CN112761376A - Mortar reinforcing and repairing method for wall settlement cracking - Google Patents
Mortar reinforcing and repairing method for wall settlement cracking Download PDFInfo
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- CN112761376A CN112761376A CN202110042393.2A CN202110042393A CN112761376A CN 112761376 A CN112761376 A CN 112761376A CN 202110042393 A CN202110042393 A CN 202110042393A CN 112761376 A CN112761376 A CN 112761376A
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- parts
- wall
- brick wall
- reinforcing
- mortar
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 42
- 238000005336 cracking Methods 0.000 title claims abstract description 28
- 239000011449 brick Substances 0.000 claims abstract description 127
- 239000004567 concrete Substances 0.000 claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 49
- 239000004593 Epoxy Substances 0.000 claims abstract description 43
- 239000002994 raw material Substances 0.000 claims abstract description 24
- 239000010410 layer Substances 0.000 claims abstract description 10
- 238000012423 maintenance Methods 0.000 claims abstract description 9
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 239000003665 fog water Substances 0.000 claims abstract description 8
- 239000002689 soil Substances 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 239000002344 surface layer Substances 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 75
- 239000000843 powder Substances 0.000 claims description 46
- 239000004576 sand Substances 0.000 claims description 43
- 238000002156 mixing Methods 0.000 claims description 31
- 239000006004 Quartz sand Substances 0.000 claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 28
- 239000010959 steel Substances 0.000 claims description 28
- 239000003638 chemical reducing agent Substances 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 23
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 22
- 239000004568 cement Substances 0.000 claims description 22
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 17
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 17
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 17
- 239000002253 acid Substances 0.000 claims description 16
- 239000010456 wollastonite Substances 0.000 claims description 15
- 229910052882 wollastonite Inorganic materials 0.000 claims description 15
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 14
- 239000000835 fiber Substances 0.000 claims description 14
- 239000011863 silicon-based powder Substances 0.000 claims description 14
- 239000003822 epoxy resin Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 12
- 229920000647 polyepoxide Polymers 0.000 claims description 12
- 229920002472 Starch Polymers 0.000 claims description 11
- 239000000440 bentonite Substances 0.000 claims description 11
- 229910000278 bentonite Inorganic materials 0.000 claims description 11
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 11
- 229920003086 cellulose ether Polymers 0.000 claims description 11
- 239000008107 starch Substances 0.000 claims description 11
- 235000019698 starch Nutrition 0.000 claims description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 10
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 9
- 239000004917 carbon fiber Substances 0.000 claims description 9
- 239000003085 diluting agent Substances 0.000 claims description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 7
- 238000009210 therapy by ultrasound Methods 0.000 claims description 7
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims description 6
- 229920001732 Lignosulfonate Polymers 0.000 claims description 4
- 239000002518 antifoaming agent Substances 0.000 claims description 4
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 claims description 3
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical compound O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- -1 aliphatic diamine Chemical class 0.000 claims description 2
- 125000003118 aryl group Chemical group 0.000 claims description 2
- 229920000768 polyamine Polymers 0.000 claims description 2
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 2
- 239000011118 polyvinyl acetate Substances 0.000 claims description 2
- 150000003512 tertiary amines Chemical group 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- 230000002787 reinforcement Effects 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000000654 additive Substances 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 239000013530 defoamer Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000011150 reinforced concrete Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 239000008030 superplasticizer Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229920005646 polycarboxylate Polymers 0.000 description 3
- FUIQBJHUESBZNU-UHFFFAOYSA-N 2-[(dimethylazaniumyl)methyl]phenolate Chemical compound CN(C)CC1=CC=CC=C1O FUIQBJHUESBZNU-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- KIDHWZJUCRJVML-UHFFFAOYSA-N putrescine Chemical compound NCCCCN KIDHWZJUCRJVML-UHFFFAOYSA-N 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 description 1
- JZUHIOJYCPIVLQ-UHFFFAOYSA-N 2-methylpentane-1,5-diamine Chemical compound NCC(C)CCCN JZUHIOJYCPIVLQ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- FDLQZKYLHJJBHD-UHFFFAOYSA-N [3-(aminomethyl)phenyl]methanamine Chemical compound NCC1=CC=CC(CN)=C1 FDLQZKYLHJJBHD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- XXBDWLFCJWSEKW-UHFFFAOYSA-N dimethylbenzylamine Chemical compound CN(C)CC1=CC=CC=C1 XXBDWLFCJWSEKW-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 description 1
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 1
- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
-
- 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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/14—Polyepoxides
-
- 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
-
- 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
- C04B28/04—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
-
- 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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- 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)
- Architecture (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a mortar reinforcing and repairing method for wall settlement cracking, which comprises the following steps: s1, chiseling a plastering surface layer on a brick wall; s2, excavating a soil layer to a strip foundation downwards by the ground against a brick wall; s3, cleaning the brick wall base surface by using a high-pressure water gun; s4, finding out the position of the cavity and repairing the cavity by using epoxy mortar; s5, treating the whole brick wall base surface by using an interface agent; s6, carrying out bar planting treatment on the brick wall; then drenching the wall surface, and manually plastering high-ductility concrete or spraying the high-ductility concrete by a machine; s7, local repairing, and flattening and collecting the surface; fog water maintenance and clean after the work is finished. The process of the invention does not need piling, is convenient for construction, has low cost, does not need large-scale mechanical equipment, and has little damage to the original structure; and materials used in the reinforcement, such as an interface agent, epoxy mortar and high-ductility concrete, are optimized, so that the material for repairing and reinforcing is tightly connected with the raw materials, the strength of the whole wall body is obviously improved after repairing and reinforcing, and the service life is prolonged.
