CN110981327A - Modified rubber particle anti-abrasion ultra-high-toughness concrete and preparation method thereof - Google Patents

Modified rubber particle anti-abrasion ultra-high-toughness concrete and preparation method thereof Download PDF

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CN110981327A
CN110981327A CN201910949201.9A CN201910949201A CN110981327A CN 110981327 A CN110981327 A CN 110981327A CN 201910949201 A CN201910949201 A CN 201910949201A CN 110981327 A CN110981327 A CN 110981327A
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modified rubber
concrete
rubber particle
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abrasion
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徐思钰
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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
    • C04B28/02—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 hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/48—Metal
    • 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
    • C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B16/04—Macromolecular compounds
    • C04B16/06—Macromolecular compounds fibrous
    • C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B16/0641—Polyvinylalcohols; Polyvinylacetates
    • 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
    • C04B18/04—Waste materials; Refuse
    • C04B18/18—Waste materials; Refuse organic
    • C04B18/20—Waste materials; Refuse organic from macromolecular compounds
    • C04B18/22—Rubber, e.g. ground waste tires
    • 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
    • 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
    • C04B20/10—Coating or impregnating
    • C04B20/1055—Coating or impregnating with inorganic materials
    • C04B20/1062—Metals
    • 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
    • C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
    • 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
    • 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)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Civil Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a modified rubber particle anti-impact and anti-grinding ultrahigh-toughness concrete which is prepared by taking cement, fly ash microbeads, silica fume, machine-made sand, modified rubber particles, hybrid fibers, an interface reinforcing agent, a composite expanding agent, a shrinkage-reducing and viscosity-reducing water reducing agent and water as main raw materials. The modified rubber particle anti-abrasion ultra-high-toughness concrete has excellent anti-impact toughness and abrasion resistance, good volume stability and high interface bonding strength of new and old concrete; the method can be widely applied to the fields of construction, repair and reinforcement of hydraulic buildings such as bridge piers and the like, improves the bearing capacity and service life of the hydraulic buildings such as the bridge piers and the like, reduces the maintenance cost, realizes effective utilization of wastes, solves the problems of scarcity of quartz sand and river sand resources and the like in China, and has important economic and environmental benefits.

Description

Modified rubber particle anti-abrasion ultra-high-toughness concrete and preparation method thereof
Technical Field
The invention belongs to the field of building materials, and particularly relates to modified rubber particle anti-abrasion ultrahigh-toughness concrete and a preparation method thereof.
Background
The topography of mountainous areas in the west of China is complex, multiple deep grooves and gorges are formed, the number of bridges is large, natural disasters such as debris flow and flood are frequently generated in the mountainous areas, the flow rate of solid debris such as silt and stones is high, the flow is large, the destructive power is strong, hydraulic buildings such as piers are in service for one to two years under the coupling action of the debris flow, the debris flow and the dynamic load, the problems of concrete abrasion falling and cracks of a reinforcing steel bar protective layer generally occur, and huge potential safety hazards and high maintenance cost are caused. The conventional hydraulic construction and repair reinforcing material has low strength, poor impact toughness and abrasion resistance, and can not meet the actual requirements of engineering in complex environments in western mountainous areas.
The ultra-high performance concrete has excellent mechanical property and impact/abrasion resistance, is an ideal material for constructing and repairing hydraulic buildings such as piers and the like, and still has the following technical problems: 1) in the preparation process of the ultra-high performance concrete, the gel material has high dosage and large early shrinkage, and the volume stability of a concrete structure is seriously influenced; 2) the water-adhesive ratio is low, and the using amount of ultrafine particles is high, so that the defects of high viscosity and high slump loss are shown, and the pouring construction is not facilitated; 3) the interface bonding capability between the new and old concrete is poor; the application of the composite material in the fields of construction and repair reinforcement of hydraulic buildings such as piers and the like is limited by various defects.
Therefore, it is urgently needed to provide an anti-abrasion and anti-abrasion ultrahigh-performance concrete, which has the advantages of low shrinkage, good impact toughness, good abrasion resistance, high bonding strength of the interface between new and old concrete, and the like, and simultaneously has good working performance and volume stability, so that the concrete can be better used in the fields of hydraulic building construction, repair and reinforcement of piers and the like in complex environments in western mountainous areas.
