CN105439514A - High-toughness mortar for reinforcing wall adopting old masonry structure - Google Patents
High-toughness mortar for reinforcing wall adopting old masonry structure Download PDFInfo
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- CN105439514A CN105439514A CN201510822894.7A CN201510822894A CN105439514A CN 105439514 A CN105439514 A CN 105439514A CN 201510822894 A CN201510822894 A CN 201510822894A CN 105439514 A CN105439514 A CN 105439514A
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- cement
- mineral admixture
- active mineral
- toughness
- mortar
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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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses high-toughness mortar for reinforcing a wall adopting an old masonry structure. The high-toughness mortar is characterized by comprising synthetic fibers with high elastic modulus, cement, an active mineral admixture, fine aggregate and water, wherein the active mineral admixture adopts fly ash or a mixture of the fly ash and mineral powder; when the active mineral admixture adopts the mixture of the fly ash and the mineral powder, the cement accounts for 40%-80% by mass, the fly ash accounts for 20%-40% by mass, and the mineral powder accounts for 0-20% by mass; the adding amount of the fine aggregate accounts for 50%-80% of the total mass of the cement and the active mineral admixture, and the adding amount of the water accounts for 32%-45% of the total mass of the cement and the active mineral admixture; the doping quantity of the synthetic fibers with high elastic modulus accounts for 1.4%-2.2% of the total volume of the high-toughness mortar. The mortar has high toughness and higher compressive strength, splitting-tension strength and breaking strength, additional reinforcement is not needed when the mortar is used for reinforcing the wall adopting the old masonry structure, the operation procedure is shortened, the strength is high, cracking is avoided, the construction period is shortened, and the integrity and the anti-seismic property of the masonry structure are improved effectively.
Description
Technical field:
The present invention relates to a kind of high-toughness mortar reinforced for old Masonry Wall, belong to material of construction and masonry bearing capacity technical field.
Background technology:
Masonry structure is because of the structure formation of advantage the becomes widespread use such as its simple structure, easy construction, cost be lower.But masonry structure is also because of immanent causes such as its component composition and mode of connection, and its tension, bending resistance, resistance to shear are all very low, very easily cause brittle rupture during earthquake action.Especially without the masonry structure of earthquake-resistant design, destroy even more serious in macroseism.Domestic and international all previous earthquake data show: the breaking-up of masonry structure building and to collapse be one of principal element of causing casualties.As 2008, Wenchuan earthquake middle and primary schools masonry schoolhouse damaged serious, and collapse in a large number, students in middle and primary schools suffer heavy losses, and bring the harrowing experience and memory of smearing and not going to us.According to the incomplete statistics after shake at that time, Sichuan stricken area teaching building collapses 93.7 ten thousand m
2, dead student 4664 people.And the School Buildings in earthquake region is mainly based on masonry structure, adds architectural large bay, gate window opening, choose corridor outward, sometimes even without anti-seismic construction measure, cause its anti-seismic performance poor.Therefore, study the seismic hardening how improving the old masonry house of multilayer and just there is very important practical significance.
At present, the design of old Masonry Wall transformation reinforcement means mostly is traditional whole of sand-cement slurry reinforcing mat reinforcing.Reinforcing steel net shell surface layer reinforcing wall, refer to the coat of plaster removing old masonry structure brick wall, reinforcing mat is set on surface, body of wall one or both sides, then sprays or smear high-grade cement mortar, to reach a kind of reinforcement means improving bearing capacity of wall body and ductility.Adopting S shape boring tension rib to drawing in metope during two-sided reinforcing, when one side is reinforced, adopting L-type structure anchor bar to be anchored in metope.Comprehensive experimental study both at home and abroad, adopts reinforcing steel net shell surface layer Strengthened Masonry Walls brick wall can improve the shear-carrying capacity of brick wall greatly, strengthens the ductility of structure, thus change the brittleness of brick wall.But above-mentioned masonry bearing capacity method increases more to structural weight, will the intrinsic characteristic of change structure; This reinforcement means adds structural member size simultaneously, decrease buildings usable floor area and construct loaded down with trivial details, the duration is long, in the building of some particular requirements, the increase of fabric structure scantling may produce considerable influence to equipment and using function.
