CN116283058A - Concrete pavement repair material and application thereof - Google Patents
Concrete pavement repair material and application thereof Download PDFInfo
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- CN116283058A CN116283058A CN202310400507.5A CN202310400507A CN116283058A CN 116283058 A CN116283058 A CN 116283058A CN 202310400507 A CN202310400507 A CN 202310400507A CN 116283058 A CN116283058 A CN 116283058A
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/14—Polyepoxides
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
- E01C7/147—Repairing concrete pavings, e.g. joining cracked road sections by dowels, applying a new concrete covering
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a concrete pavement repair material and application thereof, and belongs to the technical field of pavement repair. The repairing material comprises the following raw materials in percentage by volume: 25-35 parts of first lightweight aggregate, 5-15 parts of second lightweight aggregate and 55-65 parts of epoxy adhesive, wherein the first lightweight aggregate has an average particle size of 5-10 mm and an apparent density of 0.5-0.7 g/cm 3 The second light aggregate is the hydrophobic modified ceramsite with the average grain diameter of 10-20 mm and the apparent density of 0.5-0.7 g/cm 3 Is prepared from the hydrophobic modified ceramsite. The invention utilizes light weightThe apparent density of the aggregate is lower than the characteristic of the epoxy adhesive, the self-generating motion generated by buoyancy force increases the stacking density of the surface aggregate, the proportion of the adhesive at the bottom is increased, the effects of increasing the surface strength and hardness and filling the pit with firm bottom adhesion are achieved, meanwhile, the effective filling of cracks at the bottom of the pit is realized, the repairing function of repairing the pit and the pavement with fine crack filling reinforcement is achieved, and the repairing service life is remarkably prolonged.
Description
Technical Field
The invention relates to the technical field of pavement repair, in particular to a concrete pavement repair material and application thereof.
Background
In recent decades, cement concrete has been put into mass production in infrastructure construction such as roads. However, the damage phenomenon is visible everywhere and is increasingly serious after the concrete pavement is used for a period of time due to the problems of design strength, construction quality, maintenance and the like.
Among the cement concrete pavement diseases, cracks and damages are most common, serious and complex, and the cracks and damages are basically obvious in causality. This is because the inherent characteristics of cement concrete materials, as well as internal and apparent cracks are inevitably generated during pavement construction, are affected by various factors. After the crack is generated, under the reciprocating action of the vehicle load and the influence of environmental factors, the concrete is expanded and penetrated along with time, stress concentration occurs at the crack, so that the concrete is crushed along the crack, broken at the crack, sliding of the concrete slab occurs and the like, the integrity of the concrete pavement is damaged, and the pavement is damaged in a large area.
The existing pavement repair material system mainly comprises cement mortar and polymer mortar repair materials. The two repair material systems are mainly prepared by mixing cement or polymer serving as a cementing material and sand or stone serving as an aggregate. Two main problems exist in the use of these two types of pavement repair materials: (1) The system has relatively high viscosity and good filling and reinforcing effects on large-area damage, but is difficult for micro cracks, especially cracks with a certain depth, to penetrate into the micro cracks, so that the damaged position cannot be reinforced more effectively; (2) The density of the aggregate in the repairing material system is often far higher than that of water or polymer emulsion, so that the aggregate sinks under the action of gravity when the repairing material is filled into a repairing part, the lower aggregate of the repairing material affects the adhesion with a substrate more, the upper aggregate affects the pavement strength less, and the problems are more likely to occur particularly when the repairing thickness is larger.
It is apparent that the conventional concrete pavement repairing material has inconvenience and defects when in use, and further improvement is needed. The novel concrete pavement repair material and the application thereof can be created, so that the characteristic that the apparent density of the lightweight aggregate is far lower than that of the resin material is utilized, the surface aggregate stacking density is increased in a self-motion mode generated by buoyancy during use, the proportion of the epoxy adhesive at the bottom is increased, the filling effects of increasing the surface strength and the hardness and firmly reinforcing the bonding of the bottom are achieved, meanwhile, the low-viscosity epoxy adhesive with long operation time can effectively infiltrate into micro cracks, and the pavement repair material has the functions of repairing pits and reinforcing the micro cracks, so that the pavement repair material becomes an urgent need for improvement in the current industry.
