CN113354341A - Concrete containing PVA/PAN fiber and construction method of bridge floor waterproof layer - Google Patents
Concrete containing PVA/PAN fiber and construction method of bridge floor waterproof layer Download PDFInfo
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- CN113354341A CN113354341A CN202010150363.9A CN202010150363A CN113354341A CN 113354341 A CN113354341 A CN 113354341A CN 202010150363 A CN202010150363 A CN 202010150363A CN 113354341 A CN113354341 A CN 113354341A
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/08—Damp-proof or other insulating layers; Drainage arrangements or devices ; Bridge deck surfacings
- E01D19/083—Waterproofing of bridge decks; Other insulations for bridges, e.g. thermal ; Bridge deck surfacings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant 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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/266—Concrete reinforced with fibres other than steel or glass
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/40—Plastics
Abstract
The invention discloses a concrete containing PVA/PAN fiber and a bridge floor waterproof layer construction method, and provides the concrete containing PVA/PAN fiber, which comprises the following components: 324kg of cement, 139kg of fly ash, 657-710 kg of medium sand, 1118-1129 kg of broken stone, 5.09kg of additive, 1kg of fiber and 162-98 kg of water. The PVA/PAN fiber-containing concrete and the construction method of the bridge floor waterproof layer provided by the invention can effectively overcome the influence of running load on the upper part of the bridge floor waterproof layer and the influence of creep of a beam body on the lower part of the bridge floor waterproof layer, prevent the bridge floor from failure, damage and cracking, further improve the quality of the bridge floor waterproof layer, reduce the diseases such as concrete cracks and the like, and have great significance for improving the integral durability of a bridge.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a concrete containing PVA/PAN fiber and a construction method of a bridge floor waterproof layer.
Background
The service life of the railway reinforced concrete beam is very easy to be shortened due to rainwater infiltration, and the railway concrete bridge deck waterproof layer construction is the most effective measure for improving the durability of the reinforced concrete bridge.
The concrete bridge floor waterproof layer consists of a base layer treating agent coating, a high polymer modified asphalt coiled material and a fiber concrete protective layer, wherein the upper part of the bridge floor waterproof layer is influenced by running load, and the lower part of the bridge floor waterproof layer is influenced by creep of a beam body, so that the bridge floor waterproof layer is easy to lose efficacy, damage and crack, the quality of the bridge floor waterproof layer is improved, diseases such as concrete cracks are reduced, and the concrete bridge floor waterproof layer has great significance for improving the integral durability of a bridge.
Disclosure of Invention
The invention aims to provide concrete containing PVA/PAN fibers and a bridge floor waterproof layer construction method, and aims to solve the technical problems that the bridge floor waterproof layer is easy to lose efficacy, damage and crack and the quality of the bridge floor waterproof layer is low. In order to achieve the above object, one aspect of the present invention provides a PVA/PAN fiber-containing concrete comprising the following components: 324kg of cement, 139kg of fly ash, 657-710 kg of medium sand, 1118-1129 kg of broken stone, 5.09kg of additive, 1kg of fiber and 162-98 kg of water.
Furthermore, the grain size of the medium sand is 5-10 mm.
Further, the fiber parameter was 15%.
In another aspect of the present invention there is provided a method of constructing a deck waterproofing layer using the above concrete containing PVA/PAN fibres,
step one, measurement lofting: a measuring person discharges the top elevation of the concrete protection layer on the ballast wall, and pops out an ink line on the top of the ballast wall according to the elevation data, so as to adjust the height of a walking rail of the leveling machine and control the integral elevation and the flatness of the bridge deck;
step two, base layer treatment;
thirdly, paving and pasting a waterproof coiled material for construction;
step four, constructing a concrete protective layer: after the waterproof layer is completely dried and is qualified by the inspection of a supervision engineer, a C40 fiber concrete protective layer can be constructed after the through ground wire is laid;
fifthly, brushing polyurethane waterproof paint and sealing edges;
and step six, detecting control indexes in site construction.
Further, step two, the base layer processing specifically includes:
firstly, checking and accepting a base layer surface before the waterproof layer is constructed;
secondly, processing by using a chiseling method, and leveling by using cement mortar after chiseling;
and thirdly, removing a loose layer of the bridge floor base, and filling the loose layer with cement mortar to be smooth.
