A test system and method for water stability of granite crushed stone asphalt concrete

Abstract

This invention discloses a water stability testing system and method for granite crushed stone asphalt concrete, relating to the field of water stability testing technology. The granite crushed stone asphalt concrete water stability testing system includes a molding module, a negative pressure immersion module, and a pressure application module. The molding module includes a molding mold; the negative pressure immersion module includes a housing, a negative pressure air pump, and a water storage tank. A first bottom mold can selectively be fitted and connected to a second bottom mold or the water storage tank, respectively used for molding or wetting the test sample. In this invention, demolding of the circumferential surface of the test sample is no longer performed in the early stage; instead, the sealing state between the test sample and the side mold is maintained until the negative pressure immersion process. On the one hand, it eliminates the need to rebuild the sealing structure for the circumferential surface of the test sample, reducing operational steps and improving operational efficiency. On the other hand, the reduced adhesion between the wetted test sample and the side mold reduces the difficulty of subsequent mold opening.

Description

Technical Field

[0001] This invention relates to the field of water stability testing technology, specifically to a water stability testing system and method for granite crushed stone asphalt concrete. Background Technology

[0002] Using granite to replace limestone, basalt, and other aggregates as aggregates, and combining it with asphalt and concrete to form mixtures, is an emerging engineering material.

[0003] Water stability refers to the degree to which a substance is affected by water, and it is one of the commonly used indicators in the performance evaluation of a mixture. During the water stability test, the mixture needs to be molded first, and its saturated compressive strength is tested after it has hardened into a block.

[0004] In traditional techniques, molds are typically used to shape the mixture. However, as the concrete hardens, it adheres tightly to the mold, making demolding difficult. Furthermore, in negative pressure immersion operations, a seal needs to be applied to the circumference of the concrete (to allow as much water as possible to flow into the pores inside the mixture rather than bypassing it). Therefore, the process of first breaking the seal on the circumference of the mixture (i.e., the demolding process) and then rebuilding the seal involves repetitive work. Both demolding and rebuilding the seal are quite difficult, resulting in cumbersome procedures and low efficiency. Summary of the Invention

[0005] In order to overcome the problem of "difficulty in demolding the mixture and difficulty in rebuilding the sealing structure after demolding" in the above-mentioned background technology, the present invention provides a water stability test system and test method for granite crushed stone asphalt concrete.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A water stability testing system for granite crushed stone asphalt concrete includes a molding module, a negative pressure immersion module, and a pressure application module. The molding module includes a molding die for forming a pouring cavity, comprising side molds formed by a first side mold and a second side mold, and also includes a first bottom mold and a second bottom mold. The first side mold and the second side mold are detachably connected. The top surface of the first bottom mold is detachably connected to the bottom surface of the side molds. The first bottom mold has a first opening communicating with the pouring cavity. The second bottom mold is used to seal the first opening. The negative pressure immersion module includes a housing, a negative pressure air pump, and a water storage tank. The negative pressure air pump is connected to the first cavity within the housing. The water storage tank is connected to a second cavity containing water. The cover can be fastened to the top surface of the molding mold to apply negative pressure to the top of the casting cavity. The water storage tank can be fastened to the bottom surface of the first bottom mold to supply water to the bottom of the casting cavity. The first bottom mold can be selectively adapted to the second bottom mold or the water storage tank for molding or wetting the test sample, respectively. When the concrete in the test sample hardens, it can fit against the inner wall of the casting cavity to seal the outer wall of the test sample and the inner wall of the molding mold during wetting. After the test sample is wetted, the demolding force required to remove the molding mold can be reduced.

[0007] As a further optimization of the present invention, the top surface of the second bottom mold is provided with an upper protrusion; when the first bottom mold is connected to the second bottom mold, the upper protrusion is adapted to be inserted into the first hole, and the top surface of the upper protrusion is coplanar with the top surface of the first bottom mold.

[0008] As a further optimization of the present invention, the negative pressure immersion module further includes a water supply pipe and a water storage tank for supplying water to the water storage tank; one end of the water supply pipe is connected to the water storage tank and the other end is connected to the water storage tank.

[0009] As a further optimization of the present invention, a drain pipe is installed at the bottom of the side wall of the water storage tank, and a first valve body is installed on the drain pipe; a second valve body is provided at the end of the water supply pipe near the water storage tank.

[0010] As a further optimization of the present invention, the pressure application module includes a base, with a first pressure plate and a second pressure plate above the base; the cover is fixedly installed on the bottom surface of the first pressure plate; the water storage tank is disposed inside the base and located below the first pressure plate; the first pressure plate can press down on the cover, so that the bottom surface of the cover is pressed and sealed with the top surface of the side mold, and the bottom surface of the first bottom mold is pressed and sealed with the top surface of the water storage tank, for wetting the sample to be tested.

[0011] As a further optimization of the present invention, the second pressure plate can press the test sample downwards to detect the compressive strength of the test sample.

[0012] As a further optimization of the present invention, the top surface of the base is provided with an upper convex rib, a first support surface and a second support surface, the first support surface and the second support surface are respectively provided on both sides of the upper convex rib, and the second support surface is provided with a support platform for supporting the test sample upward, the support platform being located below the second pressure plate; when the bottom surface of the first bottom mold is pressed against the first support surface, the top surface of the first bottom mold, the top surface of the upper convex rib and the top surface of the support platform are coplanar, and the test sample after being wetted can slide from the top surface of the first bottom mold to the top surface of the support platform.

[0013] As a further optimization of the present invention, a vertical partition is provided above the base, and one edge of the partition is perpendicular to and rotatably connected to the top surface of the upper convex rib; the partition is rotatable; when the partition is parallel to the upper convex rib, it is used to prevent debris generated when the test sample is crushed under pressure from splashing into the water storage tank; when the partition is perpendicular to the upper convex rib, it is used to make way for the test sample sliding from the first bottom mold to the support platform.

[0014] As a further optimization of the present invention, the outer edge of the upper surface of the first support surface is provided with a C-shaped water-blocking rib, and the two ends of the water-blocking rib are respectively connected to the two ends of the upper rib to form a water storage tank; when the side mold is separated from the cover, the water originally stored in the first cavity flows down along the outer surface of the side mold to enter the water storage tank.