Description
Technical Field
The invention belongs to the technical field of building reinforcement, and mainly relates to a mortar reinforcing and repairing method for wall settlement cracking.
Background
The masonry structure is a wall and a column which are built by blocks and mortar, is used as a structure of a main stress member of a building, comprises a brick masonry, a building block masonry and a stone masonry structure, and is widely applied to industrial and civil buildings. Brick wall is important vertical atress component among the brick masonry structure, appears following problem easily in engineering practice: 1. the bearing capacity of the brick wall can not meet the design requirement generally due to poor construction quality; 2. local wall bodies such as a window wall and the like cannot meet the design requirements; 3. insufficient bearing capacity of brick walls caused by storey addition or overload of houses; 4. the whole wall has insufficient bearing capacity or rigidity due to fire or earthquake.
In particular, the brick foundation and the wall are easy to age and have insufficient strength in the long-time process, especially the ancient brick houses with the service life longer than the service life. The cracks on the structures are that the brick wall, the beam at the top end and the columns on two sides are not constructed according to the specification of the process requirements, so that the structures made of different materials are different in shrinkage coefficient at the connecting part, and the structures are easy to crack because the connection strength is not achieved. The masonry section method has simple construction process and strong adaptability, and is suitable for reinforcing the concrete of beams, plates, columns, walls and general structures; however, the wet operation time of field construction is long, certain influence is caused to production and life, and the clearance of the reinforced building is reduced. CN106978909A discloses a method for connecting a concrete beam with a node steel bar of a steel reinforced concrete column, which comprises the steps of firstly chiseling the interface of new and old concrete in an operation area, chiseling concrete floor boards around the steel reinforced concrete column to the top surface of an original steel bar; positioning and marking the reinforced concrete beam with the enlarged section and the reinforced concrete beam at the stirrup penetrating position, and punching by adopting equipment according to requirements; installing vertical steel bars and stirrups, connecting the stirrups by lap welding after the stirrups penetrate through the beam, and binding and fixing the vertical steel bars and the stirrups; installing an upper connecting steel plate and a lower connecting steel plate; welding the top surface negative moment reinforcing steel bars on the upper connecting steel plate, welding the bottom surface longitudinal stress reinforcing steel bars on the lower connecting steel plate, and welding the reinforcing steel bars with the connecting steel plates by adopting double-sided welding; manufacturing and installing a template; pouring new reinforced concrete or high-strength grouting material; and maintaining until the mold is removed. CN111021773A discloses a method for reinforcing residential buildings with concrete frame structures for civil construction, which is classified as follows: (1) the method for reinforcing the section is to increase the section area of the concrete structure or structure to improve the bearing capacity, meet the normal use, and can be widely used for reinforcing the members of the concrete structure such as beams, plates, columns and the like and general structures. The building reinforcing method provided by the invention can select different reinforcing methods according to actual use requirements, has various reinforcing methods, can be used for pertinently reinforcing different buildings under different conditions, and can effectively improve the earthquake-resistant bearing capacity and the earthquake-resistant deformation capacity of the concrete frame structure building. The wet operation time of the reinforced construction method is long, and the clearance of the reinforced building is reduced.
The ancient brick room's restoration is consolidated because it is little to keep destroying original structure, and the brickwork cross-section method is consolidated and is had certain influence to the headroom and the pleasing to the eye of building, also does not suit the adoption when original brick wall subsides the fracture, because not once only the staggered joint is built between new and old brickwork, can't produce the interlock effect, just so can't form integrative combined work, the brick wall produces the crack easily, consolidates the effect ideal inadequately.
Disclosure of Invention
The invention aims to provide a mortar reinforcing and repairing method for wall settlement cracking, which can be used for construction by common bricklayers without piling, is convenient to construct, has low manufacturing cost, does not need large-scale mechanical equipment, and has little damage to the original structure.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a mortar reinforcing and repairing method for wall settlement cracking comprises the following steps:
s1, chiseling a plastering surface layer on a brick wall, and chiseling to a brick wall base surface;
s2, excavating a soil layer to a strip foundation downwards by the ground against a brick wall;
s3, cleaning the brick wall base surface by using a high-pressure water gun;
s4, finding out the positions of cracking of the brick wall base surface, incomplete brick joints and cavities of the brick joints, and repairing by using epoxy mortar;
s5, treating the whole brick wall base surface by using an interface agent;
s6, carrying out bar planting treatment on the brick wall; then drenching the wall surface, and manually plastering high-ductility concrete or spraying the high-ductility concrete by a machine;
s7, local repairing, and flattening and collecting the surface; fog water maintenance and clean after the work is finished.
The invention mainly aims at the problems that the brick foundation and the wall are aged and have insufficient strength in the long-time process, and the wall is often settled and cracked in the ancient brick houses with the service life being longer than the service life. The process of the invention can be carried out by ordinary clay bricklayers without piling, has convenient construction and low cost, does not need to use large-scale mechanical equipment, and has little damage to the original structure.