Disclosure of Invention
The invention aims to solve the technical problem of providing a concrete pavement repair material, which utilizes the characteristic that the apparent density of lightweight aggregate is far lower than that of a resin material, and increases the stacking density of the surface aggregate and the proportion of a bottom epoxy adhesive in use due to a spontaneous movement mode generated by buoyancy, so that the filling effects of increasing the surface strength and the hardness and firmly reinforcing the bottom adhesion are achieved, and meanwhile, the low-viscosity epoxy adhesive with long operation time can effectively infiltrate into micro cracks and has the functions of repairing pits and filling and reinforcing the micro cracks, thereby overcoming the defects of the conventional concrete pavement repair material.
In order to solve the technical problems, the invention provides a coagulationThe soil pavement repair material comprises the following raw materials in percentage by volume: 25-35 parts of first lightweight aggregate, 5-15 parts of second lightweight aggregate and 55-65 parts of epoxy adhesive, wherein the first lightweight aggregate adopts an average particle size of 5-10 mm and an apparent density of 0.5-0.7 g/cm 3 The second lightweight aggregate adopts the ceramsite with the average grain diameter of 10-20 mm and the apparent density of 0.5-0.7 g/cm 3 Is a ceramic grain.
Further improvement comprises the following raw materials in percentage by volume: 30 parts of first lightweight aggregate, 15 parts of second lightweight aggregate and 55 parts of epoxy adhesive.
Further improved, the first lightweight aggregate adopts the materials with the average grain diameter of 5-10 mm and the apparent density of 0.5-0.7 g/cm 3 The hydrophobic modifier of the hydrophobic modified ceramsite is methyltrichlorosilane.
Further improves, the second lightweight aggregate adopts the materials with the average grain diameter of 10-20 mm and the apparent density of 0.5-0.7 g/cm 3 The hydrophobic modifier of the hydrophobic modified ceramsite is methyltrichlorosilane.
Further improved, the preparation method of the first and second lightweight aggregates comprises the following steps: adding 20% of ceramsite into 75% of 95% ethanol solution, adding 5% of methyltrichlorosilane, uniformly mixing, sealing, standing at room temperature for 24 hours, taking out ceramsite, and drying in a 60 ℃ oven for 12 hours to obtain hydrophobic modified ceramsite I and hydrophobic modified ceramsite II.
Further improved, the epoxy adhesive is SIKADUR-52CN or SHO BOND BL-GROUP.
Further improved, the mass ratio of the resin to the curing agent is 2:1 when the SIKADUR-52CN epoxy adhesive is used, the mass ratio of the resin to the curing agent is 7:3 when the SHO BOND BL-GROUP epoxy adhesive is used, and the apparent density of the mixture after the resin and the curing agent are uniformly mixed is 1.1-1.2 g/cm 3 The viscosity is less than or equal to 300 mPas, and the maintenance time of the viscosity at room temperature is less than or equal to 300 mPas is more than or equal to 20min.
As a further improvement of the present invention, the present invention also provides an application improvement of the above-mentioned concrete pavement repair material in repairing concrete pits, the application method of the concrete pavement repair material is as follows: uniformly mixing the resin component and the curing agent component in the epoxy adhesive, adding the first lightweight aggregate and the second lightweight aggregate according to the volume ratio of raw materials, uniformly mixing in 1min, filling the uniformly mixed repairing material into a concrete pit to be repaired in 2min, scraping the surface by a shovel blade, and curing at room temperature for 12-24 h to finish the repairing of the concrete pavement.
