CN108863200B - Cement-based material and fabric concrete for repairing bridge expansion joint, preparation method of cement-based material and fabric concrete and bridge expansion joint repairing method - Google Patents
Cement-based material and fabric concrete for repairing bridge expansion joint, preparation method of cement-based material and fabric concrete and bridge expansion joint repairing method Download PDFInfo
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Classifications
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- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/06—Arrangement, construction or bridging of expansion joints
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
- C04B2111/00672—Pointing or jointing 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
- C04B2111/72—Repairing or restoring existing buildings or building 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
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a cement-based material for repairing a bridge expansion joint, which comprises the following components: 60-75 parts of cement and 25-40 parts of modified material; the modified material comprises the following components: 50-80 parts of reinforcing component, 20-40 parts of coagulation regulating component, 0.5-5 parts of corrosion preventing component and 0.5-5 parts of expansion component. The invention also provides fabric concrete for repairing the bridge expansion joint, a preparation method of the fabric concrete and a bridge expansion joint repairing method. The fabric concrete provided by the invention can be conveniently constructed, can open traffic 0.5-1 h after construction, has the advantages of high strength, high toughness, good durability, easiness in maintenance, flame retardance and the like, can realize no vehicle jumping, low noise and abrasion resistance, simultaneously ensures the driving comfort and safety, is simple and efficient in watering and curing molding construction scheme, and can meet various engineering application requirements.
Description
Technical Field
The invention relates to a cement-based material for repairing a bridge expansion joint, fabric concrete, a preparation method of the fabric concrete and a bridge expansion joint repairing method, and belongs to the technical field of fabric concrete.
Background
Domestic standard bridges are being subjected to ever increasing traffic damage, particularly in the portions of the deck expansion joints that directly bear the repeated loads of the vehicles. Usually, expansion joints are arranged between two beam ends, between the beam ends and the abutment or at the hinged position of the bridge, the damage of the bridge expansion joint not only affects the normal use of the bridge, but also causes adverse social influence, a great deal of experience is accumulated through continuously exploring and researching the bridge expansion joint maintenance technology, and the construction technology gradually becomes mature. However, due to the limitation of factors such as construction technical requirements and repair material technology, the expansion joint repair has the technical problems of high cost, large engineering quantity, poor durability, long construction period and the like, and the bridge expansion joint has more repair procedures and high repair difficulty. At present, the common material used for repairing the domestic expansion joint is ultra-fast hard concrete, and the problems of brittleness and hardness, poor interface bonding, serious secondary damage and the like of common concrete still exist although the open traffic time is relatively short. Therefore, in order to solve the technical problems, the expansion joint repair method meets the technical requirements of simplicity, rapidness and durability, and the research on novel flexible fabric concrete with excellent properties is significant.
Disclosure of Invention
The invention aims to solve the technical problems of high maintenance cost, large engineering quantity, poor durability and long construction period in the prior art, and provides a cement-based material and fabric concrete for repairing a bridge expansion joint, a preparation method thereof and a bridge expansion joint repairing method.
In order to solve the technical problems, the invention adopts the technical scheme that: a cement-based material for repairing a bridge expansion joint, the cement-based material comprising the following components: 60-75 parts of cement and 25-40 parts of modified material; the modified material comprises the following components: 50-80 parts of reinforcing component, 20-40 parts of coagulation regulating component, 0.5-5 parts of corrosion preventing component and 0.5-5 parts of expansion component. In the invention, the reinforcing component is used for adjusting the flexural strength, compressive strength, wear resistance and frost resistance of the cement-based material, the coagulation regulating component is used for adjusting the setting time of the cement-based material, the corrosion preventing component is used for preventing the cement-based material from being corroded, and the expansion component is used for adjusting the expansion performance of the cement-based material. The reinforcing component, the coagulation regulating component, the corrosion preventing component and the expansion component can improve the bending strength, the compressive strength, the wear resistance parameter, the frost resistance grade and other parameters of the fabric concrete, can adjust the coagulation time of the fabric concrete and ensure the rapid traffic after the repair. The cement is low-alkalinity sulphoaluminate cement.
Further, the reinforcing component is one or more of nano SiO2, silica fume, rubber powder, metakaolin, nano calcium and sodium sulfate.
Further, the coagulation regulating component is one or more of lithium carbonate, CaCl2, boric acid and gypsum.
Further, the anti-corrosion component is one or more of boron nitride, silicon phosphate and calcium nitrite.
Further, the expansion component is one or more of calcium sulphoaluminates, calcium oxides and calcium sulphoaluminates-calcium oxides.