In the repairing process, a bar planting technology is adopted, and the bar planting technology is a simpler and more effective connecting and anchoring technology aiming at a concrete structure; the steel bar can be implanted into a common steel bar, and the bolt type anchor bar can also be implanted into the steel bar, and the invention is not limited to the method.
In the invention, preferably, the interfacial agent comprises the following raw materials in percentage by weight: 10-15% of redispersible rubber powder, 45-60% of ordinary portland cement, 0.5-2% of starch ether, 0.5-2% of cellulose ether, 0.05-0.2% of polycarboxylic acid water reducing agent, 5-10% of 20-40 mesh quartz sand and 15-20% of 41-70 mesh quartz sand. Further preferably, the interface agent comprises the following raw materials in percentage by weight: 12% of redispersible rubber powder, 55% of ordinary portland cement, 1.0% of starch ether, 1.0% of cellulose ether, 0.1% of polycarboxylic acid water reducing agent, 8% of 20-40-mesh quartz sand, 18% of 41-70-mesh quartz sand and the balance of other additives.
In the invention, the interface agent plays a role in strengthening the brick wall base surface and allowing other substances to cover the brick wall base surface, and the interface agent needs to have excellent permeability, can fully infiltrate the surface of the wall base material and improve the bonding strength between the interface and various materials. The raw material composition of the interface agent is obtained by a great deal of experimental research of the inventor. Wherein, the redispersible rubber powder can firstly permeate into gaps of the brick wall base surface, and is filled and wrapped, so that the mechanical biting force and van der Waals force are increased; and the cement has water retention property, can fully wet the brick wall surface, fully hydrate the cement, generate more hydration products to be filled in gaps of the brick wall surface, and ensure the mechanical symbiosis between new and old interfaces. The starch ether can affect the consistency of the mortar taking cement as a base material, can reduce the sagging degree of the fresh mortar, and change the construction property and the sagging resistance of the mortar. The starch ether is usually used in combination with unmodified and modified cellulose ether, and the cellulose ether has the functions of water retention and thickening, so that excessive evaporation of water in cement paste is prevented, and sufficient hydration of cement is guaranteed; both neutral and alkaline systems are suitable and are compatible with most additives in cementitious products. The dispersing action of the polycarboxylate superplasticizer destroys the flocculation structure of the cement paste, promotes mutual dispersion of cement particles, improves the fluidity of the paste, can reduce the water-cement ratio of the system, has a compact pore structure, and improves the durability of the later stage. By adding fine sand with different particle sizes as aggregate, good gradation can be generated to improve the pore structure of the interfacial agent, improve the compactness and facilitate the increase of the strength.
In the present invention, preferably, the water reducing agent is one or a combination of two or more of lignosulfonate, naphthalene sulfonate formaldehyde polymer and polycarboxylic acid water reducing agent. Polycarboxylic acid water reducing agents are preferred. The water reducing agent is a concrete admixture capable of reducing the mixing water consumption under the condition of maintaining the slump constant of concrete, has a dispersing effect on cement particles, and can improve the workability, reduce the unit water consumption and improve the fluidity of the concrete admixture; or the unit cement consumption is reduced, and the cement is saved. The polycarboxylate superplasticizer has the outstanding advantages of low mixing amount, good slump retaining performance, low concrete shrinkage, strong adjustability on molecular structure, no use of formaldehyde in the production process and the like. The invention can adjust the molecular structure, functional group and the like of the polycarboxylate superplasticizer according to requirements, thereby changing the service performance of the superplasticizer.
In the invention, preferably, the high-ductility concrete comprises the following components in parts by weight: 80 parts of cement, 50-70 parts of water, 30-40 parts of fly ash, 10-15 parts of PVA (polyvinyl alcohol) fiber, 5-10 parts of quartz sand, 3-7 parts of bentonite, 5-10 parts of alumina and 8-10 parts of a water reducing agent. Further preferably, the high-ductility concrete comprises the following components in parts by weight: 80 parts of cement, 60 parts of water, 35 parts of fly ash, 15 parts of PVA (polyvinyl acetate) fiber, 8 parts of quartz sand, 5 parts of bentonite, 8 parts of alumina and 9 parts of a water reducing agent.
The PVA fiber is selected for the high-ductility concrete, so that the concrete has higher toughness, and the anti-damage capability of the concrete is improved; the PVA fiber (polyvinyl alcohol fiber) is a synthetic fiber spun by using polyvinyl alcohol as a raw material, has good mechanical property, high strength, high modulus and low elongation, and can obviously improve the toughness of concrete when being doped into the concrete. Meanwhile, the content ratio of each raw material is optimized, and the proportion of the PVA fiber to the cement, the fly ash, the quartz sand, the bentonite and the alumina is set, so that the PVA fiber is uniformly dispersed in the concrete and has excellent performance. The bentonite has good slurrying property, so that the concrete is full and smooth; the addition of the aluminum oxide improves the fluidity and the strength of the concrete, and correspondingly improves the acid corrosion resistance and the sulfate corrosion resistance of the concrete. The raw material selection and the proportion of the high-ductility concrete enable the high-ductility concrete to have high ductility, high damage resistance, high durability, high strength (compression resistance and tensile resistance) and good crack control capability.
