High fire resistance UHPC and its preparation process

Abstract

The application discloses a kind of high fire resistance UHPC and its preparation process, one aspect, by the mixing of light component such as pottery sand, the apparent density of concrete is greatly reduced, the purpose of light UHPC is achieved;On the other hand, aluminate cement is used, and fly ash, red brick powder and other materials are used in raw materials, which can effectively increase the fire resistance and corrosion resistance of UHPC;The UHPC forming die includes a plurality of template and a second template, the template is composed of a plurality of template units, the second template is composed of a plurality of second template units, and the base is provided with driving structure for driving each template unit to separate from the surface of UHPC at different time, which can effectively reduce the tensile stress received by UHPC during demolding, effectively protect UHPC, and also can reduce or not use demolding agent to avoid the demolding agent mixed into UHPC slurry and affect the performance of UHPC.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building materials, in particular to a high-fire-resistance UHPC and a preparation process thereof. BACKGROUND

[0002] With the development and construction of the country, the demand for large buildings and long-span bridges is becoming more and more intense, and the requirements for lightweight, high-strength, green and durable civil engineering materials are also becoming higher and higher.

[0003] Ultra-high performance concrete (UHPC) is a kind of concrete with ultra-high performance and strength exceeding 100 MPa designed according to the maximum packing density theory. UHPC has ultra-high strength and performance, and can reduce the material consumption and carbon emissions in the construction field by reducing the structure weight.

[0004] The existing UHPC production steps are generally as follows:

[0005] Step 1, selecting raw materials: the main raw materials include cement, fine sand, ultra-fine powder, steel fiber and chemical admixture;

[0006] Step 2, pretreatment of raw materials;

[0007] Step 3, mixing the raw materials by a mixer;

[0008] Step 4, pouring the mixed material into a mold coated with a lubricant and curing.

[0009] In the existing UHPC production process, the production mold of UHPC needs to be embossed with a release agent on the inner wall to prevent UHPC from being difficult to demold during demolding, especially for large-area UHPC demolding. If demolding is not performed using a release agent, UHPC may be damaged by excessive tensile load during demolding, such as cracking or damage. However, when the mold is coated with an excessive amount of release agent, the slurry for producing UHPC will mix the release agent when poured into the mold, which will reduce the bonding performance of the UHPC slurry and affect the formed UHPC. SUMMARY

[0010] The present application aims to provide a high-fire-resistance UHPC and a preparation process thereof to solve the above technical problems.

[0011] To achieve the above-mentioned purpose, the present application provides the following technical solution: a high-fire-resistance UHPC, characterized by comprising the following components mixed by mass fraction:

[0012] Aluminates cement 45-75 parts;

[0013] Fly ash 15-40 parts;

[0014] Silica fume 10-20 parts;

[0015] Red brick powder 5-10 parts;

[0016] Pottery sand 50-110 parts;

[0017] Expanded vermiculite 8-14 parts;

[0018] Fire-resistant steel fiber 10-20 parts;

[0019] Water 15-25 parts.

[0020] A high fire resistance UHPC preparation process, comprising the following steps:

[0021] S1, pre-wetting treatment is performed on pottery sand to obtain pre-wetted pottery sand;

[0022] S2, uniformly mix aluminate cement, fly ash, silica fume, red brick powder, expanded vermiculite and water reducing agent to obtain a first mixture;

[0023] S3, add the pre-wetted pottery sand to the first mixture and stir uniformly to obtain a second mixture;

[0024] S4, add fire-resistant steel fiber to the second mixture and stir uniformly to obtain a third mixture;

[0025] S5, apply a layer of release agent on the inner wall of the forming mold;

[0026] S6, form the third mixture in the forming mold and perform moisture curing.

[0027] Preferably, the forming mold in step S5 comprises a base, a base frame and a mold plate, the base frame is arranged on the top of the base, the mold plate is arranged in multiple groups and forms a frame structure, a mold cavity for pouring the third mixture is formed in the middle of the frame structure formed by the mold plate, and multiple groups of mold plates are arranged inside the base frame and have the same frame structure as the base frame.

[0028] Each group of mold plates is slidingly arranged inside the base frame and is composed of multiple mold plate units, the base is provided with a driving structure for driving each group of mold plate units to slide and make the UHPC product demold, and the driving structure can drive each group of mold plate units on the same mold plate to separate from the surface of the UHPC product at different times.

