CN106927756B - A kind of regeneration concrete - Google Patents
A kind of regeneration concrete Download PDFInfo
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- CN106927756B CN106927756B CN201710231317.XA CN201710231317A CN106927756B CN 106927756 B CN106927756 B CN 106927756B CN 201710231317 A CN201710231317 A CN 201710231317A CN 106927756 B CN106927756 B CN 106927756B
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- 239000004567 concrete Substances 0.000 title claims abstract description 81
- 230000008929 regeneration Effects 0.000 title abstract 5
- 238000011069 regeneration method Methods 0.000 title abstract 5
- 239000000463 material Substances 0.000 claims abstract description 54
- 239000002245 particle Substances 0.000 claims abstract description 38
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000654 additive Substances 0.000 claims abstract description 29
- 230000000996 additive effect Effects 0.000 claims abstract description 28
- 229920003023 plastic Polymers 0.000 claims abstract description 26
- 239000004576 sand Substances 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims description 31
- 239000002699 waste material Substances 0.000 claims description 29
- 239000002994 raw material Substances 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 17
- 239000004925 Acrylic resin Substances 0.000 claims description 16
- 229920000178 Acrylic resin Polymers 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 11
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 10
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 150000008130 triterpenoid saponins Chemical class 0.000 claims description 6
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 5
- 229920000877 Melamine resin Polymers 0.000 claims description 5
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 5
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 5
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000005469 granulation Methods 0.000 claims description 2
- 230000003179 granulation Effects 0.000 claims description 2
- 239000004566 building material Substances 0.000 abstract description 3
- 230000001172 regenerating effect Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 23
- 230000035515 penetration Effects 0.000 description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 13
- 238000003756 stirring Methods 0.000 description 12
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 10
- 238000010276 construction Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
- 239000006087 Silane Coupling Agent Substances 0.000 description 6
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 6
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 6
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 6
- 239000004408 titanium dioxide Substances 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 5
- 239000011324 bead Substances 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 5
- 229910010271 silicon carbide Inorganic materials 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- 235000010288 sodium nitrite Nutrition 0.000 description 5
- 229920001661 Chitosan Polymers 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000011449 brick Substances 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000012634 fragment Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 239000013049 sediment Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 125000003158 alcohol group Chemical group 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
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- 238000001179 sorption measurement Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- 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
- 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
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/304—Air-entrainers
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of regeneration concretes, it is made of cementitious material, coarse aggregate, fine aggregate, additive, natural river sand and water, each material weight number used is as follows in the regeneration concrete: 300~470 parts of cementitious material, 900~1200 parts of coarse aggregate, 60~250 parts of fine aggregate, 125~375 parts of regenerating and modifying PET plastic particle, 5~8 parts of additive, 400~700 parts of natural river sand, water-cement ratio 0.3~0.45, air entraining agent are the 0.01-0.03% that quality is added in cementitious material.A kind of regeneration concrete of the invention can rationally utilize building material, improve regeneration concrete impermeability, endurance quality difference problem in the prior art.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to recycled concrete.
Background
With the continuous deepening of the environmental protection concept of energy conservation, emission reduction and resource recycling, the recycling problem of the waste concrete has become the focus of the research on recycling of construction waste at home and abroad.
The concrete fragments are the largest component of the construction waste, and the crushed and screened concrete fragments of the concrete fragments can be used for replacing natural aggregates in concrete or used as the foundation of roads. This type of recycled material is called recycled aggregate. Recycled aggregate has been successfully used in the construction industry in some countries developed in europe and america.
Although there have been some studies on recycled aggregate concrete, the following problems still remain:
(1) the recycled concrete mainly comprises natural aggregate, the proportion of the recycled aggregate is low, and the recycled aggregate cannot be fully utilized;
(2) the recycled aggregate is used for replacing the natural aggregate, but the performance of the recycled aggregate is not researched, so that the recycled aggregate is unscientific to use, and the performances such as impermeability and durability of concrete are poor.
