CN108918387B - Test method for detecting impermeability of mortar - Google Patents
Test method for detecting impermeability of mortar Download PDFInfo
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- CN108918387B CN108918387B CN201810805615.XA CN201810805615A CN108918387B CN 108918387 B CN108918387 B CN 108918387B CN 201810805615 A CN201810805615 A CN 201810805615A CN 108918387 B CN108918387 B CN 108918387B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
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- 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
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- 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
- G01N1/36—Embedding or analogous mounting of samples
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- 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
- G01N1/38—Diluting, dispersing or mixing samples
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- 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
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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Abstract
The invention relates to a test method for detecting the impermeability of mortar, which comprises the steps of placing a cured mortar block to be tested into a standard laboratory, standing and drying for 0.5h, and uniformly coating the inner wall of an impermeability test mold with mixed sealant, wherein the thickness of the mixed sealant is 1-2 mm. And pressing the mortar block into the anti-seepage test mold by using a press machine to form the mortar block, so that colloid is extruded from the upper and lower gaps of the mortar block, and if the gap appears in the mortar block, coating operation is carried out again. And (3) the bottom surface of the mortar test block pressed into the mortar block is parallel to the bottom surface of the anti-permeability test die, the colloid extruded from the gaps between the upper surface and the lower surface of the mortar test block is scraped, and the mortar test block is placed in a laboratory for 2 hours for anti-permeability test. The mixed sealant is prepared by uniformly mixing an acetic silicone sealant and quick-hardening sulphoaluminate cement according to the weight ratio of 2: 1. The invention solves the problem of easy water leakage when detecting high pressure, optimizes the detection operation process and improves the detection effect and accuracy.
Description
Technical Field
The invention belongs to the technical field of building material performance testing, relates to a mortar detection technology, and particularly relates to a test method for detecting mortar impermeability.
Background
The anti-permeability performance of the waterproof mortar seriously influences the use effect of the waterproof mortar, and is particularly important for the anti-permeability performance test of the waterproof mortar to meet the use requirement. The seepage resistance pressure of the existing mortar with waterproof performance is generally more than 1.5MPa, the seepage resistance pressure of a mortar test piece 7d is required to be more than or equal to 1.5MPa according to the GB 23440-. The rosin paraffin method is very fast in solidification during coating, difficult to coat uniformly in operation and difficult to make uniform in thickness. The mortar test block is in rigid contact with the anti-seepage test die, the rosin paraffin liquid is poor in ductility when being pressed after being hardened, gaps are easy to generate, irregular gaps (gaps between the mortar test block and the anti-seepage test die due to irregularity of the mortar block) are difficult to seal by the paraffin after being hardened, the hardening time of the butter cement sealing method is long, more than 1d is generally needed, water leakage is difficult to achieve 1.5MPa, water leakage can occur between the mortar test block and the anti-seepage test die when the water pressure is high, and jet-shaped water columns can be generated seriously. The paraffin temperature in the prior art is not easy to control, the paraffin has poor sealing performance, the water leakage phenomenon can occur at the paraffin sealing position when the water pressure reaches about 0.6MPa, and the paraffin is solidified into solid after being coated on a test piece and is already solidified into a brittle material after being placed on a pressurizing machine, so that the paraffin has no ductility after being subjected to pressure, cannot well play a role in sealing irregular spaces, and cannot meet the requirement of actually detecting the impermeability of mortar.
Disclosure of Invention
The invention provides a test method for detecting the impermeability of mortar, which aims to solve the problem of easy water leakage during high pressure detection, optimize the detection operation process and improve the detection effect and accuracy.
The technical scheme of the invention is as follows: the test method for detecting the impermeability of the mortar comprises the steps of placing the maintained mortar block to be detected into a standard laboratory, standing and drying for 0.5h, and uniformly coating the inner wall of an impermeability test mold with mixed sealant, wherein the thickness of the mixed sealant is 1-2 mm. And pressing the mortar block into the anti-seepage test mold by using a press machine to form the mortar block, so that colloid is extruded from the gaps between the upper surface and the lower surface of the mortar block, and if the gaps in the mortar block appear, coating again. And the bottom surface of the mortar test block pressed into the mortar block is parallel to the bottom surface of the anti-permeability test die, the colloid extruded from the gaps between the upper surface and the lower surface of the mortar test block is scraped, and the anti-permeability test is carried out after the mortar test block is placed in a laboratory for 2 hours.