[0029] Preferably, the driving structure comprises an outer plate, a plurality of groups of pull rods and a plurality of groups of pull plates, the pull rods are arranged on the side end face of each group of the template units away from the mold cavity, the outer plate is arranged on the top of the base and outside each group of the templates, the outer end of each group of the pull rods away from the corresponding template unit penetrates through the base and the outer plate and is in sliding connection, the lengths of the plurality of groups of the pull rods on the template are different, and the pull plates are arranged on the side end face of the pull rods away from the template.

[0030] Preferably, the driving structure further comprises a plurality of groups of driving plates, the driving plates are arranged on the bottom of the outer plate and are in sliding connection, and the driving plates drive the outer plate to move horizontally by sliding.

[0031] Preferably, the outer plate is provided with a groove, the bottom end of the groove penetrates through the outer plate for the driving plate to be inserted, the top end of the groove is connected with a driving groove, the driving groove extends upwards along the side of the groove away from the base, the two sides of the driving groove are provided with first and second inclined surfaces with the same inclination, the bottom ends of the first and second inclined surfaces are connected with the left and right sides of the top end of the groove, respectively, the top end of the driving plate is provided with a driving part matched with the driving groove, the two sides of the driving part are provided with first and second inclined parts for abutting against the first and second inclined surfaces, respectively, and the push plates are arranged between the outer plate and the base.

[0032] Preferably, the base comprises a lower plate and an upper plate arranged above the lower plate by support, a main plate is arranged between the upper plate and the lower plate, the top end face of the main plate is fixedly connected with the bottom end face of each group of the driving plates, and the top of the lower plate is provided with a hydraulic telescopic cylinder for driving the main plate to move up and down.

[0033] Preferably, the bottom of the mold cavity is provided with a second template, the second template is composed of a plurality of groups of second template units, each group of the second template units is provided with a second pull rod, each group of the second pull rods penetrates through the main plate and is in sliding connection with the main plate, the lengths of each group of the second pull rods are different, and the bottom end of each group of the second pull rods is provided with a second pull plate, and the first inclined surface and the first inclined part are left with a buffer zone when the driving part is located at the top end of the driving groove.

[0034] Preferably, the push plates are arranged between the outer plate and the base, and the distances between the push plates on the plurality of groups of the pull rods corresponding to the same template and the outer plate are the same; the second push plates are arranged between the outer plate and the base, and the distances between the second push plates on the plurality of groups of the second pull rods corresponding to the second template and the main plate are the same.

[0035] Preferably, the outer periphery of the second template is located outside the base, and the upper plate is provided with an opening for the second template to move downwards.

[0036] Compared with the prior art, the present application has the following advantages:

[0037] The high fire resistance UHPC provided by the application can achieve the purpose of light UHPC by adding light components such as ceramic sand, and can effectively increase the fire resistance and corrosion resistance of the UHPC by using aluminate cement and materials such as fly ash and red brick powder in raw materials.

[0038] The forming mold comprises a plurality of groups of templates and a group of second templates, the templates are composed of a plurality of groups of template units, the second templates are composed of a plurality of groups of second template units, and the base is provided with a driving structure for driving each group of template units to be separated from the surface of the UHPC at different times, which can effectively reduce the tensile stress received by the UHPC during demolding, effectively protect the UHPC, and reduce or eliminate the use of demolding agents to avoid the influence of the demolding agents on the performance of the UHPC. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed for the description of the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0040] Figure 1 is a structural schematic diagram of the whole application;

[0041] Figure 2 is a structural schematic diagram of the whole application from a bottom view;

[0042] Figure 3 is a structural schematic diagram of the whole application from a top view;

[0043] Figure 4 is a sectional view of the application highlighting the cooperation of the driving plate and the outer plate.

[0044] In the drawings, the components represented by the respective reference numerals are listed as follows:

[0045] 1, forming mold; 2, base; 21, upper plate; 22, lower plate; 3, base frame; 4, template unit; 5, outer plate; 6, pull rod; 7, pull plate; 8, driving plate; 9, groove; 10, driving groove; 11, first inclined surface; 12, second inclined surface; 13, driving part; 14, main plate; 15, hydraulic telescopic cylinder; 16, second template unit; 17, second pull rod; 18, buffer zone; 19, second push plate; 30, sliding groove; 31, limiting groove; 32, first inclined part; 33, second pull plate. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0047] Please refer to Figures 1-4 The present application provides a technical solution: a high fire resistance UHPC, comprising the following components mixed by mass fraction:

[0048] Aluminates cement 45-75 parts;

[0049] Fly ash 15-40 parts;

[0050] Silica fume 10-20 parts;

[0051] Red brick powder 5-10 parts;

[0052] Pottery sand 50-110 parts;

[0053] Expanded vermiculite 8-14 parts;

[0054] Fire-resistant steel fiber 10-20 parts;

[0055] Water 15-25 parts.

