Device and method for preparing cemented body sample of structured cemented granular material

Abstract

The present disclosure provides a cement body sample preparation device and a preparation method for structured cemented granular materials, including a single-particle loading platform preparation component, which is used to prepare a single-particle loading platform composed of a loading platform and a single particle arranged at the center thereof, the single particle is used to simulate the aggregate in the cement body, and the loading platform is convenient for testing the prepared cement body sample; and a cement body preparation component, which is used to align the first single-particle loading platform and the second single-particle loading platform, and fill the gap between the first single particle and the second single particle with cementing material, and after the cementing material is solidified, it together with the first single-particle loading platform and the second single-particle loading platform constitutes a cement body sample. The present disclosure realizes a standardized preparation process for cement body samples, realizes the integrated centering of particle-cement bodies, and can prepare cement bodies of different sizes, shapes and material types, laying a foundation for promoting the micro-scale and mechanism research of structured cemented granular materials.

Description

Technical Field

[0001] The present disclosure relates to the technical field of engineering material preparation, and in particular to a device for preparing a cementing body sample of a structured cementing granular material and a preparation method thereof. Background Art

[0002] Rock-Filled Concrete technology is a new type of large-volume concrete technology proposed by the applicant's research and development team in 2003. Based on the flow law, blocking mechanism, filling performance and deposition characteristics of self-compacting cementing materials in the rockfill voids during the research and development of rock-fill concrete dams, the applicant further developed and proposed structured cementing granular materials and their preparation methods (patent number: ZL201810284687.4). Figure 1 Structured bonded granular material refers to the use of structured bonding technology to pour self-compacting bonding materials into specific areas inside densely packed particles (such as rock aggregates), so that the bonding materials adhere to the contact points of the particles and fill the pores between some particles. The two adjacent particles and the bonding materials filled in their gaps together form a bonding body. Structured bonded granular material is a new type of composite material between a continuum and a granular body. It can achieve a relative balance in terms of overall strength, deformation modulus, permeability and failure ductility of the material. It is an emerging environmentally friendly building material in the fields of water conservancy, hydropower and marine engineering.

[0003] In order to further quantitatively explore the mechanical behavior of structured cemented granular materials and establish the relationship between the macroscopic mechanical properties and microscopic cementing structure of structured cemented granular materials, it is necessary to conduct more microscopic-scale experimental studies on structured cemented granular materials, that is, to carry out a large number of experimental studies on the cementing bodies of structured cemented granular materials. However, due to the lack of preparation equipment and methods for sample preparation of structured cemented granular materials, there are few studies on related cementing bodies.

[0004] In summary, there is an urgent need for a preparation device for a cemented body sample of a structured cemented granular material, to realize a standardized sample preparation process for a cemented body sample of a structured cemented granular material, to realize the integrated centering of particles and cemented bodies, and to realize the preparation of cemented bodies of different sizes, shapes and material types. The present invention lays a foundation for promoting the research on the microscale, constitutive model and mechanism of structured cemented granular materials, and promotes the solution of key problems in the performance and structural analysis of structured cemented granular materials. Summary of the invention

[0005] The present disclosure aims to solve at least one of the technical problems existing in the prior art.

[0006] To this end, the device for preparing samples of the cementing body of structured cemented granular materials provided in the first aspect of the embodiment of the present disclosure can realize the standardized sample preparation process of the cementing body of structured cemented granular materials, realize the integrated alignment of particles and cementing bodies, and realize the preparation of cementing bodies of different sizes, shapes and material types, thereby providing a guarantee for carrying out a large number of experimental studies on the cementing bodies of structured cemented granular materials.

