CN101787672A - Method for repairing concrete crack with multi-cracking cement-based composite - Google Patents

Method for repairing concrete crack with multi-cracking cement-based composite Download PDF

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CN101787672A
CN101787672A CN 201010109639 CN201010109639A CN101787672A CN 101787672 A CN101787672 A CN 101787672A CN 201010109639 CN201010109639 CN 201010109639 CN 201010109639 A CN201010109639 A CN 201010109639A CN 101787672 A CN101787672 A CN 101787672A
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crack
concrete
cement
based composite
slurry
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徐世烺
王冰
李贺东
蔡向荣
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Hangzhou Guhua Composite Material Technology Co Ltd
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Dalian University of Technology
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5076Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with masses bonded by inorganic cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/72Repairing or restoring existing buildings or building materials

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Abstract

The invention belongs to the technical field of concrete reinforcement and relates to a method for repairing a concrete crack, which uses multi-cracking cement-based composite to be covered on the outer surface of the concrete as a repairing layer and is characterized in that firstly, the periphery of the crack on the outer surface of the concrete is polished smooth or an isolating layer is arranged, and then the multi-cracking cement-based composite slurry is poured or a thin layer of slurry is poured first and then a precast slab is covered; and the weight ratio of components of the multi-cracking cement-based composite is that: cement: water: fine aggregate: fly ash: silicon ash: granulated blast furnace slag: metakaolin =1:(0.27-2.2):(0-3):(0-6.9):(0-0.3):(0-0.55):(0-0.4), and fiber of which the volume accounts for 1-3% of the total volume of the composite is also blended. The repairing layer leads the width of the crack to be less than 0.05mm under the action of the external shrinkage stress, can prevent the forming of penetrating cracks and can be widely used for repairing concrete structure cracks of concrete pavement, airport runways, anti-cracking belt of dam and bridge surface plate.

Description

A kind of usefulness is stitched the method in cracking cement-based composite mending concrete crack more
Technical field
The invention belongs to concrete enhancing technical field, relate to utilization can produce many seams cracking cement-based composite mending concrete crack in many fine and closely woven cracks under the tensile load effect method.
Background technology
General distress in concrete repairing technique commonly used is with old concrete cutter hair, adopts the repairings of wiping one's face such as mortar, fibrous concrete.But because patching material tensile strength such as mortar, fibrous concrete are less; repair layer is easy to crack; and form the bigger major fracture of width that runs through the old concrete crack, and cause harmful corrosive substance to infiltrate the old concrete inside configuration, can not fully realize the purpose of crack arrest, protection building structure.
Many seam cracking cement-based composites are a kind of comparatively desirable concrete reinforcement reinforcement materials, also can be referred to as many seam cracking strain hardening cement-base composite materials, be meant the cement-base composite material that under the tensile load effect, can produce many fine and closely woven cracks, it is a kind of cement-base composite material that uses short fiber to strengthen, has significant strain hardening feature after the sclerosis, ultimate tensile strength reaches more than 1%, under the tensile load effect, can produce many minute cracks, the average crack width of corresponding test specimen was below 0.1mm when directly tensile load reached peak value, the crack width that is produced by shrinkage stress can satisfy the requirement for restriction of many engineerings to innoxious crack width generally all less than 0.05mm.
According to prior art; the composition that many seam cracking cement-based composites adopt has cement, water, fiber, meticulous aggregate, active mineral admixture (one or more in flyash, silicon ash, granulated blast-furnace slag, the metakaolin), and the minimum value of the components by weight percent of wherein meticulous aggregate and active mineral admixture can be 0.
People such as Fukuda in 2004 are published in Proc.of the Japan Concrete Institute (Japanese concrete association collection of thesis, 26 volumes, the 2nd phase, the 1693-1698 page or leaf) proportioning that has provided a kind of many seam cracking cement-based composites in the article " Effect of ECC OverlayReinforcement Method on Steel Plate Deck Attached with FRP Dowels " is (concrete and coal ash): water: husky=1: 0.422: 0.7 (weight ratio), vinal content is 2%.