Disclosure of Invention
The invention mainly aims to provide the modified rubber particle anti-abrasion ultra-high-toughness concrete aiming at the defects in the prior art, which has good working performance, low shrinkage, good anti-impact toughness and abrasion resistance, and high interface bonding strength of new and old concrete; the related preparation method is simple, has low cost and has important practical popularization value.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the modified rubber particle anti-abrasion ultra-high toughness concrete comprises the following components in percentage by weight: 700-800 kg/m cement3150-200 kg/m of fly ash micro-beads3150-200 kg/m silica fume3900-1080 kg/m of machine-made sand323-50 kg/m of modified rubber particles3160-200 kg/m of hybrid fiber334-38 kg/m of water reducing agent35-58 kg/m of interfacial reinforcing agent346-69 kg/m of composite expanding agent3207-220 kg/m of water3(ii) a The hybrid fiber is formed by mixing copper-plated straight steel fiber, multi-anchor steel fiber and PVA fiber.
According to the scheme, the interface reinforcing agent is dispersible rubber powder or water-based epoxy resin.
Preferably, the dosage of the dispersible rubber powder is 5-20 kg/m3The amount of the water-based epoxy resin is 11.5-57.5 kg/m3。
According to the scheme, the dispersible rubber powder is an ethylene-vinyl acetate copolymer, the particle size of the ethylene-vinyl acetate copolymer is 70-90 mu m, the solid content is more than or equal to 95%, and the apparent density is 400-600 g/L; the waterborne epoxy resin is an anionic waterborne epoxy resin.
According to the scheme, the mass ratio of the copper-plated flat steel fibers, the multi-anchor point steel fibers and the PVA fibers is (6-8) to (1-2); the multi-anchor steel fibers and the PVA fibers respectively account for 10-20% of the total mass of the hybrid fibers; the multi-anchor steel fibers and the PVA fibers account for 10-20% of the total mass of the hybrid fibers, and the balance is the copper-plated flat steel fibers.
According to the scheme, the nominal length of the copper-plated flat steel fiber is 10-16 mm, the equivalent diameter is 0.18-0.35 mm, the breaking strength is greater than or equal to 2000MPa, and the elastic modulus is 200-220 GPa; the nominal length of the multi-anchor-point steel fiber is 23-29 mm, the equivalent diameter is 0.45-0.55 mm, the breaking strength is more than or equal to 1000MPa, and the elastic modulus is 210-230 GPa; the PVA fiber has the nominal length of 10-12 mm, the equivalent diameter of 0.18-0.20 mm, the breaking strength of more than or equal to 950MPa, the elastic modulus of more than or equal to 15GPa, the breaking elongation of 10-15 percent and no water absorption.
According to the scheme, the modified rubber particles are obtained by soaking waste rubber particles in NaOH solution for 20-50 min, and the apparent density of the modified rubber particles is 1000-1200 kg/m3And is 1-3 mm continuous gradation.
Preferably, the modified rubber particles are obtained by sequentially soaking in NaOH solution (20-50 min) and kh570 ethanol solution (20-40 min).
According to the scheme, the concentration of the NaOH solution is 5-20 wt%; the concentration of kh570 in the kh570 ethanol solution is 1-5 wt%.
According to the scheme, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the solid content of the water reducing agent is more than or equal to 20%, and the water reducing rate is more than or equal to 20%.
According to the scheme, the preparation method of the composite expanding agent comprises the following steps:
1) compounding limestone and bauxite according to the mass ratio of (1-1.5) to 1, placing the mixture into a high-temperature furnace, controlling the calcining temperature to be 1350-1500 ℃, and keeping the temperature for 30-50 min; then mixing and grinding the mixture obtained by calcination and anhydrite according to the mass ratio of (2.5-3) to 1 until the specific surface area is more than or equal to 300m2Per kg, preparing HCSA type expanding agent;
2) putting magnesite into a high-temperature furnace, controlling the calcining temperature to be 1000-1100 ℃, keeping the temperature for 25-30 min, grinding the calcined product, sieving the ground product with a 200-mesh square-hole sieve, and controlling the particle size to be 45-75 mu m to prepare an MgO type expanding agent;
3) compounding the HCSA type expanding agent prepared in the step 1) with the MgO type expanding agent prepared in the step 2) and anhydrite according to the mass ratio of (6-7) to (2-3) to (1-2) to prepare the composite expanding agent.
