CN111039624A - Recycled concrete and preparation method thereof - Google Patents
Recycled concrete and preparation method thereof Download PDFInfo
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- CN111039624A CN111039624A CN201911363725.6A CN201911363725A CN111039624A CN 111039624 A CN111039624 A CN 111039624A CN 201911363725 A CN201911363725 A CN 201911363725A CN 111039624 A CN111039624 A CN 111039624A
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/022—Agglomerated materials, e.g. artificial aggregates agglomerated by an organic binder
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention relates to recycled concrete and a preparation method thereof, belonging to the technical field of concrete. The recycled concrete comprises, by weight, 150-280 parts of cement, 90-130 parts of water, 800-950 parts of modified recycled coarse aggregate, 400-530 parts of fine aggregate, 40-85 parts of fly ash, 80-100 parts of mineral powder, 50-140 parts of zeolite powder, 30-60 parts of epoxy resin, 4-10 parts of a water reducer and 2-6 parts of an air entraining agent; the preparation method of the modified recycled coarse aggregate comprises the following steps: s1: taking waste concrete, crushing and screening to obtain regenerated coarse aggregate; s2: soaking the recycled coarse aggregate in the step S1 in an acetic acid solution with the mass concentration of 2-7%, and then airing; s3: stirring 80-110 parts of polyvinyl alcohol, 60-110 parts of silica fume, 40-80 parts of sodium silicate and 1000 parts of 800-one water to obtain a modified solution; s4: and (4) soaking the recycled coarse aggregate obtained in the step (S2) in the modification solution obtained in the step (S3), taking out and baking to obtain the modified recycled coarse aggregate. The recycled concrete has the effect of better compressive strength.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to recycled concrete and a preparation method thereof.
Background
In recent years, with the rapid development of China, the construction industry is also rapidly developed, so that the consumption of concrete is increased year by year. The increasing demand for concrete requires the exploitation of a large amount of sandstone resources, resulting in a serious crisis of raw material resources in many regions. And except that a small part of the waste concrete in China is used as a foundation cushion of buildings and roads, most of the waste concrete is transported to suburbs and is treated in a stacking or landfill mode, so that not only is the land resource occupied, but also the land occupation and treatment cost amount per year are huge, and therefore, the recycled concrete is also more and more emphasized.
The regenerated concrete is prepared by crushing, cleaning and grading waste concrete blocks, mixing the crushed, cleaned and graded waste concrete blocks with a grading agent according to a certain proportion, partially or completely replacing natural aggregates (mainly coarse aggregates) such as sand stones and the like, and adding cement, water and the like. The recycled concrete can be combined into aggregates in the following cases: all aggregates are regenerated aggregates; the coarse aggregate is regenerated aggregate, and the fine aggregate is natural sand; the coarse aggregate is natural gravel or cobble, and the fine aggregate is regenerated aggregate; the reclaimed aggregate replaces part of the coarse aggregate or the fine aggregate.
Because the waste concrete needs to be subjected to a larger external force in the process of disintegration and crushing, micro cracks are easy to appear in the aggregate, and in addition, porous old cement mortar can be remained on the surface of the regenerated aggregate, so that the porosity of the regenerated aggregate is increased, and the water absorption rate of the regenerated aggregate are increased. Therefore, the compressive strength of recycled concrete prepared by using recycled aggregate is easily affected, and even the service life of the recycled concrete is affected.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide recycled concrete which has a good compressive strength effect.
The technical purpose of the invention is realized by the following technical scheme:
the recycled concrete comprises the following components in parts by weight: 150-280 parts of cement, 90-130 parts of water, 800-950 parts of modified and regenerated coarse aggregate, 400-530 parts of fine aggregate, 40-85 parts of fly ash, 80-100 parts of mineral powder, 50-140 parts of zeolite powder, 30-60 parts of epoxy resin, 4-10 parts of a water reducing agent and 2-6 parts of an air entraining agent; the preparation method of the modified recycled coarse aggregate comprises the following steps:
s1: taking waste concrete, crushing the waste concrete, and screening to obtain recycled coarse aggregate with the particle size of 10-25 mm;
s2: soaking the recycled coarse aggregate in the step S1 in an acetic acid solution with the mass concentration of 2-7% for 1-2h, and then airing;
s3: mixing 80-110 parts by weight of polyvinyl alcohol, 60-110 parts by weight of silica fume, 40-80 parts by weight of sodium silicate and 1000 parts by weight of 800-plus water, and fully stirring to obtain a modified solution for later use;
s4: and (3) soaking the regenerated coarse aggregate obtained in the step (S2) in the modification liquid obtained in the step (S3) for 1-2h, taking out, and then baking at the temperature of 150-.
