CN108254536B - Corrugated pipe packaging plug, concrete self-shrinkage testing device using same and concrete self-shrinkage testing method - Google Patents
Corrugated pipe packaging plug, concrete self-shrinkage testing device using same and concrete self-shrinkage testing method Download PDFInfo
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 157
- 238000012360 testing method Methods 0.000 title claims abstract description 111
- 230000008859 change Effects 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000005538 encapsulation Methods 0.000 claims abstract description 23
- 239000004033 plastic Substances 0.000 claims description 26
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- 238000004891 communication Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims 3
- 239000000523 sample Substances 0.000 description 85
- 230000000694 effects Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 208000034189 Sclerosis Diseases 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
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- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
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Abstract
The invention discloses a corrugated pipe packaging plug, and a concrete self-contraction testing device and method using the corrugated pipe packaging plug. The testing device comprises a corrugated pipe die and a packaging plug; the corrugated pipe mold comprises a packaging end, corrugations and a corrugation pitch; the encapsulation end cap comprises a round disc, a hollow shell, an embedded part, a connecting cylinder, a rubber plug, a long rod plug and a vent nozzle. The invention solves the test error caused by the relative movement of the plug and the corrugated pipe die in the self-contraction test of the concrete under the condition of high temperature or variable temperature; the problem that the plug is separated from the concrete sample is solved; the problem of exhaust when the corrugated pipe mold is sealed by the plug is solved; the influence of the pressure change in the corrugated pipe die on the test result is solved; the problem of the friction of bellows mould and test support bring the error for the test is solved. The invention provides a scientific and reliable technical scheme and a technical method for the self-contraction test of the concrete, and has good operability.
Description
Technical Field
The invention relates to the technical field of concrete testing, in particular to a corrugated pipe packaging plug, and a concrete self-contraction testing device and method using the corrugated pipe packaging plug.
Background
Along with the construction and development of various large civil engineering at home and abroad, the research on the performance of concrete is gradually deepened in the industry, the self-shrinkage test of the concrete is taken as an important test means of the performance of the concrete, the self-shrinkage index of the concrete can provide a basis for the evaluation of the crack resistance of a concrete structure, and the self-shrinkage index of the concrete is also an important basis for calculating a stress field and a crack risk in the crack risk evaluation of the concrete structure.
At present, the concrete self-contraction test methods are various, but internationally, the bellows method is widely recognized as a more reasonable test method, one of the inventors of the invention, Navy, in 2009 and JENSEN Ole Mejlhide of Danish university of science and technology, published on silicate bulletin "the method for testing early self-contraction of cement-based materials by using bellows", discussed the reliability and theoretical basis of the bellows method test, in the same year, the test method is adopted by US standard ASTM C1698, Navy, and the like also reported a patent "CN610200038892. X early self-deformation test method and device of concrete", the patent technology realizes the test of concrete condensation and self-drying contraction after the initial setting of concrete; the inventor of the present invention has made a further improvement on the testing device of the bellows method, and obtained a patent "CN 201420842970.1 bellows packaging end and a cement-based material self-contraction measuring device using the same", but still has some problems, such as the use environment temperature of the testing method is 20 ℃, and the problems of inconvenient exhaust, the separation of the plug from the concrete, the relative displacement between the plug and the mold, the binding force of the mold on the concrete sample caused by the change of the air pressure in the mold, etc. The self-shrinkage index of concrete at 20 ℃ cannot meet the requirements of the existing research and engineering, and in order to obtain more accurate simulation results and evaluation conclusions in the crack risk evaluation of a concrete structure, a variable temperature environment needs to be established as a test environment according to the change process of a temperature field of actual structural concrete, and the self-shrinkage of the concrete is tested under the variable temperature condition. In this case, the plastic plug is not suitable for use because of large deformation caused by temperature influence, the deformation rate of the concrete sample is larger than that in a normal temperature environment, friction between the corrugated pipe mold and the test support before and after final setting of the concrete cannot be ignored, and the pressure change caused by the temperature influence and the concrete sample deformation influence inside the corrugated pipe mold is also large, and such factors can bring large influence on the test result.
Therefore, a technical scheme and a technical method which can solve a series of problems need to be designed, and the corrugated pipe mould and the packaging plug for testing the self-shrinkage of the concrete and the using method thereof provided by the invention provide a good solution.