According to the scheme, the parent rock strength of the machine-made sand is not less than 100MPa, the continuous gradation is 1-4.75 mm, and the apparent density is 2650-2980 kg/m35-8% of stone powder, less than 0.5% of mud, 20-25% of crushing value and less than 1.40% of MB value.
According to the scheme, the cement is P.O 42.5 or P.O 52.5 portland cement.
According to the scheme, the specific surface area of the fly ash micro-beads is more than or equal to 1300m2The activity index of the catalyst per kg, 28d is more than or equal to 90 percent, the ignition loss is less than or equal to 5.0 percent, and the water demand ratio is less than or equal to 90 percent.
According to the scheme, SiO in the silica fume2The mass content is more than or equal to 90 percent, and the specific surface area is more than or equal to 19500m2The activity index of/kg, 28d is more than or equal to 105 percent.
According to the scheme, the water is ordinary tap water and meets the requirements of concrete water standard (JGJ 63-2006).
The preparation method of the modified rubber particle anti-abrasion ultra-high-toughness concrete comprises the following steps:
1) weighing the raw materials according to the proportion, wherein the components and the content thereof comprise: 700-800 kg/m cement3150-200 kg/m of fly ash micro-beads3150-200 kg/m silica fume3900-1080 kg/m of machine-made sand323-50 kg/m of modified rubber particles3160-200 kg/m of hybrid fiber334.5-37.95 kg/m of water reducing agent35-58 kg/m of interfacial reinforcing agent346-69 kg/m of composite expanding agent3207-220 kg/m of water3；
2) Adding the machine-made sand, the cement, the silica fume and the fly ash microbeads into a concrete mixer for uniformly pre-mixing; pouring the modified rubber particles and stirring uniformly; pouring water and a water reducing agent, uniformly stirring, adding a composite expanding agent, and uniformly stirring to obtain a mixture; uniformly adding the hybrid fibers after the mixture is changed into a viscous flow state, uniformly stirring, adding the interface reinforcing agent, and uniformly stirring; and finally, after the mould is filled, vibrated and formed, the surface of the modified rubber particle is covered with a waterproof film for film maintenance, and then the mould is removed for standard maintenance or steam maintenance, so that the modified rubber particle anti-abrasion ultrahigh-toughness concrete is obtained.
The modified rubber particle anti-impact-abrasion ultrahigh-toughness concrete obtained by the invention has the compressive strength of not less than 120MPa at 28d and the flexural strength of not less than 25MPa at 28d under standard curing, the interface bonding strength with C40 concrete of not less than 3MPa, the shrinkage of 56d of not more than 350 multiplied by 10-628d of impact and abrasion resistance strength of more than or equal to 160 h/(kg/m)2) (DLT 5150-2001 Underwater Steel ball method of Hydraulic concrete test rules); the concrete has the advantages of effectively improving the impact toughness, the abrasion resistance and the interface bonding strength of new and old concrete, having good working performance, mechanical property and volume stability, realizing the effective utilization of waste and old tires, and having important research and application values.
The invention adopts the following principle:
1) the invention adopts the waste tire crushed rubber particles as the aggregate to prepare the ultra-high performance concrete, which has low elastic modulus, is a good energy absorption material, has good energy absorption effect, abrasion resistance and impact resistance, NaOH is modified to dissolve hydrophobic impurities such as zinc stearate and the like on the surface of the rubber particles, the surface hydrophilicity of the rubber particles is improved, and the interface bonding strength between the rubber particles and a cement matrix is improved; in addition, the adopted kh570 is a silane coupling agent with hydrophilic and lipophilic groups, and hydrophilic cement paste and lipophilic rubber particles are connected together through the two groups, so that the interfacial bonding strength between the rubber particles and a cement matrix can be further improved, and the impact toughness and the abrasion resistance of concrete can be improved.