The poor compressive strength of the recycled concrete is mainly caused by that the porosity of the recycled coarse aggregate is high due to fine cracks in the recycled coarse aggregate and residual porous old cement mortar on the surface of the recycled coarse aggregate, so that the compactness of the recycled concrete is poor, and the compressive strength is reduced. By adopting the technical scheme, the invention improves the compactness of the recycled coarse aggregate by modifying the recycled coarse aggregate, filling and sealing the pores of the recycled coarse aggregate, thereby effectively improving the compactness of the recycled concrete and improving the compressive strength and durability of the recycled concrete.
The regenerated coarse aggregate is soaked by the acetic acid solution, so that old mortar remained on the regenerated coarse aggregate can be dissolved, the old mortar adhered to the surface of the regenerated coarse aggregate is reduced, and the porosity and the water absorption of the regenerated coarse aggregate are reduced. Meanwhile, after the used mortar adhered to the surface of the recycled coarse aggregate is dissolved by acetic acid, the appearance of the recycled coarse aggregate is improved, the sphericity of the recycled coarse aggregate is improved, the fluidity of the recycled coarse aggregate is further increased, and the compactness and the compressive strength of recycled concrete are improved.
The regenerated coarse aggregate soaked by the acetic acid is modified by the modifying liquid prepared from the polyvinyl alcohol, the silica fume and the sodium silicate, and the silica fume has small average particle size, can be filled into cracks of the regenerated coarse aggregate, fills gaps of the regenerated coarse aggregate and improves the compactness of the regenerated coarse aggregate. Meanwhile, the polyvinyl alcohol further fills cracks and gaps in the recycled coarse aggregate, has a good bonding effect, and can increase the bonding strength with the recycled coarse aggregate, so that the filling effect of the recycled coarse aggregate is improved. In addition, the polyvinyl alcohol can increase the bonding strength of the silica fume and the recycled coarse aggregate, improve the compactness of the recycled coarse aggregate and reduce the water absorption rate of the recycled coarse aggregate. The sodium silicate and the polyvinyl alcohol can promote the hydration of the silica fume, and are mixed and interwoven together to form the composite cementing material which is filled in the defects of gaps, gaps and the like of the recycled coarse aggregate, so that the overall structural strength of the recycled coarse aggregate is improved.
In addition, sodium silicate can react with acetic acid to generate silicic acid, so that the acetic acid adhered to the modified recycled coarse aggregate is reduced, the corrosion to recycled concrete is reduced, and the durability of the recycled concrete is improved. After being soaked in the modifying solution, the concrete is baked at the temperature of 150-200 ℃, so that the generated silicic acid is decomposed to avoid the silicic acid from corroding the recycled concrete, and the silicon dioxide generated by the decomposition of the silicic acid can be used as a cementing material of the concrete to fill the gaps of the recycled concrete, thereby improving the compactness of the recycled concrete and further improving the compressive strength.
The addition of the fly ash, the mineral powder and the zeolite powder replaces part of cement, so that the consumption of the cement is reduced, the hydration heat of the concrete can be reduced, the temperature change process of the concrete is relatively stable, and the risk of temperature cracking of the concrete is reduced.
The zeolite powder contains active silicon dioxide, active aluminium oxide, hydrous silicon oxide and hydrous aluminium oxide, when the zeolite powder is added into concrete, under the excitation of cement activity, the silicon dioxide, active aluminium oxide, hydrous silicon oxide and hydrous aluminium oxide in the zeolite powder are hydrated with cement to produce calcium hydroxide action, so that hydrous calcium silicate gel and hydrous calcium aluminate gel are produced, the hydration degree of cement is improved, the porosity of concrete is reduced, the concrete structure is more compact, the compressive strength and the durability of concrete are improved, and the addition of the zeolite powder can save cement and reduce cost while improving the performance of concrete.