The invention also provides fabric concrete for repairing the bridge expansion joint, which comprises a first fabric structure, wherein the first fabric structure comprises two first fabric layers which are oppositely arranged and a plurality of wire piles which are connected with the two first fabric layers, and the cement-based material is filled between the wire piles. According to the invention, the fabric concrete has the toughness of the first fabric structure and the strength of the cement-based material, and the first fabric structure improves the toughness and crack resistance of the fabric concrete and improves the strength. The first fabric structure may also serve as a carrier for the cement-based material.
Further, the number of the first fabric structures is at least two, and each first fabric structure is overlapped; preferably, the first fabric layer is a mesh structure. The two ends of each wire pile are respectively connected with the two first fabric layers, so that the first fabric structure forms a firm whole. The at least two first fabric structures are stacked, so that the forming thickness (height) of the fabric concrete can be adjusted, and the fabric concrete is suitable for repairing different expansion joints. Through setting up first fabric layer for network structure for the cement-based material can pass first fabric layer, makes the contact of cement-based material and first fabric structure inseparabler.
Further, the fabric concrete further comprises a second fabric structure for hermetically accommodating the first fabric structure; preferably, an adhesive layer for adhering the second fabric structure in the repair groove of the expansion joint is further arranged on the outer side of the second fabric structure. Preferably, the second fabric structure is composed of a top surface encapsulation layer, a bottom surface encapsulation layer and a side surface encapsulation layer which form an integral structure. Preferably, the second textile structure is a water-permeable synthetic material of synthetic fibres which has been needled or knitted. Preferably, the adhesive layer is disposed under the bottom surface encapsulation layer or on the side surface encapsulation layer. Through setting up the second fabric structure, the first fabric structure and cement-based material can be wrapped up to the second fabric structure, can avoid cement-based material to spill from the fabric structure, and be convenient for add cement-based material in the second fabric structure. The first textile structure and the second textile structure are fixedly connected. The two form an integral structure, and the integrity of the fabric is ensured. By arranging the adhesion layer, the fabric concrete can be firmly bonded with a construction working face without sliding, the purpose of fixed-point construction is achieved, and the functions of seepage prevention, water prevention and falling prevention are achieved.
The invention also provides a preparation method of the fabric concrete for repairing the bridge expansion joint, which is characterized in that the second fabric structure is composed of a top surface packaging layer, a bottom surface packaging layer and a side surface packaging layer which form an integral structure, and the preparation method comprises the following steps:
(a-1) respectively sealing the first fabric layer of the first fabric structure with the bottom surface packaging layer and the side surface packaging layer of the second fabric structure, and not sealing the first fabric structure and the top surface packaging layer;
(b-1) uniformly mixing the cement, the reinforcing component, the coagulation regulating component, the anti-corrosion component and the expansion component under a drying condition to obtain a dry cement-based material;
(c-1) filling the cement-based material dried in the step (b-1) between the respective wire piles;
(d-1) sealing the first fabric structure and the top surface packaging layer after the cement-based material is filled to obtain uncured fabric concrete;
the order of step (a-1) and step (b-1) may be reversed.
The cement-based material is obtained under the dry condition, and the fabric concrete is not cured after the cement-based material is filled, so that the shape of the fabric concrete can be adjusted, the fabric concrete can be suitable for repairing different expansion joints, the fabric concrete is only required to be placed into a bridge expansion joint repairing groove, and then is watered and cured into a fixed shape, the repair of the bridge expansion joint can be realized, the method is simple, compared with the traditional repair of the bridge expansion joint, the repair process is greatly simplified, and the time is saved. In step (a-1), the cement-based material is spread from the top surface of the fabric in step (b-1) in a facilitated manner since the first fabric structure and the top encapsulation layer are not sealed. In the step (d-1), after the cement-based material is filled, the first fabric structure and the top surface packaging layer are sealed, so that the cement-based material is prevented from leaking from the fabric. Because the cement-based material is in a dry condition, the cement-based material needs to be stirred at a low speed in a dry stirrer, so that the waste caused by splashing of the cement-based material is avoided.
The invention also provides a bridge expansion joint repairing method by using any one of the fabric concrete, which comprises the following steps:
(a-2) placing the uncured fabric concrete into a repairing groove of the expansion joint to be repaired;
(b-2) pouring water into the fabric concrete to cure the fabric concrete;
and (c-2) after watering is finished, curing for 0.5-1 h, and finishing repairing.
