CN100457413C - Concrete mortar interface processing method - Google Patents
Concrete mortar interface processing method Download PDFInfo
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- CN100457413C CN100457413C CNB2006100492478A CN200610049247A CN100457413C CN 100457413 C CN100457413 C CN 100457413C CN B2006100492478 A CNB2006100492478 A CN B2006100492478A CN 200610049247 A CN200610049247 A CN 200610049247A CN 100457413 C CN100457413 C CN 100457413C
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Abstract
The invention discloses an interface disposal method of concrete sand paste, which comprises the following steps: allocating the disposal agent of concrete sand paste interface into 1-20 density paste liquid; coating the paste liquid on the base material surface or back of ornament material to form 20-80 mu m interface layer; attaching or brushing through sand paste; or casting new concrete. The invention improves the adhesive action among new and old concrete, wall material and sand paste attaching or brushing layers, which saves the quantity of base material.
Description
(1) technical field
Invention relates to a kind of concrete mortar interface processing method, belongs to civil engineering material technical field.
(2) background technology
In civil engineering, there are a lot of common quality defects usually.As in the concrete structure repairing engineering, the interface bonding between mending concrete and the old concrete is relatively weaker, often just needs in two to three years to repair again.Switzerland shows the investigation of two bridge blocks, and the bridge floor of a bridge block after gunite concrete is repaired only 2 years, new-to-old concrete interface are thrown off and promptly reached 30～35%, and in only several weeks after repairing again, throw off once more at the position, many places; After the bridge floor of another bridge block is repaired only 8 months, patching material and old concrete be disengagement fully just.In architectural engineering, the application in body of wall strictly limits to traditional solid clay brick owing to government, and cast-in-place concrete is better owing to intensity height, dimensional stability, becomes building, especially the main flow of high-rise structure.Compare with traditional clay brick masonry, concrete surface hardness height, smooth, it is very difficult further to carry out sand finish after the concrete cast, coat of plaster is not easy constructing operation, and adhesion strength is very low between coat of plaster and the concrete base laminar surface, coat of plaster is dry simultaneously shrinks, and is easy to cause that cracking even coat of plaster peel off.When directly carrying out facing ornament materials such as plastering construction or sticking brick at smooth concrete surface, because adhesion strength is low, often be completed and only just the finish coat peeling phenomenon may occur in 1 year, ceiling plastering the accident that large tracts of land peels off occurs and also happens occasionally, this not only influences facade, and personal security is caused very big threat.
In order to improve the adhesion strength of concrete surface and coat of plaster, generally take concrete surface is cut a hole in advance the way of hair in the traditional handicraft, practice shows, because concrete strength is higher, cut a hole the hair construction to large-area building wall, it is consuming time not only to consume the worker, and uniformity is difficult to guarantee, and very big to the damage of concrete wall, its effect is also not obvious.
Discover that adopting concrete interface agent is the effective means of improving interfacial bond property.At present, multiple interface treating agent appears on the construction market, generally comprise two big classes: the compound interface treating agent of inorganic interface treating agent and organic-inorganic, the former is as a kind of flyash modified inorganic interface treating agent of developments such as University Of Shantou's bear light crystalline substance, in cement, add flyash as interfacial agents, can reduce Ca (OH)
2The formation of crystal improves the cohesive force at interface; Wuhan University of Technology defends the country in Shen and is developed into a kind of nano powder modified concrete on this basis and repairs inorganic interface treating agent, utilizes the high activity of nanoparticle, consumes portion C a (OH)
2, reduce the Ca (OH) that is unfavorable for the interface bonding
2Thick crystal forms and aligns, and nanoparticle is effectively filled the micropore that size is 10～100nm simultaneously, can reach the effect that increases substantially interfacial adhesion; The superpower inorganic agent of a kind of concrete interface of the latter such as the development of the Sun Zhen of university of Tongji University equality, form by cement, yellow ground, aluminium sulfate expanding agent, cellulose and polyvinyl acetate latex powder, wherein aluminium sulfate expanding agent act as compensate for shrinkage, prevent to produce shrinkage stress; Cellulosic effect is to prevent particles settling in the slurry, and plays water conservation and from the maintenance effect; Polymer emulsion is then brought into play the effect that strengthens toughness of products.
