Mold and method for preparing rock-concrete combination sample

Abstract

The invention relates to a preparation mold and method of a rock-concrete combination sample, and belongs to the technical field of sample manufacturing, the preparation mold comprises two same mold units, which are respectively marked as a unit A and a unit B; an empty groove is formed in the sample mold, the empty groove is cylindrical, and the axis of the empty groove is arranged in the vertical direction; the two shroud rings are used for always splicing the unit A and the unit B into a complete sample mold; the grouting opening is formed in the upper end of the sample mold; one end of the grouting pipe is installed at the grouting opening, and the other end of the grouting pipe is located in concrete grout; a grouting pump; the grouting valve is used for controlling opening and closing of the grouting pipe; the slurry outlet is used for being communicated with the empty groove; one end of the slurry outlet pipe is mounted at the slurry outlet; the pulp outlet valve is used for controlling opening and closing of the pulp outlet pipe; and a clamping ring is mounted on the table surface of the vibration table, is matched with the sample mold and is used for limiting the sample mold on a screw on the vibration table. The mold and the method can be used for manufacturing the rock-concrete combination sample, and the sample is provided for subsequent tests.

Description

Technical Field

[0001] The invention belongs to the technical field of sample preparation, and in particular relates to a preparation mold and method for a rock-concrete combination sample. Background Art

[0002] Some large infrastructures in hydraulic engineering and civil engineering, such as dams and tunnels, are based on natural geological bodies and are built on top of geological bodies. They are a combination of geological bodies and engineering bodies. When these combined bodies bear external loads, they jointly maintain overall stability.

[0003] The mechanical properties of the contact surface of a combination are not only related to the mechanical properties of a single body, but are more the result of the common force, coordinated deformation and common destruction of the entire combination.

[0004] At present, there is no mold or method that can prepare rock-concrete composite samples, let alone make the contact surface between rock and concrete present different angles. Therefore, it is difficult to conduct effective and rapid research in related technical fields on the above composite. Summary of the invention

[0005] The present invention provides a rock-concrete composite sample preparation mold and method, which are used to solve the above-mentioned defects.

[0006] A preparation mold for a rock-concrete composite sample of the present invention comprises: Two identical mold units are respectively denoted as unit A and unit B, and unit A and unit B can be assembled into a complete sample mold; a hollow groove is provided inside the sample mold, and the hollow groove is cylindrical in shape, and the axis of the hollow groove is arranged vertically; the joint surface of unit A and unit B is arranged vertically, and the hollow groove is equally divided into two parts; Two hoops are respectively mounted on the upper and lower outer walls of the sample mold to ensure that unit A and unit B are always assembled into a complete sample mold; A grouting port is provided at the upper end of the sample mold and is used to communicate with the empty slot; A grouting pipe, one end of which is installed at the grouting port through a first fixing buckle and communicated with the empty groove, and the other end of which is in the concrete slurry; A grouting pump, installed on the grouting pipe, used to inject concrete slurry into the empty groove through the grouting pipe; Grouting valve, installed on the grouting pipe, used to control the opening and closing of the grouting pipe; A slurry outlet is provided at the upper end of the sample mold and is used to communicate with the empty slot; A slurry outlet pipe, one end of which is installed at the slurry outlet through a second fixing buckle and communicated with the empty slot, and the other end of which is outside the sample mold; The slurry discharge valve is installed on the slurry discharge pipe to control the opening and closing of the slurry discharge pipe; A vibrating table, on which a snap ring is installed. The snap ring is adapted to the lower end of the specimen mold, the snap ring is sleeved on the lower end of the specimen mold, and a screw for restricting the specimen mold on the vibrating table is threadedly connected to the snap ring.

[0007] This mold can pour concrete on the basis of the core to produce a combined specimen of rock-concrete, and can make suitable specimens for subsequent stress tests and triaxial tests.

[0008] Furthermore, the materials of unit A and unit B are organic glass materials.

[0009] It can help the user directly observe the pouring situation in the internal empty groove through the glass, and avoid the occurrence of voids during the pouring process.

[0010] Furthermore, the grouting pipe can be disassembled from the specimen mold through the first fixing buckle; the slurry outlet pipe can be disassembled from the specimen mold through the second fixing buckle.

[0011] There are two advantages to being able to disassemble: one is that rubber plugs can be installed at the grouting port and the slurry outlet to prevent water loss during later maintenance. The other is that a syringe can be used to inject concrete slurry into the empty groove to fill the voids.