[0015] A method for testing the water stability of granite crushed stone asphalt concrete, comprising using the aforementioned granite crushed stone asphalt concrete water stability testing system to conduct water stability tests on the test samples, including the following steps: S1, assembling two molding molds, spraying a release agent onto the inner surface of the pouring cavity of one molding mold, while not spraying a release agent onto the inner surface of the pouring cavity of the other molding mold; S2, pouring a mixture into the two pouring cavities; the mixture includes granite crushed stone, asphalt, and concrete; S3, hardening the mixture to obtain the two test samples; S4. S5. Open the mold with the release agent sprayed on it to obtain the unwetted test sample; S6. Remove the second bottom mold from the mold without the release agent sprayed on it and place it on the first support surface to wet the test sample; at the same time, place the unwetted test sample on the support platform to test the compressive strength; S7. Remove the first side mold and the second side mold on the outer periphery of the wetted test sample, and then slide the wetted test sample from the first bottom mold onto the support platform to test the compressive strength; S8. Calculate the water stability coefficient.

[0016] In summary, the present invention has at least one of the following advantages: (1) In this invention, the demolding of the circumferential surface of the test sample is no longer performed in the early stage. Instead, the sealing state between the test sample and the side mold is retained until the negative pressure water immersion process. On the one hand, there is no need to rebuild the sealing structure for the circumferential surface of the test sample, which reduces the operation steps and improves the operation efficiency. On the other hand, the adhesion between the test sample and the side mold is reduced after wetting, which reduces the difficulty of mold opening in the later stage. On the third hand, the amount of release agent used is reduced.

[0017] (2) The first bottom mold can be selectively adapted and connected to the second bottom mold or the water tank, respectively for molding or wetting of the test sample, which can realize convenient and quick switching of the working state of the molding mold, thereby improving the work efficiency.

[0018] (3) The cover, side mold, first bottom mold and water tank are pressed together in sequence using the first pressure plate. The pressing has the technical characteristics of quick connection and disassembly, which can facilitate the layout, sealing connection and disassembly of the first cavity, casting cavity and second cavity; realize the coordinated use of the molding module, negative pressure immersion module and pressure module, and improve the convenience and efficiency of operation.

[0019] (4) The top surface of the first bottom mold, the top surface of the upper convex rib and the top surface of the foundation are set in a coplanar manner. After the sample is wetted, it can be easily slid from the first bottom mold to the foundation for pressure resistance testing. The entire operation is carried out from the same base, without the need for additional handling, which simplifies the operation steps.

[0020] (5) When one test sample is subjected to negative pressure water immersion, another test sample can be subjected to compressive strength test. The two can be carried out simultaneously without affecting each other, which has the advantage of improving operation efficiency.

[0021] (6) When the partition is rotated to be set along the upper convex rib, it can block the splashing debris generated by the compressive strength test, thereby preventing the debris from entering the water storage tank or falling into the water storage tank; when the partition is rotated to the edge of the base, it can make way for the test sample sliding from the first bottom mold to the support platform, improving the ease of operation.

[0022] (7) The electric winch, in conjunction with the partition, can pull the mold opening block out of the dovetail groove, thereby realizing convenient mold opening of the side mold, reducing manpower requirements, and improving the convenience and efficiency of operation.

[0023] (8) Since the negative pressure water immersion is carried out first and the side mold is demolded later, the adhesion between the wetted test sample and the side mold is reduced, which can improve the integrity of the test sample as much as possible during the demolding process (i.e. avoid the problem of local concrete falling off and causing pits), thereby avoiding the problem of difficulty in circumferential sealing and inaccurate compressive strength test results in the later stage. Attached Figure Description

[0024] The present application will be further explained below with reference to the accompanying drawings: Figure 1 This is a top-view cross-section diagram of the molding die structure; Figure 2 This is a front view diagram of the cross section of the molding die structure; Figure 3 This is a front view schematic diagram of the negative pressure immersion module structure; Figure 4 A front view schematic diagram of the pressing state of the first bottom mold, water tank and base; Figure 5 This is a front view schematic diagram of the pressure application module structure; Figure 6 A front view diagram showing the partition and the upper convex rib set parallel to each other. Figure 7 Top view of the partition being set perpendicular to the upper convex rib; Figure 8 This is a top view diagram showing the location of the water-retaining ribs and the structure. Figure 9 This is a front view diagram showing the location and structure of the water guide plate; Figure 10 This is a front view of the vertical section of the connection structure between the side mold, the first bottom mold, and the second bottom mold. Figure 11 A top view of the cable-stayed diaphragm configuration; Figure 12 A top view of the cross section of the mold insert location and structure; Figure 13 A cross-sectional top view of the cable being pulled out of the mold insert.

[0025] Explanation of reference numerals in the attached figures: In the picture, 1. Molding module; 11. Molding mold; 110. Casting cavity; 111. First side mold; 1111. First fin; 1112. First bolt; 112. Second side mold; 1121. Second fin; 1122. Second bolt; 113. First bottom mold; 1131. First opening; 1132. Third bolt; 114. Second bottom mold; 1141. Upper protrusion; 115. Mold opening block; 1151. Dovetail block; 1152. Insert block; 116. Pin; 2. Negative pressure immersion module; 21. Cover; 210. Water collection point; 22. Negative pressure air pump; 23. Water storage tank; 231. Drain pipe; 2311. First valve body; 24. Water supply pipe; 241. Second valve body; 25. Water storage tank; 3. Pressure application module; 31. Base; 3101. Upper protruding rib; 31011. Side protrusion; 3102. First support surface; 3103. Second support surface; 3104. Water-blocking protruding rib; 3105. Water storage tank; 3106. Water guide plate; 32. Column; 33. Top support frame; 34. First hydraulic cylinder; 341. First output shaft; 342. First pressure plate; 35. Second hydraulic cylinder; 351. Second output shaft; 352. Second pressure plate; 36. Support platform; 37. Partition plate; 38. First motor; 4. The sample to be tested; 5. Sewage tank; 6. Liquid level sensor; 7. Electric winch; 71. Cable. Detailed Implementation

[0026] Based on the above-described structural features of this application, the implementation methods of this application will be further described as follows: Reference Figure 1 , Figure 3 and Figure 4 This embodiment provides a water stability testing system for granite crushed stone asphalt concrete, including a molding module 1, a negative pressure immersion module 2, and a pressure application module 3. The molding module 1 is used to shape the mixture of granite crushed stone, asphalt, and concrete to obtain a uniformly shaped and sized test sample 4 for subsequent compressive strength testing. The negative pressure immersion module 2 is used to wet the test sample 4. The pressure application module 3 is used to test the compressive strength of the test sample 4.

