CN211402299U - Shrinkage deformation testing arrangement of inorganic binder stable material - Google Patents
Shrinkage deformation testing arrangement of inorganic binder stable material Download PDFInfo
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- CN211402299U CN211402299U CN201921940685.2U CN201921940685U CN211402299U CN 211402299 U CN211402299 U CN 211402299U CN 201921940685 U CN201921940685 U CN 201921940685U CN 211402299 U CN211402299 U CN 211402299U
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Abstract
The utility model discloses a shrinkage deformation testing arrangement of inorganic binder stabilized material provides a novel device. The test piece is a standard test piece in T0844-2009 in JTG _ E51-2009, and two ends of the test piece are respectively provided with a mounting groove; the test piece can be freely and telescopically arranged on the base; the testing component comprises a testing nail positioning frame and embedded testing nails, a preformed hole for fixing the embedded testing nails is formed in the center of the top surface of the testing nail positioning frame, the n-shaped testing nail positioning frame is inserted into and fixed in the mounting groove, and cross nicks and central concave points are formed in the top surface of the embedded testing nail cap; the pointed insertion foot of the handheld strain gauge is matched with the central concave point. The utility model overcomes original test method operation is complicated, can not remove in the testing process, the test result easily receives external factor influence etc. not enough, has characteristics such as simple, reliable, accurate.
Description
Technical Field
The utility model discloses a testing arrangement of inorganic binder stabilized material shrinkage deformation belongs to indoor geotechnical test technical field.
Background
In the curing process, the inorganic binder stabilizing material generates certain shrinkage deformation along with the change of environment such as temperature, humidity and the like. When the shrinkage deformation is restrained, cracks may be generated in the road base. After the base layer cracks, water can enter the roadbed along the cracks, and the road structure can be quickly damaged under the action of the vehicle cyclic load, so that the service life of the road is shortened. The shrinkage deformation such as dry shrinkage, temperature shrinkage and the like of the inorganic binder can be accurately measured, so that the shrinkage deformation characteristic of the inorganic binder can be researched by researchers, and the cracking phenomenon of the inorganic binder in engineering application can be avoided.
At present, the test method of shrinkage deformation of the inorganic binder stable material is mainly a test method for dry shrinkage and temperature shrinkage given by highway engineering inorganic binder stable material test regulation (JTG _ E51-2009). Although the method can be used for testing the shrinkage deformation of the test piece, the test process is easily influenced by factors such as ambient wind and vibration, and the test result has high discreteness. In addition, the test method is difficult to carry in the test process, and the test operation is difficult. Chinese patent ZL201621062514.0 discloses a device for testing the shrinkage deformation of an inorganic binder stabilizing material, but the device still cannot eliminate the influence of interference factors in the test process on the test result. Therefore, it is necessary to design a simple and reliable test device and test method for testing the shrinkage deformation of the inorganic binder stable material.
Disclosure of Invention
The utility model aims at providing an inorganic binder stabilizing material's shrinkage deformation testing arrangement for accurate, reliable survey inorganic binder stabilizing material shrinkage deformation under various environment.
The utility model discloses the scheme does: a shrinkage deformation testing device for inorganic binder stable materials comprises a base, a testing part, a test piece and a handheld strain gauge, wherein the base is horizontally arranged,
the test piece is a standard test piece in T0844-2009 in JTG _ E51-2009, and two ends of the test piece are respectively provided with a mounting groove; the test piece can be freely and telescopically arranged on the base;
the testing component comprises a testing nail positioning frame and embedded testing nails, a preformed hole for fixing the embedded testing nails is formed in the center of the top surface of the testing nail positioning frame, the n-shaped testing nail positioning frame is inserted into and fixed in the mounting groove, and cross nicks and central concave points are formed in the top surface of the embedded testing nail cap;
the pointed insertion foot of the handheld strain gauge is matched with the central concave point.
The center distance between the two mounting grooves is 250 mm.
The width of mounting groove is 2cm, and the degree of depth is 4 mm.
The handheld strain gauge is a commercially available YB-25 type.
The embedded measuring nail is made of invar steel materials.
And a plurality of rolling bodies are uniformly arranged between the test piece and the base.
The rolling bodies are glass rods.
The preformed hole is a step hole with a large upper part and a small lower part.
That is to say, the testing device comprises a base, a testing part, an improved test piece and a handheld strain gauge.