Meanwhile, the zeolite powder has strong adsorbability, can adsorb potassium ions, sodium ions and the like in concrete and sodium ions in sodium silicate, and reduces the migration speed of the sodium ions, so that the reaction of the potassium ions and the sodium ions in the concrete with active silicon in modified recycled coarse aggregates and fine aggregates is reduced, namely the reaction of alkali aggregates in the concrete is inhibited, the expansion or cracking of a concrete structure is reduced, and the durability of the concrete is improved.
The epoxy resin structure contains epoxy groups, ether bonds and hydroxyl groups with extremely high activity, so that the molecules of the epoxy resin and adjacent interfaces generate chemical bonds to form macromolecules of a three-dimensional network structure, the epoxy resin has stronger adhesive force, the connection strength of the new mortar and old concrete interfaces in the recycled concrete is increased, microcracks at the recycled concrete interfaces are reduced, the interface bonding property is improved, and the compressive strength of the recycled concrete is improved. In addition, the recycled coarse aggregate is modified by polyvinyl alcohol, the polyvinyl alcohol is adhered to the surface of the recycled coarse aggregate, and the polyvinyl alcohol is matched with the epoxy resin, so that the connection strength between the modified recycled coarse aggregate and the new mortar interface is further increased, and the compactness and the durability of the concrete are improved.
The present invention in a preferred example may be further configured to: the weight ratio of the polyvinyl alcohol to the silicon ash to the sodium silicate is 1.0 (1.0-1.2) to 0.6-0.8.
By adopting the technical scheme, the sodium silicate and the calcium hydroxide in the cement can generate calcium silicate hydrate gel, the calcium silicate hydrate gel has water absorption, the water absorption of the modified recycled aggregate is reduced, the compactness of the recycled concrete can be filled, and the surface of the recycled aggregate is more compact. However, when the generated hydrated calcium silicate is too gelled, a large amount of water is absorbed, so that the water absorption rate of the recycled aggregate is increased again, and therefore, the effect is best when the weight ratio of the polyvinyl alcohol to the silica fume to the sodium silicate is 1.0 (1.0-1.2) to 0.6-0.8.
The present invention in a preferred example may be further configured to: the raw materials also comprise 6 to 15 parts of steel fiber by weight.
Through adopting above-mentioned technical scheme, steel fibre is three-dimensional in disorder to the distribution in the concrete, and after recycled concrete is about to appear crack or the crack appears, steel fibre through with the bonding force transmission load at recycled concrete base member interface, reduces crack edge recycled concrete's tensile stress to reach the effect that prevents the production and the development of crack, can reduce the spalling of recycled concrete, improve recycled concrete's compressive strength and fracture strength.
However, since the interfacial adhesion between the steel fibers and the concrete matrix is mainly physical, that is, mainly due to the transmission of frictional shear, when the recycled concrete is broken, the adhesion between the steel fibers and the recycled concrete is poor, and the steel fibers are easily pulled out, thereby affecting the fracture strength of the recycled concrete. And the epoxy resin fills the gap between the steel fiber and the recycled concrete, so that the bonding property of the interface between the steel fiber and the recycled concrete is improved, the condition that the steel fiber is pulled out is reduced, the condition that the recycled concrete cracks is further reduced, the internal structure defects of the recycled concrete are reduced, and the compressive strength, the flexural strength and the durability of the recycled concrete are improved.
The present invention in a preferred example may be further configured to: the steel fiber is rough-surface steel fiber, and the preparation method comprises the following steps:
a. after the surface of the steel wire is degreased, washing the steel wire with clean water until the washing liquid is neutral;
b. b, placing the steel wire in the step a into an electroplating bath containing copper, carrying out copper plating on the steel wire, and drying the steel wire after the copper plating is finished to obtain the steel wire with the roughness of more than 20 microns;
c. and c, performing compression molding on the steel wire obtained in the step b and cutting to obtain the steel fiber with rough surface.
Through adopting above-mentioned technical scheme, the surperficial unevenness of the coarse profiled steel fibre in surface increases steel fibre and recycled concrete's snap-in force and frictional resistance, increases steel fibre and recycled concrete's joint strength, is convenient for transmit the load for the part that links to each other but not ftracture better through the bridging, increases recycled concrete's toughness to improve tensile strength, bending resistance and the compressive property of concrete.
The present invention in a preferred example may be further configured to: the length-diameter ratio of the rough-surface steel fiber is 40-90.
