CN111792892A - Method for building or reinforcing masonry wall by using UHMWPE cement-based mortar - Google Patents
Method for building or reinforcing masonry wall by using UHMWPE cement-based mortar Download PDFInfo
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- CN111792892A CN111792892A CN202010593398.XA CN202010593398A CN111792892A CN 111792892 A CN111792892 A CN 111792892A CN 202010593398 A CN202010593398 A CN 202010593398A CN 111792892 A CN111792892 A CN 111792892A
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- mortar
- cement
- uhmwpe
- masonry wall
- masonry
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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
- C04B28/04—Portland cements
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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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
- 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
- C04B2111/00482—Coating or impregnation materials
- C04B2111/00508—Cement paints
Abstract
The invention relates to a method for building or reinforcing a masonry wall by using UHMWPE cement-based mortar, which uses the UHMWPE fiber cement-based mortar to replace part of common mortar in a horizontal mortar joint of the masonry wall to form a continuous UHMWPE fiber cement-based mortar space grid. Compared with the prior art, the invention is suitable for building and reinforcing various masonry walls, improves the bearing capacity of the masonry walls, and simultaneously improves the anti-permeability capacity and the brick joint durability of the inner wall and the outer wall.
Description
Technical Field
The invention belongs to the technical field of buildings, and particularly relates to a method for building or reinforcing a masonry wall by using UHMWPE cement-based mortar.
Background
Masonry structures are widely used in building structures due to the characteristics of simple conditions required for masonry, convenience in construction and the like. However, the traditional masonry structure has the characteristic of typical brittle failure, and when the traditional masonry structure is subjected to shearing force in an earthquake, the traditional masonry structure is often damaged by a single or a plurality of oblique main cracks extending along mortar joints. Because the shearing resistance of the common mortar is lower, the structural integrity is low, and the seismic performance is lower.
The patent of publication No. CN209509559U discloses a reinforcement and appearance protection integrated structure of a plain brick wall, wherein a reinforcing mesh is arranged on the inner side surface of the brick wall, a mortar surface layer is filled on the reinforcing mesh, caulking reinforcement is carried out on the outer side surface of the brick wall, and polymer mortar is filled in each brick joint after removing original deteriorated mortar, so that the integrity, the earthquake resistance and the bearing capacity of the ancient plain brick wall are improved.
The publication number CN102912892B discloses a high-ductility fiber concrete combined brick masonry wall and a construction method thereof, which are used for solving the problems of fragility, poor anti-seismic performance and poor integrity of the existing common brick masonry wall.
Disclosure of Invention
The invention aims to solve the defects of the existing brick wall construction and reinforcement method, and provides a novel method for constructing or reinforcing a masonry wall by using UHMWPE cement-based mortar.
The purpose of the invention is realized by the following technical scheme:
a method for building or reinforcing masonry wall by using UHMWPE cement-based mortar is characterized in that UHMWPE fiber cement-based mortar is used for replacing part of common mortar in horizontal mortar joints of the masonry wall to form continuous UHMWPE fiber cement-based mortar space grids.
The principle is that the characteristics of a aragonite layer and an interlaminar protein organic substance layer of the bionic shell nacre are utilized, a building block layer is regarded as the aragonite layer, UHMWPE fiber cement-based mortar is used as a tensile reinforcement material to be added into mortar joints of a masonry wall, and the UHMWPE fiber cement-based mortar is combined with internal common mortar to form a net-shaped structure similar to the protein organic substance layer. When the crack of the masonry wall is subjected to various external forces (including earthquakes), the crack of the masonry wall is blocked and separated by the continuous UHMWPE fiber cement-based mortar layer, and the crack is induced to deflect and branch between layers, so that the effects of strengthening and toughening are achieved, and the shell-like high toughness and high ductility are achieved. The invention is suitable for building and reinforcing various masonry walls, can improve the anti-seismic bearing capacity of the masonry walls, and simultaneously improves the anti-permeability capacity and the brick joint durability of the inner wall and the outer wall.
Preferably, the building blocks of the masonry wall are common solid building blocks or hollow building blocks for buildings.
Preferably, the base material of the UHMWPE fiber cement-based mortar is cement mortar, and the chopped UHMWPE fibers are incorporated.
Preferably, the tensile strength of the UHMWPE fiber cement-based mortar is more than 2MPa, and the axial tensile elongation is not less than 3%.