[0007] In order to achieve the above objectives, the first embodiment of the present disclosure adopts the following technical solutions:

[0008] The first aspect of the present disclosure provides a cemented body sample preparation device for structured cemented granular materials, comprising:

[0009] A single particle loading platform preparation component is used to prepare a single particle loading platform, the single particle loading platform comprises a loading platform and a single particle arranged at the center of the loading platform, the single particle is used to simulate the aggregate in the cementitious body, and the loading platform is convenient for testing the prepared cementitious body sample;

[0010] The cement body sample preparation component is used to align the first single particle loading platform and the second single particle loading platform prepared by the single particle loading platform preparation component, and fill the gap between the first single particle of the first single particle loading platform and the second single particle of the second single particle loading platform with a cementing material, and after the cementing material is cured, it forms a cement body sample together with the first single particle loading platform and the second single particle loading platform.

[0011] The first embodiment of the present disclosure provides a device for preparing a cemented body sample, which has the following characteristics and beneficial effects:

[0012] The cementing body sample preparation device provided in the first aspect of the embodiment of the present disclosure realizes the standardized sample preparation process of the cementing body of structured cementing granular materials, realizes the integrated centering of particles and cementing bodies, and realizes the preparation of cementing body samples of different sizes, shapes and material types. It lays a foundation for carrying out a large number of cementing body test studies on structured cementing granular materials, provides a guarantee for further quantitative exploration of the mechanical behavior of structured cementing granular materials, lays a foundation for promoting the study of the constitutive model and mechanism of structured cementing granular materials, provides support for establishing the connection between the macroscopic mechanical properties and microscopic cementing structure of structured cementing granular materials, and promotes the solution of key problems in the performance and structural analysis of structured cementing granular materials.

[0013] In some embodiments, the single particle loading platform preparation assembly includes an open mold and a centering member, the centering member includes a slot hole arranged at the center of the bottom plate of the open mold and a gasket matching the slot hole; the single particle is placed on the centering member in the open mold, and a bonding material is poured in the space formed between the single particle and the open mold to form the loading platform.

[0014] In some embodiments, the height of the side plate of the open mold is 50% to 60% of the diameter of the single particle.

[0015] In some embodiments, the cement sample preparation assembly includes a positioning guide rail, and a first positioning plate, a forming plate, and a second positioning plate that pass through the positioning guide rail and are centrally arranged in sequence, the first positioning plate is used to fix and move the first single particle loading platform, the second positioning plate is used to fix and move the second single particle loading platform, and the forming plate is used to form a cement body after pouring the cement material in the gap between the first single particle and the second single particle.

[0016] In some embodiments, a first hole for the positioning guide rail to pass through is respectively provided at the corner of the molding plate, and a first positioning member is also respectively provided at the corner of the molding plate for adjusting the position of the molding plate on the positioning guide rail. A second hole is provided at the center of the molding plate, and a space for accommodating the bonding material of the bonding body is formed between the second hole, the first single particle and the second single particle. The size of the second hole should ensure that the first particle, the second single particle and the bonding material can be bonded and formed.

[0017] In some embodiments, the diameter of the second pore is 25% to 100% of the diameter of the single particle.

[0018] In some embodiments, the shapes of the second hole include circle, ellipse and polygon.

[0019] In some embodiments, the molding plate is a split plate, and matching first protrusions and first grooves are respectively provided on the split parts, and the cross-sectional shapes of the first protrusions and first grooves are triangular, square or semicircular.

[0020] In some embodiments, the first positioning plate and the second positioning plate have the same structure, and a third hole for the positioning guide rail to pass through is respectively provided at the corner of the positioning plate. A second positioning member is also respectively provided at the corner of the positioning plate for adjusting the position of the positioning plate on the positioning guide rail. A fourth hole matching the size of the loading platform is formed in the middle of the positioning plate, and a support for placing the loading platform is provided in the fourth hole. The support cooperates with the third positioning member provided on the positioning plate to fix the single particle loading platform.

[0021] In some embodiments, the positioning plate is a split plate, and matching second protrusions and second grooves are respectively provided on the split parts, and the cross-sectional shapes of the second protrusions and second grooves are triangular, square or semicircular.

[0022] In some embodiments, the bonding material is self-compacting cement paste, self-compacting cement mortar, self-compacting concrete, gypsum, epoxy resin, marble glue or glass glue.

[0023] In some embodiments, the single particle is a sphere or a non-sphere.