[0056] From the above description, it can be seen that when pottery sand is used as one of the concrete aggregates, the better closest packing density between the aggregates is met, which is more conducive to obtaining ultra-high performance concrete; the use of aluminates cement and materials such as fly ash and red brick powder in the raw materials can effectively increase the fire resistance and corrosion resistance of UHPC.

[0057] The second technical solution provided by the present application is:

[0058] A high fire resistance UHPC preparation process, comprising the following steps:

[0059] S1, pre-wetting treatment is performed on the pottery sand to obtain pre-wetted pottery sand;

[0060] S2, aluminates cement, fly ash, silica fume, red brick powder, expanded vermiculite and water reducing agent are uniformly mixed to obtain a first mixture;

[0061] S3, pre-wetted pottery sand is added to the first mixture and stirred uniformly to obtain a second mixture;

[0062] S4, fire-resistant steel fiber is added to the second mixture and stirred uniformly to obtain a third mixture;

[0063] S5, a layer of release agent is applied on the inner wall of the forming mold 1.

[0064] S6, the third mixture is molded in the molding mold 1, and moisture curing is performed.

[0065] From the above description, it can be seen that the pre-wetting treatment of the ceramic sand can be used as internal curing material to improve the internal humidity of the concrete, provide internal curing for the ultra-high performance concrete with low water-binder ratio and low internal relative humidity, promote the cement hydration reaction, and improve the performance of the concrete.

[0066] Specifically, the molding mold 1 in step S5 includes a base 2, a base frame 3, and a mold plate. The base frame 3 is arranged on the top of the base 2. The mold plate is arranged in multiple groups and forms a frame structure. A mold cavity for pouring the third mixture is formed in the middle of the frame structure formed by the mold plate. The multiple groups of mold plates are arranged inside the base frame 3 and have the same frame structure as the base frame 3.

[0067] Each group of mold plates is slidingly arranged on the inner side of the base frame 3 and is composed of multiple mold plate units 4. The base 2 is provided with a driving structure for driving each group of mold plates to slide and release the UHPC product. The driving structure can drive each group of mold plate units 4 on the same mold plate to be separated from the surface of the UHPC product at different times.

[0068] From the above description, it can be seen that the mold plate is composed of multiple groups of mold plate units 4, and the base 2 is provided with a driving structure for driving each group of mold plate units 4 to be separated from the surface of the UHPC at different times. This can effectively reduce the tensile stress received by the UHPC during demolding, effectively protect the UHPC, and reduce or eliminate the use of demolding agent, thereby avoiding the influence of the demolding agent on the performance of the UHPC.

[0069] Specifically, the driving structure includes an outer plate 5, a pull rod 6, and a pull plate 7. The pull rod 6 is arranged in multiple groups and is correspondingly arranged on the side end face of each group of mold plate units 4 away from the mold cavity. The outer plate 5 is located on the top of the base 2 and on the outer side of the base frame 3 corresponding to each group of mold plates. The outer ends of each group of pull rods 6 away from the corresponding mold plate units 4 penetrate the base frame 3 and the outer plate 5 and are slidingly connected. The lengths of the multiple groups of pull rods 6 on the mold plate are not the same. The pull plate 7 is arranged in multiple groups and is correspondingly arranged on the side end face of the pull rod 6 away from the mold plate.

[0070] From the above description, it can be seen that the lengths of the multiple groups of pull rods 6 on the mold plate are not the same. When the outer plate 5 slides away from the mold cavity, it will contact each group of pull plates 7 at different times, thereby driving each group of pull rods 6 to be separated from the surface of the UHPC during the sliding process of the outer plate 5, thereby avoiding the one-time large-area demolding of the UHPC.

