CN117430391A - Prestressed fiber woven mesh reinforced super-early-strength high-performance cement-based composite material and preparation method thereof - Google Patents
Prestressed fiber woven mesh reinforced super-early-strength high-performance cement-based composite material and preparation method thereof Download PDFInfo
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- CN117430391A CN117430391A CN202311383361.4A CN202311383361A CN117430391A CN 117430391 A CN117430391 A CN 117430391A CN 202311383361 A CN202311383361 A CN 202311383361A CN 117430391 A CN117430391 A CN 117430391A
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- 239000000835 fiber Substances 0.000 title claims abstract description 174
- 239000002131 composite material Substances 0.000 title claims abstract description 137
- 239000004568 cement Substances 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title claims abstract description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000003822 epoxy resin Substances 0.000 claims abstract description 48
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 48
- 239000011083 cement mortar Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 38
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 28
- 239000004917 carbon fiber Substances 0.000 claims abstract description 28
- 239000006004 Quartz sand Substances 0.000 claims abstract description 24
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000011049 filling Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 239000010881 fly ash Substances 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 21
- 239000011521 glass Substances 0.000 claims description 18
- 239000011324 bead Substances 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 14
- 210000003518 stress fiber Anatomy 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 10
- 239000011398 Portland cement Substances 0.000 claims description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000011863 silicon-based powder Substances 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- 238000013329 compounding Methods 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 6
- 239000002985 plastic film Substances 0.000 claims description 6
- 229920006255 plastic film Polymers 0.000 claims description 6
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- 239000002518 antifoaming agent Substances 0.000 claims description 3
- 239000004760 aramid Substances 0.000 claims description 3
- 229920006231 aramid fiber Polymers 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 abstract description 78
- 239000011159 matrix material Substances 0.000 abstract description 35
- 238000012423 maintenance Methods 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 238000009417 prefabrication Methods 0.000 abstract description 2
- 239000011209 textile-reinforced concrete Substances 0.000 description 21
- 230000008569 process Effects 0.000 description 17
- 239000003638 chemical reducing agent Substances 0.000 description 11
- 238000005056 compaction Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000005488 sandblasting Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 239000004567 concrete Substances 0.000 description 9
- 239000002253 acid Substances 0.000 description 8
- 239000003469 silicate cement Substances 0.000 description 8
- 239000000377 silicon dioxide Substances 0.000 description 8
- 238000002156 mixing Methods 0.000 description 7
- 230000003014 reinforcing effect Effects 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 239000013530 defoamer Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 6
- 238000011282 treatment Methods 0.000 description 6
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
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- 239000011148 porous material Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
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- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
The invention discloses a prestress fiber woven mesh reinforced super-early-strength high-performance cement-based composite material and a preparation method thereof, wherein the scheme comprises the steps of firstly, pre-tensioning carbon fiber tows of a fiber woven mesh, and fully impregnating the fiber tows with epoxy resin; then, uniformly throwing quartz sand on the surface of the fiber tows when the epoxy resin is not cured; and finally, fixing the pre-tensioned fiber woven mesh after the epoxy resin is cured in a mold, rapidly pouring the stirred super-early-strength high-performance cement mortar into the mold, filling the mold, trowelling, and then standing and curing to obtain the pre-tensioned fiber woven mesh reinforced super-early-strength high-performance cement-based composite material. The method can improve the early mechanical property of the composite mortar, improve the overall stress performance and stress path of the fiber tows in the TRC, improve the interface bonding characteristic of the fiber tows and a mortar matrix, and obtain the low-carbon and low-energy TRC component with high strength, good toughness, strong crack control capability, high prefabrication efficiency and simple maintenance condition.
Description
Technical Field
The invention belongs to the field of assembly type building materials, and particularly relates to a scheme of prestressed continuous fiber reinforced super-early-strength high-performance composite mortar.
Background
The assembled building has the advantages of high construction speed, stable construction quality, manpower resource saving and the like, and has become an important trend in the current building industry. Currently, the global fabricated building market is expanding, and due to the acceleration of population growth and urban processes, the building industry is increasingly in need of energy-saving, environment-friendly and efficient building in the face of more complex and changeable environments, and the fabricated building is increasingly valued and popularized as a building form with sustainable, efficient, economic and environment-friendly characteristics.
Fabricated building technology also faces challenges and problems, and fabricated buildings require higher levels of design and engineering techniques to ensure structural stability, durability, and safety than traditional construction. The application of new materials and the innovation of process technology will also bring opportunities for the development of fabricated buildings. TRC (Textile Reinforced Concrete) as a novel composite material has the advantages of light weight, high strength, high durability, high crack resistance and the like, and the application of TRC can (1) improve the safety and reliability of a building structure: the TRC is used as a high-performance composite material, has higher strength and toughness, can improve the anti-seismic performance and bearing capacity of the building structure, and improves the safety and reliability of the building structure; (2) the durability of the building structure is improved: the TRC can reduce the conditions of cracking and cracking of the concrete surface and reduce the damage of harmful substances to the inside of the structure, thereby prolonging the service life of the building structure and reducing the repair and maintenance cost; meanwhile, the waterproof, fireproof and weather-resistant performances are good, the building outer wall can be effectively protected, prolonging the service life of the building (3) and improving the aesthetic property and the artistic quality of the building structure: the TRC plate can also be used as an outer wall decoration material, can be used for manufacturing building facades, decoration members and the like, improves the aesthetic property and the artistic property of a building structure, and ensures that the building has more artistic value and ornamental value.
