CN102912892B - High-ductility fiber concrete combined brick masonry wall and method for constructing same - Google Patents
High-ductility fiber concrete combined brick masonry wall and method for constructing same Download PDFInfo
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- CN102912892B CN102912892B CN201210435004.3A CN201210435004A CN102912892B CN 102912892 B CN102912892 B CN 102912892B CN 201210435004 A CN201210435004 A CN 201210435004A CN 102912892 B CN102912892 B CN 102912892B
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Abstract
The invention discloses a high-ductility fiber concrete combined brick masonry wall and a method for constructing the same to solve problems of fragility, and poor seismic resistance and wholeness of prior common brick masonry walls. The high-ductility fiber concrete combined brick masonry wall is composed of a brick wall, short rebars and a high-ductility fiber concrete surface layer. During the construction, a masonry wall is constructed, the short rebars are embedded in vertical mortar joints of the brick wall, and the high-ductility fiber concrete is coated on the surface of the brick wall. According to the high-ductility fiber concrete combined brick masonry wall and the method for constructing the same, the compressive capacity, the shearing resistance and the seismic resistance of the brick masonry wall are better than those of a traditional brick wall, and brittle failure is not easy to occur; and simultaneously, the brick masonry wall is simple to construct and low in construction cost.
Description
Technical field
The invention belongs to building structure field in field of civil engineering, be specially a kind of high elongation fiber concrete composite brick masonry wall and construction method thereof.
Background technology
Brick masonry structure is mainly built by laying bricks or stones by brick and mortar and is formed, and construction quality differs greatly, and intensity is relatively low, and discreteness is large, and its tension, shearing resistance and anti-bending bearing capacity are all lower.In earthquake, after brick masonry wall cracking, its bearing capacity declines rapidly, very easily collapses, the casualties causing earthquake region huge and serious economic loss.Extensive at China's brick masonry structure Application comparison, therefore the research work of brick masonry structure is seemed particularly important.Find from macroscopical earthquake and experimental study, under geological process brickwork body of wall cracking and collapse, mainly due to the shear strength of body of wall and deformability not enough.To sum up, existing solid brick masonry wall has the shortcoming of fragility, cracking resistance and poor seismic behavior.
Summary of the invention
An object of the present invention is to provide a kind of and not easily brittle fracture occurs and cracking resistance and the good high elongation fiber concrete composite brick masonry wall of anti-seismic performance.
For this reason, high elongation fiber concrete composite brick masonry wall provided by the invention comprises brick wall, is embedded with some bar dowels in the perpends of described brick wall; Described brick wall surface is coated with high elongation fiber concrete surface layer.
Preferably, in above-mentioned some bar dowels, the level interval of adjacent bar dowel and longitudinal pitch are 300mm, the diameter of every root bar dowel is 10 ~ 12mm, every root bar dowel degree of depth imbedded in brick masonry wall perpends is 100 ~ 150mm, and the length that brick masonry wall surface given prominence to by every root bar dowel is 20mm.
Preferably, the thickness of above-mentioned high elongation fiber concrete surface layer is 10 ~ 30mm.
Preferably, the component of above-mentioned high elongation fiber concrete is cement, flyash, silicon ash, sand, PVA fiber and water, wherein, by mass percentage, and cement: flyash: silicon ash: sand: water=1:0.9:0.1:0.76:0.58; Cumulative volume after mixing with cement, flyash, silicon ash, Sha Heshui is for radix, and the volume volume of PVA fiber is 1.5%.
Preferably, above-mentioned cement is P.O.52.5R portland cement; Above-mentioned flyash is I grade of flyash; The loss on ignition of above-mentioned silicon ash is less than 6%, dioxide-containing silica is greater than 85%, specific area is greater than 15000m
2/ kg; The maximum particle diameter of above-mentioned sand is 1.26mm; The length of above-mentioned PVA fiber is 6 ~ 12mm, diameter is more than 26 μm, tensile strength is more than 1200MPa, modulus of elasticity is more than 30GPa.
Preferably, in above-mentioned high elongation fiber concrete, be added with the polycarboxylate water-reducer that water-reducing rate is more than 30%, and 0.8% of the addition cement of water reducing agent, flyash and silicon ash gross mass.
Preferably, the preparation method of above-mentioned high elongation fiber concrete is: stirred by the water adding water reducing agent and 80% after cement, silicon ash, flyash and sand dry mixing evenly; Add the water adding residue 20% after PVA fiber stirs afterwards again stir and obtain high elongation fiber concrete.