People such as Maalej were published in Journal of Materials in Civil Engineering (17 volumes in 2005, the 2nd phase, the 143-152 page or leaf) proportioning that has provided a kind of many seam cracking cement-based composites in the article " Behavior of Hybrid-Fiber Engineered CementitiousComposites Subjected to Dynamic Tensile Loading and Projectile Impact " is a cement: water: silicon ash: water reducing agent=1: 0.28: 0.1: 0.02 (weight ratio), polyethylene fibre volume are 1.5% of total composite volume.
Application number is the Chinese patent of 200510046878.X, a kind of proportioning with cement-base composite material of many seam cracking properties is disclosed in an embodiment, each weight ratio of constituents is a cement: water: sand: flyash: water reducing agent=1: 0.56: 0.8: 1.2: 0.032, the fiber volume volume was 2%.
Existing mending concrete crack technology, be after grouting treatment is carried out in the old concrete crack, old concrete repairing face is cut a hole hair, to strengthen the interface binding intensity between the New-old concrete, cover one deck patching material again, but because general lower anti-crack ability and the single crack destruction characteristic of patching material (ordinary mortar, epoxy mortar, concrete, fibrous concrete etc.), repair layer is in case cracking just easily forms major fracture.When using above-mentioned many seam cracking cement-based composites to do patching material, this material possesses the microcraking pattern of many fine and closely woven crackles, and the crack width that produces than other patching materials is little, also finer and closely woven; But because under extraneous load and thermal stresses effect, there is bigger stress in the old concrete crack periphery, cause the stress of upper end, crack repair layer to concentrate easily, produce the penetrability major fracture, the destruction that finally causes repair layer.Therefore to the repairing of distress in concrete, not only need to have the patching material of better cracking resistance, and need to slow down and prevent to form the method for repairing and mending of penetrability major fracture.
Summary of the invention
The method that the purpose of this invention is to provide a kind of many seam cracking cement-based composite mending concretes crack, can bring into play the crack dispersibility of material better, make the repair layer crack fine and closely woven, prevent that new repair layer from forming the penetrability major fracture, the structure after the repairing can reach the requirement of harmless crack.
The objective of the invention is to be achieved through the following technical solutions.
A kind of usefulness is stitched the method in cracking cement-based composite mending concrete crack more, adopt many seam cracking cement-based composites to cover the concrete external surface as repair layer, many seam cracking cement-based composites reach more than 1% in the stretching strain of tensile load effect limit inferior, can produce many fine and closely woven cracks, the invention is characterized in, before the many seams of cast cracking cement-based composite, concrete external surface crack periphery is polished smooth or is provided with separation layer, to weaken or to eliminate adhesion strength between crack periphery concrete and the many seam cracking cement-based composites; Cover the mode of precast plate after adopting the cast slurry or pouring into a mould the skim slurry earlier, will stitch cracking cement-based composite more and cover the concrete external surface; The weight ratio of each composition that the many seams cracking cement-based composite that is adopted comprises is:
Cement: water: meticulous aggregate: flyash: silicon ash: granulated blast-furnace slag: metakaolin=1: (0.27~2.2): (0~3): (0~6.9): (0~0.3): (0~0.55): (0~0.4) also contains the fiber that volume is a total composite volume 1%~3%, and the particle diameter of meticulous aggregate is less than or equal to 0.6mm.
Concrete external surface crack periphery polish smooth or be provided with separation layer scope can for: externally extend 5~80mm from the crack periphery all directions, optimum range is 5~50mm.
Adopt when the cast skim is stitched the mode of cracking cement-based composite slurry, the many seams of back covering cracking cement-based composite precast plates more earlier, slurry is as the glue-line of pasting precast plate.Before covering precast plate, can the one side that precast plate and cast slurry is bonding coat the same slurry of skim in advance, make the precast plate after the covering combine firmly no hole with slurry.
The bonding surface of precast plate and slurry can be the plane, also can be corrugated surface or other male and fomale(M﹠F)s, to increase preform surfaces frictional force, strengthens the cementitiousness between prefabricated component and the concrete.
Make when stitching cracking cement-based composite more; the components by weight percent of meticulous aggregate, flyash, silicon ash, granulated blast-furnace slag, metakaolin preferably is not 0 simultaneously; can also add chemical admixtures such as water reducing agent, defoamer, air entraining agent, thickener, methylcellulose as required in right amount, its usage is identical with making ordinary concrete or general fibre concrete with consumption.
