Low-temperature crack resistance test device for detachable asphalt concrete panel

Abstract

The utility model discloses a low-temperature crack resistance test device for a detachable asphalt concrete panel, and relates to the field of concrete panel tests. Comprising a bottom plate, a detachable long plate, a detachable short plate, an induced joint steel plate, a constraint long rod and a constraint short rod, the two detachable long plates are installed on the two long edges of the bottom plate respectively. The two detachable short plates are installed on the two short edges of the bottom plate respectively. The inducing joint steel plate is connected to the middle position of the bottom plate; the restraining long rod penetrates through the inducing joint steel plate and two ends extend out of the detachable short plates; two ends of the constraint short rod extend out of the detachable long plate. According to the utility model, the mold structure of the single-sided freezing panel test is optimized, the mold removal and cleaning processes are simplified, the experiment operation is more efficient and convenient, the operability and repeatability of the test are obviously improved, and the labor and time cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of concrete panel test, especially a detachable asphalt concrete panel low temperature anti -cracking test device. BACKGROUND

[0002] Asphalt concrete plays a key role in the panel dam, and its excellent anti -permeability, deformation adaptability, durability and construction convenience make it become the important material of dam panel. It can effectively guarantee the safety, stability and economy of the dam, and has an irreplaceable position in modern water conservancy engineering. In order to reasonably evaluate the real working nature and cracking characteristic law of asphalt concrete panel under low temperature condition, it needs to carry out indoor test.

[0003] According to DL / T5362-2018 "hydraulic asphalt concrete test procedure" and the latest data, the existing asphalt concrete anti -cracking test mainly includes cylinder method (splitting test), prism method (small beam bending test, asphalt concrete freeze -off test), panel method (a kind of asphalt concrete panel single -sided anti -frost test device). The splitting test method (cylinder method) mainly evaluates the tensile, anti -cracking and low temperature characteristics of asphalt concrete, the small beam low temperature bending test mainly evaluates the low temperature bending performance of asphalt concrete, the asphalt concrete freeze -off test evaluates the low temperature cracking performance of asphalt concrete, and the low temperature cracking performance of the asphalt concrete panel under different angles Single -sided freezing, wherein:

[0004] 1. Splitting test piece preparation

[0005] Preparation of Marshall, splitting test piece, take out the mold from the oven, scrape the inner wall of the mold clean, and brush a layer of release agent on the inner wall of the mold, then take out the asphalt concrete from the stirring pot and pour it into the mold, then insert and tamping 15 times around the periphery, insert and tamping 10 times in the center, the whole process is not more than 1.5 min, then compact into a test piece with a height of 63.5±1.3mm.

[0006] 2. Small beam bending test piece preparation

[0007] Preparation of small beam bending test piece, preparation of plate or cylindrical test piece according to the regulation, and cutting into the specified size, the length, width and height of the test piece are 250mm*35mm*40mm, and the size deviation is ±2mm, ±1mm and ±1mm respectively.

[0008] 3. Preparation of asphalt concrete panel single -sided anti -frost test piece

[0009] Preparation of asphalt concrete panel single anti-freezing test piece, taking out the mold from the oven, scraping the inner wall of the mold, loading the asphalt concrete into the mold in turn and compacting, to make the test piece with the size of 300mm*200mm, and the height deviation not more than 0.5mm.

[0010] The above test and its test piece preparation are mostly test researches carried out for asphalt concrete core wall, and there are obvious shortcomings for the real working properties of asphalt concrete panel under low temperature conditions: 1. the mold removal process after the completion of the single freezing panel test is complex and difficult to clean; 2. the single freezing surface can only simulate the single freezing of the upper surface; 3. the stress state does not match the actual working condition, and the constraint of the leveling cement layer on the panel is not considered or only the constraint of the corners on the asphalt concrete panel is considered, and the constraint of the whole leveling cement layer on the asphalt concrete panel is not considered. Practical new type content

[0011] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0012] A detachable asphalt concrete panel low-temperature anti-cracking test device, comprising a bottom plate, detachable long plates, detachable short plates, induced joint steel plates, constraint long rods and constraint short rods; the detachable long plates are provided with two, which are respectively installed on the two long edges of the bottom plate; the detachable short plates are provided with two, which are respectively installed on the two short edges of the bottom plate; the induced joint steel plate is connected at the middle position of the bottom plate, the constraint long rod penetrates the induced joint steel plate and extends out of the detachable short plate at both ends; and the constraint short rod extends out of the detachable long plate at both ends.

[0013] Further, a plurality of installation grooves are horizontally arranged in the middle position of the bottom plate along the width direction, and the induced joint steel plates are inserted into the installation grooves.

[0014] Further, the top end of the induced joint steel plate is designed as a wedge surface structure.

[0015] Further, a plurality of first through holes for the constraint short rods to pass through are formed on the detachable long plate along the length direction, and the diameter of the first through hole is greater than the diameter of the constraint short rod.

[0016] Further, a plurality of second through holes for the constraint long rods to pass through are formed on the detachable short plate along the width direction, and the diameter of the second through hole is greater than the diameter of the constraint long rod.

[0017] Further, the detachable long plate and the detachable short plate are detachably connected with the bottom plate through the bolt connecting pieces.

[0018] The utility model has the advantages that:

[0019] The utility model discloses optimized single face frozen panel test's mould structure, has simplified the formwork and the cleaning process, make experimental operation more efficient convenient, improved the operability and repeatability of test significantly, reduced manpower and time cost, wide use, applicable to the different face single face freezing and many face freezing of asphalt concrete panel. The improved device considers the constraint effect of the leveling cementing layer material to the asphalt concrete panel, simulates the corner constraint, is closer to the stress state of actual engineering, improves the accuracy and engineering applicability of test result. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 It is the exploded view of the utility model;

[0021] Fig. 2 It is the plan view of the utility model;

[0022] Fig. 3 It is the side view of the utility model.