The mixed sealant is prepared by uniformly mixing an acetic silicone sealant and quick-hardening sulphoaluminate cement according to the weight ratio of 2: 1. The anti-permeability test die is of a cone structure, the diameter of an upper opening of the cone is 70mm, the diameter of a lower opening of the cone is 80mm, the height of the cone is 30mm, and the anti-permeability test die is made of a steel plate or an aluminum plate.
The impermeability test comprises the following steps:
the method comprises the steps of batching according to standard requirements, stirring mortar, filling an anti-seepage test mold once after uniformly stirring, forming and compacting on a vibrating table, scraping redundant mortar, and leveling to prepare 6 test pieces;
moisturizing and maintaining for 24 +/-2 hours in the environment with the temperature of 20 +/-3 ℃ and the relative humidity of 90-100%, maintaining in a maintenance water pool at the temperature of 20 +/-2 ℃ to the age of 7 days, and washing the surface;
filling the mixed sealant into an anti-seepage test mold after the surface is dried, and performing an anti-seepage water test after the mixed sealant is hardened; carrying out a hydrostatic test according to standard requirements, and gradually increasing the pressure in the test process: firstly, the water pressure is increased to 0.3MPa from 0.2MPa at a constant pressure for 2h, and then the water pressure is increased to 0.1MPa every 1 h; pressurizing to 1.5MPa, keeping the pressure constant for 1 hour, and stopping pressurizing when no water is permeated; and thirdly, taking the maximum pressure value of 4 samples without water seepage in each 6 samples as the anti-seepage pressure of the samples, and if more than 4 samples keep no water seepage for 1 hour when the pressure reaches 1.5MPa, the maximum anti-seepage pressure is more than or equal to 1.5 MPa.
According to GB 23440-.
According to the test method for detecting the mortar impermeability, the mixed sealant prepared from the silicone acetate sealant and the quick-hardening sulphoaluminate cement in the weight ratio of 2:1 is uniformly coated on the inner wall of the impermeability test mold, so that the problem of easy water leakage during high pressure detection is solved, the detection operation process is optimized, and the detection effect and accuracy are improved. The invention overcomes the defect that the prior art can not detect high water pressure, avoids high-temperature heating compared with a rosin paraffin method, has the advantages of convenient and quick operation, environmental protection, safety, complete sealing and easy cleaning, and is suitable for a test environment with high pressure of 1.5 MPa.
Drawings
FIG. 1 is a schematic view of a mold for testing mortar impermeability test;
wherein: a-mortar test block, b-mixed sealant, c-impervious test mould.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. The scope of protection of the invention is not limited to the embodiments, and any modification made by those skilled in the art within the scope defined by the claims also falls within the scope of protection of the invention.
The test method for detecting the impermeability of the mortar comprises the steps of uniformly mixing the acetic silicone sealant and the rapid hardening sulfate cement according to the weight ratio of 2:1 to prepare the mixed sealant. When the rapid hardening sulfate cement material is added into the silicone acetate sealant, the rapid hardening sulfate cement material is uniformly sprinkled on the colloid and added in two times, and the rapid hardening sulfate cement material and the silicone acetate sealant are uniformly mixed by wearing an environment-friendly acid-proof glove and repeatedly grasping the glove. And (3) placing the maintained mortar block to be tested into a standard laboratory, standing and drying for 0.5h, and wiping off the surface of the mortar block by using clear water. And (3) uniformly coating the mixed sealant b on the inner wall of the anti-permeability test die c, wherein the thickness of the mixed sealant is 1 mm. And then pressing the mortar block into the anti-seepage test mold by using a press machine to form a mortar test block 1, so that the bottom surface of the mortar test block is flush with the bottom surface of the anti-seepage test mold. As shown in figure 1, the anti-permeability test die c is of a cone structure, the diameter of an upper opening of the cone is 70mm, the diameter of a lower opening of the cone is 80mm, the height of the cone is 30mm, and the cone is surrounded by steel plates. And (3) extruding the colloid in the gaps at the upper and lower surfaces of the mortar test block, and if the colloid is not extruded in a part of gap areas, indicating that the colloid is not fully filled, coating operation is required to be carried out again when the colloid is not fully filled, so that the bottom surface of the mortar test block a pressed into the mortar test block is ensured to be parallel to the bottom surface of the anti-seepage test die c. The glue extruded from the gaps between the upper surface and the lower surface is scraped without inclining or rising, the glue is prevented from being coated on the upper surface and the lower surface of the mortar test block, if the glue is carelessly coated on the surface, the glue is removed by a knife, and the mortar layer is leaked. And scraping the colloid extruded from the gaps between the upper surface and the lower surface of the mortar test block, and after the colloid is completely treated, placing the mortar test block in a laboratory for 2 hours for an anti-permeability experiment.