By adopting the technical scheme, when the length and diameter of the surface rough steel fiber are smaller, the connection strength of the surface rough steel fiber to concrete is poorer, when the recycled concrete cracks, the pulling strength of the recycled concrete is smaller, but the compactness of the recycled concrete is influenced, and the reinforcing effect of the surface rough steel fiber is greatly weakened; when the length-diameter ratio of the rough-surface steel fiber is larger, knotting and agglomeration easily occur in the blending process, so that the reinforcing effect of the rough-surface steel fiber is reduced, and when the length-diameter ratio of the rough-surface steel fiber is 40-90, the effect of improving the tensile strength and the breaking strength of concrete is optimal.
The present invention in a preferred example may be further configured to: the apparent density range of the recycled coarse aggregate before modification is 2300-2400kg/m3The bulk density is 1250-1300kg/m3The water absorption is 6-12%, and the crushing index value is 15-20%.
By adopting the technical scheme, the apparent density, the bulk density and the water absorption of the recycled coarse aggregate are lower than the requirements of the national standard on the coarse aggregate, and the recycled concrete with better compressive strength can be prepared by modifying the recycled coarse aggregate, which shows that the performance of the recycled coarse aggregate can be effectively modified according to the modification method.
The present invention in a preferred example may be further configured to: the fine aggregate is natural sand, and the fineness modulus is 3.0-2.3.
By adopting the technical scheme, the natural sand with larger fineness modulus can cause the segregation, bleeding and poor wrapping property of the recycled concrete, so that the modified recycled coarse aggregate in the recycled concrete is easy to expose outside, and the strength of the recycled concrete is reduced. The machine-made sand with smaller fineness modulus can cause poor fluidity and small slump of the recycled concrete and can not meet the requirements of site construction, and the main reason is that the content of stone powder in natural sand is larger, the natural sand can replace part of rubber materials in the recycled concrete, the water requirement is increased, the recycled concrete is dry and hard, has no fluidity and can not be tamped, and the compressive strength of the recycled concrete is seriously influenced.
The present invention in a preferred example may be further configured to: the water reducing agent is a polycarboxylic acid water reducing agent.
By adopting the technical scheme, the polycarboxylic acid is a high-performance water reducing agent, is a cement dispersing agent in the application of cement concrete, can reduce the mixing water consumption under the condition of keeping the cement fluidity and the using amount unchanged, thereby reducing the water cement ratio, reducing the communicated pores formed by excessive cement hydration in the solidification process of the concrete, increasing the compactness of the concrete, improving the compressive strength of the concrete and further improving the durability of the concrete.
Object two of the present invention: there is provided a method of producing recycled concrete according to any one of claims 1 to 2, comprising the steps of: based on the weight portion, the weight portion of the material is,
s1: mixing the modified regenerated coarse aggregate, the fine aggregate and half of water in parts by weight, and uniformly stirring to obtain an aggregate mixture;
s2: and (4) adding the cement, the fly ash, the mineral powder, the zeolite powder, the epoxy resin, the water reducing agent, the air entraining agent and the balance of water into the aggregate mixture prepared in the step S1, and uniformly stirring to obtain the recycled concrete.
The third purpose of the invention is that: there is provided a method for the preparation of recycled concrete according to any one of claims 3 to 8, comprising the steps of, in parts by weight,
s1: mixing the modified recycled coarse aggregate, the fine aggregate, the steel fiber and half of water in parts by weight, and uniformly stirring to obtain an aggregate mixture;
s2: and (4) adding the cement, the fly ash, the mineral powder, the zeolite powder, the epoxy resin, the water reducing agent, the air entraining agent and the balance of water into the aggregate mixture prepared in the step S1, and uniformly stirring to obtain the recycled concrete.
By adopting the technical scheme, firstly, half of water is adopted to pre-wet the modified recycled coarse aggregate, the fine aggregate and the steel fiber, so that the modified recycled coarse aggregate, the fine aggregate and the steel fiber are conveniently and uniformly dispersed, and the inactive dust on the surface of the recycled coarse aggregate is reduced, thereby being beneficial to improving the strength of recycled concrete; then, raw materials such as cement, fly ash, mineral powder and the like are added, so that the cement, the fly ash and the mineral powder fill some pores and cracks, the compactness of the recycled concrete is increased, and the compressive strength is improved.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the regenerated coarse aggregate is modified by carrying out acetic acid soaking and modification liquid soaking on the regenerated coarse aggregate, so that the compactness and sphericity of the regenerated coarse aggregate are improved, the apparent density of the regenerated coarse aggregate is improved, and the water absorption rate is reduced; the modified coarse aggregate is matched with the zeolite powder and the epoxy resin, so that the interface bonding strength with the recycled concrete is increased, the cracks at the interface are reduced, and the compressive strength of the recycled concrete is improved.