However, there are still some problems in the preparation process of TRC, mainly focusing on the following points:
(1) in the preparation of TRC, a woven fiber mesh is used to reinforce concrete; however, due to the gaps between the fibres and the inability to tension them during the laying process, the reinforcing effect of the fabric in the concrete may be limited, which may affect the mechanical properties of the TRC;
(2) the cement matrix has insufficient strength and insufficient mechanical property; the cement matrix of the TRC is the main part that carries the load. However, during the TRC preparation process, the overall mechanical properties of the TRC may be insufficient due to insufficient strength of the cement matrix. Therefore, how to improve the strength of the cement matrix during the TRC preparation process is one of the problems to be solved;
(3) the problem of synergy between the fibers and the cement matrix, which is critical to the mechanical properties of the TRC; however, in the process of preparing the TRC, the cement matrix can only be bonded with the filaments on the surface of the fiber bundle, and when the fiber bundle is stressed, the load is mainly borne by the surface fibers, so that the surface filaments are easily broken, the reinforcing effect of the fiber woven mesh cannot be fully exerted, and meanwhile, the crack width is easily caused to be too large. Therefore, optimizing the synergy between the fibers and the cement matrix is also one of the problems to be solved;
(4) in the existing TRC preparation process, most of the cement mortar with half thickness is poured firstly, then the fiber woven net is paved, and then the cement mortar with the other half thickness is poured, and the concrete needs to be poured and vibrated simultaneously, so that the process is complex, and the preparation efficiency is low;
(5) more importantly, the preparation of prefabricated parts in the existing prefabricated part factories mostly requires high-temperature steam curing to shorten the curing period of the prefabricated parts and improve the curing efficiency of the prefabricated parts, so that the TRC production process applied to the assembled parts has larger energy consumption.
Disclosure of Invention
Aiming at the problems existing in the assembly type application process of the prior TRC material, the invention aims to provide the pre-stress fiber woven mesh reinforced super-early-strength high-performance cement-based composite material and also provides the preparation method of the composite mortar.
In order to achieve the aim, the pre-stress fiber woven mesh reinforced super-early-strength high-performance cement-based composite material provided by the invention comprises a fiber woven mesh and super-early-strength high-performance cement mortar poured on the fiber woven mesh;
the fiber woven mesh is fully impregnated with high-permeability epoxy resin in a tensioning state, and the fiber woven mesh is modified based on the high-permeability epoxy resin adhesion fine sand;
the super early strength high performance cement mortar comprises the following components in parts by weight:
in some examples of the invention, the woven fiber mesh is woven from one or more continuous fibers of glass fibers, carbon fibers, basalt fibers, aramid fibers, and the like.
In some examples of the invention, the composite cementitious material is formed by compounding early strength quick hardening cement and ordinary portland cement in a certain proportion.
In order to achieve the above purpose, the preparation method of the prestressed fiber woven mesh reinforced super-early-strength high-performance cement-based composite material provided by the invention comprises the following steps:
(1) Pre-tensioning fiber tows of the fiber woven mesh, and fully coating the fiber tows in a tensioned state by adopting high-permeability epoxy resin, so that the fiber tows are fully impregnated with the epoxy resin;
(2) Fully impregnating high-permeability epoxy resin with fiber tows in a fiber woven mesh, uniformly throwing quartz sand on the surface of the fiber tows when the epoxy resin is not cured, modifying fiber woven mesh fiber tow interfaces, and standing after throwing until the epoxy resin is thoroughly cured;
(3) And fixing the pre-tensioned fiber woven mesh after the epoxy resin is cured in a mold, quickly pouring the stirred super-early-strength high-performance cement mortar into the mold, filling the mold, trowelling, covering the surface with a plastic film, standing for 1-3h, removing the mold, and transferring into a standard curing room for curing for 25-30 days to obtain the pre-tensioned fiber woven mesh reinforced super-early-strength high-performance cement-based composite material.
In some examples of the present invention, when the carbon fiber woven mesh is stretched in the step (1), stretching the longitudinal carbon fibers in the carbon fiber woven mesh first, and stopping stretching and maintaining the stretched state when the tension reaches 20% -25% of the bearing capacity of the carbon fiber woven mesh; and then stretching the transverse carbon fibers in the carbon fiber woven net, and fixing the stretching state.
In some examples of the invention, the preparation method further comprises a preparation step of super early strength high performance cement mortar, comprising:
firstly, adding a composite cementing material, active silicon powder, glass beads, fly ash, quartz sand and an expanding agent into a stirrer according to a proportion, and stirring for 1-2 min to uniformly mix the powder;
then adding water into a stirrer according to a proportion, and slowly stirring for 30-60 s;
and then adding and subtracting the water agent and the defoaming agent according to the proportion, and rapidly stirring for 2-3 min to fully and uniformly mix the slurry, thereby obtaining the super-early-strength high-performance cement mortar.
In some examples of the invention, the composite cementitious material is formed by compounding early strength quick hardening cement and ordinary portland cement in a certain proportion.
Compared with the prior art, the invention has the following beneficial effects:
(1) The cementing system of the composite cement mortar matrix adopted in the scheme provided by the invention is preferably obtained by compounding rapid hardening 52.5 sulphoaluminate cement and P.O.52.5 ordinary silicate cement according to a proper proportion, so that the early strength of the composite mortar is higher. Further, by adding mineral admixture such as active silica powder and the like and utilizing the filling effect and the pozzolan effect, the compactness of a mortar matrix is further improved, and the mechanical property of the composite mortar is further improved, so that the 2h strength of the formed composite mortar can reach more than 20MPa, the 24h strength can reach more than 60MPa, and the 28d compressive strength exceeds 100MPa.
On the other hand, the scheme ensures that the composite mortar has better fluidity and expansibility by adding a proper amount of water reducer into the composite cement mortar system; further, a proper amount of glass beads and class I fly ash are doped, the ball effect of the glass beads and the class I fly ash is utilized, the fluidity of the composite mortar is further improved, and the working performance of the composite mortar is improved, so that the fluidity of the composite mortar after being stirred out of a machine exceeds 300mm, and the fluidity of the composite mortar after being stirred out of the machine can be still kept above 260mm.
