CN113336520A - High-speed rail concrete base layer repairing material and repairing method thereof - Google Patents
High-speed rail concrete base layer repairing material and repairing method thereof Download PDFInfo
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- CN113336520A CN113336520A CN202110110141.9A CN202110110141A CN113336520A CN 113336520 A CN113336520 A CN 113336520A CN 202110110141 A CN202110110141 A CN 202110110141A CN 113336520 A CN113336520 A CN 113336520A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
- C04B28/344—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
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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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/02—Phosphate cements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B37/00—Making, maintaining, renewing, or taking-up the ballastway or the track, not provided for in a single one of groups E01B27/00 - E01B35/00
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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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Curing Cements, Concrete, And Artificial Stone (AREA)
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Abstract
The invention discloses a high-iron concrete base layer repairing material and a repairing method thereof, belonging to the technical field of building repairing materials and repairing methods, wherein the repairing material is prepared by compounding and stirring magnesium ammonium phosphate cement, an additive, a mineral admixture, aggregate and fiber in a water environment, and has the following advantages: the high-strength and early-stage steel has high-strength characteristics, and can realize quick repair in a high-speed rail window period; the bonding force is strong and the linear expansion coefficient is close; the repair material has good durability, and can overcome the defects of easy aging and short service life of the organic repair material; the defect of brittle failure of the cement-based material is overcome; the repairing method adopts the nano permeable material to seal and reinforce the deteriorated concrete base layer, overcomes the defect that other repairing materials can not improve the performance of the concrete of the base layer, and enhances the bonding force between the base layer and the repairing layer; the method adopts independent packaging to meet the requirement of short window period, efficiently finishes the repair of the high-speed rail concrete base layer, and is suitable for large-area popularization.
Description
Technical Field
The invention belongs to the technical field of building repairing materials and repairing methods, and relates to a concrete base layer repairing material and a repairing method, in particular to a high-speed railway concrete base layer repairing material and a repairing method thereof.
Background
The CRTSII plate type ballastless track for constructing the high-speed railway in China has short period, large scale and little experience, and lacks of research on service performance, and the constructed high-speed railway is widely used all over the country. The base plate, the elastic mortar layer, the track plate and the like of the CRTSII type plate ballastless track are damaged and degraded to different degrees due to long-term complex operation environment, high-frequency use and load action (such as arch warping on the track plate, void and grout bleeding of the mortar layer, parting of a post-cast strip (wide and narrow seams), degradation of supporting layers and base plate concrete, degradation of lateral block concrete, degradation of the surface layer of a roadbed supporting layer, local looseness, fragmentation, chipping and the like), great inconvenience is brought to operation along relevant railways in China, and smoothness, durability and safety of the tracks are seriously damaged.
Aiming at the diseases of the ballastless track of the high-speed railway, the selected maintenance material and technology are cured in the skylight to ensure that the train passes on time and is matched with the raw materials of the diseased region, and simultaneously, the requirements of maintenance rules of the ballastless track line of the high-speed railway on various engineering and mechanical properties of the material are met, so that the material has proper setting time, good fluidity, high strength, enough bonding strength and elastic modulus with the raw materials, and good durability. At present, inorganic materials generally used for rapid maintenance of ballastless tracks mainly comprise quick-setting cement mortar, cement-emulsified asphalt and the like. The quick-drying cement mortar is quick to set and harden, can be hardened within a few minutes, and can meet the requirements of emergency repair engineering.
However, the adhesive strength and the self strength of the repair material are low, so that the application range of the repair material is limited, the repair material is generally applied to maintenance of non-stressed parts, and once the repair material is used on stressed parts, secondary damage is easily caused. The cement emulsified asphalt mortar serving as a repairing material of a mortar layer has good matching performance with an original mortar layer, but has poor corrosion resistance and freeze-thaw resistance, and generally generates secondary damage of different degrees 3-5 years after maintenance. The organic repairing material for the rapid maintenance of the ballastless track mainly comprises epoxy resin, vinyl resin, isobutylene resin, organic silicon material and the like, and the organic materials have good 'secondary' maintainability, do not need to remove old materials and can be directly covered for maintenance. However, these polymeric materials have inherent drawbacks such as aging, complicated construction conditions, high cost, environmental protection, etc. In addition, the existing repairing method can not improve the defect of concrete performance, and can not rapidly repair the concrete in the window period of the high-speed rail. Therefore, high requirements are put on the performance of the repair material and the repair method.
Disclosure of Invention
The invention aims to solve the problems that the existing repairing material has poor performance, complex construction conditions and high cost, and is not suitable for the repairing construction of high-speed rail concrete foundations; the existing repairing method can not improve the defect of concrete performance and can not rapidly repair the concrete in the window period of the high-speed rail.