Another object of the present invention is to the construction method providing a kind of above-mentioned high elongation fiber concrete composite brick masonry wall, Specific construction process is as follows:
Step one, builds brick wall by laying bricks or stones, and imbeds some bar dowels in the perpends of brick wall;
Step 2, forms high elongation fiber concrete surface layer in the brick wall surface trowelling high elongation fiber concrete laid, this high elongation fiber concrete surface layer by brick wall and bar dowel coated.
The present invention adopts high elongation fiber concrete composite brick masonry wall, utilizes the high elongation fiber concrete of higher-strength and toughness to form parcel to brick masonry wall, improves globality and the anti-seismic performance of brick masonry wall.
Compared with existing ordinary masonry masonry wall, the present invention has following feature:
(1) the present invention imbeds bar dowel in brick masonry wall perpends, both convenient constructions, can strengthen again the adhesive property between brick masonry wall and high elongation fiber concrete surface layer, ensures brick masonry wall and surface layer co-operation.
(2) the high elongation fiber concrete compressive strength that the present invention adopts can reach more than 60MPa, ultimate tensile strength can reach more than 100 times of ordinary concrete, there is the plastic deformation ability of similar steel, and having good adhesive property between brickwork, is a kind of ecological architectural material with high strength, high ductility, high-durability and high damnification resistant ability.
(3) brick masonry wall of the present invention has good durability, can application life of extending structure, increases substantially bearing capacity and the anti-seismic performance of existing brick masonry wall, reduces the work of repairing after even removing macroseism from.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the structural representation of the embodiment of the present invention 1;
Fig. 2 is the A-A direction view of Fig. 1;
Fig. 3 is the structural representation of the embodiment of the present invention 2;
Fig. 4 is the B-B direction view of Fig. 3;
Each coded representation in figure: 1-collar tie beam, 2-brick wall, 3-constructional column, 4-collar tie beam, 5-bar dowel, 6-high elongation fiber concrete surface layer.
Detailed description of the invention
Embodiment 1:
With reference to figure 1 and Fig. 2, the brick wall 2 in the present embodiment is with constructional column 3 and collar tie beam (1,4), and fired common brick block is of a size of 240mm × 115mm × 53mm; Brick wall 2 length is 4.2m, is highly 3m, and thickness is 240mm; Constructional column 3 sectional dimension is 120mm × 240mm; The sectional dimension of collar tie beam 1 is 340mm × 400mm; The sectional dimension of collar tie beam 4 is 180mm × 240mm; Its structure is: in the perpends of brick wall 1, be embedded with some bar dowels 4; High elongation fiber concrete surface layer 6 is had at the outer surface of brick wall 1.Its Specific construction process is:
Step one, builds brick wall 2 by laying bricks or stones, and in the perpends of brick wall 2, imbed some bar dowels 5, then pours into a mould constructional column 3 and collar tie beam 1,4;
Step 2, at the high elongation fiber concrete surface layer 6 of the brick wall 2 surperficial trowelling 20mm thickness laid, this high elongation fiber concrete surface layer by brick wall 2 and bar dowel 5 coated.
The present embodiment Girth 1,4 and constructional column 3 are all by constructional reinforcement, for strengthening the globality of high elongation fiber concrete surface layer 6 and brick masonry wall 2, bar dowel 5 is imbedded as shear connector in the perpends on brick masonry wall 2 surface, the present embodiment bar dowel 5 adopts HRB400 level reinforcing bar, diameter is 12mm, length is 120mm, outstanding brick masonry wall surface 20mm, the longitudinal pitch between adjacent bar dowel 5 and horizontal spacing are 300mm.
The component of the high elongation fiber concrete in this embodiment is cement, flyash, silicon ash, sand, PVA fiber, water reducing agent and water, wherein, by mass percentage, and cement: flyash: silicon ash: sand: water=1:0.9:0.1:0.76:0.58; Cumulative volume after mixing with cement, flyash, silicon ash, Sha Heshui is for radix, and the volume volume of PVA fiber (vinal) is 1.5%; The addition of water reducing agent is 0.8% of cement, flyash and silicon ash gross mass.Wherein: the maximum particle diameter of sand is 1.26mm; PVA fiber is the PA600 fiber type that Shanghai Luo Yang Science and Technology Ltd. produces, and length is 8mm, and diameter is 26 μm, and tensile strength is 1200MPa, and modulus of elasticity is 30GPa; Cement is P.O.52.5R portland cement; Flyash is I grade of flyash; The loss on ignition of silicon ash used is 5%, and dioxide-containing silica is 88%, and specific area is 18000m
2/ kg; Water reducing agent is the high-efficiency water-reducing agent of poly-carboxylic acid of water-reducing rate more than 30%, and polycarboxylate water-reducer is that Jiangsu Botexin Materials Co., Ltd produces
-I type high performance water reducing agent of polyocarboxy acid.