2) The main components of the composite expanding agent adopted by the invention are HCSA type expanding agent (anhydrous calcium sulphoaluminate, calcium oxide and anhydrite), magnesium oxide type expanding agent and anhydrite, the expansion efficiency of the HCSA type expanding agent and the anhydrite is mainly exerted in the early stage (before 7 d), and the early stage shrinkage of concrete can be compensated; the magnesium oxide type expanding agent has the characteristic of delayed expansion, and the expansion efficiency of the expanding agent is mainly exerted after 7 days, so that the later contraction of concrete can be compensated.
3) The invention adds the mixed fiber (copper-plated straight steel fiber, multi-anchor steel fiber and PVA fiber) into the ultra-high performance concrete; the steel fiber with high breaking strength and high elastic modulus can effectively improve the impact toughness and the abrasion resistance of the concrete; the multi-anchor steel fiber is provided with a plurality of anchor points, and when the concrete is influenced by external force, the fiber is not easy to straighten, loosen or pull out from the concrete; the PVA fiber is introduced into the concrete to greatly enhance the toughness of the concrete, the function of the PVA fiber on the matrix is mainly embodied in the restraint of the expansion crack of the surface layer of the test piece when the PVA fiber is damaged by compression, and the matrix interface is mainly combined by chemical cohesive force and mechanical anchoring force in a tensile state; according to the invention, PVA fibers and steel fibers (copper-plated flat steel fibers and multi-anchor steel fibers) are mixed, when micro cracks appear in the internal structure of the concrete, substrates on two opposite sides of the cracks are withdrawn from bearing load, and the steel fibers and the PVA fibers traversing the cracks bear load together; when the steel fibers and the PVA fibers are mixed and doped into the matrix, the fibers are twisted together in the forming process to form a three-dimensional network supporting structure system, so that the shrinkage of the matrix, the initial internal defects before the matrix is loaded and the internal additional tensile stress are reduced; in addition, because the adhesive force between the steel fiber and the matrix is large, the sliding of the steel fiber can play a certain buffer role in crack propagation; the measures are combined to remarkably improve the mechanical property and the abrasion/impact resistance of the obtained concrete.
4) The interface bonding strength modification mechanism is as follows:
the dispersible rubber powder is added into the concrete, a plurality of cavities are generated inside the concrete during the cement hardening process, moisture is easily gathered inside the cavities, and the cavities form weak parts of a cement matrix along with the curing and drying of the cement; after the redispersible rubber powder is added, the self-lubricating effect ensures that the latex powder can be automatically redispersed in the whole gelled slurry, and the redispersibility is good in water so that the latex powder can be rapidly dispersed to form emulsion which is filled in a cavity originally occupied by water; with the progress of the drying process, the emulsion is dehydrated again to form a polymer film which is continuously distributed around the cavity generated during the cement solidification, and the continuous polymer films attached to the hole walls can enhance the interface bonding strength between the machine-made sand and the slurry of the rubber particles and the cementing material, so that the concrete pores are reduced, and the interface bonding strength between new and old concrete is enhanced; the stress from the outside can be effectively absorbed, and the compression resistance, bending resistance, tensile strength and impact resistance toughness of the concrete are improved;
according to the invention, the water-based epoxy resin is doped in the concrete, and the molecular structure of the water-based epoxy resin contains two polar groups of hydroxyl and ether bond, so that the molecules of the water-based epoxy resin are easy to generate electromagnetic or chemical attraction with the adjacent surfaces, and the epoxy group of the water-based epoxy resin reacts with calcium ions of cement concrete to form a tightly cross-linked network complex polymer, thereby enhancing the interface bonding strength between the machine-made sand and the cement slurry and between the rubber particles and the cementing material slurry, reducing the concrete pores, enabling the structure to be more compact, and enhancing the anti-impact and abrasion performance of the concrete and the interface bonding strength between new and old concrete.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention adopts the energy-absorbing material with low elastic modulus, namely the broken rubber particles of the waste tires as the aggregate to replace the machine-made sand to prepare the ultra-high performance concrete, and has good energy-absorbing effect, abrasion resistance and impact resistance; NaOH is modified to dissolve hydrophobic impurities such as zinc stearate on the surface of the rubber particles, the hydrophilic property of the surface of the rubber particles is improved, and the bonding strength of the interface between the rubber particles and a cement matrix is improved.