In order to achieve the purpose, the invention provides the following technical scheme: a high-iron concrete base layer repairing material is formed by compounding and stirring magnesium ammonium phosphate cement, an additive, a mineral admixture, aggregate and fibers in a water environment, wherein the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to water is 1: 0.1-0.15; the weight ratio of the additive to the magnesium ammonium phosphate cement is 0.01-0.03: 1; the volume ratio of the fibers to the magnesium ammonium phosphate cement is 0-0.005: 1; the magnesium ammonium phosphate cement is composed of magnesium oxide powder, ammonium dihydrogen phosphate and a composite retarder, wherein the composite retarder is composed of borax, disodium hydrogen phosphate and organic acid; the additive is sodium silicate liquid, and the modulus of the additive is 2.8-4.0; the repair material adopts mineral admixture to replace magnesia powder in an equivalent manner, the replacement amount of the mineral admixture is 0-20% of the weight percentage of the magnesia powder, and the mineral admixture comprises 0-100% of fly ash and 0-100% of metakaolin according to the weight percentage.
Preferably, the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the water is 1: 0.1; the magnesium ammonium phosphate cement comprises 54-68% of magnesium oxide powder, 19-20% of ammonium dihydrogen phosphate and 8-13% of a composite retarder by weight percentage; wherein the compound retarder comprises 48-56% of borax, 41-48% of disodium hydrogen phosphate and 3-6% of acetic acid; the fibers are glass fibers.
Preferably, the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the water is 1: 0.12; the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the aggregate is 1: 1; according to the weight percentage, the magnesium ammonium phosphate cement comprises 49-60% of magnesium oxide powder, 29-31% of ammonium dihydrogen phosphate and 8-11% of composite retarder; wherein the compound retarder comprises 46-56% of borax, 40-48% of disodium hydrogen phosphate and 3-7% of acetic acid; the aggregate is quartz sand, and the fiber is glass fiber.
Preferably, the purity of the ammonium dihydrogen phosphate is 98%, the purity of the magnesium oxide powder is more than 90%, and the mesh number is 180-220.
Preferably, the metakaolin mesh number is 1250-3000, and the fly ash is class I fly ash.
Preferably, the quartz sand comprises 50-70% of quartz sand with the grain diameter of 2-4mm and 30-70% of quartz sand with the grain diameter of 3-5mm in percentage by weight.
A construction method for repairing a concrete foundation by using any one of the high-speed railway concrete base layer repairing materials comprises the following steps:
(1) preparing component materials required by the repair material according to the weight, and bagging each component material by adopting independent packaging; constructing at negative temperature, wherein the temperature of the adopted water is more than or equal to 80 ℃;
(2) performing chiseling treatment on the concrete to be repaired, and cleaning dust at the chiseling position;
(3) erecting a template, and spraying a nano-penetration material at the scabbed position to thoroughly wet the substrate in a water-retaining state;
(4) stirring the component materials according to the feeding sequence to prepare a repairing material, and then pouring the repairing material at the position needing repairing;
(5) and (3) after repairing, manufacturing test blocks under the same condition, and detecting the strength of different ages by adopting 40 mm-160 mm prism test blocks in the size of the test block.
Preferably, the step of feeding and sequentially stirring the component materials comprises the following steps:
(1) firstly, putting ammonium dihydrogen phosphate, borax, an additive, disodium hydrogen phosphate and 1/3 total water consumption in a stirring container, and stirring for 2-3 min;
(2) then adding magnesium oxide powder, mineral admixture and 1/3 total water consumption to stir for 5-6 min;
(3) finally adding quartz sand, glass fiber and 1/3 total water consumption, and stirring for 2-3 min.
Preferably, the construction time of the construction method is within 20 min.
Has the advantages that: the repair material of the invention has the following advantages: (1) the high-strength and early-stage steel has high-strength characteristics, and can realize quick repair in a high-speed rail window period; (2) the adhesive force is strong, the linear expansion coefficient is close, and the micro-expansion characteristic is realized during hardening, so that the defects of poor adhesive force and poor compatibility between the existing repairing material and the base concrete can be overcome; (3) the repair material has good durability, and can overcome the defects of easy aging and short service life of the organic repair material; (4) overcomes the defect of brittle failure of cement-based materials.
The repairing method adopts the nano permeable material to seal and reinforce the deteriorated concrete base layer, overcomes the defect that other repairing materials can not improve the performance of the concrete of the base layer, and enhances the bonding force between the base layer and the repairing layer; the repair material has the advantages that the construction speed is accelerated, the independent package is adopted to meet the requirement of short window period, the repair of the degraded concrete of the high-speed rail ballastless track bed plate/supporting layer is efficiently finished, and the repair material is suitable for large-area popularization.
