CN112595648A - Device and method for detecting seepage failure ratio degradation quality of core sample of plastic concrete wall - Google Patents
Device and method for detecting seepage failure ratio degradation quality of core sample of plastic concrete wall Download PDFInfo
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- CN112595648A CN112595648A CN202011464035.2A CN202011464035A CN112595648A CN 112595648 A CN112595648 A CN 112595648A CN 202011464035 A CN202011464035 A CN 202011464035A CN 112595648 A CN112595648 A CN 112595648A
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- G—PHYSICS
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- 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
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- 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
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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Abstract
The invention discloses a device and a method for detecting the permeability-failure ratio degradation quality of a core sample of a plastic concrete wall. The device for detecting the permeability failure rate degradation quality of the core sample of the plastic concrete wall comprises a test piece cabin and a permeability driving component; the test piece cabin is used for containing a fixed core sample test piece and comprises a test piece cabin main body; the test piece cabin main body is of a cylindrical structure with two open ends and is provided with a side wall and a first accommodating cavity formed by enclosing the side wall, a core sample test piece placing area and an impervious adhesive filling area are arranged in the first accommodating cavity, and the impervious adhesive filling area is positioned between the core sample test piece placing area and the side wall; the infiltration drive assembly is used for connecting in the one end of test piece cabin to water pressure is applyed to the core appearance test piece that holds in the test piece cabin, detects with the specific drop of infiltration destruction. The device for detecting the permeability failure specific degradation quality of the core sample of the plastic concrete wall has the advantages of high detection accuracy, good reliability, simple operation, high detection efficiency and low detection cost.
Description
Technical Field
The invention relates to the technical field of wall performance detection, in particular to a device and a method for detecting the permeability failure ratio degradation quality of a core sample of a plastic concrete wall.
Background
The plastic concrete has mechanical property and deformation property between those of the concrete and the common concrete. The elastic modulus is similar to that of the foundation, and the concrete diaphragm wall has higher flexibility and can better adapt to the deformation of the foundation, so that the plastic concrete diaphragm wall can bear the force with the foundation in a combined manner and has the limit deformation which is much larger than that of common concrete, and therefore, the concrete diaphragm wall has better anti-cracking and anti-seismic capabilities; the anti-seepage performance is good, and the seepage amount of the anti-seepage wall is effectively reduced; secondly, the concrete has good workability, longer final setting time and lower strength, so that the concrete has the advantages of better construction and easy operation; in addition, proper cohesive soil is doped in the mixing proportion, so that the dosage of cement is reduced, the anti-permeability performance is improved, and the investment of the anti-permeability wall is greatly reduced. The plastic concrete impervious wall can be widely popularized and applied in the domestic and foreign water and hydropower engineering.
The plastic concrete impervious wall bears large water head difference before and after the plastic concrete impervious wall, and the water head difference can cause seepage failure, so that a seepage failure rate reduction test of the plastic concrete impervious wall is required in engineering application to determine the allowable seepage rate reduction. However, no effective detection method for the plastic concrete cut-off wall osmotic damage ratio drop exists at present, and the detection time of the plastic concrete cut-off wall osmotic damage ratio drop is generally longer by adopting the existing detection method, the osmotic water pressure of the osmotic damage is larger, the long-time fixing stability of test piece detection equipment is difficult to ensure under the water pressure condition, the detection difficulty of the plastic concrete cut-off wall osmotic damage ratio drop is increased, and the detection accuracy is difficult to ensure.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a device and a method for detecting the permeability failure ratio degradation quality of a core material of a plastic concrete wall.
The invention provides a quality detection device for the penetration destruction ratio degradation of a core sample of a plastic concrete wall, which comprises:
the test piece cabin is used for containing and fixing the core sample test piece; the test piece cabin comprises a test piece cabin main body, wherein the test piece cabin main body is of a cylindrical structure with two open ends and is provided with a side wall and a first accommodating cavity formed by enclosing the side wall, a core sample test piece placing area and an impervious adhesive filling area are arranged in the first accommodating cavity, and the impervious adhesive filling area is positioned between the core sample test piece placing area and the side wall;
and the infiltration driving assembly is connected to one end of the test piece cabin and used for applying water pressure to the core sample test piece held in the test piece cabin so as to carry out infiltration destruction gradient detection.