Summary of the invention:
The object of the invention is to overcome the deficiency of above-mentioned prior art and provide one to have high tenacity (backfin is higher), higher ultimate compression strength, split tensile strength, folding strength and good energy dissipation capacity, for reinforced masonry wall without the need to arrangement of reinforcement, simplify working procedure, reduction of erection time, the bearing capacity of Masonry Wall and the high-toughness mortar reinforced for old Masonry Wall of anti-seismic performance can be significantly improved.
Object of the present invention can be reached by following measure: a kind of high-toughness mortar reinforced for old Masonry Wall, it is characterized in that it contains high-elastic mould synthon, cement, active mineral admixture, fine aggregate, water, water reducer and thickening material;
Wherein the mass percent of cement and active mineral admixture is: cement: 40% ~ 80%; Active mineral admixture: 20% ~ 60%;
Active mineral admixture adopts the mixture of flyash or flyash and breeze;
When active mineral admixture adopts the mixture of flyash and breeze, the mass percent of cement and flyash and breeze is: cement: 40% ~ 80%; Flyash: 20% ~ 40%; Breeze: 0 ~ 20%;
The add-on of fine aggregate is 50% ~ 80% of the total mass of cement and active mineral admixture;
Fine aggregate adopts quartz sand, and its specification is 60 ~ 100 orders;
The volume of water reducer is not more than 1% of cement and active mineral admixture total mass;
The volume of thickening material is not more than 0.05% of cement and active mineral admixture total mass;
The add-on of water is 32% ~ 45% of the ratio of the total mass of cement and active mineral admixture;
The volume of high-elastic mould synthon is 1.4% ~ 2.2% of high-toughness mortar cumulative volume;
It is the high-elastic modulus polyvinyl alcohol fibre of 0.015 ~ 0.055mm that high-elastic mould synthon select length to be 5mm ~ 15mm and diameter, and its indices is respectively: Young's modulus is 30 ~ 45GPa, tensile strength is 1000 ~ 2500MPa, elongation limit is 2% ~ 10%;
The volume of water reducer is not more than 1% of cement and active mineral admixture total mass;
The volume of thickening material is not more than 0.05% of cement and active mineral admixture total mass.
In order to realize object of the present invention further, described water reducer adopts poly carboxylic acid series water reducer.
In order to realize object of the present invention further, described thickening material adopts HPMC.
In order to realize object of the present invention further, when this high-toughness mortar is used for masonry bearing capacity, the high-toughness mortar that Masonry Wall answers both sides to smear this to reinforce for old Masonry Wall, the thickness being coated with float coat is 20 ~ 40mm.
The present invention can produce following positively effect compared with the prior art: the present invention is the reinforcing mortar for old Masonry Wall, it has high tenacity (backfin is higher), higher ultimate compression strength, split tensile strength and folding strength, ultimate compression strength is 10 ~ 50MPa, split tensile strength is 5 ~ 10MPa, and folding strength is 10 ~ 22Mpa.
When the present invention is used for the reinforcing of old Masonry Wall, body of wall both sides should be smeared evenly, and surface thickness controls at 20 ~ 40mm.Whole the reinforcing of itself and existing Masonry Wall reinforcing mode sand-cement slurry reinforcing mat is compared, and the advantage adopting high-toughness mortar to carry out reinforcing outstanding is:
1., without the need to extra arrangement of reinforcement, decrease the operation sequence such as boring, cloth muscle, the reduction of erection time.
2. intensity is high, does not ftracture, and can ensure construction quality, can with plaster be integrated.
3. greatly can improve the vertical bearing capacity of body of wall, play the effect strengthening wall integrity simultaneously, significantly strengthen the shock resistance of old masonry structure.