Disclosure of Invention
When the corrugated pipe method is adopted to test the self-shrinkage of concrete, the following problems exist: the packaging plug is not tightly combined with the corrugated pipe mold; the phenomenon that the packaging plug is separated from the concrete sample can occur in the expansion or contraction process of the concrete; the former plastic plug (ASTM C1698) is greatly influenced by the deformation of temperature change and is not suitable for a high-temperature or variable-temperature testing environment; when the packaging plug is matched with the corrugated pipe mold, the gas in the packaging plug is difficult to discharge; when the early self-shrinkage of a concrete sample is tested, the length change of the corrugated pipe die or the change of the environmental temperature causes the change of the internal air pressure of the corrugated pipe die, and the change of the air pressure causes the corrugated pipe die to generate a constraint force on the deformation of the concrete sample, so that the early self-shrinkage test of the concrete sample is inaccurate; when the early self-shrinkage of a concrete sample is tested, the friction force between the conventional corrugated pipe die and the test support can cause errors with different generation degrees of concrete test data. In order to solve the problems, the invention provides a corrugated pipe packaging plug, a concrete self-contraction testing device using the corrugated pipe packaging plug and a method, which are realized in the following way:
a corrugated pipe packaging plug comprises a round disc, a hollow shell, an embedded part, a connecting cylinder, a long rod plug or a vent nozzle, a rubber plug, an air bag and a plastic pipe;
the round plate is of a round cake structure, and is provided with vent holes and plate surface holes, wherein the vent holes are positioned at the 12 o 'clock position of the round plate, and the plate surface holes are positioned at the 6 o' clock position of the round plate;
the embedded part comprises an embedded part disc and a screw rod;
the hollow shell is of a 2-4-degree cup body structure and comprises a cup opening, a cup wall and a cup bottom, and the hollow shell is firmly matched with the round panel to form a hollow structure inside; the diameter of the cup opening is larger than that of the cup bottom, an embedded part groove is formed in the outer side of the cup bottom of the hollow shell, and the embedded part groove and the embedded part disc form thread fit capable of being freely disassembled and assembled; a circular knife is arranged on the wall of the hollow shell, a hollow shell hole is formed in the bottom of the hollow shell, the knife edge of the circular knife faces the round disc, and the hollow shell hole is located at the 12 o' clock position of the bottom surface of the cup body;
the diameter of the hollow shell hole is 1-2 mm smaller than that of the vent hole, the hollow shell hole and the vent hole are located on the same axis and are communicated through the connecting cylinder, the diameter of the connecting cylinder is consistent with that of the vent hole, the communicating structure formed by the vent hole, the connecting cylinder and the hollow shell hole is a communicating hole, the communicating hole is not communicated with the hollow structure, the disc surface hole is communicated with the hollow structure, the rubber plug can plug the hollow shell hole through the outer side of the bottom of the hollow shell, and the long rod plug can be inserted into the communicating hole through the vent hole to plug the hollow shell hole;
the vent nozzle comprises a rubber nozzle and a rubber pipe, and the rubber nozzle and the hollow shell hole form a fit capable of being freely disassembled and assembled;
the air bag is connected with the vent hole through a plastic pipe, and the volume of the air bag in a free state is 50-100 cm3；
The stock stopper includes stock and T type rubber buffer, and T type rubber buffer front end can run through the vacant shell hole and form closely cooperating with the vacant shell hole, T type rubber buffer includes barrel type groove and chock plug, and when the stock stopper passed from air vent and connecting cylinder and plugged up the vacant shell hole, chock plug and vacant shell hole cooperation, the length of chock plug is not less than the length in vacant shell hole, and barrel type groove is stifled in the juncture of vacant shell hole and connecting cylinder, realizes better sealed effect.
The diameter of the vent hole is 5-8 mm, and the diameter of the disk surface hole is 1-2 mm;
the rubber buffer is from the bottom of cup outside shutoff dead shell hole of dead shell, is a short rubber buffer, and its length is 4 ~ 8mm, T type rubber buffer is inserted from the air vent, passes the connecting cylinder and blocks up the dead shell hole again, and the chock plug length of T type rubber buffer is not less than the length in dead shell hole.
A concrete self-contraction testing device using the corrugated pipe packaging plugs comprises the corrugated pipe packaging plugs and a corrugated pipe mold, wherein the number of the corrugated pipe packaging plugs is two; the corrugated pipe mold comprises a packaging end, corrugations and a corrugation pitch; the encapsulation end is located the both ends of bellows mould, is bellows mould and encapsulation end cap complex part, and 2 ~ 4 tapering are established to the internal diameter of encapsulation end, and the internal diameter in the outside of encapsulation end is greater than the internal diameter of inboard, ripple width b is 5 ~ 10mm, and the ripple is apart from being the coupling part between two ripples, and the width an of ripple distance is 1 ~ 2 mm.
In order to ensure that the corrugated pipe mould does not generate restraint on the early deformation of concrete, the corrugated pipe mould is made of a material with the density of 0.90-0.92 g/cm3The force for stretching the corrugated pipe mould by 3mm and compressing the corrugated pipe mould by 3mm in a free state is not more than 20 mN.
When the packaging plug is matched with the corrugated pipe mold, the knife edge of the circular knife is abutted against the inner wall of the packaging end, so that the packaging plug cannot be withdrawn from the packaging end of the corrugated pipe mold, and therefore the packaging plug and the packaging end form a matching which can be installed but cannot be detached.
When the concrete self-contraction test is carried out in a high-temperature environment or a variable-temperature environment, the air inside the hollow structure of the packaging plug can generate air pressure change, the disc surface hole has the function of ensuring that the air in the hollow structure flows in or out, and the air pressure of the hollow structure is equal to the air pressure of the external environment, so that the air pressure change of the hollow structure can not cause the volume change of the packaging plug, and errors are brought to the test.
The packaging plugs are used for packaging the packaging ends at two ends of the corrugated pipe die, the packaging plugs at one end are fixed, and displacement change of the circular disc of the packaging plugs at the other end is tested. The encapsulation end cap at one end is fixed in a magnetic connection mode, so that the encapsulation end cap is made of a metal material with magnetic conductivity.