Fiber can adopt polyethylene fibre, vinal, aramid fiber, alkali-resistant glass fibre, carbon fiber, aromatic polyamide fibre, steel fibre, polypropylene fibre, Kevlar fabric, one or more multiple combinations such as spectrum fiber.
Separation layer can adopt plastic sheeting, adhesive waterproof tape, tarpaulin paper, waterproofing materials film, Kapton Tape, insulation materials, electric insulation adhesive tape etc. thin and and concrete between the more weak material of bonding.
Determination experiment by the distress in concrete repair efficiency proves, adopt many seam cracking cement-based composite mending concretes crack, when being subjected to extraneous load, its destructive process is repair layer and old concrete generation interface peel before this, produce the material crack then, material crack and crack, interface alternately occur.Along with the further growth of extraneous load, the material crack increases, based on the material cracking, the crack, interface is expanded slow gradually, and the expansion in crack, interface finally is to be controlled by the strength of materials of repair layer, when reaching capacity intensity, the material tensile strength that reaches capacity, crack, interface also stop expansion.At this moment material enters crack localization extension phase, forms major fracture gradually, and the crack, interface is no longer expansion, along with the material crack width constantly increases, and repair layer generation final fracture.The fractue spacing scopes of many seam cracking cement-based composite repair layer are by the control of interface peel length, peel off longly more, and repair layer material fractue spacing scope is big more.Concrete surface is handled smooth, to weaken the interface binding intensity between repair layer and the concrete, fracture propagation length in interface increases, can increase the amount of deflection and the ductility of repair layer and composite concrete structure, stress energy mean allocation is on repair layer, the more consumes of energy are postponed the crack and are embedded in the patching material in the fracture propagation of interface under the equal loading condition.Therefore the repair layer on the smooth surface concrete is better than the repair layer crack dispersion effect on the rough surface concrete.
Therefore, by polish smooth or be provided with the zone of separation layer at concrete external surface crack periphery, weaken or eliminate adhesion strength between crack periphery concrete and the many seam cracking cement-based composites, load is redistributed in the influence that repair layer is not concentrated by former distress in concrete stress can, increases the amount of deflection and the ductility of composite construction, make full use of the material self character, prevent the generation of major fracture, the crack is finer and closely woven, embodies more superior strain hardening characteristic; Also can suitably increase interface peel length by unsticking, the crack that repair layer is taken place evenly distributes in bigger zone, and the crack is full and uniform fine and closely woven.
Adopt the mode of pasting precast plate, can form two interfaces, under outer load and the shrinkage stress effect, two interfaces all can produce the crack, interface, and the crack on repair layer surface is through twice dispersion, and the more consumes of energy are in the fracture propagation of interface under the equal loading condition, postponing the crack embeds in many seam cracking cement-based composites, induce the crack of patching material to disperse, improve its discrete flaw ability, the precast plate external crack is more evenly fine and closely woven.
The present invention has provided the scope of the many seams cracking cement-based composite fiber volume fraction that is adopted, meticulous aggregate size and each weight ratio of constituents.The proportionings that can produce many fine and closely woven cracks under the tensile load effect, have a cement-base composite material of many seam cracking strain hardening characteristics are not limited thereto scope, and they also are applicable to method for repairing and mending of the present invention.
During construction, the crack periphery concrete is polished into smooth surface, milling, plucking or cutter hair are carried out in other zones of concrete surface to be handled, adopt gases at high pressure or brush cleaning old concrete surface then, rewater clean after, grouting treatment is carried out in the old concrete crack, and grouting agent can adopt common grouting agents such as cement or epoxy-cement mortar; When employing is provided with the separation layer mode at crack periphery, still adopt above-mentioned steps, just need not earlier crack periphery be polished smooth, treat after cleaning, being in the milk that the repairing face of distress in concrete periphery and grouting agent are slightly dried, separation layer is set at crack periphery.Also can earlier crack periphery be polished smooth, separation layer is set again.