Disclosure of Invention
The invention aims to provide recycled concrete, which can reasonably utilize building materials and solve the problems of poor impermeability and durability of the recycled concrete in the prior art.
In order to achieve the purpose, the invention provides recycled concrete which comprises a cementing material, a coarse aggregate, a fine aggregate, an additive, natural river sand, recycled modified PET plastic particles, an air entraining agent and water, wherein the recycled concrete comprises the following materials in parts by weight:
300-470 parts of cementing material
900-1200 parts of coarse aggregate
60-250 parts of fine aggregate
5-8 parts of additive
400-700 parts of natural river sand
125-375 parts of regenerated modified PET plastic particles
The water-to-glue ratio is 0.3-0.45
The air entraining agent is 0.01-0.03% of the added mass of the cementing material.
Preferably, in the above technical scheme, the admixture is composed of the following raw materials in parts by weight: 50 parts of a polycarboxylic acid water reducing agent, 10 parts of cellulose grafted chitosan, 10 parts of flue sediment, 5 parts of a silane coupling agent, 3 parts of polyvinylpyrrolidone, 5 parts of silicon carbide, 5 parts of hollow glass beads, 6 parts of silicon dioxide coated titanium dioxide, 3 parts of lime, 10 parts of sodium nitrite and 2 parts of triethanolamine.
Preferably, in the above technical scheme, the air entraining agent is composed of the following raw materials in parts by weight: 55 parts of rosin powder, 16 parts of triterpenoid saponin, 12 parts of sodium hydroxide, 9 parts of sulfuric acid, 12 parts of ethylene glycol, 10 parts of bisphenol A, 8 parts of pentaerythritol, 100 parts of water and 16 parts of melamine.
Preferably, in the above technical scheme, the recycled modified PET plastic particles are prepared by adding active CaCO into pretreated waste PET chips3Mixing the acrylic resin and the acrylic resin uniformly, adding the mixture into a double-screw extruder, heating, plasticizing and melting the mixture, filtering impurities by using a filter with an effective filtering pore diameter of 200-300 meshes to obtain a melt, discharging the melt from a head sheet material hole or a strip material hole, cooling and granulating the melt to obtain the acrylic resin melt;
wherein the heating temperature is 150-200 ℃, the plasticizing temperature is 260-285 ℃, the melting temperature is 270-300 ℃, the temperature of a die of a sheet material hole or a strip material hole in a machine head is 275 ℃, the rotating speed of a double screw is 150rpm, the absolute pressure of an exhaust hole of an extruder is 133Pa, and the material is cut into polyhedral particles with the particle size of 1.5-3.5 mm during granulation.
Preferably, in the above technical solution, the waste PET chips, active CaCO3The weight portion ratio of the acrylic resin to the acrylic resin is 100:20: 5.
Preferably, in the above technical scheme, the cementitious material is composed of the following raw materials in parts by weight: 200-420 parts of cement and 30-150 parts of a blending material, wherein the blending material comprises the following raw materials in parts by weight: 30-150 parts of fly ash and 30-90 parts of slag powder.
Preferably, in the technical scheme, the particle size of the natural river sand is 0.075-4.0 mm.
Preferably, in the technical scheme, the coarse aggregate comprises 200-1000 parts by weight of natural coarse aggregate and 200-840 parts by weight of recycled coarse aggregate, the particle size of the natural coarse aggregate is 7-25 mm, and the particle size of the recycled coarse aggregate is 4.5-20 mm.
Preferably, in the above technical solution, the particle size of the fine aggregate is 2mm to 4 mm.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, part of construction waste such as construction waste concrete and waste bricks and waste PET plastic are added into the concrete formula, and the waste concrete and waste bricks are recycled, so that waste is changed into valuable, the cost is reduced, and good economic and environmental benefits are achieved. Meanwhile, proper additives, air entraining agents and regenerated modified PET plastic particles are added, the substitution rate of the regenerated coarse aggregate is reasonably selected, the anti-permeability performance of the regenerated concrete is improved, and the durability of the regenerated concrete is improved.