[0071] Specifically, the driving structure further includes a driving plate 8. The driving plate 8 is arranged in multiple groups corresponding to the outer plate 5. The driving plate 8 is slidingly arranged at the bottom of the outer plate 5 and drives the outer plate 5 to move horizontally by sliding. The multiple groups of driving plates 8 are slidingly arranged on the base in an up-down manner.

[0072] From the above description: by driving plate 8 can drive the outer plate 5 to slide away from the side of the cavity, the realization of the outer plate 5 and the pull plate 7.

[0073] Specifically, the outer plate 5 is provided with a groove 9, the bottom end of the groove 9 penetrates the outer plate 5 for the insertion of the driving plate 8, the top end of the groove 9 is provided with a driving groove 10, the driving groove 10 extends along the top of the groove 9 away from the base frame 3 side, the driving groove 10 is provided with the first slope 11 and the second slope 12 with the same slope on both sides, the bottom end of the first slope 11 and the second slope 12 is respectively connected with the left and right sides of the top end of the groove 9, the top end of the driving plate 8 is provided with a driving part 13 matched with the driving groove 10, the driving part 13 is provided with a first inclined part 32 and a second inclined part on both sides for abutting the first slope 11 and the second slope 12, respectively, and each group of pull rod 6 is provided with a push plate between the outer plate 5 and the base frame 3, and the distance between the push plate on the same group of pull rod 6 and the outer plate 5 is the same.

[0074] From the above description: when the driving plate 8 slides down, the first inclined part 32 of the driving part 13 will abut the first slope 11 to drive the outer plate 5 to move outward, and the outer plate 5 will drive the pull plate 7 to move to make each group of mold plate unit 4 realize demolding one by one; when the driving plate 8 moves up, the second inclined part of the driving part 13 will abut the second slope 12, so that the outer plate 5 moves towards the cavity side, so that the mold plate is closed again to fill the UHPC slurry again.

[0075] Specifically, the base 2 includes a lower plate 22 and an upper plate 21 provided above the lower plate 22 by support, a main plate 14 is arranged between the upper plate 21 and the lower plate 22, the top end surface of the main plate 14 is fixedly connected with the bottom end surface of each group of driving plate 8, and the top of the lower plate 22 is provided with a hydraulic telescopic cylinder 15 for driving the main plate 14 to move up and down.

[0076] From the above description: the bottom end of each group of driving plate 8 is fixedly connected with the top end of the main plate 14, and the main plate 14 is driven to move up and down by the hydraulic telescopic cylinder 15, so that each group of driving plate 8 can be driven to move up and down at the same time, so that the outer plate 5 on the side of the mold cavity moves outward at the same time, which realizes the synchronous linkage structure.

[0077] Specifically, the bottom of the mold cavity is provided with a second mold plate, the second mold plate is composed of a plurality of second mold plate units 16, each second mold plate unit 16 is provided with a second pull rod 17, each second pull rod 17 penetrates the main plate 14 and forms a sliding connection with the main plate 14, the length between each group of second pull rod 17 is different, and the bottom end is provided with a second pull plate 33, and the first slope 11 leaves a buffer zone 18 between the first inclined part 32 when the driving part 13 is located at the top end of the driving groove 10.

[0078] From the above description, it can be seen that: by setting the second template, and leaving a buffer zone 18 between the first inclined surface 11 and the first inclined portion 32 when the driving portion 13 is located at the top end of the driving groove 10, the lower part of the UHPC can be demolded in a way that each of the multiple second template units 16 is used one by one, so that the UHPC is better protected during demolding. The buffer zone 18 can make the first inclined portion 32 contact the first inclined surface 11 after the driving plate 8 slides down for a period of time, so that the bottom of the UHPC is demolded first, and then the demolding of the UHPC around the side is performed.

[0079] Specifically, a push plate is arranged between the outer plate 5 and the base frame 3 for each group of pull rods 6, and the distances from the push plates on the multiple groups of pull rods 6 corresponding to the same template to the outer plate 5 are the same. A second push plate 19 is arranged between the outer plate 5 and the base frame 3 for each group of second pull rods 17, and the distances from the second push plates 19 on the multiple groups of second pull rods 17 corresponding to the second template to the main plate 14 are the same.

[0080] From the above description, it can be seen that: when the main plate 14 moves upward through the hydraulic telescopic cylinder 15, the main plate 14 abuts against the multiple push plates, which will drive each of the second template units 16 to move upward and then be located on the same plane again, for the next time UHPC slurry is poured into the mold cavity.