2. The rough surface steel fiber is distributed in the concrete in a three-dimensional random mode, and the rough surface steel fiber transmits load through the bonding force with the interface of the recycled concrete matrix, so that the tensile stress of the recycled concrete at the edge of a crack is reduced, the effect of preventing the generation and the development of the crack is achieved, and the compressive strength and the fracture resistance of the recycled concrete are improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the following examples and comparative examples:
the cement is P.O42.5 ordinary portland cement produced by Yangquan Jidong cement factories;
the fly ash is grade II fly ash produced by Lihui mineral products Co., Ltd in Dongguan city;
the mineral powder is S95 mineral powder produced by Lihui mineral products Co., Ltd, Dongguan city;
the apparent density range of the recycled coarse aggregate is 2300-2400kg/m3The water absorption rate is 6-12%, and the crushing index value is 15-20%; the fine aggregate is natural sand produced by Yongxing stone factory of Shouyang, and the fineness modulus of the natural sand is 3.0-2.3;
the zeolite powder is produced by mineral processing plants in mountain and river in Lingshou county;
the steel fiber is rough-surface steel fiber produced by Tianyi engineering fiber company Limited in Changzhou city;
the water reducing agent is a polycarboxylic acid water reducing agent produced by Shanxi Baichuan-sourced novel building materials Co;
the air entraining agent is rosin soap produced by Shanxi Baichuan-sourced novel building material company Limited;
the silica fume is purchased from silicon micro-silica powder company of the Minam Pengcheng;
epoxy resin was purchased from tin-free long drying chemical company, ltd;
polyvinyl alcohol and sodium silicate are purchased from chemical markets of Shandong Jinan city.
Example 1
The recycled concrete comprises, by weight, 150 parts of cement, 90 parts of water, 800 parts of modified recycled coarse aggregate, 400 parts of natural sand, 40 parts of fly ash, 80 parts of mineral powder, 50 parts of zeolite powder, 30 parts of epoxy resin, 4 parts of a water reducing agent and 2 parts of an air entraining agent;
the preparation method of the recycled concrete comprises the following steps:
the preparation method of the modified recycled coarse aggregate comprises the following steps:
s1: taking waste concrete, crushing the waste concrete, and screening to obtain recycled coarse aggregate with the particle size of 10-25 mm;
s2: soaking the recycled coarse aggregate in the step S1 in an acetic acid solution with the mass concentration of 2% for 1h, and then airing;
s3: mixing 80 parts by weight of polyvinyl alcohol, 60 parts by weight of silica fume, 40 parts by weight of sodium silicate and 800 parts by weight of water, and fully stirring to obtain modified liquid for later use;
s4: and (4) soaking the regenerated coarse aggregate obtained in the step (S2) into the modification solution obtained in the step (S3) for 1h, taking out, placing at the temperature of 150 ℃, and baking for 1h to obtain the modified regenerated coarse aggregate.
The preparation method of the recycled concrete comprises the following steps:
s5: mixing the modified recycled coarse aggregate, the natural sand and half of water in parts by weight, and uniformly stirring to obtain an aggregate mixture;
s6: and adding the cement, the fly ash, the mineral powder, the zeolite powder, the epoxy resin, the water reducing agent, the air entraining agent and the balance of water into the aggregate mixture prepared in the step S5, and uniformly stirring to obtain the recycled concrete.