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit and substance of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
Example 1:
a high-iron concrete base layer repairing material is prepared by compounding and stirring magnesium ammonium phosphate cement, an additive, a mineral admixture, an aggregate and fibers in a water environment, wherein the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to water is 1: 0.1; the weight ratio of the additive to the magnesium ammonium phosphate cement is 0.02: 1; the volume ratio of the fiber to the magnesium ammonium phosphate cement is 0.005: 1; the magnesium ammonium phosphate cement consists of magnesium oxide powder, ammonium dihydrogen phosphate and a composite retarder, wherein the composite retarder consists of borax, disodium hydrogen phosphate and organic acid; the additive is sodium silicate liquid, and the modulus of the additive is 2.8-4.0; the repair material adopts mineral admixture to replace magnesia powder in equal amount, the replacing amount is 0 percent of the weight percentage of the magnesia powder, and the mineral admixture comprises 0 percent of fly ash and 0 percent of metakaolin according to the weight percentage.
The weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the water is 1: 0.1; the magnesium ammonium phosphate cement comprises 68.22 percent of magnesium oxide powder, 19.5 percent of ammonium dihydrogen phosphate and 12.3 percent of composite retarder by weight percentage; wherein, the compound retarder comprises 55.6 percent of borax, 41.6 percent of disodium hydrogen phosphate and 2.7 percent of organic acid; the fibers are glass fibers.
Wherein, the purity of the ammonium dihydrogen phosphate is 98 percent, the purity of the magnesium oxide powder is more than 90 percent, and the mesh number is 180-220; the metakaolin mesh number is 1250-3000, and the fly ash is I-class fly ash.
The first scheme comprises the following specific contents: 100g of magnesium oxide, 0g of fly ash, 0g of metakaolin, 28.57g of ammonium salt, 18g of composite retarder, 2 g of additive, 0g of fiber, 0g of aggregate and 14.67g of water, and the data of the strength, the positive tensile bond strength and the deformation value of different ages in the first scheme can be obtained from the tables 1, 2 and 3, so that the performance of the composite retarder can be proved.
A construction method for repairing concrete foundation by using the high-speed rail concrete base layer repairing material comprises the following steps:
(1) preparing component materials required by the repair material according to the weight, and bagging each component material by adopting independent packaging; constructing at negative temperature, wherein the temperature of the adopted water is more than 85 ℃;
(2) performing chiseling treatment on the concrete to be repaired, and cleaning dust at the chiseling position; the chiseling position can adopt a high-power electric hair drier to clean the dust on the surface;
(3) erecting a template, and spraying a nano-penetration material at the scabbed position to thoroughly wet the substrate in a water-retaining state; therefore, the base layer can be prevented from absorbing the moisture in the magnesium phosphate cement in the construction process, and the binding power between the base layer and the magnesium phosphate cement is improved;
(4) stirring the component materials according to the feeding sequence to prepare a repairing material, and then pouring the repairing material at the position needing repairing;
(5) and (3) after repairing, manufacturing test blocks under the same condition, and detecting the strength of different ages by adopting 40 mm-160 mm prism test blocks in the size of the test block.
The steps of feeding and sequentially stirring the component materials are as follows:
(1) firstly, putting ammonium dihydrogen phosphate, borax, an additive, disodium hydrogen phosphate and 1/3 total water consumption in a stirring container, and stirring for 2-3 min;
(2) then adding magnesia powder, mineral admixture and 1/3 total water amount, stirring for 5-6min,
(3) finally adding glass fiber and 1/3 total water, and stirring for 2-3 min.
The construction method has the construction time within 20min, and the required machines for construction mainly comprise a plurality of high-power stirrers, a plurality of stirring barrels, an electronic scale, a plurality of barrels, a blower, a dust collector and a hammer.
Example 2:
a high-iron concrete base layer repairing material is prepared by compounding and stirring magnesium ammonium phosphate cement, an additive, a mineral admixture, an aggregate and fibers in a water environment, wherein the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to water is 1: 0.1; the weight ratio of the additive to the magnesium ammonium phosphate cement is 0.02: 1; the volume ratio of the fiber to the magnesium ammonium phosphate cement is 0.005: 1; the magnesium ammonium phosphate cement consists of magnesium oxide powder, ammonium dihydrogen phosphate and a composite retarder, wherein the composite retarder consists of borax, disodium hydrogen phosphate and organic acid; the additive is sodium silicate liquid, and the modulus of the additive is 2.8-4.0; the repair material adopts mineral admixture to replace magnesia powder in equal amount, the replacing amount is 20% of magnesia powder weight percentage, the mineral admixture comprises 50% of fly ash and 50% of metakaolin according to weight percentage.
The weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the water is 1: 0.1; the magnesium ammonium phosphate cement comprises 54.6 percent of magnesium oxide powder, 19.5 percent of ammonium dihydrogen phosphate and 12.3 percent of composite retarder by weight percentage; wherein, the compound retarder comprises 55.6 percent of borax, 41.7 percent of disodium hydrogen phosphate and 2.7 percent of organic acid; the fibers are glass fibers.
Wherein, the purity of the ammonium dihydrogen phosphate is 98 percent, the purity of the magnesium oxide powder is more than 90 percent, and the mesh number is 180-220; the metakaolin mesh number is 1250-3000, and the fly ash is I-class fly ash.
The second scheme comprises the following specific contents: 80g of magnesium oxide, 10g of fly ash, 10g of metakaolin, 28.57g of ammonium salt, 18g of composite retarder, 2 g of additive, 1.4g of fiber, 0g of aggregate and 14.67g of water, and the data of the strength, the positive tensile bond strength and the deformation value of the second scheme at different ages can be obtained from the tables 1, 2 and 3, and the performances of the second scheme can be proved.
A construction method for repairing concrete foundation by using the high-speed rail concrete base layer repairing material comprises the following steps:
(1) preparing component materials required by the repair material according to the weight, and bagging each component material by adopting independent packaging; constructing at negative temperature, wherein the temperature of the adopted water is more than 85 ℃;
(2) performing chiseling treatment on the concrete to be repaired, and cleaning dust at the chiseling position; the chiseling position can adopt a high-power electric hair drier to clean the dust on the surface;
(3) erecting a template, and spraying a nano-penetration material at the scabbed position to thoroughly wet the substrate in a water-retaining state; therefore, the base layer can be prevented from absorbing the moisture in the magnesium phosphate cement in the construction process, and the binding power between the base layer and the magnesium phosphate cement is improved;
(4) stirring the component materials according to the feeding sequence to prepare a repairing material, and then pouring the repairing material at the position needing repairing;
(5) and (3) after repairing, manufacturing test blocks under the same condition, and detecting the strength of different ages by adopting 40 mm-160 mm prism test blocks in the size of the test block.
The steps of feeding and sequentially stirring the component materials are as follows:
(1) firstly, putting ammonium dihydrogen phosphate, borax, an additive, disodium hydrogen phosphate and 1/3 total water consumption in a stirring container, and stirring for 2-3 min;
(2) then adding magnesia powder, mineral admixture and 1/3 total water amount, stirring for 5-6min,
(3) finally adding glass fiber and 1/3 total water, and stirring for 2-3 min.
The construction method has the construction time within 20min, and the required machines for construction mainly comprise a plurality of high-power stirrers, a plurality of stirring barrels, an electronic scale, a plurality of barrels, a blower, a dust collector and a hammer.
Example 3:
a high-iron concrete base layer repairing material is prepared by compounding and stirring magnesium ammonium phosphate cement, an additive, a mineral admixture, an aggregate and fibers in a water environment, wherein the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to water is 1: 0.1; the weight ratio of the additive to the magnesium ammonium phosphate cement is 0.01: 1; the volume ratio of the fiber to the magnesium ammonium phosphate cement is 0.005: 1; the magnesium ammonium phosphate cement consists of magnesium oxide powder, ammonium dihydrogen phosphate and a composite retarder, wherein the composite retarder consists of borax, disodium hydrogen phosphate and organic acid; the additive is sodium silicate liquid, and the modulus of the additive is 2.8-4.0; the repair material adopts mineral admixture to replace magnesia powder in equal amount, the replacing amount is 20% of magnesia powder weight percentage, the mineral admixture comprises 50% of fly ash and 50% of metakaolin according to weight percentage.
The weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the water is 1: 0.1; the magnesium ammonium phosphate cement comprises 56.5 percent of magnesium oxide powder, 20.2 percent of ammonium dihydrogen phosphate and 9.2 percent of composite retarder by weight percentage; wherein, the compound retarder comprises 38.5 percent of borax, 57.7 percent of disodium hydrogen phosphate and 3.8 percent of organic acid; the fibers are glass fibers.
Wherein, the purity of the ammonium dihydrogen phosphate is 98 percent, the purity of the magnesium oxide powder is more than 90 percent, and the mesh number is 180-220; the metakaolin mesh number is 1250-3000, and the fly ash is I-class fly ash.
