Test apparatus for saturated surface dry water absorption rate of fine aggregate

Abstract

This utility model provides a device for testing the saturated surface-dry water absorption rate of fine aggregates, belonging to the technical field of fine aggregate testing. It includes a smooth flat plate, a saturated surface-dry mold, a tamping rod, a heating mechanism, and a drying oven. The saturated surface-dry mold is placed on the smooth flat plate. The heating mechanism includes multiple heating plates; the bottom surface of each heating plate is connected to the smooth flat plate, and the top surface has a support groove for supporting the drying oven. The drying oven includes a furnace body, an upper cover, a handle, a lower cover, and a sealing component. The furnace body includes an upper furnace opening, a furnace chamber, and a lower furnace opening connected in sequence. The upper cover is installed outside the upper furnace opening of the furnace body and has a feeding port. The bottom end of the handle is connected to the upper cover. The lower cover is installed outside the lower furnace opening of the furnace body and has a discharge port, which is sealed by the sealing component. This device is simple to manufacture, requires few materials, and can greatly improve the efficiency of saturated surface-dry water absorption rate testing, making it extremely valuable for widespread application.

Description

Technical Field

[0001] This utility model belongs to the technical field of fine aggregate testing, and specifically discloses a test device for the saturated surface dry water absorption rate of fine aggregate. Background Technology

[0002] The saturated surface-dry water absorption rate of fine aggregates is an important indicator for judging their pore structure and water adsorption capacity, directly affecting the workability and durability of concrete. The test procedure follows the "Test Procedures for Aggregates in Highway Engineering" (JTG3432-2024) T0330-2024, "Test of Fine Aggregate Density and Water Absorption (Slump Cone Method)". Currently, there are many inconvenient aspects to the saturated surface-dry water absorption rate test for fine aggregates that need improvement.

[0003] 1. When using a handheld blower to blow air over aggregate particles, it is easy to blow away the fine powder of the aggregate, and the heating is uneven.

[0004] 2. When the aggregate is loosely loaded into the saturated surface-dry mold at once, it is easy to scatter and is inconvenient to operate;

[0005] 3. Excess material after leveling the die opening falls onto the smooth surface and is difficult to clean;

[0006] 4. The distance between the bottom of the tamping rod and the surface of the aggregate cannot be guaranteed to be no more than 5mm, and it cannot be guaranteed to fall freely under its own weight. Utility Model Content

[0007] This invention provides a device for testing the saturated surface dry water absorption rate of fine aggregates, thereby improving at least one technical problem in the background art.

[0008] The aforementioned fine aggregate saturated surface-dry water absorption rate test device includes a smooth flat plate, a saturated surface-dry mold, a tamping rod, a heating mechanism, and a drying oven. The saturated surface-dry mold is placed on the smooth flat plate. The heating mechanism includes multiple heating plates. The bottom surface of the heating plates is connected to the smooth flat plate, and the top surface is provided with a support groove for supporting the drying oven. The drying oven includes a furnace body, an upper cover, a handle, a lower cover, and a sealing component. The furnace body includes an upper furnace opening, a furnace chamber, and a lower furnace opening connected in sequence. The upper cover is installed outside the upper furnace opening of the furnace body and is provided with a feeding port. The bottom end of the handle is connected to the upper cover. The lower cover is installed outside the lower furnace opening of the furnace body and is provided with a discharge port, which is sealed by the sealing component.

[0009] In the above-mentioned fine aggregate saturated surface dry water absorption rate test device, the diameter of the furnace gradually decreases from the middle to both ends, and the diameters of the upper furnace opening and the lower furnace opening are equal; the support groove is an arc-shaped groove with a diameter equal to the diameters of the upper furnace opening and the lower furnace opening.

[0010] In the above-mentioned fine aggregate saturated surface dry water absorption rate test device, the handle includes a vertical beam I and a horizontal beam I. The bottom end of the vertical beam I is connected to the top cover, and the top end of the vertical beam I is connected to the horizontal beam I. The sealing component includes a sealing plug, a sealing plate, and a handle. The diameter of the sealing plug is equal to the inner diameter of the discharge port. The diameter of the sealing plate is equal to the outer diameter of the discharge port, and the top surface of the sealing plate is connected to the bottom surface of the sealing plug. The handle includes a vertical beam II and a horizontal beam II. The top end of the vertical beam II is connected to the bottom surface of the sealing plate, and the bottom end of the vertical beam II is connected to the horizontal beam II.