2) According to the invention, the hybrid fibers are doped in the concrete, and based on different action mechanisms of different fibers on micromechanics, the hybrid fibers are distributed in a disorderly manner in the concrete matrix to form a three-dimensional network structure, so that the microstructure of the concrete is improved, the development of cracks and defects is controlled, and the mechanical property, the impact toughness and the abrasion resistance of the concrete can be greatly improved.
3) According to the invention, the waterborne epoxy resin polymer or the modified rubber powder is added into the concrete, so that the interface bonding strength between the aggregate and the gelled material slurry is enhanced, the concrete pores are reduced, the structure is more compact, the working performance of the obtained concrete is effectively improved by the cooperation of the waterborne epoxy resin polymer or the modified rubber powder and other components, and the interface bonding strength between new and old concrete is obviously improved.
4) The modified rubber particles obtained by the invention have the advantages that the 28d compressive strength is more than or equal to 120MPa, the 28d flexural strength is more than or equal to 25MPa, the interface bonding strength with C40 concrete is more than or equal to 3MPa, and the 56d shrinkage is less than or equal to 350 multiplied by 10 under the standard maintenance of the anti-abrasion ultrahigh-performance concrete-628d of impact and abrasion resistance strength of more than or equal to 150 h/(kg/m)2) (DLT 5150-2001 Underwater Steel ball method of Hydraulic concrete test rules). The concrete has the advantages of effectively improving the impact toughness, the abrasion resistance and the interface bonding strength of new and old concrete, having good working performance, mechanical property and volume stability, realizing the effective utilization of waste and old tires and having practical application value.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following examples, the cement used herein was Waxin P.O 52.5; the silica fume is provided by Shanghai sky happy silica powder materials, Inc., SiO295 percent of mass content and 19500m of specific surface area2Kg, 28d activity index 105%; the fly ash micro-beads are provided by Kyochengjiade (Beijing) commercial Co., Ltd, and the specific surface area of the fly ash micro-beads is 1300m2The activity index of 28 days is 101 percent, the water demand ratio is 88 percent, and the sphere density is 2.32g/cm3Thixotropic index 7.5; the machine-made sand is pebble crusher-made sand, and is 1-4.75 mm in continuous gradation and 2650kg/m in apparent density3Fineness modulus 3.0, stone powder content 5%, MB value 1.0; the rubber particles are broken rubber particles of waste tires produced by Huayi rubber Co., Ltd, City, Yangtze river weir, the particle size is 1-3 mm, and the apparent density is 1120kg/m3(ii) a The hybrid fiber is formed by mixing copper-plated flat steel fiber, multi-anchor steel fiber and PVA fiber according to the mass ratio of 8:1:1, wherein the copper-plated flat steel fiber and the multi-anchor steel fiber are produced by New engineering materials science and technology Limited in Wuhan New-technology, the nominal length of the copper-plated flat steel fiber is 13mm, the equivalent diameter is 0.25mm, the breaking strength is 3500MPa, the elastic modulus is 210GPa, the nominal length of the multi-anchor steel fiber is 26mm, the equivalent diameter is 0.5mm, the breaking strength is 1000MPa, and the elastic modulus is 220 GPa; the PVA fiber is produced by Jiangsu Subo new material GmbH, the nominal length is 12mm, the equivalent diameter is 200 μm, the elastic modulus is 15GPa, the elongation at break is 10-15%, the breaking strength is more than 950MPa, and the PVA fiber has no water absorption; the dispersible rubber powder is produced by gallery republic of Langmuir rubber industry, the particle size is 80 mu m, the solid content is 98 percent, and the apparent density is 500 g/L; the waterborne epoxy resin is E51 type waterborne epoxy resin produced by Shenzhen Jitian chemical industry Limited; the adopted water reducing agent is a polycarboxylic acid high-efficiency water reducing agent produced by Jiangsu Subot, the solid content is 28 percent, and the water reducing rate is 28 percent; the water is ordinary tap water.