[0012] A preparation method for a combined specimen of rock-concrete includes the following steps: S1: Select a complete and defect-free rock block, drill the core of the rock block, and process the core to prepare a cylindrical rock standard specimen that meets the requirements; the diameter of the rock standard specimen is equal to the diameter of the empty groove; the meaning of complete and defect-free is that there are no fissure faults inside the rock block; S2: Cut the rock standard specimen along the side wall of the rock standard specimen into two semi-rock specimens; the cut surface of the rock standard specimen is a plane; let the angle between the cut surface and the horizontal plane be X, then 0 < X < 90 degrees; along the side wall of the rock standard specimen means that the starting point and the ending point of the cut surface are both located on the side wall of the rock standard specimen; S3: Uniformly coat the inner wall of the empty groove with a release agent to ensure smooth demolding; place one of the semi-rock specimens into the empty groove, ensuring that the cut surface of the semi-rock specimen is at the upper end of the semi-rock specimen; Unit A and unit B form a specimen mold using a hoop to ensure that the specimen mold does not come loose and the concrete slurry does not flow out; S4: Respectively use the first fixing buckle and the second fixing buckle to connect the specimen mold containing the semi-rock specimen to the grouting pipe and the slurry outlet pipe respectively, and wait for the concrete slurry to be poured; S5: Prepare the concrete slurry as required; S6: Open the grouting valve, the slurry outlet valve and the grouting pump in sequence, and observe the end of the slurry outlet pipe away from the sample mold. If concrete slurry flows out of the end of the slurry outlet pipe, close the grouting pump, the slurry outlet valve and the grouting valve in sequence; S7: Turn on the vibration table for a vibration time of T; observe whether the area in the empty slot except the half of the rock sample is filled with concrete; if there is a gap, remove the grouting pipe at the first fixing buckle or the slurry outlet pipe at the second fixing buckle, and use a syringe to extend into the empty slot through the grouting port or the slurry outlet, and use the syringe to fill the gap with concrete slurry; then, turn on the vibration table again for a time of T until there is no gap in the area in the empty slot except the half of the rock sample; S8: Remove the sample mold containing the rock-concrete assembly from the vibration table; remove the grouting pipe and the grouting pipe from the first fixing buckle and the second fixing buckle respectively; seal the grouting port and the grouting port with rubber plugs to prevent water loss during the initial setting process of the concrete sample; S9: 24 hours after the rock-concrete assembly is poured, the assembly is demolded, numbered and cured as required; after curing, the excess concrete is cut and the cured assembly is cut into standard specimens; S10: Repeat S1-S9, change the angle X, and prepare multiple rock-concrete assemblies with different angles.

[0013] Further, the weighed yellow sand is poured into the mixer, and the mixer is dry-mixed for 45 seconds and then stopped; the weighed silica fume is poured into the mixer, and dry-mixed again for 45 seconds and then stopped; then, the weighed cement is poured into the mixer, and stirred for 45 seconds and then stopped; the aqueous solution containing the water reducer is poured into the mixer, and stirred for 60 seconds and then stopped, and the concrete attached to the inner wall of the mixer is scraped off into the mixer cavity, and the concrete attached to the mixer stirring rod is scraped off into the mixer cavity, and after ensuring that there is no concrete attached to the inner wall of the mixer and the surface of the stirring rod, the mixer is turned on again for 60 seconds to complete the mixing of the concrete slurry.

[0014] Furthermore, in step S9, the curing conditions are: temperature 20°C ± 2°C, relative humidity greater than 95%; and curing time is 28 days.

[0015] Furthermore, in step S5, the mass ratio of cement, yellow sand, water, water reducing agent and silica fume is 1:0.5:0.25:0.01:0.08; and the stirring speed of the mixer is 10-15PRM.

[0016] Further, in step S7, the vibration time T is 60 seconds.

[0017] Further, in step S9, the period of time M is 24 hours. Beneficial Effects

[0018] The preparation mold and preparation method can produce rock-concrete combination samples, and can change the angle of the angle X to produce rock-concrete combination samples with different angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of unit A and unit B; Figure 2 It is a schematic diagram of the structure inside the sample mold.

[0020] Figure 3 It is a schematic diagram of the structure of the rock-concrete composite specimen.