The device for detecting the permeability-failure ratio degradation quality of the core sample of the plastic concrete wall provided by the embodiment of the invention at least has the following beneficial effects: according to the device for detecting the permeability-failure degradation ratio of the core sample of the plastic concrete wall, the impervious adhesive filling area is arranged in the test piece cabin main body, so that when a detection test is carried out, the core sample test piece is firstly arranged in the core sample test piece placing area, and then the impervious adhesive (such as cement mortar) is filled in the impervious adhesive filling area, so that the core sample test piece is bonded with the side wall of the test piece cabin main body through the impervious adhesive, and the firmness of the core sample test piece fixed in the test piece cabin is enhanced; in addition, through the mode, the core sample test piece is fixedly formed and tested in the same set of test die, damage to the core sample test piece during die stripping and press-in tests can be avoided, leakage between the core sample test piece and the test piece die is further caused, and accuracy of a detection result is improved. By last, the quality detection device that falls is destroyed than falling in plastic concrete wall body core appearance infiltration more than adopting can be used to the quality detection that plastic concrete wall body core appearance infiltration destroys than falling, detects the accuracy height, and the good reliability, easy and simple to handle, duration is short, and is efficient, and the water consumption is few, uses manpower sparingly, material resources, detects with low costs.
According to some embodiments of the invention, the specimen capsule body has a constriction thereon, the constriction having a first end and a second end, the first end having a larger opening than the second end.
According to some embodiments of the invention, the osmotic drive module comprises:
the water pressing cabin is connected to one end, close to the first end, of the test piece cabin in a sealing mode, a second accommodating cavity is formed inside the water pressing cabin, and the second accommodating cavity is communicated with the first accommodating cavity;
the water pump is communicated with the second accommodating cavity through a water inlet pipe, and a pressure gauge is arranged on the water inlet pipe.
According to some embodiments of the invention, the test piece cabin further comprises a partition plate, the partition plate is arranged between the test piece cabin main body and the water pressing cabin, and a through hole is formed in the partition plate at a position corresponding to the core sample test piece placing area.
According to some embodiments of the invention, a supporting member is further disposed on the partition board at a position corresponding to the core sample test piece placement area, and is used for supporting the core sample test piece away from the partition board in a suspended manner in the core sample test piece placement area when the core sample test piece is placed.
According to some embodiments of the invention, the specimen capsule body is a truncated cone-shaped cylindrical structure with openings at both ends.
According to some embodiments of the invention, the device further comprises a water seepage observation cover, wherein the water seepage observation cover is arranged at one end of the test piece cabin, which is far away from the connection end of the infiltration driving component; and a water outlet is arranged on the water seepage observation cover.
According to some embodiments of the invention, the water outlet is connected to a water inlet of the water supply device.
The second aspect of the invention provides a quality detection method for the permeability-destruction ratio degradation of a core material of a plastic concrete wall, which adopts any one of the quality detection devices for the permeability-destruction ratio degradation of the core material of the plastic concrete wall provided by the first aspect of the invention, and the specific detection method comprises the following steps:
s1, loading a core sample test piece into a core sample test piece placing area of the test piece cabin main body, then filling an impervious adhesive into the impervious adhesive filling area, and drying to solidify and bond the impervious adhesive with the core sample test piece and the side wall;
s2, hermetically connecting the penetration driving assembly with the test piece cabin, applying preset water pressure to the core sample test piece held in the test piece cabin, and keeping the water pressure stable;
s3, after water seepage occurs on the surface of one side of the core sample test piece, which is far away from the connecting end of the penetration driving component on the test piece cabin, continuously pressurizing for 48-72 hours, observing the water seepage condition of the surface of one side of the core sample test piece, which is far away from the connecting end of the penetration driving component on the test piece cabin, if piping and soil and sand flow occur, judging that the core sample test piece is subjected to penetration damage, otherwise, the core sample test piece is not subjected to penetration damage;
s4, if the core sample test piece is subjected to osmotic damage, testing and recording the water head difference of the two end faces of the core sample test piece, stopping the test, and then calculating the osmotic damage gradient of the core sample test piece according to the osmotic damage gradient equal to the ratio of the water head difference of the two end faces of the core sample test piece to the height of the core sample test piece; and if the core sample test piece is not subjected to the osmotic damage, increasing the water pressure, continuing the test according to the operation of the step S3, repeating the operation until the core sample test piece is subjected to the osmotic damage, testing and recording the water head difference of the two end surfaces of the core sample test piece, stopping the test, and then calculating the osmotic damage ratio drop of the core sample test piece.