The test part comprises: and the measuring nail positioning frame is embedded with the measuring nail. The center of the top surface of the nail measuring positioning frame is provided with a preformed hole which is big-end-up and step-shaped. The side face of the embedded testing nail positioning frame is a rectangular plug and can be inserted into a groove in a test piece. The embedded measuring nail is made of invar rigid material, a cross nick is processed on the top surface of the cap, a small concave point is arranged at the center of the cross nick, the diameter of the concave point is slightly larger than that of a pointed pin insertion foot of the handheld strain gauge, and the depth is 3 mm.
The improved test piece is characterized in that two symmetrical rectangular grooves are respectively formed in the inner surfaces of a test piece T0844-2009 in JTG _ E51-2009 in the long side direction, the width of each groove is 2cm, the depth of each groove is 4mm, the height of each groove is equal to the height of the test piece, and the center distance between the two grooves is 250mm (a crossbeam and a middle beam).
The hand-held strain gauge is of the type YB-25 commercially available.
A method of testing the shrinkage deformation of an inorganic binder stabilized material, the method comprising the steps of:
(1) before the test piece is molded, the rectangular plug of the test pin positioning frame is inserted from top to bottom along the rectangular groove of the test piece. (2) The mixed inorganic binder is loaded into the prepared test piece in three layers, and after each layer is added, the mixture is lightly inserted and compacted from the periphery to the center by a tamper. And after the weighed materials are completely added, inserting the measuring nail into a preformed hole of the measuring nail positioning frame. The nail cap is guaranteed to be just clamped in the preformed hole, and the top surface of the nail cap is lower than the top surface of the nail measuring positioning frame. Finally, compacting and forming the inorganic binder stable material according to the method in T0844-2009 in the test specification of highway engineering inorganic binder stable materials (JTG _ E51-2009).
(3) And after the mold is removed, placing the test piece with the test pin positioning frame and the embedded test pins into a curing chamber, and taking out the test piece after curing to a specified age. After the initial mass of the test piece is weighed, the test piece is placed on a base with the glass rods arranged, and finally the test piece is placed in a required test environment.
(4) And (3) testing the initial distance of the concave points on the top surfaces between the two testing nails by using a handheld strain gauge, wherein the testing method is executed according to the specification of the handheld strain gauge. The test was repeated three times per reading and the average was taken, with the frequency of testing initially being once per day and every 10 days after one month.
(5) And after the test is finished, weighing the final mass of the test piece, and taking out the testing pin positioning frame and the testing pin for the next test. Calculate the strain due to shrinkage:
the test method and the device can measure shrinkage deformation such as dry shrinkage, temperature shrinkage and the like of various inorganic binder stable materials. The method overcomes the defects that the original test method is complex in operation, cannot move in the test process, is easy to be influenced by external factors and the like, and has the characteristics of simplicity, reliability, accuracy and the like.
Drawings
Fig. 1 is an overall view of the present invention.
Fig. 2 is a schematic view of a pin-measuring positioning frame.
FIG. 3 is a cross-sectional view of the pin locator.
Fig. 4 shows a schematic view of the pin.
Fig. 5 is a schematic view of the nail head of the measuring nail.
In the figure: 1-test base, 2-glass rod, 3-test piece, 4-test pin positioning frame, 5-pre-embedded test pin, 6-reserved slot hole, 7-cross nick and concave point.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
A method of testing the shrinkage deformation of an inorganic binder stabilized material, the method comprising the steps of.
(1) Before the test piece is molded, the rectangular plug of the test pin positioning frame 4 is inserted from top to bottom along the rectangular groove of the test piece.
(2) The mixed inorganic binder is loaded into the prepared test piece in three layers, and after each layer is added, the mixture is lightly inserted and compacted from the periphery to the center by a tamper. After the weighed materials are completely added, the measuring nail 5 is inserted into the preformed hole 6 of the measuring nail positioning 4, the nail cap is guaranteed to be just clamped in the preformed hole, and the top surface of the nail cap is lower than the top surface of the measuring nail positioning frame. Finally, compacting and forming the inorganic binder stable material according to the method in T0844-2009 in the test specification of highway engineering inorganic binder stable materials (JTG _ E51-2009).
(3) And after the mold is removed, placing the test piece with the test pin positioning frame and the embedded test pins into a curing chamber, and taking out the test piece after curing to a specified age. After weighing the initial mass of the test piece 3, putting the test piece 3 on the base 1 with the glass rod 2 arranged, and finally placing the test piece in a required test environment.