[0011] The aforementioned fine aggregate saturated surface dry water absorption rate test device further includes a collection mechanism and a drying furnace support; the collection mechanism includes a positioning ring, a baffle ring, and a collection box; the baffle ring is installed on the outer edge of the positioning ring and has a discharge port; the collection box is installed on the positioning ring and has a feed port on its top surface; the collection mechanism is fitted onto the saturated surface dry test mold through the positioning ring, and the discharge port is inclined downwards; the drying furnace support includes an upper support ring, a lower support ring, and a support beam connecting the upper support ring and the lower support ring; the lower support ring is placed on a smooth flat plate and fitted onto the outside of the saturated surface dry test mold; the upper support ring is supported outside the drying furnace.

[0012] The aforementioned fine aggregate saturated surface dry water absorption rate test device also includes a tamping rod light tamping mechanism; the tamping rod light tamping mechanism includes a base, a tamping rod frame, a rotating shaft, a drum, a motor, a traction rope, and an electromagnetic chuck; the base is detachably mounted on a smooth flat plate; the tamping rod frame includes a vertical beam III and a horizontal beam III, the bottom end of the vertical beam III is rotatably connected to the base, and the top end of the vertical beam III is connected to the horizontal beam III; the rotating shaft is rotatably mounted on the end of the horizontal beam III; the drum is rotatably mounted on the horizontal beam III and is driven to rotate by a motor; the traction rope is led out from the drum, passes around the rotating shaft, and its bottom end is connected to the electromagnetic chuck; the top end of the tamping rod is made of magnetic material.

[0013] In the above-mentioned fine aggregate saturated surface dry water absorption rate test device, a limiting groove is provided in the circumference of the rotating shaft; the traction rope is arranged along the limiting groove.

[0014] In the above-mentioned fine aggregate saturated surface dry water absorption rate test device, the base is a magnetic base; a magnetic area is provided on the smooth flat plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Load the fine aggregate into the drying oven, and then place the drying oven in the support groove of the heating plate. The heating plate heats the drying oven and the fine aggregate inside, ensuring uniform heating and avoiding the problem of blowing away the fine aggregate powder when drying the aggregate particles with a hand-held blower.

[0017] 2. Place the drying oven on the drying oven support, align the discharge port of the drying oven support with the opening on the top surface of the saturated surface dry test mold, and then open the sealing part on the discharge port. The fine aggregate in the drying oven can then fall accurately into the saturated surface dry test mold without easily scattering, making the operation convenient.

[0018] 3. Fine aggregates scattered during unloading and excess fine aggregates after scraping the die opening fall into the collection mechanism for centralized collection, which is more convenient.

[0019] 4. Adjust the height of the tamping rod by the motor to ensure that the distance between the bottom of the tamping rod and the surface of the fine aggregate does not exceed 5mm. When the electromagnetic chuck is de-energized, the magnetism disappears, ensuring that the tamping rod falls freely under its own weight. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the structure of the test device for the saturated surface-dry water absorption rate of fine aggregates;

[0022] Figure 2 for Figure 1 A view from another direction;

[0023] Figure 3 This is a schematic diagram of the drying oven.

[0024] Figure 4 This is a structural diagram of the sealing component;

[0025] Figure 5 This is a schematic diagram of the collection mechanism.

[0026] In the diagram: 1-Smooth flat plate; 2-Saturated surface-dry mold; 3-Tapping rod;

[0027] 4.1 Heating plate; 4.2 Heating switch panel; 4.3 Heating switch;

[0028] 5.1-Furnace body; 5.2-Upper cover; 5.3-Handle; 5.4-Lower cover; 5.5.1-Sealing plug; 5.5.2-Sealing plate; 5.5.3-Handle;

[0029] 6.1-Positioning ring; 6.2-Blocking ring; 6.3-Collection box;

[0030] 7.1 - Upper support ring; 7.2 - Lower support ring; 7.3 - Support beam;

[0031] 8.1-Base; 8.2-Tapping rod frame; 8.3-Spindle; 8.4-Drum; 8.5-Motor; 8.6-Traction rope; 8.7-Electromagnetic chuck. Detailed Implementation

[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] Example 1

[0034] This embodiment provides a device for testing the saturated surface dry water absorption rate of fine aggregates, including a smooth flat plate 1, a saturated surface dry test mold 2, a tamping rod 3, a heating mechanism, and a drying oven. The saturated surface dry test mold 2 is placed on the smooth flat plate 1. The heating mechanism includes multiple heating plates 4.1. The bottom surface of the heating plates 4.1 is connected to the smooth flat plate 1, and the top surface is provided with a support groove for supporting the drying oven. The drying oven includes a furnace body 5.1, an upper cover 5.2, a handle 5.3, a lower cover 5.4, and a sealing component. The furnace body 5.1 includes an upper furnace opening, a furnace chamber, and a lower furnace opening connected in sequence. The upper cover 5.2 is installed outside the upper furnace opening of the furnace body 5.1 and is provided with a feeding port. The bottom end of the handle 5.3 is connected to the upper cover 5.2. The lower cover 5.4 is installed outside the lower furnace opening of the furnace body 5.1 and is provided with a discharge port, which is sealed by the sealing component.