Example 2
The recycled concrete comprises 215 parts of cement, 110 parts of water, 875 parts of modified recycled coarse aggregate, 465 parts of natural sand, 62.5 parts of fly ash, 90 parts of mineral powder, 95 parts of zeolite powder, 45 parts of epoxy resin, 7 parts of a water reducing agent and 4 parts of an air entraining agent;
the preparation method of the recycled concrete comprises the following steps:
the preparation method of the modified recycled coarse aggregate comprises the following steps:
s1: taking waste concrete, crushing the waste concrete, and screening to obtain recycled coarse aggregate with the particle size of 10-25 mm;
s2: soaking the recycled coarse aggregate in the step S1 in an acetic acid solution with the mass concentration of 4.5% for 1.5h, and then airing;
s3: according to the parts by weight, fully stirring 95 parts of polyvinyl alcohol, 85 parts of silica fume, 60 parts of sodium silicate and 900 parts of water to obtain a modified solution for later use;
s4: and (4) soaking the regenerated coarse aggregate obtained in the step (S2) into the modification liquid obtained in the step (S3) for 1.5h, taking out, placing at 175 ℃, and baking for 1.5h to obtain the modified regenerated coarse aggregate.
The preparation method of the recycled concrete comprises the following steps:
s5: mixing the modified recycled coarse aggregate, the natural sand and half of water in parts by weight, and then uniformly stirring to obtain an aggregate mixture;
s6: and (4) adding the cement, the fly ash, the mineral powder, the zeolite powder, the epoxy resin, the water reducing agent, the air entraining agent and the balance of water into the aggregate mixture prepared in the step S5, and uniformly stirring to obtain the recycled concrete.
Example 3
The recycled concrete comprises 280 parts by weight of cement, 130 parts by weight of water, 950 parts by weight of modified recycled coarse aggregate, 530 parts by weight of natural sand, 85 parts by weight of fly ash, 100 parts by weight of mineral powder, 140 parts by weight of zeolite powder, 60 parts by weight of epoxy resin, 10 parts by weight of water reducer and 6 parts by weight of air entraining agent;
the preparation method of the recycled concrete comprises the following steps:
the preparation method of the modified recycled coarse aggregate comprises the following steps:
s1: taking waste concrete, crushing the waste concrete, and screening to obtain recycled coarse aggregate with the particle size of 10-25 mm;
s2: soaking the recycled coarse aggregate in the step S1 in an acetic acid solution with the mass concentration of 7% for 2h, and then airing;
s3: according to the parts by weight, fully stirring 110 parts of polyvinyl alcohol, 110 parts of silica fume, 80 parts of sodium silicate and 1000 parts of water to obtain a modified solution for later use;
s4: and (4) soaking the regenerated coarse aggregate obtained in the step (S2) into the modification solution obtained in the step (S3) for 2 hours, taking out, placing at the temperature of 200 ℃, and baking for 2 hours to obtain the modified regenerated coarse aggregate.
The preparation method of the recycled concrete comprises the following steps:
s5: mixing the modified recycled coarse aggregate, the natural sand and half of water in parts by weight, and uniformly stirring to obtain an aggregate mixture;
s6: and adding the cement, the fly ash, the mineral powder, the zeolite powder, the epoxy resin, the water reducing agent, the air entraining agent and the balance of water into the aggregate mixture prepared in the step S5, and uniformly stirring to obtain the recycled concrete.
Example 4
A recycled concrete, which is different from example 2 in that 90 parts of polyvinyl alcohol, 90 parts of silica fume and 54 parts of sodium silicate are used in the step S3, i.e., the weight ratio of polyvinyl alcohol to silica fume to sodium silicate is 1.0:1.0: 0.6.
Example 5
A recycled concrete, which is different from example 2 in that 90 parts of polyvinyl alcohol, 99 parts of silica fume and 63 parts of sodium silicate are used in the step S3, i.e., the weight ratio of polyvinyl alcohol to silica fume to sodium silicate is 1.0:1.1: 0.7.
Example 6
A recycled concrete, which is different from example 2 in that 90 parts of polyvinyl alcohol, 108 parts of silica fume and 72 parts of sodium silicate are used in the step S3, namely the weight ratio of polyvinyl alcohol to silica fume to sodium silicate is 1.0:1.2: 0.8.
Example 7
A recycled concrete is different from example 2 in that 6 parts of steel fibers, in which the aspect ratio of the steel fibers is 40, are added in step S5.
Example 8
A recycled concrete, which is different from example 2 in that 10.5 parts of steel fibers, wherein the aspect ratio of the steel fibers is 65, are added in step S5.
Example 9
A recycled concrete is different from example 2 in that 15 parts of steel fibers, in which the aspect ratio of the steel fibers is 90, are added in step S5.