The third scheme comprises the following specific contents: 80g of magnesium oxide, 10g of fly ash, 10g of metakaolin, 28.57g of ammonium salt, 13g of composite retarder, 2 g of additive, 0g of fiber, 0g of aggregate and 14.67g of water, and the data of the strength, the positive tensile bond strength and the deformation value of the third scheme at different ages can be obtained from the tables 1, 2 and 3, so that the performance of the composite retarder can be proved.
A construction method for repairing concrete foundation by using the high-speed rail concrete base layer repairing material comprises the following steps:
(1) preparing component materials required by the repair material according to the weight, and bagging each component material by adopting independent packaging; constructing at negative temperature, wherein the temperature of the adopted water is more than 85 ℃;
(2) performing chiseling treatment on the concrete to be repaired, and cleaning dust at the chiseling position; the chiseling position can adopt a high-power electric hair drier to clean the dust on the surface;
(3) erecting a template, and spraying a nano-penetration material at the scabbed position to thoroughly wet the substrate in a water-retaining state; therefore, the base layer can be prevented from absorbing the moisture in the magnesium phosphate cement in the construction process, and the binding power between the base layer and the magnesium phosphate cement is improved;
(4) stirring the component materials according to the feeding sequence to prepare a repairing material, and then pouring the repairing material at the position needing repairing;
(5) and (3) after repairing, manufacturing test blocks under the same condition, and detecting the strength of different ages by adopting 40 mm-160 mm prism test blocks in the size of the test block.
The steps of feeding and sequentially stirring the component materials are as follows:
(1) firstly, putting ammonium dihydrogen phosphate, borax, an additive, disodium hydrogen phosphate and 1/3 total water consumption in a stirring container, and stirring for 2-3 min;
(2) then adding magnesia powder, mineral admixture and 1/3 total water amount, stirring for 5-6min,
(3) finally adding glass fiber and 1/3 total water, and stirring for 2-3 min.
The construction method has the construction time within 20min, and the required machines for construction mainly comprise a plurality of high-power stirrers, a plurality of stirring barrels, an electronic scale, a plurality of barrels, a blower, a dust collector and a hammer.
Example 4:
a high-iron concrete base layer repairing material is prepared by compounding and stirring magnesium ammonium phosphate cement, an additive, a mineral admixture, an aggregate and fibers in a water environment, wherein the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to water is 1: 0.12; the weight ratio of the additive to the magnesium ammonium phosphate cement is 0.02: 1; the volume ratio of the fiber to the magnesium ammonium phosphate cement is 0.005: 1; the magnesium ammonium phosphate cement consists of magnesium oxide powder, ammonium dihydrogen phosphate and a composite retarder, wherein the composite retarder consists of borax, disodium hydrogen phosphate and organic acid; the additive is sodium silicate liquid, and the modulus of the additive is 2.8-4.0; the repair material adopts mineral admixture to replace magnesia powder in equal amount, the replacing amount is 0 percent of the weight percentage of the magnesia powder, and the mineral admixture comprises 50 percent of fly ash and 50 percent of metakaolin according to the weight percentage.
The weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the water is 1: 0.12; the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the aggregate is 1: 1; the magnesium ammonium phosphate cement comprises 59.5 percent of magnesium oxide powder, 29.8 percent of ammonium dihydrogen phosphate and 10.7 percent of composite retarder by weight percentage; wherein, the compound retarder comprises 55.6 percent of borax, 41.7 percent of disodium hydrogen phosphate and 2.7 percent of organic acid; the aggregate is quartz sand.
Wherein, the purity of the ammonium dihydrogen phosphate is 98 percent, the purity of the magnesium oxide powder is more than 90 percent, and the mesh number is 180-220; the metakaolin mesh number is 1250-3000, and the fly ash is I-grade fly ash; according to the weight percentage, the quartz sand comprises 50-70% of quartz sand with the grain diameter of 2-4mm and 30-70% of quartz sand with the grain diameter of 3-5 mm.
The fourth scheme comprises the following specific contents: the strength, the positive tensile bonding strength and the deformation value of the scheme IV at different ages can be obtained from the data in the tables 1, 2 and 3, and the performance can be proved.
A construction method for repairing concrete foundation by using the high-speed rail concrete base layer repairing material comprises the following steps:
(1) preparing component materials required by the repair material according to the weight, and bagging each component material by adopting independent packaging; constructing at negative temperature, wherein the temperature of the adopted water is more than 85 ℃;
(2) performing chiseling treatment on the concrete to be repaired, and cleaning dust at the chiseling position; the chiseling position can adopt a high-power electric hair drier to clean the dust on the surface;
(3) erecting a template, and spraying a nano-penetration material at the scabbed position to thoroughly wet the substrate in a water-retaining state; therefore, the base layer can be prevented from absorbing the moisture in the magnesium phosphate cement in the construction process, and the binding power between the base layer and the magnesium phosphate cement is improved;
(4) stirring the component materials according to the feeding sequence to prepare a repairing material, and then pouring the repairing material at the position needing repairing;
(5) and (3) after repairing, manufacturing test blocks under the same condition, and detecting the strength of different ages by adopting 40 mm-160 mm prism test blocks in the size of the test block.