Further improved, the depth range of the concrete pit is 5-10 cm.
With such a design, the invention has at least the following advantages:
according to the concrete pavement repair material, the lightweight aggregates with different particle sizes are added into the epoxy adhesive, and the apparent density of the lightweight aggregates is far lower than that of the resin material, so that the bulk density of the surface aggregates is increased in a self-movement mode generated by buoyancy in use, the proportion of the epoxy adhesive at the bottom is increased, and the filling effects of increasing the surface strength and the hardness and firmly reinforcing the bottom adhesion are achieved. Meanwhile, the low-viscosity epoxy adhesive with long operation time can effectively permeate into the micro cracks, and has the functions of repairing pits and repairing the pavement reinforced by filling the micro cracks.
The ceramic particle lightweight aggregate after hydrophobic modification is adopted, so that the surface strength and hardness of the repairing material and the bonding firmness of the bottom can be effectively enhanced, and a better repairing function is achieved in a pit with the repairing depth of 5-10 cm, so that the compressive strength and the interface drawing strength of the repairing material after repairing are obviously improved.
The epoxy adhesive with low viscosity can be maintained for a long time, so that the resin material in the repairing material can easily permeate along the crack at the lower part of the pit slot, and the lower concrete matrix is effectively reinforced, thereby remarkably prolonging the service life of the repaired part.
Drawings
The foregoing is merely an overview of the present invention, and the present invention is further described in detail below with reference to the accompanying drawings and detailed description.
FIG. 1 is a schematic cross-sectional view of a concrete block to be repaired used in the present invention, wherein H represents the size of the concrete block to be repaired, H represents the pit depth, and d represents the artificial crack spacing.
FIG. 2 is a schematic sectional view showing the repairing effect of a concrete sample to be repaired by using the concrete pavement repairing material of the present invention, wherein both the pit and the lower crack are filled and repaired by the pavement repairing material.
Detailed Description
Example 1
Preparation and application of concrete pavement repair material
(1) Preparation of hydrophobically modified lightweight aggregate I
Average grain diameter of 5-10 mm and apparent density of 0.7g/cm 3 Adding the ceramsite 25L into 93.75L ethanol solution (95% purity industrial grade), adding 6.25L methyltrichlorosilane into the mixture, uniformly mixing, sealing and standing for 24 hours, taking out the ceramsite, and drying the ceramsite in a 60 ℃ oven for 12 hours to obtain hydrophobic modified ceramsite I, namely hydrophobic modified lightweight aggregate I;
(2) Preparation of hydrophobically modified lightweight aggregate II
Average grain diameter of 10-20 mm and apparent density of 0.7g/cm 3 Adding the ceramic particles 10L into 37.5L of ethanol solution (95% purity industrial grade), adding 2.5L of methyltrichlorosilane into the mixture, uniformly mixing, sealing and standing for 24h, taking out the ceramic particles, and drying the ceramic particles in a 60 ℃ oven for 12h to obtain hydrophobic modified ceramic particles II, namely hydrophobic modified lightweight aggregate II;
(3) Taking a commercially available SIKADUR-52CN bi-component epoxy adhesive, uniformly mixing epoxy resin and a curing agent according to a product specification according to a mass ratio of 2:1, wherein the viscosity after mixing is less than 250 mPa.s, and the maintenance time of the viscosity at room temperature is less than or equal to 300 mPa.s is more than or equal to 25min;
(4) Adding 25L of first hydrophobically modified lightweight aggregate and 10L of second hydrophobically modified lightweight aggregate into 65L of the prepared epoxy adhesive system, and mechanically stirring uniformly within 1 min;
(5) Filling the mixture into a pit shown in the attached figure 1, finishing filling within 2min, scraping by a shovel blade, and solidifying for 24h at room temperature.
Wherein h=20cm, h=5cm, d=1cm, and the artificial crack width is 0.5mm.
