CN114323872A - Method for cold sealing mortar test piece - Google Patents
Method for cold sealing mortar test piece Download PDFInfo
- Publication number
- CN114323872A CN114323872A CN202210025734.XA CN202210025734A CN114323872A CN 114323872 A CN114323872 A CN 114323872A CN 202210025734 A CN202210025734 A CN 202210025734A CN 114323872 A CN114323872 A CN 114323872A
- Authority
- CN
- China
- Prior art keywords
- test piece
- mortar test
- mortar
- sealing
- sealing material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 98
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 68
- 238000007789 sealing Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000003566 sealing material Substances 0.000 claims abstract description 29
- 238000003825 pressing Methods 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000003822 epoxy resin Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 230000003487 anti-permeability effect Effects 0.000 claims 1
- 239000012188 paraffin wax Substances 0.000 abstract description 10
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- 235000014121 butter Nutrition 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000004568 cement Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
Abstract
The invention relates to the technical field of mortar impermeability test pieces, and provides a method for cold sealing a mortar test piece, which comprises the following steps: cleaning the side surface of the mortar test piece, and then smearing a sealing material solidified at normal temperature on the side surface of the mortar test piece to obtain a prepared mortar test piece; and pressing the prepared mortar test piece into a matched die sleeve, and curing the sealing material to obtain the mortar impermeability test piece capable of being tested on the machine. The mortar test piece adopted by the invention is a truncated cone, the diameter of the upper end surface of the truncated cone is 70mm, the diameter of the lower end surface of the truncated cone is 80mm, the height of the truncated cone is 32mm, the sealing material is a mixture of epoxy resin and a curing agent thereof, the mass ratio of the epoxy resin to the curing agent is 1:1, and the coating amount of the sealing material is 2.5-3.5g/70-80cm2. Compared with the prior art, the method provided by the invention is cold sealing, avoids heating paraffin and butter which are easy to generate pungent smell, is simple to operate, consumes short time, has good sealing effect, and improves the authenticity of the detection result.
Description
The application is a divisional application with application date of 2018, 11 and 12 months, application number of 201811338664.3 and invention name of 'a manufacturing method of a mortar impermeability test piece'.
Technical Field
The invention belongs to the technical field of mortar impermeability test pieces, and relates to a method for cold sealing a mortar test piece.
Background
In order to improve the waterproof function and durability of a concrete building structure, various waterproof technical specifications require that the concrete structure is waterproof by adding one or more waterproof materials besides the self-waterproof property of the concrete. At present, mortar impermeability is increasingly introduced as a determination standard for the quality of waterproof materials according to waterproof material detection standards, mortar impermeability tests require that water only permeates from the interior of a test piece but cannot seep out from the periphery of the test piece, otherwise, test results are not true, so how to seal the outer side of the mortar test piece becomes a key of impermeability tests, and the success or failure of the impermeability tests is directly influenced by the quality and the quality of the treatment in this link.
At present, no related technical patents are available for reference in the sealing method of the mortar impermeability test piece, and the conventional sealing method of the concrete impermeability test piece is basically adopted for sealing, and the most used method is a paraffin sealing method and a grease cement mixture sealing method.
(1) The paraffin method requires that paraffin is heated and melted firstly, then the melted paraffin is evenly smeared on the side surface of a test piece, and finally the test piece smeared with the paraffin is pressed into a mould. Test results show that the sealing method has very high requirements on temperature control, but has limited sealing effect, is easy to cause side leakage, and is troublesome to clean the die after die removal. Meanwhile, the sealing method needs to heat the paraffin and the test mold, so that testers are easily scalded, and meanwhile, the paraffin easily generates unpleasant smell and pollutes the environment.
(2) The sealing principle of the butter cement mixture requires that cement and butter are heated in an oven at 50-80 ℃ according to a certain proportion, the butter is melted and uniformly mixed with the cement, then the mixture is smeared on the outer side of a test piece, and the test piece smeared with the mixture is pressed into a mold. The results show that the sealing method can not completely solve the problem of side leakage, and the following defects mainly exist:
firstly, the cement is required to have no caking and be stirred as uniformly as possible, otherwise, a plurality of particles exist on the surface of a sealing layer, the coating is not uniform, and effective sealing cannot be formed to cause side leakage.
Secondly, the sealing material is essentially an oil-based sealing paste which is not solidified all the time, and has a certain sealing effect under low water pressure, but the sealing effect is difficult to ensure under the condition of high water pressure.
Thirdly, the method needs heating, and the butter can volatilize to generate pungent smell in the heating process, thereby polluting the environment.
And oil stains are brought to the testing machine and the die, and the cleaning is difficult.