The fabric concrete provided by the invention is convenient to use, good in mechanical property, good in durability, fast in traffic and simple and easy to maintain. The fabric concrete has the following performance: the fabric concrete has high toughness and frost resistance grade of not less than F25, the compressive strength of the fabric concrete after 1 hour of the fabric concrete forming is not less than 40Mpa, and the compressive strength of the fabric concrete after 28 days of the fabric concrete forming is not less than 90 Mpa. The fabric concrete can be conveniently constructed, can open traffic 0.5-1 h after construction is finished, has the advantages of high strength, high toughness, good durability, easiness in maintenance, flame retardance and the like, can realize no vehicle jumping, low noise and wear resistance, and simultaneously ensures the driving comfort and safety. The construction scheme of watering, curing and forming is simple and efficient, can meet the application requirements of various treatment projects such as bridge expansion joint maintenance, pavement reflection crack treatment, pit groove repair and the like, provides an effective method for solving the common engineering problems of high maintenance cost, large project amount, poor durability, long construction period and the like in bridge expansion joint maintenance at present, and has important practical significance for maintaining ecological balance and realizing sustainable development. The fabric concrete manufactured by the invention is not cured, so the shape of the fabric concrete can be adjusted, the fabric concrete can be suitable for repairing different expansion joints, the expansion joint can be repaired only by placing the fabric concrete into an expansion joint repairing groove and watering and curing the fabric concrete into a fixed shape, the method is simple, compared with the traditional expansion joint repairing, the repairing process is greatly simplified, and the time is saved.
Compared with the prior art, the invention has the beneficial effects that:
(1) the raw material and the mixing ratio design adopted by the invention are different from those of common concrete, and compared with the raw material and the mixing ratio method of the fabric concrete cement-based material, the theory is more mature and perfect, the operation is simple, the cost is controllable, and the performance is better;
(2) the fabric concrete adopts the aggregate-free cement-based material, so that bubbles and air holes can be avoided after the concrete is formed, and the corrosion caused by leakage is reduced, thereby improving the mechanical property and durability of the fabric concrete;
(3) the fabric concrete prepared by the invention has the toughness of the fabric and the mechanical property of the cement-based material, and has better mechanical property and better durability and is less prone to brittle failure compared with common concrete; by adopting a watering rapid curing molding method, a series of problems of difficult maintenance, poor maintenance effect, high maintenance cost and the like can be effectively solved;
(4) the invention provides a solution and a maintenance technical scheme aiming at the engineering problems of high maintenance cost, large engineering quantity, poor durability, long construction period and the like commonly existing in the maintenance of the bridge expansion joint at present and having great influence on the comprehensive performance, the service quality, the service life, the popularization and the application and the like of a bridge expansion joint maintenance material, the technology ensures that the fabric concrete has high toughness and the frost resistance grade is not less than F25, meets the requirement of quick traffic (traffic can be started after 0.5-1 h after the fabric concrete is formed), simultaneously ensures that the compressive strength of the fabric concrete is not less than 40Mpa after 1h after the fabric concrete is formed and is not less than 90Mpa after 28 days after the fabric concrete is formed, can effectively solve the problems of long construction period and poor durability of the common concrete due to the poor performance thereof, and can be widely used for bridge expansion joint maintenance, road surface white-to-black reflection crack repair, The pavement pit repairing method can be used for repairing pavement pits and can be applied to complex conditions such as heavy traffic, heavy traffic and the like.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
FIG. 1 is a schematic longitudinal section of a fabric concrete of an embodiment of the present invention;
FIG. 2 is a schematic longitudinal cross-sectional view of a first fabric structure of fabric concrete unfilled with a cement-based material according to an embodiment of the present invention;
FIG. 3 is a schematic top view of a first fabric layer of a first fabric structure of the fabric concrete of an embodiment of the present invention;
FIG. 4 is a schematic longitudinal cross-section of a fabric concrete filled with no cement-based material and provided with two first fabric layers on top of each other according to an embodiment of the present invention;
FIG. 5 is a schematic cut-away view of a first fabric structure of an embodiment of the present invention, unfilled with a cementitious material;
fig. 6 is a schematic cut-away view of a first fabric structure filled with a cementitious material in accordance with an embodiment of the present invention.
In the figure, 11, a first fabric layer, 12, wire piles, 21, a top surface packaging layer, 22, a bottom surface packaging layer, 23, a side surface packaging layer, 3, a cement-based material, 4 and an adhesion layer.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The invention provides a cement-based material for repairing a bridge expansion joint, wherein the cement-based material 3 comprises the following components: 60-75 parts of cement and 25-40 parts of modified material; the modified material comprises the following components: 50-80 parts of reinforcing component, 20-40 parts of coagulation regulating component, 0.5-5 parts of corrosion preventing component and 0.5-5 parts of expansion component.