Preferably, the cement mortar comprises 800 parts of 400-plus-cement, 800 parts of 400-plus-fly ash, 800 parts of 400-plus-sand, 0-200 parts of silica fume, 2-15 parts of a water reducing agent and 400 parts of 180-plus-water.
Preferably, the amount of the chopped UHMWPE fibers is 0.5-3% of the total volume of the cement mortar.
Preferably, the ratio of the thickness of the horizontal mortar joint of the masonry wall to the distance between the two horizontal mortar joints is 0.1-0.5, in the vertical direction, the UHMWPE fiber cement-based mortar is applied at intervals of 1-3 horizontal mortar joint layers, but continuous UHMWPE fiber cement-based mortar horizontal mortar joints must be formed in a single layer.
Preferably, the ratio of the width of the vertical mortar joint of the masonry wall to the wall thickness is 0.05-0.2.
Preferably, the specific steps are as follows:
(1) preparing UHMWPE fiber cement-based mortar;
(2) reserving partial horizontal mortar joints on the inner side and the outer side of a newly-built masonry wall every one or a plurality of masonry layers, or removing common mortar of the horizontal mortar joints on the inner side and the outer side of the original masonry wall;
(3) the prepared UHMWPE fiber cement-based mortar is integrally arranged or filled into a horizontal mortar joint of a masonry wall through manpower or machinery to form a continuous horizontal mortar layer or a mortar strip;
(4) and (5) watering and maintaining to complete the building or reinforcing of the masonry wall.
In the newly-built masonry wall in the step (2), the width of the horizontal mortar joint of the UHMWPE cement-based mortar can be equal to the wall thickness, and when the original masonry wall is reinforced, the depth of the single-side caulking joint is 30-80 mm;
and (3) accurately controlling the uniformity and the plumpness of mortar filling, and strictly keeping the continuity of the horizontal mortar joint.
The mechanism of the invention is (see in particular fig. 8, 9): the traditional masonry mortar layer has obvious brittleness and insufficient tensile property, and cannot provide necessary restraint and reinforcement for the building block layers on two sides.
The traditional masonry is easy to have single crack type linkage damage, so that the deformation capability and the energy consumption capability are poor. By adopting the method, after the UHMWPE fiber cement-based mortar is arranged between the building block layers, a certain layer of building block reaches cracking strain under the action of load, and interlayer interlocking and microcracks occur. Due to the delamination, the cracks deflect and diverge (disperse) at the block layer boundaries, eliminating the stress concentration at the crack tip, and the next block must again reach the initiation strain before cracking. The crack deflection relieves the zipper type damage caused by stress concentration of a crack tip, remarkably improves the fracture toughness of the material, and enhances the deformation capability and the energy consumption capability of the material by crack dispersion.
Compared with the prior art, the invention has the beneficial effects that:
1. the method of replacing common mortar with UHMWPE fiber cement-based mortar is adopted on the inner side and the outer side of the brick masonry, and the deformation capability and the energy consumption capability of the brick wall are improved through bionics, so that the shock resistance and the bearing capacity of the brick wall are improved.
2. The UHMWPE fiber cement-based mortar caulking reinforcement can obviously improve the anti-permeability capability of brick joints of inner and outer walls and the corrosion resistance of the brick joints.
3. Compared with the construction method which directly uses UHMWPE fiber cement-based mortar for masonry, the construction method of the UHMWPE fiber cement-based mortar caulking reinforced masonry wall can greatly save mortar materials.
Drawings
FIG. 1 is a schematic front and side view of a masonry wall according to example 1;
FIG. 2 is a schematic illustration of caulking plugs for masonry walls according to example 1;
FIG. 3 is a schematic view of a loading experiment of masonry;
FIG. 4 is a schematic view of the bearing capacity of a reinforced wall and an unreinforced wall;
FIG. 5 is a schematic structural view of a masonry wall according to example 2;
FIG. 6 is a schematic representation of the construction of the block used in masonry wall of example 2;
FIG. 7 is a schematic view of the bearing capacity of a bionic brick wall and a common brick wall;
fig. 8 and 9 are schematic diagrams of masonry wall mechanisms.
In the figure: 1-solid or hollow blocks; 2-caulking; 3-vertical mortar joint; 4-horizontal mortar joint.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
In this embodiment, the height, width and thickness of the masonry wall to be reinforced are 998mm, 990mm and 240mm, the vertical mortar joint used for the masonry wall is ordinary M5 cement lime mortar, and the masonry mode is an up-down staggered joint mode, as shown in fig. 1.