Further, the fifth step specifically comprises:
firstly, cleaning the base layer again before painting the waterproof layer;
secondly, preparing and stirring materials;
thirdly, coating; brushing vertical parts such as a ballast blocking wall, a vertical wall and the like by using a brush, and scraping and coating a plane part by using a plastic or rubber scraper;
fourthly, the prepared coating is used up within 20 min;
fifthly, frost, rain and sun exposure should be prevented within 12 hours after painting;
and sixthly, testing and detecting.
Further, in the sixth step, the construction detection control indexes comprise the thickness of the waterproof coating and the drawing bonding strength; the thickness of the waterproof coating is as follows: the thickness of the waterproof coating is calculated according to the material usage, the design requirement of the polyurethane coating is 2.4kg per square meter, and the thickness is 2 mm.
Further, the drawing adhesion strength: and after the waterproof layer protective layer reaches the design strength, drilling a core sample to detect the bonding strength of the concrete and the coiled material or the coating.
Further, the testing procedure was as follows:
firstly, drilling a core sample of A50mm by using a drilling coring device, wherein the drilling depth enters a bridge deck base course for 5 mm;
secondly, fixing a spindle with the diameter of 50mm on the surface of the protective layer of the tested core sample by using an adhesive;
thirdly, after the adhesive is cured, connecting a sleeve of the adhesion tester with the top end of the spindle by using a portable adhesion tester, uniformly pressing a hydraulic handle until the spindle is separated from the base material, and reading a test result;
fourthly, randomly drawing 1 hole or continuous 32m bridge deck for detection every 10 holes or every 320m, judging that the bonding strength of the hole beam or the 32m bridge deck waterproof layer is unqualified when the data minimum single value of the hole beam or the continuous 32m bridge deck 3 is less than 0.08MPa at each hole beam or the continuous 32m bridge deck detection 3 position, and performing hole-by-hole detection or continuous detection within the range of 320m on the batch of beams; the part after core drilling is filled with polyurethane waterproof paint.
Further, the material preparation is composed of a main agent and a curing agent, and the weighing error of each component is not more than +/-2%. Forcibly stirring for 3-5 min by using an electric stirrer until the mixture is fully and uniformly mixed; and (3) no water is added during stirring, mechanical stirring is carried out, and the rotating speed of a stirrer is 200-300 r/min.
The invention has the beneficial effects that:
the construction method of the concrete containing PVA/PAN fiber and the bridge floor waterproof layer provided by the invention can effectively overcome the influence of running load on the upper part of the bridge floor waterproof layer and the influence of creep of a beam body on the lower part of the bridge floor waterproof layer, prevent the bridge floor from failure, damage and cracking, further improve the quality of the bridge floor waterproof layer, reduce the diseases such as concrete cracks and the like, and has great significance for improving the integral durability of a bridge.
And 2, based on PVA/PAN fiber railway bridge floor waterproof layer concrete proportion and performance, the whole bridge floor construction is quicker, and the quality is ensured. The production of crackle has been reduced, later stage crackle repair cost has been saved, and the labour cost has been saved in the use of novel construction equipment, when guaranteeing the engineering quality, has accelerated the time limit for a project. Taking a bridge deck waterproof layer of a certain railway project as an example, the construction period is saved by 20d from construction organization to construction completion, and 180 manual shifts are saved; the labor cost is 260 yuan/person.day, the total cost is saved by 46800 yuan, and the economic benefit is obvious.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The primary objects and other advantages of the invention may be realized and attained by the instrumentalities particularly pointed out in the specification.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a construction flow chart of the present invention.
Detailed Description
The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and illustrating the technical solutions of the present invention, but not construed as limiting the technical solutions of the present invention.
Examples
And through detecting the tensile strength, the elastic modulus, the ultimate elongation and other properties of different PVA/PAN fibers, data parameters are provided for determining the concrete mixing ratio of the final waterproof layer.
And (3) detecting indexes such as the compressive strength, the splitting strength, the impermeability, the electric flux and the like of the concrete of the waterproof layer by adjusting the adding amount of the PVA/PAN fiber, and determining the final mixing ratio.
The construction process is optimized from the aspects of fiber addition, coiled material laying, coiled material edge sealing, waterproof concrete vibration and the like, and the construction quality is ensured.