[0081] Specifically, the outer periphery of the second template is located outside the base frame 3, and the upper plate 21 is provided with an opening for the downward movement of the second template.

[0082] From the above description, it can be seen that: the outer periphery of the second template is located outside the base frame 3, so that the slurry between the template and the base frame 3 can be taken out when the second template moves downward, which is convenient for cleaning.

[0083] Referring to Figures 1-4 , an embodiment of the present application is:

[0084] A high-fire-resistant UHPC, characterized in that: it comprises the following components mixed by mass parts:

[0085] Aluminates cement 60 parts;

[0086] Fly ash 30 parts;

[0087] Silica fume 15 parts;

[0088] Red brick powder 8 parts;

[0089] Pottery sand 80 parts;

[0090] Expanded vermiculite 10 parts;

[0091] Fire-resistant steel fiber 15 parts;

[0092] Water 20 parts.

[0093] The ceramic sand has a bulk density of 1000-1400 kg / m3 and is composed of large, medium and small size ceramic sands with sizes of 0.55-1.4 mm, 0.27-0.55 mm and 0.15-0.27 mm, and the weight ratio of the large, medium and small size ceramic sands is 55-60:25-30:15-20.

[0094] A preparation process of high fire resistance UHPC, comprising the following steps:

[0095] S1, pre-wetting the ceramic sand to obtain pre-wetted ceramic sand;

[0096] S2, mixing aluminate cement, fly ash, silica fume, red brick powder, expanded vermiculite and water reducing agent uniformly to obtain a first mixture;

[0097] S3, adding the pre-wetted ceramic sand to the first mixture and stirring uniformly to obtain a second mixture;

[0098] S4, adding fire-resistant steel fibers to the second mixture and stirring uniformly to obtain a third mixture;

[0099] S5, smearing a layer of release agent on the inner wall of the forming mold 1 (this step can be omitted according to the size of the template unit 4 and the release effect of the UHPC. When the number of template units 4 constituting a group of templates is large, the contact surface between each group of template units 4 and the UHPC is small, and the step of smearing release agent can be omitted at this time);

[0100] S6, forming the third mixture in the forming mold 1 and performing moisture curing.

[0101] In this embodiment, the forming mold 1 in step S5 includes a base 2, a base frame 3 and templates, the base frame 3 is arranged on the top of the base 2, the templates are arranged in multiple groups and form a frame structure, a mold cavity for pouring the third mixture is formed in the middle of the frame structure formed by the templates, the multiple groups of templates are arranged inside the base frame 3 and have the same frame structure as the base frame 3, and the base frame 3 has a quadrilateral structure, and the templates arranged in the base frame 3 correspond to four groups.

[0102] Each group of templates is slidingly arranged on the inner side of the base frame 3 and is composed of multiple template units 4, the base 2 is provided with a driving structure for driving each group of templates to slide and release the UHPC product, the driving structure can drive each group of template units 4 on the same template to be separated from the surface of the UHPC product at different times, and under the action of the driving structure, each group of templates will have a group of template units 4 separated from the surface of the UHPC product at the same time at a certain time, so that the release device is more balanced in stress.

[0103] In the embodiment, the driving structure comprises the outer plate 5, the pull rods 6 and the pull plates 7. The pull rods 6 are arranged in multiple groups and correspondingly arranged on the side end faces of each group of the mold plate units 4 away from the mold cavities. The outer plate 5 is located on the top of the base 2 and on the outer side of the base frame 3 corresponding to each group of the mold plates. The outer ends of each group of the pull rods 6 away from the corresponding mold plate units 4 all penetrate the base frame 3 and the outer plate 5 and are all formed in sliding connection. The lengths of the multiple groups of the pull rods 6 on the mold plate are all different. In the embodiment, the lengths of the pull rods 6 gradually increase from one side to the other side, forming a stepped arrangement. The pull plates 7 are arranged in multiple groups and correspondingly arranged on the side end faces of the pull rods 6 away from the mold plate. The end faces between the adjacent pull plates 7 are in close contact with each other, which can be more stable in movement. In the case that the lengths of the pull rods 6 are different, the outer plate 5 will be in contact with each of the pull plates 7 in the process of sliding outward.