Example 2
Preparation and application of concrete pavement repair material
(1) Preparation of hydrophobically modified lightweight aggregate I
Taking the materials with the average grain diameter of 5-10 mm and the apparent density of 0.5g/cm 3 Adding the 30L of ceramsite into 112.5L of ethanol solution (95% purity industrial grade), adding 7.5L of methyltrichlorosilane into the mixture, uniformly mixing, sealing and standing for 24 hours, taking out the ceramsite, and drying the ceramsite in a 60 ℃ oven for 12 hours to obtain hydrophobic modified ceramsite I, namely hydrophobic modified lightweight aggregate I;
(2) Preparation of hydrophobically modified lightweight aggregate II
Average grain diameter of 10-20 mm and apparent density of 0.7g/cm 3 Adding the 15L ceramsite into 56.25L ethanol solution (95% purity industrial grade), adding 3.75L methyltrichlorosilane into the mixture, uniformly mixing, sealing and standing for 24 hours, taking out the ceramsite, and drying the ceramsite in a 60 ℃ oven for 12 hours to obtain hydrophobic modified ceramsite II, namely hydrophobic modified lightweight aggregate II;
(3) Taking a commercially available SIKADUR-52CN bi-component epoxy adhesive, uniformly mixing epoxy resin and a curing agent according to a product specification according to a mass ratio of 2:1, wherein the viscosity after mixing is less than 250 mPa.s, and the maintenance time of the viscosity at room temperature is less than or equal to 300 mPa.s is more than or equal to 25min;
(4) Adding 30L of first hydrophobically modified lightweight aggregate and 15L of second hydrophobically modified lightweight aggregate into 55L of the prepared epoxy adhesive system, and mechanically stirring uniformly within 1 min;
(5) Filling the mixture into a pit shown in the attached figure 1, finishing in 2min, scraping by a shovel blade, and solidifying for 24h at room temperature.
Where h=20 cm, h=10 cm, d=1 cm, and the artificial crack width is 0.5mm.
Example 3
Preparation and application of concrete pavement repair material
(1) Preparation of hydrophobically modified lightweight aggregate I
Taking the materials with the average grain diameter of 5-10 mm and the apparent density of 0.5g/cm 3 Is added into 131.25L of ethanol solution (95% purity)Industrial grade), 8.75L of methyltrichlorosilane is added into the mixture, the mixture is uniformly mixed and then is sealed for 24 hours, the ceramsite is taken out, and the mixture is dried in a baking oven at 60 ℃ for 12 hours, so that a first hydrophobically modified ceramsite, namely a first hydrophobically modified lightweight aggregate, is obtained;
(2) Preparation of hydrophobically modified lightweight aggregate II
Taking the materials with the average grain diameter of 10-20 mm and the apparent density of 0.5g/cm 3 Adding the ceramsite 5L into 18.75L of ethanol solution (95% purity industrial grade), adding 1.25L of methyltrichlorosilane into the mixture, uniformly mixing, sealing and standing for 24 hours, taking out the ceramsite, and drying the ceramsite in a 60 ℃ oven for 12 hours to obtain hydrophobic modified ceramsite II, namely hydrophobic modified lightweight aggregate II;
(3) Taking a commercially available SHO BOND BL-GROUP bi-component epoxy adhesive, uniformly mixing epoxy resin and a curing agent according to a product specification according to a mass ratio of 7:3, wherein the viscosity after mixing is less than or equal to 300 mPas, and the maintenance time of the viscosity at room temperature is less than or equal to 300 mPas is more than or equal to 20min;
(4) Adding 35L of first hydrophobically modified lightweight aggregate and 5L of second hydrophobically modified lightweight aggregate into 60L of the prepared epoxy adhesive system, and mechanically stirring uniformly within 1 min;
(5) Filling the mixture into a pit shown in the figure 1, finishing in 2min, scraping by a shovel blade, and curing for 12h at room temperature.