[0027] Reference Figure 1 and Figure 2 The molding module 1 includes a molding die 11 for forming a casting cavity 110. The molding die 11 includes a side die composed of a first side die 111 and a second side die 112. Both the first side die 111 and the second side die 112 have an arc plate-shaped structure and can be interlocked to form a cylindrical structure to form the casting cavity 110. The first side die 111 and the second side die 112 are detachably connected (e.g., detachably connected by bolts).

[0028] Reference Figure 2 and Figure 3The molding die 11 also includes a first bottom die 113 and a second bottom die 114, both of which are straight plate structures. The first bottom die 113 and the second bottom die 114 can be fitted together to achieve pressing and sealing, thereby preventing leakage of the mixture in the casting cavity 110. The top surface of the first bottom die 113 is detachably connected to the bottom surface of the side die (i.e., the bottom surface of the first side die 111 and the bottom surface of the second side die 112) (e.g., detachably connected by bolts). The first bottom die 113 is provided with a first opening 1131 communicating with the casting cavity 110. The first opening 1131 is used to allow the water in the water storage tank 23 to directly contact the bottom surface of the sample 4 being tested.

[0029] Reference Figure 2 The second bottom mold 114 is used to seal the first opening 1131, so that the casting cavity 110 is open at the top (through which the mixture is put into the casting cavity 110) and sealed at the bottom (to prevent the mixture from leaking), thus being used for the molding process of the test sample 4.

[0030] Reference Figure 3 and Figure 4 The negative pressure immersion module 2 includes a housing 21, a negative pressure air pump 22, and a water storage tank 23. The negative pressure air pump 22 is connected to a first cavity inside the housing 21, which is sealed at the top and open at the bottom. The suction pipe of the negative pressure air pump 22 is inserted into the side wall of the housing 21 and communicates with the first cavity, so that the negative pressure air pump 22 can extract air from the first cavity, thereby creating negative pressure in the first cavity. The suction pipe is sealed to the side wall of the housing 21 (for example, by bolts and sealing rings).

[0031] Reference Figure 4 The water storage tank 23 has a second cavity, which is open at the top and sealed at the bottom. The second cavity contains water.

[0032] In traditional techniques, water is typically supplied to the top of the sample 4 under test, and negative pressure is applied to its bottom. Water, due to its own weight, tends to move downwards. Combined with the attraction of the negative pressure, this increases the rate at which water penetrates the sample 4. However, dust (usually concrete particles) often falls onto the surface of the sample 4. This dust, once inside the negative pressure pump 22, damages its internal structure. Furthermore, some water, after passing through the sample 4, mixes with the dust and enters the negative pressure pump 22, further accelerating damage and reducing its lifespan. To avoid these problems, refer to... Figure 4 and Figure 9The cover 21 can be fastened to the top surface of the molding mold 11 to apply negative air pressure to the top of the casting cavity 110; the water tank 23 can be fastened to the bottom surface of the first bottom mold 113 to supply water to the bottom of the casting cavity 110; then the dust falling from the test sample 4 will be deposited at the bottom of the second cavity and will not enter the negative pressure air pump 22, and some water will accumulate at the bottom of the first cavity after passing through the test sample 4 to form water accumulation 210, which will not enter the negative pressure air pump 22, thereby improving the service life of the negative pressure air pump 22.

[0033] The first bottom mold 113 can be selectively adapted and connected to the second bottom mold 114 or the water tank 23, respectively, for molding the test sample 4 (see reference). Figure 2 ) or soak (see Figure 4 ). Reference Figure 2 When the concrete in the test sample 4 hardens, it can adhere to and seal against the inner wall of the pouring cavity 110 (due to the expansion of the concrete) to seal the outer wall of the test sample 4 and the inner wall of the molding mold 11 during the wetting process. If the seal between the outer wall of the test sample 4 and the inner wall of the molding mold 11 is insufficient, a first gap will appear between the outer wall of the test sample 4 and the inner wall of the molding mold 11. Then, under the attraction of negative pressure, water in the second cavity will (bypass the pores inside the test sample 4) flow into the first cavity through the first gap, resulting in a poor wetting effect inside the test sample 4.

[0034] Reference Figure 2 , Figure 3 and Figure 4 After the test sample 4 is wetted, the demolding force required to remove the molding mold 11 is reduced (that is, the adhesion force between the outer wall of the test sample 4 and the inner wall of the molding mold 11 is reduced). On the one hand, the demolding force required is reduced, which improves the convenience of construction. On the other hand, it reduces the amount of demolding agent required, reduces material loss, and lowers costs.

[0035] Reference Figure 3 and Figure 9 If the suction pipe is inserted into the top of the side wall of the cover 21, the suction pipe can be positioned as high as possible, and the water accumulation 210 can have the greatest possible thickness, thus increasing the maximum capacity of the first cavity for the water accumulation 210.

[0036] Reference Figure 2 The top surface of the second bottom mold 114 is provided with an upper protrusion 1141 (for example, by bolt fixing or by integral fixing); when the first bottom mold 113 is connected to the second bottom mold 114, the upper protrusion 1141 is adapted to be inserted into the first hole 1131, and the top surface of the upper protrusion 1141 is coplanar with the top surface of the first bottom mold 113 (to make the bottom surface of the sample 4 to be planar).

[0037] Reference Figure 3 , Figure 4 and Figure 9 The negative pressure immersion module 2 also includes a water supply pipe 24 and a water storage tank 25 for supplying water to the water storage tank 23; one end of the water supply pipe 24 is connected to and communicates with the water storage tank 25, and the other end is connected to and communicates with the water storage tank 23. A drain pipe 231 is installed at the bottom of the side wall of the water storage tank 23. One end of the drain pipe 231 communicates with the second cavity, and the other end points to the sewage tank 5 located next to the base 31. A first valve body 2311 is installed on the drain pipe 231; a second valve body 241 is provided at the end of the water supply pipe 24 near the water storage tank 23. When the user closes the second valve body 241 and opens the first valve body 2311, the water and dust in the second cavity can flow into the sewage tank 5 through the drain pipe 231, thereby cleaning the dust (when the dust content in the water in the second cavity is too high, it will block the gaps of the test sample 4, resulting in increased difficulty in wetting the test sample 4 and reduced wetting efficiency).