The modified material comprises a reinforcing component, a coagulation regulating component, an anti-corrosion component and an expansion component. The reinforcing component is used for adjusting the flexural strength, compressive strength, wear resistance and frost resistance of the cement-based material 3. The set-regulating component is used to adjust the setting time of the cementitious material 3. The corrosion inhibiting component serves to protect the cementitious material 3 from corrosion. The expansion component is used to adjust the expansion properties of the cement-based material 3. The cement-based material 3 can be cured to form strength after being watered.
The cement is sulphoaluminate cement. The sulphoaluminate cement is preferably a low alkalinity sulphoaluminate cement.
The reinforcing component is one or more of nano SiO2, silica fume, rubber powder, metakaolin, nano calcium and sodium sulfate. The reinforcing component is used for adjusting workability, fracture resistance, compression strength, cohesiveness, mechanical property, toughness, impermeability, wear resistance and freezing resistance of the cement-based material 3. The main functions of the reinforcing component comprise improving the workability of the fabric concrete, improving the breaking strength and the compressive strength of each age, increasing the caking property of the cement-based material 3, enhancing the mechanical property, improving the toughness and improving the impermeability and the wear resistance.
The coagulation regulating component is one or more of lithium carbonate, CaCl2, boric acid and gypsum. The set-regulating component is used to regulate the initial setting time and the final setting time of the cementitious material 3. The main functions of the coagulation regulating component materials comprise that the initial setting time and the final setting time of the cement-based material 3 are controlled and regulated through the mixing amount, so that the fabric concrete can adapt to different climatic environments.
The anti-corrosion component is one or more of boron nitride, silicon phosphate and calcium nitrite. The corrosion inhibiting component serves to protect the cementitious material 3 from corrosion. The main functions of the anti-corrosion component material comprise that the fabric concrete has good performances of salt ion corrosion resistance, freeze-thaw cycle damage resistance, high permeation resistance and the like.
The expansion component is one or more of calcium sulphoaluminates, calcium oxides and calcium sulphoaluminates-calcium oxides. The expansion component is used to adjust the expansion properties of the cement-based material 3. The main functions of the expansion component include stabilizing the expansion performance of the cement-based material 3, good durability and continuous increase of strength, thereby preventing cracks of the fabric concrete due to temperature difference.
In the invention, the reinforcing component, the coagulation regulating component, the corrosion-resistant component and the expansion component all have the following effects on repairing the bridge expansion joint: if the reinforcing component is not used, the fabric concrete can not meet the requirement on the mechanical property of the traffic in a short time, so that the application range of the fabric concrete is influenced; if the coagulation regulating component is not used, the fabric concrete can be formed for a long time, so that the aims of quick repair and short-time traffic opening can not be fulfilled; if the anti-corrosion component is not used, the salt ion corrosion resistance of the fabric concrete is reduced, so that the whole anti-corrosion capability is insufficient, and the fabric concrete is difficult to adapt to a construction environment with a severe environment; if the expansion component is not used, the volume shrinkage of the cement-based material after hydration is too large, so that the integral structure of the fabric concrete deforms, and the comprehensive performance is reduced. The fabric concrete is made of the cement-based material containing the combination of the reinforcing component, the coagulation regulating component, the anti-corrosion component and the expansion component, so that the fabric concrete can achieve the purposes of high strength, quick hardening, strong anti-erosion capability and stable integral structure.
As shown in FIG. 1, the present invention provides a fabric concrete for repairing a bridge expansion joint, comprising a fabric and a cement-based material 3 filled in the fabric. The cement-based material 3 is densely filled in the fabric. The fabric concrete is formed by densely filling high-performance fabric serving as a carrier and a cement-based material 3 serving as a filler. The fabric is a three-dimensional spacer fabric. The fabric includes a first fabric structure and a second fabric structure encasing the first fabric structure.
The fabric concrete for repairing the bridge expansion joint comprises a first fabric structure, a second fabric structure and the cement-based material 3.
The first fabric structure and the second fabric structure are sealed with each other, and the cement-based material 3 is filled in the first fabric structure. The first and second textile structures are sealed by a needling process. The thickness of the fabric is 5mm-40mm, and the fabric concrete with different performance grades and multiple purposes can be formed, so that the applicable engineering range of the fabric concrete is greatly increased. The first and second textile structures are wrapped and wrapped in nature. The second fabric structure comprises a top surface packaging layer 21, a bottom surface packaging layer 22 and a side surface packaging layer 23, and the first fabric structure is subjected to all-dimensional covering, wrapping and packaging. The first fabric structure and the second fabric structure are tightly attached. Fig. 5 is a schematic cut-away view of a first fabric structure of an unfilled cement-based material in accordance with an embodiment of the present invention. Fig. 6 is a schematic cut-away view of a first fabric structure filled with a cementitious material in accordance with an embodiment of the present invention. For simplicity, the specific structure of the first fabric layer 11 is not shown in fig. 5 and 6. For the sake of omission, the same structure is not drawn in fig. 5 and 6.