According to some embodiments of the present invention, step S1 specifically includes:
preprocessing a core sample test piece, comprising: placing the core sample test piece in a curing room, curing for 1-20 days, taking out, covering the surface of the core sample test piece with a wet towel after wringing, and standing until the surface is dry; then smearing cement paste on the side surface of the core sample test piece;
secondly, loading the core sample test piece processed in the first step into a core sample test piece placing area, and arranging a template on the surface of one side of the core sample test piece, which is far away from the connecting end of the penetration driving assembly on the test piece cabin; filling an anti-permeability binder into the cement mortar filling area until the anti-permeability binder is flush with the surface of one side of the test piece far away from the connecting end of the penetration driving assembly on the test piece cabin, and covering the surfaces of the core sample test piece and the filled anti-permeability binder with a template; arranging templates on two sides to enable the filled impervious adhesive to be flush with the surfaces of the two sides of the core sample test piece, and removing the templates after arranging the templates on the two sides for 36-72 hours; and then placing the mixture in a curing room for curing for 7-28 days.
Drawings
The invention is further described with reference to the following figures and examples, in which:
fig. 1 is a schematic structural diagram of a device for detecting the permeability-breakdown ratio degradation quality of a core sample of a plastic concrete wall body according to an embodiment of the invention.
Reference numerals: 11-test piece cabin body, 12-side wall, 13-first containing cavity, 14-core sample test piece placing area, 15-impervious adhesive filling area, 16-first end, 17-second end, 21-water pressing cabin, 22-water pump, 23-water inlet pipe, 24-pressure gauge, 25-second containing cavity, 30-water seepage observation cover, 31-water outlet, 40-seepage water collecting container and 50-core sample test piece.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to, for example, the upper, lower, etc., is indicated based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.
In the description of the present invention, unless otherwise explicitly defined, terms such as arrangement, connection and the like should be broadly construed, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the detailed contents of the technical solutions.
Reference throughout this specification to "one embodiment," "some embodiments," or similar language means that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Referring to fig. 1, fig. 1 is a schematic structural diagram of the apparatus for detecting the core sample penetration destruction ratio degradation of the plastic concrete wall of the present invention, and fig. 1 is a schematic structural diagram of a test piece cabin in which a core sample test piece is placed and an impervious adhesive cement mortar is filled, but the core sample test piece and the filled cement mortar may not be structural components of the apparatus for detecting the core sample penetration destruction ratio degradation of the plastic concrete wall of the present embodiment. As shown in figure 1, the device for detecting the permeability-breakdown degradation ratio of the core sample of the plastic concrete wall comprises a test piece cabin and a permeability driving assembly. The test piece cabin is used for containing and fixing a core sample test piece 50, the test piece cabin comprises a test piece cabin main body 11, the test piece cabin main body 11 is a tubular structure with two open ends, the test piece cabin has a side wall 12 and a first containing cavity 13 formed by enclosing the side wall 12, a core sample test piece placing area 14 and an impervious adhesive filling area 15 are arranged in the first containing cavity 13, the core sample test piece placing area 14 is used for placing the core sample test piece 50, the impervious adhesive filling area 15 is positioned between the core sample test piece placing area 14 and the side wall 12 and is used for filling the impervious adhesive, and the impervious adhesive can be cement mortar or a high polymer material solidified at normal temperature; the infiltration driving assembly is used for being connected to one end of the test piece cabin and applying water pressure to the core sample test piece 50 held in the test piece cabin main body 11 so as to carry out an infiltration destruction degradation ratio quality detection test.
According to the device for detecting the permeability-damage ratio degradation quality of the core sample of the plastic concrete wall, the impervious adhesive filling area 15 is arranged in the sample cabin main body 11, so that when a detection test is carried out, the core sample test piece 50 can be firstly arranged in the core sample test piece placing area 14, then the impervious adhesive filling area 15 is filled with the impervious adhesive, the core sample test piece 50 and the side wall 12 of the sample cabin main body 11 are bonded and fixed through the impervious adhesive, and the firmness of the core sample test piece 50 fixed in the sample cabin is enhanced; in addition, the water seepage is not generated at the position outside the core sample test piece 50 during the detection test, so that the test result is prevented from being influenced; in addition, through the mode, the core sample test piece is fixedly formed and tested in the same set of test die, damage to the core sample test piece 50 during die stripping and press-in tests can be avoided, leakage between the core sample test piece 50 and a test piece die is further caused, and accuracy of a detection result is improved.
