A device for detecting the expansion of hot smoldering slag immersed in water

Abstract

The present invention relates to the field of road engineering material testing, specifically a device for detecting the expansion of hot-stifling steel slag immersed in water. The device comprises a water bath housing, wherein an expansion rate measuring mechanism is disposed within the water bath housing. The device comprises an upper shell and a lower shell, both of which are water-permeable. The upper end of the upper shell is connected to an upper contraction section, the upper end of the upper contraction section is connected to an upper neck section, the upper end of the upper neck section is connected to an upper container; the lower end of the lower shell is connected to a lower contraction section, the lower end of the lower contraction section is connected to a lower neck section, the lower end of the lower neck section is connected to a lower container; the upper and lower containers are filled with measuring beads, a first solenoid valve is disposed at the upper portion of the upper neck section, and a second solenoid valve is disposed at the lower portion of the lower neck section. Volume scale lines are disposed on the upper and lower neck sections, and a drive mechanism is mounted on the water bath housing. The present invention utilizes the filling beads to measure the volume of a Marshall specimen, eliminating the need to remove the specimen for measurement, resulting in a fast and efficient testing process.

Description

Technical Field

[0001] The invention relates to the field of road engineering material testing, in particular to a device for detecting the expansion of hot-stifling steel slag immersed in water. Background Art

[0002] Steel slag, an industrial waste product, possesses excellent road construction properties and can replace stone as aggregate in asphalt mixtures, offering both environmental and economic benefits. Untreated steel slag typically contains quicklime, which hydrates and expands upon contact with water. This significantly limits its widespread application in road construction, necessitating research into the expansive properties of steel slag asphalt mixtures.

[0003] The conventional method for testing the water expansion of steel slag asphalt mixtures involves using a vernier caliper to measure the diameter and height of a Marshall specimen at three locations and four points, taking the average and calculating the volume. However, since specimens expand in all directions, this measurement method is prone to significant errors. To further improve testing accuracy, the specimens are wax-sealed and then the water displacement method is used to determine the specimen volume before and after immersion. However, this requires multiple measurements at different immersion time periods, and since at least three specimens are required, the wax sealing process is excessive, which is time-consuming and labor-intensive.

[0004] Patent publication number CN115096933B discloses a method for testing the performance of steel slag asphalt mixtures. This method uses a packaging mechanism, heat shrink film, and an air pipe nozzle to shrink-wrap the specimen around the perimeter. The volume is then measured using a water displacement method, eliminating the need for wax sealing and wax removal. This improves testing efficiency and reduces manual labor. However, this method requires the specimen to be removed from the water bath, wiped, and shrink-wrapped. After measurement, the shrink film must be removed and the specimen returned to the water bath for immersion. This is a complex procedure, and the surface of the asphalt mixture is prone to stickiness, making it difficult to remove the shrink film after wrapping, which can be inconvenient during testing. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for detecting the expansion of hot-stifling steel slag when immersed in water, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a device for detecting the expansion of hot-stifling steel slag immersed in water, comprising a water bath for immersing and heating a Marshall specimen in water, an expansion rate measuring mechanism being provided in the water bath, the expansion rate measuring mechanism comprising an upper shell and a lower shell for placing the Marshall specimen and being detachable up and down, the upper shell and the lower shell being water-permeable shells with mesh holes on the outer peripheral wall; an upper contraction section in the shape of a cone with a small upper portion and a large lower portion being connected to the upper end of the upper shell, an upper neck section being connected to the upper end of the upper neck section, and an upper containing body being connected to the lower end of the lower shell; a lower contraction section in the shape of an inverted cone with a small lower portion and a large upper portion being connected to the lower end of the lower shell, The lower end of the lower contraction section is connected to the lower neck section, and the lower end of the lower neck section is connected to the lower containing body; the upper containing body / the lower containing body are filled with measuring beads, and the measuring beads are steel balls with a diameter larger than the mesh aperture; the upper part of the upper neck section is provided with a first solenoid valve, and the lower part of the lower neck section is provided with a second solenoid valve; the upper neck section and the lower neck section are provided with mirror-image volume scale lines, and the water bath box is installed with a driving mechanism for driving the expansion rate measuring mechanism to flip; when the measuring beads fall between the second solenoid valve and the first solenoid valve and fill the periphery of the Marshall specimen, the measuring beads can sink to the upper neck section / the lower neck section.