In the following examples, the preparation method of the composite expanding agent comprises the following steps:
1) compounding limestone and bauxite in the mass ratio of 1 to 1, placing the mixture into a high-temperature furnace, controlling the calcining temperature to 1350 ℃, keeping the temperature for 40min, mixing the calcined limestone and bauxite with anhydrite in the mass ratio of 2.5 to 1, and grinding the mixture until the specific surface area is equal to300m2Per kg, preparing HCSA type expanding agent;
2) putting magnesite into a high-temperature furnace, controlling the calcining temperature to be 1000 ℃, keeping the temperature for 30min, grinding the calcined product, sieving the ground product by a 200-mesh square-hole sieve, and controlling the granularity to be 45-75 mu m to prepare an MgO type expanding agent;
3) compounding the HCSA type expanding agent, the MgO type expanding agent and the anhydrite prepared in the steps 1) and 2) according to the mass ratio of 6.8:2.2:1 to prepare the composite expanding agent.
The method for preparing the modified rubber particles described in examples 1 to 5 includes the steps of:
1) cleaning the rubber particles with water, naturally airing, placing in a clean container, pouring a NaOH solution with the mass fraction of 5% until the surfaces of the rubber particles are just soaked, soaking for 25 minutes, washing with clear water until the PH is neutral, and airing for later use.
2) Preparation of kh570 modified rubber particles: cleaning rubber particles with water, naturally drying, placing in a clean container, pouring 1% kh570-C2H5And (3) soaking the OH solution on the surface of the rubber particle for 20 minutes, cleaning with clear water, and airing to obtain the modified rubber particle.
The method for producing the modified rubber particles described in examples 6 to 10 includes the steps of:
1) firstly, cleaning rubber particles with water, naturally airing the rubber particles, putting the rubber particles into a clean container, pouring a NaOH solution with the mass fraction of 5% until the surfaces of the rubber particles are just soaked, soaking the rubber particles for 30 minutes, washing the rubber particles with clear water until the PH value is neutral, and airing the rubber particles to obtain the modified rubber particles.
Examples 1 to 5
The modified rubber particle anti-abrasion ultra-high-toughness concrete disclosed in the embodiment 1-5 takes dispersible rubber powder as an interface reinforcing agent, and the preparation method comprises the following steps:
1) weighing the raw materials according to the proportion in table 1;
2) adding the weighed machine-made sand, cement, silica fume and fly ash microbeads into a concrete mixer for premixing for 3min, pouring rubber particles and stirring for 2min, pouring water and a water reducing agent and stirring for 4min, then adding a composite expanding agent and stirring for 2min, uniformly adding the hybrid fibers and continuously stirring for 3 min; adding dispersible rubber powder, stirring for 1min, finally, filling a mold, vibrating, forming, covering a watertight film on the surface, removing the mold after 1d, and carrying out standard maintenance to obtain the modified rubber particle anti-impact grinding ultra-high toughness concrete.
The modified rubber particle impact-resistant and abrasion-resistant ultra-high-toughness concrete obtained in examples 1 to 5 is compared with a comparative example (D1) without dispersible rubber powder, and specific performance test results are shown in Table 2.
TABLE 1 blending ratio (kg/m) of modified rubber particles to impact-resistant and abrasion-resistant ultra-high toughness concrete in examples 1 to 53)
Figure BDA0002225211910000061
Table 2 results of testing properties of modified rubber particles obtained in examples 1 to 5 on abrasion-resistant ultra-high toughness concrete
Figure BDA0002225211910000071
The results show that the modified rubber particles have the compression strength grade of over 130MPa, and have the advantages of good working performance (slump/expansion), volume stability (low shrinkage rate of 56 d), good abrasion/impact resistance, high interface bonding strength of new and old concrete and the like.
Examples 6 to 10
The modified rubber particle anti-abrasion ultrahigh-performance concrete disclosed by embodiment 6-10 takes the waterborne epoxy resin as an interface reinforcing agent, and the preparation method comprises the following steps:
1) weighing the raw materials according to the proportioning conditions in table 3;
2) adding the machine-made sand, the cement, the silica fume and the fly ash microbeads into a concrete mixer for premixing for 3min, pouring the rubber particles for stirring for 2min, pouring the water and the water reducing agent for stirring for 4min, then adding the composite expanding agent for stirring for 2min, uniformly adding the hybrid fibers, and continuing to stir for 3 min; adding water-based epoxy resin, stirring for 3min, finally, filling a mold, vibrating, forming, covering a watertight film on the surface, removing the mold after 1d, and carrying out standard maintenance to obtain the modified rubber particle anti-abrasion ultrahigh-performance concrete.