In the embodiment, the impervious adhesive filling area 15 in the first accommodating cavity 13 is located between the core sample test piece placing area 14 and the side wall of the test piece cabin main body 11, and is arranged around the core sample test piece placing area 14; specifically, the core sample placing area 14 may be disposed in the middle of the first receiving cavity 13. When the core sample test piece placing area 14 is used, after the core sample test piece 50 is placed in the core sample test piece placing area 14, the anti-seepage adhesive filling area 15 around the core sample test piece 50 is filled with the anti-seepage adhesive, and the anti-seepage adhesive can be cement mortar, and generally low-seepage water-based cement mortar is adopted, so that water seepage is not generated at positions outside the core sample test piece 50 in a detection test, and the test result is prevented from being influenced.
To improve the stability of the fixing of the core specimen 50, the specimen capsule body 11 may be designed to have a constricted section having a first end and a second end, the opening of the first end being larger than the opening of the second end. Through set up the shrinkage section on test piece cabin main part 11, when the detection test, can connect infiltration drive assembly in the test piece cabin near one side of the first end of shrinkage section (big opening end), in order to exert water pressure from this side through infiltration drive assembly, then test piece cabin main part has the shrinkage section on the water pressure direction of edge, when the water pressure is applyed in the testing process, the slope lateral wall of shrinkage section can hinder test piece under-deck core appearance test piece 50 of test piece and release the test piece cabin by the water pressure effect on test piece cabin main part 11, improve the fixed stability of core appearance test piece 50, guarantee the quality detection and the accuracy of infiltration destruction than falling. In the present embodiment, the test piece compartment main body 11 is a truncated cone-shaped cylindrical structure with two open ends, which is a necking structure, and can be regarded as having a contraction section, and has a first end 16 and a second end 17, wherein the opening of the first end 16 is larger than that of the second end 17. The inclination angle of the side wall of the truncated cone-shaped cylindrical test piece cabin body 11 can be designed to be 5-15 degrees, and the deviation between the maximum opening diameter and the minimum opening diameter is within 10 mm. Of course, in other embodiments, the test piece chamber main body 11 may be designed to have other structures with a contraction section in the water pressure direction, such as a gourd-shaped cylindrical structure. In this embodiment, the test piece compartment main body 11 has a height of 150mm, a maximum opening diameter of 170mm, and a minimum opening diameter of 180mm, and the test piece compartment main body 11 may be made of stainless steel, carbon steel, cast iron, copper material, plastic, wood, or cement-based material.
In this embodiment, the osmotic drive module includes a pressurized water tank 21 and a water pump 22; the pressing cabin 21 is used for being hermetically connected to one end, close to the first end 16 of the contraction section, of the test piece cabin, a second accommodating cavity 25 is formed inside the pressing cabin 21, and the second accommodating cavity 25 is communicated with the first accommodating cavity 13; the water pump 22 is communicated with the second accommodating cavity 25 through a water inlet pipe 23, and a pressure gauge 24 is arranged on the water inlet pipe 23; the water pressing cabin 21 and the test piece cabin can be connected in a sealing mode through threaded holes and bolts. When the test device is used, water can be pumped to the second accommodating cavity 25 on the water pressing cabin 21 communicated with the first accommodating cavity 13 through the water pump 22, so that water pressure is applied to the core sample test piece 50 which is fixedly arranged in the core sample test piece placing area 14 of the first accommodating cavity 13, and a permeability-destruction degradation quality detection test is carried out. For ease of operation, the osmotic engine may also include a water reservoir to which the water pump 22 is connected via a water line.
In addition, the pressurized water tank 21 may be provided with an exhaust port, and an exhaust valve is provided on the exhaust port. Before beginning to detect, can open the discharge valve on the gas vent earlier, then open water pump 22, to the pumping in pressurized water cabin 21, through the air in gas vent discharge inlet tube 23 and the pressurized water cabin 21 simultaneously, the pressurized water cabin 21 is filled with water and then closes discharge valve at that time, continues to apply water pressure and carries out the testing, can improve the accuracy that detects from this.