[0024] The second embodiment of the present disclosure adopts the following technical solution:

[0025] The second aspect of the present disclosure provides a method for preparing a colloid sample based on the above-mentioned colloid sample preparation device, comprising:

[0026] S1, using the single particle loading platform preparation assembly to prepare a first single particle loading platform and a second single particle loading platform;

[0027] S2, assembling the first single particle loading platform and the first positioning plate into a first structure, assembling the first structure on the positioning rail and fixing it; assembling the forming plate on the positioning rail close to the first single particle, moving the forming plate along the positioning rail in a direction close to the first structure until the forming plate can no longer be moved, fixing the forming plate to the positioning rail, and applying a leak-proof agent at the joint between the first single particle and the forming plate; assembling the second single particle loading platform and the second positioning plate into a second structure in a manner that the second single particle faces upward, assembling the second structure on the positioning rail after being turned upside down and fixing it, and the first structure and the second structure are located on both sides of the forming plate;

[0028] S3, injecting a gelling material into the molding plate from a side of the molding plate close to the second structure; moving the second structure along the positioning guide rail toward the molding plate until the second structure cannot be moved any further, and then fixing the second positioning plate to the positioning guide rail;

[0029] S4. Clean the excess gelling material overflowing from the side of the forming plate close to the second structure, remove the first positioning plate, the forming plate and the second positioning plate after the gelling material is solidified, and perform curing on the obtained sample to obtain the cemented body sample.

[0030] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present application is described in detail below in conjunction with the accompanying drawings. However, it should be understood that the drawings are provided only for a better understanding of the present application and should not be construed as limiting the present application.

[0032] Figure 1 It is a schematic diagram of the structure of the existing structured cemented granular material and the cemented body formed inside it;

[0033] Figure 2 is a schematic diagram of a single particle loading platform preparation assembly according to an embodiment of the present disclosure;

[0034] Figure 3 A schematic diagram of a single particle loading platform according to an embodiment of the present disclosure;

[0035] Figure 4 A schematic diagram of a binder preparation assembly according to an embodiment of the present disclosure;

[0036] Figure 5 A schematic diagram of a middle forming plate according to an embodiment of the present disclosure;

[0037] Figure 6 This is a schematic diagram of a middle forming plate after being split in half according to an embodiment of the present disclosure;

[0038] Figure 7 A schematic diagram of a positioning plate according to an embodiment of the present disclosure;

[0039] Figure 8 This is a schematic diagram of a positioning plate after being split in half according to an embodiment of the present disclosure;

[0040] Fig. 9 A schematic diagram of a cemented body sample according to an embodiment of the present disclosure;

[0041] Fig.10 The present invention is a flow chart of a method for preparing a structured cemented granular material cementitious body sample according to an embodiment of the present invention.

[0042] Description of the symbols in the accompanying drawings:

[0043] 110, opening mold; 120, centering member; 121, slot; 122, gasket; 131, first single particle loading platform; 132, second single particle loading platform;

[0044] 210, positioning rail; 220, forming plate; 221, first hole; 222, first positioning member; 223, second hole; 224, first protrusion; 225, first groove; 226, square hole; 230, first positioning plate; 231, third hole; 232, second positioning member; 233, fourth hole; 234, support platform; 235, third positioning member; 236, second protrusion; 237, second groove; 240, second positioning plate. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0046] On the contrary, the present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application as defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the detailed description of the present application below. Those skilled in the art can fully understand the present application without the description of these details.

[0047] See also Figure 2 to Figure 8 ,,The first aspect of the present disclosure provides a cemented body sample preparation device for structured cemented granular materials, comprising:

[0048] A single particle loading platform preparation component is used to prepare a single particle loading platform, the single particle loading platform comprises a loading platform and a single particle arranged at the center of the loading platform, the single particle is used to simulate the aggregate in the cementitious body, and the loading platform is convenient for testing the prepared cementitious body sample;

[0049] The cement body sample preparation component is used to align the first single particle loading platform and the second single particle loading platform prepared by the single particle loading platform preparation component, and fill the gap between the first single particle of the first single particle loading platform and the second single particle of the second single particle loading platform with cementing material, and after the cementing material is cured, it together with the first single particle loading platform and the second single particle loading platform constitutes a cement body sample.