The performance indexes of the railway bridge floor waterproof concrete are detected by selecting different PVA/PAN fibers, and the mixing proportion of the railway bridge floor waterproof concrete based on the PVA/PAN fibers is determined through tests.
Adopt portable PVA PAN fibre to mix and add device, high polymer modified asphalt waterproofing membrane overlap joint banding instrument, cable duct inner waterproof layer fiber concrete vibration frock, novel waterproofing membrane shop paste novel equipment such as equipment for bridge floor waterproof layer construction quality obtains improving, and the construction is swiftly more convenient.
Fiber screening:
step one, construction preparation, organizing detailed technology before construction, and leading a general engineer to explain related technicians and operators in detail so that all the personnel master the construction process of the bridge floor waterproof layer.
And step two, various raw materials, particularly concrete admixtures, are prepared sufficiently, technical certificates and delivery qualification certificates are attached when entering a field, and test departments need to carry out spot inspection after entering the field and can use the concrete admixtures after the field is qualified.
Step three, material detection: three fibers including PAN in Shenzhen A, PAN in Jiangsu B and PVA in Sichuan C are respectively selected for testing, and after the materials enter the field, a third party is entrusted to the project to detect the main physical and mechanical performance indexes of the materials, and the main physical and mechanical performance indexes are compared:
TABLE 1 Main physical and mechanical Properties
As can be seen from the test data in Table 1 above, the three materials all meet the technical requirements, and the tensile strength and the elastic modulus of the PVA fiber are improved obviously.
The concrete containing PVA/PAN fiber provided by the invention has the following mixture ratio: cement: 324kg, fly ash: 139kg, medium sand: 657kg, 5-10 mm crushed stone: 1118kg, additives: 5.09kg, fiber: 1kg, water: 162 kg. According to the factors such as the properties of raw materials, the process characteristics and the like, different fiber materials are selected in a laboratory and are mixed in the same mixing ratio for test, and the test research is respectively carried out on the parameter performances such as the compressive strength, the elastic modulus, the electric flux, the impermeability and the like of the mixed concrete.
Through test comparison, when the same amount of fibers are adopted, the performance index detection conditions of the waterproof protective layer fiber concrete are as follows:
TABLE 2 index of performance of fiber concrete
Through concrete trial mixing results and comparison of performance index detection data, after the fibers are doped, the performance of the concrete is greatly changed, various index data are combined, the overall index performance of the doped PVA fibers is more advantageous, and particularly, cracks on the surface of the waterproof layer of the bridge deck under the same curing condition are obviously fewer, so that the PVA fibers are selected as the fibers used in the concrete of the waterproof layer of the bridge deck of the railway bridge.
Wherein, the PVA fiber incorporation amount is determined: respectively selecting PVA fiber mixing amounts of 0.05%, 0.1%, 0.15% and 0.2%, namely, the PVA fiber dosage of each side is 0.32kg, 0.63kg, 0.95kg and 1.26kg, the compressive strength of the fiber concrete is reduced along with the increase of the mixing amount, and the larger the mixing amount is, the more the compressive strength is reduced; the anti-splitting strength of the fiber concrete is improved along with the increase of the doping amount, and the effect is not obvious along with the increase of the doping amount of the fibers to a certain doping amount.
And (3) detecting the indexes of the fiber concrete protective layer:
TABLE 3 fiber concrete Performance index detection
From the analysis of the test data in Table 3, it can be seen that when the amount of PVA fiber is 0.15%, each side is 0.95kg, the concrete performance is most stable, so that it is determined that the amount is the optimal amount of the C40 bridge deck waterproof layer fiber concrete fiber.
As shown in figure 1, the pavement construction process comprises the following steps:
step one, measurement lofting: and (4) discharging the top elevation of the concrete protection layer on the ballast wall by a measurer, and popping out ink lines on the top of the ballast wall according to the elevation data, wherein the ink lines are used for adjusting the height of a walking rail of the leveling machine and controlling the integral elevation and the flatness of the bridge deck.
Step two, base layer treatment:
firstly, the surface of the base layer is inspected and accepted before the waterproof layer is constructed, and the base layer is dry, flat and free of sharp foreign matters, sand, skin and unevenness.
Secondly, when the requirements are not met, the mortar can be treated by a chiseling method, after chiseling is finished, the same grade of cement mortar is used for leveling, the substrate is required to be clean and wet when the cement mortar is leveled, and a proper amount of water-soluble adhesive for construction is added into the cement mortar to enhance the bonding between the cement mortar and the substrate.