Before building many seam cracking cement-based composites, concrete repair process routinely, water soaks the old concrete surface once more, and water is soaked into naturally, and bonding surface does not stay the water mark, only keeps moistening a little state; After building many seam cracking cement-based composites and floating processing, water seasoning is to the length of time routinely, and cast layer thickness is generally greater than 5mm.When covering the mode of precast plate behind the employing elder generation cast skim slurry, can place identical at concrete surface earlier with paste thickness, be used for supporting the fritter backing plate of precast plate, build many seam cracking cement-based composite slurries again, then that precast plate and cast slurry is bonding one side is coated the same slurry of skim in advance, the slurry gross thickness is a little more than plate thickness, generally greater than 3mm, precast plate is pasted on the concrete repairing face again, the pressurization, when slurry hard slightly, in the time of can not subsiding, extract backing plate (also can extract out) out, overflow slurry with the trowel cleaning, the sealing the margin space, water seasoning is to the length of time.
When concrete components such as repairing airport runways, rigid pavement, because they are less demanding to the adhesion strength at interface between repair layer and the concrete, so can only polish smooth or be provided with separation layer during construction to crack periphery, need not do milling, plucking or cutter hair to whole concrete surface handles, adopt former concrete natural surface, reduce the whole interface adhesion strength, can better bring into play the characteristic of patching material, and improve speed of application.
The present invention can solve that stress in the crack arrest technique of existing crack is concentrated and the problem that causes the repair layer cracking, can prevent to form the penetrability crack, give full play to the strain hardening characteristic energy of many seam cracking cement-based composites, improve its discrete flaw ability, reach better crack arrest effect.Under the effect of external environment shrinkage stress, the repair layer crack width generally can much smaller than the limit value of all kinds of standards to crack width, can stop the invasion and attack of hazardous substances less than 0.05mm, can reach the requirement of harmless crack, improves structural life-time.The present invention can be widely used in the crack of concrete structures such as rigid pavement, aircraft airfield runway, dam crack band and pontic surface plate and repair.Use precast plate can also avoid construction to wipe one's face, be convenient to implement mechanized continuous productive process or semiautomatic working, accelerate speed of application.
Description of drawings
Fig. 1 polishes smooth or is provided with the separation layer floor map for concrete external surface crack periphery.
1 is concrete structure among the figure, and 2 is distress in concrete, and 3 polish smooth or be provided with the separation layer zone for crack periphery.
Fig. 2 polishes smooth or is provided with separation layer for concrete external surface crack periphery, cast-in-site stitches cracking cement-based composite mending concrete crack more, and repair layer fractue spacing schematic diagram.
4 is cast-in-place many seam cracking cement-based composites among the figure, 5 are subjected to the equally distributed minute crack that produces behind the extraneous load for repair layer, A1, A2 are the final position of interface peel between old concrete and the cast-in-place repair layer, about horizontal and oblique upward arrow represent interface fracture propagation direction and repair layer fracture propagation direction respectively.
Fig. 3 is for concrete external surface crack periphery polishes smooth or be provided with separation layer, earlier the cast skim is stitched the cracking cement-based composite slurry more, covered precast plate mode mending concrete crack and repair layer fractue spacing schematic diagram again.
4 stitch the cracking cement-based composite slurry for cast-in-place skim more among the figure, 5 are subjected to the equally distributed minute crack that produces behind the extraneous load for cast-in-place (glue) layer, 6 is many seam cracking cement-based composite precast plates, 7 are subjected to the equally distributed minute crack that produces behind the extraneous load for precast plate, A1, A2, B1, B2 are the final position of interface peel, about horizontal and oblique upward arrow represent interface fracture propagation direction and repair layer fracture propagation direction respectively.
Fig. 4-A is the load test photo as a result after concrete external surface crack periphery is provided with separation layer, cast-in-place many seam cracking cement-based composites and repairs, and 8 for measuring the instrument LVDT of repair layer distortion among the figure.
Fig. 4-B does not stitch cracking cement-based composite more and repairs back load test photo as a result for the periphery of the identical distress in concrete of Fig. 4-A separation layer, cast-in-place identical proportioning being set, and 9 is the penetrability major fracture among the figure.
Fig. 4-C is for being provided with load test photo as a result after separation layer, cast-in-place mortar material are repaired with the periphery of the identical distress in concrete of Fig. 4-A, and 10 be the mortar material repair layer among the figure, and 11 is the crack that produces after the mortar repair layer load test
Fig. 5-A is that concrete external surface crack periphery is provided with separation layer, earlier the cast skim is stitched the cracking cement-based composite slurry more, covered load test photo as a result after precast plate is repaired again.