[0050] In some embodiments, see Figure 2 The single particle loading platform preparation assembly is composed of an opening mold 110 and a centering member 120. The opening mold 110 is composed of four side plates (see Figure 2 The black area in the middle) and a base plate (see Figure 2The opening mold 110 is composed of a plurality of side panels and a bottom panel, and the four side panels and the bottom panel can be assembled and spliced ​​by bolt holes and corresponding bolts. The height of the side panels is 50% to 60% of the diameter of a single particle. A release agent is evenly coated on the inner wall of the opening mold 110 to facilitate subsequent demolding. The centering member 120 is composed of a slot hole 121 arranged at the center of the bottom panel of the opening mold 110 and a gasket 122 of the same size placed in the slot hole 121, and the gasket 122 and the slot hole 121 are in close fit. When preparing a single particle loading platform, by placing a single particle in the centering member 120, on the one hand, the single particle and the open mold 110 can be quickly aligned, and on the other hand, the relative displacement between the single particle and the open mold 110 can be limited. After the single particle and the open mold 110 are aligned, a part of the single particle is located inside the open mold 110 and the other part is located outside the open mold 110. A gelling material for forming a loading platform is poured into the centering mold 110. After the gelling material solidifies (usually 24 hours), the open mold 110 is removed to obtain a Figure 3 The single particle loading platform shown in the figure. The setting of the loading platform is convenient for centering and fixing the single particle on the one hand, and for testing the final prepared cement body sample on the other hand.

[0051] In one embodiment, the slot 121 is a circular groove disposed at the center of the bottom plate of the open mold 110 , with a diameter of 7 mm and a depth of 0.6 mm. The gasket 122 is an annular gasket with a diameter matching that of the slot 121 .

[0052] In some embodiments, see Figure 4 The cement sample preparation component includes a positioning guide rail 210, and a first positioning plate 230, a molding plate 220 and a second positioning plate 240 that pass through the positioning guide rail 210 and are centrally arranged in sequence. The first positioning plate 230 is used to fix and move the first single-particle loading platform 131, and the second positioning plate 240 is used to fix and move the second single-particle loading platform 132. The molding plate 220 is used to cast the cement material between the first single particle of the first single-particle loading platform 131 and the second single particle of the second single-particle loading platform 132 to form a cement body, and the molding plate 220 can form cement bodies of different sizes, shapes and material types.

[0053] In some embodiments, see Figure 5A first hole 221 for the positioning guide rail 210 to pass through is respectively provided at the four corners of the forming plate 220, so that the forming plate 220 can move freely on the positioning guide rail 210. A first positioning member 222 is also respectively provided at the four corners of the forming plate 220 for adjusting the position of the forming plate 220 on the positioning guide rail 210. The first positioning member 222 includes a first bolt hole provided at the corner of the forming plate 220 and connected to the first hole 221, and a first bolt matched with the first bolt hole. The tightening and loosening between the forming plate 220 and the positioning guide rail 210 are achieved by screwing the first bolt into or out of the first bolt hole. A second hole 223 is provided at the center of the forming plate 220 for forming a cementitious body after pouring the cementitious material. The second hole 223 is preferably a circular hole. The present disclosure is also applicable to second holes 223 of other shapes. A space for accommodating the cementitious material is formed between the second hole 223, the first single particle and the second single particle. The size of the second hole 223 should ensure that the first particle of the first single particle loading platform 131, the second single particle of the second single particle loading platform 132 and the cementitious material can be bonded and formed. Optionally, the diameter of the second hole 223 is 25% to 100% of the diameter of the single particle. At this time, the distance between the first single particle and the second single particle that partially enter the second hole 223 from both sides of the second hole 223 is 10% to 0% of the diameter of the single particle; square holes 226 are provided on both sides of the forming plate 220 to facilitate the removal of the forming plate 220 after the cementitious material is formed; the middle forming plate 220 is in the form of a left-right split, see Figure 6 The left and right split parts are respectively provided with a first horizontal protrusion 224 and a first groove 225, and the cross-sectional shapes of the first protrusion 224 and the first groove 225 are matched (such as square or semicircular or other shapes, preferably triangle, and the forming rate of triangle is higher than other shapes), which is convenient for overlapping the left and right parts and for removing the forming plate 220 after the adhesive body is formed. The forming plate 220 can be taken out from the positioning guide rail 210, and by using the forming plate 220 with the second holes 223 of different sizes and shapes, adhesive bodies of different sizes, shapes and material types can be formed, and different adhesive body samples can be further formed.