[0038] Reference Figure 5 The pressure module 3 includes a base 31, with a first pressure plate 342 and a second pressure plate 352 positioned above the base 31. The top surface of the cover 21 is fixedly mounted on the bottom surface of the first pressure plate 342 (e.g., by bolts). A water tank 23 is disposed within the base 31 and below the first pressure plate 342. The water tank 23 is inserted into a receiving cavity on the top surface of the base 31, and its outer wall is sealed and fixedly connected to the inner wall of the receiving cavity (e.g., by bolts and sealing rings), thus preventing water / air leakage between the outer wall of the water tank 23 and the inner wall of the receiving cavity. The first pressure plate 342 and the second pressure plate 352 can move independently up and down.

[0039] Reference Figure 5 The first pressure plate 342 can press down on the cover 21, so that the bottom surface of the cover 21 is pressed and sealed with the top surface of the side mold, and the bottom surface of the first bottom mold 113 is pressed and sealed with the top surface of the water storage tank 23, so that the first cavity, the casting cavity 110 and the second cavity can form a sealed cavity for generating negative pressure and wetting the test sample 4.

[0040] Reference Figure 5 The second pressure plate 352 can press down on the test sample 4 (until the test sample 4 is overloaded and damaged) to test the compressive strength of the test sample 4 (the test sample 4 includes a wetted test sample 4 and an unwetted test sample 4).

[0041] Reference Figure 5The pressure application module 3 also includes columns 32, a top support frame 33, a first hydraulic cylinder 34, and a second hydraulic cylinder 35. The top support frame 33 has a rectangular frame structure. Four columns 32 are provided and are located below the four right angles of the top support frame 33. The top of the column 32 is vertically fixed to the top support frame 33 (e.g., by bolts) and the bottom is vertically fixed to the base 31 (e.g., by bolts), thereby achieving stable support for the top support frame 33. The base 31 and the top support frame 33 are both horizontally arranged; the first hydraulic cylinder 34 and the second hydraulic cylinder 35 are both vertically arranged. The outer shell of the first hydraulic cylinder 34 is vertically fixed to the top support frame 33 (e.g., by bolts), and the first output shaft 341 of the first hydraulic cylinder 34 is vertically fixed to the first pressure plate 342 (e.g., by bolts). The first hydraulic cylinder 34 can drive the first pressure plate 342 to move vertically and apply downward pressure to the cover 21. The housing of the second hydraulic cylinder 35 is vertically fixedly connected to the top support frame 33 (e.g., by bolts), and the second output shaft 351 of the second hydraulic cylinder 35 is vertically fixedly connected to the second pressure plate 352 (e.g., by bolts). The second hydraulic cylinder 35 can drive the second pressure plate 352 to move vertically and apply downward pressure to the sample 4 being tested.

[0042] The first hydraulic cylinder 34 is connected to and communicates with the first oil pump via a first oil supply pipe. The first oil pump is connected to and communicates with the first oil tank via a second oil supply pipe. The first oil pump is used to drive the extension and retraction of the first output shaft 341 of the first hydraulic cylinder 34. The second hydraulic cylinder 35 is connected to and communicates with the second oil pump via a third oil supply pipe. The second oil pump is connected to and communicates with the second oil tank via a fourth oil supply pipe. The second oil pump is used to drive the extension and retraction of the second output shaft 351 of the second hydraulic cylinder 35. The first oil pump, the first oil tank, the second oil pump, and the second oil tank are all placed on the floor of the processing workshop.

[0043] Both the first pressure plate 342 and the second pressure plate 352 are set horizontally.

[0044] Reference Figure 6 and Figure 7 The base 31 has an upper rib 3101, a first support surface 3102, and a second support surface 3103 on its top surface. The first support surface 3102 and the second support surface 3103 are respectively located on both sides of the upper rib 3101. The second support surface 3103 has a support platform 36 for supporting the test sample 4 upward (the support platform 36 is fixedly connected to the second support surface 3103 by bolts). The support platform 36 is located below the second pressure plate 352. When the bottom surface of the first bottom mold 113 is pressed onto the first support surface 3102, the top surface of the first bottom mold 113, the top surface of the upper rib 3101, and the top surface of the support platform 36 are coplanar. The wetted test sample 4 can be easily slid from the top surface of the first bottom mold 113 to the top surface of the support platform 36, thereby improving the convenience and efficiency of the operation.

[0045] The upward convex rib 3101 is fixedly connected to the base 31 (for example, fixedly connected by bolts or integrally). Refer to Figure 6 and Figure 7 , the base 31 has a cuboid structure, the upward convex rib 3101 and the base 31 are arranged in a shape like the Chinese character 'Ri', and the length direction of the upward convex rib 3101 is arranged along the width direction of the base 31.

[0046] Refer to Figure 5 、 Figure 6 、 Figure 7 and Figure 8 , a vertically arranged partition 37 is provided above the base 31. One side edge of the partition 37 is perpendicularly arranged and rotatably connected to the top end face of the upward convex rib 3101 (for example, rotatably connected through a vertically arranged first rotating shaft); the partition 37 can rotate; when the partition 37 is arranged parallel to the upward convex rib 3101 (refer to <00001十七1>, the length direction of the partition 37 is arranged along the length direction of the upward convex rib 3101), it is used to prevent debris generated when the measured sample 4 is crushed under pressure from splashing into the water storage tank 23; when the partition 37 is arranged perpendicular to the upward convex rib 3101 (refer to Figure 7 , the length direction of the partition 37 is arranged along the length direction of the base 31), it is used to make way for the measured sample 4 sliding from the first bottom mold 113 to the bearing platform 36.

