CN111574149B - Recycled concrete and preparation method thereof - Google Patents
Recycled concrete and preparation method thereof Download PDFInfo
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- CN111574149B CN111574149B CN202010394351.0A CN202010394351A CN111574149B CN 111574149 B CN111574149 B CN 111574149B CN 202010394351 A CN202010394351 A CN 202010394351A CN 111574149 B CN111574149 B CN 111574149B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Aftertreatments Of Artificial And Natural Stones (AREA)
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Abstract
The invention provides novel recycled concrete and a preparation method thereof, which relate to the field of concrete and aim to solve the problems of high porosity and low strength of the existing recycled concrete, and the recycled concrete comprises the following raw materials in parts by weight: 56-88 parts of recycled aggregate, 29-45 parts of new aggregate, 20-35 parts of Portland cement and 15-23 parts of coating agent; 20-36 parts of anti-cracking filler and 84-136 parts of water; the coating agent comprises the following components in parts by weight: 13-25 parts of nano silica sol, 23-36 parts of isopropanol, 15-25 parts of dimethyl carbonate, 3-8 parts of penetrating agent and 16-23 parts of sol coagulant. The invention can effectively fill the micro cracks in the recycled concrete, thereby effectively reducing the porosity of the recycled concrete, improving the compression strength, impermeability and other properties of the recycled concrete, and the preparation method is simple; meanwhile, the use of the recycled concrete accords with the concept of green environmental protection.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to recycled concrete and a preparation method thereof.
Background
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 such as sand stones and the like, and adding cement, water and the like. The recycled concrete effectively reduces the environmental pollution and the damage to the ecological environment.
With the development of recycled concrete, the recycled concrete brings many benefits, and simultaneously has the following problems that the recycled aggregate components comprise a small amount of stones separated from mortar, stones partially wrapping the mortar and a small amount of cement mortar independently forming blocks, so that the porosity of the recycled aggregate is high due to rough surface and more edges and corners of the cement mortar and a large amount of fine cracks in the aggregate during the concrete construction damage and aggregate production process, and further the apparent density and the stacking density of the recycled aggregate are reduced, so that the compressive strength of the concrete is influenced, the water absorption rate of the recycled concrete is too high, and the impermeability is reduced.
Therefore, in order to solve the above problems, the present invention provides a recycled concrete and a method for preparing the same, which can fill cracks in the recycled concrete, thereby improving the compressive strength, impermeability, and the like of the recycled concrete.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the recycled concrete and the preparation method thereof, the invention can effectively fill the micro cracks in the recycled concrete, further effectively reduce the porosity of the recycled concrete, improve the compression strength, impermeability and other properties of the recycled concrete, and the preparation method is simple; meanwhile, the use of the recycled concrete slurry accords with the concept of environmental protection.
The above object of the present invention is achieved by the following technical solutions:
the recycled concrete comprises the following raw materials in parts by weight:
56-88 parts of recycled aggregate, 29-45 parts of new aggregate, 20-35 parts of Portland cement and 15-23 parts of coating agent; 20-36 parts of anti-cracking filler and 84-136 parts of water;
the coating agent comprises the following components in parts by weight: 13-25 parts of nano silica sol, 23-36 parts of isopropanol, 15-25 parts of dimethyl carbonate, 3-8 parts of penetrating agent and 16-23 parts of sol coagulant.
By adopting the technical scheme, the recycled aggregate, the new aggregate and the portland cement are taken as main bodies of recycled concrete; the addition of the coating agent enables the coating agent to coat the surface of the recycled aggregate, so that the coating agent fills tiny cracks of the recycled aggregate; the anti-cracking filler is added into the recycled concrete as a functional additive, so that the anti-cracking performance of the recycled concrete is improved.