In some embodiments, the test piece chamber may further include a partition plate disposed between the test piece chamber main body 11 and the pressurized-water chamber 21, and the partition plate is provided with a through hole corresponding to the core sample test piece placement region 14. Through the structure setting, the impervious adhesive filling area 15 close to one end of the water pressing cabin 21 on the test piece cabin can be plugged through the partition plate, and the impervious adhesive can be directly filled in the test piece cabin during a detection test, so that the operation is simple and convenient. The size of the through holes on the partition plate can be designed to be smaller than or equal to the core sample test piece placing area 14, and the specific size and the number of the through holes can be designed according to the situation.
In addition, in order to facilitate the improvement of the accuracy of the action of the water pressure in the pressurized water tank 21 on the core sample test piece 50 in the test piece tank, a support piece can be further arranged on the partition plate corresponding to the core sample test piece placing area 14, the core sample test piece 50 is separated from the partition plate and supported in the core sample test piece placing area 14 in a suspension mode when the core sample test piece 50 is placed, and then the water can enter and fill the space below the core sample test piece 50 through the through hole during the test, so that the water pressure is applied to the core sample test piece 50. Specifically, in some embodiments, a plurality of through holes may be provided on the spacer at positions corresponding to the core sample specimen placing areas 14, and a support member may be provided on the spacer between the through holes. In addition, in order to prevent the core sample test piece 50 from being suspended in the core sample test piece placement area 14, when the impervious adhesive is filled, cement mortar falls into a space below the core sample test piece 50, which affects the accuracy of detection, the support member can be designed as a blocking support member, the blocking support member is surrounded at the edge of the core sample test piece placement area 14, and is used for separating the core sample test piece 50 from the partition plate to be suspended in the core sample test piece placement area 14 when the core sample test piece 50 is placed, and blocking the impervious adhesive from entering the core sample test piece placement area 14 when the impervious adhesive is filled.
In order to facilitate the observation of the seepage water, the device for detecting the seepage failure ratio degradation of the core sample of the plastic concrete wall further comprises a seepage observation cover 30, the seepage observation cover 30 is arranged at one end, close to the second end 17 of the contraction section, of the test piece cabin, and a water outlet 31 is formed in the seepage observation cover 30. The water seepage observation cover 30 and the test piece cabin can be hermetically connected through a threaded hole and a bolt, and the water seepage observation cover 30 can be an organic glass observation cover. In addition, in order to facilitate the collection of the permeated water, a permeated water collecting container 40 may be further designed, and the permeated water collecting container 40 is connected to the water outlet 31 of the permeated water observing cover 30.
The device for detecting the permeability failure rate degradation of the core sample of the plastic concrete wall can be used for detecting the permeability failure rate degradation of the impervious wall, particularly for detecting the permeability failure rate degradation of the core sample of the plastic concrete wall, and correspondingly, the core sample test piece 50 is a plastic concrete test piece. For example, the seepage failure ratio degradation quality detection device for the plastic concrete wall core sample shown in fig. 1 can be used for detecting the seepage failure ratio degradation quality of the impervious wall, and the specific detection method comprises the following steps:
s1, the core sample test piece 50 is placed in the core sample test piece placement area 14 of the test piece cabin main body 11, a template is arranged on the surface of one side, away from the connecting end of the penetration driving assembly on the test piece cabin, of the core sample test piece 50, then the penetration-resistant adhesive filling area 15 is filled with the penetration-resistant adhesive, and the penetration-resistant adhesive is dried to be solidified and bonded with the core sample test piece 50 and the side wall 12.