[0047] Refer to Figure 5 and Figure 6 , the pressing module 3 further includes a vertically arranged first motor 38. The outer shell of the first motor 38 is fixedly connected to the top support frame 33 (for example, fixedly connected by bolts), the output shaft of the first motor 38 is coaxially and fixedly connected to the top end of the first rotating shaft (for example, fixedly connected by bolts and keys for torque transmission), and the bottom end of the first rotating shaft is rotatably connected to the upward convex rib 3101 through a bearing and a bearing seat. The first motor 38 can drive the partition 37 to rotate.

[0048] Refer to Figure 8 and Figure 9 , a water retaining convex rib 3104 in a C shape is provided on the outer edge of the upper surface of the first support surface 3102 (for example, hermetically fixed by bolts and sealing strips), and both ends of the water retaining convex rib 3104 are respectively connected and sealed to the two ends of the upward convex rib 3101 to form a water storage tank 3105 (for example, sealed by sealant); when the side mold is disengaged from the cover 21, the accumulated water 210 originally stored in the first cavity flows downward along the outer surface of the side mold and enters the water storage tank 3105. The water storage tank 3105 is used to temporarily store the accumulated water 210 and avoid the problem of the accumulated water 210 flowing randomly on the base 31. <00001十八1><温

[0049] Refer to Figure 8 and<00001八十四>The back of the C-shaped water-blocking rib 3104 has a notch, and a water guide plate 3106 is fixedly installed inside the notch. The water guide plate 3106 is a plate structure with a U-shaped cross-section. The outer bottom surface of the water guide plate 3106 is sealed and fixedly connected to the first support surface 3102 (for example, by bolts and sealing strips). The outer side surface of the water guide plate 3106 is sealed and fixedly connected to the water-blocking rib 3104 (for example, by bolts and sealing strips). The end of the water guide plate 3106 away from the base 31 is angled downward and points towards the sewage tank 5, so the water 210 in the water storage tank 3105 can flow into the sewage tank 5 through the water guide plate 3106. After the water 210 in the water storage tank 3105 has completely flowed into the sewage tank 5, the sample 4 to be tested is moved from the first bottom mold 113 to the support platform 36 (although the pressure of the first pressure plate 342 is removed, the weight of the sample 4 to be tested will press against the first bottom mold 113, so that the first bottom mold 113 and the first support surface 3102 are pressed together and sealed, so the water 210 in the water storage tank 3105 will not flow into the water storage tank 23).

[0050] Reference Figure 5 and Figure 6 The top surface of the water storage tank 23 is coplanar with the first support surface 3102, so that the bottom surface of the first bottom mold 113 can be adapted to press onto the top surface of the water storage tank 23 and the first support surface 3102 for sealing.

[0051] Reference Figure 10 The first side mold 111 has a first fin 1111 at the bottom of its outer wall (e.g., fixed by welding or integral connection), and the inner edge of the first fin 1111 fits and conforms to the outer wall of the first side mold 111. The second side mold 112 has a second fin 1121 at the bottom of its outer wall (e.g., fixed by welding or integral connection), and the inner edge of the second fin 1121 fits and conforms to the outer wall of the second side mold 112. The bottom surface of the first fin 1111 is coplanar with the bottom surface of the first side mold 111; the bottom surface of the second fin 1121 is coplanar with the bottom surface of the second side mold 112. The first fin 1111 is detachably connected to the first bottom mold 113 by a first bolt 1112, the second fin 1121 is detachably connected to the first bottom mold 113 by a second bolt 1122, and the first bottom mold 113 and the second bottom mold 114 are detachably connected by a third bolt 1132.

[0052] Reference Figure 9 and Figure 10The upper surface of the first fin 1111 is provided with a first countersunk hole adapted to the first bolt 1112, the upper surface of the second fin 1121 is provided with a second countersunk hole adapted to the second bolt 1122, and the upper surface of the first bottom mold 113 is provided with a third countersunk hole adapted to the third bolt 1132. When the cover 21 is separated from the side mold, the accumulated water 210 flows downward along the outer wall of the side mold; and some of the dust contained in the accumulated water 210 may enter the first countersunk hole / second countersunk hole / third countersunk hole, causing the first bolt 1112 / second bolt 1122 / third bolt 1132 to jam; therefore, before the cover 21 is separated from the side mold, several rubber plugs need to be used to seal the first countersunk hole / second countersunk hole / third countersunk hole to prevent dust from entering the first countersunk hole / second countersunk hole / third countersunk hole.

[0053] Reference Figure 2 and Figure 3 The first opening 1131 has a circular structure and its diameter is smaller than that of the casting cavity 110. Therefore, the diameter of the first opening 1131 is smaller than that of the sample 4 to be tested. So, during the process of moving the side mold, the first bottom mold 113 and the sample 4 to be tested together onto the base 31, the sample 4 to be tested will not fall out through the first opening 1131, but will always remain inside the casting cavity 110.

[0054] Reference Figure 9 The bottom surface of the first side mold 111 is provided with a first sealing layer (for example, using an elastic material such as rubber, and fixedly connected to the first side mold 111 by bolts), and the bottom surface of the second side mold 112 is provided with a second sealing layer (for example, using an elastic material such as rubber, and fixedly connected to the second side mold 112 by bolts). When the bottom surface of the first side mold 111 / the bottom surface of the second side mold 112 is pressed against the top surface of the first bottom mold 113, a seal can be achieved. Therefore, there is no need to set a sealing layer on the top surface of the first bottom mold 113, so that the sample 4 under test can have the smallest possible frictional resistance when sliding on the top surface of the first bottom mold 113 (if a sealing layer is set on the top surface of the first bottom mold 113, there will be a large resistance).

[0055] Reference Figure 9 The lower surface of the first bottom mold 113 is provided with a third sealing layer (for example, using elastic materials such as rubber, which is fixedly connected to the first bottom mold 113 by bolts). When the first bottom mold 113 is in contact with the top surface of the second bottom mold 114 / the top surface of the water tank 23 / the first support surface 3102, a seal can be achieved, which has the technical effect of reducing material usage (setting sealing layers on the top surface of the second bottom mold 114, the top surface of the water tank 23, and the first support surface 3102 respectively would require more rubber material, resulting in higher costs).

[0056] Reference Figure 9The bottom surface of the cover 21 is provided with a fourth sealing layer (for example, using elastic materials such as rubber, which is fixedly connected to the cover 21 by bolts), and the sealing effect is achieved when the bottom surface of the cover 21 is pressed against the top surface of the side mold.