[0035] In furnace body 5.1, the diameter of the furnace chamber gradually decreases from the middle to both ends, and the diameters of the upper and lower furnace openings are equal; the support groove is an arc-shaped groove with a diameter equal to that of the upper and lower furnace openings. The above structure in furnace body 5.1 allows fine aggregates to concentrate in the furnace chamber during heating, resulting in uniform heating.

[0036] The handle 5.3 includes a vertical beam I and a horizontal beam I. The bottom end of the vertical beam I is connected to the top cover 5.2, and the top end of the vertical beam I is connected to the horizontal beam I. The sealing component includes a sealing plug 5.5.1, a sealing plate 5.5.2, and a handle 5.5.3. The diameter of the sealing plug 5.5.1 is equal to the inner diameter of the discharge port. The diameter of the sealing plate 5.5.2 is equal to the outer diameter of the discharge port, and the top surface of the sealing plate 5.5.2 is connected to the bottom surface of the sealing plug 5.5.1. The handle 5.5.3 includes a vertical beam II and a horizontal beam II. The top end of the vertical beam II is connected to the bottom surface of the sealing plate 5.5.2, and the bottom end of the vertical beam II is connected to the horizontal beam II.

[0037] A heating switch panel 4.2 is provided on the heating plate 4.1, and a heating switch 4.3 is provided on the heating switch panel 4.2.

[0038] The aforementioned fine aggregate saturated surface dry water absorption rate test device further includes a collection mechanism and a drying furnace support. The collection mechanism includes a positioning ring 6.1, a baffle ring 6.2, and a collection box 6.3. The baffle ring 6.2 is installed on the outer edge of the positioning ring 6.1 and has a discharge port. The collection box 6.3 is installed on the positioning ring 6.1 and has a feed port on its top surface. The collection mechanism is fitted onto the saturated surface dry test mold via the positioning ring 6.1, and the discharge port is inclined downward so that the fine aggregate scattered in the positioning ring 6.1 and the baffle ring 6.2 can enter the collection box 6.3. The drying furnace support includes an upper support ring 7.1, a lower support ring 7.2, and a support beam 7.3 connecting the upper support ring 7.1 and the lower support ring 7.2. The lower support ring 7.2 is placed on a smooth flat plate 1 and fitted onto the outside of the saturated surface dry test mold 2. The upper support ring 7.1 is supported outside the drying furnace.

[0039] The aforementioned fine aggregate saturated surface dry water absorption rate test device also includes a tamping rod light tamping mechanism; the tamping rod light tamping mechanism includes a base 8.1, a tamping rod frame 8.2, a rotating shaft 8.3, a drum 8.4, a motor 8.5, a traction rope 8.6, and an electromagnetic chuck 8.7; the base 8.1 is detachably mounted on a smooth flat plate 1; the tamping rod frame 8.2 includes a vertical beam III and a horizontal beam III, the bottom end of the vertical beam III is rotatably connected to the base 8.1, and the top end of the vertical beam III is connected to the horizontal beam III; the rotating shaft 8.3 is rotatably mounted on the end of the horizontal beam III; the drum 8.4 is rotatably mounted on the horizontal beam III and is driven to rotate by the motor 8.5; the traction rope 8.6 is led out from the drum 8.4, passes around the rotating shaft 8.3, and its bottom end is connected to the electromagnetic chuck 8.7; the top end of the tamping rod 3 is made of magnetic material.

[0040] In the above-mentioned tamping rod light tamping mechanism, a limiting groove is provided in the circumference of the rotating shaft 8.3; the traction rope 8.6 is arranged along the limiting groove, thereby limiting the position of the traction rope 8.6 and preventing the traction rope 8.6 from swinging axially on the rotating shaft 8.3.

[0041] In the above-mentioned tamping rod light tamping mechanism, the base 8.1 is a magnetic base; a magnetic area is provided on the smooth flat plate 1; the bottom end of the vertical beam III is rotatably connected to the base 8.1 through the rotating rod 8.8.