[0054] In some embodiments, the first positioning plate 230 and the second positioning plate 240 have the same structure and size. The first positioning plate 230 and the second positioning plate 240 are symmetrically arranged on the upper and lower sides of the molding plate 220. The first positioning plate 230 is now taken as an example for description. Figure 7A third hole 231 for the positioning guide rail 210 to pass through is respectively provided at the four corners of the first positioning plate 230, so that the first positioning plate 230 can move freely on the positioning guide rail 210. A second positioning member 232 is also respectively provided at the four corners of the first positioning plate 230 for adjusting the position of the first positioning plate 230 on the positioning guide rail 210. The second positioning member 232 includes a second bolt hole provided at the corner of the first positioning plate 230 and connected to the third hole 231, and a second bolt matched with the second bolt hole. The first positioning plate 230 and the positioning guide rail 210 are tightened and loosened by screwing the second bolt into or out of the second bolt hole. A fourth hole 233 is provided in the middle of the first positioning plate 230, and the size of the fourth hole 233 is the same as the bottom size of the loading platform in the first single particle loading platform 131, so that the first single particle loading platform 131 can fit with the fourth hole 233 in the middle of the first positioning plate 230; a support 234 is provided on both sides of the fourth hole 233 of the first positioning plate 230, and the support 234 is connected to a third positioning member 235 (the third positioning member 235 includes a The third bolt hole and the third bolt matched with the third bolt hole are matched to fix the first single particle loading platform 131 by screwing the third bolt into or out of the third bolt hole to achieve the tightening and loosening between the first positioning plate 230 and the first single particle loading platform. Specifically, the bottom surface of the support 234 is flush with the bottom surface of the first positioning plate 230, and the top surface of the support 234 is lower than the top surface of the first positioning plate 230. The third bolt passes over the top surface of the support 234 and contacts the first single particle loading platform 131. The first positioning plate is in the form of a left-right split, see Figure 8 , the left and right parts are respectively provided with a second horizontal protrusion 236 and a second groove 237, and the cross-sectional shape of the second protrusion 236 and the second groove 237 are matched (such as both adopting other shapes such as square or semicircular, preferably both are triangular, and the forming rate of triangle is higher than other shapes), which is convenient for overlapping each other and for removing the first positioning plate 230 after the cementing body sample is formed. When assembling the second single particle loading platform 132 and the second positioning plate 240, it is necessary to first place the second positioning plate 240 that is flush with one side of the base downward, and then place the second single particle loading platform 132 on the base of the second positioning plate 240 with the second single particle facing upward, tighten the third bolt to form the second single particle loading platform 132 and the second positioning plate 240 into a whole, and then turn the whole upside down 180° (at this time, the second single particle is set downward) and install it on the positioning guide rail 210. The cementing body sample of the structured cementing granular material prepared by the preparation device provided by the embodiment of the first aspect of the present disclosure is as follows: Fig. 9 shown.

[0055] In some embodiments, the positioning rail 210 is composed of four cylinders of the same size, and the forming plate 220 , the first positioning plate 230 , and the second positioning plate 240 can all move up and down on the positioning rail 210 .