[0057] The outer casing of the negative pressure air pump 22 is fixedly installed on the outer wall of the cover 21 or on the floor of the workshop by bolts.

[0058] A first pressure sensor is installed at the connection position between the first output shaft 341 and the first pressure plate 342. When the pressure signal detected by the first pressure sensor is not lower than the built-in pressure standard value, it is determined that the first cavity, the casting cavity 110, and the second cavity have completed pressure sealing, and the first output shaft 341 stops extending further. The pressure standard value can be obtained through a limited number of experiments, and will not be described in detail here. A second pressure sensor is installed at the connection position between the second output shaft 351 and the second pressure plate 352, which is used to detect the pressure of the second pressure plate 352 on the test sample 4 in real time, and thus to detect the compressive strength of the test sample 4.

[0059] The invention also includes an electrical cabinet, which is fixedly installed on the workshop floor by bolts; the negative pressure air pump 22, the first hydraulic cylinder 34, the second hydraulic cylinder 35, the first oil pump, the second oil pump, the liquid level sensor 6, the camera, the supplementary light, the electric winch 7, the first pressure sensor, and the second pressure sensor are respectively connected to the electrical cabinet via wires and signal lines; the electrical cabinet is connected to the external power supply and the external controller (e.g., a computer or a PLC programmable logic controller) via wires and signal lines, and the external controller controls the start and stop of the negative pressure air pump 22, the first hydraulic cylinder 34, the second hydraulic cylinder 35, the first oil pump, the second oil pump, the liquid level sensor 6, the camera, the supplementary light, the electric winch 7, the first pressure sensor, and the second pressure sensor through the electrical cabinet.

[0060] Reference Figure 9The cover 21 contains a vertically mounted liquid level sensor 6, the top of which is fixedly connected to the cover 21 by bolts. The liquid level sensor 6 is used to collect the liquid level information of the accumulated water 210 and display it in real time on an external display (the external display is set on the workbench in the processing workshop). The height of the water tank 25 is higher than that of the top support bracket (for example, the water tank 25 is hung on the wall with bolts), and the height of the column 32 is higher than that of the molding mold 11. Therefore, when the side mold, the first bottom mold 113 and the test sample 4 are pressed onto the first support surface 3102, the height of the first cavity, the second cavity and the casting cavity 110 are all lower than that of the water tank 25. At this time, the first valve body 2311 is closed and the second valve body 241 is opened. The water supply pipe 24 and the water in the water tank 25 will flow through the second cavity, the first opening 1131, the casting cavity 110 and enter the first cavity in sequence (at this time, the negative pressure air pump 22 is working and continuously extracts the air in the first cavity).

[0061] Reference Figure 3 and Figure 9 The height of the first cavity is 10 cm. During operation, the operator closes the first valve 2311, opens the second valve 241 and the negative pressure air pump 22. When the thickness (i.e., depth) of the accumulated water 210 exceeds 3 cm, the second valve 241 is closed. The negative pressure air pump 22 can reduce the air pressure in the first cavity and the casting cavity 110. Then, the residual air bubbles inside the test sample 4 (some air bubbles have been squeezed out when the water flows from bottom to top through the test sample 4, so this is a residual air bubble) will rise and burst, allowing water to seep into the interior of the test sample 4.

[0062] The image information captured by the camera is displayed in real time on an external monitor for user observation. After the second valve 241 is closed, as the air pressure decreases, when the user observes (within 5 consecutive minutes) that no air bubbles overflow from the sample 4 being tested, it is determined that the sample 4 is completely wetted. At this time, the negative pressure air pump 22 needs to be turned off, and the first valve 2311 / second valve 241 needs to be turned on to allow outside air / water to flow into the second chamber. Then the air pressure in the first chamber will return to normal pressure (after which the first valve 2311 / second valve 241 will be turned off) to avoid the problem of negative pressure between the cover 21 and the molding mold 11 making it difficult to separate.

[0063] The first valve body 2311 and the second valve body 241 are manual valves, which are manually controlled by the user.

[0064] Reference Figure 7An electric winch 7 is fixedly installed on the side wall of the base 31 away from the first support surface 3102 (by bolts). The end of the cable 71 of the electric winch 7 is provided with a loop (for example, connected by a knot). The user puts the loop on the sample 4 to be tested, and then starts the electric winch 7, which can pull the sample 4 to be tested from the first bottom mold 113 to the support platform 36.

[0065] Reference Figure 11 An electric winch 7 is fixedly mounted on the side wall of the base 31 away from the first support surface 3102 (by bolts). The end of the cable 71 of the electric winch 7 is provided with a hook (e.g., connected by a knot). The hook can be detachably connected to the side edge of the partition 37 away from the first motor 38 (by hanging). This is used for the partition 37 and the cable to drive the test sample 4 to move laterally, avoiding the problem that the first motor 38 is easily burned out when the partition 37 is used as a force-intensive lever structure to push the test sample 4. When the hook is hung and connected to the side edge of the partition 37 away from the first motor 38, the electric winch 7 and the cable 71 can be used to apply a pulling force to the side edge of the partition 37 away from the first motor 38 (in conjunction with the torque applied by the first motor 38 to the partition 37) to push the test sample 4 from the first bottom mold 113 to the support platform 36. This avoids the time-consuming and laborious problem of manually pushing the test sample 4 laterally. (Driven by the first motor 38), the partition plate 37 first rotates to the side of the test sample 4 away from the second support surface 3103 (located above the first bottom mold 113). Then, the operator hangs the hook on the side edge of the partition plate 37 and pushes the test sample 4 to move laterally. Then, (under the combined action of the first motor 38 and the electric winch 7), the test sample 4 slides from the first bottom mold 113 onto the support platform 36 (during which the test sample 4 is guided by human assistance). After that, the operator removes the hook from the partition plate 37, and the partition plate 37 rotates in the opposite direction to be parallel to the upper convex rib 3101.