Yet, discover that adopt existing in the market commodity interface treating agent, when particularly inorganic interface treating agent carried out interface processing, its bond effect was often undesirable, its reason may be relevant with the using method that present commodity interface treating agent is recommended.Usually the recommendation using method of commodity interface treating agent is: mix by a certain percentage with cement, adding entry makes clean slurry or adds entry and sand is made mortar, with the concrete surface of starching only or mortar is coated in the needs repairing or wipes one's face, carry out the cast of novel concrete and the processing of wiping one's face of sprayed construction or mortar then.Though this construction method can be improved interfacial transition zone to a certain extent, improve interface binding intensity, still there are weak interfacial transition zone in final new-to-old concrete interface or concrete and mortar bonding interface.When adopting the compound interface treating agent of organic-inorganic to carry out interface processing, owing to add polymer and cellulose etc., though its interface bond effect is better, but its cost is very high, when adopting the using method of recommending to carry out interface processing, the interfacial agents use amount of unit matrix area is big, and the theoretical consumption of every square of matrix is up to 1～3kg, and the use cost of unit matrix area is too high have been limited it and apply.
(3) summary of the invention
In order to solve the deficiency that the inorganic agent cementation of prior art median surface is not good, cost is high, the invention provides the concrete mortar interface processing method that a kind of cementation is good, cost is low.
For reaching goal of the invention the technical solution used in the present invention be:
A kind of concrete mortar interface processing method, described method is that the slurries that the concrete mortar interface inorganic agent is mixed with mass concentration 1～20% are painted on the base material surface or the ornament materials back side, form the boundary layer of 20～80 μ m, paste with mortar again or whitewash construction, or carry out the cast of novel concrete.The slurries that preferably the concrete mortar interface inorganic agent are mixed with mass concentration 5～12% are painted on the base material surface or the ornament materials back side.
The main chemical compositions weight proportion is as follows in the described concrete mortar interface inorganic agent: CaO: Al
2O
3: SiO
2: Fe
2O
3: MgO=0.1～40: 0.1～30: 0.1～95: 0.1～5.0: 0.1～5.0, described concrete mortar interface inorganic agent is by the material with potential hydraulically active or volcanic ash, is 380～17000m through the specific area of dry grinding or wet-milling obtains
2The powder of/kg or oar body or lotion material.
Principle of the present invention is to be painted on the substrate material surface or the ornament materials back side by the dilute slurry with the concrete mortar interface inorganic agent, ultrafine particle in the slurries and/or nano particle can be penetrated into matrix material or ornament materials inside, with the common calcium hydroxide that absorbs the novel concrete that causes owing to " wall effect (wall effect) " or mortar in the substrate material surface enrichment of the interface coat that forms at substrate material surface or the ornament materials back side, pass through aquation, liquid phase or solid phase reaction, generation has the gelling thing than high bond strength, improves interface binding intensity.
Also containing weight in the described concrete mortar interface inorganic agent is described additive with material 0.1～10% of potential hydraulically active or volcanic ash, and described additive is one or more the mixture in anion surfactant, coupling agent, the colloidal sol.Described additive can add in described interface treating agent preparation process, also can add after the preparation or when using.
Described material with potential hydraulically active or volcanic ash is amorphization, decrystallized and/or controlled micro crystallization material, can be one of following or two or more mixture wherein: (1) 500 ℃～1000 ℃ calcining natural minerals (shale, clay, gangue), (2) nanometer SiO
2, (3) white carbon, (5) Ludox, (6) silica flour (density or non-density silica flour), (7) blast-furnace cinder, (8) slag, (9) boiling furnace slag, (10) flyash, (11) cullet, (12) natural volcanic ash, (13) zeolite, (14) phosphorus ore slag, (15) coal-burning boiler slag.
Described coal-burning boiler slag decrystallized and/or controlled micro crystallization is produced by adopting " adding the calcium method in the fuel " or " adding the calcium method in the lime-ash ", be that described coal-burning boiler slag is that to come from the coal be all types of industries boiler of fuel, comprise steam power plant, fluidized bed furnace, fluid bed, the Coal Chemical Industry boiler, by at coal dust, mix a certain amount of rich calcium substance in coal slurry or the coal cinder or in the lime-ash that after burning, discharges and (comprise quick lime, white lime and lime stone) and a spot of mineralizer (as iron powder, calcirm-fluoride), in tapping process or in the deslagging last handling process, through the high-temperature fusion operation, after making whole fusions of lime-ash or partial melting, the material of the decrystallized or controlled micro crystallization that cold through overrunning again (as air-cooled or shrend cooling) operation obtains.