As shown in fig. 2-3, the first fabric structure includes two first fabric layers 11 disposed opposite to each other and a plurality of wire stubs 12 connecting the two first fabric layers 11, and the cement-based material 3 is filled between the respective wire stubs 12. The first fabric layer 11 is a net-like fiber fabric layer. Preferably, the reticular fiber fabric layer is reticular fiber mesh cloth. The two first fabric layers 11 of the first fabric structure are respectively positioned above and below, with a wire pile 12 connected in between.
As shown in fig. 4, if the thickness of the fabric concrete needs to be adjusted, the number of the first fabric structures can be adjusted, the number of the first fabric structures is at least two, and the first fabric structures are stacked. And a cement-based material 3 is filled between the upper surface and the lower surface of the first fabric layer 11. Preferably, the first fabric layer 11 is a net structure. The at least two first fabric structures are stacked, so that the forming thickness (height) of the fabric concrete can be adjusted, and the fabric concrete is suitable for repairing different expansion joints. Through setting up first fabric layer for network structure for the cement-based material can pass first fabric layer, makes the contact of cement-based material and first fabric structure inseparabler. The first fabric layer 11 of the first fabric structure located above is referred to as the upper fabric layer, and the first fabric layer 11 of the first fabric structure located below is referred to as the lower fabric layer. When each first fabric structure stacks the setting, cement-based material leaks between the wire pile 12 from the network structure of the last fabric layer of the first fabric structure that is located the top, leaks again to the lower fabric layer, leaks again to the first fabric structure that is located the below, leaks between the wire pile 12 from the last fabric layer of the first fabric structure that is located the below, realizes the packing of cement-based material 3 between the wire pile 12 of each first fabric structure to guarantee holistic fabric concrete's the closely knit degree of packing. The first fabric structure can be woven through the warp knitting machine under the automatic control of a microcomputer.
In the first fabric structure, both ends of each of the yarn pegs 12 are connected to two first fabric layers 11, respectively, so that the first fabric structure forms one firm whole.
The second textile structure is adapted to sealingly receive the first textile structure. The second fabric structure is composed of a top surface packaging layer 21, a bottom surface packaging layer 22 and a side surface packaging layer 23 which form an integral structure; preferably, the second textile structure is a water-permeable synthetic material of synthetic fibres which has been needled or knitted.
And an adhesive layer 4 for adhering the second fabric structure in a repairing groove of the expansion joint is also arranged on the outer side of the second fabric structure. The adhesive layer 4 is disposed under the bottom surface encapsulation layer or on the side surface encapsulation layer. The adhesive layer 4 has the main function of firmly bonding the fabric concrete and the construction working face without sliding, thereby achieving the purpose of fixed-point construction and playing the roles of seepage prevention, water prevention and falling prevention. The adhesive layer 4 can be one or more of reaction type normal temperature asphalt, high-viscosity high-elasticity asphalt, pressure-sensitive adhesive, heat-sensitive adhesive, epoxy resin, thermosetting resin and synthetic resin polymer.
In the invention, the first fabric structure and the second fabric structure are cut into proper sizes, and then the first fabric structure and the second fabric structure are sealed at the bottom and the side by a needling process, and top surface fillers are reserved for standby; calculating the proportion of the cement-based material 3 and uniformly mixing; vibrating the filler until the filler is compact; the top surface of the package is formed of fabric concrete; after the manufacture is finished, placing the fabric concrete into the expansion joint repairing groove, watering, curing and shaping, and curing for 0.5-1 h to finish the repairing.