[0066] Reference Figure 12 The side mold also includes a mold opening insert 115, which includes an insert 1152 and a dovetail block 1151 fixedly disposed at the end of the insert 1152 (e.g., by an integral fixed connection or by bolts). A dovetail groove is provided at the connection position of the first side mold 111 and the second side mold 112. The dovetail block 1151 can be fitted into the dovetail groove, and the insert 1152 is disposed outside the dovetail groove; the open end of the dovetail groove points to the outside of the side mold. The mold opening insert 115 is arranged radially along the side mold. When the connecting bolts between the first side mold 111 and the second side mold 112 are removed, the mold opening insert 115 is pulled out from the dovetail groove, which can apply an expansion force to the connection position of the first side mold 111 and the second side mold 112, thereby realizing the mold opening of the first side mold 111 and the second side mold 112. The end of the insert block 1152 away from the dovetail block 1151 is provided with a hook-connecting through hole, and the hook can be inserted into the hook-connecting through hole to achieve connection with the insert block 1152.

[0067] Reference Figure 12 and Figure 13 When the side mold is placed on the base 31, the mold opening block 115 and the upper convex rib 3101 are arranged vertically in a T-shape. The upper surface of the upper convex rib 3101 is provided with a vertical insertion hole at the end away from the first motor 38. The pin 116 can be vertically inserted into the vertical insertion hole (to abut against the partition 37) so that when the mold opening block 115 is pulled out, the partition 37 can apply a counter-pushing force to the first side mold 111 and the second side mold 112. The pin 116 can be pulled out and removed from the vertical insertion hole to prevent the partition 37 from being jammed when rotation is required. The partition 37 is provided with a horizontal insertion hole. The partition can be rotated to press against the outer wall of the side mold (near the second support surface 3103), and the middle part of the mold opening block 115 is inserted into the horizontal insertion hole. (Then the operator inserts the pin 116 vertically into the vertical insertion hole, with the top protruding from the top of the vertical insertion hole to laterally abut against the partition 37. Then the operator hooks the hook to the insertion block 1152. Then the electric winch 7 can be started to apply tension to the cable 71.) The mold opening block 115 can be pulled out from the dovetail groove by using the cable and hook to realize the (mechanized) mold opening of the side mold, thereby reducing the need for manpower and achieving the effect of saving time and effort.

[0068] After the side mold is opened using the electric winch 7 and the partition plate 37, if one of the first side mold 111 and the second side mold is still attached to the outer surface of the sample 4 and has not been separated, it is necessary to manually pry it open (for example, using a flat-headed pry bar).

[0069] The first motor 38 is a controllable motor (such as a servo motor or a stepper motor). The controllable motor is controlled by an external controller that inputs electrical signals to it, which can control the motor's speed, number of revolutions per rotation, angle of revolutions per rotation, and start / stop timing.

[0070] Negative pressure air pump 22 is a vacuum pump.

[0071] Reference Figure 7 The upper rib 3101 has two side protrusions 31011 (e.g., connected by an integral fixed connection) near the side wall of the first support surface 3102. A first slot is provided between the two side protrusions 31011. The first bottom mold 113 can be partially adapted and engaged into the first slot, thereby preventing jamming when the sample 4 is slid to the joint between the first bottom mold 113 and the upper rib 3101.

[0072] The outer surface of the base 31 is made of stainless steel, which has excellent wear resistance and rust prevention.

[0073] A method for testing the water stability of granite crushed stone asphalt concrete, wherein the granite crushed stone asphalt concrete water stability testing system is used to conduct a water stability test on the tested sample 4, the steps of which include: S1. Assemble two molding molds 11. Spray a release agent onto the inner surface of the casting cavity 110 of one molding mold 11 (the release agent is a conventional existing technology, and will not be described in detail). Do not spray the release agent onto the inner surface of the casting cavity 110 of the other molding mold 11.

[0074] S2. Pour the mixture into the two pouring cavities 110; the mixture includes granite crushed stone, asphalt and concrete, which are obtained by pre-mixing.

[0075] S3. The mixture in the two casting cavities 110 hardens to obtain two test samples 4.

[0076] S4. Open the mold 11 with the release agent sprayed on (i.e., remove the first side mold 111, the second side mold 112, the first bottom mold 113 and the second bottom mold 114) to obtain the unwetted test sample 4.

[0077] S5. After removing the second bottom mold 114 from the molding mold 11 without the release agent, place it on the first support surface 3102 to wet the test sample 4; at the same time, place the unwetted test sample 4 on the support platform 36 to test the compressive strength.

[0078] S6. Remove the first side mold 111 and the second side mold 112 from the outer periphery of the wetted test sample 4, and then slide the wetted test sample 4 from the first bottom mold 113 onto the bearing platform 36 for compressive strength testing.

[0079] S7. Calculate the water stability coefficient; Water stability coefficient = (compressive strength of wetted test sample 4) / (compressive strength of unwetted test sample 4).

[0080] Reference Figure 4 The casting cavity 110 has a frustum-shaped structure, and the diameter of the top opening is smaller than the diameter of the bottom opening, in order to prevent the test sample 4 (due to pressure) from falling out of the casting cavity 110.

[0081] In this invention, demolding of the circumferential surface of the test sample 4 is no longer performed in the early stage. Instead, the sealing state between the test sample 4 and the side mold is maintained until the negative pressure water immersion process. On the one hand, there is no need to rebuild the sealing structure for the circumferential surface of the test sample 4, which reduces the operation steps and improves the operation efficiency. On the other hand, the adhesion between the test sample 4 and the side mold is reduced after wetting, which reduces the difficulty of mold opening. On the third hand, the amount of release agent used is reduced.

[0082] Traditional techniques involve demolding followed by negative pressure water immersion. However, during demolding, localized concrete detachment from the circumference of the test sample 4 can easily occur, forming irregular pits. This leads to significant deviations in subsequent compressive strength measurements (a marked decrease in compressive strength) and makes subsequent sealing difficult (the pits can trap part of the sealing ring / layer, causing elastic bonding failure, resulting in seal failure and leakage). In this invention, negative pressure water immersion is performed first, followed by demolding from the side mold. The reduced adhesion between the wetted test sample 4 and the side mold maximizes the integrity of the test sample 4 during demolding (preventing localized concrete detachment and pit formation), avoiding inaccurate compressive strength results and the difficulty in achieving circumferential sealing.

[0083] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0084] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] In conclusion, for those skilled in the art, any changes, modifications, substitutions, or variations made to this invention based on the guidance of this invention, without departing from the principles and spirit of this invention, still fall within the protection scope of this invention.