The screw rod arranged in the packaging plug can be tightly combined with a concrete sample in the corrugated pipe die, so that the packaging plug and the concrete sample form a whole, and the concrete sample is prevented from being separated from the packaging plug during deformation testing, particularly during temperature change testing.
A method of using the concrete self-contraction testing device of the corrugated pipe packaging plug when only the self-contraction of hardened concrete is tested, comprising the following steps:
(1) blocking a hollow shell hole of one packaging plug by using a rubber plug, matching the packaging plug with a packaging end of a corrugated pipe mold, and tightly pressing;
(2) vertically standing the open end of the corrugated pipe mold upwards, pouring a newly mixed concrete sample into the corrugated pipe mold, stopping pouring when the concrete is poured to the position of the packaging end at the upper part, taking a packaging plug to be tightly matched with the packaging end of the corrugated pipe mold, discharging gas in the corrugated pipe mold through a communicating hole, and then penetrating a long rod plug through a vent hole and a connecting cylinder to seal an empty shell hole;
(3) after the newly-mixed concrete sample hardens, concrete sample, bellows mould and encapsulation end cap form one kind and can directly be used for the sclerosis sample of shrink test, the screw rod of burying the piece buries underground in the concrete sample, buries the piece and forms firm non-detachable cooperation with the concrete sample, during the test, will the one end of sclerosis sample is fixed, tests the displacement change of the other one end, after the test, digs the encapsulation end of bellows mould, unscrews the disc and the vacant shell of encapsulation end cap, buries the piece still to combine together with the concrete sample, takes new buried piece again with the buried piece groove of vacant shell forms screw-thread fit, remains to wait for next test and uses.
The use method of the concrete self-contraction testing device for the corrugated pipe packaging plug comprises the following steps when testing the self-contraction of a concrete sample from plasticity to hardening stage:
(1) taking one packaging plug, plugging a hollow shell hole of the packaging plug by using a rubber plug, taking the other packaging plug, installing a vent nozzle in the hollow shell hole of the packaging plug, and installing an air bag in a vent hole of the packaging plug; matching the packaging plug plugged by the rubber plug with one end of the corrugated pipe mold, and tightly pressing;
(2) vertically standing a corrugated pipe mould with an opening end facing upwards, pouring a newly mixed concrete sample into the corrugated pipe mould, when the concrete sample is poured to a position 10-15 mm away from a packaging end at the upper part, matching a packaging plug provided with a vent nozzle and an air bag with the packaging end at the upper part of the corrugated pipe mould, abutting a rubber pipe of the vent nozzle against a first section or a second section of corrugated part closest to the packaging end at the upper part, tightly pressing the packaging plug, slightly flattening the corrugated pipe mould containing the concrete sample, ensuring that an air hole is positioned at a 12-o' clock direction position, slightly vibrating to enable the concrete sample to level in the corrugated pipe mould, simultaneously discharging gas in the corrugated pipe mould to the upper part of the corrugated pipe mould, communicating each corrugation of the corrugated pipe mould through air at the upper part, communicating the corrugation of the corrugated pipe mould with the air bag through a communication hole, and communicating the packaging plug with the air bag through the communication hole, The corrugated pipe die, the air bag and the concrete sample form a plastic sample which can be directly used for the early self-contraction test of the concrete;
(3) when the early self-shrinkage of a concrete sample is tested, the plastic sample is lifted, one end of the plastic sample is fixed, and the displacement change of the other end of the plastic sample is tested; in the testing process, the air bag generates volume change along with the length change and the temperature change of the corrugated pipe die, so that the air pressure in the corrugated pipe die is always equal to the external air pressure;
(4) after the test is finished, the packaging end of the corrugated pipe die is planed, the round disc of the packaging plug and the hollow shell are unscrewed, the embedded part is still combined with the concrete sample, and then a new embedded part is taken to form threaded fit with the embedded part groove of the hollow shell for the next test.
During the test, with the fixed mode of concrete sample one end for magnetic connection, the magnetic force sucking disc cooperates with the disc of encapsulation end cap, realizes effective, convenient operation mode.
The plastic sample is hoisted by a hoisting chain, the hoisting chain is hung on a test bracket, the corrugation pitch is the hoisting acting point, and the hardened sample can also be tested by adopting a hoisting method.
In addition to the above-described method, other test elements, such as a temperature tube sensor, a capillary negative pressure probe, and the like, may be embedded in the concrete sample through the communication hole to test the performance parameters of the concrete sample.