When the coating agent is used, the nano silica sol serving as a main crack filler can be uniformly dispersed in isopropanol, and then the isopropanol is uniformly dissolved in dimethyl carbonate, so that the nano silica sol can be uniformly coated on the surface of the recycled aggregate under the action of a solvent consisting of the isopropanol and the dimethyl carbonate; under the action of the penetrant, the nano silica sol gradually penetrates into the cracks of the recycled aggregate along with the isopropanol and the dimethyl carbonate, and then in the hardening process of the recycled concrete, the sol coagulant promotes the nano silica sol to form a high-molecular cross-linked substance with stronger structural strength, so that the cracks of the recycled aggregate can be filled; the porosity of the recycled concrete in the invention is reduced, and the compressive strength, impermeability and other properties of the recycled concrete are effectively improved.
The invention is further set up in that the recycled concrete raw materials comprise the following components in parts by weight:
66-71 parts of recycled aggregate, 32-38 parts of new aggregate, 25-33 parts of Portland cement and 18-20 parts of coating agent; 25-31 parts of anti-cracking filler and 121 parts of water;
the coating agent comprises the following components in parts by weight: 18-20 parts of nano silica sol, 26-28 parts of isopropanol, 19-23 parts of dimethyl carbonate, 4-6 parts of penetrating agent and 18-21 parts of sol coagulant.
By adopting the technical scheme, the content ranges of all components in the recycled concrete are further refined, so that all components in the recycled concrete can be better matched with each other, and the comprehensive performance of the recycled concrete is improved.
The invention is further provided that the penetrant comprises the following components in parts by weight: 16-25 parts of fatty alcohol-polyoxyethylene ether and 14-22 parts of Nippon Sho-BOND crack repair glue.
By adopting the technical scheme, the fatty alcohol-polyoxyethylene ether is a nonionic surfactant, and can effectively reduce the surface tension of a coating agent system, so that the nano silica sol in the coating agent permeates into cracks of the recycled aggregate; the Japanese Schottky SHO-BOND crack repair glue is a molecular resin-based material, the Japanese Schottky SHO-BOND crack repair glue has low viscosity and extremely strong permeability, so that a coating agent system has excellent permeability, and the bonding formation of the Japanese Schottky SHO-BOND crack repair glue is gradually strengthened in the curing process, so that the curing strength of recycled concrete can be further improved.
The invention is further configured that the sol coagulant comprises the following components in parts by weight: 18-31 parts of montmorillonite powder and 3-6 parts of octadecyl trimethyl ammonium chloride.
By adopting the technical scheme, the montmorillonite powder is used as aluminosilicate and has a flaky crystal structure, and in the process of adding water into recycled concrete and stirring, the montmorillonite powder absorbs water to form colloid which is fully mixed with recycled aggregate, and meanwhile, the octadecyl trimethyl ammonium chloride is used as a quaternary ammonium salt surfactant to further improve the dispersibility of the montmorillonite powder; in the curing process of the recycled concrete, montmorillonite powder is dehydrated along with the evaporation of water, isopropanol is taken as a polar molecule and is gradually adsorbed into the montmorillonite powder, so that the nano silica sol is separated from the isopropanol, the nano silica sol can be polymerized to form high-polymer silica gel, the high-polymer silica gel molecules are gradually increased, and finally, a latticed high-polymer cross-linked substance is formed.
The invention is further provided that the anti-crack filler comprises the following components in parts by weight: 15-23 parts of carboxymethyl cellulose, 23-56 parts of glass fiber powder and 18-25 parts of sandstone.
By adopting the technical scheme, the carboxymethyl cellulose can form high-viscosity colloid in the recycled concrete, and has good fluidity, so that the carboxymethyl cellulose is fully dispersed in the recycled concrete, the bonding property among all parts of the recycled concrete is improved, and the crack resistance of the cured recycled concrete is improved; the glass fiber powder is added into the recycled concrete as a filling material, and the hardness and the compressive strength of the recycled concrete can be well enhanced after the recycled concrete is hardened; the sandstone is used for effectively improving the strength and the weathering resistance of the hardened grouting material, so that the use effect of the repaired crack is improved.