Embodiment:
Below the specific embodiment of the present invention is elaborated:
Embodiment 1: a kind of high-toughness mortar reinforced for old Masonry Wall, it contains synthon (selecting length to be 12mm and diameter is the high-elastic modulus polyvinyl alcohol fibre of 0.039mm, and its indices is respectively: Young's modulus is 42.8GPa, tensile strength is 1620MPa, elongation limit is 6%), cement (P. II 42.5), flyash (II grade), quartz sand (60 ~ 100 order), water reducer (liquid polycarboxylate water-reducer), thickening material (HPMC) and water.
Its proportioning is as follows:
The mass percent of cement and flyash is: cement (P. II 42.5) 80%, flyash (II grade) 20%;
The total mass ratio that quartz sand (60 ~ 100 order) add-on accounts for cement and flyash is 80%;
The volume of liquid polycarboxylate water-reducer is 1% of cement and active mineral admixture total mass;
The volume of HPMC is 0.05% of cement and active mineral admixture total mass;
The add-on of water is 45% of cement and active mineral admixture total mass;
High-elastic modulus polyvinyl alcohol fibre volume is 1.8% of high-toughness mortar cumulative volume.
As follows to the Mechanics Performance Testing in 28d length of time to this reinforcing Cement Mortar Used in Capital: ultimate compression strength is 44.5MPa, split tensile strength is 6.38MPa, folding strength is 17.1MPa, and the index tensile pressure ratio calculating reflection toughness is 1/7, and ultimate compression strength is 2.6 with the ratio (backfin ratio) of folding strength.And be 5.5 with the concrete backfin ratio of strength grade, therefore its toughness improves greatly.
Embodiment 2: a kind of high-toughness mortar reinforced for old Masonry Wall, it contains synthon (selecting length to be 5mm and diameter is the high-elastic modulus polyvinyl alcohol fibre of 0.015mm, and its indices is respectively: Young's modulus is 30GPa, tensile strength is 1000MPa, elongation limit is 2%), cement (P. II 42.5), flyash (II grade), breeze (S95), quartz sand (60 ~ 100 order), water reducer (liquid polycarboxylate water-reducer), thickening material (HPMC) and water; Clean water.
Its proportioning is as follows:
The mass percent of cement and flyash is: cement (P. II 42.5) 40%, flyash (II grade) 40%, breeze (S95) 20%;
The total mass ratio that quartz sand (60 ~ 100 order) add-on accounts for cement and flyash is 50%;
The volume of liquid polycarboxylate water-reducer is 0.32% of cement and active mineral admixture total mass.
The volume of HPMC is 0.05% of cement and active mineral admixture total mass;
The add-on of water is 32% of cement and active mineral admixture total mass;
High-elastic modulus polyvinyl alcohol fibre volume is 1.4% of high-toughness mortar cumulative volume.
As follows to the Mechanics Performance Testing in 28d length of time to this reinforcing Cement Mortar Used in Capital: ultimate compression strength is 44.6MPa, and folding strength is 25.7MPa.Calculating the index ultimate compression strength of reflection toughness with the ratio (backfin ratio) of folding strength is 1.7.And be 5.5 with the concrete backfin ratio of strength grade, therefore its toughness improves greatly.
Embodiment 3:
A kind of high-toughness mortar reinforced for old Masonry Wall, it contains synthon (selecting length to be 15mm and diameter is the high-elastic modulus polyvinyl alcohol fibre of 0.055mm, and its indices is respectively: Young's modulus is 45GPa, tensile strength is 2500MPa, elongation limit is 10%), cement (P. II 42.5), flyash (II grade), breeze (S95), quartz sand (60 ~ 100 order), water reducer (liquid polycarboxylate water-reducer), thickening material (HPMC) and water.
Its proportioning is as follows:
The mass percent of cement and flyash is: cement (P. II 42.5) 70%, flyash (II grade) 30%, breeze (S95) 10%;
The total mass ratio that quartz sand (60 ~ 100 order) add-on accounts for cement and flyash is 65%;
The volume of liquid polycarboxylate water-reducer is 0.3% of cement and active mineral admixture total mass.