The modified rubber particle anti-abrasion ultrahigh-performance concrete obtained in examples 6-10 is compared with a comparative example (D2) without adding waterborne epoxy resin, and specific performance test results are shown in Table 4.
Table 3 mixing ratio (kg/m) of modified rubber particles to impact-resistant and abrasion-resistant ultra-high performance concrete in examples 6 to 103)
Figure BDA0002225211910000072
Table 4 results of testing properties of modified rubber particles obtained in examples 6 to 10 on abrasion-resistant ultrahigh-performance concrete
Figure BDA0002225211910000081
The results show that the modified rubber particle anti-abrasion ultra-high performance concrete obtained by the invention has the compression strength grade of more than 120MPa, and has the advantages of good working performance (slump/expansion), volume stability (low shrinkage rate of 56 d), good anti-abrasion/impact performance, high interface bonding strength of new and old concrete and the like.
The modified rubber particle anti-abrasion ultrahigh-performance concrete prepared by the invention can be widely applied to the fields of construction and repair reinforcement of hydraulic buildings such as bridge piers and the like, the bearing capacity and service life of the hydraulic buildings such as the bridge piers and the like are improved, the maintenance cost is reduced, meanwhile, the effective utilization of wastes is realized, the problem of shortage of quartz sand and river sand resources in China is solved, the limitation of regional resources on the development of the ultrahigh-performance concrete is removed, and the concrete has important economic and environmental benefits.
The above embodiments are merely examples for clearly illustrating the present invention and do not limit the present invention. Other variants and modifications of the invention, which are obvious to those skilled in the art and can be made on the basis of the above description, are not necessary or exhaustive for all embodiments, and are therefore within the scope of the invention.

Claims (10)

1. The modified rubber particle anti-abrasion ultra-high toughness concrete is characterized by comprising the following components in percentage by weight: 700-800 kg/m cement3150-200 kg/m of fly ash micro-beads3150-200 kg/m silica fume3900-1080 kg/m of machine-made sand323-50 kg/m of modified rubber particles3160-200 kg/m of hybrid fiber334-38 kg/m of water reducing agent35-58 kg/m of interfacial reinforcing agent346-69 kg/m of composite expanding agent3207-220 kg/m of water3(ii) a The hybrid fiber is formed by mixing copper-plated straight steel fiber, multi-anchor steel fiber and PVA fiber.
2. The modified rubber particle impact-resistant and abrasion-resistant ultrahigh-toughness concrete as claimed in claim 1, wherein the interface reinforcing agent is dispersible rubber powder or water-based epoxy resin.
3. The modified rubber particle anti-abrasion ultra-high toughness concrete as claimed in claim 2, wherein the amount of the dispersible rubber powder is 5-15 kg/m3The amount of the water-based epoxy resin is 11.5-57.5 kg/m3。
4. The modified rubber particle impact-resistant grinding-resistant ultra-high-toughness concrete as claimed in claim 2, wherein the dispersible rubber powder is an ethylene-vinyl acetate copolymer, the particle size of the ethylene-vinyl acetate copolymer is 70-90 μm, the solid content of the ethylene-vinyl acetate copolymer is greater than or equal to 95%, and the apparent density of the ethylene-vinyl acetate copolymer is 400-600 g/L; the waterborne epoxy resin is anionic waterborne epoxy resin.
5. The modified rubber particle anti-abrasion ultra-high toughness concrete as claimed in claim 1, wherein the mass ratio of the copper plated straight steel fiber, the multi-anchor point steel fiber and the PVA fiber is (6-8): (1-2): 1-2); the multi-anchor steel fibers and the PVA fibers respectively account for 10-20% of the total mass of the hybrid fibers.