[0021] 1. Unit A; 2. Unit B; 3. Empty slot; 4. Hoop; 5. First fixing buckle; 6. Grouting pipe; 7. Grouting pump; 8. Grouting valve; 9. Grouting pipe; 10. Grouting valve; 11. Vibrating table; 12. Snap ring; DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0023] Embodiment 1: A mold for preparing a rock-concrete composite sample, comprising: Two identical mold units are respectively denoted as unit A1 and unit B2. In this embodiment, the materials of unit A1 and unit B2 are both organic glass. Unit A1 and unit B2 can be assembled into a complete sample mold. The shape of the sample mold is a rectangular parallelepiped. In this embodiment, the specification of the sample mold is 75*75*140mm (length*width*height). Figure 1 The left-right direction is long, the vertical direction is high, and the direction along the paper surface is wide. A cylindrical empty slot 3 is provided inside the sample mold, and the operator can observe the empty slot 3 through the sample mold. In this embodiment, the specification of the empty slot 3 is 50*100 (diameter*height). The axis of the empty slot 3 is set vertically, and the splicing surface of the unit A1 and the unit B2 is set vertically. The empty slot 3 is divided into two parts by the splicing surface.

[0024] Two hoops 4 are respectively sleeved on the upper and lower outer walls of the sample mold to clamp unit A1 and unit B2 tightly so that unit A1 and unit B2 are not loose as a whole and always form a complete sample mold.

[0025] Grouting port, see Figure 2 , opened at the upper end of the sample mold, and connected to the internal empty groove 3 of the sample mold; a first fixing buckle 5 is installed at the grouting port; One end of the grouting pipe 6 is connected to the inner hollow groove 3 of the sample mold through the grouting port; the end of the grouting pipe 6 is mounted on the sample mold through the first fixing buckle 5. The other end of the grouting pipe 6 is in the concrete slurry.

[0026] A grouting pump 7, installed on the grouting pipe 6, for injecting concrete slurry into the empty groove 3 through the grouting pipe 6; The grouting valve 8 is installed on the grouting pipe 6 and is used to control the opening and closing of the grouting pipe 6.

[0027] The slurry outlet is provided at the upper end of the sample mold and communicates with the internal hollow groove 3 of the sample mold; a second fixing buckle is installed at the slurry outlet; One end of the slurry outlet pipe 9 is connected to the internal hollow groove 3 of the sample mold through the slurry outlet port. This end of the slurry outlet pipe 9 is installed on the sample mold through a second fixing buckle, and the other end is connected to the outside of the sample mold.

[0028] The slurry discharge valve 10 is installed on the slurry discharge pipe 9 and is used to control the opening and closing of the slurry discharge pipe 9.

[0029] The vibration table 11 has a clamping ring 12 installed on the table for placing the lower end of the sample mold. The clamping ring 12 is adapted to the shape of the lower end of the sample mold. The clamping ring 12 is sleeved on the lower end of the sample mold. The clamping ring 12 is threaded with a screw. The axis of the screw is horizontally arranged. The screw can abut against the outer wall of the sample mold by screwing. The screw is screwed to make the screw abut against the outer wall of the sample mold. The sample mold is restricted by the screw to prevent the sample mold from detaching from the vibration table 11 when the vibration table 11 vibrates.

[0030] Example 2: A method for preparing a rock-concrete composite sample, comprising the following steps: S1: Select a complete and defect-free rock block, use a coring machine to drill the core of the rock block; process the core to prepare it into a cylindrical rock standard sample that meets the requirements; complete and defect-free means that there are no obvious cracks and faults inside the rock block; no obvious explanation means that it is not easily perceived by the human eye.

[0031] In this embodiment, the specification of the rock standard sample that meets the requirements is 50*100 mm (diameter*height), and the diameter of the rock standard sample is equal to the diameter of the empty slot.

[0032] S2: Use an infrared rock cutting machine to cut a standard rock specimen along its side wall into two semi-rock specimens. The cut surface of the standard rock specimen is a plane. Let the angle between the cut surface and the horizontal plane be X, where 0 < X < 90 degrees, ensuring that the cut surface is neither horizontal nor vertical. Cutting along the side wall of the standard rock specimen means that both the starting point and the ending point of the cut surface are located on the side wall of the standard rock specimen.

[0033] S3: Uniformly coat the inner wall of the empty groove with a release agent to ensure smooth demolding later. After coating the release agent, place one of the semi-rock specimens formed by cutting into the empty groove, ensuring that the cut surface of the semi-rock specimen is at the upper end of the semi-rock specimen, i.e., Figure 2 as shown; Unit A and unit B form a specimen mold using a hoop. The outer wall of the semi-rock specimen fits against the inner wall of the specimen mold. The hoop is put on to ensure that the specimen mold does not come loose and the concrete slurry does not flow out.