Thirdly, the loose layer in the honeycomb and the pitted surface is removed at first by the bridge deck base layer, and then the cement mortar is used for filling and leveling. The concrete and the protruding parts on the top of the beam are manually removed, and floating slag, floating ash, oil stains and the like on the top surface of the beam are cleaned by a high-pressure air gun, an iron brush and the like.
And step three, paving and pasting the waterproof coiled material for construction.
First, a base treatment agent is knife coated. The bridge floor base layer is cleaned and dried before the base layer treating agent is scraped, and is sprayed on the surface of the base layer by a high-pressure spraying machine, positions which cannot be sprayed or are not sprayed uniformly are manually and uniformly scraped, the bottom surface is not leaked, the base layer is not accumulated, and the using amount of the treating agent per square meter is not less than 0.4 kg.
Secondly, paving and pasting the high polymer modified asphalt waterproof coiled material:
firstly, after the base course treating agent is coated for 2 hours, when the base course treating agent is dry and not sticky, the coiled material can be paved.
And the longitudinal and transverse lapping length of the waterproof coiled material is not less than 10 cm. And reserving the size of a lap joint on the surface of the base layer which is coated with the base layer treating agent and dried, and bouncing the datum line of the paved coiled material so as to carry out coiled material paving construction according to the datum line.
Thirdly, the coiled material is paved from one end and the bridge floor is transversely paved from low to high; the spray gun is ignited by a coiled material paving machine, the asphalt layer and the base layer treating agent on the bottom surface of the coiled material are baked uniformly, the asphalt layer is nearly flowing and black and bright, and the asphalt layer can be rolled and paved forwards after being melted. In order to ensure the bonding of the coiled material and the base layer, the coiled material should be paved and bonded while rolling, exhausting and bonding in the hot melting and paving process.
And fourthly, paving the bridge deck waterproof coiled material to the root parts of the ballast retaining walls and the vertical walls, and sealing edges by using polyurethane waterproof paint, wherein the height of the sealed edge is not less than 80mm, and the coating thickness is not less than 1.5 mm.
Fifthly, the waterproof coiled material is paved and adhered at the opening of the water drain pipe, the middle of the waterproof coiled material is provided with a hole and cut into a plurality of triangles to be tightly adhered to the lower inner wall of the water drain pipe opening.
Step four, constructing a concrete protective layer: after the waterproof layer is completely dried and qualified by the inspection of a supervision engineer, a C40 fiber concrete protective layer can be constructed after the through ground wire is laid.
First, fiber concrete is blended. The concrete is intensively mixed by a mixing station. The fiber concrete feeding sequence is that the aggregate and the fiber are mixed and stirred firstly, in order to prevent the fiber from being accurately and smoothly fed, a special adding device is adopted, then the cement, the admixture, the water and the admixture are added, and the stirring time is not less than 180 s.
And secondly, transporting the concrete. And (3) transporting the concrete tank truck to a construction site, and pumping the concrete tank truck to an upper bridge for pouring or directly pouring the concrete tank truck to an upper bridge chute. After the concrete is transported to a construction site, the performance index of the concrete of each truck is detected, and the concrete can be poured after the concrete is qualified.
And thirdly, concrete distribution. The concrete pouring is sequentially carried out from one end of the beam body to the other end, and the uniformly mixed fiber concrete is uniformly paved on the waterproof layer of the beam body.
Fourthly, vibrating the concrete. The vibration is carried out by a slurry lifting leveling machine, the speed of the slurry lifting leveling machine is required to be as slow as possible when the slurry lifting leveling machine travels, the vibration time of the fiber concrete is about 20s, and no visible cavity exists.
Fifthly, smearing. When the concrete is close to the initial setting, the surface can be plastered, the trowel is smooth so as not to bring out fibers, water is not required to be added during plastering, and the plastering frequency is not required to be excessive.
Sixthly, setting broken joints. The protective layer is longitudinally provided with transverse broken joints every 4m (the broken joints of the protective layer on the outer side of the ballast retaining wall are arranged at the positions of the expansion joints of the ballast retaining wall), the longitudinal broken joints are arranged at the center line of the beam body, the width of each broken joint is about 10mm, the depth of each broken joint is about 20mm, when the concrete strength of the protective layer reaches over 50% of the designed strength, the broken joints are filled and filled with polyurethane waterproof paint, and the protective layer and the beam body cannot be polluted when the broken joints are filled.