Detailed Description
Reference will now be made in detail to the present embodiments of the invention, with the understanding that the scope of the invention is not limited to the specific embodiments. Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
The mix proportion design:
the recycled concrete of the invention is composed of the following raw materials in parts by weight:
300-470 parts of a cementing material, 900-1200 parts of a coarse aggregate, 60-250 parts of a fine aggregate, 5-8 parts of an additive, 400-700 parts of natural river sand, 125-375 parts of regenerated modified PET plastic particles, 0.3-0.45 of a water-cement ratio, and 0.01-0.03% of an air entraining agent in terms of the mass of the cementing material.
The concrete raw material selection table of the invention comprises the following steps:
TABLE 1 concrete raw material selecting table
Wherein,
preparing an additive:
the additive is composed of the following raw materials in parts by weight: 40-50 parts of a polycarboxylic acid water reducing agent, 10-15 parts of cellulose grafted chitosan, 10-15 parts of flue sediment, 5-8 parts of a silane coupling agent, 2-5 parts of polyvinylpyrrolidone, 4-6 parts of silicon carbide, 4-6 parts of hollow glass beads, 5-8 parts of silicon dioxide coated titanium dioxide, 3-5 parts of lime, 10-15 parts of sodium nitrite and 1-3 parts of triethanolamine; the admixture selected in the embodiment of the invention preferably comprises the following components in parts by weight: 50 parts of a polycarboxylic acid water reducing agent, 10 parts of cellulose grafted chitosan, 10 parts of flue sediment, 5 parts of a silane coupling agent, 3 parts of polyvinylpyrrolidone, 5 parts of silicon carbide, 5 parts of hollow glass beads, 6 parts of silicon dioxide coated titanium dioxide, 3 parts of lime, 10 parts of sodium nitrite and 2 parts of triethanolamine.
The preparation method of the additive comprises the following steps: uniformly mixing 10 parts of powdery cellulose grafted chitosan, 10 parts of flue sediment, 5 parts of silane coupling agent, 3 parts of polyvinylpyrrolidone, 5 parts of silicon carbide, 5 parts of hollow glass beads, 6 parts of silicon dioxide coated titanium dioxide, 3 parts of lime and 10 parts of sodium nitrite, and packaging for later use, wherein the mixture is used as a solid component of a concrete admixture, and 50 parts of polycarboxylic water reducer and 2 parts of triethanolamine are packaged separately;
the required additive is prepared according to the preparation method of the additive, and the amount of the additive is 5-8 parts.
The silane coupling agent and the polyvinylpyrrolidone in the admixture are organic substances, the polyvinylpyrrolidone has certain viscosity and can enhance the cohesiveness among all the components, and the silane coupling agent reacts with water to form a network structure, thereby enhancing the water retention and the fluidity of the concrete and ensuring the slump loss of the ready-mixed concrete.
The silicon carbide in the admixture has high strength and good weather resistance, and can improve the strength and the weather resistance of concrete.
The hollow glass beads in the additive have a certain heat insulation effect and can also enable all components to be uniformly dispersed.
The silicon dioxide coated titanium dioxide in the admixture can increase the strength of concrete, can adsorb soil, reduce the adsorption of the soil to a water reducing agent, aggregate and the like, reduce the influence of the soil on the concrete, and meanwhile, the rutile type titanium dioxide can reflect the sunlight in visible and infrared regions, thereby prolonging the service life of the concrete.
A small amount of lime powder, 10 parts of sodium nitrite and 2 parts of triethanolamine in the additive are dissolved in water and have certain cohesiveness, so that the soil in the mortar can be adsorbed, all the components can be well combined under the condition of less water, and the occurrence of segregation and bleeding is reduced.