The invention provides a preparation method of the fabric concrete, which is characterized by comprising the following steps:
(a-1) preparation of the Fabric:
cutting the first fabric structure and the second fabric structure into proper sizes, and performing needle punching sealing on the first fabric structure and the top surface packaging layer 21 and the bottom surface packaging layer 22 of the second fabric structure respectively through a needle punching process, wherein the first fabric structure and the top surface packaging layer 21 are not sealed, and the top surface packaging layer 21 is reserved for standby. After the sealing in this step is completed, the fiber yarn produced by the needle punching process and placed on the outer surface of the bottom encapsulation layer 22 is subjected to heat treatment to form a plurality of heat-shrinkable spherical knots, and the heat-shrinkable spherical knots are tightly attached to the outer surface of the bottom encapsulation layer 22. The compactness of the fiber fabric can be further improved by carrying out heat treatment on the fiber yarns, and the attractiveness of the fabric concrete can also be ensured. In this embodiment, the first fabric layer 11 is a mesh-like fabric layer. Preferably, the reticular fiber fabric layer is reticular fiber mesh cloth. The mesh fabric preferably has a circular top surface eyelet shape, and the top surface eyelets are arranged in a rectangular array. The diameter of the top surface aperture may be determined as is practical and will be understood by those skilled in the art. In the present invention, the sealing can be performed by needle punching, or by other methods, as will be understood by those skilled in the art.
(b-1) preparation of cement-based materials:
and calculating the proportion of each component in the cement-based material 3, weighing the cement, the reinforcing component, the coagulation regulating component, the anti-corrosion component and the expansion component, manually and primarily stirring the components uniformly under a dry condition, and adding the primarily stirred materials into a dry stirrer to stir at a low speed for 2-3min to obtain the dry and uniformly mixed cement-based material 3. The volume of the required cement-based material and fabric is calculated by taking the filling saturation (compactness) of more than or equal to 98.6 percent as a standard. The mixing time of the mixer can be determined according to actual conditions, and can be understood by those skilled in the art. The fabric concrete comprises, by weight, 60-75 parts of cement and 25-40 parts of a modified material, wherein the modified material comprises, by weight, 50-80 parts of a reinforcing component, 20-40 parts of a set adjusting component, 0.5-5 parts of an anti-corrosion component and 0.5-5 parts of an expansion component. The cement is preferably a low alkalinity sulphoaluminate cement.
(c-1) Cement-based Material filling
And (3) fixing the fabric serving as the filling carrier at a corresponding position on the vibration table, starting the vibration table while vibrating the vibration table, taking out the cement-based material 3 uniformly mixed in the step (b-1), and uniformly spreading the cement-based material on the reserved top surface of the fabric for multiple times, namely spreading the cement-based material on the top surface of the first fabric structure until all the cement-based material 3 is filled. And filling the cement-based material 3 until the cement-based material is compact, namely finishing filling.
(d-1) filling a cement-based material to perform needle-punching sealing on the top surface:
and after the cement-based material 3 is filled, closing the vibrating table, taking out the fabric concrete, and performing needling sealing on the first fabric structure and the top surface packaging layer 21 to obtain an uncured fabric concrete finished product.
In the preparation method of the fabric concrete, the sequence of the step (a-1) and the step (b-1) can be changed.
The invention also provides a bridge expansion joint repairing method by using the fabric concrete, which comprises the following steps:
(a-2) placing the uncured fabric concrete into a repairing groove of the expansion joint to be repaired, and bonding the adhesive layer 4 in the repairing groove of the expansion joint, wherein the repairing groove of the expansion joint is processed in advance;
(b-2) watering the fabric concrete by using a tap water pipe, and carrying out watering forming to solidify the fabric concrete;
(c-2) after watering, curing for 0.5-1 h to finish repairing and open traffic.
The method for repairing the expansion joint is mainly used for repairing the expansion joint of the bridge.
Example one
In this embodiment, the materials are weighed according to the filling saturation (compactness) of not less than 98.6%, and the cement-based material of the fabric concrete comprises the following components in parts by weight: 65 parts of low-alkalinity sulphoaluminate cement, 23 parts of reinforcing component, 10 parts of coagulation regulating component, 1 part of anti-corrosion component and 1 part of expansion component. The uncured fabric concrete is prepared by the preparation method of the fabric concrete.
In the embodiment, after the uncured fabric concrete is obtained, the fabric concrete is placed on a test bed, watering and molding are carried out by using a tap water pipe, and after watering is finished, curing is carried out for 40min until the strength is stable. And after curing for 40min, detecting and analyzing the formed shape, mechanical strength, wear resistance and toughness of the fabric concrete through appearance observation and performance experiments.
The results of the performance test of the fabric concrete obtained according to example one are shown in table 1.
Example two:
in this embodiment, the materials are weighed according to the filling saturation (compactness) of not less than 98.6%, and the cement-based material of the fabric concrete comprises the following components in parts by weight: 65 parts of low-alkalinity sulphoaluminate cement, 23 parts of reinforcing component, 10 parts of coagulation regulating component, 1 part of anti-corrosion component and 1 part of expansion component. Uncured fabric concrete was prepared using the same fabric concrete preparation method as in example one.