In the present invention, preferably, the epoxy mortar is prepared by the following method: uniformly mixing silicon powder and wollastonite powder, soaking in absolute ethyl alcohol, adding a silane coupling agent, carrying out ultrasonic treatment for 2 hours, and drying to obtain modified powder; uniformly stirring the graded sand, the carbon fiber and the modified powder at room temperature, sequentially adding the epoxy resin, the diluent and the defoaming agent, and continuously stirring uniformly to obtain a component A; uniformly stirring the curing agent and the accelerator to obtain a component B; and mixing the component A and the component B, and stirring for 1 hour to obtain the epoxy mortar. Further, the epoxy mortar comprises the following raw materials in parts by weight: 40 parts of epoxy resin; 3 parts of a curing agent; 56 parts of graded sand; 8 parts of silicon powder; 5 parts of wollastonite powder; 6 parts of carbon fiber; 3 parts of a defoaming agent; 2 parts of a diluent; 2.5 parts of an accelerator; 2 parts of a silane coupling agent.
Further preferably, the distribution of the graded sand is 15-18% of coarse sand; 64-70% of medium sand; 15-18% of fine sand; the grading is the sand matching condition of large, medium and small particles, and the sand matching of the large, medium and small particle contents is proper, so that the porosity and the total surface area are small, namely the grading of the particles is good; aiming at the characteristics of epoxy mortar, the invention adjusts the distribution of graded sand, can improve the internal structure of mortar, improves the compactness and is beneficial to the increase of strength.
More preferably, the curing agent is one of aliphatic diamine, aromatic polyamine, dicyandiamide and imidazole, and the accelerator is tertiary amine; the particle size of the powder of the silicon powder and the wollastonite powder is 10-50 μm.
In the art, epoxy mortar is generally composed of epoxy resin, curing agent, cement and sand as fillers, the curing agent promotes the curing of the epoxy resin. However, in the epoxy mortar, since the particle size of the sand is large, the packing density of solid matters in the epoxy mortar is low, so that a large amount of epoxy resin is required, and a large number of voids easily cause insufficient compressive strength and flexural strength of the epoxy mortar. In the invention, silicon powder is selected, the particle size of the powder is preferably 10-50 μm, the silicon powder is small in particle and easy to hydrate, can be filled in a gap to increase strength, but is easy to agglomerate in epoxy mortar. In the invention, the wollastonite powder is selected, is fibrous powder, can play a role in bonding in the epoxy mortar, can enhance the strength of the epoxy mortar and simultaneously increase the breaking strength of the epoxy mortar, but is difficult to uniformly disperse in the epoxy mortar to influence the performance of the mortar. The addition of the silica powder and the wollastonite powder can improve the durability of the epoxy mortar. The silane coupling agent can be selected according to the silane coupling agents with good coupling and connecting effects conventionally used in the field, and the silane coupling agents include the commonly used silane coupling agents such as A151 (vinyltriethoxysilane), A171 (vinyltrimethoxysilane), A172 (vinyltris (beta-methoxyethoxy) silane) and the like.
In the present invention, preferably, the bar planting process of S6 is: the thickness of the brick wall is 500mm, small round reinforcing steel bars with the thickness of 6mm are inserted into the brick wall, the insertion depth is 10 cm, and the length of the reinforcing steel bars exposed outside the brick wall is 2 cm; small round steel bars with the diameter of 6mm are implanted into the brick walls in the transverse and longitudinal directions, and the steel bars are welded and fixed at the 2 cm top position of the exposed end; the high-ductility concrete covers the surface of the brick wall and a reinforcing mesh formed by the embedded bars. The bar planting mode is obtained by summarizing long-term practical operation by the inventor, is simple to operate, has obvious reinforcing effect, and cannot cause large structural damage to an original structure.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a mortar reinforcing and repairing method which is convenient to construct and low in manufacturing cost, aiming at the problem that the wall body of an old brick house exceeding the service life is often settled and cracked. The damage to the original structure is very small, and the maintenance and the preservation of old buildings are facilitated.
2. The invention optimizes the materials used in the reinforcement, such as the interface agent, the epoxy mortar and the high-ductility concrete, so that the materials for repairing and reinforcing are tightly connected with the raw materials, the strength of the whole wall body is obviously improved after repairing and reinforcing, and the service life is prolonged.
3. The epoxy mortar used in the invention utilizes the silane coupling agent to modify the silica powder and the wollastonite powder, thereby obviously improving the strength and toughness of the epoxy mortar.
4. The adopted interface agent and the high-ductility concrete are optimized, and particularly, the raw materials are selected and the content of the raw materials is adjusted, so that the interface agent can obviously increase the binding power to a base layer, and the plastering layer is prevented from hollowing and crusting; the high-ductility concrete has high ductility, high damage resistance, high durability, high strength (compression resistance and tensile resistance) and good crack control capability.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the embodiments.
The starting materials used in the following examples are all commercially available unless otherwise specified. Wherein the particle size of the powder of the silicon powder and the wollastonite powder is 10-50 μm.
