CN111170697A - Modified rubber particle light-weight ultrahigh-performance concrete and preparation method thereof - Google Patents
Modified rubber particle light-weight ultrahigh-performance concrete and preparation method thereof Download PDFInfo
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- CN111170697A CN111170697A CN202010066119.4A CN202010066119A CN111170697A CN 111170697 A CN111170697 A CN 111170697A CN 202010066119 A CN202010066119 A CN 202010066119A CN 111170697 A CN111170697 A CN 111170697A
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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
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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
- C04B2111/40—Porous or lightweight materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a modified rubber particle light weight ultra-high performance concrete and a preparation method thereof, which is prepared by taking cement, fly ash micro-beads, silica fume, ceramic sand, rubber particles, copper-plated steel fibers, water-based epoxy resin, a water retention and shrinkage reduction internal curing agent, a water reducing agent and water as main raw materials, wherein the rubber particles are prepared by crushing waste tires and then modifying the crushed waste tires. The modified rubber particle light weight ultra-high performance concrete has the advantages of light weight, high strength, high impact toughness, abrasion resistance and good volume stability, and has practical application value.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to modified rubber particle light-weight ultrahigh-performance concrete and a preparation method thereof.
Background
In recent years, with the rapid development of national economy, the increase of urban population and the continuous expansion of urban construction scale, the problem of urban traffic congestion becomes more and more serious. The construction of urban viaducts and overpasses is an effective measure for solving urban traffic jam. At present, in the construction of viaducts and overpasses in China, most of the traditional concrete cast-in-place construction methods are adopted, the construction period is long (3-5 years), the environmental pollution is large, the occupied area is encircled, and the phenomena of traffic jam are very serious. The traditional bridge construction method is changed, and the development trend of urban bridge construction technology is to adopt a prefabricated assembly rapid construction method. Because the common high-performance concrete adopted at present has high density and low strength, and the size and the weight of the bridge prefabricated part are large, the transportation and hoisting construction of the bridge prefabricated part are difficult, and the development and the application of the prefabricated assembling construction technology are limited. The modified rubber particle light weight ultra-high performance concrete material with light weight, high strength, high impact toughness and good volume stability is developed, the ultra-high performance concrete prefabricated assembled bridge is prepared by adopting a steam curing-free process, the dead weight of the bridge structure is further reduced, the span of the bridge is increased, the rapid construction of the prefabricated assembled bridge can be carried out by adopting conventional transportation and hoisting construction equipment, and the construction requirements of urban viaducts and overpasses are met.
Disclosure of Invention
The invention aims to solve the technical problem of providing the modified rubber particle light-weight ultrahigh-performance concrete and the preparation method thereof aiming at the defects in the prior art, wherein the concrete is light in weight, good in working performance, high in strength, low in shrinkage, good in impact toughness and good in abrasion resistance.
In order to achieve the purpose, the invention adopts the technical scheme that: the modified rubber particle light weight ultra-high performance concrete comprises the following components in percentage by weight: 640-750 kg/m cement3130-180 kg of fly ash microbeadm3130-180 kg/m of silica fume3And 600-700 kg/m of ceramic sand323 to 35kg/m of rubber particles3150-200 kg/m copper-plated steel fiber320 to 30kg/m of water reducing agent310 to 20kg/m of water-based epoxy resin322-33 kg/m of water-retention shrinkage-reducing internal curing agent3170-190 kg/m of water3。
Preferably, the cement is P.O 42.5, P.O 52.5 or the like.
Preferably, the specific surface area of the fly ash micro-bead 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.
Preferably, 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.
Preferably, the ceramic sand is 1-5 mm continuous graded ceramic sand, the cylinder pressure strength is not less than 7.5MPa, and the bulk density is 550-670 kg/m3The apparent density is 1350-1500 kg/m3The saturated surface dry water absorption rate is 8.0-10.0%.
Preferably, the rubber particles are prepared by crushing waste tires and then modifying, the rubber particles are in 1-3 mm continuous gradation, and the apparent density is 1000-1200 kg/m3(ii) a The modification mode of the rubber particles is as follows: cleaning the rubber particles with water, naturally airing, placing in a clean container, pouring a NaOH solution with the mass fraction of 1% -5% until the surfaces of the rubber particles are just soaked, soaking for 60-90 minutes, washing with clear water until the pH value is neutral, and airing for later use to obtain the modified rubber particles.