[0056] See also Fig.10 The method for preparing a cemented body sample of structured cemented granular material using the above-mentioned preparation device provided in the second aspect of the present disclosure comprises:

[0057] S1. Prepare a single particle loading platform. Place the single particle loading platform preparation assembly on a flat test bench, place the gasket 122 in the slot 121 of the open mold 110, evenly apply a release agent on the inner wall of the open mold 110, and then place the spherical particles on the gasket 122 to align with the open mold 110; slowly pour the prepared gelling material into the open mold 110, wait for 24 hours, and then remove the open mold 110; follow the same steps to obtain the first single particle loading platform 131 and the second single particle loading platform 132;

[0058] S2, assembling the adhesive preparation assembly. The second protrusion 236 and the second groove 237 of the left and right split parts of the first positioning plate 230 are engaged with each other to assemble the first positioning plate 230, and the third holes 231 at the four corners of the first positioning plate 230 are respectively inserted into the corresponding positioning rails 210, and the first single particle loading platform 131 is placed on the support 234 of the first positioning plate 230, so that the bottom surface of the first single particle loading platform 131 is aligned and closely fits with the fourth hole 233 in the first positioning plate 230, and then the first positioning plate 230 is used to load the first single particle loading platform 131. The third positioning members 235 arranged around the molding plate 220 fix the position of the first single particle loading platform 131; the first protrusions 224 and the first grooves 225 of the left and right split parts of the molding plate 220 are engaged with each other to assemble the molding plate 220, and the first holes 221 at the four corners of the molding plate 220 are respectively inserted into the corresponding positioning guide rails 210, and the molding plate 220 is translated downward until it is in full contact with the first single particle of the first single particle loading platform 131 (when the molding plate 220 can no longer move downward, it is considered that it is in full contact with the first single particle ), tighten the first bolt at the corner of the molding plate 220 to fix the molding plate 220 to the positioning guide rail 210, apply high vacuum silicone grease to the joint between the first single particle and the molding plate 220 for leak-proof treatment to prevent the gel material from overflowing from the joint between the first single particle and the molding plate 220 during the subsequent injection of the gel material; engage the second protrusion 236 and the second groove 237 of the left and right split parts of the second positioning plate 240 with each other to assemble the second positioning plate 240, and place the second positioning plate 240 flush with one side of the support platform. The plate 240 is placed with one side facing downward, and then the second single particle loading platform 132 is placed on the support platform of the second positioning plate 240 with the second single particle facing upward, and the third bolt is tightened to form the second single particle loading platform 132 and the second positioning plate 240 into a whole, and the whole is flipped upside down 180° (the second single particle is set downward at this time) and inserted into the positioning guide rail 210, and fixed to the top of the positioning guide rail 210 with the second bolt on the side of the second positioning plate 240, so as to reserve space for the subsequent pouring of cementitious material;

[0059] S3. Pouring gelling material. Prepare gelling material and inject a certain volume of gelling material into the second hole 223 in the middle of the molding plate 220; loosen the second positioning member 232 on the side of the second positioning plate 240, slowly move the second positioning plate 240 downward until the second single particle of the second single particle loading platform 132 is in full contact with the molding plate 220 (when the second single particle loading platform 132 can no longer move downward, it is considered to be in full contact with the molding plate 220), and slowly squeeze out the excess gelling material in the second hole 223 in the middle of the molding plate 220 to prevent the formation of holes and bubbles;

[0060] S4, curing the sample. Clean the excess cementitious material overflowing from the upper surface of the forming plate 220; after 24 hours, remove the first positioning plate 230, the forming plate 220, and the second positioning plate 240, and cure the obtained sample under the set conditions for a certain age to obtain the following Fig. 9 The cemented body specimen shown.

[0061] Furthermore, the preparation method of the disclosed embodiment can prepare cementitious samples of different sizes, shapes and materials. Among them, cementitious samples of different sizes include cementitious samples of different widths, thicknesses, areas and volumes; cementitious samples of different shapes include cementitious samples whose cross-sectional shapes are polygons such as circles, ellipses and triangles, and cementitious samples whose cross-sectional shapes are curved polygons; cementitious samples of different material types include cementitious samples formed by cementitious materials such as self-compacting cement paste, self-compacting cement mortar, self-compacting concrete, gypsum, epoxy resin, marble glue, glass glue, etc. Single particles include spheres or non-spheres made of ceramics, rocks, metal balls and non-metals.