Example 1:
the mortar reinforcing and repairing method for wall settlement cracking provided by the embodiment comprises the following steps:
s1, estimating and judging a brick wall to be repaired, chiseling a plastering surface layer on the brick wall, and chiseling to a brick wall base surface;
s2, excavating a soil layer to a strip foundation downwards by the ground against a brick wall;
s3, cleaning the brick wall base surface by using a high-pressure water gun;
s4, finding out the positions of cracking of the brick wall base surface, incomplete brick joints and cavities of the brick joints, and repairing by using epoxy mortar;
s5, treating the whole brick wall base surface by adopting an interface agent, and manually coating the interface agent;
s6, carrying out bar planting treatment on the brick wall; then drenching the wall surface, and manually plastering high-ductility concrete or spraying the high-ductility concrete by a machine; s6 the bar planting treatment is as follows: the thickness of the brick wall is 500mm, small round reinforcing steel bars with the thickness of 6mm are inserted into the brick wall, the insertion depth is 10 cm, and the length of the reinforcing steel bars exposed outside the brick wall is 2 cm; small round steel bars of 6mm are implanted into the brick walls in the transverse and longitudinal directions, and the steel bars are welded and fixed at the top position of 2 cm of the exposed end; the high-ductility concrete covers the surface of the brick wall and a reinforcing mesh formed by the embedded bars.
S7, local repairing, and flattening and collecting the surface; fog water maintenance and clean after the work is finished.
The interface agent is prepared by mixing the following raw materials: 10Kg of redispersible rubber powder, 45Kg of ordinary portland cement, 0.5Kg of starch ether, 0.5Kg of cellulose ether, 0.05Kg of polycarboxylic acid water reducing agent, 5Kg of 20-40 mesh quartz sand and 15Kg of 41-70 mesh quartz sand. When in use, a proper amount of water is added according to specific conditions, and a small amount of other additives can be added.
The epoxy mortar is prepared by the following method: uniformly mixing 8Kg of silicon powder and 5Kg of wollastonite powder, soaking the mixture in absolute ethyl alcohol, adding 2Kg of silane coupling agent, carrying out ultrasonic treatment for 2 hours, and drying the mixture to obtain modified powder; stirring and uniformly mixing 56Kg of graded sand, 6Kg of carbon fiber and modified powder at room temperature, sequentially adding 40Kg of epoxy resin, 2Kg of diluent and 3Kg of defoamer, and continuously stirring uniformly to obtain a component A; 3Kg of curing agent and 2.5Kg of accelerator are evenly stirred to obtain a component B; and mixing and stirring the component A and the component B for 1 hour to obtain the epoxy mortar. The adopted graded sand is 15% of coarse sand; 70% of medium sand; 15% of fine sand; 2-methyl pentanediamine is adopted as a curing agent, and triethylamine is adopted as an accelerating agent.
The high-ductility concrete is prepared by mixing the following raw materials: 80Kg of cement, 50Kg of water, 30Kg of fly ash, 10Kg of PVA fiber, 5Kg of quartz sand, 3Kg of bentonite, 5Kg of alumina and 8Kg of polycarboxylic acid water reducing agent.
Example 2:
the mortar reinforcing and repairing method for wall settlement cracking provided by the embodiment comprises the following steps:
s1, estimating and judging a brick wall to be repaired, chiseling a plastering surface layer on the brick wall, and chiseling to a brick wall base surface;
s2, excavating a soil layer to a strip foundation downwards by the ground against a brick wall;
s3, cleaning the brick wall base surface by using a high-pressure water gun;
s4, finding out the positions of cracking of the brick wall base surface, incomplete brick joints and cavities of the brick joints, and repairing by using epoxy mortar;
s5, treating the whole brick wall base surface by adopting an interface agent, and manually coating the interface agent;
s6, carrying out bar planting treatment on the brick wall; then drenching the wall surface, and manually plastering high-ductility concrete or spraying the high-ductility concrete by a machine; s6 the bar planting treatment is as follows: the thickness of the brick wall is 500mm, small round reinforcing steel bars with the thickness of 6mm are inserted into the brick wall, the insertion depth is 10 cm, and the length of the reinforcing steel bars exposed outside the brick wall is 2 cm; small round steel bars of 6mm are implanted into the brick walls in the transverse and longitudinal directions, and the steel bars are welded and fixed at the top position of 2 cm of the exposed end; the high-ductility concrete covers the surface of the brick wall and a reinforcing mesh formed by the embedded bars.
S7, local repairing, and flattening and collecting the surface; fog water maintenance and clean after the work is finished.
The adopted interfacial agent is formed by mixing the following raw materials: 15Kg of redispersible rubber powder, 60Kg of ordinary portland cement, 2Kg of starch ether, 2Kg of cellulose ether, 0.2Kg of polycarboxylic acid water reducing agent, 10Kg of quartz sand of 20-40 meshes and 20Kg of quartz sand of 41-70 meshes. When in use, a proper amount of water is added according to specific conditions, and a small amount of other additives can be added.
The epoxy mortar is prepared by the following method: uniformly mixing 8Kg of silicon powder and 5Kg of wollastonite powder, soaking the mixture in absolute ethyl alcohol, adding 2Kg of silane coupling agent, carrying out ultrasonic treatment for 2 hours, and drying the mixture to obtain modified powder; stirring and uniformly mixing 56Kg of graded sand, 6Kg of carbon fiber and modified powder at room temperature, sequentially adding 40Kg of epoxy resin, 2Kg of diluent and 3Kg of defoamer, and continuously stirring uniformly to obtain a component A; 3Kg of curing agent and 2.5Kg of accelerator are evenly stirred to obtain a component B; and mixing and stirring the component A and the component B for 1 hour to obtain the epoxy mortar. The distribution of the adopted graded sand is 18 percent of coarse sand; medium sand 64 percent; 18% of fine sand; m-xylylenediamine is used as a curing agent, and triethanolamine is used as an accelerator.