The addition amount of the additive is verified by tests, and preferably the addition weight part ratio of the additive to the cementing material is as follows: 5-8: 300-470 parts, most preferably 6.2 parts by weight of the admixture, namely 6.2kg/m of the admixture is optimally added when preparing the concrete of the invention3。
Preparing an air entraining agent:
the air entraining agent is composed of the following raw materials in parts by weight: 40-60 parts of rosin powder, 10-20 parts of triterpenoid saponin, 10-18 parts of sodium hydroxide, 6-16 parts of sulfuric acid, 8-18 parts of ethylene glycol, 5-13 parts of bisphenol A, 7-15 parts of pentaerythritol, 90-130 parts of water and 15-20 parts of melamine. The air entraining agent selected in the embodiment of the invention preferably comprises the following components in parts by weight: 55 parts of rosin powder, 16 parts of triterpenoid saponin, 12 parts of sodium hydroxide, 9 parts of sulfuric acid, 12 parts of ethylene glycol, 10 parts of bisphenol A, 8 parts of pentaerythritol, 100 parts of water and 16 parts of melamine.
The preparation method of the air entraining agent comprises the following steps: mixing all the raw materials, stirring for 35min, putting into a reaction kettle, raising the temperature to 80 ℃, and preserving the heat for 1h to obtain the product.
The doping amount of the air entraining agent is verified by experiments, preferably 0.01-0.03% of the added mass of the cementing material, and most preferably 0.025% of the added mass of the cementing material.
Preparing regenerated modified PET plastic particles:
according to pretreated waste PET fragments, activated CaCO3Preparing raw material components of the regenerated modified PET plastic particles with the acrylic resin in a weight ratio of 100:20:5 respectively, and then preparing the regenerated modified PET plastic particles by the following steps;
adding active CaCO into waste PET chips prepared according to the weight ratio3And acrylic resin, uniformly mixing, adding the mixture into a double-screw extruder, heating, plasticizing, melting, filtering impurities by using a filter with an effective filtering pore diameter of 200-300 meshes to obtain a melt, discharging the melt from a head sheet material hole or a strip material hole, preferably selecting the strip material hole, cooling and granulating to obtain the acrylic resin.
Wherein the heating temperature is 150-200 ℃, preferably 170 ℃, the plasticizing temperature is 260-285 ℃, preferably 275 ℃, the melting temperature is 270-300 ℃, preferably 285 ℃, the die temperature of a sheet material hole or a strip material hole in a machine head is 275 ℃, the rotating speed of a double screw is 150rpm, the absolute pressure of an exhaust hole of an extruder is 133Pa, and the material is cut into polyhedral particles with the particle size of 1.5-3.5 mm, preferably 2mm when being cut into particles.
The pretreatment of the waste PET chips in the present invention includes separation, crushing, washing and drying of the waste PET plastic products and waste materials.
Using activated CaCO3And acrylic resin to modify the waste PET chips for recycling, due to the active CaCO3The acrylic resin with good viscosity and thermoplasticity has good physical and mechanical properties, weather resistance, chemical resistance and water resistance, thereby improving the density of the recycled waste PET plastic, improving the tensile strength, rigidity and stiffness, further improving the impact resistance and toughness, stabilizing and reducing the contraction and expansion of a system, ensuring that the rigidity, stiffness and strength of the recycled modified PET plastic particles meet the requirements of concrete materials, the recycled modified PET plastic prepared by the method is extruded in a strip shape, and is cut into multi-surface particles after being cooled, the section formed during cutting is in a rough ridge shape, and a large number of small and numerous small holes are formed on the section, thus the recycled modified PET plastic has good physical and mechanical properties, good weather resistance, good chemical resistance and good water resistance, and can meet the requirements of concrete materialsThe small holes are due to the acrylic resin and CaCO3The rough cross section and the small holes can absorb a large amount of impact energy caused by the fracture of the net-shaped structure after the gluing, thereby being beneficial to improving the impact strength of the material.
The recycled concrete of the invention is divided into 4 examples to prove, in order to better verify the used building materials which are reasonably utilized, the problem of poor impermeability and durability of the recycled concrete in the prior art is verified and improved by designing proper raw material proportion.