And seventhly, sealing the edge by using a seam. And sealing the joints of the protective layer, the ballast blocking wall and the vertical wall by using polyurethane waterproof paint, wherein the width of the sealed edge is not less than 8 cm.
And eighth, maintaining. After concrete pouring is finished, water retention maintenance measures are taken to avoid too fast water loss, during natural maintenance, the concrete is covered by the permeable geotextile, and the plastic film is covered on the geotextile, the watering frequency can keep the concrete surface to be fully moist, and the maintenance time meets the standard requirement.
Fifthly, brushing polyurethane waterproof paint and sealing edges;
firstly, cleaning the base layer again before painting the waterproof layer, and cleaning dust, sundries and the like on the painting surface.
Secondly, preparing and stirring the materials. The polyurethane coating consists of a main agent A and a curing agent B, and the components are proportioned according to the product specification, and the weighing error of each component is not more than +/-2%. Forcibly stirring for 3-5 min by using an electric stirrer until the mixture is fully and uniformly mixed. During stirring, water is not required to be added, mechanical stirring is required, and the rotating speed of a stirrer is preferably 200-300 r/min.
And thirdly, coating. The vertical parts of the ballast retaining wall, the vertical wall and the like are firstly coated by a brush, and the plane parts are coated by a plastic or rubber scraper and then scraped. The painting thickness is 2mm, the painting is carried out for 2 times, the painting is uniform, and the dosage per square meter is about 2.4kg/m2。
Fourthly, the prepared coating is used up within 20min and is used along with the preparation. No fan or similar means should be used to shorten the drying time.
Fifthly, frost, rain and sun exposure should be prevented within 12 hours after painting.
Sixth, test detection
And step six, detecting and controlling indexes including the thickness of the waterproof coating and the drawing bonding strength in site construction.
First, the thickness of the waterproof coating: the thickness of the waterproof coating is calculated according to the material usage, the design requirement of the polyurethane coating is 2.4kg per square meter, and the thickness is 2 mm. The quantity of the materials used by each hole beam of a construction unit must be checked and accepted through a supervision site, measured by a thickness gauge, and signed and confirmed after the materials are qualified. When the waterproof bonding layer is constructed, a supervision site and a side station must be used for supervision so as to ensure that the waterproof bonding layer material is really used for the corresponding construction bridge deck.
Second, pull bond strength: and after the waterproof layer protective layer reaches the design strength, drilling a core sample to detect the bonding strength of the concrete and the coiled material or the coating.
The test procedure was as follows:
firstly, drilling a core sample of A50mm by using drilling coring equipment, wherein the drilling depth is 5mm into a bridge deck base layer;
fixing a spindle with the diameter of 50mm on the surface of the protective layer of the tested core sample by using an adhesive;
thirdly, after the adhesive is cured, a portable adhesive force tester is used, a sleeve of the adhesive force tester is connected with the top end of the spindle, the hydraulic handle is uniformly pressed until the spindle is separated from the base material, and a test result is read.
Randomly drawing 1 hole or continuous 32m bridge deck per 10 holes or per 320m for detection, detecting 3 positions of each hole beam or continuous 32m bridge deck, judging that the bonding strength of the hole beam or the 32m bridge deck waterproof layer is unqualified, and performing hole-by-hole detection or continuous detection within the range of 320m for the beams; the part after core drilling is filled with polyurethane waterproof paint.
After the PVA fiber is doped, the generation of cracks is reduced, the later-stage crack repairing cost is saved, the labor cost is saved due to the use of novel construction equipment, and the construction period is shortened while the engineering quality is ensured. Taking a bridge deck waterproof layer of a certain railway project as an example, the construction period is saved by 20d from construction organization to construction completion, and 180 manual shifts are saved; the labor cost is 260 yuan/person.day, the total cost is saved by 46800 yuan, and the economic benefit is obvious.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that may be made by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention.
Claims (10)
1. Concrete containing PVA/PAN fibers, characterized in that: comprises the following components: 324kg of cement, 139kg of fly ash, 657-710 kg of medium sand, 1118-1129 kg of broken stone, 5.09kg of additive, 1kg of fiber and 162-98 kg of water.