[0034] S4: Use the first fixing buckle and the second fixing buckle respectively to connect the specimen mold containing the semi-rock specimen to the grouting pipe and the slurry outlet pipe, and wait for the concrete slurry to be poured. S5: Prepare the concrete slurry. Pour the weighed yellow sand into the mixer and stop the mixer after dry mixing for 45 seconds. Then pour the weighed silica fume into the mixer and stop the mixer again after dry mixing for 45 seconds. Then, pour the weighed cement into the mixer and continue to stop the mixer after dry mixing for 45 seconds. Then, pour the aqueous solution containing the water reducing agent into the mixer and stop the mixer after stirring for 60 seconds. Scrape the concrete attached to the inner wall of the mixer into the cavity of the mixer, and at the same time scrape the concrete attached to the mixer stirring rod into the cavity of the mixer. After ensuring that there is no attached concrete on the inner wall of the mixer and the surface of the stirring rod, start the mixer again and stir for 60 seconds to complete the mixing work of the concrete slurry. In this embodiment, the water reducing agent is polycarboxylic acid. The mixing speed of the mixer is 10 - 15 PRM. The dosage and mass ratio of each material in S5 are shown in Table 1.

[0035] Table 1 Dosage and mass ratio of each material Material 52.5 Cement yellow sand water Water reducing agent Silica Fume Dosage / g 300 150 75 3 24 Quality Ratio 1 0.5 0.25 0.01 0.08 S6: Open the grouting valve, the slurry outlet valve and the grouting pump in sequence. Observe the end of the slurry outlet pipe far from the specimen mold. If the concrete slurry flows out from this end of the slurry outlet pipe, then close the grouting pump, the slurry outlet valve and the grouting valve in sequence. S7: Turn on the vibration table and vibrate for 60 seconds; observe whether the area in the empty slot except the half body of the rock sample is filled with concrete; if there is a gap, remove the grouting pipe at the first fixing buckle or the slurry outlet pipe at the second fixing buckle, and use a syringe to extend into the empty slot through the grouting port or the slurry outlet to fill the gap with concrete slurry; then, turn on the vibration table again for 60 seconds until there is no gap in the empty slot except the half body of the rock sample.

[0036] S8: Remove the sample mold containing the rock-concrete assembly from the vibration table; remove the grouting pipe and the slurry outlet pipe from the first fixing buckle and the second fixing buckle respectively; seal the grouting port and the slurry outlet with rubber plugs to prevent water loss during the initial setting process of the concrete sample.

[0037] S9: After 24 hours of pouring the rock-concrete assembly, the assembly is demolded, the assembly is numbered, and the numbered assembly is placed in a curing box for 28 days. The curing conditions are: temperature 20℃±2℃, relative humidity greater than 95%. Cut the excess concrete and cut the cured assembly into standard specimens. The standard specimen is cylindrical and the size of the standard specimen is 50*100mm (diameter*height). The cut standard specimen is shown in Figure 3 .

[0038] S10: Repeat S1-S9, change the angle X, and prepare multiple rock-concrete assemblies with different angles.

[0039] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A mold for preparing a rock-concrete composite sample, characterized in that: Comprising: Two identical mold units, denoted as unit A and unit B respectively. Unit A and unit B can be assembled into a complete specimen mold. There is an empty groove inside the specimen mold, and the shape of the empty groove is cylindrical. Let the axis of the empty groove be arranged vertically. The splicing surface of unit A and unit B is arranged vertically and divides the empty groove into two equal parts; Two hoop rings, respectively sleeved on the outer walls of the upper and lower ends of the specimen mold, for keeping unit A and unit B always assembled into a complete specimen mold; A grouting port, opened at the upper end of the specimen mold, for communicating with the empty groove; A grouting pipe, one end of which is installed at the grouting port through a first fixing buckle and communicates with the empty groove, and the other end is in the concrete slurry; A grouting pump, installed on the grouting pipe, for injecting concrete slurry into the empty groove through the grouting pipe; A grouting valve, installed on the grouting pipe, for controlling the opening and closing of the grouting pipe; An outlet port, opened at the upper end of the specimen mold, for communicating with the empty groove; An outlet pipe, one end of which is installed at the outlet port through a second fixing buckle and communicates with the empty groove, and the other end is outside the specimen mold; An outlet valve, installed on the outlet pipe, for controlling the opening and closing of the outlet pipe; A vibrating table, on the table surface of which there is a clamping ring, the clamping ring is adapted to the lower end of the specimen mold, the clamping ring is sleeved on the lower end of the specimen mold, and there is a screw threadedly connected to the clamping ring for restricting the specimen mold on the vibrating table.

2. A preparation mold for a rock-concrete composite sample according to claim 1, characterized in that: The materials of unit A and unit B are organic glass materials.