Example 1
The concrete formula is as follows: 300 parts of cementing material, 900 parts of coarse aggregate, 60 parts of fine aggregate, 5 parts of additive, 0.015 part of air entraining agent, 400 parts of natural river sand, 0.3 part of water-to-glue ratio and 125 parts of regenerated modified PET plastic particles. Wherein, the cementing material comprises 225 parts of cement and 75 parts of fly ash; 63 parts of recycled coarse aggregate and 837 parts of natural crushed stone.
The preparation method comprises the steps of mixing the natural river sand, the cement, the fly ash and the water, dripping the air entraining agent into the mixture, stirring the mixture for 70 seconds, adding the admixture into the mixture after the mixture is uniform, stirring the mixture for 30 seconds, adding the regenerated modified PET plastic particles, the regenerated coarse aggregate and the natural macadam into the mixture, and then uniformly stirring the mixture.
Example 2
The concrete formula is as follows: 405 parts of a cementing material, 1051 parts of coarse aggregate, 74 parts of fine aggregate, 5.6 parts of an additive, 556 parts of natural river sand, 250 parts of regenerated modified PET plastic particles and 0.34 of water-to-glue ratio, wherein the air entraining agent is 0.018 mass percent of the cementing material. Wherein, the cementing material comprises 266 parts of cement, 94 parts of fly ash and 45 parts of slag powder; 578 parts of recycled coarse aggregate and 473 parts of natural macadam.
The preparation method comprises the following steps: mixing natural river sand, cement, fly ash and water, dripping an air entraining agent into the mixture, stirring the mixture for 75 seconds, adding an additive into the mixture after the mixture is uniform, stirring the mixture for 25 seconds, adding a regenerated coarse aggregate and natural crushed stone into the mixture, and then stirring the mixture uniformly.
Example 3
The concrete formula is as follows: 405 parts of a cementing material, 1051 parts of coarse aggregate, 74 parts of fine aggregate, 5.6 parts of an additive, 0.020% of air entraining agent added by mass of the cementing material, 556 parts of natural river sand, 188 parts of regenerated modified PET plastic particles and 0.34 of water-to-gel ratio. Wherein, the cementing material comprises 266 parts of cement, 94 parts of fly ash and 45 parts of slag powder; 578 parts of recycled coarse aggregate and 473 parts of natural macadam.
The preparation method comprises the following steps: mixing natural river sand, cement, fly ash and water, dripping an air entraining agent into the mixture, stirring the mixture for 80 seconds, adding an additive into the mixture after the mixture is uniform, stirring the mixture for 30 seconds, adding a regenerated coarse aggregate and natural crushed stone into the mixture, and then stirring the mixture uniformly.
Example 4
405 parts of a cementing material, 1150 parts of a coarse aggregate, 74 parts of a fine aggregate, 6.2 parts of an additive, 0.025% of an air entraining agent by mass of the cementing material, 546 parts of natural river sand, 375 parts of regenerated modified PET plastic particles and 0.42 of water-to-gel ratio. Wherein the cementing material comprises 254 parts of cement, 100 parts of fly ash and 68 parts of slag powder; 439 parts of recycled coarse aggregate and 711 parts of natural macadam.
The preparation method comprises the following steps: mixing natural river sand, cement, fly ash and water, dripping an air entraining agent, stirring for 85s, adding an additive after the mixture is uniform, adding a regenerated coarse aggregate and natural macadam after the mixture is stirred for 30s, and then uniformly stirring.
Comparative example 1, example 2, example 3 and example 4 analysis:
table 2 analysis of the overall properties of comparative example 1, example 2, example 3 and example 4
From example 1, example 2, example 3 and example 4 in table 2, 4 different concretes of the invention have a structure with non-polar groups (hydrocarbon chains) and polar groups (such as alcohol group — OH, etc.) under the interaction of rosin powder, triterpenoid saponin, sulfuric acid, sodium hydroxide, pentaerythritol, melamine, etc. after the air entraining agent is introduced. After the air entraining agent molecules are dissolved in water, the nonpolar group of the air entraining agent molecules goes deep into the gas phase and the polar group is remained in the water, so that the air entraining agent molecules are adsorbed on the liquid-gas interface of the air bubbles to form directional arrangement. As shown in Table 2, the concrete of the present invention has excellent durability as shown by the following results that the compressive strength ratios (%) of examples 1, 2, 3 and 4 are 102.6 to 105.7 and the relative durability index (%) is 87.2 to 94.5 when the strength of examples 1, 2, 3 and 4 is 23.2 to 29.4MPa and the compressive strength ratio (%) is 98.4 to 104.2 at 7d and when the strength of examples 1, 2, 3 and 4 is 28 d.
