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CN-115753491-B - Fiber density measuring method for asphalt mixture

CN115753491BCN 115753491 BCN115753491 BCN 115753491BCN-115753491-B

Abstract

The application discloses a fiber density measuring method for asphalt mixture, which belongs to the technical field of fiber density measurement for asphalt mixture, and comprises a specific gravity bottle, a vacuum container and a vacuumizing device, wherein the vacuumizing device comprises a base, a vibrating table and a vacuumizing pump which are arranged on the base, the vacuum container comprises a mounting cylinder and a top cover, a bearing frame is arranged in the mounting cylinder, the bearing frame comprises a bearing plate for bearing the specific gravity bottle and a clamping frame for clamping the specific gravity bottle, a connecting block is fixed on the bottom surface of the bearing plate, a connecting groove for inserting the connecting block is formed in the bottom surface of the mounting cylinder, positioning grooves are formed in the opposite inner sides of the connecting groove, the mounting cylinder is radially slipped along the self through the positioning grooves, and fixing grooves for inserting the positioning blocks are formed in the two sides of the connecting block. The application can rapidly discharge the bubbles in the gravity bottle.

Inventors

  • YUAN SONG
  • YIN YILIN
  • YANG GUOQIANG
  • WANG SHUN
  • WANG XIAOJIA

Assignees

  • 上海市市政公路工程检测有限公司

Dates

Publication Date
20260512
Application Date
20221027

Claims (8)