The invention has the beneficial effects that:
(1) the packaging plug is provided with the circular knife, so that the packaging plug and a corrugated pipe mold can be tightly combined;
(2) the encapsulation plug is provided with the embedded part, and a screw of the embedded part can be tightly combined with a concrete sample, so that the concrete sample can not be separated from the encapsulation plug in the expansion or contraction process;
(3) the invention adopts the hollow metal to seal the plug, and can be suitable for testing the concrete sample in a high-temperature or variable-temperature environment;
(4) the packaging plug is provided with the communicating hole, so that gas in the corrugated pipe die can be conveniently discharged;
(5) the communicating hole of the packaging plug can be connected with the air bag, so that the interior of the corrugated pipe die is communicated with the air bag, the air pressure in the corrugated pipe die can be ensured to be always equal to the external atmospheric pressure, and the influence of test results such as air pressure change in the corrugated pipe die is avoided;
(6) the corrugated pipe die is provided with a corrugated distance of 1-2 mm as an acting point when the corrugated pipe die is hoisted, namely the forming die is the corrugated pipe die capable of being hoisted, and when the corrugated pipe die is hoisted, the friction force between the corrugated pipe die and the test support can be completely eliminated.
Drawings
FIG. 1 is a schematic view of concrete encapsulated by a corrugated pipe mold and an encapsulation plug
FIG. 2 is a schematic view of the bellows mold and the packaging plug packaging concrete with the air bag
FIG. 3 is a schematic view of the use of the bellows mold being lifted
FIG. 4 is a schematic view showing an assembly structure of the disc, the hollow shell, the embedded member and the connecting cylinder
FIG. 5 is a schematic view of a structure of an embedded part
FIG. 6 is a schematic view of a bellows structure
FIG. 7 is a schematic view of a stem plug
FIG. 8 is a schematic view of a hollow shell structure
FIG. 9 is a schematic view of a T-shaped rubber stopper
FIG. 10 is a schematic view of a vent nozzle
FIG. 11 is a schematic view of a hardened sample with a removed encapsulation plug
FIG. 12 is a schematic structural view of a plastic sample after hardening and with the encapsulation plug removed
FIG. 13 is a left side view of the assembled structure of the disc, the hollow shell, the insert and the connecting cylinder
Each of fig. 1 to 13 is labeled as: 1 packaging plug, 11 round disc, 111 vent hole, 112 disc face hole, 12 empty shell, 121 cup wall, 1211 round knife, 122 cup bottom, 1221 embedded piece groove, 1222 empty shell hole, 123 cup mouth, 13 embedded piece, 131 embedded piece disc, 132 screw rod, 14 connecting cylinder, 15 rubber plug, 16 long rod plug, 161 long rod, 162T type rubber plug, 1621 barrel type groove, 1622 plug head, 17 vent nozzle, 171 rubber nozzle, 172 rubber tube, 18 hollow structure, 2 corrugated tube die, 21 packaging end, 22 corrugation, 23 corrugation pitch, 3 concrete sample, 4 air bag, 41 plastic tube, 5 testing support, 51 sling chain, 52 magnetic force suction cup.
Detailed Description
The corrugated pipe mold 2 for testing the self-contraction of the concrete comprises a packaging end 21, corrugations 22 and a corrugation distance 23, wherein the packaging end 21 is located at two ends of the corrugated pipe mold 2 and is a part of the corrugated pipe mold 2 matched with the packaging plug 1, 4-degree taper is arranged in the packaging end 21, the width b of each corrugation 22 is 8mm, the corrugation distance 23 is a connecting part between the two corrugations 22, and the width a of each corrugation distance 23 is 1 mm.
In order to ensure that the corrugated pipe die 2 does not generate restraint on the early deformation of the concrete sample 3, the material of the corrugated pipe die 2 is low-density polyethylene, and the force for stretching 3mm and compressing 3mm of the corrugated pipe die 2 in a free state is not more than 20 mN.
The packaging plug 1 for testing the self-contraction of concrete comprises a round disc 11, a hollow shell 12, an embedded part 13, a connecting cylinder 14, a rubber plug 15, a long rod plug 16 and a vent nozzle 17, wherein the round disc 11 is of a round cake structure, the hollow shell 12 is of a 4-degree cup body structure and comprises a cup opening 123, a cup wall 121 and a cup bottom 122, the hollow shell 12 is firmly matched with the round disc 11 and forms a hollow structure 18 inside, a embedded part groove 1221 is arranged on the outer side of the bottom surface of the cup body of the hollow shell 12, the embedded part 13 and the embedded part groove 1221 form a thread fit capable of being freely disassembled and assembled, a vent hole 111 and a disc surface hole 112 are arranged on the round disc 11, the vent hole 112 is positioned at the 1112 o ' clock position of the round disc, the disc surface hole 112 is positioned at the 116 o ' clock position of the round disc, a round knife 1211 and a hollow hole 1222 are also arranged on the hollow shell 12, the knife edge of the round knife 1211 faces the round disc surface, the hollow hole 1222 is positioned at the 12 o ' clock position, the hollow hole 1222 and the vent hole 111 are located on the same axis and are communicated through the connecting cylinder 14, the communicating structure of the vent hole 111, the connecting cylinder 14 and the hollow hole 1222 is a communicating hole, the communicating hole is not communicated with the hollow structure 18, the disk surface hole 112 is communicated with the hollow structure 18, the rubber plug 15 can block the hollow hole 1222 through the outer side of the hollow shell 12, and the long rod plug 16 can be inserted through the vent hole 111 and block the hollow hole 1222.