The stirring means of above-mentioned high elongation fiber concrete is: first to pour in forced mixer cement, flyash, silicon ash and sand into dry mixing 2 ~ 3 minutes; Add the water of water reducing agent and 80% again; Then add the water adding residue 20% after PVA fiber stirs 2 minutes again, stir 1 ~ 2 minute.
Below mechanical property test and the result thereof of the high elongation fiber concrete about the present embodiment that inventor provides.
(1) adopt the standard die trial of 70.7mm × 70.7mm × 70.7mm to make test cube, by standard curing method maintenance 60 days, carry out cubic compressive strength test.Result of the test shows: high elongation fiber concrete test block pressure resistance intensity average is 65MPa, and test block unloads after reaching peak load carries out second time loading again, and Residual Compressive Strength can reach 80% of peak load, and test block destructive process has obvious resistance to compression toughness.
(2) adopt the standard die trial of 40mm × 40mm × 160mm to make prism bending resistance test specimen, by standard curing method maintenance 60 days, carry out experiment on flexural behavior.Result of the test shows: the first crack strength of high elongation fiber concrete test specimen is 4.8MPa, after test specimen cracking, bearing capacity continues to improve, ultimate strength is 10.1MPa, and after reaching peak load, depression of bearing force is slow, calculates its bent toughness of bent toughness coefficient I of gained according to ASTM C1018 method
5, I
10, I
20, I
30be respectively 6.2,14.5,33.0,50.6, show to have very high bent toughness.
(3) adopt the die trial of 50mm × 15mm × 350mm to make stretching test block, by standard curing method maintenance 60 days, carry out direct tensile test.Result shows: high elongation fiber concrete test specimen uniaxial tension test average is 3.6MPa, and ultimate tensile strength can reach 1.2%, and after test specimen cracking, bearing capacity remains unchanged substantially, has good tensile toughness, occurs more than 10 cracks in destructive process.
More than test shows, the ultimate tensile strength of high elongation fiber concrete is far above the ultimate tensile strength of ordinary concrete in " Code for design of concrete structures " GB50010, high elongation fiber concrete pressurized, tension, all have higher toughness by during curved destruction, its destructive characteristics has obviously different from ordinary concrete generation brittle fracture.
Embodiment 2:
With reference to figure 3 and Fig. 4, the brick wall 2 in the present embodiment is not with constructional column, and fired common brick block is of a size of 240mm × 115mm × 53mm; Brick wall 2 length is 4.2m, is highly 3m, and thickness is 240mm; The sectional dimension of collar tie beam 1 is 340mm × 400mm; Other working procedures are all identical with embodiment one.
The present invention utilize the mechanical property advantage of high elongation fiber concrete and and brick masonry wall between good adhering performance, both larger horizontal active constraint power was produced to brick masonry wall, improve the shear strength of brick masonry wall, the globality of brick masonry wall can be improved again, the cracking of effective suppression brick masonry wall, greatly improve the deformability of brick masonry wall self, thus significantly improve stability and the anti-seismic performance of brick masonry wall, effectively alleviate the destructiveness of masonry structure under geological process.
On brick masonry wall, smear high elongation fiber concrete surface construction simple, easy to operate simultaneously, and the high elongation fiber concrete adopted has good durability, the application life of extending structure, reduce economy, social cost, reduce the work of repairing after even removing brick masonry wall macroseism from.
Claims (5)
1. a high elongation fiber concrete composite brick masonry wall, comprises brick masonry wall, it is characterized in that, be embedded with some bar dowels in the perpends of described brick masonry wall; Described brick masonry wall surface is coated with high elongation fiber concrete surface layer;
In described some bar dowels, the level interval of adjacent bar dowel and longitudinal pitch are 300mm, the diameter of every root bar dowel is 10 ~ 12mm, every root bar dowel degree of depth imbedded in brick masonry wall perpends is 100 ~ 150mm, and the length that brick masonry wall surface given prominence to by every root bar dowel is 20mm;
The thickness of described high elongation fiber concrete surface layer is 10 ~ 30mm;
The component of described high elongation fiber concrete is cement, flyash, silicon ash, sand, PVA fiber and water, wherein, by mass percentage, and cement: flyash: silicon ash: sand: water=1:0.9:0.1:0.76:0.58; Cumulative volume after mixing with cement, flyash, silicon ash, Sha Heshui is for radix, and the volume volume of PVA fiber is 1.5%.