Preferably, the nominal length of the copper-plated steel fiber is 10-16 mm, the equivalent diameter is 0.18-0.35 mm, the breaking strength is larger than or equal to 3000MPa, and the elastic modulus is 200-220 GPa.
Preferably, the aqueous epoxy resin is an anionic aqueous epoxy resin.
Preferably, the solid content of the water reducing agent is more than or equal to 30 percent, and the water reducing rate is more than or equal to 30 percent.
Preferably, the water retention and shrinkage reduction internal curing agent is prepared by the following steps:
1) mixing dipropylene glycol monobutyl ether and succinic anhydride according to the molar ratio of 1 (1.3-1.6), reacting at 120-150 ℃ for 200-280 min, and condensing to obtain a monomer L with a shrinkage reducing function;
2) mashing cassava, putting the mashed cassava into clear water, fully stirring and precipitating the mashed cassava, filtering cassava residues to obtain a suspension containing cassava starch, diluting the suspension with water, standing the suspension for 15-20 min, removing supernatant, and collecting precipitates to obtain the cassava starch;
3) adding 2.5-3 times of water by mass into the cassava starch obtained in the step 2), heating for 120-150 min under the water bath condition of 55-65 ℃, adding a sodium polyacrylate water-retaining agent and an N, N '-methylene bisacrylamide cross-linking agent, controlling the mass ratio of the cassava starch to the sodium polyacrylate water-retaining agent to the N, N' -methylene bisacrylamide cross-linking agent to be 1 (0.2-0.3) to (0.4-0.5), continuously stirring for 20-30 min, dropwise adding methyl methacrylate and the monomer L synthesized in the step 1 into the solution, controlling the mass ratio of the cassava starch to the methyl methacrylate to be 1 (0.04-0.06) to (0.3-0.4), and reacting at constant temperature for 25-30 min to obtain a crude product;
4) soaking the crude product obtained in the step 3) in acetone for 100-120 min, then performing extraction circulation in a Soxhlet extractor for 3-4 times for 20-26 h, washing, drying and grinding until the residue of a 60-micron square-hole sieve is less than or equal to 6% to obtain a water-retaining component M;
5) pre-calcining dolomite for 30-40 min at 1150-1250 ℃, then grinding, mixing the ground powder with ferrosilicon powder and fluorite powder, and controlling the components and the mass percentages of the components to be 70-80% of the powder, 15-20% of the ferrosilicon powder and 5-10% of the fluorite powder respectively; then reducing and calcining at 1180-1220 ℃ for 50-60 min under vacuum condition, cooling, mixing the obtained product with gypsum according to the mass ratio of 1 (15-20), and finally grinding until the specific surface area is 300-320 m2The screen residue of a square hole with 60 mu m is less than or equal to 6 percent to obtain an expansion component N, wherein CaO and SiO2、MgO、Al2O3And Fe2O3The mass percentages of the components are respectively 25-30%, 15-20%, 30-40%, 5-10% and 3-7%;
6) compounding the water-retention component M prepared in the step 4) with the expansion component N prepared in the step 5) according to the mass ratio of (2.5-3.5) to 1, then grinding for 10-15 min and sieving with a 200-mesh sieve to prepare the water-retention shrinkage-reducing internal curing agent.