Where h=20 cm, h=10 cm, d=1 cm, and the artificial crack width is 0.5mm.
Example 4
Preparation and application of concrete pavement repair material
(1) Preparation of hydrophobically modified lightweight aggregate I
Average grain diameter of 5-10 mm and apparent density of 0.7g/cm 3 Adding the ceramsite 28L into 105L ethanol solution (95% purity industrial grade), adding 7L methyltrichlorosilane into the mixture, uniformly mixing, sealing and standing for 24h, taking out the ceramsite, and drying the ceramsite in a 60 ℃ oven for 12h to obtain hydrophobically modified ceramsite I, namely hydrophobically modified lightweight aggregate I;
(2) Preparation of hydrophobically modified lightweight aggregate II
Taking the materials with the average grain diameter of 10-20 mm and the apparent density of 0.5g/cm 3 Ceramsite 8L of (A) and adding it intoAdding 2L of methyltrichlorosilane into 30L of ethanol solution (95% purity industrial grade), uniformly mixing, sealing and standing for 24h, taking out ceramsite, and drying in a 60 ℃ oven for 12h to obtain hydrophobically modified ceramsite II, namely hydrophobically modified lightweight aggregate II;
(3) Taking a commercially available SHO BOND BL-GROUP bi-component epoxy adhesive, uniformly mixing epoxy resin and a curing agent according to a product specification according to a mass ratio of 7:3, wherein the viscosity after mixing is less than or equal to 300 mPas, and the maintenance time of the viscosity at room temperature is less than or equal to 300 mPas is more than or equal to 20min;
(4) Adding 28L of first hydrophobically modified lightweight aggregate and 8L of second hydrophobically modified lightweight aggregate into 64L of the prepared epoxy adhesive system, and mechanically stirring uniformly within 1 min;
(5) Filling the mixture into a pit shown in the figure 1, finishing in 2min, trowelling by a scraper, and curing for 12h at room temperature.
Where h=20 cm, h=10 cm, d=1 cm, and the artificial crack width is 0.5mm.
Comparative example 1
A commercial cement-based pavement repairing material, such as CT1 type repairing material manufactured by Jinan Li Boli building materials Co., ltd, is adopted, mixed according to the mass ratio of water to powder of 17:100, and pits shown in the figure 1 are repaired, and cured at room temperature for 28 days.
Where h=20 cm, h=10 cm, d=1 cm, and the artificial crack width is 0.5mm.
Comparative example 2
Quartz sand with the average grain diameter of 5-10 mm and gravels with the average grain diameter of 10-20 mm are taken as the first aggregate and the second aggregate, and SIKADUR-52CN epoxy adhesive is taken as the adhesive material. And mixing according to a formula system of which the volume ratio of the aggregate I to the aggregate II to the epoxy adhesive is 30:15:55 to prepare the concrete pavement repair material.
The preparation method comprises the following steps: uniformly mixing epoxy resin and a curing agent in a weight ratio of 2:1 in the SIKADUR-52CN bi-component epoxy adhesive; then adding 30L of quartz sand serving as aggregate and 15L of broken stone serving as aggregate into 55L of the epoxy adhesive system, and mechanically stirring uniformly within 1 min; filling the mixture into a pit shown in the figure 1, trowelling by a scraper within 2min, and curing for 24 hours at room temperature.
Where h=20 cm, h=10 cm, d=1 cm, and the artificial crack width is 0.5mm.
Comparative example 3
Taking the materials with the average grain diameter of 5-10 mm and the apparent density of 0.5g/cm 3 The ceramsite and the average particle diameter of the ceramic particles are 10-20 mm, and the apparent density is 0.7g/cm 3 The ceramsite is used as the first aggregate and the second aggregate, and the SIKADUR-52CN epoxy adhesive is used as the adhesive material. And mixing according to a formula system of which the volume ratio of the aggregate I to the aggregate II to the epoxy adhesive is 30:15:55 to prepare the concrete pavement repair material.