The adopted high-ductility concrete is prepared by mixing the following raw materials: 80Kg of cement, 70Kg of water, 40Kg of fly ash, 15Kg of PVA fiber, 10Kg of quartz sand, 7Kg of bentonite, 10Kg of alumina and 10Kg of lignosulfonate water reducing agent.
Example 3:
the mortar reinforcing and repairing method for wall settlement cracking provided by the embodiment comprises the following steps:
s1, estimating and judging a brick wall to be repaired, chiseling a plastering surface layer on the brick wall, and chiseling to a brick wall base surface;
s2, excavating a soil layer to a strip foundation downwards by the ground against a brick wall;
s3, cleaning the brick wall base surface by using a high-pressure water gun;
s4, finding out the positions of cracking of the brick wall base surface, incomplete brick joints and cavities of the brick joints, and repairing by using epoxy mortar;
s5, treating the whole brick wall base surface by adopting an interface agent, and manually coating the interface agent;
s6, carrying out bar planting treatment on the brick wall; then drenching the wall surface, and manually plastering high-ductility concrete or spraying the high-ductility concrete by a machine; s6 the bar planting treatment is as follows: the thickness of the brick wall is 500mm, small round reinforcing steel bars with the thickness of 6mm are inserted into the brick wall, the insertion depth is 10 cm, and the length of the reinforcing steel bars exposed outside the brick wall is 2 cm; small round steel bars of 6mm are implanted into the brick walls in the transverse and longitudinal directions, and the steel bars are welded and fixed at the top position of 2 cm of the exposed end; the high-ductility concrete covers the surface of the brick wall and a reinforcing mesh formed by the embedded bars.
S7, local repairing, and flattening and collecting the surface; fog water maintenance and clean after the work is finished.
The adopted interfacial agent is formed by mixing the following raw materials: 12Kg of redispersible rubber powder, 55Kg of ordinary portland cement, 1.0Kg of starch ether, 1.0Kg of cellulose ether, 0.1Kg of polycarboxylic acid water reducing agent, 8Kg of 20-40 mesh quartz sand and 18Kg of 41-70 mesh quartz sand. When in use, a proper amount of water is added according to specific conditions, and a small amount of other additives can be added.
The epoxy mortar is prepared by the following method: uniformly mixing 8Kg of silicon powder and 5Kg of wollastonite powder, soaking the mixture in absolute ethyl alcohol, adding 2Kg of silane coupling agent, carrying out ultrasonic treatment for 2 hours, and drying the mixture to obtain modified powder; stirring and uniformly mixing 56Kg of graded sand, 6Kg of carbon fiber and modified powder at room temperature, sequentially adding 40Kg of epoxy resin, 2Kg of diluent and 3Kg of defoamer, and continuously stirring uniformly to obtain a component A; 3Kg of curing agent and 2.5Kg of accelerator are evenly stirred to obtain a component B; and mixing and stirring the component A and the component B for 1 hour to obtain the epoxy mortar. The distribution of the adopted graded sand is 16 percent of coarse sand; 68% of medium sand; 16% of fine sand; the curing agent adopts dicyandiamide, and the accelerator adopts benzyldimethylamine.
The adopted high-ductility concrete is prepared by mixing the following raw materials: 80Kg of cement, 60Kg of water, 35Kg of fly ash, 15Kg of PVA fiber, 8Kg of quartz sand, 5Kg of bentonite, 8Kg of alumina and 9Kg of polycarboxylic acid water reducing agent.
Example 4:
the mortar reinforcing and repairing method for wall settlement cracking provided by the embodiment comprises the following steps:
s1, estimating and judging a brick wall to be repaired, chiseling a plastering surface layer on the brick wall, and chiseling to a brick wall base surface;
s2, excavating a soil layer to a strip foundation downwards by the ground against a brick wall;
s3, cleaning the brick wall base surface by using a high-pressure water gun;
s4, finding out the positions of cracking of the brick wall base surface, incomplete brick joints and cavities of the brick joints, and repairing by using epoxy mortar;
s5, treating the whole brick wall base surface by adopting an interface agent, and manually coating the interface agent;
s6, carrying out bar planting treatment on the brick wall; then drenching the wall surface, and manually plastering high-ductility concrete or spraying the high-ductility concrete by a machine; s6 the bar planting treatment is as follows: the thickness of the brick wall is 500mm, small round reinforcing steel bars with the thickness of 6mm are inserted into the brick wall, the insertion depth is 10 cm, and the length of the reinforcing steel bars exposed outside the brick wall is 2 cm; small round steel bars of 6mm are implanted into the brick walls in the transverse and longitudinal directions, and the steel bars are welded and fixed at the top position of 2 cm of the exposed end; the high-ductility concrete covers the surface of the brick wall and a reinforcing mesh formed by the embedded bars.
S7, local repairing, and flattening and collecting the surface; fog water maintenance and clean after the work is finished.
The adopted interfacial agent is formed by mixing the following raw materials: 11Kg of redispersible rubber powder, 55Kg of ordinary portland cement, 1.2Kg of starch ether, 1.2Kg of cellulose ether, 0.1Kg of polycarboxylic acid water reducing agent, 6Kg of 20-40 mesh quartz sand and 17Kg of 41-70 mesh quartz sand. When in use, a proper amount of water is added according to specific conditions, and a small amount of other additives can be added.