Fig. 5-B stitches load test photo as a result after cracking cement-based composite is repaired for the periphery of the identical distress in concrete of Fig. 5-A separation layer, cast-in-place identical proportioning being set more.
Fig. 5-C for load test after the periphery of the identical distress in concrete of Fig. 5-A is provided with separation layer, cast-in-place steel fibre materials repairing photo as a result, 12 be steel fibrous concrete among the figure, 13 is the crack that produces after the steel fibrous concrete repair layer load test.
The specific embodiment
The invention will be further described below in conjunction with embodiment.
The many seams of embodiment 1 usefulness cracking cement-based composite adopts the crack that separation layer, cast-in-place mode mending concrete crack are set on every side.
Many each weight ratio of constituentss of seam cracking cement-based composite are cement: water: sand: flyash: silicon ash: water reducing agent=1: 1.58: 1.5: 2.0: 0.15: 0.02, also contain the vinal that volume is a total composite volume 2%, the sand maximum particle diameter is 0.2mm; The cement type is PII42.5R, and flyash is I level flyash, and water reducing agent is polycarboxylic acid salt's water reducing agent.
Referring to Fig. 1, Fig. 2, concrete structure adopts the prism of two separation, is the precast concrete crack between two block concretes, and fracture length is 50mm.Remove the concrete surface floating dust, clean surface, treat that the surface is slightly done after, adhesive waterproof tapes (separation layer is set) are pasted in each outside 25mm zone 3 of distress in concrete 2 peripheries.
Water soaks concrete surface once more, and water is soaked into naturally, and bonding surface does not stay the water mark, only keeps moistening a little state; After will stitching cracking cement-based composite more and stirring by said ratio, be poured into and be little moistening state concrete surface, form repair layer 4, repair layer thickness is 50mm, and water seasoning is to the length of time.
Repair layer and concrete composite construction are adopted the four-point bending load test, investigate the effect in this method mending concrete crack, load mode is displacement control.The result shows that repair layer crack 5 is distributed in interface peel scope A 1~A 2In, fractue spacing is evenly fine and closely woven, and when the peak value load, maximum crack width is less than 0.08mm.The result of the test photo is seen Fig. 4-A.
The contrast experiment:
1) with many seams cracking cement-based composite of same proportioning, under the situation that separation layer is not set, repairs identical concrete structure crack.Repair layer/composite concrete structure four-point bending load test the results are shown in Figure 4-B, and repair layer forms major fracture 9.
2) under the situation that the same separation layer is set, with the identical concrete structure crack of ordinary mortar materials repairing.Repair layer/composite concrete structure four-point bending load test the results are shown in Figure 4-C, and mortar repair layer 10 forms major fracture 11.
The crack dispersion effect of Fig. 4-A illustrates because the layout of separation layer makes between concrete substrate and the repair layer and forms interfacial separation significantly better than Fig. 4-B, repair layer fractue spacing scope increases, therefore the crack dispersion effect is better, forms a large amount of fine and closely woven cracks, has avoided the formation of major fracture.And the test specimen that mortar material is repaired, shown in Fig. 4-C, though be provided with separation layer, still only there is a major fracture in test specimen after destroying, this is to be determined by the anti-crack ability of mortar self and single crack destruction characteristic, and repair layer is in case cracking just directly forms major fracture.
Covering precast plate mode mended a split after embodiment 2 was provided with separation layer around adopting the crack, the cast skim is stitched the cracking cement-based composite slurry more earlier.
The weight ratio of many each compositions of seam cracking cement-based composite is a cement: water: sand: flyash: silicon ash: water reducing agent=1: 1.23: 1.2: 1.8: 0.12: 0.01, also contain the vinal that volume is a total composite volume 2%, the cement type is PII42.5R, the sand maximum particle diameter is 0.2mm, flyash is I level flyash, and water reducing agent is polycarboxylic acid salt's water reducing agent.