  1. 1. The method for measuring the fiber density of the asphalt mixture is characterized by comprising the following steps: s1, weighing a specific gravity bottle to obtain a mass I ; S2, weighing the gravity bottle filled with water to obtain a second mass ; S3, weighing a specific gravity bottle filled with a fiber sample to be measured to obtain a third mass ; S4, filling the specific gravity bottle filled with the fiber sample to be tested with water, placing the specific gravity bottle in a vacuum container (14), placing water into the vacuum container (14), vacuumizing the vacuum container (14) by using a vacuumizing device (1), and taking out the specific gravity bottle and weighing after vacuumizing is finished to obtain the mass IV ; S5, calculating the density and the relative density of the fiber sample to be measured according to the following formula: ; ; Wherein, the The relative density of the fiber sample to be measured is dimensionless; The density of the fiber sample to be measured; The mass of the dried specific gravity bottle; Is the total mass of the gravity bottle and the full water; The total mass of the specific gravity bottle and the fiber sample to be measured is measured; The total mass of the gravity bottle, the filled fiber sample to be tested and the filled water; Is the density of water at a preset temperature; The vacuum pumping device (1) comprises a base (11), a vibrating table (12) and an air pump (17) which are arranged on the base (11), wherein the vacuum container (14) comprises a mounting cylinder (15) and a top cover (16), a bearing frame (3) is arranged in the mounting cylinder (15), the bearing frame (3) comprises a bearing plate (31) for bearing a specific gravity bottle and a clamping frame (5) for clamping the specific gravity bottle, a connecting block (8) is fixed on the bottom surface of the bearing plate (31), a connecting groove (81) for inserting the connecting block (8) is formed in the bottom surface of the mounting cylinder (15), positioning grooves (83) are formed in the inner sides of the connecting groove (81), positioning blocks (82) are arranged in the mounting cylinder (15) in a sliding mode along the radial direction of the positioning grooves (83), and fixing grooves (84) for inserting the positioning blocks (82) are formed in the two sides of the connecting block (8). The top surface of the bearing plate (31) is provided with a plurality of placing grooves (32) for placing the specific gravity bottles, the clamping frame (5) comprises clamping plates (51) arranged above the bearing plate (31), the top surface of each clamping plate (51) is provided with a movable through groove (52) for penetrating through the specific gravity bottles, the inner wall of each movable through groove (52) is provided with a clamping ring groove (53), the clamping ring grooves (53) are internally provided with a plurality of rotating blocks (56) and a plurality of clamping rods (54), the clamping rods (54) are arranged at intervals along the circumference of each movable through groove (52), the top surfaces of the clamping rods (54) are provided with displacement grooves (55), the rotating blocks (56) move along the length direction of each clamping rod (54) through the corresponding displacement grooves (55), the end parts of the clamping rods (54) can be abutted against the tops of the specific gravity bottles, and the clamping plates (51) are internally provided with driving pieces for driving the clamping rods (54) to rotate into the movable through grooves (52); The driving piece comprises a first gear (57) rotatably arranged in the clamping ring groove (53), the first gear (57) is fixedly connected with one end, away from the moving through groove (52), of the clamping rod (54), a connecting ring groove (58) communicated with the clamping ring groove (53) is formed in the outer peripheral surface of the clamping plate (51), and a first internal gear (59) meshed with the first gear (57) is rotatably arranged in the connecting ring groove (58).
  2. 2. The method for measuring the fiber density of the asphalt mixture according to claim 1, wherein a reset through groove (85) is formed in the side face of the positioning block (82), a reset block (86) penetrating through the reset through groove (85) is fixed on the inner wall of the positioning block (83), a first spring (87) is fixed on the side face of the reset block (86) away from the connecting groove (81), one end of the first spring (87) away from the reset block (86) is fixedly connected with the inner wall of the reset through groove (85), an abutting groove (91) communicated with the positioning groove (83) is formed in the bottom face of the mounting cylinder (15), an abutting block (9) is installed on the bottom face of the abutting block (9) in a sliding mode along the vertical direction through the abutting groove (91), a second spring (92) is fixed on the bottom face of the abutting block (9), an abutting groove (93) is formed in the side face of the abutting block (9) and used for penetrating through one end of the reset block (86), and an abutting groove (93) is formed in the side face of the abutting block (9), and an abutting groove (93) is formed in the side face of the abutting block (82).
  3. 3. The method for measuring the fiber density for the asphalt mixture according to claim 2, wherein a dovetail groove (37) is formed in the inner wall of the mounting cylinder (15), the mounting cylinder (15) is provided with a first dovetail block (34) and a second dovetail block (96) through the dovetail groove (37) in a vertically sliding manner, the bottom surface of the first dovetail block (34) can be abutted against the top surface of the second dovetail block (96), the second dovetail block (96) is fixedly connected with the side surface of the abutting block (9), a fixing rod (4) is fixedly arranged at the top of the dovetail groove (37), a spring (41) is arranged at the outer part Zhou Rao of the fixing rod (4), one end of the spring (41) is fixedly connected with the outer peripheral surface of the fixing rod (4), the other end of the spring (41) is fixedly connected with the top surface of the first dovetail block (34), a limit groove (42) is formed in the inner wall of the mounting cylinder (15), the mounting cylinder (15) is fixedly connected with the bottom surface of the dovetail groove (43) through the limit groove (42) in a vertically sliding manner, the limit groove (43) is fixedly connected with the bottom surface (43), one end of the stay cord (46) far away from the floating block (43) penetrates through the connecting through groove and is fixedly connected with the bottom surface of the first dovetail block (34).
  4. 4. The method for measuring the fiber density for the asphalt mixture according to claim 3, wherein guide blocks (44) are fixed on two sides of the floating block (43), guide grooves (45) are formed in the inner walls of the limiting grooves (42), and the guide blocks (44) are vertically connected with the mounting cylinder (15) in a sliding mode through the guide grooves (45).
  5. 5. The method for measuring the fiber density for the asphalt mixture according to claim 3, wherein the two sides of the bearing plate (31) are respectively fixed with a bearing rod (33), the side surface of the first dovetail block (34) close to the bearing rod (33) is fixed with a bearing block (35), the side surface of the bearing block (35) close to the bearing rod (33) is provided with a yielding groove (36), and the bearing rod (33) is in sliding connection with the bearing block (35) along the vertical direction through the yielding groove (36).
  6. 6. The method for measuring the fiber density for the asphalt mixture according to claim 1, wherein the clamping groove (61) is formed in the top surface of the first internal gear (59), the fixing through groove (63) is formed in the top surface of the clamping plate (51), the clamping plate (51) is provided with a clamping block (6) which can be inserted into the clamping groove (61) through the fixing through groove (63) in a vertical sliding manner, the side surface of the clamping block (6) is provided with a sliding groove (62), a sliding block (64) penetrating through the sliding groove (62) is fixed on the inner wall of the fixing through groove (63), a spring III (65) is fixed on the bottom surface of the sliding block (64), and the bottom end of the spring III (65) is fixedly connected with the bottom surface of the sliding groove (62).
  7. 7. The method for measuring the fiber density for the asphalt mixture according to claim 1, wherein four adjusting screws (7) are fixed on the bottom surface of the clamping plate (51), an adjusting through hole (71) is formed in the top surface of the bearing plate (31), a gear II (72) is rotatably installed in the adjusting through hole (71), an adjusting through groove (73) for penetrating the adjusting screws (7) is formed in the top surface of the gear II (72), threads are formed in the inner circumferential surface of the adjusting through groove (73), the adjusting screws (7) are in threaded transmission fit with the gear II (72), an accommodating groove (74) is formed in the outer circumferential surface of the bearing plate (31), and a second inner gear (75) meshed with the gear II (72) is rotatably installed in the accommodating groove (74).
  8. 8. The method for measuring the fiber density for the asphalt mixture according to claim 7, wherein a ratchet wheel (76) is fixedly sleeved on the outer peripheral surface of the second internal gear (75), a pawl (77) is rotatably arranged on the bottom surface of the accommodating groove (74), the pawl (77) can be inserted into a tooth groove of the ratchet wheel (76), an accommodating block (78) is fixedly arranged on the bottom surface of the accommodating groove (74), a spring IV (79) is fixedly arranged on the side surface, close to the pawl (77), of the accommodating block (78), and one end, far away from the accommodating block (78), of the spring IV (79) is fixedly connected with the side surface, far away from the ratchet wheel (76), of the pawl (77).