Example 10
A recycled concrete is different from the recycled concrete in example 8 in that the steel fibers are rough-surfaced steel fibers, and the preparation method comprises the following steps:
a. after the surface of the steel wire is degreased, washing the steel wire with clean water until the washing liquid is neutral;
b. b, placing the steel wire in the step a into an electroplating bath containing copper, carrying out copper plating on the steel wire, and drying the steel wire after the copper plating is finished to obtain the steel wire with the roughness of more than 20 microns;
c. and c, performing compression molding on the steel wire obtained in the step b and cutting to obtain the steel fiber with rough surface.
Comparative example 1
A recycled concrete which is different from that of example 2 in that the modified recycled coarse aggregate is replaced with the unmodified recycled coarse aggregate in the same amount in the components used.
Comparative example 2
The recycled concrete is different from the recycled concrete in example 5 in that 80 parts of polyvinyl alcohol, 64 parts of silica fume and 40 parts of sodium silicate are adopted, namely the weight ratio of the polyvinyl alcohol to the silica fume to the sodium silicate is 1.0:0.8: 0.5.
Comparative example 3
The recycled concrete is different from the recycled concrete in example 5 in that 80 parts of polyvinyl alcohol, 104 parts of silica fume and 72 parts of sodium silicate are adopted, namely the weight ratio of the polyvinyl alcohol to the silica fume to the sodium silicate is 1.0:1.3: 0.9.
Comparative example 4
A recycled concrete which differs from example 8 in that in the components used, steel fibers having an aspect ratio of 30 were used.
Comparative example 5
A recycled concrete which differs from example 8 in that, among the components used, steel fibers having an aspect ratio of 100 are used.
Performance detection
The properties of the recycled concrete in examples 1 to 10 and comparative examples 1 to 5 were measured by the following methods.
① compressive strength, preparing standard test block according to GB/T50081-2016 Standard test method for mechanical Properties of ordinary concrete, and measuring the compressive strength of the standard test block maintained for 7 days and 28 days.
② bending strength, preparing standard test block according to GB/T50081-2016 Standard test method for mechanical Properties of ordinary concrete, and measuring the bending strength of the standard test block maintained for 7d and 28 d.
③ the water absorption (%) of the recycled concrete is detected according to ASTMC1585-2013 Standard test method for measuring the Water absorption of Water-hard Cement concrete.
④ resistance to chloride ion penetration, testing the chloride ion penetration depth of the standard test block according to the rapid chloride ion migration coefficient method in GB/T50082-2009 Standard test method for testing the long-term performance and durability of ordinary concrete.
The concrete test results for examples 1 to 10 and comparative examples 1 to 5 are shown in Table 1.
TABLE 1 concrete durability test data
From table 1, it can be seen that:
the flexural strength, the compressive strength, the water absorption and the chloride ion permeation resistance of the recycled concrete in the examples 1 to 10 are all superior to those of the recycled concrete in the comparative examples 1 to 5, which shows that the interrelation among the formulas of the recycled concrete of the invention is scientific and reasonable, the compressive strength and the flexural strength of the recycled concrete can be effectively improved, meanwhile, the chloride ion corrosion resistance of the recycled concrete can be improved, and the performance of the concrete is integrally improved.
Compared with examples 7-9, the flexural strength, compressive strength, water absorption and chloride ion permeability of the recycled concrete in examples 7-9 are obviously superior to the properties of the recycled concrete in examples 1-3, which shows that the addition of the steel fiber can prevent the generation and development of cracks on the recycled concrete, reduce the defects of the internal structure of the recycled concrete, and improve the compressive property of the concrete; meanwhile, the matching of the steel fiber and the epoxy resin increases the bonding strength of the steel fiber and the section of the recycled concrete, reduces the pulling-out condition of the steel fiber and improves the anti-bending performance of the recycled concrete.
Compared with the example 10, the flexural strength, the compressive strength, the water absorption and the chloride ion permeability of the recycled concrete in the example 10 are obviously superior to the properties of the recycled concrete in the example 7 to 9, which shows that the steel fiber can obviously improve the properties of the concrete after being subjected to surface roughness treatment, thereby improving the durability of the concrete.
Compared with comparative examples 4 and 5, the flexural strength, compressive strength, water absorption and chloride ion permeability of the recycled concrete in examples 7 to 9 are obviously superior to those of the recycled concrete in comparative example 4 and 5, and the aspect ratio of the steel fiber is in the range of 40-90, which shows that the effect is best.