3. A preparation mold for a rock-concrete composite sample according to claim 2, characterized in that: The grouting pipe can be detached from the specimen mold through the first fixing buckle; the outlet pipe can be detached from the specimen mold through the second fixing buckle.

4. A method for preparing a rock-concrete composite sample, based on the mold for preparing a rock-concrete composite sample according to claim 3, characterized in that: Including the following steps: S1: Select a complete and defect-free rock block, drill the rock core of the rock block, and process the rock core to prepare a cylindrical rock standard specimen that meets the requirements. The diameter of the rock standard specimen is equal to the diameter of the empty groove. The meaning of complete and defect-free is that there are no fissure faults inside the rock block; S2: Cut the rock standard specimen along the side wall of the rock standard specimen into two rock specimen semi-bodies. The cut surface of the rock standard specimen is a plane. Let the angle between the cut surface and the horizontal plane be X, then 0 < X < 90 degrees. Along the side wall of the rock standard specimen means that the starting point and the ending point of the cut surface are both located on the side wall of the rock standard specimen; S3: Uniformly coat the inner wall of the empty groove with a release agent to ensure smooth demolding. Put one of the rock specimen semi-bodies into the empty groove, ensuring that the cut surface of the rock specimen semi-body is at the upper end of the rock specimen semi-body; Unit A and unit B form a specimen mold by using the hoop rings to ensure that the specimen mold does not come loose and the concrete slurry does not flow out; S4: Respectively use the first fixing buckle and the second fixing buckle to connect the specimen mold containing the rock specimen semi-body with the grouting pipe and the outlet pipe respectively, and wait for the concrete slurry to be poured; S5: Prepare the concrete slurry according to the requirements; S6: Open the grouting valve, the outlet valve and the grouting pump in sequence, observe the end of the outlet pipe far away from the specimen mold. If the concrete slurry flows out from this end of the outlet pipe, then close the grouting pump, the outlet valve and the grouting valve in sequence; S7: Turn on the vibration table for a vibration time of T; observe whether the area in the empty slot except the half of the rock sample is filled with concrete; if there is a gap, remove the grouting pipe at the first fixing buckle or the slurry outlet pipe at the second fixing buckle, and use a syringe to extend into the empty slot through the grouting port or the slurry outlet, and use the syringe to fill the gap with concrete slurry; then, turn on the vibration table again for a time of T until there is no gap in the area in the empty slot except the half of the rock sample; S8: Remove the sample mold containing the rock-concrete assembly from the vibration table; remove the grouting pipe and the grouting pipe from the first fixing buckle and the second fixing buckle respectively; seal the grouting port and the grouting port with rubber plugs to prevent water loss during the initial setting process of the concrete sample; S9: After the rock-concrete assembly is poured for a period of time M, the assembly is demolded, numbered and cured as required; after curing, the excess concrete is cut and the cured assembly is cut into standard specimens; S10: Repeat S1-S9, change the angle X, and prepare multiple rock-concrete assemblies with different angles.

5. The method for preparing a rock-concrete composite sample according to claim 4, characterized in that: In step S5, the weighed yellow sand is poured into the mixer, and the mixer is dry-mixed for 45 seconds and then stopped; the weighed silica ash is poured into the mixer, and the mixer is dry-mixed for another 45 seconds and then stopped; Then, pour the weighed cement into the mixer and stop stirring after 45 seconds; pour the aqueous solution containing the water reducing agent into the mixer and stop stirring after 60 seconds, scrape the concrete attached to the inner wall of the mixer into the mixer cavity, and at the same time scrape the concrete attached to the mixer stirring rod into the mixer cavity. After ensuring that there is no concrete attached to the inner wall of the mixer and the surface of the stirring rod, start the mixer again and stir for 60 seconds to complete the mixing of the concrete slurry.

6. The method for preparing a rock-concrete composite sample according to claim 4, characterized in that: In step S9, the curing conditions are: temperature 20°C ± 2°C, relative humidity greater than 95%; and curing time is 28 days.

7. The method for preparing a rock-concrete composite sample according to claim 5, characterized in that: In step S5, the mass ratio of cement, yellow sand, water, water reducing agent and silica fume is 1:0.5:0.25:0.01:0.08; and the stirring speed of the mixer is 10-15PRM.

8. The method for preparing a rock-concrete composite sample according to claim 4, characterized in that: In step S7, the vibration time T is 60 seconds.

9. The method for preparing a rock-concrete composite sample according to claim 4, characterized in that: In step S9, the period of time M is 24 hours.

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