The volume of HPMC is 0.03% of cement and active mineral admixture total mass;
The add-on of water is 38% of cement and active mineral admixture total mass;
High-elastic modulus polyvinyl alcohol fibre volume is 2.2% of high-toughness mortar cumulative volume.
As follows to the Mechanics Performance Testing in 28d length of time to this reinforcing Cement Mortar Used in Capital: ultimate compression strength is 25.8MPa, and folding strength is 17.4MPa.Calculating the index ultimate compression strength of reflection toughness with the ratio (backfin ratio) of folding strength is 1.5.And be 4 with the concrete backfin ratio of strength grade, thus its toughness improves greatly.
Embodiment 4:
A kind of high-toughness mortar reinforced for old Masonry Wall, it contains synthon (it is the high-elastic modulus polyvinyl alcohol fibre of 0.039mm that high-elastic mould synthon select length to be 12mm and diameter, and its indices is respectively: Young's modulus is 42.8GPa, tensile strength is 1620MPa, elongation limit is 6%), cement (P. II 42.5), flyash (II grade), breeze (S95), quartz sand (60 ~ 100 order), water reducer (liquid polycarboxylate water-reducer), thickening material (HPMC) and water.
Its proportioning is as follows:
The mass percent of cement and flyash is: cement (P. II 42.5) 40%, flyash (II grade) 40%, breeze (S95) 20%;
The total mass ratio that quartz sand (60 ~ 100 order) add-on accounts for cement and flyash is 80%;
The volume of liquid polycarboxylate water-reducer is 0.3% of cement and active mineral admixture total mass.
The volume of HPMC is 0.03% of cement and active mineral admixture total mass;
The add-on of water is 42% of cement and active mineral admixture total mass;
High-elastic modulus polyvinyl alcohol fibre volume is 1% of high-toughness mortar cumulative volume.
As follows to the Mechanics Performance Testing in 28d length of time to this reinforcing Cement Mortar Used in Capital: ultimate compression strength is 15.5MPa, and folding strength is 10.3MPa.Calculating the index ultimate compression strength of reflection toughness with the ratio (backfin ratio) of folding strength is 1.5.And be 3.5 with the concrete backfin ratio of strength grade, thus its toughness improves greatly.
Above embodiment is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determine.
Claims (4)
1., for the high-toughness mortar that old Masonry Wall is reinforced, it is characterized in that it contains high-elastic mould synthon, cement, active mineral admixture, fine aggregate, water, water reducer and thickening material;
Wherein the mass percent of cement and active mineral admixture is: cement: 40% ~ 80%; Active mineral admixture: 20% ~ 60%;
Active mineral admixture adopts the mixture of flyash or flyash and breeze;
When active mineral admixture adopts the mixture of flyash and breeze, the mass percent of cement and flyash and breeze is: cement: 40% ~ 80%; Flyash: 20% ~ 40%; Breeze: 0 ~ 20%;
The add-on of fine aggregate is 50% ~ 80% of the total mass of cement and active mineral admixture;
Fine aggregate adopts quartz sand, and its specification is 60 ~ 100 orders;
The volume of water reducer is not more than 1% of cement and active mineral admixture total mass;
The volume of thickening material is not more than 0.05% of cement and active mineral admixture total mass;
The add-on of water is 32% ~ 45% of the ratio of the total mass of cement and active mineral admixture;
The volume of high-elastic mould synthon is 1.4% ~ 2.2% of high-toughness mortar cumulative volume;
It is the high-elastic modulus polyvinyl alcohol fibre of 0.015 ~ 0.055mm that high-elastic mould synthon select length to be 5mm ~ 15mm and diameter, and its indices is respectively: Young's modulus is 30 ~ 45GPa, tensile strength is 1000 ~ 2500MPa, elongation limit is 2% ~ 10%;
The volume of water reducer is not more than 1% of cement and active mineral admixture total mass;
The volume of thickening material is not more than 0.05% of cement and active mineral admixture total mass.