[0042] The working process of the above-mentioned fine aggregate saturated surface dry water absorption rate test device is as follows:

[0043] The fine aggregate saturated surface dry water absorption rate test device is used according to Figure 1 and 2After assembly, add a portion of the cleaned and soaked fine aggregate through the feed inlet of the drying oven. Place the drying oven horizontally on the heating plate 4.1, turn on the heating switch 4.3 of the heating plate 4.1, and simultaneously rotate the handle 5.3 of the drying oven to ensure the fine aggregate is heated evenly until it reaches a saturated surface-dry state. Turn off the heating switch 4.3 and continue rotating the handle 5.3 of the drying oven to allow the fine aggregate to cool evenly to room temperature. Lift the drying oven and place it on the drying oven support. Adjust the position of the drying oven support so that the discharge port of the drying oven is aligned with the center of the opening on the top surface of the saturated surface-dry test mold 2. Open the sealing piece to allow the fine aggregate to be loosely and completely loaded into the saturated surface-dry test mold 2. Close the sealing piece. Excess fine aggregate flows into the collection box 6.3 through the positioning ring 6.1 and the baffle ring 6.2. Place the drying oven on the heating plate 4.1, remove the drying oven support, and place the tamping... Rotate the rod holder 8.2 90 degrees to align the tamping rod 3 with the center of the opening on the top surface of the saturated surface-dry test mold 2. Adjust the distance between the bottom of the tamping rod 3 and the surface of the fine aggregate to no more than 5 mm using the motor 8.5. After reaching the specified height, de-energize the electromagnetic chuck 8.7, disengage the tamping rod 3 from the electromagnetic chuck 8.7, and allow the tamping rod 3 to fall freely under its own weight. After energizing the electromagnetic chuck 8.7, lift the tamping rod 3. Gently tamp the surface of the fine aggregate particles evenly 25 times. After tamping, lift the tamping rod 3 again using the electromagnetic chuck 8.7. Rotate the tamping rod holder 8.2 90 degrees to smooth the mold opening, allowing excess fine aggregate to flow into the collection box 6.3 through the positioning ring 6.1 and the baffle ring 6.2. Remove the collection mechanism from the saturated surface-dry test mold 2 and remove the tamping rod mechanism. Slowly and vertically lift the saturated surface-dry test mold 2. Repeat the test until the fine aggregate particles reach the saturated surface-dry state.

[0044] Example 2

[0045] This embodiment provides a test device for the saturated surface dry water absorption rate of fine aggregates. The device is mainly made of stainless steel and has specific dimensions.

[0046] Smooth flat plate 1: Length 40cm, Width 20cm, Height 0.5cm.

[0047] Saturated surface dry test mold 2: bottom inner diameter 9cm, height 7.5cm, top opening inner diameter 4cm.

[0048] Tamping rod 3: Height 19.4cm, diameter 1.5cm, tamping end (bottom) diameter 2.5cm, height 2.7cm.

[0049] Heating mechanism: The heating plate 4.1 is 7.6cm long, 1cm wide, and 10cm thick, with a support groove diameter of 7.6cm; the heating switch panel 4.2 is 2cm long and 0.5cm thick; the heating switch 4.3 is 0.5cm long and 0.5cm wide, and 1cm thick.

[0050] Drying oven: furnace chamber height 14cm, furnace chamber height 9.28cm, furnace opening diameter 7.6cm, furnace wall thickness 0.3cm; upper cover 5.2 diameter 7.6cm, thickness 0.5cm, feeding port outer diameter 3.4cm, thickness 0.2cm, height 1cm, vertical beam I diameter 1.6cm, length 6cm, cross beam I length 5cm, side length 0.5cm, lower cover 5.4 diameter 7.6cm, thickness 0.5cm, unloading port outer diameter 3.4cm, thickness 0.2cm, height 1cm, sealing plug 5.5.1 diameter 3cm, height 0.5cm, sealing plate 5.5.2 diameter 3.4cm, thickness 0.5cm, vertical beam II diameter 1cm, height 1cm, cross beam II length 3cm, width 0.4cm, height 0.5cm.

[0051] Collection mechanism: The outer diameter of the positioning ring 6.1 is 11.34cm, the inner diameter is 8cm, and the thickness is 0.2cm; the height of the baffle ring 6.2 is 1.2cm and the thickness is 0.2cm; the height of the discharge port is 1cm and the width is 0.5cm; the length of the collection box 6.3 is 3.4cm, the width is 2.4cm, and the height is 2.2cm, and the plate thickness of the collection box 6.3 is 0.2cm; the collection mechanism is tilted vertically downwards by 3 degrees.