Specifically, a solid core sample can be firstly taken on the impervious wall body, the solid core sample can be cylindrical, the diameter is 60-120 mm, the length is 120-250 mm, and solid core samples in other shapes can be taken certainly; then, cutting and grinding the solid core sample to obtain a core sample test piece 50, wherein if the cylindrical solid core sample is taken, the diameter of the test piece after cutting and grinding can be 60-120 mm, the length of the test piece can be 100-150 mm, and the flatness of two end faces of the core sample test piece 50 is 0-3 mm; pretreating the core sample test piece 50, specifically, placing the core sample test piece 50 in a concrete standard curing room, and curing for 1-20 days according to the standard of ordinary concrete mechanical property experimental method (GB/T50081-2002), wherein the concrete standard curing room can be cured by water mist, the temperature is 20-5 ℃, and the humidity is not less than 95%; taking out after the maintenance is finished, covering the surface of the core sample test piece 50 with a wet towel after wringing, and standing until the surface is dry; then stirring cement paste, uniformly coating the cement paste on the side surface of the core sample test piece 50, covering two end surfaces of the core sample test piece 50 with films with the same size as the end surfaces, placing the covered end surfaces in a core sample test piece placing area 14 of the test piece cabin main body 11, removing the films, pouring an anti-permeability adhesive in a gap between the core sample test piece 50 and the side wall 12 of the test piece cabin main body 11, and manually vibrating under the condition that the anti-permeability adhesive is inserted and tamped by a steel tamping bar to keep the core sample test piece 50 immovable so as to enable the filled anti-permeability adhesive to be compact; filling the core sample 50 with the impervious adhesive, leveling the core sample by pressing, covering the core sample 50 and the surface of the filled impervious adhesive by using a template, removing the template after 36-72 hours, and then placing the core sample 50 and the surface of the filled impervious adhesive in a standard concrete curing room for curing for 7-28 days.
The cement paste smeared on the surface of the core sample test piece 50 has a water-to-cement ratio of 0.25-0.35, and the gel material comprises cement, slag powder, silica fume, fly ash, a water reducing agent and organic fibers; wherein the slag powder mixing amount is 0-50% of the mass of the cementing material; the mixing amount of the silica fume is 0-12% of the mass of the cementing material; the blending amount of the fly ash is 0-25% of the mass of the cementing material; the mixing amount of the water reducing agent is 0-2.5% of the mass of the cementing material; the mixing amount of the organic fibers is 0-0.5 per mill of the mass of the cementing material. The cement paste is smeared on the side surface of the core sample test piece 50, so that the interface bonding between the core sample test piece 50 and the filled cement paste can be improved, and the interface penetration is effectively avoided.
The impervious adhesive filled in the impervious adhesive filled area 15 can be cement mortar, and low-permeability cement mortar is generally adopted. The mortar-sand ratio of the cement mortar can be 1: 0.5-1: 3, the amount of the sand is 1350-1550 kg/m3(ii) a The water-to-gel ratio can be 0.25-0.35, and the gel material comprises cement, slag powder, silica fume, fly ash, a water reducing agent and organic fibers; wherein the slag powder mixing amount is 0-50% of the mass of the cementing material; the mixing amount of the silica fume is 0-12% of the mass of the cementing material; the blending amount of the fly ash is 0-25% of the mass of the cementing material; the mixing amount of the water reducing agent is 0-2.5% of the mass of the cementing material; the mixing amount of the organic fibers is 0-0.5 per mill of the mass of the cementing material.
The cement used by the cement paste and the cement mortar can adopt any one or more of ordinary portland cement, fly ash portland cement, slag portland cement, moderate-heat portland cement, low-heat portland cement and composite portland cement; the cement strength grade is any one or more of 32.5, 32.5R, 42.5R, 52.5 and 52.5R.
The total alkali content of the silica fume is not more than 1.5%, the silicon dioxide content is not less than 85%, the chlorine content is not more than 0.1%, the water content (powder material) is not more than 3.0%, the solid content (liquid material) production control value is +/-2.0%, the ignition loss is not more than 4.0%, the water demand ratio is not more than 125%, the specific surface area (BET method) is not less than 15m2/kg, the activity index (7-day rapid method) is not less than 105%, the 14-day expansion rate reduction value for inhibiting the reactivity of the alkali aggregate is not less than 35%, and the ratio of the electric flux of the chlorine ion permeability resistance is not more than 40% in 28 days.
The fly ash is I-grade and/or II-grade fly ash. The slag powder is S95 and/or S105 grade slag powder. The water reducing agent is one or more of lignosulfonate water reducing agents, naphthalene water reducing agents, melamine water reducing agents, sulfamate water reducing agents, fatty acid water reducing agents and polycarboxylic acid water reducing agents. The water is one or more of natural water, tap water and reclaimed water. The organic fiber is one or more of polypropylene fiber, polyacrylonitrile fiber, polyester fiber, polyvinyl alcohol fiber and aramid fiber. The sand is one or more of river sand and artificial sand.