Described anion surfactant is one of following or two or more mixture wherein: the lignosulfonates of (1) lignosulfonates, (2) modification, (3) naphthalene series high-efficiency water-reducing agent, (5) resin system high efficiency water reducing agent, (6) amido sulfoacid series high-efficiency water reducer, (7) pumping admixture, (8) fluidizing reagent.
Described coupling agent is silane coupler or aluminate coupling agent.
Described colloidal sol is Ludox or aluminium colloidal sol.
Described base material is one of following: 1. concrete, 2. fired brick (as common brick, sintered perforated brick, sintered hollow block, sintering shale brick, fire brick of colliery waste, fired fly ash brick), 3. no-firing brick (as autoclaved lime-sand brick, flyash brick, cinder brick), 4. building block (as air-entrained concrete building block, concrete small size hollow building block, small lightweight hollow concrete blocks, fly ash building block, Slag building block).
Described ornament materials is one of following: 1. the wall floor tile, 2. ceramic mosaic, 3. glazed interior tile, 4. terracotta, 5. water absorption rate is greater than 1.0% lithotome or artificial stone material.
The beneficial effect of concrete mortar interface processing method of the present invention is mainly reflected in: (1) can effectively improve the cementation between New-old concrete, materials for wall and mortar stickup or the rendering layer, prevents that hollowing from coming off; (2) the matrix material unit are is low-consuming, and the interface bonding is improved effective, has good popularization and application prospect.
(4) Figure of description
After Fig. 1 rolls over for the Mechanics Performance of Adherence of New interface of carrying out interface processing through different interface processing methods is anti-and destroys, the photo of the anti-plane of rupture of New-old concrete; 0: blank sample (being untreated); 1: low water-cement ratio paste is handled; 3: Ludox disperses the silica flour slurries to handle (embodiment 3);
Fig. 2 is moulding of concrete mortar bonding testing piece and shearing resistance test schematic diagram;
Fig. 3 is without interface processing (blank 2) with through the photo of the concrete mortar bonding testing piece shearing resistance section of interface processing (embodiment 9); A left side is interface processing not, and the right side is through embodiment 9 gained interface treating agent interface processing.
(5) specific embodiment
The present invention is described further below in conjunction with specific embodiment, but protection scope of the present invention is not limited in this:
Newly, the old concrete match ratio is cement: water: sand: stone=364: 200: 734: 1100, first moulding 40mm * 40mm * 160mm old concrete test specimen, natural curing cut into the thin slice that thickness is about 5mm after 60 days.
Prescription in the table 1 is pressed in the interface treating agent preparation, and dry grinding obtains dried powder after each mixing of materials, adds corresponding additive mixing again, adds water by the concentration of respective quality shown in the table 1 again and is mixed with slurries, and is standby.
The old concrete sheet surface is handled with different interface treating agent slurries (seeing Table 1), treat that the surface is air-dry after, be placed in the middle of 40mm * 40mm * 160mm die trial, then at both sides cast novel concrete.Behind Mechanics Performance of Adherence of New test specimen standard curing 7d, the 28d of moulding, adopt three-point bending method to measure rupture strength, span is 100mm.Result of the test sees Table 1.
After Fig. 1 rolls over for the Mechanics Performance of Adherence of New interface of carrying out interface processing through different interface processing methods is anti-and cuts destruction, the photo of the anti-plane of rupture of New-old concrete, can find have the visible attachment of naked eyes to exist without interface processing sample (blank) surface, but very not obvious; Through low water-cement ratio cement paste surface treatment sample (contrast 1) surface the visible attachment of more naked eyes is arranged, but surface irregularity, this is because the low water-cement ratio cement paste has higher intensity, and has higher bonding strength between the old concrete, but and the cohesive force between the novel concrete is low causes, show that the low water-cement ratio cement paste has some improvement to interfacial transition zone, but still can form interfacial transition zone between low water-cement ratio cement stone and the novel concrete, though therefore rupture strength increases, increase rate is limited.Disperse sample (embodiment 3) break surface after the silica flour slurry interface is handled to have obvious visible attachment to exist through Ludox, and attachment is evenly distributed, shows that its interface has obtained good improvement.
Embodiment 9～12:
The old concrete match ratio is a cement: water: sand: stone=400: 200: 600: 1200, and first moulding 100mm * 100mm * 100mm old concrete test specimen, natural curing cut into the thin slice that thickness is about 32mm after 180 days.
Prescription in the table 2 is pressed in the interface treating agent preparation, and each material and additive mix the back wet-milling and obtain moist powder, add water by the concentration of respective quality shown in the table 2 again and are mixed with slurries, and be standby.