2. high elongation fiber concrete composite brick masonry wall as claimed in claim 1, it is characterized in that, described cement is P.O.52.5R portland cement; Described flyash is I grade of flyash; The loss on ignition of described silicon ash is less than 6%, dioxide-containing silica is greater than 85%, specific area is greater than 15000m
2/ kg; The maximum particle diameter of described sand is 1.26mm; The length of described PVA fiber is 6 ~ 12mm, diameter is more than 26 μm, tensile strength is more than 1200MPa, modulus of elasticity is more than 30GPa.
3. high elongation fiber concrete composite brick masonry wall as claimed in claim 2, it is characterized in that, be added with the polycarboxylate water-reducer that water-reducing rate is more than 30% in described high elongation fiber concrete, and the addition of water reducing agent is 0.8% of flyash and cement gross mass.
4. high elongation fiber concrete composite brick masonry wall as claimed in claim 3, it is characterized in that, the preparation method of above-mentioned high elongation fiber concrete is: stirred by the water adding water reducing agent and 80% after cement, silicon ash, flyash and sand dry mixing evenly; Add the water adding residue 20% after PVA fiber stirs afterwards again stir and obtain high elongation fiber concrete.
5. a construction method for the high elongation fiber concrete composite brick masonry wall in claim 1-4 described in arbitrary claim, it is characterized in that, method is carried out in the steps below:
Step one, builds brick masonry wall by laying bricks or stones, and imbeds some bar dowels in the perpends of brick masonry wall;
Step 2, forms high elongation fiber concrete surface layer in the brick masonry wall surface trowelling high elongation fiber concrete laid, this high elongation fiber concrete surface layer by brick masonry wall and bar dowel coated.
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| KR101783460B1 (en) * | 2016-06-30 | 2017-10-12 | 저주 진 | Assembly type reinforcement block |
| CN108978936A (en) * | 2018-08-16 | 2018-12-11 | 庐江荣睿建设工程有限公司 | A kind of construction method of non-load bearing wall |
| CN111549937B (en) * | 2020-04-10 | 2021-08-10 | 哈尔滨工业大学 | Environment-friendly, heat-preservation and heat-insulation combined masonry wall structure and construction method thereof |
| CN112593531B (en) * | 2020-12-15 | 2021-07-30 | 中国矿业大学(北京) | Construction method of high-ductility wall-building protection underground reservoir artificial dam body structure |
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| CN101723620A (en) * | 2008-10-11 | 2010-06-09 | 沂源县建设工程质量监督站 | Polyvinyl alcohol fiber reinforced cement-based material composition and preparation method and application thereof |
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| RO112373B1 (en) * | 1995-03-23 | 1997-08-29 | Sofronie Ramoro | Reinforcement and consolidation process for the masonries with synthetic grates |
| CN101723620A (en) * | 2008-10-11 | 2010-06-09 | 沂源县建设工程质量监督站 | Polyvinyl alcohol fiber reinforced cement-based material composition and preparation method and application thereof |
| CN101775856A (en) * | 2009-05-14 | 2010-07-14 | 吴淑环 | Composite masonry wall |
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Application publication date: 20130206 Assignee: XI'AN WUHE CIVIL ENGINEERING NEW MATERIAL CO.,LTD. Assignor: XIAN University OF ARCHITECTURE AND TECHNOLOG Contract record no.: 2015610000084 Denomination of invention: High-ductility fiber concrete combined brick masonry wall and method for constructing same Granted publication date: 20150401 License type: Exclusive License Record date: 20150819 |
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Effective date of registration: 20181016 Address after: 710061 Xi'an 1501, room 15, Xi'an innovation and design center, 69 west section of Beilin District, Xi'an, China. Patentee after: XI'AN WUHE CIVIL ENGINEERING NEW MATERIAL CO.,LTD. Address before: 710055 No. 13, Yanta Road, Shaanxi, Xi'an Patentee before: XIAN University OF ARCHITECTURE AND TECHNOLOG |
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Address after: 710075 Room A-115-37, iChuangtu Maker Park, No. 14, Gaoxin 2nd Road, High-tech Zone, Xi'an City, Shaanxi Province Patentee after: Xi'an Wuhe New Material Technology Group Co.,Ltd. Address before: 710061 Xi'an 1501, room 15, Xi'an innovation and design center, 69 west section of Beilin District, Xi'an, China. Patentee before: XI'AN WUHE CIVIL ENGINEERING NEW MATERIAL CO.,LTD. |