The UHMWPE fiber cement-based mortar used in this example had a tensile strength of 5MPa, a strain corresponding to the maximum tensile strength of 6%, and a compressive strength of 30 MPa.
The bricks used in the masonry wall of the embodiment are solid clay bricks, and the sizes of the bricks are 240mm multiplied by 115mm multiplied by 53 mm.
The method for reinforcing the masonry wall by the UHMWPE fiber cement-based mortar caulking comprises the following steps:
(1) and removing a layer of horizontal common mortar on the inner side and the outer side of the masonry wall to be reinforced, blowing or flushing dust at the brick joints by compressed air, wherein the joint cleaning depth is 30 mm.
(2) Preparing UHMWPE fiber cement-based mortar, which comprises the following steps:
(a) adding 600 parts of ordinary portland cement, 550 parts of fly ash and 650 parts of sand into a stirrer, and stirring the dry powder for 2-3 minutes so as to uniformly mix the materials;
(b) adding a mixed liquid of 4 parts of water reducing agent and 220 parts of water, and stirring for 5-6 minutes to make the dry powder into slurry;
(c) 15 parts of fibers are added in batches and stirred for 5-10 minutes to ensure that the fibers are uniformly dispersed;
(3) filling the prepared UHMWPE fiber cement-based mortar into a caulking joint, pointing the outer side of the mortar, spraying an interface agent, and repeating the process until the caulking depth is 30mm, thereby finally completing the reinforcement of the masonry wall.
(4) And carrying out mortar watering maintenance on the reinforced masonry wall for 7 days.
Fig. 2 is a schematic diagram of caulking filling of a masonry wall in example 1, wherein horizontal mortar joints 4 are arranged between solid blocks 1, and UHMWPE fiber cement-based mortar is filled at the caulking joints 2.
FIG. 3 is a schematic diagram of a standard low cycle repeated loading test, through the test shown in FIG. 3, the lateral bearing capacity of the reinforced and unreinforced wall can be obtained, and as shown in FIG. 4, it can be seen that the bearing capacity of the wall processed by the method is obviously improved.
Example 2
The UHMWPE fiber cement-based mortar used in this example had a tensile strength of 8MPa, a strain corresponding to the maximum tensile strength of 5%, and a compressive strength of 50 MPa.
The bricks used in the masonry wall of this example are porous clay bricks having dimensions of 240mm by 115mm by 90mm, as shown in FIG. 6.
The vertical mortar joint mortar used for the masonry wall is ordinary M5 cement lime mortar, and the masonry mode is an up-down staggered joint mode.
The construction method of the UHMWPE fiber cement-based mortar caulking reinforced masonry wall comprises the following steps:
(1) the middle part is built by adopting common mortar, and 50mm is reserved at two sides respectively.
(2) Preparing UHMWPE fiber cement-based mortar, which comprises the following steps:
(a) adding 600 parts of ordinary portland cement, 400 parts of fly ash, 150 parts of silica fume and 650 parts of sand into a stirrer, and stirring the dry powder for 2-3 minutes so as to uniformly mix the materials;
(b) adding a mixed liquid of 4 parts of water reducing agent and 200 parts of water, and stirring for 5-6 minutes to make the dry powder into slurry;
(c) adding 20 parts of fibers in batches, and stirring for 5-10 minutes to ensure uniform dispersion of the fibers;
(3) and extruding the prepared UHMWPE fiber cement-based mortar on two sides of the common mortar through a machine tool, wherein the width of the prepared UHMWPE fiber cement-based mortar is 50 mm. And repeating the process, and finally finishing the reinforcement of the masonry wall.
(4) And carrying out mortar watering maintenance on the reinforced masonry wall for 7 days.
Fig. 5 is a schematic diagram of caulking and filling of a masonry wall in example 2, in the diagram, continuous horizontal mortar joints 4 made of UHMWPE fiber cement-based mortar are arranged between blocks 1, and vertical mortar joints 3 are arranged between the blocks, and through the test shown in fig. 3, the lateral bearing capacity of the bionic brick masonry wall and the normal brick masonry wall can be obtained, and as shown in fig. 7, it can be seen that the bearing capacity of the wall body processed by the method is obviously improved.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A method for building or reinforcing masonry wall by using UHMWPE cement-based mortar is characterized in that the common mortar in horizontal mortar joints of the masonry wall is replaced by continuous UHMWPE fiber cement-based mortar to form a continuous UHMWPE fiber cement-based mortar space grid.