The preparation method comprises the following steps: uniformly mixing epoxy resin and a curing agent in a weight ratio of 2:1 in the SIKADUR-52CN bi-component epoxy adhesive; then adding 30L of first aggregate ceramsite and 15L of second aggregate ceramsite into 55L of the epoxy adhesive system, and mechanically stirring uniformly within 1 min; filling the mixture into a pit shown in the figure 1, trowelling by a scraper within 2min, and curing for 24 hours at room temperature.
Where h=20 cm, h=10 cm, d=1 cm, and the artificial crack width is 0.5mm.
Detection examples
The concrete blocks of the above examples 1 to 4 and comparative examples 1 to 3 were cut and taken out 1 each of the cube blocks having the length, width and height h in the pit area and the crack area, respectively, as shown in fig. 2, and the pit area was sampled, i.e., block 1, and the crack area was sampled, i.e., block 2. Then, compressive strength tests were performed on each of the sample blocks, and the interfacial tensile bond strength, i.e., the interfacial pullout strength, of the repair materials of each of the examples and comparative examples with the concrete sample block was tested at other uncut locations according to the JT/T1211.2-2019 standard, respectively. The test results are shown in Table 1 below.
Table 1 compressive strength and interfacial pullout strength test results for each of the example and comparative repair materials
As can be seen from Table 1, the unrepaired concrete sample itself had substantially no structural strength, and the compressive strength was only 4.25MPa, due to the presence of a large number of through cracks in sample 2. In examples 1 to 4, the samples 1 and 2 after being repaired by the repairing material of the present invention have excellent compressive strength, which indicates that the repairing material has both good pit repairing and crack filling reinforcing effects, and the repairing material also has excellent interfacial adhesion effect as can be seen from the result of interfacial drawing strength.
In comparative example 1, the cement-based repair material had a high bulk compressive strength, but since the system had a high viscosity and had substantially no permeability to the lower fracture, the compressive strength of the sample block 2 was not substantially improved, and the interfacial pullout strength was also low.
In comparative example 2, since the aggregate density was much higher than the adhesive density, the aggregate was sunk after repair filling, occupied the lower position, and the glue was difficult to penetrate down into the cracks, so that the compressive strength of the sample block 2 was low and the interfacial pull strength was also low.
In comparative example 3, since the ceramsite is not modified, the ceramsite which is not modified in viscosity reducing effect on the glue solution is obvious, and thus the penetration depth is inferior to the penetration of the modified ceramsite in the curing time, resulting in lower compressive strength of the sample block 2.
Moreover, according to the invention, the depth of the pit is preferably 5-10 cm as shown in the experiment of the depth of the repairing pit, if the depth of the pit is less than 5cm, the buoyancy space of the repairing material is insufficient during repairing, and the lightweight aggregate cannot float sufficiently, so that the repairing effect of the repairing material cannot be achieved; if the pit depth is more than 10cm, the adhesive and the lightweight aggregate in the repairing material are obviously layered, and the shrinkage rate and the expansion coefficient of the adhesive, the lightweight aggregate and the concrete matrix are different, so that the adhesive and the lightweight aggregate are easy to separate from the concrete interface after a long time, and the service life of the repaired concrete is influenced.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the invention in any way, and some simple modifications, equivalent variations or modifications can be made by those skilled in the art using the teachings disclosed herein, which fall within the scope of the present invention.
Claims (9)
1. The concrete pavement repair material is characterized by comprising the following raw materials in percentage by volume: 25-35 parts of first lightweight aggregate, 5-15 parts of second lightweight aggregate and 55-65 parts of epoxy adhesive, wherein the first lightweight aggregate adopts an average particle size of 5-10 mm and an apparent density of 0.5-0.7 g/cm 3 The second lightweight aggregate adopts the ceramsite with the average grain diameter of 10-20 mm and the apparent density of 0.5-0.7 g/cm 3 Is a ceramic grain.