[0007] Optionally, an electric heater and a temperature sensor are installed inside the water bath box, and a control box is installed outside the water bath box. The control box is electrically connected to the drive mechanism, the first solenoid valve, the second solenoid valve, the electric heater and the temperature sensor.

[0008] Optionally, a water inlet is provided on the upper side wall of the water bath body, and a water outlet is provided on the lower side wall of the water bath body; and the driving mechanism is a rotary cylinder.

[0009] Optionally, the left side wall of the lower shell is fixedly connected to a first rotating rod, and the right side wall of the lower shell is fixedly connected to a second rotating rod. The first rotating rod is rotatably connected to the left side wall of the water bath box and then connected to the output end of the driving mechanism, and the second rotating rod is rotatably connected to the right side wall of the water bath box.

[0010] Optionally, the upper shell is connected to an upper overlapping portion supported by a plurality of rod structures near the upper contraction section, and the lower shell is connected to a lower overlapping portion supported by a plurality of rod structures near the lower contraction section.

[0011] Optionally, the middle parts of the four inner side walls of the lower shell body, including the front, rear, left and right sides, are connected to limit cross bars, and the ends of the limit cross bars are connected to limit vertical bars.

[0012] Optionally, the height difference between the upper overlapping portion and the lower overlapping portion is not less than 80 mm; and the distance between the two limiting vertical rods arranged relative to the inner wall is not less than 130 mm.

[0013] Optionally, the diameter of the measuring beads ranges from 1 to 3 mm.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention incorporates a reversible expansion rate measuring mechanism within the water bath. The mechanism comprises water-permeable upper and lower shells, upper and lower contraction sections, upper and lower neck sections, and upper and lower containment bodies. The upper and lower containment bodies are filled with measuring beads, which are used to measure the volume of the Marshall specimen. The measurement process is fast and efficient, without the need to remove the specimen.

[0016] 2. During water bath heating of the specimen, the present invention stores the measuring bead in the upper / lower housing and seals it with the first / second solenoid valve. To measure the specimen volume, the upper first / second solenoid valve is opened, and after the measuring bead has completely fallen, the reading is taken at the upper / lower neck section. After the measurement is complete, the second / first solenoid valve is opened, and after the measuring bead has fallen into the lower / upper housing, the first and second solenoid valves are closed. Simultaneously, the expansion coefficient measuring mechanism is flipped 180 degrees. This ensures that heating and measurement do not interfere with each other, resulting in a continuous, simple, and efficient process.

[0017] 3. The present invention sets a limiting horizontal bar and a limiting vertical bar in the lower shell to avoid direct contact between the test piece and the side wall of the lower shell, which may cause the side of the test piece to not be detected in place; at the same time, an upper overlapping part and a lower overlapping part supported by a plurality of rod structures are set to make the top and bottom surfaces of the test piece completely exposed, avoiding the problem of the top and bottom surfaces not being detected in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the device for detecting expansion of hot-stifling steel slag immersed in water according to the present invention;

[0019] Figure 2 Schematic diagram of the expansion rate measuring mechanism in the hot-suffocating steel slag water immersion expansion detection device of the present invention;

[0020] Figure 3 It is a schematic diagram of the assembly of the hot-stifling steel slag water expansion detection device of the present invention.

[0021] In the figure: 1. Water bath box; 11. Water inlet; 12. Water outlet; 13. Electric heater; 14. Temperature sensor; 2. Box cover; 3. Marshall specimen; 4. Expansion rate measuring mechanism; 41. Upper shell; 411. Upper contraction section; 412. Upper neck section; 413. Upper containing body; 414. Upper overlapping part; 415. First solenoid valve; 42. Lower shell; 421. Lower contraction section; 422. Lower neck section; 423. Lower containing body; 424. Lower overlapping part; 425. Second solenoid valve; 426. Limit horizontal rod; 427. Limit vertical rod; 43. Measuring bead; 5. Rotating cylinder; 51. First rotating rod; 52. Second rotating rod; 53. Third rotating rod; 6. Control box. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Figure 1 It is a schematic diagram of the device for detecting expansion of hot-stifling steel slag immersed in water according to the present invention.

[0024] An embodiment of the present invention provides a device for detecting the expansion of hot-stifling steel slag by immersion in water. The device comprises a water bath 1 for immersing and heating a Marshall specimen 3 in water. The upper sidewall of the water bath 1 is provided with a water inlet 11, and the lower sidewall of the water bath 1 is provided with a water outlet 12. An electric heater 13 and a temperature sensor 14 are installed within the water bath 1. A control box 6 is installed outside the water bath 1. An expansion rate measuring mechanism 4 is also installed within the water bath 1. A drive mechanism for rotating the expansion rate measuring mechanism 4 is installed outside the water bath 1. The drive mechanism may be a rotary cylinder 5. The control box 6 is electrically connected to the drive mechanism, the electric heater 13, and the temperature sensor 14.