The edge of the circular knife 1211 abuts against the inner wall of the sealing end 21, so that the sealing plug 1 cannot be withdrawn from the sealing end 21 of the corrugated pipe mold 2, and therefore, the sealing plug 1 and the sealing end 21 form an assembly-but-non-disassembly fit; the two encapsulation plugs 1 encapsulate the encapsulation ends 21 at the two ends of the bellows mold 2.
The diameter of the vent hole 111 is 6mm, and the diameter of the disk surface hole 112 is 2 mm.
The long rod plug 16 comprises a long rod 161 and a T-shaped rubber plug 162, the front end of the T-shaped rubber plug 162 can just penetrate through the empty shell hole 1222 and form a tight fit with the empty shell hole 1222, the T-shaped rubber plug 162 comprises a barrel-shaped groove 1621 and a plug head 1622, when the long rod plug 16 penetrates through the empty shell hole 1222 from the vent hole 112 and the connecting cylinder 14, the plug head 1622 is matched with the empty shell hole 1222, and the barrel-shaped groove 1621 is blocked at the junction of the empty shell hole 1222 and the connecting cylinder 14, so that a better sealing effect is achieved.
The packaging plug 1 is made of a metal material with magnetic conductivity.
The air vent nozzle 17 includes a rubber nozzle 171 and a rubber tube 172, and the rubber nozzle 171 is detachably engaged with the hollow hole 1222.
The embedded part 13 comprises an embedded part disc 131 and a screw 132, the embedded part disc 131 and the embedded part groove 1221 form a threaded fit, and the screw 132 can be tightly combined with the concrete sample 3, so that the packaging plug 1 and the concrete sample 3 form a whole, and the concrete sample 3 is prevented from being separated from the packaging plug 1 during a deformation test, especially during a temperature change test.
The use method of the corrugated pipe mold 2 and the packaging plug 1 for testing the self-shrinkage of concrete is characterized by comprising the following two use methods:
the first use method comprises the following steps: when only the self-shrinkage of the hardened concrete is tested, the hollow case hole 1222 of one packaging plug 1 is blocked by using the rubber plug 15, so that the packaging plug 1 is matched with the packaging end 21 of the corrugated pipe mold 2 and is tightly pressed; the open end of a corrugated pipe mould 2 is vertically erected upwards, a newly mixed concrete sample 3 is poured into the corrugated pipe mould 2, when the concrete is poured to the position of an upper packaging end 21, the pouring is stopped, a packaging plug 1 is taken to be tightly matched with the packaging end 21 of the corrugated pipe mould 2, the gas in the corrugated pipe mould 2 is discharged through a communication hole, a long rod plug 16 penetrates through a vent hole 111 and a connecting cylinder 14 to seal a vacant shell hole 1222, after the newly mixed concrete sample 3 is hardened, the concrete sample 3, the corrugated pipe mould 2 and the packaging plug 1 form a hardened sample which can be directly used for self-shrinkage testing, a screw 132 of an embedded part 13 is embedded in the concrete sample 3, the embedded part 13 is firmly and non-detachably matched with the concrete sample 3, one end of the hardened sample is fixed during testing, and the displacement change of the other end is tested, after the test is finished, the packaging end 21 of the corrugated pipe mold 2 is planed, the round disc 11 and the hollow shell 12 of the packaging plug 1 are unscrewed, the embedded part 13 is still combined with the concrete sample 3 (figure 11), and then a new embedded part 13 is taken to form threaded fit with the embedded part groove 1221 of the hollow shell 12 for the next test;
the second use method comprises the following steps: when the test concrete sample 3 shrinks from plasticity to hardening stage, one packaging plug 1 is taken, the hollow hole 1222 of the packaging plug is blocked by the rubber plug 15, the other packaging plug 1 is taken, the vent nozzle 17 is arranged in the hollow hole 1222 of the packaging plug, and the air bag 4 is arranged in the vent hole 112 of the packaging plug; matching the packaging plug 1 blocked by the rubber plug 15 with one end of the corrugated pipe mold 2, and pressing tightly; vertically standing a corrugated pipe mold 2 with an open end facing upwards, pouring a newly mixed concrete sample 3 into the corrugated pipe mold 2, when the concrete sample 3 is poured to a position 2110mm away from an upper packaging end, matching a packaging plug 1 provided with a vent nozzle 17 and an air bag 4 with a packaging end 21 on the upper part of the corrugated pipe mold 2, abutting a rubber pipe 172 of the vent nozzle 17 against a first section of corrugations 22 nearest to the upper packaging end 21, tightly pressing the packaging plug 1, slightly flattening the corrugated pipe mold 2 containing the concrete sample 3, ensuring that an air hole 111 is positioned at a 12 o' clock direction position, slightly vibrating to enable the concrete sample 3 to flow in the corrugated pipe mold 2, simultaneously discharging air in the corrugated pipe mold 2 to the upper part of the corrugated pipe mold 2, enabling each corrugation 22 of the corrugated pipe mold 2 to be communicated through air on the upper part, and enabling the corrugation 22 of the corrugated pipe mold 2 to be communicated with the air bag 4 through the communication hole, the packaging plug 1, the corrugated pipe die 2, the air bag 4 and the concrete sample 3 form a plastic sample which can be directly used for the early self-contraction test of concrete; when the early self-shrinkage of the test concrete sample 3 is carried out, the plastic sample is lifted, one end of the plastic sample is fixed, and the displacement change of the other end is tested; in the testing process, the air bag 4 generates volume change along with the length change and the temperature change of the corrugated pipe die 2, so that the air pressure in the corrugated pipe die 2 is always equal to the external air pressure; after the test is finished, the packaging end 21 of the corrugated pipe mold 2 is planed, the circular disc 11 and the hollow shell 12 of the packaging plug 1 are unscrewed, the embedded part 13 is still combined with the concrete sample 3 (fig. 12), and then a new embedded part 13 is taken to form threaded fit with the embedded part groove 1221 of the hollow shell 12 for the next test.