And S2, hermetically connecting the infiltration driving assembly with the test piece cabin, applying preset water pressure to the core sample test piece 50 held in the test piece cabin, and keeping the water pressure stable.
Specifically, a water pressing cabin 21 can be hermetically connected with one end, close to the first end 16 of the contraction section, of the test piece cabin, and water is pumped into a first accommodating cavity 13 of the test piece cabin through a water pump 22, so that the water pressing cabin is filled with water; and pumping water continuously according to the preset water pressure, keeping the water pressure in the pressurized-water cabin stable, wherein the water pressure in the pressurized-water cabin is within +/-5% of the preset pressure.
S3, continuously pressurizing for 48-72 hours after water seepage occurs on the surface of one side, far away from the connecting end of the penetration driving assembly on the test piece cabin, of the core sample test piece 50, observing the water seepage condition of the surface, far away from the connecting end of the penetration driving assembly on the test piece cabin, of the core sample test piece 50, judging that the core sample test piece 50 is subjected to penetration damage if piping, soil flowing and sand flowing phenomena occur, and otherwise, judging that the core sample test piece 50 is not subjected to penetration damage.
S4, if the core sample test piece 50 is subjected to osmotic damage, testing and recording the water head difference of the two end faces of the core sample test piece 50, stopping the test, and then calculating the osmotic damage ratio drop of the core sample test piece 50 according to the osmotic damage ratio drop equal to the ratio of the water head difference of the two end faces of the core sample test piece 50 to the height of the core sample test piece 50; if the core sample specimen 50 is not subjected to the osmotic damage, increasing the water pressure, continuing the test according to the operation of the step S3, repeating the steps until the core sample specimen 50 is subjected to the osmotic damage, testing and recording the water head difference of the two end surfaces of the core sample specimen 50, stopping the test, and then calculating the osmotic damage ratio drop of the core sample specimen 50. The test may also be terminated if the reduction in the osmotic damage ratio of the test is already greater than the test value required by the design.
The water head difference of two end surfaces (top and bottom surfaces) of the core sample specimen 50 is a test water head with the unit of mm water column and the test water head is 1 multiplied by 104～1×105mm water column. If the osmotic driving assembly is adopted to pump water by using the water pump, the adopted water pump can ensure that the test water head reaches 4 multiplied by 104～1.5×105And m is selected. The penetration destruction rate is the ratio of the test water head to the height of the test piece when the test piece is subjected to penetration destruction, and the units of the test water head and the height of the test piece can be mm.
In order to improve the detection accuracy, a plurality of parallel (such as 3, 5 or 6 parallel test pieces) can be arranged in each group of test, and the average value of the permeability-breaking ratio drops measured by each parallel core sample test piece is used as the test result. The penetration breakdown ratio drop of each core sample piece can be accurate to 0.1.
By adopting the method for detecting the permeability failure ratio degradation of the core sample of the plastic concrete wall, the detection accuracy is high, the reliability is good, the process is simple, the duration is short, the operation is convenient, the detection efficiency is high, the water consumption is low, the manpower and the material resources are saved, and the quality detection cost is reduced.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. The utility model provides a plastic concrete wall core appearance infiltration destruction falls quality detection device which characterized in that includes:
the test piece cabin is used for containing and fixing the core sample test piece; the test piece cabin comprises a test piece cabin main body, wherein the test piece cabin main body is of a cylindrical structure with two open ends and is provided with a side wall and a first accommodating cavity formed by enclosing the side wall, a core sample test piece placing area and an impervious adhesive filling area are arranged in the first accommodating cavity, and the impervious adhesive filling area is positioned between the core sample test piece placing area and the side wall;
and the infiltration driving assembly is connected to one end of the test piece cabin and used for applying water pressure to the core sample test piece held in the test piece cabin so as to carry out infiltration destruction gradient detection.
2. The apparatus of claim 1, wherein the specimen capsule body has a constricted section with a first end and a second end, the first end having a larger opening than the second end.
3. The apparatus for detecting the specific degradation of core-like infiltration damage of wet concrete wall according to claim 2, wherein the infiltration driving module comprises:
the water pressing cabin is connected to one end, close to the first end, of the test piece cabin in a sealing mode, a second accommodating cavity is formed inside the water pressing cabin, and the second accommodating cavity is communicated with the first accommodating cavity;
the water pump is communicated with the second accommodating cavity through a water inlet pipe, and a pressure gauge is arranged on the water inlet pipe.