(4) And (3) testing the initial distance of the concave points on the top surfaces of the two embedded testing nails 5 by using a handheld strain gauge, wherein the testing method is executed according to the specification of the handheld strain gauge. The test was repeated three times per reading and the average was taken, with the frequency of testing initially being once per day and every 10 days after one month.
(5) And after the test is finished, weighing the final mass of the test piece, and taking out the testing nail positioning frame 4 and the embedded testing nails 5 for the next test.
Referring to fig. 1, the device for testing the shrinkage deformation of the inorganic binder stable material comprises a handheld strain gauge, an improved test piece, a test base 1, a glass rod 2, a test piece 3, a test pin positioning frame 4 and embedded test pins 5.
The improved test piece is characterized in that two symmetrical rectangular grooves are respectively formed in the inner surfaces of a T0844-2009 test piece in JTG _ E51-2009 in the long side direction, the width of each groove is 2cm, the depth of each groove is 4mm, the height of each groove is equal to the height of the test piece, and the center distance between the two grooves is 250mm (a girder and a middle beam).
The measuring nail positioning frame 4 is made of cast iron materials, a slot hole 6 is reserved on the top surface, the upper portion and the lower portion of the reserved slot hole 6 are step-shaped, and the measuring nail positioning frame plays a role in mounting a measuring nail.
(3) The width and the thickness of the rectangular plug of the nail positioning frame 4 are further measured to be the same as those of the reserved groove of the test piece.
(4) Referring to fig. 3 and 4, the processing material of the embedded measuring nail 5 is invar, the top surface of the nail cap is provided with a cross nick, the center of the cross nick is provided with a concave point 7, the depth of the concave point 7 is 3mm, and the diameter of the concave point 7 is slightly larger than that of the pointed insertion foot of the handheld strain gauge.
Claims (9)
1. A shrinkage deformation testing device for inorganic binder stable materials comprises a base, a testing part, a test piece and a handheld strain gauge, wherein the base is horizontally arranged,
the test piece is a standard test piece in T0844-2009 in JTG _ E51-2009, and two ends of the test piece are respectively provided with a mounting groove; the test piece can be freely and telescopically arranged on the base;
the testing component comprises an embedded testing nail positioning frame and embedded testing nails, a preformed hole for fixing the embedded testing nails is formed in the center of the top surface of the embedded testing nail positioning frame, the n-shaped embedded testing nail positioning frame is inserted into and fixed in the mounting groove, and the top surface of an embedded testing nail cap is provided with cross nicks and a central concave point;
the pointed insertion foot of the handheld strain gauge is matched with the central concave point.
2. The apparatus for testing shrinkage deformation of an inorganic binder stabilizing material as claimed in claim 1, wherein the distance between centers of the two mounting grooves is 250 mm.
3. The apparatus for testing shrinkage deformation of an inorganic binder stabilizing material as claimed in claim 2, wherein the mounting groove has a width of 2cm and a depth of 4 mm.
4. The apparatus of claim 1, wherein the hand-held strain gauge is of the type YB-25 commercially available.
5. The device for testing the shrinkage deformation of the inorganic binder stable material according to claim 1, wherein the embedded test nails are processed from invar steel.
6. The apparatus for testing shrinkage deformation of an inorganic binder stabilizing material as claimed in claim 1, wherein a plurality of rolling elements are uniformly disposed between the test piece and the base.
7. The apparatus of claim 6, wherein the rolling member is a glass rod.
8. The apparatus for testing shrinkage deformation of an inorganic binder stabilizing material as claimed in claim 1, wherein the prepared hole is a stepped hole with a large top and a small bottom.
9. The apparatus for testing shrinkage deformation of an inorganic binder stabilizing material as claimed in claim 1, wherein the diameter of the central concave point is slightly larger than the diameter of the pointed insertion foot of the hand-held strain gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921940685.2U CN211402299U (en) | 2019-11-12 | 2019-11-12 | Shrinkage deformation testing arrangement of inorganic binder stable material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921940685.2U CN211402299U (en) | 2019-11-12 | 2019-11-12 | Shrinkage deformation testing arrangement of inorganic binder stable material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211402299U true CN211402299U (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921940685.2U Expired - Fee Related CN211402299U (en) | 2019-11-12 | 2019-11-12 | Shrinkage deformation testing arrangement of inorganic binder stable material |
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| Country | Link |
|---|---|
| CN (1) | CN211402299U (en) |
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2019
- 2019-11-12 CN CN201921940685.2U patent/CN211402299U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200901 Termination date: 20211112 |
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| CF01 | Termination of patent right due to non-payment of annual fee |