Therefore, it is necessary to provide an effective sealing material and a simple and reliable sealing method.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for manufacturing a mortar impermeability test piece.
The purpose of the invention can be realized by the following technical scheme:
a manufacturing method of a mortar impermeability test piece comprises the following steps:
taking a mortar test piece, cleaning the side surface of the mortar test piece, and then coating a sealing material solidified at normal temperature on the side surface of the mortar test piece;
and (II) pressing the mortar test piece prepared in the step (I) into a matched sleeve die, and curing the sealing material to obtain the mortar impermeability test piece capable of being tested on a machine.
Furthermore, the mortar test piece is a circular truncated cone. The size of the truncated cone is preferably 70mm and 80mm in diameter of the upper end face and the lower end face, respectively, and 32mm in height.
Furthermore, the process of pressing the mortar test piece into the cover die in the step (II) is as follows: and (3) placing the mortar test piece on the sleeve die, pressing the mortar test piece and rotating until the mortar test piece is not rotated, and finally pressing the mortar test piece into the sleeve die to enable the mortar test piece to be flush with the bottom of the sleeve die. The purpose of pressing is to ensure that the test piece and the sleeve die are tightly attached to reduce gaps; the purpose of the rotary driving is to promote the sealing material to be filled more uniformly in the gap, so that the gap between the test piece and the sleeve die can be completely filled, water is prevented from seeping out of the gap, and the problem of peripheral seepage is solved. The pressing pressure is based on the fact that the lower surface of the test piece is flush with the port of the die sleeve, and under the normal condition, the weight of an adult with normal weight can be achieved without adopting a machine for pressing; the rotation does not need too large acting force, and the sleeve die and the test piece are pressed by both hands so as to enable the test piece to rotate normally.
Further, the sealing material is a mixture of high-cohesiveness and high-strength resin cured at normal temperature and a curing agent thereof.
Further, the sealing material is a mixture of an epoxy resin and a curing agent thereof. More preferably, in the sealing material, the addition mass ratio of the epoxy resin to the curing agent is 1: 1. When the mass ratio of the epoxy resin to the curing agent is not within the range defined by the invention, the adhesion between the sealing material and the test piece and the die sleeve is reduced due to too high or too low mass ratio, and once the adhesion is reduced, water penetrates through the adhesion weak layer under the high pressure condition in the experimental process to cause peripheral leakage. Particularly, when the dosage of the curing agent is low, the coating cannot be completely cured, and the adhesive force is reduced; the dosage of the curing agent is too high, the excessive curing agent can not participate in the crosslinking reaction, and the curing agent can not cure, so that the strength of the coating is reduced, and the adhesive force is reduced.
Further, in the step (two), the curing conditions are as follows: curing for 15-20 hours at normal temperature.
Furthermore, the coating amount of the sealing material is 2.5-3.5g/70-80cm2. The smearing amount of the sealing material is too low, an effective sealing layer cannot be formed between the test piece and the sleeve die, and side leakage can be generated; the coating amount of the sealing material is too high, and in the sealing process, redundant uncured sealing material flows to the surface of the test piece and covers the surface of the test piece, so that the test result is influenced.
Further, the process of cleaning the side surface of the mortar test piece specifically comprises the following steps: cleaning the side surface bulges and the particles by using a shovel blade, then washing the side surface bulges and the particles by using a hairbrush belt, and drying the side surface bulges and the particles in the air.
Compared with the prior art, the invention has the following advantages:
(1) the invention provides cold sealing, i.e. the sealing material and the die do not need heating treatment, the die is directly filled for sealing, the operation is very simple, and the sealing operation time is very short.
(2) The sealing method provided by the invention has a very good sealing effect, so that the authenticity of a final detection result is greatly improved, which is incomparable with a paraffin method and a grease cement mixture method.
(3) The invention avoids heating materials which are easy to generate pungent smell, such as paraffin, butter and the like, and plays a certain role in protecting the environment.
Detailed Description
The present invention will be described in detail with reference to specific examples. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
A manufacturing method of a mortar impermeability test piece comprises the following steps:
(I): taking a mortar test piece of a truncated cone with the diameters of the upper end surface and the lower end surface of 70mm and 80mm respectively and the height of 32mm, cleaning up projections and particles on the side surface of the test piece by using a scraper knife under the condition that the mortar test piece is wet, and washing the test piece by using a bristle brush with water to ensure that the side surface is smooth as far as possible; airing the test piece, and observing whether the side surface of the test piece is cleaned up or not in a dry state;
(II): uniformly mixing the epoxy resin and the curing agent thereof according to the mass ratio of 1:1 to prepare the epoxy resin
Sealing materials, then coating 3.0g of the sealing materials on each mortar test piece, and coating the sealing materials on the side surfaces of the mortar test pieces;
(III): putting the prepared mortar test piece into a sleeve die, pressing the top surface of the mortar test piece by hand and simultaneously rotating until the mortar test piece is not rotated, and finally, completely and tightly pressing the mortar test piece into the sleeve die by external force so that the mortar test piece is flush with the bottom of the sleeve die;
(IV): and (3) placing the test piece with the mold in a room temperature environment for 15-20 hours, and testing the test piece according to the specified requirements on a machine after the sealing material is cured to a certain degree and has certain strength.