[0052] Drying oven support frame: lower support ring 7.2 has an outer diameter of 14cm, an inner diameter of 12cm, and a thickness of 0.5cm; upper support ring 7.1 has an outer diameter of 9.62cm, an inner diameter of 7.62cm, and a thickness of 0.5cm; support beam 7.3 has a side length of 0.5cm and a length of 15.65cm.

[0053] The tamping rod light tamping mechanism consists of: a base 8.1 with a side length of 3cm and a thickness of 1cm; a rotating rod 8.8 with a diameter of 2cm and a height of 2cm; a vertical beam III with a side length of 2cm and a height of 32cm; a horizontal beam III with a side length of 2cm and a length of 9.15cm; a rotating shaft 8.3 with a diameter of 0.5cm, a length of 2cm, and a limiting groove of 0.1cm; an electromagnetic chuck 8.7 with a side length of 1.5cm and a height of 1cm; and a traction rope 8.6 with a diameter of 0.1cm.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A device for testing the saturated surface-dry water absorption rate of fine aggregates, comprising a smooth flat plate, a saturated surface-dry mold, and a tamping rod; wherein the saturated surface-dry mold is placed on the smooth flat plate; characterized in that It also includes heating mechanisms and drying ovens; The heating mechanism includes multiple heating plates; The bottom surface of the heating plate is connected to the smooth flat plate, and the top surface is provided with a support groove for supporting the drying oven. The drying oven includes a furnace body, an upper cover, a handle, a lower cover, and a sealing component; The furnace body includes an upper furnace opening, a furnace chamber, and a lower furnace opening connected in sequence. The upper cover is installed outside the upper furnace opening of the furnace body and is provided with a feeding port; The bottom end of the handle is connected to the top cover; The lower cover is installed outside the lower furnace opening of the furnace body and is provided with a discharge port, which is sealed by a sealing component.

2. The fine aggregate saturated surface dry water absorption rate test device according to claim 1, characterized in that, The diameter of the furnace chamber gradually decreases from the middle to both ends, and the diameters of the upper furnace opening and the lower furnace opening are equal. The support groove is an arc-shaped groove with a diameter equal to the diameter of the upper and lower furnace openings.

3. The fine aggregate saturated face dry absorption test device according to claim 2, wherein The handle includes a vertical beam I and a horizontal beam I, the bottom end of the vertical beam I is connected to the top cover, and the top end of the vertical beam I is connected to the horizontal beam I; the sealing component includes a sealing plug, a sealing plate, and a handle; The diameter of the sealing plug is equal to the inner diameter of the discharge port; The diameter of the sealing plate is equal to the outer diameter of the discharge port, and the top surface of the sealing plate is connected to the bottom surface of the sealing plug. The handle includes a vertical beam II and a horizontal beam II. The top of the vertical beam II is connected to the bottom surface of the sealing plate, and the bottom of the vertical beam II is connected to the horizontal beam II.

4. The fine aggregate saturated face dry water absorption test device according to claim 1, characterized by, It also includes a collection mechanism and a drying oven support; The collection mechanism includes a positioning ring, a baffle ring, and a collection box; The baffle ring is installed on the outer edge of the positioning ring and is provided with a discharge port; The collection box is mounted on the positioning ring and has a feed inlet on its top surface; The collection mechanism is fitted onto the saturated surface dry test mold via a positioning ring, and the discharge port is tilted downwards; The drying oven support includes an upper support ring, a lower support ring, and a support beam connecting the upper and lower support rings; the lower support ring is placed on a smooth flat plate and fitted outside the saturated surface drying test mold; the upper support ring is supported outside the drying oven.

5. The fine aggregate saturated face dry absorption test device according to claim 4, wherein It also includes a tamping mechanism; The tamping rod light tamping mechanism includes a base, a tamping rod frame, a rotating shaft, a drum, a motor, a traction rope, and an electromagnetic chuck; the base is detachably mounted on a smooth flat plate; The tamping rod frame includes a vertical beam III and a horizontal beam III. The bottom end of the vertical beam III is rotatably connected to the base, and the top end of the vertical beam III is connected to the horizontal beam III. The rotating shaft is rotatably mounted at the end of the crossbeam III; The drum is rotatably mounted on the crossbeam III and is driven to rotate by a motor; The traction rope is led out from the drum, passes around the rotating shaft, and its bottom end is connected to the electromagnetic chuck. The tip of the tamping rod is made of magnetic material.

6. The fine aggregate saturated face dry absorption test device according to claim 5, wherein The rotating shaft is provided with a limit groove in its circumferential direction; The traction rope is arranged along the limiting groove.

7. The fine aggregate saturated face dry absorption test device according to claim 5, wherein The base is a magnetic base; A magnetic area is provided on the smooth flat plate.

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