The old concrete sheet surface is handled with different interface treating agent slurries (seeing Table 2), after treating that the surface is air-dry, be placed on 100mm * 100mm * 100mm die trial one side, as shown in Figure 2, at opposite side cast mortar, mortar mix ratio is a cement: water: sand=1: 0.50: 3.0 then.Survey shearing strength behind one group of nature of the concrete mortar bonding testing piece of moulding water curing 7d, behind another group nature water curing 7d, survey shearing strength when carrying out natural curing (relative humidity is 30%～60%) again to 28d.Result of the test sees Table 2.By table 2 as seen, during without interface processing, the concrete mortar bonding interface also has higher bonding strength under water curing 7d condition, but under dry curing condition thereafter, because mortar shrinks, concrete mortar bonding interface shearing-resistance ability sharply descends.(using method is: be mixed with cement paste with cement through low water-cement ratio paste and interface of powdered coal ash inorganic agent, the ratio of mud 0.30) after the processing, under water curing and the dry curing condition, concrete mortar bonding testing piece shear resistance all has a more substantial increase, but under the dry curing condition, its shear resistance is still lower.After interface treating agent of the present invention and interface processing method processing, under the dry curing condition, its shear resistance increases substantially, and compares with the wet curing condition, and the concrete mortar bonding testing piece shear resistance under the dry curing condition also descends to some extent, but fall is less.
Figure 2 shows that moulding of concrete mortar bonding testing piece and shearing resistance test schematic diagram; Figure 3 shows that without interface processing (blank 2) with through the photo of the concrete mortar bonding testing piece shearing resistance section of interface processing (embodiment 9), as seen blank 2 specimen surfaces do not have mortar and adhere to, and after the concrete mortar bonding interface of embodiment 9 destruction, concrete surface has tangible mortar to adhere to, show that interface treating agent of the present invention and using method can well improve interfacial adhesion, prevent that the screed hollowing from coming off.
Embodiment 13～14
Matrix material is an air-entrained concrete building block, is processed into the sheet test specimen of 100mm * 100mm * 32mm in advance; Prescription in the table 3 is pressed in the interface treating agent preparation, and each raw material mixes the back dry grinding and obtains dried powder, presses consumption shown in the table 3 again and adds additive and water, obtains the slurries of respective quality concentration, and is standby.
Air entrained concrete sheet test specimen surface is handled with different interface treating agent slurries (seeing Table 3), after treating that the surface is air-dry, be placed on 100mm * 100mm * 100mm die trial one side, at opposite side cast mortar, mortar mix ratio is a cement: water: sand=1: 1.25: 6.15 then.Survey shearing strength behind one group of nature of the concrete mortar bonding testing piece of moulding water curing 7d, behind another group water curing 7d, survey shearing strength when carrying out natural curing (relative humidity is 30%～60%) again to 28d.Result of the test sees Table 3.By table 3 as seen, after interface treating agent of the present invention and interface processing method processing, compare with unprocessed, under the dry curing condition, its shear resistance increases substantially, and is that air entrained concrete is broken bad during destruction.
Claims (10)
1. a concrete mortar interface inorganic agent is characterized in that the main chemical compositions weight proportion is as follows in the described concrete mortar interface inorganic agent: CaO: Al
2O
3: SiO
2: Fe
2O
3: MgO=0.1～40: 0.1～30: 0.1～95: 0.1～5.0: 0.1～5.0, described concrete mortar interface inorganic agent is by the material with potential hydraulically active or volcanic ash, is 380～17000m through the specific area of dry grinding or wet-milling obtains
2The powder of/kg or oar body or lotion material.
2. concrete mortar interface inorganic agent as claimed in claim 1, it is characterized in that also containing in the described concrete mortar interface inorganic agent weight is described additive with material 0.1～10% of potential hydraulically active or volcanic ash, and described additive is one or more the mixture in anion surfactant, coupling agent, the colloidal sol.
3. concrete mortar interface inorganic agent as claimed in claim 1 is characterized in that described material with potential hydraulically active or volcanic ash is one of following or two or more mixture wherein: (1) calcining natural minerals, (2) nanometer SiO
2, (3) white carbon, (5) Ludox, (6) silica flour, (7) blast-furnace cinder, (8) slag, (9) boiling furnace slag, (10) flyash, (11) cullet, (12) natural volcanic ash, (13) zeolite, (14) phosphorus ore slag, (15) coal-burning boiler slag, (16) calcining coal gangue.