[0062] The present disclosure is described below with reference to specific embodiments. It should be noted that these embodiments are merely illustrative and do not limit the present disclosure in any way.

[0063] Example 1

[0064] In this embodiment, a structured cementing granular material cementing body sample with a larger cementing body size is prepared using a high-performance self-compacting slurry. The spherical particles are high-alumina ceramic balls with a particle size of 50 mm; the length, width and height of the formed loading platform are 70 mm×70 mm×30 mm; the cementitious material is a high-performance self-compacting cement slurry, the cement slurry water-cement volume ratio is 1, and the cement slurry expansion is 280 mm; the second hole 223 of the forming plate 220 in the cementing body preparation assembly is a circular hole with a diameter of 40 mm and a thickness of 20 mm, and the cementing body formed after casting is a cylindrical structure with a diameter of 40 mm and a thickness of 20 mm.

[0065] Example 2

[0066] In this embodiment, a structured cementing particle material cementing body sample with a smaller cementing body size is prepared using a high-performance self-compacting slurry. The spherical particles are high-alumina ceramic balls with a particle size of 50 mm; the length, width and height of the formed loading platform are 60 mm×60 mm×40 mm; the cementitious material is a high-performance self-compacting cement slurry, the cement slurry water-cement volume ratio is 1, and the cement slurry expansion is 220 mm; the second hole 223 of the forming plate 220 in the cement preparation assembly is a circular hole with a diameter of 15 mm and a thickness of 8 mm, and the cementing body formed after casting is a cylindrical structure with a diameter of 15 mm and a thickness of 8 mm.

[0067] Example 3

[0068] In this embodiment, a structured cementitious granular material cementitious body sample with a larger cementitious body size is prepared using high-performance self-compacting mortar. The spherical particles are granite balls with a particle size of 60 mm; the length, width and height of the formed loading platform are 80 mm × 80 mm × 35 mm; the cementitious material is a high-performance self-compacting cement mortar, and the mortar expansion is 250 mm; the second hole 223 of the forming plate 220 in the cementitious body preparation assembly is a circular hole with a diameter of 35 mm and a thickness of 15 mm, and the cementitious body formed after casting is a cylindrical structure with a diameter of 35 mm and a thickness of 15 mm.

[0069] The cast cemented body specimens of Examples 1, 2, and 3 were placed in a standard curing room for curing for 28 days, and then placed on a uniaxial compression testing machine for loading. The uniaxial compressive strength and peak displacement were finally measured as shown in Table 1. Combined with the numerical simulation method, this can lay a foundation for the study of the constitutive model and mechanism of structured cemented granular materials.

[0070] Table 1 Uniaxial compression test results

[0071] Uniaxial compressive strength(kN) Peak displacement(mm) Example 1 90 0.3 Example 2 60 0.1 Example 3 80 0.25

[0072] In the description of the present application, it should be understood that the terms "thickness", "up", "down", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms must be directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0074] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A device for preparing a sample of a structured cemented granular material, characterized in that: include: A single particle loading platform preparation component is used to prepare a single particle loading platform, the single particle loading platform comprises a loading platform and a single particle arranged at the center of the loading platform, the single particle is used to simulate the aggregate in the cementitious body, and the loading platform is convenient for testing the prepared cementitious body sample; A cement body sample preparation component, used for aligning the first single particle loading platform and the second single particle loading platform prepared by the single particle loading platform preparation component, and filling a cementing material between the first single particle of the first single particle loading platform and the second single particle of the second single particle loading platform, and after the cementing material is cured, it forms a cement body sample together with the first single particle loading platform and the second single particle loading platform; The cement body sample preparation assembly includes a positioning rail, and a first positioning plate, a forming plate, and a second positioning plate that pass through the positioning rail and are centrally arranged in sequence, the first positioning plate is used to fix and move the first single particle loading platform, the second positioning plate is used to fix and move the second single particle loading platform, and the forming plate is used to cast a cementing material between the first single particle and the second single particle and then form a cement body; A first hole for the positioning guide rail to pass through is respectively provided at the corner of the molding plate, and a first positioning piece is also respectively provided at the corner of the molding plate for adjusting the position of the molding plate on the positioning guide rail. A second hole is provided at the center of the molding plate, and a space for accommodating the bonding material of the bonding body is formed between the second hole, the first single particle and the second single particle. The size of the second hole should ensure that the first single particle, the second single particle and the bonding material can be bonded and formed.