A preparation method of modified rubber particle light weight ultrahigh performance concrete adopts the modified rubber particle light weight ultrahigh performance concrete, and comprises the following steps:
1) weighing the raw materials according to the proportion, wherein the components and the content thereof comprise: 640-750 kg/m cement3130-180 kg/m of fly ash micro-beads3130-180 kg/m of silica fume3And 600-700 kg/m of ceramic sand323 to 35kg/m of rubber particles3150-200 kg/m copper-plated steel fiber320 to 30kg/m of water reducing agent310 to 20kg/m of water-based epoxy resin322-33 kg/m of water-retention shrinkage-reducing internal curing agent3170-190 kg/m of water3；
2) Putting the ceramic sand into water to be soaked to a water-saturated state to obtain pre-wet ceramic sand, adding the pre-wet ceramic sand, cement, silica fume and rubber particles into a concrete mixer to be uniformly pre-mixed, adding fly ash microbeads and a water-retention shrinkage-reducing internal curing agent to be continuously and uniformly dry-mixed, then pouring water and a water reducing agent to be uniformly mixed, pouring water-based epoxy resin to be uniformly mixed, and uniformly adding copper-plated steel fibers to be uniformly mixed; and finally, after the steps of mold filling, vibrating and forming, covering a waterproof film on the surface, performing film curing, and then removing the mold for standard curing to obtain the modified rubber particle light-weight ultrahigh-performance concrete.
The invention adopts the following principle:
1) the invention adopts the broken rubber particles of waste tires as the aggregate to prepare the ultra-high performance concrete, on one hand, the low-density rubber particle aggregate can reduce the volume weight of the concrete and lead the concrete to be light; on the other hand, the rubber particles have low elastic modulus, are good energy-absorbing materials and have good impact performance with energy-absorbing effect, and NaOH modification can dissolve hydrophobic impurities such as zinc stearate and the like on the surfaces of the rubber particles, improve the surface hydrophilic performance of the rubber particles, slow down the inhibition effect of hydrophobic substances on the surfaces of the rubber particles on the hydration process of cement, and improve the mechanical property and impact toughness of concrete.
2) According to the invention, the ceramic sand is used as the aggregate to prepare the ultra-high performance concrete, so that on one hand, the apparent density of the concrete can be effectively reduced, and the self weight of a concrete structure is reduced; on the other hand, the surface of the ceramic sand is porous and rough, a large number of capillary pores are contained in the ceramic sand, the structure not only improves the bonding strength between the ceramic sand and cement mortar, but also the ceramic sand has a micro-pump effect, and the pre-wetted ceramic sand soaked by clear water can slowly release internal moisture along with the prolonging of time after the concrete is formed, so that the concrete is fully maintained, the self-shrinkage and drying shrinkage of the concrete are greatly reduced, and the compactness and strength of the concrete are improved; the use of the ceramic sand can effectively avoid the alkali aggregate reaction problem of the concrete, thereby prolonging the service life of the building and improving the durability of the ultra-high performance concrete. In addition, in the concrete preparation process, a layer of cement and silica fume is coated on the surface of the pre-wetted ceramic sand in advance, so that a high-strength and compact arch shell interface area can be formed at the joint of the ceramic sand and the gelled slurry, and the compressive stress of the ceramic sand is uniformly dispersed, so that the problem of low strength of the ceramic sand is effectively solved, harmful ions are prevented from migrating in the capillary pores of the hardened slurry, and the mechanical property of the lightweight ultrahigh-performance concrete is improved.
3) The water retention component in the water retention and shrinkage reduction internal curing agent is mainly an organic-inorganic high molecular compound, the compound has a three-dimensional strip network structure and an open pore structure, provides a large space for absorbing and storing water, and contains a large amount of hydroxyl groups capable of absorbing water molecules through the action of hydrogen bonds, so that the compound has high water absorption rate, can slowly release water in the hydration process of cement paste, and provides water guarantee for the late hydration of the cement paste and the late expansion of an expansion component in concrete; meanwhile, the shrinkage reducing group introduced on the main chain can reduce the surface tension of capillary pores in the concrete and reduce the compressive stress generated by water evaporation, thereby further reducing the drying shrinkage of the concrete; the expanding component in the water retention and shrinkage reduction internal curing agent is coated on C due to CaO and MgO in the early hydration process4AF mineral can not participate in reaction, and the swelling effect is inhibited; as hydration continues, C4The AF layer is destroyed, and CaO and MgO and free water are gradually releasedThe reaction takes place to form Ca (OH)2And Mg (OH)2The crystal generates volume expansion and plays a role in continuously compensating shrinkage of concrete under the continuous water release effect of the water retention component, and the water retention component and the expansion component in the water retention shrinkage-reducing internal curing agent play a role in internal curing shrinkage reduction together.