2. The method for constructing or reinforcing masonry wall using UHMWPE cement based mortar according to claim 1 wherein said masonry wall blocks are ordinary solid blocks or hollow blocks for construction.
3. The method of claim 1, wherein the substrate of the UHMWPE fiber cement-based mortar is cement mortar and the chopped UHMWPE fibers are incorporated.
4. The method of claim 3, wherein the UHMWPE fibre cement based mortar has a tensile strength of greater than 2MPa and an axial tensile elongation of not less than 3%.
5. The method for constructing or reinforcing the masonry wall by using the UHMWPE cement-based mortar as claimed in claim 3, wherein the cement mortar comprises 800 parts of 400-fold cement, 800 parts of 400-fold fly ash, 800 parts of 400-fold sand, 0-200 parts of silica fume, 2-15 parts of water reducing agent and 400 parts of 180-fold water.
6. The method for constructing or reinforcing masonry wall using UHMWPE cement based mortar according to claim 5, characterised in that the chopped UHMWPE fibres are incorporated in an amount of 0.5-3% of the total volume of the cement mortar.
7. The method for building or reinforcing masonry wall with UHMWPE cement-based mortar according to claim 1, characterised in that the ratio of the thickness of the horizontal mortar joints of the masonry wall to the distance between two horizontal mortar joints is between 0.1 and 0.5, and that the UHMWPE fibre cement-based mortar is applied once every 1 to 3 horizontal mortar joint layers in the vertical direction, but that within a single layer a continuous horizontal mortar joint of the UHMWPE fibre cement is formed.
8. The method for constructing or reinforcing masonry wall using UHMWPE cement-based mortar according to claim 1, characterised in that the ratio of the width of the vertical mortar joints to the wall thickness of the masonry wall is between 0.05 and 0.2.
9. The method for constructing or reinforcing masonry walls using UHMWPE cement based mortar according to claim 1, characterised by the specific steps of:
(1) preparing UHMWPE fiber cement-based mortar;
(2) reserving partial horizontal mortar joints on the inner side and the outer side of a newly-built masonry wall every one or a plurality of masonry layers, or removing common mortar of the horizontal mortar joints on the inner side and the outer side of the original masonry wall;
(3) the prepared UHMWPE fiber cement-based mortar is integrally arranged or filled into a horizontal mortar joint of a masonry wall through manpower or machinery to form a continuous horizontal mortar layer or a mortar strip;
(4) and (5) watering and maintaining to complete the building or reinforcing of the masonry wall.
10. A method of constructing or reinforcing masonry walls using UHMWPE cement based mortar according to claim 9,
in the newly-built masonry wall in the step (2), the width of the horizontal mortar joint of the UHMWPE cement-based mortar can be equal to the wall thickness, and when the original masonry wall is reinforced, the depth of the single-side caulking joint is 30-80 mm;
and (3) accurately controlling the uniformity and the plumpness of mortar filling, and strictly keeping the continuity of the horizontal mortar joint.
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| CN202010593398.XA CN111792892A (en) | 2020-06-27 | 2020-06-27 | Method for building or reinforcing masonry wall by using UHMWPE cement-based mortar |
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| CN202010593398.XA CN111792892A (en) | 2020-06-27 | 2020-06-27 | Method for building or reinforcing masonry wall by using UHMWPE cement-based mortar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114163188A (en) * | 2021-11-26 | 2022-03-11 | 甘肃中研同创材料科技有限责任公司 | High-ductility caulking reinforcing daub and preparation method thereof |
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2020
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| KR100804682B1 (en) * | 2006-09-05 | 2008-02-18 | 서경원 | Mortar with hybrid fibers and method for construction using the same |
| CN103924792A (en) * | 2014-05-06 | 2014-07-16 | 北京筑福建筑事务有限责任公司 | Method of replacing mortar in mortar joint for masonry structure reinforcement |
| CN105421811A (en) * | 2015-12-17 | 2016-03-23 | 北京筑福建筑事务有限责任公司 | Quincuncial mortar joint mortar reinforced masonry structure and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114163188A (en) * | 2021-11-26 | 2022-03-11 | 甘肃中研同创材料科技有限责任公司 | High-ductility caulking reinforcing daub and preparation method thereof |
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