The improvement of early strength and fluidity of the composite mortar is realized based on the organic cooperation of the two aspects, so that when the formed super early strength high performance cement mortar is applied to a prefabricated part scene, compared with the traditional prefabricated part, the high temperature steam curing is needed, the special curing condition is not needed in the composite mortar system formed by the scheme (namely, the composite mortar formed by the scheme is based on the super early strength high performance, the high temperature steam curing is not needed, the high early strength can be quickly achieved through normal temperature curing), one-time pouring molding is not needed, layered pouring is not needed, the vibration is not needed, the preparation efficiency of the prefabricated part is high, and the production energy consumption is low.
(2) In the scheme provided by the invention, the fiber woven net is further pretensioned, so that the fiber woven net has a direct force transmission path along the length direction of the fiber tows, and the force transmission mode is simple and clear; after the pouring, forming, demolding and releasing, the compression of the fiber tows on the composite mortar matrix improves the cracking resistance of the composite mortar matrix; simultaneously, the fiber tows are impregnated with high-permeability epoxy resin, and the overall stress and the cooperative working performance of the fiber tows are greatly enhanced after the fiber tows are solidified; meanwhile, quartz sand is uniformly spread on the surface of the fiber tows, so that the interface roughness of the fiber tows is increased, the interface bonding performance of the fiber tows and a composite mortar matrix is enhanced, the cooperative working performance of the fiber tows and the composite mortar is improved, and the reinforcing and toughening effects of the fiber woven net on the composite mortar are further enhanced.
Drawings
The invention is further described below with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of a fiber woven mesh tensioning mold in accordance with an embodiment of the present invention;
FIG. 2 is a flow chart of the preparation of the ultra-early strength high performance composite cement mortar in the example of the invention;
FIG. 3 is a schematic illustration of a sheet bending test method in an example of the invention.
Detailed Description
The invention is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the invention easy to understand.
Through intensive research on the problems existing in the prior art that the fiber woven mesh reinforced cement mortar (TRC) is adopted, the following problems are found: (1) the early strength of the cement composite mortar matrix is low, so that the die can be disassembled after 24 hours, and the production efficiency is low for factory prefabrication production in the practical application process; if the preparation efficiency is to be improved, the energy consumption is increased by means of high-temperature steam curing and the like; (2) the working performance of the cement composite mortar matrix is poor, so that the cement composite mortar matrix needs to be compacted by vibrating through a vibrating table in the forming process of the existing scheme, the energy consumption in the preparation process is high, and the efficiency is low; meanwhile, for larger test pieces or components, the size of a common vibrating table can not meet the vibrating requirement; (3) the method for laying the fiber woven mesh comprises the steps of firstly pouring cement composite mortar with half thickness, then laying the fiber woven mesh, and finally pouring cement composite mortar with the other half thickness; based on the laying mode of the fiber woven mesh in the prior art, the fiber woven mesh is easy to be incapable of tensioning, fiber tows are bent or unevenly distributed, and the reinforcing efficiency of the fiber woven mesh is influenced; meanwhile, based on the laying mode of the fiber woven mesh in the existing scheme, the interface treatment cannot be carried out on the fiber woven mesh tows, so that the reinforcing efficiency of the fiber woven mesh is limited; (4) further, for larger test pieces or components, the area of the used fiber woven net is larger, fiber tows are more, after the cement composite mortar with the first half thickness is poured, the process of laying the fiber woven net and tensioning the fiber woven net is longer, the time interval between the pouring process of the cement mortar with the second half and the pouring process of the cement mortar with the first half is easy to cause, or interlayer cold joints are caused, and the mechanical property and the durability of the fiber woven net are adversely affected.
Based on the scheme, the inventor innovatively provides a scheme of a pre-stress fiber woven mesh reinforced super-early-strength high-performance cement-based composite material, wherein a pre-tensioning method is selected in advance to apply proper pre-stress to the whole fiber woven mesh, and the fiber woven mesh is innovatively fixed on a die, so that the fiber woven mesh maintains good linearity in the transverse and longitudinal directions, and fiber tows are uniformly distributed, the force transmission route of each fiber tow in the fiber woven mesh is improved, namely the stress path of the fiber tows is improved; on the basis, proper prestress is applied to the whole fiber woven mesh to realize synchronous tensioning of the whole fiber woven mesh, so that the fiber tensioning effect and tensioning timeliness are also easy to ensure for a plate-shaped test piece or member with larger area;
on the basis, aiming at the integrally stretched fiber woven net, each fiber tow is fully coated by high-permeability epoxy resin, so that each fiber tow in a stretched state is fully impregnated with the epoxy resin, thereby forming an integral of inner and outer fiber monofilaments of the fiber tow, improving the integral synergistic stress performance of the fiber tow, and improving the integral stress performance of the fiber tow in the fiber tow after the epoxy resin is cured;
further, aiming at the fiber tows which are in a tension state and fully impregnated with the high-permeability epoxy resin, when the epoxy resin is not cured, fine sand is thrown to the surfaces of the fiber tows, so that the fine sand is uniformly attached to the surfaces of the fiber tows, the roughness of the surfaces of each fiber tow is increased, the interfacial bonding performance between the fiber tows and a cement-based composite material substrate is improved, and the cooperative stress performance between the fiber woven net tows and cement composite mortar is improved.