4) According to the invention, the water-based epoxy resin is doped into the concrete, the molecular structure of the water-based epoxy resin contains two polar groups of hydroxyl and ether bond, so that the water-based epoxy resin molecules are easy to generate electromagnetic or chemical attraction with adjacent surfaces, and the epoxy group of the water-based epoxy resin reacts with calcium ions of cement concrete and the like to form a tightly cross-linked reticular complex polymer, thereby enhancing the interface bonding strength between the ceramic sand and rubber particle aggregate, the steel fiber and the cementing material slurry, reducing the concrete pores, curing and filling the concrete pores in the concrete matrix by the epoxy resin, and improving the compactness of the concrete structure, thereby further improving the mechanical property and various properties of the concrete.
Compared with the prior art, the invention has the advantages and positive effects that:
(1) the invention adopts the energy-absorbing material with low elastic modulus, namely the broken rubber particles of the waste tires as part of the aggregate to prepare the ultra-high performance concrete, and has good energy-absorbing effect and impact resistance; the surface hydrophilic property of the rubber particles can be improved by NaOH modification, the interface bonding strength between the rubber particles and a cement matrix is improved, and the cement hydration process is promoted, so that the impact toughness of the concrete is improved.
(2) The pre-wet ceramic sand is used as aggregate to prepare the ultra-high performance concrete, so that the apparent density of the ultra-high performance concrete can be effectively reduced, the problem of large shrinkage of the existing ultra-high performance concrete can be solved by utilizing the internal curing effect of the pre-wet ceramic sand, and simultaneously, the slurry around the ceramic sand is promoted to form a high-strength and compact arch shell interface area by combining a pre-mixing process, so that the mechanical property and the durability of the light ultra-high performance concrete are improved; in addition, the problem that the conventional aggregate (such as quartz sand, river sand and the like) for the ultra-high performance concrete is deficient in resources can be effectively solved, the resource and energy are saved, the national sustainable development strategy is met, and the problem that the development of the ultra-high performance concrete is limited by regional resources is improved;
(3) according to the invention, the waterborne epoxy resin polymer is doped in the concrete, so that the interface bonding strength among the aggregate, the fiber and the gelled material slurry is enhanced, and the epoxy resin is cured in the concrete matrix to fill the concrete pores, so that the concrete pores are reduced, and the structural compactness is improved.
(4) The apparent density of the modified rubber particle light ultra-high performance concrete is 1950-2100 kg/m3Compared with the common ultrahigh-performance concrete, the self weight of the concrete is reduced by more than 19 percent, and the self weight of a concrete structure is reduced; meanwhile, the standard curing 28d compressive strength grade can reach more than C100, and the 56d drying shrinkage rate is less than 350 multiplied by 10-6The material has good working performance, mechanical property and volume stability; the 28d impact energy is more than or equal to 1200J (CECS 13: 2009 Standard of fiber concrete test method) by a drop hammer method, and the impact toughness of the concrete member can be effectively improved. And the effective utilization of waste and old tires is realized, and the method has 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 is Huaxin P.O 52.5; the silica fume is provided by Shanghai sky happy silica powder materials, Inc., SiO2The mass content is 95 percent, and the specific surface area is 19500m2/kg, 28d activity index 105%; the fly ash micro-bead is provided by Kyochengjiade (Beijing) commercial Co., Ltd, and the specific surface area of the fly ash micro-bead 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 of 7.5; the cylinder pressure strength is more than or equal to 7.5MPa, and the bulk density is 550-670 kg/m3The apparent density is 1350-1500 kg/m3The saturated surface dry water absorption rate is 9.0%; 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 New engineering of plated copper steel fiberThe material is produced by materials science and technology limited company, the nominal length is 13mm, the equivalent diameter is 0.25mm, the breaking strength is 3500MPa, and the elastic modulus is 210 GPa; the waterborne epoxy resin is produced by Shenzhen Jitian chemical industry Co.Ltd; the water is ordinary tap water.