The steps of feeding and sequentially stirring the component materials are as follows:
(1) firstly, putting ammonium dihydrogen phosphate, borax, an additive, disodium hydrogen phosphate and 1/3 total water consumption in a stirring container, and stirring for 2-3 min;
(2) then adding magnesia powder, mineral admixture and 1/3 total water amount, stirring for 5-6min,
(3) finally adding glass fiber and 1/3 total water, and stirring for 2-3 min.
The construction method has the construction time within 20min, and the required machines for construction mainly comprise a plurality of high-power stirrers, a plurality of stirring barrels, an electronic scale, a plurality of barrels, a blower, a dust collector and a hammer.
Example 5:
a high-iron concrete base layer repairing material is prepared by compounding and stirring magnesium ammonium phosphate cement, an additive, a mineral admixture, an aggregate and fibers in a water environment, wherein the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to water is 1: 0.12; the weight ratio of the additive to the magnesium ammonium phosphate cement is 0.01: 1; the volume ratio of the fiber to the magnesium ammonium phosphate cement is 0.005: 1; the magnesium ammonium phosphate cement consists of magnesium oxide powder, ammonium dihydrogen phosphate and a composite retarder, wherein the composite retarder consists of borax, disodium hydrogen phosphate and organic acid; the additive is sodium silicate liquid, and the modulus of the additive is 2.8-4.0; the repair material adopts mineral admixture to replace magnesia powder in equal amount, the replacing amount is 20% of magnesia powder weight percentage, the mineral admixture comprises 50% of fly ash and 50% of metakaolin according to weight percentage.
The weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the water is 1: 0.12; the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the aggregate is 1: 1; the magnesium ammonium phosphate cement comprises 47.6 percent of magnesium oxide powder, 29.8 percent of ammonium dihydrogen phosphate and 10.7 percent of composite retarder by weight percentage; wherein, the compound retarder comprises 55.6 percent of borax, 41.7 percent of disodium hydrogen phosphate and 2.7 percent of organic acid; the aggregate is quartz sand, and the fiber is glass fiber.
Wherein, the purity of the ammonium dihydrogen phosphate is 98 percent, the purity of the magnesium oxide powder is more than 90 percent, and the mesh number is 180-220; the metakaolin mesh number is 1250-3000, and the fly ash is I-grade fly ash; according to the weight percentage, the quartz sand comprises 60 percent of quartz sand with the grain diameter of 2-4mm and 40 percent of quartz sand with the grain diameter of 3-5 mm.
The fifth concrete content is as follows: 80g of magnesium oxide, 10g of fly ash, 10g of metakaolin, 50g of ammonium salt, 18g of composite retarder, 2 g of additive, 1.4g of fiber, 168g of aggregate and 20.16g of water, and the data of the strength, the positive tensile bonding strength and the deformation value of the fifth scheme at different ages can be obtained from the tables 1, 2 and 3, so that the performance of the fifth scheme can be proved.
A construction method for repairing concrete foundation by using the high-speed rail concrete base layer repairing material comprises the following steps:
(1) preparing component materials required by the repair material according to the weight, and bagging each component material by adopting independent packaging; constructing at negative temperature, wherein the temperature of the adopted water is more than 85 ℃;
(2) performing chiseling treatment on the concrete to be repaired, and cleaning dust at the chiseling position; the chiseling position can adopt a high-power electric hair drier to clean the dust on the surface;
(3) erecting a template, and spraying a nano-penetration material at the scabbed position to thoroughly wet the substrate in a water-retaining state; therefore, the base layer can be prevented from absorbing the moisture in the magnesium phosphate cement in the construction process, and the binding power between the base layer and the magnesium phosphate cement is improved;
(4) stirring the component materials according to the feeding sequence to prepare a repairing material, and then pouring the repairing material at the position needing repairing;
(5) and (3) after repairing, manufacturing test blocks under the same condition, and detecting the strength of different ages by adopting 40 mm-160 mm prism test blocks in the size of the test block.
The steps of feeding and sequentially stirring the component materials are as follows:
(1) firstly, putting ammonium dihydrogen phosphate, borax, an additive, disodium hydrogen phosphate and 1/3 total water consumption in a stirring container, and stirring for 2-3 min;
(2) then adding magnesia powder, mineral admixture and 1/3 total water amount, stirring for 5-6min,
(3) finally adding glass fiber and 1/3 total water, and stirring for 2-3 min.