In cooperation with the method, the scheme of the invention synchronously optimizes the mixing ratio of the cement composite mortar, prepares self-leveling and self-compacting cement composite mortar with good workability, can be compacted without additional vibration in the process of preparing test pieces or components, and has good molding surface flatness; meanwhile, due to the self-compaction characteristic of the cement composite mortar, layered and repeated pouring is not needed, and the preparation efficiency is remarkably improved; in addition, even if the fiber woven mesh is not impregnated with high-permeability epoxy resin, the good workability of the mortar is beneficial to the impregnation and wrapping of the fiber yarns in the fiber tows by the cement mortar, and is beneficial to improving the integrity of the fiber tows and enhancing the reinforcing efficiency of the fiber woven mesh; meanwhile, a mortar matrix with super early strength performance is prepared by optimizing the mixing ratio of the cement composite mortar, so that the TRC can be subjected to form removal and maintenance after pouring and forming for about 2 hours, the form removal time is shortened, the preparation efficiency is further improved, and maintenance modes such as high-temperature steam curing and the like are not required to be additionally adopted.
Based on the scheme, the invention provides a preparation method of the pre-stress fiber woven mesh reinforced super-early-strength high-performance cement-based composite material, which specifically comprises the three steps of fiber woven mesh preparation, super-early-strength high-performance cement mortar preparation in step (1), and pre-stress fiber woven mesh reinforced super-early-strength high-performance cement-based composite material preparation in step (3).
The preparation of the fiber woven mesh in the step (1) specifically comprises tensioning of the fiber woven mesh, high-permeability epoxy resin impregnation and uniform surface casting of quartz sand.
(1.1) manufacturing a prefabricated mold: the prefabricated mold is shown in fig. 1, and the prefabricated mold in the scheme is detachably assembled and mainly comprises a bottom mold 1, four side molds 2, a counter-force module 3 fixed on the bottom mold and used for applying prestress, and a tensioning screw 4, wherein bolt holes 5 are drilled in the side molds, and the lower half part 2-1 and the upper half part 2-2 of the side molds 2 can be fixed through bolts 7; the transverse side die is drilled with mounting holes of the longitudinal fiber tensioning clamps 8, so that the longitudinal fiber tensioning clamps 8 are symmetrically mounted at two ends of the side die 2; the tensioning screw 4 is mainly formed by matching a nut 4-1, a screw 4-2 and a pressure sensor 4-3 arranged in the nut 4-1; the tensioning screw 4 with the structure can be screwed into the transverse side die and is connected with the counter-force module 3 in a matched mode, so that tensioning force on carbon fiber tows can be applied through the counter-force module 3 when the transverse side die is screwed into the transverse side die, and the tensioning stress is monitored through the pressure sensor 4-3.
(1.2) tensioning the fiber tows: the longitudinal carbon fiber tows of the fiber woven net 9 pass through tensioning clamps 8 at two ends of the prefabricating die, bolts 7 are primarily screwed up to fix the clamps between the transverse lower side die and the transverse lower side die, and the clamps are primarily straightened; the tensioning screw rod passes through a counter-force module fixed on the bottom die, and the transverse side die 6 is screwed in through the tensioning screw rod 4, so that the transverse side die 6 continuously approaches the counter-force module 3 to apply tensioning force to the longitudinal fiber tows 9. When the pressure value monitored by the pressure sensor 4-3 reaches 2kN (about 20% -25% of the carrying capacity of the carbon fiber woven net), the stretching force is enough to sufficiently straighten the longitudinally stressed fibers of the fiber woven net, stopping stretching the stretching screw rod to stretch and screw in and tightly screwing the fixing bolt 7, and fixing the fixing bolt on the bottom die; finally, the transverse fiber tows of the fiber woven net are manually straightened and tensioned, and are fixed on the longitudinal side dies by tightening the fixing bolts.
(1.3) impregnating the fiber tows with epoxy resin: fully impregnating fiber tows in a tensioned state in a vacuum bag by adopting high-permeability epoxy resin 10 in a prefabricated mould, wherein the specific steps are (1) uniformly mixing the epoxy resin and a curing agent, and then properly preheating to reduce the viscosity of the mixture so as to enable the mixture to be easier to impregnate; (2) placing the carbon fiber woven mesh in a mold, uniformly coating the preheated epoxy resin mixture on the carbon fiber woven mesh, and ensuring full impregnation; (3) placing the immersed woven mesh into a vacuum table or a vacuum bag, starting a vacuum pump, and creating a negative pressure environment. Under vacuum conditions, the resin 10 is better impregnated and filled into the carbon fiber woven mesh 9, removing bubbles and voids, see fig. 1c. (4) Controlling the temperature and time according to the curing curve of the epoxy resin and the characteristics of the curing agent to fully cure the epoxy resin; (5) and taking the cured composite material out of the die, and carrying out necessary trimming and subsequent treatment. The fiber tows are fully impregnated with the epoxy resin through the steps, and the overall stress performance of the fiber tows in the fiber tows can be improved after the epoxy resin is solidified.
(1.4) modification of fiber strand interfaces of the fiber woven mesh: sand blasting equipment including a sand blasting gun, sand, compressed air, a sand blasting chamber, and the like is prepared in advance. After the epoxy resin on the surface of the fiber woven mesh is fully solidified, fine sand with the grain diameter within the range of 0.5-1 mm is selected, and the pressure and the sand blasting angle of a sand blasting gun are adjusted so as to ensure that sand materials can be uniformly sprayed on the surface of the fiber woven mesh and increase mechanical adhesion. And placing the TRC carbon fiber composite material in a sand blasting chamber, and uniformly spraying sand materials on the surface of the fiber woven mesh by using a sand blasting gun to ensure uniform sand grain distribution on the whole surface. And cleaning the surface after sand blasting to remove redundant sand materials and dust.
Further, the fiber woven mesh aimed at in the step is specifically a fiber woven mesh woven by one or more continuous fibers such as glass fibers, carbon fibers, basalt fibers, aramid fibers and the like, and the mesh size is adjusted according to the needs.
Further, the fine sand adopted in the step is preferably 20-40 mesh quartz sand, and the fine sand is uniformly thrown and then stands still for the epoxy resin to be thoroughly cured.