The water reducing agent in the following examples has 30% of solid content and 30% of water reducing rate:
the preparation method of the water retention and shrinkage reduction internal curing agent in the following embodiment comprises the following steps:
1) mixing dipropylene glycol monobutyl ether and succinic anhydride according to a molar ratio of 1:1.5, reacting for 240min at 130 ℃, and condensing to obtain a monomer L with a shrinkage reducing function;
2) mashing cassava, placing the mashed cassava into clear water, fully stirring the mashed cassava and the clear water, precipitating the mashed cassava, filtering cassava residues to obtain a suspension containing cassava starch, adding a large amount of clear water into the suspension for dilution, standing the suspension for 15min, removing supernatant, and collecting precipitates to obtain the cassava starch;
3) adding 3 times of water by mass into the cassava starch obtained in the step 2), placing the cassava starch in a water bath kettle at 55 ℃, stirring and heating for 130min, adding a sodium polyacrylate water-retaining agent and an N, N '-methylene bisacrylamide cross-linking agent, controlling the mass ratio of the cassava starch to the sodium polyacrylate water-retaining agent to the N, N' -methylene bisacrylamide cross-linking agent to be 1:0.2:0.4, continuously stirring for 30min, dropwise adding methyl methacrylate and the monomer L synthesized in the step 1) into the solution, controlling the mass ratio of the cassava starch to the methyl methacrylate to be 1:0.05:0.3, and reacting at constant temperature for 30min to obtain a crude product;
4) soaking the crude product prepared in the step 3) in acetone for 2h, extracting and circulating for 4 times in a Soxhlet extractor for 24h, washing, drying, and grinding to obtain a water retention component M, wherein the residue on a 60-micron square hole sieve is less than or equal to 6%;
5) pre-calcining dolomite at 1250 ℃ for 30min, then grinding, mixing the obtained powder with ferrosilicon powder and fluorite powder, controlling the components and the mass percentages of the components to be 75 percent of the powder (the dolomite powder), 18 percent of the ferrosilicon powder and 7 percent of the fluorite powder respectively, then reducing and calcining for 1h at 1180 ℃ under the vacuum condition, cooling, mixing the obtained product with gypsum according to the mass ratio of 1:16, and finally grinding to a specific tableThe area of the sieve residue is 300-320 m2/kg and 60 mu m square hole sieve residue is less than or equal to 6 percent to obtain an expansion component N, wherein CaO and SiO2、MgO、Al2O3And Fe2O3The mass percentages of the components are respectively 29%, 19%, 37%, 8% and 5%;
mixing the water-retaining component M prepared in the step 4) with the expansion component N prepared in the step 5) according to the mass ratio of 3:1, then grinding for 15min, and sieving with a 200-mesh sieve to obtain the water-retaining shrinkage-reducing internal curing agent.
The method for modifying rubber particles described in the examples comprises the following steps: cleaning the rubber particles with water, naturally airing, placing in a clean container, pouring a NaOH solution with the mass fraction of 4% until the surfaces of the rubber particles are just soaked, soaking for 65 minutes, washing with clear water until the pH value is neutral, and airing to obtain the modified rubber particles.
Examples 1 to 5
The preparation method of the modified rubber particle light weight ultra-high performance concrete comprises the following steps:
1) weighing the raw materials according to the proportion in the table 1;
2) putting the ceramic sand into water to be soaked to a water-saturated state to obtain pre-wet ceramic sand, adding the pre-wet ceramic sand, cement, silica fume and rubber particles into a concrete mixer to be pre-stirred for 2min, adding fly ash microbeads and a water-retention shrinkage-reducing internal curing agent to be continuously dry-stirred for 1min, then pouring water and a water reducing agent to be stirred for 3min, pouring water-based epoxy resin to be stirred for 1min, and uniformly adding copper-plated steel fibers to be stirred for 3 min; and finally, after the steps of mold filling, vibrating and forming, covering a waterproof film on the surface, performing film curing, then removing the mold, and curing according to the standard curing regulation of concrete in GB/T50081-2019 'test method standard for physical and mechanical properties of concrete', thus obtaining the modified rubber particle light-weight ultrahigh-performance concrete. The results of the performance tests of the modified rubber particles of the lightweight ultrahigh performance concrete obtained in each example are shown in Table 2.