During testing, the mode of fixing one end of the hardening sample is magnetic connection, and the magnetic suction disc 52 is matched with the round disc 11 of the packaging plug 1, so that an effective and convenient operation mode is realized.
The plastic sample is hoisted by a hoist chain 51, the hoist chain 51 is hung on the test bracket 5, the corrugation pitch 23 is the hoisting point, and the hardened sample can also be tested by adopting a hoisting method.
The air bag 4 is connected with the vent hole 111 through a plastic pipe 41, and the volume of the air bag 4 in a free state is 80cm3。
In addition to the above method of use, other test elements may be embedded in the concrete sample 3 through the communication holes to test the performance parameters of the concrete sample 3.
Example 1
The self-contraction of the C60 concrete from the beginning of final setting to the age of 28 days is tested, the inner diameter of a corrugated pipe die is 58mm, the outer diameter of the corrugated pipe die is 80mm, the width of the corrugation of the corrugated pipe is 8mm, the width of the corrugation pitch is 1mm, the force for stretching the corrugated pipe die for 3mm and compressing the corrugated pipe die for 3mm in a free state is respectively 16mN and 18mN, the test environment is changed into temperature, and the temperature change process is increased from 20 ℃ to 65 ℃ after 25 hours and is decreased to 20 ℃ after 100 hours. Taking a packaging plug, plugging a hollow shell hole by using a rubber plug to enable the hollow shell hole to be matched with one end of a corrugated pipe mold and tightly pressing the hollow shell hole, enabling the packaging plug not to withdraw from the corrugated pipe mold at the moment, vertically standing the open end of the corrugated pipe mold upwards, pouring a newly-mixed C60 concrete sample into the corrugated pipe mold, stopping pouring when the concrete is poured to the position of the upper packaging end, taking a packaging plug to be tightly matched with the packaging end of the corrugated pipe mold, discharging gas in the corrugated pipe mold through a communication hole, sealing the communication hole of the packaging plug by using a long rod plug, and directly using the corrugated pipe mold packaged with the concrete sample, namely a hardened sample for self-shrinkage testing after the newly-mixed concrete sample is finally set. The test result shows that the phenomenon that the packaging plug is separated from the concrete sample does not occur under the action of the embedded part, and the problem that the packaging plug and the packaging end of the corrugated pipe die move relatively does not occur under the action of the circular knife, so that a good test effect is realized.
After the test is finished, the packaging end of the corrugated pipe die is planed, the round disc and the empty shell of the packaging plug are unscrewed, the embedded part is still combined with the concrete sample, and a new embedded part is taken and screwed on the embedded part groove and is reserved for the next test.
Example 2
The early self-shrinkage of the C50 concrete was tested, the inner diameter of the bellows mold was 58mm, the outer diameter was 80mm, the width of the bellows was 8mm, the width of the corrugation pitch was 1mm, the force used to stretch the bellows mold by 3mm and compress it by 3mm was 16mN, and the test environment temperature was 35 ℃. Taking one packaging plug, plugging the empty shell hole by using a rubber plug, taking the other packaging plug, installing a vent nozzle in the empty shell hole, and installing an air bag in the vent hole; matching the packaging plug plugged by the rubber plug with one end of the corrugated pipe mold, and tightly pressing; vertically standing a corrugated pipe mold with an open end facing upwards, pouring a newly mixed concrete sample into the corrugated pipe mold, when the concrete sample is poured to a position 10mm away from a packaging end at the upper part, matching a packaging plug provided with a vent nozzle and an air bag with the packaging end at the upper part of the corrugated pipe mold, abutting a rubber pipe of the vent nozzle against a first section of corrugation closest to the packaging end at the upper part, tightly pressing the packaging plug, slightly flattening the corrugated pipe mold containing the concrete sample, ensuring that an air hole is positioned at a 12 o' clock direction position, slightly vibrating to enable the concrete sample to be leveled in the corrugated pipe mold, simultaneously extruding gas in the corrugated pipe mold to the upper part of the corrugated pipe mold, and enabling each corrugation of the corrugated pipe mold to be communicated through air at the upper part to form a plastic sample; using a test support capable of hanging a hanging chain to hang a plastic sample, sucking the packaging plug by a magnetic sucker at one end to ensure that the magnetic sucker is firmly fixed, and testing the displacement change of the packaging plug at the other end; in the testing process, the air bag generates volume change along with the length change and the temperature change of the corrugated pipe die, so that the air pressure in the corrugated pipe die is always equal to the external air pressure; the test result shows that the early self-contraction of the concrete sample does not generate the test error caused by the change of the internal pressure of the corrugated pipe mould, the corrugated pipe mould is lifted, and the friction force between the corrugated pipe mould and the test support is not generated, so that the good test effect is realized.