[0025] Figure 2 Schematic diagram of the expansion rate measuring mechanism 4 in the hot-suffocating steel slag immersion water expansion detection device of the present invention.

[0026] The expansion coefficient measuring mechanism 4 of the present invention comprises an upper shell 41 and a lower shell 42 for accommodating a Marshall specimen 3. Both upper shell 41 and lower shell 42 are water-permeable shells with mesh-shaped outer walls. The upper end of upper shell 41 is connected to an upper lap joint 414 supported by a plurality of rods, while the lower end of lower shell 42 is connected to a lower lap joint 424 supported by a plurality of rods. The upper and lower lap joints 414 and 424 can adopt a multi-rod cross structure or a multi-rod parallel structure. Before heating in a water bath, the upper shell 41 is opened, and the Marshall specimen 3 (101.6 mm x 63.5 mm) compacted using a Marshall compactor is placed on the lower lap joint 424 of the lower shell 42. The upper shell 41 is then closed and fixed to the lower shell 42. The fixing method can be a flange-type structure with bolts or a threaded connection at the joint. Furthermore, the upper end of the upper shell 41 is connected to an upper conical section 411, which is tapered at the top and larger at the bottom. The upper end of the upper conical section 411 is connected to an upper neck section 412, and the upper end of the upper neck section 412 is connected to an upper container 413. The lower end of the lower shell 42 is connected to a lower conical section 421, which is tapered at the bottom and larger at the top. The lower end of the lower conical section 421 is connected to a lower neck section 422, and the lower end of the lower neck section 422 is connected to a lower container 423. The upper container 413 and the lower container 423 are filled with measuring beads 43. The measuring beads 43 are steel balls with a diameter larger than the mesh aperture. To improve detection accuracy, the diameter of the steel balls should not be too large, and can be selected to be preferably between 1 and 3 mm. The upper and lower constricted sections 411, 421, the upper and lower neck sections 412, 422, and the upper and lower housings 413, 423 can also adopt a water-permeable shell structure with a mesh like the upper and lower shells 41, 42, or a transparent sealed shell structure. A first solenoid valve 415 is provided at the top of the upper neck section 412, and a second solenoid valve 425 is provided at the bottom of the lower neck section 422. Both the first solenoid valve 415 and the second solenoid valve 425 are electrically connected to the control box 6. Mirror-image volume scale lines are provided on the upper and lower neck sections 412, 422. The volume scale lines on the upper neck section 412 are calculated and marked from the far end second solenoid valve 425 through the lower neck section 422, the lower constricted section 421, the lower shell 42, the upper shell 41, the upper constricted section 411, and the upper neck section 412. The volume scale lines on the lower neck section 422 can be set similarly. The number of the measuring beads 43 can be set such that when the measuring beads 43 fall between the second solenoid valve 425 and the first solenoid valve 415 and fill the periphery of the Marshall specimen 3 , the measuring beads 43 can not reach the upper neck section 412 / the lower neck section 422 .

[0027] On the basis of the above embodiment, the left side wall of the lower shell 42 is fixedly connected to the first rotating rod 51, and the right side wall of the lower shell 42 is fixedly connected to the second rotating rod 52. The first rotating rod 51 is rotatably connected to the left side wall of the water bath box 1 and then connected to the output end of the driving mechanism, and the second rotating rod 52 is rotatably connected to the right side wall of the water bath box 1.

[0028] Based on the above embodiment, the middle portions of the four inner sidewalls of the lower housing 42, front, back, left, and right, are connected to limit cross bars 426, and the ends of the limit cross bars 426 are connected to limit vertical bars 427. To improve testing accuracy and facilitate specimen placement, the height difference between the upper and lower overlapping portions 414, 424 is no less than 80 mm; the spacing between the two limit vertical bars 427, located on opposing inner sidewalls, is no less than 130 mm.

[0029] Figure 3 It is a schematic diagram of the assembly of the hot-stifling steel slag water expansion detection device of the present invention.