TABLE 1 blending ratio (kg/m) of modified rubber particles of lightweight ultra-high performance concrete described in examples 1 to 53)
Table 2 results of performance tests on modified rubber particle lightweight ultra-high performance concrete obtained in examples 1 to 5
The results show that the compressive strength grade of the modified rubber particle light ultra-high performance concrete can reach more than C100, and the volume weight is 1950-2100 kg/m3Compared with the common ultrahigh-performance concrete, the self weight of the concrete is reduced by more than 19 percent, so that the self weight of a concrete structure can be effectively reduced, the design difficulty of the concrete structure is reduced, and the bearing capacity of a building is improved; has the advantages of good working performance (slump/expansion), volume stability (low 56d shrinkage), good impact resistance and the like. The modified rubber particle light weight ultra-high performance concrete prepared by the invention can be widely applied to the construction, prefabrication, assembly and rapid construction of urban bridges, the bearing capacity and service life of bridge structures are improved, the maintenance cost is reduced, meanwhile, the effective utilization of wastes is realized, the problem of the shortage of quartz sand and river sand resources in China is solved, the limitation of the development of the ultra-high performance concrete to regional resources 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 light-weight ultrahigh-performance concrete is characterized by comprising the following components in percentage by weight: 640-750 kg/m cement3130-180 kg/m of fly ash micro-beads3130-180 kg/m of silica fume3And 600-700 kg/m of ceramic sand323 to 35kg/m of rubber particles3150-200 kg/m copper-plated steel fiber320 to 30kg/m of water reducing agent310 to 20kg/m of water-based epoxy resin322-33 kg/m of water-retention shrinkage-reducing internal curing agent3170-190 kg/m of water3。
2. The modified rubber particle lightweight ultra-high performance concrete according to claim 1, wherein the cement is P-O42.5 or P-O52.5.
3. The modified rubber particle lightweight ultra-high performance concrete as claimed in claim 1, wherein the specific surface area of the fly ash micro-beads is not less than 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.
4. The modified rubber particle lightweight ultra-high performance concrete of claim 1, wherein the SiO of 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.
5. The modified rubber particle lightweight ultrahigh-performance concrete as claimed in claim 1, wherein the ceramic sand is 1-5 mm continuous graded ceramic sand, the cylinder pressure strength is not less than 7.5MPa, and the bulk density is 550-670 kg/m3The apparent density is 1350-1500 kg/m3The saturated surface dry water absorption rate is 8.0-10.0%.
6. The modified rubber particle lightweight ultra-high performance concrete according to claim 1,
the rubber particles are prepared by crushing waste tires and then modifying the crushed waste tires, the rubber particles are 1-3 mm continuous gradation, and the apparent density is 1000-1200 kg/m3(ii) a The modification mode of the rubber particles is as follows: cleaning the rubber particles with water, naturally airing, placing in a clean container, pouring a NaOH solution with the mass fraction of 1% -5% until the surfaces of the rubber particles are just soaked, soaking for 60-90 minutes, washing with clear water until the pH value is neutral, and airing to obtain the modified rubber particles.
7. The modified rubber particle lightweight ultrahigh-performance concrete as claimed in claim 1, wherein the copper-plated steel fibers have a nominal length of 10 to 16mm, an equivalent diameter of 0.18 to 0.35mm, a breaking strength of not less than 3000MPa, and an elastic modulus of 200 to 220 GPa.
8. The modified rubber particle light weight ultra-high performance concrete of claim 1, characterized in that the water reducing agent has a solid content of not less than 30% and a water reducing rate of not less than 30%.