[0104] In the embodiment, the driving structure further comprises the driving plates 8. The driving plates 8 are arranged in multiple groups corresponding to the outer plate 5. The driving plates 8 are slidingly arranged on the bottom of the outer plate 5 and drive the outer plate 5 to move horizontally by sliding. The bottom end of the outer plate 5 is in close contact with the top end face of the base 2, which is more stable in the process of sliding. The multiple groups of the driving plates 8 are all slidingly arranged on the base in an up-down manner.

[0105] In the embodiment, the outer plate 5 is provided with a groove 9. The bottom end of the groove 9 penetrates the outer plate 5 for the driving plate 8 to be inserted. The width of the groove 9 is greater than the thickness of the driving plate 8, and the distance of the horizontal displacement of the driving plate 8 in the groove 9 is enough to make the outer plate 5 push all the pull plates 7 outward. The top end of the groove 9 is provided with a driving groove 10. The driving groove 10 extends above the side away from the base frame 3 along the groove 9. The two sides of the driving groove 10 are provided with the first inclined surface 11 and the second inclined surface 12 with the same slope. The bottom ends of the first inclined surface 11 and the second inclined surface 12 are respectively connected with the left and right sides of the top end of the groove 9. The top end of the driving plate 8 is provided with a driving part 13 matched with the driving groove 10. The two sides of the driving part 13 are respectively provided with the first inclined part 32 and the second inclined part 32 for abutting against the first inclined surface 11 and the second inclined surface 12. Each group of the pull rods 6 is provided with a push plate between the outer plate 5 and the base frame 3. When the multiple groups of the mold plate units 4 of the same mold plate are located on the same plane, the push plates of each group are also located on the same plane. The distances from the push plates on the multiple groups of the pull rods 6 corresponding to the same mold plate to the outer plate 5 are all the same.

[0106] Referring to Figures 1-4 Embodiment two of the present application:

[0107] The difference between this embodiment and embodiment one is that the base 2 comprises a lower plate 22 and an upper plate 21 arranged above the lower plate 22 by support, a main plate 14 is arranged between the upper plate 21 and the lower plate 22, the top end surface of the main plate 14 is fixedly connected with the bottom end surface of each group of driving plates 8, the top of the lower plate 22 is provided with a hydraulic telescopic cylinder 15 for driving the main plate 14 to move up and down, the outer end of the output end of the hydraulic telescopic cylinder 15 is fixed with the bottom end surface of the main plate 14, and the up and down movement of the main plate 14 is driven by the extension and retraction of the output end of the hydraulic telescopic cylinder 15.

[0108] In this embodiment, the bottom of the mold cavity is provided with a second mold plate, the second mold plate is composed of a plurality of second mold plate units 16, each second mold plate unit 16 is provided with a second pull rod 17, each second pull rod 17 penetrates through the main plate 14 and forms a sliding connection with the main plate 14, the lengths of each second pull rod 17 are different, and the bottom end of each second pull rod 17 is provided with a second pull plate 33, in this embodiment, the second pull rod 17 gradually increases from one side to the other side to form a stepped arrangement, a plurality of second pull plates 33 are arranged and arranged on the side end surface of the second pull rod 17 away from the second mold plate, the end surfaces between adjacent second pull plates 33 are in close contact with each other, which can be more stable during movement, under the condition that the lengths of the second pull rods 17 are different, the main plate 14 will be in contact with each second pull plate 33 during the outward sliding process; the buffer zone 18 is left between the first inclined surface 11 and the first inclined portion 32 when the driving portion 13 is located at the top end of the driving groove 10, so that the main plate 14 moves downward and drives the second mold plate unit 16 to be demolded through the plurality of second pull rods 17, and then the first inclined portion 32 of the driving portion 13 is in abutment with the first inclined surface 11, so as to drive the four groups of mold plates on the periphery of the mold cavity to be separated from the UHPC (when the four groups of mold plates on the periphery have not been separated from the UHPC, a pre-tightening force will be formed on the periphery of the UHPC, which is convenient for the second mold plate at the bottom to be separated from the UHPC, so the second mold plate at the bottom is demolded first); it should be noted that the top of the base 2 is provided with a sliding groove 30 for the sliding of the outer plate 5, the two sides in the sliding groove 30 are provided with limiting grooves 31, the bottom end of the outer plate 5 is provided with a limiting plate which forms a sliding connection with the limiting groove 31, when the driving plate 8 moves upward and abuts against the second inclined surface 12, the cooperation between the limiting plate and the limiting groove 31 can offset part of the stress of the outer plate 5, so as to avoid that the upward force of the outer plate 5 during the upward movement of the driving plate 8 is all borne by the pull rod 6; it should be further noted that the plurality of second pull rods 17, the second pull plates 33 and the second push plates 19 on the second mold plate are symmetrically arranged in two rows, the hydraulic telescopic cylinder 15 is located between the two rows of pull rod structures, and a plurality of groups can be arranged according to the support requirement.