Different sealing materials were modified and subjected to impermeability tests at different impermeability pressures according to the method of example 1, and the results are given in the following table.
TABLE 1 mortar impermeability test piece made of different sealing materials
Example 2
Most of them were the same as in example 1 except that the amount of the sealant applied was 2.5g in this example.
Example 3
Most of them were the same as in example 1 except that the amount of the sealant applied was 3.0g in this example.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (6)
1. A method for cold sealing a mortar test piece is characterized by comprising the following steps:
cleaning up projections and particles on the side surface of a mortar test piece of a cone by using a scraper knife, washing and drying the mortar test piece by using a brush with water, and observing whether the side surface of the mortar test piece is cleaned up or not in a dry state, wherein the diameter of the upper end surface of the mortar test piece of the cone is 70mm, the diameter of the lower end surface of the mortar test piece of the cone is 80mm, and the height of the mortar test piece is 32 mm;
and then smearing a sealing material solidified at normal temperature on the side surface of the mortar test piece to obtain the prepared mortar test piece, wherein the sealing material is a mixture of epoxy resin and a curing agent thereof, the adding mass ratio of the epoxy resin to the curing agent is 1:1, and the smearing amount of the sealing material is2.5 to 3.5g/70 to 80cm2；
And (II) pressing the prepared mortar test piece in the step (I) into a matched sleeve die, and curing the sealing material to obtain the mortar anti-permeability test piece capable of being tested on a machine, wherein the sealing material and the die are not subjected to heating treatment.
2. The method of cold sealing a mortar test piece according to claim 1, wherein the prepared mortar test piece is pressed into a sleeve mold as follows: putting the prepared mortar test piece into the sleeve die, pressing the top surface of the mortar test piece and rotating until the mortar test piece is not rotated; and completely pressing the mortar test piece into the die sleeve, wherein the lower surface of the mortar test piece is flush with the bottom of the die sleeve.
3. The method for manufacturing the mortar impermeability test piece of claim 2, wherein the mortar impermeability test piece is completely pressed into the die set without machine pressing.
4. The method for cold sealing a mortar test piece according to claim 1, wherein in step (two), the curing conditions are as follows: curing for 15-20 hours at normal temperature.
5. The method for cold sealing a mortar test piece according to claim 1, wherein in the step (one), the mortar test piece is in a wet state when the side surface of the mortar test piece is cleaned by the scraper knife.
6. The method of cold sealing a mortar test according to claim 1, wherein the brush is a bristle brush.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210025734.XA CN114323872A (en) | 2018-11-12 | 2018-11-12 | Method for cold sealing mortar test piece |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210025734.XA CN114323872A (en) | 2018-11-12 | 2018-11-12 | Method for cold sealing mortar test piece |
| CN201811338664.3A CN109540616A (en) | 2018-11-12 | 2018-11-12 | A kind of production method of mortar impervious test piece |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811338664.3A Division CN109540616A (en) | 2018-11-12 | 2018-11-12 | A kind of production method of mortar impervious test piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114323872A true CN114323872A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811338664.3A Pending CN109540616A (en) | 2018-11-12 | 2018-11-12 | A kind of production method of mortar impervious test piece |
| CN202210025734.XA Pending CN114323872A (en) | 2018-11-12 | 2018-11-12 | Method for cold sealing mortar test piece |
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| CN201811338664.3A Pending CN109540616A (en) | 2018-11-12 | 2018-11-12 | A kind of production method of mortar impervious test piece |
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| CN109540616A (en) * | 2018-11-12 | 2019-03-29 | 上海凯顿百森建筑材料科技发展有限公司 | A kind of production method of mortar impervious test piece |
| CN114197908A (en) * | 2020-09-18 | 2022-03-18 | 贵州省烟草公司遵义市公司汇川分公司 | Leakage-proof treatment method for roof of curing barn |
| CN112834299A (en) * | 2020-12-31 | 2021-05-25 | 中铁十八局集团有限公司 | Sealing material based on fly ash machine-made sand mortar impermeability test and use method thereof |
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- 2018-11-12 CN CN201811338664.3A patent/CN109540616A/en active Pending
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