2. a kind of high-toughness mortar reinforced for old Masonry Wall according to claim 1, is characterized in that described water reducer adopts poly carboxylic acid series water reducer.
3. a kind of high-toughness mortar reinforced for old Masonry Wall according to claim 1, is characterized in that described thickening material adopts HPMC.
4. a kind of high-toughness mortar reinforced for old Masonry Wall according to claim 1, when it is characterized in that this high-toughness mortar for masonry bearing capacity, the high-toughness mortar that Masonry Wall answers both sides to smear this to reinforce for old Masonry Wall, the thickness being coated with float coat is 20 ~ 40mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510822894.7A CN105439514A (en) | 2015-11-24 | 2015-11-24 | High-toughness mortar for reinforcing wall adopting old masonry structure |
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| CN201510822894.7A CN105439514A (en) | 2015-11-24 | 2015-11-24 | High-toughness mortar for reinforcing wall adopting old masonry structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477904A (en) * | 2022-02-16 | 2022-05-13 | 中国建筑科学研究院有限公司 | Cement-based high-ductility anti-seismic material for anti-seismic reconstruction of village and town buildings and preparation method thereof |
| CN114988810A (en) * | 2022-06-20 | 2022-09-02 | 长葛市金诺混凝土有限公司 | High-ductility cement-based composite material |
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|---|---|---|---|---|
| JPH08277157A (en) * | 1995-03-31 | 1996-10-22 | Chichibu Onoda Cement Corp | Concrete composition |
| CN101665342A (en) * | 2009-09-18 | 2010-03-10 | 徐世烺 | High-tenacity crack-control impervious fiber concrete |
| CN101857405A (en) * | 2010-06-17 | 2010-10-13 | 同济大学` | High-toughness mortar |
| CN101891417A (en) * | 2010-01-20 | 2010-11-24 | 沈阳美洋建设项目管理有限公司 | High-toughness polypropylene fiber reinforced cement-based composite material and preparation method thereof |
| CN102659371A (en) * | 2012-05-18 | 2012-09-12 | 江西博康特建材有限公司 | Polymer modified external wall heat insulation anti-crack mortar and preparation method of polymer modified external wall heat insulation anti-crack mortar |
| CN102936964A (en) * | 2012-11-04 | 2013-02-20 | 西安建筑科技大学 | Construction method of high elongation concrete embedded constructional column |
-
2015
- 2015-11-24 CN CN201510822894.7A patent/CN105439514A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08277157A (en) * | 1995-03-31 | 1996-10-22 | Chichibu Onoda Cement Corp | Concrete composition |
| CN101665342A (en) * | 2009-09-18 | 2010-03-10 | 徐世烺 | High-tenacity crack-control impervious fiber concrete |
| CN101891417A (en) * | 2010-01-20 | 2010-11-24 | 沈阳美洋建设项目管理有限公司 | High-toughness polypropylene fiber reinforced cement-based composite material and preparation method thereof |
| CN101857405A (en) * | 2010-06-17 | 2010-10-13 | 同济大学` | High-toughness mortar |
| CN102659371A (en) * | 2012-05-18 | 2012-09-12 | 江西博康特建材有限公司 | Polymer modified external wall heat insulation anti-crack mortar and preparation method of polymer modified external wall heat insulation anti-crack mortar |
| CN102936964A (en) * | 2012-11-04 | 2013-02-20 | 西安建筑科技大学 | Construction method of high elongation concrete embedded constructional column |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477904A (en) * | 2022-02-16 | 2022-05-13 | 中国建筑科学研究院有限公司 | Cement-based high-ductility anti-seismic material for anti-seismic reconstruction of village and town buildings and preparation method thereof |
| CN114988810A (en) * | 2022-06-20 | 2022-09-02 | 长葛市金诺混凝土有限公司 | High-ductility cement-based composite material |
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Application publication date: 20160330 |