CN-122016429-A - Device and method for tamping enhanced asphalt mixture Marshall tamping test

CN122016429ACN 122016429 ACN122016429 ACN 122016429ACN-122016429-A

Abstract

The invention relates to the technical field of engineering test equipment, in particular to a tamping device and a tamping method for a Marshall tamping test of an enhanced asphalt mixture. The tamping device comprises a tamping barrel, a tamping piece and a driving assembly, wherein a tamping cavity for filling asphalt mixture is formed in the tamping barrel, a scraping and lubricating plate is arranged in the tamping cavity, holes are formed in the scraping and lubricating plate, the holes comprise scraping holes and lubricating holes, the tamping piece comprises a pressing plate and a plurality of tamping bars, the tamping bars are arranged on the bottom side of the pressing plate and penetrate through the holes of the scraping and lubricating plate, and the driving assembly is arranged outside the tamping barrel and used for driving the tamping piece to reciprocate along the axial direction of the tamping cavity so as to tamp the asphalt mixture. The tamping device ensures that the mixture is uniformly distributed in the test die before tamping, ensures the stability of the volume index and the mechanical property of the formed test piece, and improves the reliability of test data.

Inventors

AN HUA
FENG HUAXIN
HAN GUOLIANG
ZHANG QIAN
WANG DAN
Shi Andu
MA LEI
LIU SHUO
YANG HUADONG
PAN XIAOPENG

Assignees

山东汇达新型建筑材料有限公司

Dates

Publication Date: 20260512
Application Date: 20260212

Claims (10)

1. The device for tamping the Marshall tamping test of the enhanced asphalt mixture is characterized by comprising a tamping barrel, a tamping piece and a driving assembly; The tamping barrel is internally provided with a tamping cavity for filling asphalt mixture, the tamping cavity is internally provided with a scraping and lubricating plate, the scraping and lubricating plate is provided with holes, and the holes comprise scraping holes and lubricating holes; The tamping tool comprises a pressing plate and a plurality of tamping bars, wherein the tamping bars are arranged at the bottom side of the pressing plate and are connected in the holes of the scraping and lubricating plate in a penetrating way; the driving assembly is arranged outside the tamping barrel and used for driving the tamping member to reciprocate along the axial direction of the tamping cavity so as to tamp the asphalt mixture.
2. The reinforced asphalt mixture marshall compaction test ramming apparatus of claim 1, wherein the ramming barrel is of a cylindrical structure, the pressing plate is a circular plate, and the pressing plate can move along the wall of the ramming chamber.
3. The reinforced asphalt mixture marshall compaction test ramming apparatus of claim 1, wherein the scraping holes are located at the lower side for scraping asphalt mixture adhered on the ramming rod, and the lubrication holes are located at the upper side for applying lubricant to the outer wall of the ramming rod.
4. The reinforced asphalt mixture Marshall compaction test ramming apparatus according to claim 3, wherein the scraping hole is a cylindrical hole, the lubrication hole is a conical hole, the diameter of the upper end of the conical hole is larger than the diameter of the lower end of the conical hole, and the diameter of the lower end of the conical hole is equal to the diameter of the cylindrical hole.
5. The reinforced asphalt mixture Marshall compaction test ramming device according to claim 4, wherein the scraping and lubricating plate is internally provided with an oil cavity, the outer wall of the scraping and lubricating plate is provided with an oil inlet hole communicated with the oil cavity, and the wall of the lubricating hole is provided with an oil filler hole communicated with the oil cavity.
6. The device for testing and tamping an enhanced asphalt mixture Marshall according to claim 5, wherein a plurality of oil filling holes are arranged in a circumferential array along the axis of the vibrating rod.
7. The reinforced asphalt mixture marshall compaction test ramming apparatus of claim 1, wherein the ramming member further comprises a connecting rod, the lower end of the connecting rod is connected with the pressing plate, and the upper end of the connecting rod is connected with the driving assembly.
8. The apparatus of claim 7, wherein the driving assembly comprises a bracket and a pressing rod, the bracket is fixed on the outer wall of the tamping barrel, the pressing rod is rotatably mounted on the bracket, one end of the pressing rod is rotatably connected with the connecting rod, and the lower end of the connecting rod is rotatably connected with the pressing plate.
9. The reinforced asphalt mixture marshall compaction test ramming apparatus of claim 8, wherein the support is further provided with an angle sensor, and the rotation axis of the angle sensor is coaxially connected with the rotation axis of the compression bar, so as to detect the rotation direction of the compression bar relative to the support.
10. A tamping method of an enhanced asphalt mixture marshall tamping test tamping device according to any one of claims 1 to 9, comprising: The driving assembly drives the tamping member to reciprocate in the tamping cavity along the axial direction, so that a plurality of tamping rods penetrate through holes on the scraping and lubricating plate to tamp the asphalt mixture; During the upward movement of the ramming rod, asphalt mixture adhered to the outer surface of the ramming rod is scraped by a scraping material Kong Guachu positioned at the lower side in a scraping material lubrication plate; The rotation direction of the pressing rod relative to the support is detected through the angle sensor, and when the pressing rod is detected to rotate along the set direction, lubricating oil is controlled to be coated on the outer surface of the tamping rod through the lubricating hole.