After the test is finished, the packaging end of the corrugated pipe die is planed, the round disc and the empty shell of the packaging plug are unscrewed, the embedded part is still combined with the concrete sample, and a new embedded part is taken and screwed on the embedded part groove and is reserved for the next test.
Claims (7)
1. The utility model provides a bellows encapsulation end cap which characterized in that: comprises a round disc (11), a hollow shell (12), an embedded part (13), a connecting cylinder (14), a long rod plug (16) or a vent nozzle (17), a rubber plug (15), an air bag (4) and a plastic tube (41);
the round plate (11) is of a round cake structure, vent holes (111) and plate surface holes (112) are formed in the round plate (11), the vent holes (111) are located at 12 o 'clock positions of the round plate (11), and the plate surface holes (112) are located at 6 o' clock positions of the round plate (11);
the embedded part (13) comprises an embedded part disc (131) and a screw rod (132);
the hollow shell (12) is of a 2-4-degree cup body structure and comprises a cup opening (123), a cup wall (121) and a cup bottom (122); the hollow shell (12) is firmly matched with the round panel (11) to form a hollow structure (18) inside; the diameter of the cup mouth (123) is larger than that of the cup bottom (122), an embedded part groove (1221) is formed in the outer side of the cup bottom (122) of the hollow shell (12), and the embedded part groove (1221) and the embedded part disc (131) form thread fit capable of being freely disassembled and assembled; a circular knife (1211) is arranged on the cup wall (121) of the hollow shell (12), a hollow shell hole (1222) is formed in the cup bottom (122) of the hollow shell (12), the knife edge of the circular knife (1211) faces the circular disc (11), and the hollow shell hole (1222) is located at the 12 o' clock position of the bottom surface of the cup body;
the diameter of the hollow shell hole (1222) is 1-2 mm smaller than that of the vent hole (111), the hollow shell hole (1222) and the vent hole (111) are located on the same axis and are communicated through a connecting cylinder (14), the diameter of the connecting cylinder (14) is consistent with that of the vent hole (111), and the communicating structure formed by the vent hole (111), the connecting cylinder (14) and the hollow shell hole (1222) is a communicating hole; the communication hole is not communicated with the hollow structure (18), the disc surface hole (112) is communicated with the hollow structure (18), the rubber plug (15) can block the hollow shell hole (1222) through the outer side of the cup bottom (122) of the hollow shell, and the long rod plug (16) can be inserted into the communication hole through the vent hole (111) to block the hollow shell hole (1222);
the air vent nozzle (17) comprises a rubber nozzle (171) and a rubber pipe (172), and the rubber nozzle (171) and the hollow shell hole (1222) are matched in a detachable mode;
the air bag (4) is connected with the vent hole (111) through a plastic pipe (41), and the volume of the air bag (4) in a free state is 50-100 cm3；
The long rod plug (16) comprises a long rod (161) and a T-shaped rubber plug (162), and the front end of the T-shaped rubber plug (162) can penetrate through the hollow shell hole (1222) and form tight fit with the hollow shell hole (1222); t type rubber buffer (162) are including bucket type groove (1621) and chock plug (1622), and when long pole stopper (16) passed from air vent (111) and connecting cylinder (14) and stopped up empty shell hole (1222), chock plug (1622) and empty shell hole (1222) cooperation, the length of chock plug (1622) is not less than the length of empty shell hole (1222), and bucket type groove (1621) blocks up the juncture in empty shell hole (1222) and connecting cylinder (14).
2. The bellows packaging plug according to claim 1, wherein the diameter of the vent hole (111) is 5-8 mm, and the diameter of the disc hole (112) is 1-2 mm; the length of the rubber plug (15) is 4-8 mm.
3. A concrete self-contraction testing device provided with the corrugated pipe packaging plug of claim 2, wherein: the concrete self-contraction testing device also comprises a corrugated pipe die (2); the number of the corrugated pipe packaging plugs (1) is two; the corrugated pipe mould (2) comprises a packaging end (21), corrugations (22) and a corrugated distance (23); the packaging ends (21) are positioned at two ends of the corrugated pipe mold (2) and are parts of the corrugated pipe mold (2) matched with the packaging plug (1), the inner diameter of each packaging end (21) is provided with a taper of 2-4 degrees, the inner diameter of the outer side of each packaging end (21) is larger than that of the inner side of the packaging end, the width b of each corrugation (22) is 5-10 mm, the corrugation distance (23) is a connecting part between the two corrugations, and the width a of each corrugation distance (23) is 1-2 mm;
the force for stretching 3mm and compressing 3mm of the corrugated pipe die (2) in a free state is not more than 20 mN;
when the packaging plug (1) is matched with the corrugated pipe mould (2), the edge of the circular knife (1211) abuts against the inner wall of the packaging end (21); the packaging plug (1) and the packaging end (21) form a matching which can be installed but cannot be detached.