In addition, air entraining can also improve the impermeability of concrete, which is mainly characterized in that after the air entraining agent is added, the triterpenoid saponin reacts to form a large number of closed holes, and a hydrophobic film is formed on the surface of cement particles, thereby reducing the suction effect of capillaries and improving the comprehensive durability of the concrete. Secondly, because a large amount of micro bubbles generated by the air entraining agent are difficult to fill by water, a plurality of uniformly distributed micro spaces exist in the concrete structure, and the micro spaces can be used as 'buffer valves' for volume expansion, so that the concrete damage caused by physical expansion and chemical reaction expansion is reduced and delayed. These properties of air entrained concrete will significantly reduce its segregation and bleeding.
In addition, the section formed when the doped recycled modified PET plastic particles are cut is in the shape of rough ridge, a large number of small and numerous small holes are formed in the section, after the modified PET plastic particles are uniformly stirred with other concrete raw materials, the west sand and the cement can enter the small holes to be fully occluded, and the rough ridge is favorable for increasing the contact area of each component and enabling the bonding to be more compact, so that the concrete disclosed by the invention is not easy to crack, is not easy to bend, is pressure-resistant and impact-resistant, and is good in impermeability.
As shown in Table 2, compared with common concrete, according to the test of the concrete admixture standard GB 8076-1997 and the hydraulic concrete test procedure in China, the concrete of the invention has higher slump (mm), strength (MPa), compressive strength ratio (%) and relative durability index (%) than the standard, and especially when the admixture of the air-entraining agent is 0.025, the concrete of the invention has optimal performance parameters.
Furthermore, the optimal raw material proportion of the concrete is further optimized under the condition of keeping the dosage of the additive, the blending rate of the air entraining agent and the water-to-glue ratio unchanged.
TABLE 3 preparation of recycled concrete at different dosages
Units kg/m in Table 33Is the unit of weight portion of the raw materials needed by the concrete of the invention.
TABLE 4 compression Strength and slump tests of recycled concrete prepared with the amounts of materials in Table 3
The recycled concrete prepared in the mixing ratio shown in table 3 in example 4 above was measured for initial air content and its impermeability by the penetration height method according to test for long-term performance and durability of general concrete GB 50082-2009.
The specific procedure for testing the impermeability according to the conventional osmotic height method is as follows: the test piece is a round table test piece with the top surface diameter of 150mm, the bottom surface diameter of 150mm and the height of 150mm, each group of 8 test pieces is adopted, and the test piece age is 28 d. The test equipment is an HS-40 type concrete permeameter. And (3) splitting the test piece after 24 hours by adopting a one-time pressurization method and constant pressure (1.6MPa), and testing the average water seepage height: and taking the average value of the penetration heights of 10 points at equal intervals of each test piece as the penetration height of the test piece, and taking the average value of the penetration heights of 8 test pieces as a test result. And in the constant pressure process, if the end face of the test piece is seeped, stopping pressurizing and recording the water outlet time. The calculation formula of the permeability coefficient can be expressed as:
SK＝MDm2/2tH
in the formula, SK is relative permeability coefficient (m/s) measured by a penetration depth method;
Dmaverage penetration height (m);
t is the time(s) elapsed for a constant pressure,
m is the water absorption of concrete, and is 0.03 under the general condition;
h is the water pressure (m) expressed in water column height, 1.6Mp corresponds to a water pressure of 163.3m water column height.
The test records are shown in Table 5.