Referring to Fig. 1, Fig. 3, concrete structure adopts the prism of two separation, is the precast concrete crack between two block concretes, and fracture length is 100mm.Remove the concrete surface floating dust, clean surface, treat that the surface is slightly done after, adhesive waterproof tapes (separation layer is set) are pasted in each outside 25mm zone 3 of distress in concrete 2 peripheries.
Water soaks concrete surface once more, and water is soaked into naturally, and bonding surface does not stay the water mark, only keeps moistening a little state; On concrete substrate, place backing plate, to guarantee the bondline thickness between precast plate and the concrete.
Prepare many seam cracking cement-based composites according to proportioning, use the Mold Making precast plate, thickness is 26mm, treats disposed slurry initial set in 24~48 hours, the demoulding, and maintenance is 28 days under the standard conditions.
Lay one deck at concrete surface and stitch cracking cement-based composite slurry 4 more, the side that precast plate 6 is prepared and slurry is bonding also applies one deck 1~2mm slurry, the slurry gross thickness is a little more than plate thickness, then precast plate is pasted on the concrete, weight pressurization, when slurry hard slightly, in the time of can not subsiding, extract backing plate out, overflow slurry, sealing the margin space with the trowel cleaning.After 48 hours, be placed into fog room standard conditions maintenance 28 days.
Repair layer and concrete composite construction are adopted the four-point bending load test, investigate the effect in this method mending concrete crack, load mode is displacement control.The result shows that cast-in-place glue-line crack 5 is distributed in the dissection scope A of cast-in-place glue-line and concrete interface 1~A 2In, precast plate crack 7 is distributed in the dissection scope B at precast plate and cast-in-place glue-line interface 1~B 2In, crack 7 is more evenly fine and closely woven, and when the peak value load, maximum crack width is less than 0.04mm.The result of the test photo is seen Fig. 5-A.
The contrast experiment:
1) separation layer is set,, adopts cast-in-place mode to repair identical concrete structure crack with many seams cracking cement-based composite of same proportioning.Repair layer/composite concrete structure four-point bending load test the results are shown in Figure 5-B.
2) separation layer is set, use steel fibrous concrete, cast-in-place mode is repaired identical concrete structure crack, the steel fibrous concrete component content is a cement: water: sand: stone=1: 0.48: 1.76: 2.64 (weight ratios), the volume of steel fibre is 1% of a material cumulative volume, adopt 42.5R PII Portland cement, the sand maximum particle diameter is 1mm, and the maximum particle diameter of stone is 10mm.Repair layer/composite concrete structure four-point bending load test the results are shown in Figure 5-C, and steel fibrous concrete repair layer 12 forms major fracture 13.
When the peak value load, record the maximum major fracture width of three kinds of modes and be respectively 0.036mm, 0.078mm, 2.62mm it is 47 that the crack number is respectively, 10, article 2,, shown in figure (photo) 5-A, 5-B, 5-C, take pictures after being retouched and deceiving in the precast plate crack 7 among the 5-A.
Covering the precast plate mode repairs, can produce cast-in-place glue-line/concrete, precast plate/two interfaces of cast-in-place glue-line, when load increases, interface cracking between cast-in-place glue-line and the concrete, the crack, interface alternately takes place with the cast-in-place glue-line of embedding crack, the crack enters into precast plate/cast-in-place glue-line interface subsequently, the crack, interface further expands, the more consumes of energy are in the fracture propagation of interface under the equal loading condition, further postpone the crack and embed in the patching material, it is more evenly fine and closely woven that the precast plate external crack is compared cast-in-place repairing method.
Because the anti-crack ability of steel fibre repair layer and ultimate tensile strength are much smaller than many seams cracking cement-based composite, therefore pour into a mould before the steel fibrous concrete repair layer, though be provided with separation layer around the distress in concrete, but still there is the crack of broad in repair layer, and repair layer is in case cracking just directly forms major fracture.
Embodiment 3, and with many seam cracking cement-based composites, employing polishes smooth around the crack, cast-in-place mode is repaired hydraulic structure dam body surface distress in concrete.