4. concrete mortar interface inorganic agent as claimed in claim 2 is characterized in that described anion surfactant is one of following or two or more mixture wherein: the lignosulfonates of (1) lignosulfonates, (2) modification, (3) naphthalene series high-efficiency water-reducing agent, (5) resin system high efficiency water reducing agent, (6) amido sulfoacid series high-efficiency water reducer, (7) pumping admixture, (8) fluidizing reagent.
5. concrete mortar interface inorganic agent as claimed in claim 2 is characterized in that described coupling agent is silane coupler or aluminate coupling agent.
6. concrete mortar interface inorganic agent as claimed in claim 2 is characterized in that described colloidal sol is Ludox or aluminium colloidal sol.
7. concrete mortar interface processing method, it is characterized in that described method is: the slurries that the described concrete mortar interface inorganic agent of one of claim 1～6 is mixed with mass concentration 1～20% are painted on the base material surface or the ornament materials back side, form the boundary layer of 20～80 μ m, paste with mortar again or whitewash construction, or carry out the cast of novel concrete.
8. concrete mortar interface processing method as claimed in claim 7 is characterized in that described base material is one of following: 1. concrete, 2. fired brick, 3. no-firing brick.
9. concrete mortar interface processing method as claimed in claim 7 is characterized in that described ornament materials is one of following: 1. the wall floor tile, 2. ceramic mosaic, 3. glazed interior tile, 4. terracotta, 5. water absorption rate is greater than 1.0% lithotome or artificial stone material.
10. concrete mortar interface processing method as claimed in claim 7 is characterized in that described method is that the slurries that the concrete mortar interface inorganic agent is mixed with mass concentration 5～12% are painted on the base material surface or the ornament materials back side.
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| CNB2006100492478A CN100457413C (en) | 2006-01-24 | 2006-01-24 | Concrete mortar interface processing method |
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|---|---|---|---|
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| CN100457413C true CN100457413C (en) | 2009-02-04 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102746024B (en) * | 2011-08-08 | 2014-07-23 | 江苏尼高科技有限公司 | Special interface agent for composite foaming cement board, preparation method and external thermal insulation system thereof |
| CN102898107B (en) * | 2012-10-26 | 2014-12-03 | 苏州市姑苏新型建材有限公司 | Concrete healant |
| CN105298132A (en) * | 2015-09-22 | 2016-02-03 | 中国建筑第八工程局有限公司 | Construction method of super-high-rise core tube wall concrete structure |
| CN109879633B (en) * | 2019-04-15 | 2021-12-17 | 樊星 | Cement-based material interface modifier, preparation method, aggregate, reinforcing steel bar and application thereof |
| CN111892350B (en) * | 2020-07-03 | 2022-04-15 | 大连大学 | Method for improving flexural strength of cement mortar and concrete |
| CN111732366A (en) * | 2020-07-07 | 2020-10-02 | 四川恒泽建材有限公司 | Concrete interface treating agent and preparation method thereof |
| CN114163258B (en) * | 2021-12-27 | 2022-11-15 | 四川省川铁枕梁工程有限公司 | Method for enhancing concrete interface bonding force by graphene/graphene oxide and silica fume |
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| WO1997014664A1 (en) * | 1995-10-16 | 1997-04-24 | P & E. International Inc. | Method and agent for treating calcium-containing inorganic material |
| WO1998025865A1 (en) * | 1996-12-10 | 1998-06-18 | Fording Coal Limited | Surface treated additive for portland cement concrete |
| WO1998034888A1 (en) * | 1997-02-10 | 1998-08-13 | P & E. International Inc. | Agent and method for surface treatment of calcium-base inorganic members |
| CN1504308A (en) * | 2002-12-03 | 2004-06-16 | 王培武 | Water based interface agent |
| CN1559972A (en) * | 2004-03-04 | 2005-01-05 | 同济大学 | Super strong treatment agent for concrete interface |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997014664A1 (en) * | 1995-10-16 | 1997-04-24 | P & E. International Inc. | Method and agent for treating calcium-containing inorganic material |
| WO1998025865A1 (en) * | 1996-12-10 | 1998-06-18 | Fording Coal Limited | Surface treated additive for portland cement concrete |
| WO1998034888A1 (en) * | 1997-02-10 | 1998-08-13 | P & E. International Inc. | Agent and method for surface treatment of calcium-base inorganic members |
| CN1504308A (en) * | 2002-12-03 | 2004-06-16 | 王培武 | Water based interface agent |
| CN1559972A (en) * | 2004-03-04 | 2005-01-05 | 同济大学 | Super strong treatment agent for concrete interface |
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