The scheme of the invention is characterized in that when the super early strength high performance cement mortar is prepared in the step (2), the super early strength high performance cement mortar is formed by the following components in parts by weight:
according to the components, the preparation of the super early strength high performance cement mortar is completed by the following procedures, see fig. 2:
firstly, adding 800-1000 parts of composite cementing material, 60-120 parts of active silicon powder, 60-120 parts of glass beads, 30-90 parts of fly ash, 600-900 parts of quartz sand and 2-4 parts of expanding agent into a stirrer to stir for 1-2 min, so that the powder is uniformly mixed;
then, 180-210 parts of water is weighed and added into a stirrer to be stirred slowly for 30-60 s;
then, adding 20-40 parts of polycarboxylic acid high-efficiency water reducer and 2-4 parts of defoamer, and rapidly stirring for 2-3 min to fully and uniformly mix the slurry, thus obtaining the super early strength self-compaction high-performance cement composite mortar.
In the scheme, the super-early-strength high-performance cement mortar is prepared by sequentially matching the three steps, so that the optimization and control reaction process of material mixing can be effectively realized, and the performance and quality of the prepared composite mortar are further ensured:
(1) through the specific cooperation of the three steps, the component materials are uniformly mixed: the staged addition of the component materials can ensure that the components are fully mixed in the stirring process, and local agglomeration or uneven distribution is avoided, so that the uniformity and stability of the whole mortar are ensured;
(2) through the concrete cooperation of three steps, can effectively reduce gas pocket and defect: by adding materials in stages and adjusting the stirring rate, the defects of air holes and the inside of the mortar can be reduced, and the compactness and durability of the mortar are improved.
In the preparation process, the slow dry mixing means that the rotation speed of the blades of the stirrer is not more than 60r/min and the revolution speed is not more than 30r/min. The high-speed stirring means that the rotation speed of the stirring blade is 300-360r/min and the revolution speed is 150-180r/min.
Based on the stirring mode and the preparation flow of adding component materials in stages, the component materials can be further and evenly mixed: the staged addition of the component materials can ensure that the components are fully mixed in the stirring process, and local agglomeration or uneven distribution is avoided, so that the uniformity and stability of the whole mortar are ensured; meanwhile, by adding materials in stages and matching with the stirring speed, the defects of air holes and the inside of the mortar can be greatly reduced, and the compactness and durability of the mortar are improved.
Further, in the preparation scheme, the composite cementing material consists of 52.5 sulphoaluminate cement: p.o.52.5 Portland cement according to 2:1 to 4: the composite cementing material is prepared by compounding the components according to the proportion, and the characteristic requirements of super early strength and high strength of the composite mortar can be met, so that the maintenance condition is reduced, the component preparation efficiency is improved, and the energy consumption and carbon emission in the production process are reduced.
Further, the active silica powder, glass beads, fly ash and quartz sand adopted in the preparation scheme can be obtained through commercial paths, so that the cost can be effectively controlled.
Furthermore, the fly ash is preferably class I fly ash, the quartz sand is preferably 20-110 mesh continuous graded quartz sand, and the expanding agent is preferably a UEA expanding agent. The I-level fly ash is adopted to improve the workability of the composite mortar and ensure the effective improvement of the later strength of the composite mortar; the UEA expanding agent can effectively control the vertical shrinkage rate of the composite mortar, and avoid shrinkage cracks of the material; the composite mortar has good grading through the effective coordination among the I-level fly ash, the 20-110-mesh continuous grading quartz sand and the UEA expanding agent, and the most compact accumulation is realized.
In the preparation scheme of the super early strength high performance cement mortar, the rapid hardening 52.5 sulphoaluminate cement and the P.O.52.5 ordinary silicate cement are compounded according to a proper proportion to form a cementing system of a composite cement mortar matrix, so that the early strength of the composite mortar is higher; on the basis, by adding mineral admixture such as active silica powder and the like and utilizing the filling effect and the pozzolanic effect, the compactness of a mortar matrix is further improved, and the mechanical property of the composite mortar is further improved, so that the 2h strength of the formed composite mortar can reach more than 20MPa, the 24h strength can reach more than 60MPa, and the 28d compressive strength exceeds 100MPa.
On the basis, by adding a proper amount of water reducer into the composite cement mortar system, the composite mortar is ensured to have better fluidity and expansibility; meanwhile, a proper amount of glass beads and class I fly ash are mixed, the ball effect of the glass beads and the class I fly ash is utilized, the fluidity of the composite mortar is further improved, and the working performance of the composite mortar is improved, so that the fluidity of the composite mortar after being stirred out of a machine exceeds 300mm, and the fluidity of the composite mortar after being stirred out of the machine can be still kept above 260mm.
Therefore, the early strength and the fluidity of the composite mortar are effectively improved, when the composite mortar is applied to a prefabricated part scene, compared with the traditional prefabricated part, the composite mortar needs to be steamed at a high temperature, special curing conditions are not needed, one-time casting molding is not needed, layered casting is not needed, vibration is not needed, the preparation efficiency of the prefabricated part is higher, and the production energy consumption is lower.
When the pre-stress fiber woven mesh reinforced super-early-strength high-performance cement-based composite material is prepared in the step (3), firstly, fixing the pre-tension fiber woven mesh mold frame cured by epoxy resin in the step (1) on a mold bottom plate, and ensuring that the frame is tightly attached to the mold bottom plate and no slurry leakage occurs;
and (2) pouring the mixed composite cement mortar in the step (2) into a mould rapidly, filling the mould, slightly wiping off the excessive composite cement mortar by using a scraper, trowelling, covering the surface with a plastic film, and standing for 2h. And (3) removing the die after 2 hours, carefully moving the die into a standard curing room for curing for 28 days, and obtaining the prestressed fiber woven net reinforced super-early-strength self-compaction high-performance composite mortar.
