described adhesive surface thickness is 1 ~ 3mm.

2. test refractory wass bonding shear strength sample according to claim 1, it is characterized in that the shape of described three blocks of refractory brick is: middle refractory brick is rectangular parallelepiped or for square, both sides refractory brick is rectangular parallelepiped or for square or be the vertical prismatoid of adhesive surface; The adhesive surface of both sides refractory brick is identical with the adhesive surface of middle refractory brick.

3. test refractory wass bonding shear strength sample according to claim 1, it is characterized in that described refractory wass to be tested is according to a kind of method measuring slip consistency in GB/T 22459.1-2008/ISO 13765-13765-1:2004 or GB/T 22459.2-2008/ISO 13765-2:2004, refractory wass to be tested is debugged the denseness of request for utilization.

4. test refractory wass bonding shear strength sample according to claim 1, it is characterized in that described bonding is the method according to GB/T 22459.3-2008/ISO 13765-13765-3:2004, with the to be tested refractory wass of debugging to request for utilization denseness, three blocks of refractory brick are glued for entirety.

5. test a method of testing for refractory wass bonding shear strength sample, it is characterized in that the method for testing of described sample is:

Step one, by described samples dried, then measure the adhesive surface area of described sample;

Step 2, at ambient temperature, described sample is placed on the lower platen of pressure testing machine; Or in the center line both sides of lower platen parallel placement two pieces of strip plates, be placed on by described sample on two pieces of strip plates, the distance between the medial surface of two pieces of strip plates is the thickness sum of the adhesive surface of the width of middle refractory brick and two refractory wasses to be tested again; Or described sample is placed on the lower platen of the pressure testing machine in high temperature furnace;

Step 3, at ambient temperature, declines top board in the upper plane of described sample; Or place one piece of strip plate in the upper plane of the middle refractory brick of described sample, then top board is declined on described strip plate; Or by high temperature furnace ramp on request, arrive after requiring temperature and be incubated, after arriving temperature retention time, top board is declined in the upper plane of described sample;

Step 4, starting pressure testing machine, pressurize with the rate of loading of 0.9 ~ 1.1MPa/s, until the adhesive surface fracture of sample, maximum load during record fracture, namely obtains the normal temperature shearing strength of described refractory wass bonding or the high temperature shearing strength of refractory wass bonding.

6. test the method for testing of refractory wass bonding shear strength sample according to claim 5, it is characterized in that the area of described lower platen is 1 ~ 1.2 times of sample lower plane area.

7. test the method for testing of refractory wass bonding shear strength sample according to claim 5, it is characterized in that described top board is arranged on spheric seat, the area of top board is 1 ~ 1.2 times of the area of plane on sample.

8. test the method for testing of refractory wass bonding shear strength sample according to claim 5, it is characterized in that the length L2 of described strip plate is identical with the length L of described refractory brick, the width B 2 of described strip plate is 0.7 ~ 0.9 times of the width B of described refractory brick.