TABLE 5 test results for impermeability
| Numbering | Initial gas content (%) | Penetration height (mm) | 28d Strength (MPa) |
| Group A1 | 2.3 | 22 | 45.2 |
| Group A2 | 2.1 | 25 | 41.6 |
| Group A3 | 2.4 | 23 | 40.5 |
| Group A4 | 2.3 | 24 | 39.6 |
| Group A5 | 2.2 | 26 | 38.8 |
| Group A6 | 2.1 | 21 | 43.1 |
| Group A7 | 2.3 | 27 | 38.5 |
| Group A8 | 2.1 | 23 | 36.2 |
| Group A9 | 2.3 | 26 | 38.1 |
Compared with the test results in Table 5, the minimum penetration height is group A6, the penetration height is only 21mm, the penetration height is group A1, the penetration height is only 22mm, the penetration heights are group A3, group A8, group A4, group A2, group A5, group A9 and group A7, in the test, the penetration heights are all smaller than 30mm within the range of 21-27, and the concrete provided by the invention is relatively strong in penetration resistance and good in permeability resistance.
As shown in tables 3 and 4, the regenerated coarse aggregate content of the a1 test piece was (434 ÷ 1150) x x 100% ═ 37.7%, and the strength was highest in 28 days and the relative durability index was also highest. When the mixing amount of the recycled coarse aggregate of the A6 test piece is (439/1150) x100 percent to 38.2 percent, the indexes of 28-day strength and relative durability are inferior to those of the A1 test piece, and when the water-to-gel ratio is 0.42, the air entraining agent is 0.025 percent of the added mass of the cementing material, and the additive is 6.2kg/m3When the mixing amount of the recycled coarse aggregate is about 38 percent, the 28-day compressive strength of the recycled concrete is the maximum, namely the A1 group is the optimal mixing ratio combination, and the 28-day compressive strength reaches 49.1 MPa. From Table 5, the barrier properties are strongest in group A6 and second in group A1. Thus, the optimum mix ratio of the concrete of the invention is group A1, followed by group A6. Namely, the mixing amount of the recycled coarse aggregate is 37.7 percent, the recycled modified PET plastic particles account for 15.13 percent of the coarse aggregate ratio 174 (174/1150) x100 percent, the water-cement ratio is 0.42, the air entraining agent is 0.025 percent of the added mass of the gelled material, and the additive is 6.2kg/m3In accordance with the inventionAnd (4) optimally proportioning and combining.
In conclusion, the invention can reasonably utilize the construction waste materials, and the problems of poor impermeability and durability of the recycled concrete in the prior art are solved by selecting a reasonable proportion and adding a proper additive and an air entraining agent. The method makes important contributions to solving the environmental problems caused by construction waste, promoting the sustainable utilization of resources and promoting the commercialized application of recycled concrete. According to the invention, part of construction waste such as construction waste concrete and waste bricks is added into the concrete formula, and the waste concrete and the waste bricks are recycled, so that the waste is changed into valuable, the cost is reduced, and the concrete has great environmental benefit, economic benefit and social benefit. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (6)
1. The recycled concrete is characterized by comprising a cementing material, a coarse aggregate, a fine aggregate, an additive, natural river sand, recycled modified PET plastic particles, an air entraining agent and water, wherein the recycled concrete comprises the following materials in parts by weight:
300-470 parts of cementing material
900-1200 parts of coarse aggregate
60-250 parts of fine aggregate
5-8 parts of additive
400-700 parts of natural river sand
125-375 parts of regenerated modified PET plastic particles
The water-to-glue ratio is 0.3-0.45
The air entraining agent is 0.01-0.03 percent of the added mass of the cementing material;
wherein the regenerated modified PET plastic particles are prepared by adding active CaCO into pretreated waste PET chips3Mixing the acrylic resin and the acrylic resin uniformly, adding the mixture into a double-screw extruder, heating, plasticizing and melting the mixture, filtering impurities by using a filter with an effective filtering pore diameter of 200-300 meshes to obtain a melt, discharging the melt from a head sheet material hole or a strip material hole, cooling and granulating the melt to obtain the acrylic resin melt;
wherein the heating temperature is 150-200 ℃, the plasticizing temperature is 260-285 ℃, the melting temperature is 270-300 ℃, the temperature of a die mould of a sheet material hole or a strip material hole in a machine head is 275 ℃, the rotating speed of a double screw is 150rpm, the absolute pressure of an exhaust hole of an extruder is 133Pa, and the material is cut into polyhedral particles with the particle size of 1.5-3.5 mm during granulation;
the waste PET scrap, activated CaCO3The weight portion ratio of the acrylic resin to the acrylic resin is 100:20: 5.