2. The PVA/PAN fiber-containing concrete according to claim 1, wherein the medium sand has a particle size of 5 to 10 mm.
3. The PVA/PAN fiber containing concrete according to claim 1, wherein the fiber parameter is 15%.
4. A method of constructing a deck waterproofing layer using the PVA/PAN fiber-containing concrete according to any one of claims 1 to 3,
step one, measurement lofting: a measuring person discharges the top elevation of the concrete protection layer on the ballast wall, and pops out an ink line on the top of the ballast wall according to the elevation data, so as to adjust the height of a walking rail of the leveling machine and control the integral elevation and the flatness of the bridge deck;
step two, base layer treatment;
thirdly, paving and pasting a waterproof coiled material for construction;
step four, constructing a concrete protective layer: after the waterproof layer is completely dried and is qualified by the inspection of a supervision engineer, a C40 fiber concrete protective layer can be constructed after the through ground wire is laid;
fifthly, brushing polyurethane waterproof paint and sealing edges;
and step six, detecting control indexes in site construction.
5. The construction method according to claim 4, wherein in the second step, the base layer treatment specifically comprises:
firstly, checking and accepting a base layer surface before the waterproof layer is constructed;
secondly, processing by using a chiseling method, and leveling by using cement mortar after chiseling;
and thirdly, removing a loose layer of the bridge floor base, and filling the loose layer with cement mortar to be smooth.
6. The construction method according to claim 4, wherein the fifth step specifically comprises:
firstly, cleaning the base layer again before painting the waterproof layer;
secondly, preparing and stirring materials;
thirdly, coating; brushing vertical parts such as a ballast blocking wall, a vertical wall and the like by using a brush, and scraping and coating a plane part by using a plastic or rubber scraper;
fourthly, the prepared coating is used up within 20 min;
fifthly, frost, rain and sun exposure should be prevented within 12 hours after painting;
and sixthly, testing and detecting.
7. The construction method according to claim 4, wherein in the sixth step, the construction detection control indexes include waterproof paint thickness and drawing adhesion strength; the thickness of the waterproof coating is as follows: the thickness of the waterproof coating is calculated according to the material usage, the design requirement of the polyurethane coating is 2.4kg per square meter, and the thickness is 2 mm.
8. The construction method according to claim 7, wherein the drawing bond strength is: and after the waterproof layer protective layer reaches the design strength, drilling a core sample to detect the bonding strength of the concrete and the coiled material or the coating.
9. The construction method according to claim 8, wherein the testing step is as follows:
firstly, drilling a core sample of A50mm by using a drilling coring device, wherein the drilling depth enters a bridge deck base course for 5 mm;
secondly, fixing a spindle with the diameter of 50mm on the surface of the protective layer of the tested core sample by using an adhesive;
thirdly, after the adhesive is cured, connecting a sleeve of the adhesion tester with the top end of the spindle by using a portable adhesion tester, uniformly pressing a hydraulic handle until the spindle is separated from the base material, and reading a test result;
fourthly, randomly drawing 1 hole or continuous 32m bridge deck for detection every 10 holes or every 320m, judging that the bonding strength of the hole beam or the 32m bridge deck waterproof layer is unqualified when the data minimum single value of the hole beam or the continuous 32m bridge deck 3 is less than 0.08MPa at each hole beam or the continuous 32m bridge deck detection 3 position, and performing hole-by-hole detection or continuous detection within the range of 320m on the batch of beams; the part after core drilling is filled with polyurethane waterproof paint.
10. The construction method according to claim 6, wherein the material is prepared from a polyurethane coating material consisting of a main agent and a curing agent, and the weighing error of each component is not more than +/-2%; forcibly stirring for 3-5 min by using an electric stirrer until the mixture is fully and uniformly mixed; and (3) no water is added during stirring, mechanical stirring is carried out, and the rotating speed of a stirrer is 200-300 r/min.
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| CN109369095A (en) * | 2018-10-17 | 2019-02-22 | 同济大学 | Hybrid fiber concrete and its preparation method and application |
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| CN101863631A (en) * | 2010-06-21 | 2010-10-20 | 东南大学 | Stone aggregate wrapped by microfine fibre polymer mortar thin layer and preparation method thereof |
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