9. The modified rubber particle lightweight ultra-high performance concrete as claimed in claim 1, wherein the water retention shrinkage reducing internal curing agent is prepared by the following steps:
1) mixing dipropylene glycol monobutyl ether and succinic anhydride according to the molar ratio of 1 (1.3-1.6), reacting at 120-150 ℃ for 200-280 min, and condensing to obtain a monomer L with a shrinkage reducing function;
2) mashing cassava, putting the mashed cassava into clear water, fully stirring and precipitating the mashed cassava, filtering cassava residues to obtain a suspension containing cassava starch, diluting the suspension with water, standing the suspension for 15-20 min, removing supernatant, and collecting precipitates to obtain the cassava starch;
3) adding 2.5-3 times of water by mass into the cassava starch obtained in the step 2), heating for 120-150 min under the water bath condition of 55-65 ℃, adding a sodium polyacrylate water-retaining agent and an N, N '-methylene bisacrylamide cross-linking agent, controlling the mass ratio of the cassava starch to the sodium polyacrylate water-retaining agent to the N, N' -methylene bisacrylamide cross-linking agent to be 1 (0.2-0.3) to (0.4-0.5), continuously stirring for 20-30 min, dropwise adding methyl methacrylate and the monomer L synthesized in the step 1 into the solution, controlling the mass ratio of the cassava starch to the methyl methacrylate to be 1 (0.04-0.06) to (0.3-0.4), and reacting at constant temperature for 25-30 min to obtain a crude product;
4) soaking the crude product obtained in the step 3) in acetone for 100-120 min, then performing extraction circulation in a Soxhlet extractor for 3-4 times for 20-26 h, washing, drying and grinding until the residue of a 60-micron square-hole sieve is less than or equal to 6% to obtain a water-retaining component M;
5) pre-calcining dolomite for 30-40 min at 1150-1250 ℃, then grinding, mixing the ground powder with ferrosilicon powder and fluorite powder, and controlling the components and the mass percentages of the components to be 70-80% of the powder, 15-20% of the ferrosilicon powder and 5-10% of the fluorite powder respectively; then reducing and calcining at 1180-1220 ℃ for 50-60 min under vacuum condition, cooling, mixing the obtained product with gypsum according to the mass ratio of 1 (15-20), and finally grinding until the specific surface area is 300-320 m2The screen residue of a square hole with 60 mu m is less than or equal to 6 percent to obtain an expansion component N, wherein CaO and SiO2、MgO、Al2O3And Fe2O3The mass percentages of the components are respectively 25-30%, 15-20%, 30-40%, 5-10% and 3-7%;
6) compounding the water-retention component M prepared in the step 4) with the expansion component N prepared in the step 5) according to the mass ratio of (2.5-3.5) to 1, then grinding for 10-15 min and sieving with a 200-mesh sieve to prepare the water-retention shrinkage-reducing internal curing agent.
10. A method for preparing modified rubber particle lightweight ultra-high performance concrete, which adopts the modified rubber particle lightweight ultra-high performance concrete of any one of claims 1 to 9, and is characterized by comprising the following steps:
1) weighing the raw materials according to the proportion, wherein the components and the content thereof comprise: 640-750 kg/m cement3130-180 kg/m of fly ash micro-beads3130-180 kg/m of silica fume3And 600-700 kg/m of ceramic sand323 to 35kg/m of rubber particles3150-200 kg/m copper-plated steel fiber320 to 30kg/m of water reducing agent310 to 20kg/m of water-based epoxy resin322-33 kg/m of water-retention shrinkage-reducing internal curing agent3170-190 kg/m of water3；
2) Putting the ceramic sand into water to be soaked to a water-saturated state to obtain pre-wet ceramic sand, adding the pre-wet ceramic sand, cement, silica fume and rubber particles into a concrete mixer to be uniformly pre-mixed, adding fly ash microbeads and a water-retention shrinkage-reducing internal curing agent to be continuously and uniformly dry-mixed, then pouring water and a water reducing agent to be uniformly mixed, pouring water-based epoxy resin to be uniformly mixed, and uniformly adding copper-plated steel fibers to be uniformly mixed; and finally, after the steps of mold filling, vibrating and forming, covering a waterproof film on the surface, performing film curing, and then removing the mold for standard curing to obtain the modified rubber particle light-weight ultrahigh-performance concrete.
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| CN115417642B (en) * | 2022-09-21 | 2023-06-30 | 成都精准混凝土有限公司 | Low-carbon concrete and preparation method thereof |
| CN116496052A (en) * | 2023-06-30 | 2023-07-28 | 德州润德混凝土有限公司 | Preparation method of ultra-high performance concrete containing fine aggregate |
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