Compared with the comparative example 1, the flexural strength, the compressive strength, the water absorption and the chloride ion permeability of the recycled concrete in the examples 1 and 2 are obviously superior to the properties of the recycled concrete in the comparative example 1, which shows that the performance of the recycled coarse aggregate can be effectively improved by modifying the recycled coarse aggregate by adopting the method of the invention, the modified coarse aggregate is matched with other components in the components, the compressive strength, the flexural strength, the water absorption and the chloride ion permeability of the recycled concrete are effectively improved, and the durability of the recycled concrete is obviously improved on the whole.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. A recycled concrete characterized by: the coating comprises the following components in parts by weight: 150-280 parts of cement, 90-130 parts of water, 800-950 parts of modified and regenerated coarse aggregate, 400-530 parts of fine aggregate, 40-85 parts of fly ash, 80-100 parts of mineral powder, 50-140 parts of zeolite powder, 30-60 parts of epoxy resin, 4-10 parts of a water reducing agent and 2-6 parts of an air entraining agent; the preparation method of the modified recycled coarse aggregate comprises the following steps:
s1: taking waste concrete, crushing the waste concrete, and screening to obtain recycled coarse aggregate with the particle size of 10-25 mm;
s2: soaking the recycled coarse aggregate in the step S1 in an acetic acid solution with the mass concentration of 2-7% for 1-2h, and then airing;
s3: mixing 80-110 parts by weight of polyvinyl alcohol, 60-110 parts by weight of silica fume, 40-80 parts by weight of sodium silicate and 1000 parts by weight of 800-plus water, and fully stirring to obtain a modified solution for later use;
s4: and (3) soaking the regenerated coarse aggregate obtained in the step (S2) in the modification liquid obtained in the step (S3) for 1-2h, taking out, and then baking at the temperature of 150-.
2. A recycled concrete as claimed in claim 1, wherein: the weight ratio of the polyvinyl alcohol to the silicon ash to the sodium silicate is 1.0 (1.0-1.2) to 0.6-0.8.
3. A recycled concrete as claimed in claim 1, wherein: the raw materials also comprise 6 to 15 parts of steel fiber by weight.
4. A recycled concrete as claimed in claim 3, wherein: the steel fiber is rough-surface steel fiber, and the preparation method comprises the following steps:
a. after the surface of the steel wire is degreased, washing the steel wire with clean water until the washing liquid is neutral;
b. b, placing the steel wire in the step a into an electroplating bath containing copper, carrying out copper plating on the steel wire, and drying the steel wire after the copper plating is finished to obtain the steel wire with the roughness of more than 20 microns;
c. and c, performing compression molding on the steel wire obtained in the step b and cutting to obtain the steel fiber with rough surface.
5. A recycled concrete as claimed in claim 4, wherein: the length-diameter ratio of the rough-surface steel fiber is 40-90.
6. A recycled concrete as claimed in claim 1, wherein: the apparent density range of the recycled coarse aggregate before modification is 2300-2400kg/m3The water absorption is 6-12%, and the crushing index value is 15-20%.
7. A recycled concrete as claimed in claim 1, wherein: the fine aggregate is natural sand, and the fineness modulus is 3.0-2.3.
8. A recycled concrete as claimed in claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.
9. A method of producing recycled concrete according to any one of claims 1-2, characterized in that: comprises the following steps of, by weight portion,
s1: mixing the modified regenerated coarse aggregate, the fine aggregate and half of water in parts by weight, and uniformly stirring to obtain an aggregate mixture;
s2: and (4) adding the cement, the fly ash, the mineral powder, the zeolite powder, the epoxy resin, the water reducing agent, the air entraining agent and the balance of water into the aggregate mixture prepared in the step S1, and uniformly stirring to obtain the recycled concrete.
10. A method of producing recycled concrete according to any one of claims 3 to 8, characterized in that: comprises the following steps of, by weight portion,
s1: mixing the modified recycled coarse aggregate, the fine aggregate, the steel fiber and half of water in parts by weight, and uniformly stirring to obtain an aggregate mixture;
s2: and (4) adding the cement, the fly ash, the mineral powder, the zeolite powder, the epoxy resin, the water reducing agent, the air entraining agent and the balance of water into the aggregate mixture prepared in the step S1, and uniformly stirring to obtain the recycled concrete.
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