The steps of the impermeability test are:
the method comprises the steps of batching according to standard requirements, stirring mortar, filling an anti-seepage test mold c once after uniformly stirring, forming and compacting on a vibrating table, scraping redundant mortar, and leveling to prepare 6 test pieces;
moisturizing and maintaining for 24 +/-2 hours in the environment with the temperature of 20 +/-3 ℃ and the relative humidity of 90-100%, maintaining in a maintenance water pool at the temperature of 20 +/-2 ℃ to the age of 7 days, and washing the surface;
filling the mixed sealant into an anti-seepage test mold c after the surface is dried, and performing an anti-seepage water test after the mixed sealant is hardened; the water pressure is gradually increased according to the standard requirement: firstly, the water pressure is increased to 0.3MPa from 0.2MPa at a constant pressure for 2h, and then the water pressure is increased to 0.1MPa every 1 h; secondly, in order to ensure that the mixed sealant completely meets the leakage-free requirement of 1.5MPa in the standard specification, the pressure is increased after the test water pressure is increased to 1.8MPa, the pressure is kept constant for 1 hour, and the pressure is not increased when water is not permeated; and thirdly, taking the maximum pressure value of 4 samples without water seepage in each 6 samples as the anti-seepage pressure of the samples, and if more than 4 samples keep no water seepage for 1 hour when the pressure reaches 1.5MPa, the maximum anti-seepage pressure is more than or equal to 1.5 MPa.
After the experiment is finished, the mortar block is lightly knocked out from the anti-seepage test mold by a hammer, and the colloid on the inner wall of the iron mold is cleaned by a wallpaper knife.
Table 1 shows the results of the mortar impermeability test using the mixed sealant of the present invention prepared from the silicone acetate sealant and the quick-setting sulfate cement. For comparison, table 1 lists the data of the mortar impermeability test performed by using paraffin wax mixed with rosin resin as sealant and butter mixed with cement as sealant in the prior art. The results in Table 1 show that the test method for detecting the impermeability of the mortar by using the silicone acetate sealant and the rapid hardening sulfate cement as the mixed sealant is superior to the test method in the prior art.