The construction method has the construction time within 20min, and the required machines for construction mainly comprise a plurality of high-power stirrers, a plurality of stirring barrels, an electronic scale, a plurality of barrels, a blower, a dust collector and a hammer.
Example 6:
a high-iron concrete base layer repairing material is prepared by compounding and stirring magnesium ammonium phosphate cement, an additive, a mineral admixture, an aggregate and fibers in a water environment, wherein the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to water is 1: 0.12; the weight ratio of the additive to the magnesium ammonium phosphate cement is 0.02: 1; the volume ratio of the fiber to the magnesium ammonium phosphate cement is 0.005: 1; the magnesium ammonium phosphate cement consists of magnesium oxide powder, ammonium dihydrogen phosphate and a composite retarder, wherein the composite retarder consists of borax, disodium hydrogen phosphate and organic acid; the additive is sodium silicate liquid, and the modulus of the additive is 2.8-4.0; the repair material adopts mineral admixture to replace magnesia powder in equal amount, the replacing amount is 20% of magnesia powder weight percentage, the mineral admixture comprises 50% of fly ash and 50% of metakaolin according to weight percentage.
The weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the water is 1: 0.12; the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the aggregate is 1: 1; the magnesium ammonium phosphate cement comprises 49.1 percent of magnesium oxide powder, 30.7 percent of ammonium dihydrogen phosphate and 8.0 percent of composite retarder by weight percentage; wherein, the compound retarder comprises 38.5 percent of borax, 57.7 percent of disodium hydrogen phosphate and 3.8 percent of organic acid; the aggregate is quartz sand.
Wherein, the purity of the ammonium dihydrogen phosphate is 98 percent, the purity of the magnesium oxide powder is more than 90 percent, and the mesh number is 180-220; the metakaolin mesh number is 1250-3000, and the fly ash is I-grade fly ash; the quartz sand comprises 40 percent of quartz sand with the grain diameter of 2-4mm and 60 percent of quartz sand with the grain diameter of 3-5mm according to weight percentage.
The six concrete contents of the scheme are as follows: 80g of magnesium oxide, 10g of fly ash, 10g of metakaolin, 50g of ammonium salt, 13g of composite retarder, 2 g of additive, 0g of fiber, 163g of aggregate and 19.56g of water, and the data of the strength, the positive tensile bonding strength and the deformation value of different ages in the sixth scheme can be obtained from the tables 1, 2 and 3, so that the performance of the composite retarder can be proved.
A construction method for repairing concrete foundation by using the high-speed rail concrete base layer repairing material comprises the following steps:
(1) preparing component materials required by the repair material according to the weight, and bagging each component material by adopting independent packaging; constructing at negative temperature, wherein the temperature of the adopted water is more than 85 ℃;
(2) performing chiseling treatment on the concrete to be repaired, and cleaning dust at the chiseling position; the chiseling position can adopt a high-power electric hair drier to clean the dust on the surface;
(3) erecting a template, and spraying a nano-penetration material at the scabbed position to thoroughly wet the substrate in a water-retaining state; therefore, the base layer can be prevented from absorbing the moisture in the magnesium phosphate cement in the construction process, and the binding power between the base layer and the magnesium phosphate cement is improved;
(4) stirring the component materials according to the feeding sequence to prepare a repairing material, and then pouring the repairing material at the position needing repairing;
(5) and (3) after repairing, manufacturing test blocks under the same condition, and detecting the strength of different ages by adopting 40 mm-160 mm prism test blocks in the size of the test block.
The steps of feeding and sequentially stirring the component materials are as follows:
(1) firstly, putting ammonium dihydrogen phosphate, borax, an additive, disodium hydrogen phosphate and 1/3 total water consumption in a stirring container, and stirring for 2-3 min;
(2) then adding magnesia powder, mineral admixture and 1/3 total water amount, stirring for 5-6min,
(3) finally adding glass fiber and 1/3 total water, and stirring for 2-3 min.
The construction method has the construction time within 20min, and the required machines for construction mainly comprise a plurality of high-power stirrers, a plurality of stirring barrels, an electronic scale, a plurality of barrels, a blower, a dust collector and a hammer.
The experimental data for the above examples are as follows for strength, positive tensile bond strength and deformation values at different ages:
TABLE 1 Strength at different ages
The experimental data values of the flexural strength and the compressive strength of the first scheme to the sixth scheme in each embodiment of different ages can be obtained from the table 1, the strength is rapidly improved, and the performance is good;
TABLE 2 Positive tensile bond strengths of different ages
From table 2, experimental data values of the bonding strength of the first to sixth embodiments in different ages can be obtained, and it can be seen that the repair material has strong bonding force.