The epoxy mortar is prepared by the following method: uniformly mixing 8Kg of silicon powder and 5Kg of wollastonite powder, soaking the mixture in absolute ethyl alcohol, adding 2Kg of silane coupling agent, carrying out ultrasonic treatment for 2 hours, and drying the mixture to obtain modified powder; stirring and uniformly mixing 56Kg of graded sand, 6Kg of carbon fiber and modified powder at room temperature, sequentially adding 40Kg of epoxy resin, 2Kg of diluent and 3Kg of defoamer, and continuously stirring uniformly to obtain a component A; 3Kg of curing agent and 2.5Kg of accelerator are evenly stirred to obtain a component B; and mixing and stirring the component A and the component B for 1 hour to obtain the epoxy mortar. The distribution of the adopted graded sand is 17 percent of coarse sand; 66% of medium sand; 17% of fine sand; the curing agent adopts 2-methylimidazole, and the accelerator adopts dimethylamino methyl phenol.
The adopted high-ductility concrete is prepared by mixing the following raw materials: 80Kg of cement, 55Kg of water, 32Kg of fly ash, 12Kg of PVA fiber, 7Kg of quartz sand, 6Kg of bentonite, 6Kg of alumina and 9Kg of naphthalenesulfonate formaldehyde polymer water reducing agent.
Example 5:
the mortar reinforcing and repairing method for wall settlement cracking provided by the embodiment comprises the following steps:
s1, estimating and judging a brick wall to be repaired, chiseling a plastering surface layer on the brick wall, and chiseling to a brick wall base surface;
s2, excavating a soil layer to a strip foundation downwards by the ground against a brick wall;
s3, cleaning the brick wall base surface by using a high-pressure water gun;
s4, finding out the positions of cracking of the brick wall base surface, incomplete brick joints and cavities of the brick joints, and repairing by using epoxy mortar;
s5, treating the whole brick wall base surface by adopting an interface agent, and manually coating the interface agent;
s6, carrying out bar planting treatment on the brick wall; then drenching the wall surface, and manually plastering high-ductility concrete or spraying the high-ductility concrete by a machine; s6 the bar planting treatment is as follows: the thickness of the brick wall is 500mm, small round reinforcing steel bars with the thickness of 6mm are inserted into the brick wall, the insertion depth is 10 cm, and the length of the reinforcing steel bars exposed outside the brick wall is 2 cm; small round steel bars of 6mm are implanted into the brick walls in the transverse and longitudinal directions, and the steel bars are welded and fixed at the top position of 2 cm of the exposed end; the high-ductility concrete covers the surface of the brick wall and a reinforcing mesh formed by the embedded bars.
S7, local repairing, and flattening and collecting the surface; fog water maintenance and clean after the work is finished.
The adopted interfacial agent is formed by mixing the following raw materials: 13Kg of redispersible rubber powder, 58Kg of ordinary portland cement, 1.5Kg of starch ether, 1.4Kg of cellulose ether, 0.13Kg of polycarboxylic acid water reducing agent, 7Kg of 20-40 mesh quartz sand and 16Kg of 41-70 mesh quartz sand. When in use, a proper amount of water is added according to specific conditions, and a small amount of other additives can be added.
The epoxy mortar is prepared by the following method: uniformly mixing 8Kg of silicon powder and 5Kg of wollastonite powder, soaking the mixture in absolute ethyl alcohol, adding 2Kg of silane coupling agent, carrying out ultrasonic treatment for 2 hours, and drying the mixture to obtain modified powder; stirring and uniformly mixing 56Kg of graded sand, 6Kg of carbon fiber and modified powder at room temperature, sequentially adding 40Kg of epoxy resin, 2Kg of diluent and 3Kg of defoamer, and continuously stirring uniformly to obtain a component A; 3Kg of curing agent and 2.5Kg of accelerator are evenly stirred to obtain a component B; and mixing and stirring the component A and the component B for 1 hour to obtain the epoxy mortar. The distribution of the adopted graded sand is 17 percent of coarse sand; 66% of medium sand; 17% of fine sand; the curing agent adopts tetramethylenediamine, and the accelerator adopts dimethylamino methyl phenol.
The adopted high-ductility concrete is prepared by mixing the following raw materials: 80Kg of cement, 65Kg of water, 38Kg of fly ash, 13Kg of PVA fiber, 8Kg of quartz sand, 5Kg of bentonite, 7Kg of alumina and 9Kg of water reducing agent (a polycarboxylic acid water reducing agent and a lignosulfonate water reducing agent are mixed according to a mass ratio of 1: 1).
Performance testing
The high ductility concrete used in the above examples of the present invention was tested in tensile ductility tests, and the test pieces were 300mm × 60mm × 13mm slabs, with a tensile speed of 0.5mm/min and an extensometer gauge length of 50 mm. The epoxy mortar and high ductility concrete of the above examples were tested for their bonding properties: the concrete experimental methods are all carried out according to the regulations in the building mortar basic performance test method Standard (JGJ/T70-2009). The epoxy mortar used in the above examples of the present invention was subjected to the compression strength and the flexural strength test in accordance with GB/T50081-2002. The test results were compared with commercially available high ductility concrete and epoxy mortar, and the results are shown in table 1:
TABLE 1
From the test results, the epoxy mortar adopted by the invention has good anti-buckling performance and excellent bonding performance, and the adopted high-ductility concrete has good high ductility and bonding strength, meets the standard requirements of masonry structure reinforcement design specifications (GB50702-2011), and has good effect in reinforcement and repair of building structures.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A mortar reinforcing and repairing method for wall settlement cracking is characterized by comprising the following steps:
s1, chiseling a plastering surface layer on a brick wall, and chiseling to a brick wall base surface;
s2, excavating a soil layer to a strip foundation downwards by the ground against a brick wall;
s3, cleaning the brick wall base surface by using a high-pressure water gun;
s4, finding out the positions of cracking of the brick wall base surface, incomplete brick joints and cavities of the brick joints, and repairing by using epoxy mortar;
s5, treating the whole brick wall base surface by using an interface agent;
s6, carrying out bar planting treatment on the brick wall; then drenching the wall surface, and manually plastering high-ductility concrete or spraying the high-ductility concrete by a machine;
s7, local repairing, and flattening and collecting the surface; fog water maintenance and clean after the work is finished.