Description

Device and method for tamping enhanced asphalt mixture Marshall tamping test Technical Field The invention relates to the technical field of engineering test equipment, in particular to a tamping device and a tamping method for a Marshall tamping test of an enhanced asphalt mixture. Background In the field of highway engineering test equipment, the Marshall compaction test of asphalt mixtures is a key link for preparing standard test pieces to evaluate the volume index and the mechanical properties of the standard test pieces. The test is typically carried out by loading the heated asphalt mixture into a standard Marshall test mold and impact molding with a compaction hammer. Before compaction, the mixture in the test mould needs to be manually inserted and smashed, so that coarse aggregate segregation is eliminated, internal uniformity is improved, a good initial state is provided for subsequent compaction, and the method is an important premise for obtaining reliable test data. At present, before marshall compaction in the industry, an operator uses a hand-held tool such as a slotting tool or a large screwdriver to conduct layered slotting and tamping on a hot asphalt mixture placed in a marshall test die, and as the manual work is completely relied on, the randomness of the slotting and tamping point position, depth and strength is large, especially for the edge area of the test die, the tool is difficult to keep vertical and uniform cutting, so that the tamping effect obtained by the mixture in the area is inconsistent with that in the central area, density gradient is easily formed inside a test piece, and the uniformity and representativeness of volume indexes such as the void ratio of the final test piece are directly influenced. Secondly, for the high-viscosity special mixture such as the RPC rubber-plastic composite enhancement type, the resistance in the manual tamping process is large, so that the operation time is prolonged. The exposure time of the hot mixture in the air is increased, the temperature loss is accelerated, the viscosity of the mixture is extremely sensitive to the temperature, the tamping difficulty is further increased and the working performance is changed due to the temperature reduction, so that the condition of a formed test piece deviates from the standard requirement, and the reliability of a test result is reduced. In addition, the mixture is very easy to adhere to the surface of a metal tamping tool, so that the resistance of each tamping is increased, the operation handfeel and the force control are affected, and in addition, during continuous operation, the adhesion can be continuously accumulated, and in the prior art, before the tamping tool is used for tamping, a workpiece is required to be dipped with lubricating oil, so that the working efficiency is reduced. Disclosure of Invention Aiming at the defects existing in the prior art, the embodiment of the invention aims to provide a device and a method for the Marshall compaction test of an enhanced asphalt mixture, which ensure that the mixture is uniformly distributed in a test die before compaction, ensure the stability of the volume index and the mechanical property of a formed test piece and improve the reliability of test data. In order to achieve the above object, the embodiment of the present invention provides the following technical solutions: The reinforced asphalt mixture Marshall compaction test ramming device comprises a ramming barrel, ramming pieces and a driving assembly, wherein a ramming cavity for filling asphalt mixture is formed in the ramming barrel, a scraping and lubricating plate is arranged in the ramming cavity, holes are formed in the scraping and lubricating plate, the holes comprise scraping holes and lubricating holes, the ramming pieces comprise a pressing plate and ramming bars, the ramming bars are provided with a plurality of ramming bars, the ramming bars are all installed on the bottom side of the pressing plate and penetrate through the holes of the scraping and lubricating plate, and the driving assembly is installed outside the ramming barrel and used for driving the ramming pieces to reciprocate along the axial direction of the ramming cavity so as to tamp the asphalt mixture. Optionally, the tamping barrel is a cylindrical structure, the pressing plate is a circular plate, and the pressing plate can move along the cavity wall of the tamping cavity. Optionally, the scraping hole is located at the lower side and used for scraping asphalt mixture adhered on the tamping rod, and the lubricating hole is located at the upper side and used for coating lubricating oil on the outer wall of the tamping rod. Optionally, the scraping hole is a cylindrical hole, the lubricating hole is a conical hole, the diameter of the upper end of the conical hole is larger than that of the lower end of the conical hole, and the diameter of the lower end of the conical hole is equal to that of the cyl