Many each weight ratio of constituentss of seam cracking cement-based composite are cement: water: sand: flyash: granulated blast-furnace slag: metakaolin: water reducing agent: defoamer: thickener=1: 2.2: 1.4: 6.9: 0.55: 0.12: 0.008: 0.01: 0.005; also containing volume is the aromatic polyamide fibre of total composite volume 1.0% and the assorted fibre of carbon fiber (both weight ratios are 2: 1); the cement type is PII32.5R; the sand maximum particle diameter is 0.45mm; flyash is II level flyash, and water reducing agent is polycarboxylic acid salt's water reducing agent.
Construction sequence is as follows:
1) will externally extend about 35mm zone from concrete external surface crack periphery all directions and polish smooth, other zones of concrete external surface are carried out milling, plucking or cutter hair and are handled;
2) adopt gases at high pressure or brush cleaning surface, the cleaning of watering then;
3) to the dam body crack clear up, grouting treatment, grouting agent can adopt common grouting agents such as cement or epoxy-cement mortar;
4) treat that grouting agent is slightly dried, water soaks the old concrete surface once more, and water is soaked into naturally, and bonding surface does not stay the water mark, only keeps moistening a little state, builds many seam cracking cement-based composites immediately, builds thickness 60mm, the processing of wiping one's face;
5) water seasoning is to the length of time.
Embodiment 4, adopt separation layer is set, and the cast skim covers the precast plate mode after stitching the cracking cement-based composite slurry more earlier, temperature influence is produced the reparation construction of the bridge deck in extensive shrinkage crack.
Many each weight ratio of constituentss of seam cracking cement-based composite are cement: water: sand: flyash: silicon ash: metakaolin: water reducing agent: air entraining agent: methylcellulose=1: 1.8: 3.0: 4.2: 0.3: 0.4: 0.02: 0.006: 0.022, the assorted fibre (weight ratio is 1: 1: 2) that also contains Kevlar fabric that volume is a total composite volume 3.0%, polyethylene fibre, aramid fiber, the cement type is PII52.5R, the sand maximum particle diameter is 0.6mm, flyash is I level flyash, and water reducing agent is polycarboxylic acid salt's water reducing agent.
Construction sequence is as follows:
1) will externally extend about 80mm zone from concrete external surface crack periphery all directions and polish smooth, other zones of concrete external surface are carried out milling, plucking or cutter hair and are handled (also can adopt the concrete natural surface not process);
2) adopt gases at high pressure or brush cleaning surface, the cleaning of watering then;
3) to the bridge deck crack clear up, grouting treatment, grouting agent can adopt common grouting agents such as cement or epoxy-cement mortar;
4) after the repairing face for the treatment of grouting agent and distress in concrete periphery is slightly done, externally extend about 80mm area arrangements plastics glued membrane in the crack periphery all directions.
5) water soaks the old concrete surface once more, and water is soaked into naturally, and bonding surface does not stay the water mark, only keeps moistening a little state.
6) place the fritter backing plate on the old concrete surface, combine the thickness of extrusion process mesoglea with concrete to guarantee precast plate, plate thickness is 10mm, equals the cast-in-place bondline thickness of moulding rear interface.
7) build one deck and stitch the cracking cement-based composite slurry more, with thickness is that the precast plate that 40mm, surface scribble same slurry pastes on the concrete repairing face of building one deck slurry (cast-in-place glue-line), the surface and the cast-in-place glue-line that scribble slurry are bonding, the a little higher than plate thickness of slurry gross thickness, pressurization.
8) when slurry hard slightly, in the time of can not subsiding, extract backing plate out, overflow slurry, sealing the margin space with the trowel cleaning.Or backing plate forever is cast in the tack coat of interface, water seasoning is to the length of time.

Claims (5)

1. method with many seams cracking cement-based composite mending concrete crack, adopt many seam cracking cement-based composites to cover the concrete external surface as repair layer, many seam cracking cement-based composites reach more than 1% in the stretching strain of tensile load effect limit inferior, can produce many fine and closely woven cracks, it is characterized in that, before the many seams of cast cracking cement-based composite, concrete external surface crack periphery is polished smooth or is provided with separation layer, to weaken or to eliminate adhesion strength between crack periphery concrete and the many seam cracking cement-based composites; Cover the mode of precast plate after adopting the cast slurry or pouring into a mould the skim slurry earlier, will stitch cracking cement-based composite more and cover the concrete external surface; The weight ratio of each composition that the many seams cracking cement-based composite that is adopted comprises is:
Cement: water: meticulous aggregate: flyash: silicon ash: granulated blast-furnace slag: metakaolin=1: (0.27~2.2): (0~3): (0~6.9): (0~0.3): (0~0.55): (0~0.4) also contains the fiber that volume is a total composite volume 1%~3%, and the particle diameter of meticulous aggregate is less than or equal to 0.6mm.