The composite cement mortar matrix prepared based on the step (2) has good self-leveling and self-compaction characteristics, the fluidity of a stirrer after stirring is finished is more than or equal to 300mm, the fluidity of 30min is more than or equal to 260mm, and the composite cement mortar matrix is poured into a prefabricated mould with a fiber woven mesh stretched, so that no vibration is needed.
Meanwhile, based on excellent cooperative stress performance formed between the composite cement mortar prepared in the step (2) and the prestress fiber woven net prepared in the step (1), the prepared prestress fiber woven net reinforced super early strength high performance cement-based composite material has good early strength, and the 2h compressive strength is more than or equal to 20MPa, and the 24h compressive strength is more than or equal to 60MPa. In addition, the 28-day strength compression strength is more than or equal to 100MPa. So that the mold can be removed 3 hours after molding.
The present invention will be described in detail by way of preferred embodiments, but the present invention includes not only the following embodiments.
The fiber woven mesh, the epoxy resin impregnating adhesive, the raw materials of the cement-based matrix components and the like selected in the examples of the present invention are all purchased commercially without special description.
The fiber woven net adopted in the embodiment of the invention is formed by vertically weaving T300 carbon fibers and alkali-resistant glass fiber tows in a mixed mode, and the size of a carbon fiber grid is 10mm multiplied by 10mm;
in the embodiment of the invention, the super early strength self-compaction high performance is preparedThe cement used in the cement-based matrix comprises quick hardening 52.5 sulphoaluminate cement and P.O.52.5 ordinary silicate cement, and the mineral admixture comprises I-class fly ash, S105 mineral powder and active silica powder, wherein the active silica powder comprises SiO 2 More than or equal to 85 percent, and the specific surface area is more than or equal to 23000m 2 /kg; the quartz sand is 20-110 mesh continuous graded quartz sand; the water reducer is a polycarboxylic acid high-efficiency water reducer, and the water reducing rate is not less than 30%; the swelling agent is a UEA swelling agent.
Example 1
In the embodiment, the preparation method of the prestressed fiber woven mesh reinforced super-early-strength high-performance cement-based composite material specifically comprises the following steps:
(1) and manufacturing a prefabricated mold with the thickness of 400mm multiplied by 100mm multiplied by 10mm, wherein four side strips of the prefabricated mold are detachable and separated from a mold bottom plate. And reserving a pore every 10mm on the four sides of the prefabricated die, attaching fiber tows to anchor the steel plate strip on the outer sides of the four sides of the die, and installing a stress sensor on the tensioning screw.
(2) The fiber woven net tows pass through the pores on the four sides of the prefabricating die and are straightened and anchored on the outer steel plate strip, wherein the T300 carbon fiber tows are arranged along the length direction, and the alkali-resistant glass fiber tows are arranged along the transverse direction. After all fiber tows are anchored on the outer steel plate strip, the distances between the steel plate strip and the four sides of the die are adjusted through tensioning screws, prestress is applied to the fiber tows, and the magnitude of the applied prestress is monitored through a stress sensor. The magnitude of the prestressing force applied to the longitudinal carbon fibers and the transverse glass fibers was 0.2kN.
(3) Impregnating the fiber tows by using epoxy impregnating adhesive, wherein the epoxy resin comprises A, B components according to the following weight percentage of 1:1, uniformly mixing, wherein the component A is epoxy resin and is used for impregnating and curing the fiber woven mesh, the component B is curing agent and reacts with the epoxy resin A to form a crosslinked structure, and the curing speed and performance of the epoxy resin can be adjusted; after being mixed uniformly, the fiber tows are fully coated by a brush, so that the fiber tows are fully impregnated with epoxy resin.
(4) When the fiber tows are fully impregnated with the high-permeability epoxy resin and the epoxy resin is not cured, mechanical sand blasting or manual work is adopted to uniformly throw 20-40 mesh fine sand on the surfaces of the fiber tows, the roughness of the surfaces of the fiber tows is increased after the epoxy resin is fully cured, and the interface bonding performance between the fiber tows and the cement-based composite substrate is improved.
(5) Preparing a super-early-strength self-compaction high-performance cement-based composite material, namely adding 900 parts of composite cementing material, 90 parts of active silicon powder, 60 parts of glass beads, 30 parts of fly ash, 900 parts of quartz sand and 2 parts of expanding agent into a stirrer to stir for 1min, and uniformly mixing the powder; weighing 216 parts of water, adding the water into a stirrer, and slowly stirring for 1min; and then adding 40 parts of polycarboxylic acid high-efficiency water reducer and 2 parts of defoamer, and rapidly stirring for 2min to fully and uniformly mix the slurry to obtain the super early strength self-compaction high-performance cement composite mortar serving as the matrix mortar, and testing the fluidity of the matrix mortar by referring to GB/T80772012 concrete admixture homogeneity test method.
Wherein, the composite cementing material contains 690 parts of 52.5 sulphoaluminate cement and 210 parts of P.O.52.5 ordinary silicate cement; the active silica powder, the glass beads, the fly ash and the quartz sand can be obtained through commercial paths, wherein the fly ash is grade I fly ash, the quartz sand is 20-110 mesh continuous graded quartz sand, and the expanding agent is a UEA expanding agent.
The slow dry mixing refers to the condition that the rotation speed of the blades of the stirrer is not more than 60r/min and the revolution speed is not more than 30r/min. The high-speed stirring means that the rotation speed of the stirring blade is 300-360r/min and the revolution speed is 150-180r/min.