2. The mortar reinforcing and repairing method for wall settlement cracking according to claim 1, wherein the interface agent comprises the following raw materials in percentage by weight: 10-15% of redispersible rubber powder, 45-60% of ordinary portland cement, 0.5-2% of starch ether, 0.5-2% of cellulose ether, 0.05-0.2% of polycarboxylic acid water reducing agent, 5-10% of 20-40 mesh quartz sand and 15-20% of 41-70 mesh quartz sand.
3. The mortar reinforcing and repairing method for wall settlement cracking according to claim 2, wherein the interface agent comprises the following raw materials in percentage by weight: 12% of redispersible rubber powder, 55% of ordinary portland cement, 1.0% of starch ether, 1.0% of cellulose ether, 0.1% of polycarboxylic acid water reducing agent, 8% of 20-40-mesh quartz sand and 18% of 41-70-mesh quartz sand.
4. The mortar reinforcing and repairing method for wall settlement cracking according to claim 1, wherein the high-ductility concrete comprises the following components in parts by weight: 80 parts of cement, 50-70 parts of water, 30-40 parts of fly ash, 10-15 parts of PVA (polyvinyl alcohol) fiber, 5-10 parts of quartz sand, 3-7 parts of bentonite, 5-10 parts of alumina and 8-10 parts of a water reducing agent.
5. The mortar reinforcing and repairing method for wall settlement cracking according to claim 4, wherein the water reducing agent is one or a combination of more than two of lignosulfonate, naphthalene sulfonate formaldehyde polymer and polycarboxylic acid water reducing agent.
6. The mortar reinforcing and repairing method for wall settlement cracking according to claim 4, wherein the high-ductility concrete comprises the following components in parts by weight: 80 parts of cement, 60 parts of water, 35 parts of fly ash, 15 parts of PVA (polyvinyl acetate) fiber, 8 parts of quartz sand, 5 parts of bentonite, 8 parts of alumina and 9 parts of a water reducing agent.
7. The mortar reinforcing and repairing method for wall settlement cracking according to claim 1, wherein the epoxy mortar is prepared by the following method: uniformly mixing silicon powder and wollastonite powder, soaking the mixture in absolute ethyl alcohol, adding a silane coupling agent for ultrasonic treatment for 2 hours, and drying to obtain modified powder; uniformly stirring the graded sand, the carbon fiber and the modified powder at room temperature, sequentially adding the epoxy resin, the diluent and the defoaming agent, and continuously stirring uniformly to obtain a component A; uniformly stirring the curing agent and the accelerator to obtain a component B; and mixing and stirring the component A and the component B for 1 hour to obtain the epoxy mortar.
8. The mortar reinforcing and repairing method for wall settlement cracking according to claim 7, wherein the distribution of the graded sand is 15-18% of coarse sand; 64-70% of medium sand; 15-18% of fine sand; the curing agent is one of aliphatic diamine, aromatic polyamine, dicyandiamide and imidazole, and the accelerator is tertiary amine; the particle size of the powder of the silicon powder and the wollastonite powder is 10-50 μm.
9. The mortar reinforcing and repairing method for wall settlement cracking according to claim 7, wherein the epoxy mortar comprises the following raw materials in parts by weight: 40 parts of epoxy resin; 3 parts of a curing agent; 56 parts of graded sand; 8 parts of silicon powder; 5 parts of wollastonite powder; 6 parts of carbon fiber; 3 parts of a defoaming agent; 2 parts of a diluent; 2.5 parts of an accelerator; 2 parts of a silane coupling agent.
10. The mortar reinforcing and repairing method for wall settlement cracking according to claim 1, wherein the bar planting treatment of S6 is: the thickness of the brick wall is 500mm, small round reinforcing steel bars with the thickness of 6mm are inserted into the brick wall, the insertion depth is 10 cm, and the length of the reinforcing steel bars exposed outside the brick wall is 2 cm; small round steel bars with the diameter of 6mm are implanted into the brick walls in the transverse and longitudinal directions, and the steel bars are welded and fixed at the 2 cm top position of the exposed end; the high-ductility concrete covers the surface of the brick wall and a reinforcing mesh formed by the embedded bars.
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| CN114575620A (en) * | 2022-04-13 | 2022-06-03 | 中建八局第三建设有限公司 | Formwork-supporting-free reinforcement high-ductility concrete construction method for masonry reinforcement |
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| CN112079596A (en) * | 2020-08-25 | 2020-12-15 | 华恒建设集团有限公司 | Reinforcing and repairing method suitable for wall cracks |
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Application publication date: 20210507 |