2. The device for preparing a cement sample according to claim 1, characterized in that: The single particle loading platform preparation component includes an open mold and a centering component, wherein the centering component includes a slot hole arranged at the center of the bottom plate of the open mold and a gasket matching the slot hole; the single particle is placed on the centering component in the open mold, and a bonding material is poured in the space formed between the single particle and the open mold to form the loading platform.

3. The device for preparing a cement sample according to claim 2, characterized in that: The height of the side plate of the opening mold is 50% to 60% of the diameter of the single particle.

4. The device for preparing a cement sample according to claim 1, characterized in that: The diameter of the second hole is 25% to 100% of the diameter of the single particle.

5. The cement sample preparation device according to claim 4, characterized in that: The cross-sectional shape of the second hole includes a circle, an ellipse and a polygon.

6. The device for preparing a cement sample according to claim 1, characterized in that: The forming plate is a split plate, and matching first protrusions and first grooves are respectively arranged on the split parts. The cross-sectional shapes of the first protrusions and first grooves are triangular, square or semicircular.

7. The device for preparing a cement sample according to claim 1, characterized in that: The first positioning plate and the second positioning plate have the same structure. A third hole for the positioning guide rail to pass through is respectively provided at the corner of the positioning plate. A second positioning piece is also respectively provided at the corner of the positioning plate for adjusting the position of the positioning plate on the positioning guide rail. A fourth hole matching the size of the loading platform is formed in the middle of the positioning plate. A support for placing the loading platform is provided in the fourth hole. The support cooperates with the third positioning piece provided on the positioning plate to fix the single particle loading platform.

8. The cement sample preparation device according to claim 7, characterized in that: The positioning plate is a split plate, and matching second protrusions and second grooves are respectively arranged on the split parts. The shapes of the second protrusions and second grooves are triangular, square or semicircular.

9. The device for preparing a cement sample according to claim 1, characterized in that: The bonding material is self-compacting cement paste, self-compacting cement mortar, self-compacting concrete, gypsum, epoxy resin, marble glue or glass glue.

10. The device for preparing a cement sample according to claim 1, characterized in that: The single particle is a sphere or a non-sphere.

11. A method for preparing a colloid sample based on the colloid sample preparation device according to any one of claims 1 to 10, characterized in that: include: S1, using the single particle loading platform preparation assembly to prepare a first single particle loading platform and a second single particle loading platform; S2, assembling the first single particle loading platform and the first positioning plate into a first structure, assembling the first structure on the positioning rail and fixing it; assembling the forming plate on the positioning rail close to the first single particle, moving the forming plate along the positioning rail in a direction close to the first structure until the forming plate can no longer be moved, fixing the forming plate to the positioning rail, and applying a leak-proof agent at the joint between the first single particle and the forming plate; assembling the second single particle loading platform and the second positioning plate into a second structure in a manner that the second single particle faces upward, assembling the second structure on the positioning rail after being turned upside down and fixing it, and the first structure and the second structure are located on both sides of the forming plate; S3, injecting a gelling material into the molding plate from a side of the molding plate close to the second structure; moving the second structure along the positioning guide rail toward the molding plate until the second structure cannot be moved any further, and then fixing the second positioning plate to the positioning guide rail; S4. Clean the excess gelling material overflowing from the side of the forming plate close to the second structure, remove the first positioning plate, the forming plate and the second positioning plate after the gelling material is solidified, and perform curing on the obtained sample to obtain the cemented body sample.

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