(6) And (3) fixing the pre-tensioned fiber woven mesh mould frame prepared in the steps (1) - (4) on a mould bottom plate, and ensuring that the frame is tightly attached to the mould bottom plate and no slurry leakage occurs. And (3) rapidly pouring the mixed composite cement mortar in the step (5) into a mold, filling the mold, lightly wiping off the excessive composite cement mortar by using a scraper, trowelling, covering the surface with a plastic film, and standing for 2 hours until the composite cement mortar is solidified. And (3) removing the die after 2 hours, carefully moving the die into a standard curing room for curing for 28 days, and obtaining the prestressed fiber woven mesh reinforced super-early-strength high-performance cement-based composite material.
The composite cement mortar matrix has good self-leveling and self-compaction characteristics, and the fluidity of the mixer after the mixing is finished is more than or equal to 300mm and the fluidity of the mixer after 30min is more than or equal to 260mm. The fiber woven mesh is poured into a prefabricated mould which stretches the fiber woven mesh, and no vibration is needed.
And pouring the reserved super early strength cement-based composite mortar into a triple mold with the thickness of 40mm multiplied by 160mm, and measuring the compressive strength of the cement composite mortar matrix for 2h, 24h and 28 d.
Example 2
The pre-stress fiber woven mesh reinforced super-early-strength high-performance cement-based composite material is prepared in the example, and the adopted components are as follows in parts by weight:
900 parts of composite cementing material, 60 parts of active silicon powder, 60 parts of glass beads, 60 parts of fly ash, 900 parts of quartz sand, 2 parts of expanding agent, 40 parts of polycarboxylic acid high-efficiency water reducer, 2 parts of defoamer and 216 parts of water. Wherein the composite cementing material contains 600 parts of 52.5 sulphoaluminate cement and 300 parts of P.O.52.5 ordinary silicate cement;
on this basis, the corresponding cement-based composite material was prepared according to the preparation procedure and method of example 1.
Example 3
The pre-stress fiber woven mesh reinforced super-early-strength high-performance cement-based composite material is prepared in the example, and the adopted components are as follows in parts by weight:
960 parts of composite cementing material, 60 parts of active silicon powder, 90 parts of glass beads, 30 parts of fly ash, 750 parts of quartz sand, 2 parts of expanding agent, 40 parts of polycarboxylic acid high-efficiency water reducer, 2 parts of defoamer and 228 parts of water. Wherein, the composite cementing material contains 690 parts of 52.5 sulphoaluminate cement and 270 parts of P.O.52.5 ordinary silicate cement.
On this basis, the corresponding cement-based composite material was prepared according to the preparation procedure and method of example 1.
Comparative example 1
In this comparative example, the following components were used in parts by weight to prepare the corresponding cement-based composite:
900 parts of P.O.52.5 ordinary Portland cement, 90 parts of active silica powder, 60 parts of glass beads, 30 parts of fly ash, 900 parts of quartz sand, 2 parts of expanding agent, 40 parts of polycarboxylic acid high-efficiency water reducer, 2 parts of defoamer and 216 parts of water.
On the basis, corresponding cement-based composite materials are prepared according to the preparation procedures and methods of the embodiment 1 and the embodiment 2.
In the comparative example, ordinary Portland cement is directly adopted to prepare corresponding cement mortar.
Comparative example 2
In this comparative example, the following components were used in parts by weight to prepare the corresponding cement-based composite:
900 parts of composite cementing material, 90 parts of active silicon powder, 900 parts of quartz sand, 2 parts of expanding agent, 21 parts of polycarboxylic acid high-efficiency water reducer, 2 parts of defoaming agent and 216 parts of water. Wherein, the composite cementing material contains 690 parts of 52.5 sulphoaluminate cement and 210 parts of P.O.52.5 ordinary silicate cement; and pouring and vibrating the test piece in the molding process.
On the basis, corresponding cement-based composite materials are prepared according to the preparation procedures and methods of the embodiment 1 and the embodiment 2.
Comparative example 3
In this example, a conventional mesh-grid processing method is used to prepare a corresponding cement-based composite material, which includes the following steps:
(1) 900 parts of P.O.52.5 ordinary Portland cement, 90 parts of active silica powder, 60 parts of glass beads, 30 parts of fly ash, 900 parts of quartz sand and 2 parts of expanding agent are added into a stirrer to be stirred for 1min, so that the powder is uniformly mixed; weighing 216 parts of water, adding the water into a stirrer, and slowly stirring for 1min; then adding 28 parts of polycarboxylic acid high-efficiency water reducer and 2 parts of defoamer, and rapidly stirring for 2min to fully and uniformly mix the slurry to obtain matrix cement composite mortar, and testing the fluidity of the matrix mortar by referring to GB/T80772012 'concrete admixture homogeneity test method';
(2) manufacturing a 400mm multiplied by 100mm multiplied by 5mm mould, pouring the matrix mortar obtained in the step (1) into the mould, and vibrating while pouring; and (3) laying a carbon-glass composite fiber woven net which is cut in advance but not subjected to other treatments on the carbon-glass composite fiber woven net after finishing, fixing the carbon-glass composite fiber woven net by using a 5mm thick edge strip after tensioning by hand, pouring the other half of matrix mortar, pouring and vibrating to prepare a 400mm multiplied by 100mm multiplied by 10mm slat, trowelling the surface, covering a plastic film, and standing for 2 hours until the plastic film is solidified. After 2 hours, the mold is not removed, and the mold is moved into a standard curing room for curing for 28 days, and the bending performance of the mold is tested;
(3) and pouring the reserved super early strength cement-based composite mortar into a triple mold with the thickness of 40mm multiplied by 160mm, and measuring the compressive strength of the cement composite mortar matrix for 2h, 24h and 28 d.
In order to fully perform performance tests, the present examples and comparative examples, in addition to the fluidity of matrix mortar tested by the method for testing homogeneity of concrete admixture according to GB/T80772012, also measured the compressive strength of matrix mortar 2h, 24h, 28d according to the GB/T50081 2019 standard, and tested the bending properties of a sheet according to the method for testing fiber concrete test method according to CECS13-2009, as shown in FIG. 3.