4. The apparatus for detecting the infiltration destruction rate degradation quality of the core sample of the plastic concrete wall body as claimed in claim 3, wherein the test piece cabin further comprises a partition plate, the partition plate is arranged between the test piece cabin body and the water pressing cabin, and a through hole is arranged on the partition plate corresponding to the position of the core sample test piece placing area.
5. The apparatus for detecting the infiltration destruction degradation ratio of the core sample of the plastic concrete wall body as claimed in claim 4, wherein a support member is further disposed on the partition plate at a position corresponding to the placement area of the core sample test piece, and is used for supporting the core sample test piece away from the partition plate in a suspended manner in the placement area of the core sample test piece when the core sample test piece is placed.
6. The apparatus for detecting the infiltration destruction degradation ratio of a plastic concrete wall core sample according to claim 1, wherein the test piece cabin main body is a truncated cone-shaped cylindrical structure with openings at two ends.
7. The apparatus for detecting infiltration destruction specific degradation of a core sample of a plastic concrete wall according to any one of claims 1 to 6, further comprising a water seepage observation cover arranged at one end of the test piece cabin away from the connection end of the infiltration driving component; and a water outlet is arranged on the water seepage observation cover.
8. The apparatus for detecting the specific degradation of core-like infiltration failure rate of wet concrete wall according to claim 7, further comprising a water seepage collection container connected to the water outlet.
9. A detection method for the seepage failure ratio degradation quality of a core sample of a plastic concrete wall is characterized in that the detection device for the seepage failure ratio degradation quality of the core sample of the plastic concrete wall disclosed by any one of claims 1 to 8 is adopted, and the detection method comprises the following steps:
s1, loading a core sample test piece into a core sample test piece placing area of the test piece cabin main body, then filling an impervious adhesive into the impervious adhesive filling area, and drying to solidify and bond the impervious adhesive with the core sample test piece and the side wall;
s2, hermetically connecting the penetration driving assembly with the test piece cabin, applying preset water pressure to the core sample test piece held in the test piece cabin, and keeping the water pressure stable;
s3, after water seepage occurs on the surface of one side of the core sample test piece, which is far away from the connecting end of the penetration driving component on the test piece cabin, continuously pressurizing for 48-72 hours, observing the water seepage condition of the surface of one side of the core sample test piece, which is far away from the connecting end of the penetration driving component on the test piece cabin, if piping and soil and sand flow occur, judging that the core sample test piece is subjected to penetration damage, otherwise, the core sample test piece is not subjected to penetration damage;
s4, if the core sample test piece is subjected to osmotic damage, testing and recording the water head difference of the two end faces of the core sample test piece, stopping the test, and then calculating the osmotic damage gradient of the core sample test piece according to the osmotic damage gradient equal to the ratio of the water head difference of the two end faces of the core sample test piece to the height of the core sample test piece; and if the core sample test piece is not subjected to the osmotic damage, increasing the water pressure, continuing the test according to the operation of the step S3, repeating the operation until the core sample test piece is subjected to the osmotic damage, testing and recording the water head difference of the two end surfaces of the core sample test piece, stopping the test, and then calculating the osmotic damage ratio drop of the core sample test piece.
10. The method for detecting the infiltration destruction specific degradation quality of the core sample of the plastic concrete wall body according to claim 9, wherein the step S1 specifically comprises the following steps:
preprocessing a core sample test piece, comprising: placing the core sample test piece in a curing room, curing for 1-20 days, taking out, covering the surface of the core sample test piece with a wet towel after wringing, and standing until the surface is dry; then smearing cement paste on the side surface of the core sample test piece;
secondly, loading the core sample test piece processed in the first step into a core sample test piece placing area, and arranging a template on the surface of one side of the core sample test piece, which is far away from the connecting end of the penetration driving assembly on the test piece cabin; filling an impervious adhesive into the impervious adhesive filling area until the impervious adhesive is flush with the surface of one side of the core sample test piece far away from the connecting end of the infiltration driving assembly on the test piece cabin; covering the surfaces of the core sample test piece and the filled anti-permeability adhesive by using a template; arranging templates on two sides for 36-72 hours, and removing the templates; and then placing the mixture in a curing room for curing for 7-28 days.
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Application publication date: 20210402 |