[0109] In this embodiment, the second push plate 19 is arranged between each group of second pull rods 17 and the outer plate 5 and the base frame 3, the distances from the second push plates 19 on the corresponding plurality of second pull rods 17 of the second mold plate to the main plate 14 are the same.

[0110] In the embodiment, the second template periphery is located outside the base frame 3, and the upper plate 21 is provided with an opening for downward movement of the second template.

[0111] A specific application mode of the present application is: S1, pre-wetting treatment is performed on the ceramic sand to obtain pre-wetting ceramic sand; S2, the aluminate cement, fly ash, silica ash, red brick powder, expanded vermiculite and water reducing agent are uniformly mixed to obtain a first mixture; S3, the pre-wetting ceramic sand is added to the first mixture, and the second mixture is obtained by uniformly stirring; S4, the refractory steel fiber is added to the second mixture, and the third mixture is obtained by uniformly stirring; S5, a layer of release agent is applied on the inner wall of the forming mold 1 (this step can be omitted according to the release condition); S6, the third mixture is placed in the mold cavity of the forming mold 1 and is appropriately vibrated, and the third concrete is maintained and cured during the forming process.

[0112] After the UHPC is formed, the hydraulic telescopic cylinder 15 is started to drive the main plate 14 to move downward, the main plate 14 moves downward and sequentially contacts the second pull plate 33, thereby sequentially pulling the second pull rod 17 downward through the second pull plate 33, so that each group of second template units 16 is separated from the UHPC.

[0113] The main plate 14 continues to move downward, and the main plate 14 continues to move downward and drive each group of drive plates 8 to move downward, and each group of drive plates 8 moves downward and abuts against the first inclined surface 11, thereby driving the outer plate 5 to move away from the mold cavity and sequentially contact the pull plate 7, and each group of pull rods 6 drives the template unit 4 to separate from the UHPC, thereby completing the demolding.

[0114] The main plate 14 continues to move downward, and can drive the UHPC between the upper plate 21 and the lower plate 22, that is, the UHPC can be taken out. After the UHPC is taken out, the hydraulic telescopic cylinder 15 drives the main plate 14 to move upward, the main plate 14 moves upward and drives the drive plate 8 to move upward, the drive plate 8 moves upward and abuts against the second inclined surface 12, and drives each group of outer plates 5 to move towards the mold cavity, and the outer plate 5 moves a distance and contacts each group of push plates and pushes the template unit 4 to the flush state through the pull rod 6, until the driving part 13 at the top end of the drive plate 8 is located at the top end of the driving groove 10, at this time, the main plate 14 stops moving upward, and the second template unit 16 is also pushed to the flush state by the main plate 14, and the bottom end of the second template unit 16 is attached to the bottom end of the template unit 4, so that the template and the second template form a mold cavity with an open top, for pouring of the third mixture next time.

[0115] In the description of the application, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "central", "both ends" and the like indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0116] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screwed" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited, and those skilled in the art can understand the specific meaning of the above-mentioned terms in the present application according to the specific circumstances.