The results of the specific performance tests are shown in Table 1.
TABLE 1 physical and mechanical Properties of matrix mortars and bending Properties of thin plates
Note that: the "number of cracks" refers to the number of cracks in a pure bent segment, "delta 5 The crack width "means the crack width when the mid-span deflection reaches 5mm
As can be seen from Table 1, the pre-tensioning method-based carbon-glass composite fiber woven mesh reinforced super-early-strength high-performance cement mortar formed by the scheme of the invention adopts the sulphoaluminate cement and the silicate cement to be compounded according to a certain proportion to prepare the composite cementing material, and the composite mortar has the characteristics of super-early strength, self-compaction and self-leveling by adjusting the additive.
Based on the comparison example 1 and the comparison example 3, the prepared composite cementing material does not have early strength characteristics if single ordinary Portland cement is adopted.
Based on comparison example 2, on the basis of adopting the composite cementing material, if the adjustment and optimization are not carried out based on the specific additive components and the proportion given by the scheme of the invention, the prepared composite cementing material has poor fluidity and does not have excellent self-leveling property.
Moreover, compared with comparative examples 1-3, the limit bending load and mid-span deflection of the formed sheet are greatly improved by adopting the fiber woven mesh interface treatment mode provided by the invention, the number of cracks is obviously increased, and the width of the cracks is effectively controlled when the mid-span deflection reaches 5 mm. The strength, the deformation performance and the crack control capability of the fiber woven mesh reinforced cement-based composite mortar are obviously improved, and unexpected excellent effects are realized.
Moreover, compared with comparative example 3, the interface treatment mode of the fiber woven mesh provided by the invention adopts a customized die to apply prestress to tension the fiber woven mesh and performs epoxy resin impregnation and sand blasting treatment on the surface of the fiber woven mesh, while in comparative example 3, the fiber woven mesh is laid in a conventional mode, so that the overall working performance is poor, and the test piece forming process is complex.
Therefore, the pre-stress fiber woven mesh reinforced super-early-strength self-compaction high-performance composite mortar provided by the invention has excellent working performance and early-strength performance, can obviously improve the bending performance and crack control capability of the fiber woven mesh reinforced composite mortar, can effectively improve the reinforcing effect of the fiber woven mesh on the high-performance cement mortar, and effectively reduce the cracking risk in the use process of the product.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The pre-stress fiber woven mesh reinforced super-early-strength high-performance cement-based composite material is characterized by comprising a fiber woven mesh and super-early-strength high-performance cement mortar poured on the fiber woven mesh;
the fiber woven mesh is fully impregnated with high-permeability epoxy resin in a tensioning state, and the fiber woven mesh is modified based on the high-permeability epoxy resin adhesion fine sand;
the super early strength high performance cement mortar comprises the following components in parts by weight:
2. the pre-stressed fiber woven mesh reinforced super-early-strength high-performance cement-based composite material according to claim 1, wherein the fiber woven mesh is woven by one or more continuous fibers of glass fibers, carbon fibers, basalt fibers, aramid fibers and the like.
3. The pre-stress fiber mesh reinforced super early strength high performance cement-based composite material according to claim 1, wherein the composite cementing material is formed by compounding early strength and fast hardening cement and ordinary portland cement according to a certain proportion.
4. The preparation method of the prestressed fiber mesh-grid-reinforced super-early-strength high-performance cement-based composite material is characterized by comprising the following steps of:
(1) Pre-tensioning carbon fiber tows of the fiber woven mesh, and fully coating the fiber tows in a tensioned state by adopting high-permeability epoxy resin, so that the fiber tows are fully impregnated with the epoxy resin;
(2) Fully impregnating high-permeability epoxy resin with fiber tows in a fiber woven mesh, uniformly throwing quartz sand on the surface of the fiber tows when the epoxy resin is not cured, modifying fiber woven mesh fiber tow interfaces, and standing after throwing until the epoxy resin is thoroughly cured;
(3) And fixing the pre-tensioned fiber woven mesh after the epoxy resin is cured in a mold, quickly pouring the stirred super-early-strength high-performance cement mortar into the mold, filling the mold, trowelling, covering the surface with a plastic film, standing for 1-3h, removing the mold, and transferring into a standard curing room for curing for 25-30 days to obtain the pre-tensioned fiber woven mesh reinforced super-early-strength high-performance cement-based composite material.
5. The method for preparing the pre-stress fiber woven mesh reinforced super-early-strength high-performance cement-based composite material according to claim 4, wherein in the step (1), when the carbon fiber woven mesh is stretched, stretching is firstly performed on longitudinal carbon fibers in the carbon fiber woven mesh, and when the tension reaches 20% -25% of the bearing capacity of the carbon fiber woven mesh, stretching is stopped and the stretched state is maintained; and then stretching the transverse carbon fibers in the carbon fiber woven net, and fixing the stretching state.
6. The method for preparing the pre-stress fiber woven mesh reinforced super-early-strength high-performance cement-based composite material according to claim 4, wherein the preparation method further comprises the step of preparing super-early-strength high-performance cement mortar, and the method comprises the following steps:
firstly, adding a composite cementing material, active silicon powder, glass beads, fly ash, quartz sand and an expanding agent into a stirrer according to a proportion, and stirring for 1-2 min to uniformly mix the powder;
then adding water into a stirrer according to a proportion, and slowly stirring for 30-60 s;
and then adding and subtracting the water agent and the defoaming agent according to the proportion, and rapidly stirring for 2-3 min to fully and uniformly mix the slurry, thereby obtaining the super-early-strength high-performance cement mortar.
7. The method for preparing the pre-stress fiber mesh reinforced super early strength high performance cement-based composite material according to claim 6, wherein the composite cementing material is formed by compounding early strength quick hardening cement and ordinary Portland cement according to a certain proportion.
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