TABLE 3 deformation values at different ages
From table 3, the experimental data values of the longitudinal deformation values of the first to sixth embodiments in different ages can be obtained, and it can be known that the repair material has good deformation resistance.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The high-iron concrete base layer repairing material is characterized by being prepared by compounding and stirring magnesium ammonium phosphate cement, an additive, a mineral admixture, aggregate and fibers in a water environment, wherein the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to water is 1: 0.1-0.15; the weight ratio of the additive to the magnesium ammonium phosphate cement is 0.01-0.03: 1; the volume ratio of the fibers to the magnesium ammonium phosphate cement is 0-0.005: 1; the magnesium ammonium phosphate cement is composed of magnesium oxide powder, ammonium dihydrogen phosphate and a composite retarder, wherein the composite retarder is composed of borax, disodium hydrogen phosphate and organic acid; the additive is sodium silicate liquid, and the modulus of the additive is 2.8-4.0; the repair material adopts mineral admixture to replace magnesia powder in an equivalent manner, the replacement amount of the mineral admixture is 0-20% of the weight percentage of the magnesia powder, and the mineral admixture comprises 0-100% of fly ash and 0-100% of metakaolin according to the weight percentage.
2. The high-iron concrete base layer patching material of claim 1, wherein the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to water is 1: 0.1; the magnesium ammonium phosphate cement comprises 54-68% of magnesium oxide powder, 19-20% of ammonium dihydrogen phosphate and 8-13% of a composite retarder by weight percentage; wherein the compound retarder comprises 48-56% of borax, 41-48% of disodium hydrogen phosphate and 3-6% of acetic acid; the fibers are glass fibers.
3. The high-iron concrete base layer patching material of claim 1, wherein the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to water is 1: 0.12; the weight ratio of the sum of the magnesium ammonium phosphate cement and the mineral admixture to the aggregate is 1: 1; according to the weight percentage, the magnesium ammonium phosphate cement comprises 49-60% of magnesium oxide powder, 29-31% of ammonium dihydrogen phosphate and 8-11% of composite retarder; wherein the compound retarder comprises 46-56% of borax, 40-48% of disodium hydrogen phosphate and 3-7% of acetic acid; the aggregate is quartz sand, and the fiber is glass fiber.
4. The high-iron concrete-based layer repair material as claimed in claim 2 or 3, wherein the purity of the ammonium dihydrogen phosphate is 98%, the purity of the magnesium oxide powder is greater than 90%, and the mesh number is 180-220.
5. The material as claimed in claim 2 or 3, wherein the metakaolin has a mesh number of 1250-.
6. The high-iron concrete base layer repairing material according to claim 2 or 3, wherein the quartz sand comprises 50-70% of particles with a particle size of 2-4mm and 30-70% of particles with a particle size of 3-5mm by weight percentage.
7. A construction method for repairing a concrete foundation using the high-speed railway concrete-based repair material according to any one of claims 1 to 6, comprising the steps of:
(1) preparing component materials required by the repair material according to the weight, and bagging each component material by adopting independent packaging; constructing at negative temperature, wherein the temperature of the adopted water is more than or equal to 80 ℃;
(2) performing chiseling treatment on the concrete to be repaired, and cleaning dust at the chiseling position;
(3) erecting a template, and spraying a nano-penetration material at the scabbed position to thoroughly wet the substrate in a water-retaining state;
(4) stirring the component materials according to the feeding sequence to prepare a repairing material, and then pouring the repairing material at the position needing repairing;
(5) and (3) after repairing, manufacturing test blocks under the same condition, and detecting the strength of different ages by adopting 40 mm-160 mm prism test blocks in the size of the test block.
8. A construction method for repairing a concrete foundation according to claim 7, wherein said step of feeding the sequentially stirred component materials comprises:
(1) firstly, putting ammonium dihydrogen phosphate, borax, an additive, disodium hydrogen phosphate and 1/3 total water consumption in a stirring container, and stirring for 2-3 min;
(2) then adding magnesium oxide powder, mineral admixture and 1/3 total water consumption to stir for 5-6 min;
(3) finally adding quartz sand, glass fiber and 1/3 total water consumption, and stirring for 2-3 min.
9. A construction method for repairing a concrete foundation according to claim 7 or 8, wherein the construction time of said construction method is within 20 min.
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| CN115448687A (en) * | 2022-10-18 | 2022-12-09 | 中铁第四勘察设计院集团有限公司 | Magnesium ammonium phosphate cement-based composite material and preparation method and application thereof |
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