Description

Fiber density measuring method for asphalt mixture Technical Field The application relates to the technical field of fiber density measurement for asphalt mixtures, in particular to a fiber density measurement method for asphalt mixtures. Background The asphalt mixture is a mixture formed by mixing asphalt binder and mineral aggregate (aggregate and filler), and in order to improve the performance of the asphalt mixture, a modified material is added into the asphalt binder or the asphalt mixture, and fibers (wood fibers, polymer fibers and mineral fibers) can improve the performance of the asphalt mixture. . The blending of the fibers generally makes the asphalt mixture more viscous and difficult to disperse. The result of the relative density test of each component material in the asphalt mixture is a precondition for calculating the theoretical maximum relative density of the mixture. When an operator determines the relative density of fibers for asphalt mixtures, the operator needs to determine the quality of the fibers after the fibers are mutually dissolved with water, and in order to ensure the accuracy of the measurement result, air bubbles on the surfaces of the fibers need to be removed, and a vacuuming treatment method is generally adopted for a sample to remove the air bubbles. The specific gravity bottle filled with water and fiber to be detected is placed in a vacuum container filled with water, and the vacuum container is vacuumized, so that the water in the vacuum container enters the specific gravity bottle through a bottle stopper on the specific gravity bottle, and bubbles in the specific gravity bottle are removed. In view of the above-mentioned related art, the inventors believe that when the bubbles in the gravity bottle are removed by means of evacuation, in order to prevent the lubricant in the pump from deteriorating due to the water in the vacuum vessel being sucked into the pump, the amount of water in the vacuum vessel should be lower than the top of the vacuum vessel, and since the bottle stopper on the gravity bottle is not always immersed in water when the gravity bottle is placed in the vacuum vessel, the bubble discharge efficiency is low. Disclosure of Invention In order to solve the problem of low air bubble discharge efficiency in a specific gravity bottle in the measurement process, the application provides a fiber density measurement method for asphalt mixture. The application provides a fiber density measuring method for asphalt mixture, which adopts the following technical scheme that the method comprises the following steps: s1, weighing a specific gravity bottle to obtain a mass I ; S2, weighing the gravity bottle filled with water to obtain a second mass; S3, weighing a specific gravity bottle filled with a fiber sample to be measured to obtain a third mass; S4, filling the specific gravity bottle filled with the fiber sample to be tested with water, placing the specific gravity bottle in a vacuum container, placing water into the vacuum container, vacuumizing the vacuum container by using a vacuumizing device, taking out the specific gravity bottle after vacuumizing is finished, and weighing to obtain the mass IV; S5, calculating the density and the relative density of the fiber sample to be measured according to the following formula: Wherein, the The relative density of the fiber sample to be measured is dimensionless; The density of the fiber sample to be measured; The mass of the dried specific gravity bottle; Is the total mass of the gravity bottle and the full water; The total mass of the specific gravity bottle and the fiber sample to be measured is measured; The total mass of the gravity bottle, the filled fiber sample to be tested and the filled water; Is the density of water at a preset temperature; The vacuum pumping device comprises a base, a vibrating table and an air pump, wherein the vibrating table and the air pump are arranged on the base, the vacuum container comprises a mounting cylinder and a top cover, a bearing frame is arranged in the mounting cylinder, the bearing frame comprises a bearing plate for bearing a specific gravity bottle and a clamping frame for clamping the specific gravity bottle, a connecting block is fixed on the bottom surface of the bearing plate, a connecting groove for inserting the connecting block is formed in the bottom surface of the mounting cylinder, positioning grooves are formed in the inner side opposite to the connecting groove, positioning blocks are arranged in the mounting cylinder in a sliding mode along the radial direction of the positioning grooves, and fixing grooves for inserting the positioning blocks are formed in the two sides of the connecting block. Through adopting above-mentioned technical scheme, place the proportion bottle on the loading board, utilize the carriage to carry out the centre gripping to the proportion bottle, insert the connecting block again and establish in the spread groo