4. The concrete self-contraction testing device according to claim 3, wherein the encapsulation plugs (1) are used for encapsulating the encapsulation ends (21) at two ends of the corrugated pipe mold (2), the encapsulation plug (1) at one end is fixed with the circular disc (11) through a magnetic sucking disc (52) in a matching mode, and the displacement change of the circular disc (11) of the encapsulation plug at the other end is tested;
the packaging plug (1) is made of a metal material with magnetic conductivity.
5. The method of using the concrete self-contraction test device according to claim 4, wherein the test device is used for testing the self-contraction of the hardened concrete, and comprises the following steps:
(1) blocking a hollow shell hole (1222) of a packaging plug (1) by using a rubber plug (15), so that the packaging plug (1) is matched with a packaging end (21) of a corrugated pipe mold (2) and is tightly pressed;
(2) vertically standing the open end of a corrugated pipe mold (2) upwards, pouring a newly mixed concrete sample (3) into the corrugated pipe mold (2), stopping pouring when the concrete is poured to the position of a packaging end (21) at the upper part, taking a packaging plug (1) to be tightly matched with the packaging end (21) of the corrugated pipe mold (2), discharging gas in the corrugated pipe mold through a communicating hole, then penetrating a long rod plug (16) through a vent hole (111) and a connecting cylinder (14), and sealing an empty shell hole (1222);
(3) after the newly-mixed concrete sample is hardened, the concrete sample (3), the corrugated pipe die (2) and the packaging plug (1) form a hardened sample which can be directly used for a self-contraction test, a screw rod (132) of the embedded part (13) is embedded in the concrete sample (3), the embedded part (13) and the concrete sample (3) form firm and non-detachable fit, one end of the hardened sample is fixed during testing, the displacement change of the other end of the testing is carried out, the packaging end (21) of the corrugated pipe die (2) is planed after the testing is finished, the round panel (11) and the hollow shell (12) of the packaging plug (1) are unscrewed, the embedded part (13) is still combined with the concrete sample, and then the new embedded part (13) and the embedded part groove (1221) of the hollow shell (12) are taken to form thread fit for the next testing.
6. The method for using the concrete self-contraction testing device of claim 4, wherein the testing device is used for testing the self-contraction of the concrete sample from the plastic stage to the hardening stage, and comprises the following steps:
(1) one packaging plug (1) is taken, the hollow shell hole (1222) is blocked by a rubber plug (15), the other packaging plug (1) is taken, a vent nozzle (17) is installed in the hollow shell hole (1222), and an air bag (4) is installed in the vent hole (111); matching the packaging plug (1) blocked by the rubber plug (15) with one end of the corrugated pipe mould (2) and pressing tightly;
(2) vertically standing the open end of a corrugated pipe mold (2) upwards, pouring a newly mixed concrete sample (3) into the corrugated pipe mold (2), matching a packaging plug (1) provided with a vent nozzle (17) and an air bag (4) with a packaging end (21) at the upper part of the corrugated pipe mold (2) when the concrete sample (3) is poured to a position 10-15 mm away from the packaging end (21) at the upper part, abutting a rubber pipe (172) of the vent nozzle (17) against a first section or a second section of corrugated plug (22) nearest to the packaging end (21) at the upper part, tightly pressing the packaging plug (1), slightly flattening the corrugated pipe mold (2) containing the concrete sample, ensuring that an air vent (112) is positioned at a 12 o' clock direction position, slightly vibrating to enable the concrete sample to flow in the corrugated pipe mold, and simultaneously discharging and extruding the air in the corrugated pipe mold to the upper part of the corrugated pipe mold, each ripple of the corrugated pipe die is communicated through air at the upper part, the ripple of the corrugated pipe die is also communicated with the air bag (4) through a communication hole, and the packaging plug (1), the corrugated pipe die (2), the air bag (4) and the concrete sample (3) form a plastic sample which can be directly used for the early self-contraction test of concrete;
(3) when the early self-shrinkage of a concrete sample is tested, the plastic sample is lifted, one end of the plastic sample is fixed, and the displacement change of the other end of the plastic sample is tested; in the testing process, the air bag (4) generates volume change along with the length change and the temperature change of the corrugated pipe die (2), so that the air pressure in the corrugated pipe die is always equal to the external air pressure;
(4) after the test is finished, the packaging end (21) of the corrugated pipe die (2) is planed, the round disc (11) and the hollow shell (12) of the packaging plug (1) are unscrewed, the embedded part (13) is still combined with the concrete sample (3), and then a new embedded part (13) and the embedded part groove (1221) of the hollow shell (12) are taken to form thread fit for the next test.
7. The method of using a concrete self-contraction test device according to claim 6, wherein the plastic specimen is suspended by a suspension chain (51) in the step (3), the suspension chain (51) is suspended on the test support (5), and the corrugation pitch (23) is a point of impact of the suspension.
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| CN112743669B (en) * | 2020-12-21 | 2022-03-08 | 中国建筑科学研究院有限公司 | Fluidity concrete test piece forming test frame and test method |
| CN112698014A (en) * | 2020-12-21 | 2021-04-23 | 三明莆炎高速公路有限责任公司 | Concrete self-contraction testing device |
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