In the embodiment, after the uncured fabric concrete is obtained, the fabric concrete is placed in the expansion joint which is processed in advance, watering and forming are carried out by using a tap water pipe, and after watering is finished, curing is carried out for 0.5-1 h, and then repairing can be completed.
The results of the fabric concrete test obtained according to example two are shown in table 1.
EXAMPLE III
In this embodiment, the materials are weighed according to the filling saturation (compactness) of not less than 98.6%, and the cement-based material of the fabric concrete comprises the following components in parts by weight: 85 parts of low-alkalinity sulphoaluminate cement, 10 parts of reinforcing component, 3 parts of coagulation regulating component, 1 part of anti-corrosion component and 1 part of expansion component. Uncured fabric concrete was prepared using the same fabric concrete preparation method as in example one.
The results of the fabric concrete test obtained according to example three are shown in table 1.
Example four
In this embodiment, the materials are weighed according to the filling saturation (compactness) of not less than 98.6%, and the cement-based material of the fabric concrete comprises the following components in parts by weight: 73 parts of low-alkalinity sulphoaluminate cement, 18 parts of reinforcing component, 7 parts of coagulation regulating component, 1 part of anti-corrosion component and 1 part of expansion component. Uncured fabric concrete was prepared using the same fabric concrete preparation method as in example one.
The results of the fabric concrete test obtained according to example four are shown in table 1.
EXAMPLE five
In this embodiment, the materials are weighed according to the filling saturation (compactness) of not less than 98.6%, and the cement-based material of the fabric concrete comprises the following components in parts by weight: 60 parts of low-alkalinity sulphoaluminate cement, 26 parts of reinforcing component, 12 parts of coagulation regulating component, 1 part of anti-corrosion component and 1 part of expansion component. Uncured fabric concrete was prepared using the same fabric concrete preparation method as in example one.
The results of the fabric concrete test obtained according to example five are shown in table 1.
Example six:
in this embodiment, the materials are weighed according to the filling saturation (compactness) of not less than 98.6%, and the cement-based material of the fabric concrete comprises the following components in parts by weight: 43 parts of low-alkalinity sulphoaluminate cement, 35 parts of reinforcing component, 20 parts of coagulation regulating component, 1 part of anti-corrosion component and 1 part of expansion component. Uncured fabric concrete was prepared using the same fabric concrete preparation method as in example one.
The results of the fabric concrete tests obtained according to example six are shown in table 1.
TABLE 1 test results for textile concrete
In the present application, the weight parts of the cement in the cement-based material are preferably 60-75 parts, and the weight parts of the reinforcing component and the set-regulating component in the modifying material are preferably 50-80 parts and 20-40 parts, respectively, so that the weight parts of the reinforcing component and the set-regulating component in the cement-based material are 12.5-32 parts and 5-16 parts, respectively, and therefore, in the third embodiment and the sixth embodiment, the weight parts of the cement, the reinforcing component and the set-regulating component in the cement-based material are not within the range. In both examples one and two, the weight parts of cement, reinforcing component, set-adjusting component in the cementitious material are within the preferred ranges of the present application. In examples four and five, the parts by weight of cement, reinforcing component, set-adjusting component in the cementitious material are all within the preferred ranges herein and near the endpoints of that range.
As can be seen from table 1:
(1) the bending strength, the compressive strength, the wear resistance parameters and the frost resistance grade of the fabric concrete in the first, second, fourth and fifth examples are obviously better than the corresponding measurement results in the third and sixth examples.
(2) In the first, second, fourth and fifth examples, the initial setting time of the fabric concrete is less than 20min, and the final setting time is less than 35 min; the required coagulation time is therefore shorter; in the third embodiment, the initial setting time reaches 30min, the final setting time reaches 50min, and the required setting time is longer; in the sixth example, the initial setting time and the final setting time were short, but the impact toughness was poor and the cracking was severe.
(3) Although the weight parts of each component are the same in the first and second examples, there is a slight difference in practice due to the difference in test conditions, and it is a normal phenomenon.
From the above results, it can be proved that the preferable ranges of the cement, the reinforcing component and the set-regulating component in the cement-based material are the optimal proportioning ranges.
The finished product of the fabric concrete has the characteristics of light weight, high tensile strength, good permeability, high temperature resistance, freezing resistance, aging resistance and corrosion resistance, and has excellent drainage, isolation, reinforcement, seepage prevention and protection effects.
Compared with common concrete, the fabric concrete has greatly improved performance, greatly shortened setting time, greatly enhanced tensile strength and bending strength, good impact toughness, no delamination and no cracking.