2. the method in many seam cracking cement-based composite mending concretes as claimed in claim 1 crack is characterized in that the scope that concrete external surface crack periphery polished smooth or be provided with separation layer is: externally extend 5~80mm from the crack periphery all directions.
3. the method in many seam cracking cement-based composite mending concretes as claimed in claim 1 or 2 crack, it is characterized in that, when adopting the mode of pouring into a mould skim slurry, back covering precast plate earlier, before covering precast plate, the one side that precast plate and cast slurry is bonding is coated the same slurry of skim in advance.
4. the method in many seam cracking cement-based composite mending concretes as claimed in claim 3 crack is characterized in that the scope that concrete external surface crack periphery polished smooth or be provided with separation layer is: externally extend 5~50mm from the crack periphery all directions.
5. the method in many seam cracking cement-based composite mending concretes as claimed in claim 3 crack is characterized in that the bonding surface of precast plate and slurry is corrugated surface or other male and fomale(M﹠F)s.
CN 201010109639 2010-02-12 2010-02-12 Method for repairing concrete crack with multi-cracking cement-based composite Pending CN101787672A (en)

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CN102226330A (en) * 2011-05-20 2011-10-26 重庆诚邦科技发展有限公司 Method for micro-treatment of cement concrete road surface
CN102251464A (en) * 2011-04-21 2011-11-23 高伟 Asphalt pavement crack pouring process and pavement crack repair agent
CN102392441A (en) * 2011-07-26 2012-03-28 杭州固华复合材料科技有限公司 Composite crack control prestressed concrete big tube pile and manufacturing method thereof
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CN103964767A (en) * 2014-03-04 2014-08-06 杭州固华复合材料科技有限公司 Cement-based composite and mending method of concrete cracks
CN104129951A (en) * 2014-08-06 2014-11-05 杭州固益强新材料科技有限公司 Self-cleaned cement based composite material with high toughness and preparation method of self-cleaned cement based composite material
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CN102251464B (en) * 2011-04-21 2013-02-27 高伟 Asphalt pavement crack pouring process and pavement crack repair agent
CN102226330A (en) * 2011-05-20 2011-10-26 重庆诚邦科技发展有限公司 Method for micro-treatment of cement concrete road surface
CN102392441A (en) * 2011-07-26 2012-03-28 杭州固华复合材料科技有限公司 Composite crack control prestressed concrete big tube pile and manufacturing method thereof
CN103114517A (en) * 2013-02-07 2013-05-22 东南大学 Handheld dual-component encapsulation material injector
CN103114517B (en) * 2013-02-07 2015-04-15 东南大学 Handheld dual-component encapsulation material injector
CN103964767A (en) * 2014-03-04 2014-08-06 杭州固华复合材料科技有限公司 Cement-based composite and mending method of concrete cracks
CN103964767B (en) * 2014-03-04 2015-07-22 杭州固华新材料科技有限公司 Cement-based composite and mending method of concrete cracks
CN104129951A (en) * 2014-08-06 2014-11-05 杭州固益强新材料科技有限公司 Self-cleaned cement based composite material with high toughness and preparation method of self-cleaned cement based composite material
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CN107044188A (en) * 2017-01-19 2017-08-15 北京工业大学 A kind of Light trabses of crack resistence automatically cleaning from card-type
CN107402152A (en) * 2017-08-02 2017-11-28 深圳大学 For the method in pre-cast concrete base test specimen crack, prefabricated test specimen and prefabrication system
CN107604801A (en) * 2017-10-13 2018-01-19 苏州东振路桥工程有限公司 The reparation structure and its gap casting glue restorative procedure of a kind of impaired bituminous paving
CN107604801B (en) * 2017-10-13 2019-09-06 苏州东振路桥工程有限公司 A kind of the reparation structure and its gap casting glue restorative procedure of impaired bituminous pavement
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