2. The recycled concrete of claim 1, wherein the air entraining agent is composed of the following raw materials in parts by weight: 55 parts of rosin powder, 16 parts of triterpenoid saponin, 12 parts of sodium hydroxide, 9 parts of sulfuric acid, 12 parts of ethylene glycol, 10 parts of bisphenol A, 8 parts of pentaerythritol, 100 parts of water and 16 parts of melamine.
3. The recycled concrete of claim 1, wherein the cementitious material is comprised of the following raw materials in parts by weight: 200-420 parts of cement and 30-150 parts of admixture; wherein the admixture comprises the following raw materials in parts by weight: 30-150 parts of fly ash and 30-90 parts of slag powder.
4. The concrete according to claim 1, wherein: the particle size of the natural river sand is 0.075-4.0 mm.
5. The concrete according to claim 1, wherein: the coarse aggregate comprises, by weight, 200-1000 parts of natural coarse aggregate and 200-840 parts of recycled coarse aggregate, wherein the particle size of the natural coarse aggregate is 7-25 mm, and the particle size of the recycled coarse aggregate is 4.5-20 mm.
6. The concrete according to claim 1, wherein: the particle size of the fine aggregate is 2-4 mm.
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| CN107445550A (en) * | 2017-08-28 | 2017-12-08 | 宿松县尚鼎建材有限公司 | A kind of concrete and preparation method thereof |
| CN107721268B (en) * | 2017-10-21 | 2020-05-19 | 深圳市正强混凝土有限公司 | Concrete formula, regeneration process and regeneration additive thereof |
| CN109928693A (en) * | 2017-12-15 | 2019-06-25 | 姜宏鹏 | A kind of cracking resistance regeneration concrete resistant to high temperature |
| CN108658552A (en) * | 2018-05-24 | 2018-10-16 | 合肥永泰新型建材有限公司 | A kind of regenerated plastics modified concrete and preparation method thereof |
| CN108863202A (en) * | 2018-06-07 | 2018-11-23 | 西安理工大学 | A kind of admixture waste plastic packaging bag regeneration concrete and preparation method thereof |
| CN110713361A (en) * | 2019-11-21 | 2020-01-21 | 柴瑞龙 | High-performance concrete containing recycled aggregate and preparation method thereof |
| CN110885216A (en) * | 2019-12-16 | 2020-03-17 | 西京学院 | Recycled PVC aggregate concrete and preparation method thereof |
| CN111848047A (en) * | 2020-08-03 | 2020-10-30 | 平凉市新世纪建材有限责任公司 | Heat-conducting green recycled concrete |
| CN112250365A (en) * | 2020-10-29 | 2021-01-22 | 怀化明达建材有限公司 | Preparation method of recycled concrete |
| CN112592109B (en) * | 2020-11-26 | 2022-05-13 | 南京博科新材料产业研究院有限公司 | Recycled concrete with excellent performance |
| CN112746608A (en) * | 2021-01-05 | 2021-05-04 | 陕西隆岳地基基础工程有限公司 | Underground continuous wall construction method |
| CN113233825A (en) * | 2021-06-03 | 2021-08-10 | 金华职业技术学院 | Recycled concrete beneficial to improving impermeability and preparation method thereof |
| CN113480217A (en) * | 2021-08-20 | 2021-10-08 | 武汉兴诚海水泥制品有限公司 | Concrete production process for preparing concrete by using construction waste |
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