In the existing ultra-fast hard concrete, the traffic can be recovered after waiting for 2 to 3 hours. Compared with the existing expansion joint repair, the fabric concrete can be conveniently constructed, can open traffic 0.5-1 h after construction is finished, has the advantages of high strength and toughness, good durability, easiness in maintenance, flame retardance and the like, can realize no vehicle jump, is low in noise and abrasion resistance, and simultaneously ensures the driving comfort and safety. The construction scheme of watering, curing and forming is simple and efficient, can meet the application requirements of various treatment projects such as bridge expansion joint maintenance, pavement reflection crack treatment and pit groove repair, and has important practical significance for maintaining ecological balance and realizing sustainable development.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (11)
1. The utility model provides a cement-based material for repairing bridge expansion joint which characterized in that: the cement-based material (3) is composed of the following components: low alkalinity sulphoaluminate cement and modified materials; the modified material comprises the following components: a reinforcing component, a coagulation regulating component, an anti-corrosion component and an expansion component; the anti-corrosion component is one or more of boron nitride, silicon phosphate and calcium nitrite;
the cement-based material (3) comprises the following components in parts by weight: 60-73 parts of low-alkalinity sulphoaluminate cement, 18-26 parts of reinforcing component, 7-12 parts of coagulation regulating component, 1 part of anti-corrosion component and 1 part of expansion component.
2. The cementitious material of claim 1, wherein: the reinforcing component is nano SiO2One or more of silica fume, rubber powder, metakaolin, nano calcium and sodium sulfate.
3. The cementitious material of claim 1, wherein: the coagulation regulating component is lithium carbonate and CaCl2One or more of boric acid and gypsum.
4. The cementitious material of claim 1, wherein: the expansion component is one or more of calcium sulphoaluminates, calcium oxides and calcium sulphoaluminates-calcium oxides.
5. The utility model provides a fabric concrete for repairing bridge expansion joint which characterized in that: comprising a first textile structure comprising two first textile layers (11) arranged opposite to each other and a plurality of wire stubs (12) connecting the two first textile layers (11), each wire stub (12) being filled with a cement-based material (3) as claimed in any one of claims 1-4.
6. The fabric concrete according to claim 5, wherein: the number of the first fabric structures is at least two, and each first fabric structure is overlapped.
7. The fabric concrete according to claim 6, wherein: the first fabric layer (11) is of a net-shaped structure.
8. The fabric concrete according to claim 5 or 6, wherein: a second fabric structure is included for sealingly receiving the first fabric structure.
9. The fabric concrete according to claim 8, wherein: and an adhesion layer (4) for adhering the second fabric structure in the repair groove of the expansion joint is also arranged on the outer side of the second fabric structure.
10. A method of preparing the fabric concrete for repairing a bridge expansion joint according to claim 8 or 9, wherein the second fabric structure is composed of a top surface encapsulation layer (21), a bottom surface encapsulation layer (22) and a side surface encapsulation layer (23) which form an integral structure, the method comprising the steps of:
(a-1) respectively sealing the first fabric layer (11) of the first fabric structure with the bottom surface packaging layer (22) and the side surface packaging layer (23) of the second fabric structure, and not sealing the first fabric structure and the top surface packaging layer (21);
(b-1) uniformly mixing the cement, the reinforcing component, the coagulation regulating component, the anti-corrosion component and the expansion component under a dry condition to obtain a dry cement-based material (3);
(c-1) filling the cement-based material (3) dried in step (b-1) between the respective wire piles (12);
(d-1) sealing the first fabric structure and the top surface packaging layer (21) after the cement-based material (3) is filled to obtain uncured fabric concrete;
the order of step (a-1) and step (b-1) may be reversed.
11. A method for repairing a bridge expansion joint using the fabric concrete according to any one of claims 5 to 9, comprising the steps of:
(a-2) placing the uncured fabric concrete into a repairing groove of the expansion joint to be repaired;
(b-2) pouring water into the fabric concrete to cure the fabric concrete;
and (c-2) after watering is finished, curing for 0.5-1 h, and finishing repairing.
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| CN103541366A (en) * | 2013-09-30 | 2014-01-29 | 宁波和谐信息科技有限公司 | Cement-based composite material carpet and ditch and revetment construction technology of cement-based composite material carpet |
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| US20060042515A1 (en) * | 2004-08-30 | 2006-03-02 | Bodycomb Frederick M | Agglomerated perlite |
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| CN103541366A (en) * | 2013-09-30 | 2014-01-29 | 宁波和谐信息科技有限公司 | Cement-based composite material carpet and ditch and revetment construction technology of cement-based composite material carpet |
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