[0030] To reduce specimen fabrication and testing errors, Marshall specimens 3 are typically fabricated in multiple groups for waterbath heating and volume testing. This embodiment uses three groups as an example. Three expansion rate measuring mechanisms 4 can be installed within a single waterbath chamber 1. The left side of the leftmost expansion rate measuring mechanism 4 is driven by a first rotating rod 51, while the right side of the rightmost expansion rate measuring mechanism 4 is axially constrained by a second rotating rod 52. Each pair of expansion rate measuring mechanisms 4 is connected by a third rotating rod 53 for coordinated rotation. This arrangement allows simultaneous heating and testing of three groups of specimens, significantly improving testing efficiency.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting expansion of hot slag by immersion in water, comprising a water bath (1) for immersing and heating a Marshall specimen (3), characterized in that: The water bath box (1) is provided with an expansion rate measuring mechanism (4), and the expansion rate measuring mechanism (4) includes an upper shell (41) and a lower shell (42) for placing a Marshall specimen (3) and being detachable up and down, and the upper shell (41) and the lower shell (42) are both water-permeable shells with mesh holes on the outer peripheral wall; the upper end of the upper shell (41) is connected to an upper contraction section (411) in the shape of a cone with a small upper portion and a large lower portion, the upper end of the upper contraction section (411) is connected to an upper neck section (412), and the upper end of the upper neck section (412) is connected to an upper containing body (413); the lower end of the lower shell (42) is connected to a lower contraction section (421) in the shape of an inverted cone with a small lower portion and a large upper portion, the lower end of the lower contraction section (421) is connected to a lower neck section (422), and the lower end of the lower neck section (422) is connected to a lower containing body (413). 23); the upper containing body (413) / the lower containing body (423) are filled with measuring beads (43), the measuring beads (43) are steel balls with a diameter larger than the mesh aperture, the upper portion of the upper neck section (412) is provided with a first electromagnetic valve (415), the lower portion of the lower neck section (422) is provided with a second electromagnetic valve (425), the upper neck section (412) and the lower neck section (422) are provided with mirror-image volume scale lines, and the water bath box (1) is equipped with a driving mechanism for driving the expansion rate measuring mechanism (4) to flip; when the measuring beads (43) fall between the second electromagnetic valve (425) and the first electromagnetic valve (415) and fill the periphery of the Marshall specimen (3), the measuring beads (43) can be submerged in the upper neck section (412) / the lower neck section (422).

2. The device for detecting expansion of hot-stifling steel slag immersed in water according to claim 1, characterized in that: An electric heater (13) and a temperature sensor (14) are installed in the water bath box (1), and a control box (6) is installed outside the water bath box (1). The control box (6) is electrically connected to the drive mechanism, the first solenoid valve (415), the second solenoid valve (425), the electric heater (13), and the temperature sensor (14).

3. The device for detecting expansion of hot-stifling steel slag immersed in water according to claim 2, characterized in that: The upper portion of the side wall of the water bath box (1) is provided with a water inlet (11), and the lower portion of the side wall of the water bath box (1) is provided with a water outlet (12); the driving mechanism is a rotary cylinder (5).

4. The device for detecting expansion of hot-stifling steel slag immersed in water according to claim 1, characterized in that: The left side wall of the lower shell (42) is fixedly connected to a first rotating rod (51), and the right side wall of the lower shell (42) is fixedly connected to a second rotating rod (52). The first rotating rod (51) is rotatably connected to the left side wall of the water bath body (1) and then connected to the output end of the driving mechanism. The second rotating rod (52) is rotatably connected to the right side wall of the water bath body (1).

5. The device for detecting expansion of hot-stifling steel slag immersed in water according to claim 1, characterized in that: The upper shell (41) is connected to an upper overlap portion (414) supported by a plurality of rod structures near the upper contraction section (411), and the lower shell (42) is connected to a lower overlap portion (424) supported by a plurality of rod structures near the lower contraction section (421).

6. The device for detecting expansion of hot-stifling steel slag immersed in water according to claim 5, characterized in that: The middle portions of the four inner side walls of the lower shell (42) are all connected to a limiting cross bar (426), and the ends of the limiting cross bar (426) are connected to a limiting vertical bar (427).

7. The device for detecting expansion of hot-stifling steel slag immersed in water according to claim 6, characterized in that: The height difference between the upper overlapping portion (414) and the lower overlapping portion (424) is not less than 80 mm; and the distance between the two limiting vertical rods (427) arranged relative to the inner side wall is not less than 130 mm.

8. The device for detecting expansion of hot-stifling steel slag immersed in water according to claim 1, characterized in that: The diameter of the measuring beads (43) ranges from 1 to 3 mm.

Images