Claims

1. A system for water stability testing of a granite macadam asphalt concrete, characterized by: The system includes a molding module (1), a negative pressure immersion module (2), and a pressure application module (3). The molding module (1) includes a molding mold (11) for forming a casting cavity (110). The molding mold (11) includes a side mold composed of a first side mold (111) and a second side mold (112). The molding mold (11) also includes a first bottom mold (113) and a second bottom mold (114). The first side mold (111) and the second side mold (112) are detachably connected. The top surface of the first bottom mold (113) is detachably connected to the bottom surface of the side mold. The first bottom mold (113) is provided with a first opening (1131) communicating with the casting cavity (110). The second bottom mold (114) is used to seal the first opening (1131). The negative pressure immersion module (2) includes a cover (21), a negative pressure air pump (22), and a water storage tank (23); the negative pressure air pump (22) is connected to a first cavity inside the cover (21), and the water storage tank (23) has a second cavity containing water; the cover (21) can be fastened to the top surface of the molding mold (11) to apply negative air pressure to the top of the casting cavity (110); the water storage tank (23) can be fastened to the bottom surface of the first bottom mold (113) to apply negative air pressure to the bottom of the casting cavity (110). Water is supplied from the end; the first bottom mold (113) can be selectively adapted and connected to the second bottom mold (114) or the water storage tank (23) for molding or wetting the test sample (4), respectively; when the concrete in the test sample (4) hardens, it can fit against the inner wall of the pouring cavity (110) for sealing between the outer wall of the test sample (4) and the inner wall of the molding mold (11) during the wetting process; after the test sample (4) is wetted, the demolding force required to remove the molding mold (11) can be reduced; The second bottom mold (114) has an upper protrusion (1141) on its top surface; when the first bottom mold (113) is connected to the second bottom mold (114), the upper protrusion (1141) is adapted to be inserted into the first opening (1131), and the top surface of the upper protrusion (1141) is coplanar with the top surface of the first bottom mold (113); The pressure module (3) includes a base (31), and a first pressure plate (342) and a second pressure plate (352) are provided above the base (31); the cover (21) is fixedly installed on the bottom surface of the first pressure plate (342); the water tank (23) is disposed inside the base (31) and located below the first pressure plate (342); the first pressure plate (342) can press down on the cover (21), so that the bottom surface of the cover (21) is pressed and sealed with the top surface of the side mold, and the bottom surface of the first bottom mold (113) is pressed and sealed with the top surface of the water tank (23), for wetting the sample (4) being tested; The top surface of the base (31) is provided with an upper rib (3101), a first support surface (3102) and a second support surface (3103). The first support surface (3102) and the second support surface (3103) are respectively located on both sides of the upper rib (3101). The second support surface (3103) is provided with a support platform (36) for supporting the test sample (4) upward. The support platform (36) is located below the second pressure plate (352). When the bottom surface of the first bottom mold (113) is pressed onto the first support surface (3102), the top surface of the first bottom mold (113), the top surface of the upper rib (3101) and the top surface of the support platform (36) are coplanar, and the test sample (4) after being wetted can slide from the top surface of the first bottom mold (113) to the top surface of the support platform (36).

2. The system for water stability testing of granite chip asphalt concrete according to claim 1, characterized in that: The negative pressure immersion module (2) also includes a water supply pipe (24) and a water storage tank (25) for supplying water to the water storage tank (23); one end of the water supply pipe (24) is connected to the water storage tank (25) and the other end is connected to the water storage tank (23).

3. The system for water stability testing of granite chip asphalt concrete according to claim 2, characterized in that: A drain pipe (231) is installed at the bottom of the side wall of the water storage tank (23), and a first valve body (2311) is installed on the drain pipe (231); a second valve body (241) is provided at the end of the water supply pipe (24) near the end of the water storage tank (23).

4. The system for water stability testing of granite chip asphalt concrete according to claim 3, characterized in that: The second pressure plate (352) can press down on the test sample (4) to test the compressive strength of the test sample (4).

5. The system for water stability testing of granite chip asphalt concrete according to claim 4, characterized in that: The base (31) is provided with a vertical partition (37) above it. One edge of the partition (37) is perpendicular to the top surface of the upper convex rib (3101) and rotatably connected. The partition (37) is rotatable; when the partition (37) is arranged parallel to the upper convex rib (3101), it is used to prevent the debris generated when the test sample (4) is crushed by pressure from splashing into the water storage tank (23); when the partition (37) is arranged perpendicular to the upper convex rib (3101), it is used to make way for the test sample (4) sliding from the first bottom mold (113) onto the support platform (36).

6. The system for water stability testing of granite chip asphalt concrete according to claim 5, characterized in that: The outer edge of the upper surface of the first support surface (3102) is provided with a C-shaped water-blocking rib (3104), and the two ends of the water-blocking rib (3104) are respectively connected to the two ends of the upper rib (3101) to form a water storage tank (3105). When the side mold is separated from the cover (21), the water (210) originally stored in the first cavity flows down along the outer surface of the side mold and enters the water storage tank (3105).

7. A method of water stability testing of a granite macadam asphalt concrete, characterized by, The water stability test of the sample (4) was conducted using the granite crushed stone asphalt concrete water stability test system described in claim 6, and the steps included: S1. Assemble two molding molds (11), spray a release agent onto the inner surface of the casting cavity (110) of one of the molding molds (11), and do not spray a release agent onto the inner surface of the casting cavity (110) of the other molding mold (11). S2. Pour a mixture into the two casting cavities (110); the mixture comprises granite crushed stone, asphalt and concrete; S3. The mixture is hardened to obtain two test samples (4). S4. The molding mold (11) with the release agent sprayed on it is opened to obtain the unwetted test sample (4). S5. After removing the second bottom mold (114) from the molding mold (11) without the release agent, place it on the first support surface (3102) to wet the test sample (4); at the same time, place the unwetted test sample (4) on the support platform (36) to test the compressive strength. S6. Remove the first side mold (111) and the second side mold (112) on the outer periphery of the wetted test sample (4), and then slide the wetted test sample (4) from the first bottom mold (113) onto the support (36) and perform compressive strength testing. S7. Calculate the water stability coefficient.

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