6. The modified rubber particle impact-resistant and wear-resistant ultrahigh-toughness concrete as claimed in claim 1, wherein the copper-plated flat steel fibers have a nominal length of 10-16 mm, an equivalent diameter of 0.18-0.35 mm, a breaking strength of not less than 2000MPa, and an elastic modulus of 200-220 GPa; the nominal length of the multi-anchor-point steel fiber is 23-29 mm, the equivalent diameter is 0.45-0.55 mm, the breaking strength is more than or equal to 1000MPa, and the elastic modulus is 210-230 GPa; the PVA fiber has the nominal length of 10-12 mm, the equivalent diameter of 0.18-0.20 mm, the breaking strength of more than or equal to 950MPa, the elastic modulus of more than or equal to 15GPa, the breaking elongation of 10-15 percent and no water absorption.
7. The modified rubber particle anti-abrasion ultra-high toughness concrete according to claim 1, wherein the modified rubber particles are obtained by soaking waste rubber particles in NaOH solution, and the apparent density of the modified rubber particles is 1000-1200 kg/m3And is 1-3 mm continuous gradation.
8. The modified rubber particle impact-resistant and wear-resistant ultrahigh-toughness concrete as claimed in claim 1, wherein the preparation method of the composite expanding agent comprises the following steps:
1) compounding limestone and bauxite according to the mass ratio of (1-1.5) to 1, placing the mixture into a high-temperature furnace, controlling the calcining temperature to be 1350-1500 ℃, and keeping the temperature for 30-50 min; then mixing and grinding the mixture obtained by calcination and anhydrite according to the mass ratio of (2.5-3) to 1 until the specific surface area is more than or equal to 300m2Per kg, preparing HCSA type expanding agent;
2) putting magnesite into a high-temperature furnace, controlling the calcining temperature to be 1000-1100 ℃, keeping the temperature for 25-30 min, grinding the calcined product, sieving the ground product with a 200-mesh square-hole sieve, and controlling the particle size to be 45-75 mu m to prepare an MgO type expanding agent;
3) compounding the HCSA type expanding agent prepared in the step 1) with the MgO type expanding agent prepared in the step 2) and anhydrite according to the mass ratio of (6-7) to (2-3) to (1-2) to prepare the composite expanding agent.
9. The modified rubber particle impact-resistant and wear-resistant ultrahigh-toughness concrete as claimed in claim 1, wherein the mother rock strength of the machine-made sand is not less than 100MPa, the continuous gradation is 1-4.75 mm, and the apparent density is 2650-2980 kg/m35-8 wt% of stone powder, less than 0.5% of mud, 20-25% of crushing value and less than 1.40% of MB value.
10. The preparation method of the modified rubber particle impact-resistant and wear-resistant ultra-high-toughness concrete as claimed in any one of claims 1 to 9, characterized by comprising the following steps:
1) weighing the raw materials according to the proportion, wherein the components and the content thereof comprise: 700-800 kg/m cement3150-200 kg/m of fly ash micro-beads3150-200 kg/m silica fume3900-1080 kg/m of machine-made sand323-50 kg/m of modified rubber particles3160-200 kg/m of hybrid fiber334.5-37.95 kg/m of water reducing agent35-58 kg/m of interfacial reinforcing agent346-69 kg/m of composite expanding agent3207-220 kg/m of water3；
2) Adding the machine-made sand, the cement, the silica fume and the fly ash microbeads into a concrete mixer for uniformly pre-mixing; pouring the modified rubber particles and stirring uniformly; pouring water and a water reducing agent, uniformly stirring, adding a composite expanding agent, and uniformly stirring to obtain a mixture; uniformly adding the hybrid fibers after the mixture is changed into a viscous flow state, uniformly stirring, adding the interface reinforcing agent, and uniformly stirring; and finally, after the mould is filled, vibrated and formed, the surface of the modified rubber particle is covered with a waterproof film for film maintenance, and then the mould is removed for standard maintenance or steam maintenance, so that the modified rubber particle anti-abrasion ultrahigh-toughness concrete is obtained.
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CN114195443A (en) * 2021-10-30 2022-03-18 深圳市振惠建混凝土有限公司 Light recycled concrete and preparation method thereof
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