[0023] Among them, in the drawing:

[0024] 1 - detachable short board, 2 - detachable long board, 3 - induced joint steel plate, 4 - constraint long stick, 5 - bolt connecting piece, 6 - constraint short stick, 7 - bottom plate, 8 - first through hole, 9 - second through hole. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiments of the utility model will be apparently and completely described in conjunction with the drawings of the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range of protection of the utility model.

[0026] In conjunction with Figs. 1-3 The embodiment provides a detachable asphalt concrete panel low-temperature anti-cracking test device, which comprises a bottom plate 7, detachable long boards 2, detachable short boards 1, induced joint steel plates 3, constraint long sticks 4 and constraint short sticks 6; the detachable long boards 2 are provided with two, and are respectively installed on the two long edges of the bottom plate 7; the detachable short boards 1 are provided with two, and are respectively installed on the two short edges of the bottom plate 7; the induced joint steel plate 3 is connected at the middle position of the bottom plate 7, the constraint long stick 4 penetrates the induced joint steel plate 3 and extends out from the detachable short board 1 at both ends, and the constraint short stick 6 extends out from the detachable long board 2 at both ends.

[0027] Further optimize the technical scheme, and a plurality of installation grooves are horizontally arranged in the middle position of the bottom plate 7 along the width direction, and the induced joint steel plate 3 is inserted in the plurality of installation grooves.

[0028] Further optimize the technical scheme, the top of the induced slit steel plate 3 is designed as a wedge surface structure. The length, width and height of the induced slit steel plate 3 are 200mm, 8mm and 50mm respectively, wherein the height of the wedge surface part at the top of the induced slit is 40mm.

[0029] Further optimize the technical scheme, a plurality of first through holes 8 for the constraint short rod 6 to pass through are formed on the detachable long plate 2 along the length direction, and the diameter of the first through hole 8 is greater than the diameter of the constraint short rod 6, so that the installation of the constraint short rod 6 is facilitated. The diameter of the constraint long rod 4 is 5mm, and the length is greater than 300mm.

[0030] Further optimize the technical scheme, a plurality of second through holes 9 for the constraint long rod 4 to pass through are formed on the detachable short plate 1 along the width direction, and the diameter of the second through hole 9 is greater than the diameter of the constraint long rod 4, so that the installation of the constraint long rod 4 is facilitated. The diameter of the constraint short rod 6 is 5mm, and the length is greater than 200mm.

[0031] Further optimize the technical scheme, the detachable long plate 2 and the detachable short plate 1 are detachably connected with the bottom plate 7 through the bolt connecting piece 5.

[0032] In the preparation of the asphalt concrete panel anti-cracking test piece, the induced slit steel plate is spliced on the bottom plate, and small holes on the same horizontal line are drilled on each induced slit steel plate for inserting the constraint long rod. Then the detachable long and short plates are assembled through the bolt connecting piece, the first through hole is drilled in the detachable long plate for inserting the constraint short rod, and the second through hole is drilled in the detachable short plate for inserting the constraint long rod. The diameter of the first through hole is greater than that of the constraint short rod, and the diameter of the second through hole is greater than that of the constraint long rod. Thus the assembly mold is completed. After heating and cleaning the mold, the asphalt concrete is poured and compacted, and the preparation of the test piece is completed.

[0033] The mold structure of the single-face freezing panel test is optimized, the demolding and cleaning process is simplified, the experimental operation is more efficient and convenient, the operability and repeatability of the test are significantly improved, and the labor and time cost is reduced; the use range is wide, and the different face single-face freezing and multi-face freezing of the asphalt concrete panel are applicable. The improved device considers the constraint effect of the leveling cement layer material on the asphalt concrete panel, simulates the corner constraint, is closer to the stress state of the actual engineering, and improves the accuracy and engineering applicability of the test result.

[0034] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to the above described embodiments will be readily apparent to those of ordinary skill in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for testing the low temperature crack resistance of a detachable asphalt concrete panel, characterized by Include: The bottom plate, detachable long plate, detachable short plate, induced slit steel plate, restraint long rod and restraint short rod; The detachable long plate is provided with two, which are installed on the two long edges of the bottom plate; The detachable short plate is provided with two, which are installed on the two short edges of the bottom plate; The induced slit steel plate is connected at the middle position of the bottom plate, the restraint long rod penetrates the induced slit steel plate and the two ends extend out of the detachable short plate; The two ends of the restraint short rod extend out of the detachable long plate.

2. The low temperature cracking resistance test device for detachable asphalt concrete panel according to claim 1, characterized in that, A plurality of installation grooves are horizontally arranged in the middle position of the bottom plate along the width direction, and the induced slit steel plate is inserted into each installation groove.

3. The low temperature cracking resistance test device for detachable asphalt concrete panel according to claim 2, characterized in that, The top end of the induced slit steel plate is designed as a wedge surface structure.

4. The low-temperature cracking resistance test device for detachable asphalt concrete panels according to claim 1 or 3, characterized in that A plurality of first through holes for the restraint short rod to pass through are formed on the detachable long plate along the length direction, and the diameter of the first through hole is greater than the diameter of the restraint short rod.

5. The low temperature cracking resistance test device for detachable asphalt concrete panel according to claim 4, characterized in that, A plurality of second through holes for the restraint long rod to pass through are formed on the detachable short plate along the width direction, and the diameter of the second through hole is greater than the diameter of the restraint long rod.

6. The low-temperature cracking resistance test device for detachable asphalt concrete panels according to claim 1 or 5, characterized in that, The detachable long plate and the detachable short plate are detachably connected with the bottom plate through the bolt connecting piece.

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