[0117] Although embodiments of the application have been shown and described, those skilled in the art can understand that modifications can be made to these embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A high fire resistant UHPC, characterized in that, Comprise the following components mixed by mass fraction: Aluminate cement 45-75 parts; Fly ash 15-40 parts; Silica fume 10-20 parts; Red brick powder 5-10 parts; Pottery sand 50-110 parts; Expanded vermiculite 8-14 parts; Fire-resistant steel fiber 10-20 parts; Water 15-25 parts; High refractory UHPC preparation process, comprising the following steps: S1, pre-wetting treatment of pottery sand is obtained; S2, aluminate cement, fly ash, silica fume, red brick powder, expanded vermiculite and water reducing agent are mixed uniformly to obtain a first mixture; S3, the pre-wetting pottery sand is added to the first mixture, and the second mixture is obtained by stirring uniformly; S4, the fire-resistant steel fiber is added to the second mixture, and the third mixture is obtained by stirring uniformly; S5, a layer of release agent is applied on the inner wall of the forming mold (1); S6, the third mixture is formed in the forming mold (1), and moisture curing is carried out; The forming mold (1) in step S5 comprises a base (2), a base frame (3) and a template, the base frame (3) is arranged on the top of the base (2), the template is arranged in multiple groups and forms a frame structure, the middle of the frame structure formed by the template is provided with a mold cavity for pouring the third mixture, and multiple groups of the template are arranged inside the base frame (3) and have the same frame structure as the base frame (3); Each group of the template is slidingly arranged on the inner side of the base frame (3) and is composed of multiple groups of template units (4), the base (2) is provided with a driving structure for driving each group of the template to slide to release the UHPC product, and the driving structure can drive each group of the template unit (4) on the same template to be separated from the surface of the UHPC product at different times; The driving structure comprises an outer plate (5), a pull rod (6) and a pull plate (7), the pull rod (6) is arranged in multiple groups and is correspondingly arranged on the side end face of each group of the template unit (4) away from the mold cavity, the outer plate (5) is located on the top of the base (2) and is located on the outer side of the base frame (3) corresponding to each group of the template, the outer end of each group of the pull rod (6) away from the corresponding template unit (4) penetrates the base frame (3) and the outer plate (5) and is slidingly connected, the lengths of the multiple groups of the pull rod (6) on the template are different, and the pull plate (7) is arranged in multiple groups and is correspondingly arranged on the side end face of the pull rod (6) away from the template.

2. The high fire resistance UHPC according to claim 1, characterized in that: The driving structure further comprises a driving plate (8), the driving plate (8) is arranged in multiple groups corresponding to the outer plate (5), the driving plate (8) is slidingly arranged on the bottom of the outer plate (5) and drives the outer plate (5) to move horizontally by sliding, and multiple groups of the driving plate (8) are slidingly arranged on the base in up and down directions.

3. The high fire resistance UHPC of claim 2, wherein: The outer plate (5) is provided with a groove (9), the bottom end of the groove (9) penetrates the outer plate (5) for inserting the driving plate (8), the top end of the groove (9) is provided with a driving groove (10) in communication, the driving groove (10) extends upwards away from the side of the groove (9) away from the base frame (3), the two sides of the driving groove (10) are provided with first and second inclined surfaces (11) and (12) with the same slope, the bottom ends of the first and second inclined surfaces (11) and (12) are respectively connected to the left and right sides of the top end of the groove (9), the top end of the driving plate (8) is provided with a driving part (13) matched with the driving groove (10), and the two sides of the driving part (13) are respectively provided with first and second inclined parts (32) for abutting against the first and second inclined surfaces (11) and (12); each group of pull rods (6) between the outer plate (5) and the base frame (3) is provided with a push plate, and the distances from the push plates on the multiple groups of pull rods (6) corresponding to the same template to the outer plate (5) are the same.

4. The high fire resistance UHPC of claim 3, wherein: The base (2) comprises a lower plate (22) and an upper plate (21) provided above the lower plate (22) by support, a main plate (14) is arranged between the upper plate (21) and the lower plate (22), the top end surface of the main plate (14) is fixedly connected with the bottom end surface of each group of driving plates (8), and the top of the lower plate (22) is provided with a hydraulic telescopic cylinder (15) for driving the main plate (14) to move up and down.

5. The high fire resistance UHPC of claim 4, wherein: The bottom of the mold cavity is provided with a second template, the second template is composed of multiple second template units (16), each second template unit (16) is provided with a second pull rod (17), each second pull rod (17) penetrates the main plate (14) and is in sliding connection with the main plate (14), the lengths of each group of second pull rods (17) are different, and the bottom end of each group of second pull rods (17) is provided with a second push plate (33), and the first inclined surface (11) leaves a buffer zone (18) between the first inclined surface (11) and the first inclined part (32) when the driving part (13) is located at the top end of the driving groove (10).

6. The high fire resistance UHPC of claim 5, wherein: Each group of second pull rods (17) between the outer plate (5) and the base frame (3) is provided with a second push plate (19), and the distances from the second push plates (19) on the multiple groups of second pull rods (17) corresponding to the second template to the main plate (14) are the same.

7. The high fire resistance UHPC of claim 6, wherein: The outer periphery of the second template is located outside the base frame (3), and the upper plate (21) is provided with an opening for the second template to move downwards.

Images