2. The concrete pavement repair material according to claim 1, comprising the following raw materials in volume ratio: 30 parts of first lightweight aggregate, 15 parts of second lightweight aggregate and 55 parts of epoxy adhesive.
3. The concrete pavement repair material according to claim 1 or 2, wherein the lightweight aggregate has an average particle size of 5 to 10mm and an apparent density of 0.5 to 0.7g/cm 3 The hydrophobic modifier of the hydrophobic modified ceramsite is methyltrichlorosilane.
4. The concrete pavement patching material according to claim 3, wherein said second lightweight aggregate has an average particle size of 10-20 mm and an apparent density of 0.5-0.7 g/cm 3 The hydrophobic modifier of the hydrophobic modified ceramsite is methyltrichlorosilane.
5. The concrete pavement patching material of claim 4, wherein said first and second lightweight aggregates are prepared by a method comprising: adding 20% of ceramsite into 75% of 95% ethanol solution, adding 5% of methyltrichlorosilane, uniformly mixing, sealing, standing at room temperature for 24 hours, taking out ceramsite, and drying in a 60 ℃ oven for 12 hours to obtain hydrophobic modified ceramsite I and hydrophobic modified ceramsite II.
6. The concrete pavement repair material according to claim 1, wherein the epoxy adhesive is SIKADUR-52CN or SHO BOND BL-GROUP.
7. The concrete pavement repair material according to claim 6, wherein the mass ratio of resin to curing agent is 2:1 when the SIKADUR-52CN epoxy adhesive is used, the mass ratio of resin to curing agent is 7:3 when the shobond BL-GROUP epoxy adhesive is used, and the apparent density of the mixture of the resin and curing agent after being uniformly mixed is 1.1-1.2 g/cm 3 The viscosity is less than or equal to 300 mPas, and the maintenance time of the viscosity at room temperature is less than or equal to 300 mPas is more than or equal to 20min.
8. The use of the concrete pavement repair material according to any one of claims 1 to 7 in repairing concrete pits, wherein the resin component and the curing agent component in the epoxy adhesive are uniformly mixed, the first lightweight aggregate and the second lightweight aggregate are added according to the volume ratio of raw materials, the mixture is uniformly mixed within 1min, the uniformly mixed repair material is filled into the concrete pits to be repaired within 2min, the surface is scraped by a shovel blade, and the concrete pavement is cured for 12 to 24 hours at room temperature, thereby completing the repair of the concrete pavement.
9. The use of a concrete pavement repair material according to claim 8 for repairing concrete pits, wherein the depth of the concrete pits is in the range of 5-10 cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310400507.5A CN116283058A (en) | 2023-04-14 | 2023-04-14 | Concrete pavement repair material and application thereof |
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| CN202310400507.5A CN116283058A (en) | 2023-04-14 | 2023-04-14 | Concrete pavement repair material and application thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010133174A1 (en) * | 2009-05-21 | 2010-11-25 | 北京仁创科技集团有限公司 | Hydrophobic particles and manufacturing method thereof and breathable waterproof structure |
| JP2021116207A (en) * | 2020-01-28 | 2021-08-10 | 太平洋マテリアル株式会社 | Lightweight resin filler, and cured lightweight resin |
-
2023
- 2023-04-14 CN CN202310400507.5A patent/CN116283058A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010133174A1 (en) * | 2009-05-21 | 2010-11-25 | 北京仁创科技集团有限公司 | Hydrophobic particles and manufacturing method thereof and breathable waterproof structure |
| JP2021116207A (en) * | 2020-01-28 | 2021-08-10 | 太平洋マテリアル株式会社 | Lightweight resin filler, and cured lightweight resin |
Non-Patent Citations (1)
| Title |
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| 黎艳等: "含氯硅烷/聚硅氧烷改性环氧树脂", 《应用化学》, vol. 22, no. 2, pages 176 - 179 * |
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