Table 1: anti-seepage pressure (MPa) of different sealing methods
| Osmotic pressure resistance, MPa | Paraffin and rosin resin | Butter and cement | Sealant and quick-hardening cement |
| 0.5 | Without leaking water | 5 of 6 blocks leak water | Without leaking water |
| 0.6 | 2 of 6 block leak water | 5 of 6 blocks leak water | Without leaking water |
| 0.7 | 4 of 6 blocks leak water | 6 blocks are totally leaked | Without leaking water |
| 0.8 | 5 of 6 blocks leak water | ---- | Without leaking water |
| 1.0 | 6 blocks are totally leaked | ---- | Without leaking water |
| 1.5 | ---- | ---- | Without leaking water |
| 1.8 | ----- | ---- | Without leaking water |
Claims (2)
1. A test method for detecting the impermeability of mortar is characterized by comprising the following steps: placing the well-maintained mortar block to be tested into a standard laboratory for standing and drying for 0.5h, and uniformly coating the inner wall of an anti-permeability test mold c with a mixed sealant b, wherein the thickness of the mixed sealant is 1-2 mm; the mixed sealant b is prepared by uniformly mixing an acetic silicone sealant and quick-hardening sulphoaluminate cement in a weight ratio of 2: 1; pressing the mortar block into the anti-seepage test mold by using a press machine to form a mortar test block a, so that colloid is extruded from gaps at the upper surface and the lower surface of the mortar test block, and if the gaps in the mortar test block appear, coating again; the bottom surface of the mortar test block pressed into the mortar block is parallel to the bottom surface of the anti-permeability test die, the colloid extruded from the gaps between the upper surface and the lower surface of the test block is scraped, and the anti-permeability test is carried out after the test block is placed in a laboratory for 2 hours; the impermeability test comprises the following steps:
the method comprises the steps of batching according to standard requirements, stirring mortar, filling an anti-seepage test mold c once after uniformly stirring, forming and compacting on a vibrating table, scraping redundant mortar, and leveling to prepare 6 test pieces;
moisturizing and maintaining for 24 +/-2 hours in the environment with the temperature of 20 +/-3 ℃ and the relative humidity of 90-100%, then putting the mixture into a maintenance pool with the temperature of 20 +/-2 ℃ for maintenance to the age of 7 days, and washing the surface clean;
filling the mixed sealant into an anti-seepage test mold c after the surface is dried, and performing an anti-seepage water test after the mixed sealant is hardened; carrying out a hydrostatic test according to standard requirements, and gradually increasing the pressure in the test process: firstly, the water pressure is increased to 0.3MPa from 0.2MPa at a constant pressure for 2h, and then the water pressure is increased to 0.1MPa every 1 h; pressurizing to 1.5MPa, keeping the pressure constant for 1 hour, and stopping pressurizing when no water is permeated; and thirdly, taking the maximum pressure value of 4 samples without water seepage in each 6 samples as the anti-seepage pressure of the samples, and if more than 4 samples keep no water seepage for 1 hour when the pressure reaches 1.5MPa, the maximum anti-seepage pressure is more than or equal to 1.5 MPa.
2. The test method for testing the mortar impermeability according to claim 1, which is characterized in that: the anti-seepage test die c is of a cone structure, the diameter of an upper opening of the cone is 70mm, the diameter of a lower opening of the cone is 80mm, the height of the cone is 30mm, and the cone is made of a steel plate or an aluminum plate.
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| CN109883925B (en) * | 2019-03-27 | 2024-02-13 | 武汉大学 | Variable-opening rough crack for visual experiment and manufacturing method thereof |
| CN111471427A (en) * | 2020-04-07 | 2020-07-31 | 衡水衡宝胶业有限公司 | Preparation method of TPIN bi-component sealant |
| IT202000016993A1 (en) * | 2020-07-13 | 2022-01-13 | Alice Berto | REINFORCED STRUCTURAL COMPONENT OR FLEXIBLE ROD |
| 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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| CN101149368A (en) * | 2007-11-13 | 2008-03-26 | 贵州中建建筑科研设计院 | Method for detecting solid concrete impermeability by core boring sampling |
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| CN103145380B (en) * | 2013-02-27 | 2014-12-10 | 同济大学 | Cement-based shrinkage-free joint filling sealing mortar for doors and windows and preparation method and construction method thereof |
| CN104402365B (en) * | 2014-10-28 | 2015-12-02 | 宁建树 | Aluminosulfate cement composition, preparation method and application thereof |
| CN105928755A (en) * | 2016-04-20 | 2016-09-07 | 上海建工材料工程有限公司 | Sealing method for impermeability test of concrete |
| CN106242445A (en) * | 2016-07-25 | 2016-12-21 | 秦文雄 | Environmental protection masonry mortar and production method thereof |
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| CN101149368A (en) * | 2007-11-13 | 2008-03-26 | 贵州中建建筑科研设计院 | Method for detecting solid concrete impermeability by core boring sampling |
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| 高渗流状况下的深基坑降水施工技术研究;刘博峰 等;《特种结构》;20161231;第33卷(第6期);第109页第2.1节 * |
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