The invention is further set up in that the recycled concrete raw materials comprise the following components in parts by weight:
68 parts of recycled aggregate, 35 parts of new aggregate, 29 parts of Portland cement and 19 parts of coating agent; 26 parts of anti-cracking filler and 118 parts of water; the coating agent comprises the following components in parts by weight: 19 parts of nano silica sol, 27 parts of isopropanol, 22 parts of dimethyl carbonate, 5 parts of penetrating agent and 20 parts of sol coagulant;
the penetrant comprises the following components in parts by weight: 23 parts of fatty alcohol-polyoxyethylene ether and 18 parts of Nippon SHO-BOND crack repair glue;
the sol coagulant comprises the following components in parts by weight: 26 parts of montmorillonite powder and 4 parts of octadecyl trimethyl ammonium chloride;
the anti-cracking filler comprises the following components in parts by weight: 20 parts of carboxymethyl cellulose, 36 parts of glass fiber powder and 21 parts of sand.
By adopting the technical scheme, the content of each component in the recycled concrete is further refined, so that each component in the recycled concrete is matched with each other, and the comprehensive performance of the recycled concrete can be effectively improved.
The invention is further provided that the dosage ratio of the sand to the mixed sand of (100-.
Through adopting above-mentioned technical scheme, the grit not only can improve recycled concrete's intensity in sneaking into recycled concrete with different particle size, makes the grit can be in the same place with each composition better in the recycled concrete moreover, improves the closely knit degree after the recycled concrete hardens.
Another object of the present invention is to provide a method for preparing recycled concrete, comprising the steps of:
adding the recycled aggregate, the nano silica sol, the isopropanol, the dimethyl carbonate and the penetrating agent into a stirrer, then adding two thirds of water, and stirring for 6-8 minutes at the rotating speed of 30 revolutions per minute to obtain a first mixed material;
and adding a sol coagulant into the first mixed material, continuously stirring for 2-3 minutes, adding new aggregate, Portland cement, an anti-cracking filler and the rest of water, and continuously stirring for 4-5 minutes to obtain the recycled concrete.
By adopting the technical scheme, the recycled aggregate, the nano silica sol, the isopropanol, the dimethyl carbonate and the penetrating agent are mixed in advance, so that the nano silica sol can fully penetrate into gaps of the recycled aggregate; then adding a sol coagulant to ensure that the sol coagulant can be fully coated on the surfaces of the particles of the first mixed material, thereby being beneficial to the adsorption of the montmorillonite powder on the isopropanol in the later period; and finally, adding the rest raw materials into the first mixed material and mixing to obtain the recycled concrete of the invention.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the method takes the recycled aggregate, the new aggregate and the silicate cement as the main body of the recycled concrete, simultaneously, the nano silica sol in the coating agent is uniformly coated on the surface of the recycled aggregate under the action of a solvent consisting of isopropanol and dimethyl carbonate, then under the action of a penetrating agent, the nano silica sol gradually penetrates into cracks of the recycled aggregate along with the isopropanol and the dimethyl carbonate, and finally, in the hardening process of the recycled concrete, the sol coagulant promotes the nano silica sol to form a high-molecular cross-linked substance with stronger structural strength, so that the cracks of the recycled aggregate can be filled; the porosity of the recycled concrete in the invention is reduced, and the compressive strength, impermeability and other properties of the recycled concrete are effectively improved;
2. in the sol coagulant, in the process of adding water and stirring recycled concrete, montmorillonite powder absorbs water to form colloid which is fully mixed with recycled aggregate, in the process of curing the recycled concrete, the montmorillonite powder is dehydrated along with the evaporation of water, and the montmorillonite powder starts to adsorb isopropanol, so that nano silica sol is separated from the isopropanol, the nano silica sol can be polymerized to form high-polymer silica sol, the molecules of the high-polymer silica sol are gradually increased, and finally, a latticed high-polymer cross-linked substance is formed;
3. in the process of preparing the recycled concrete, the specific charging sequence is utilized, so that the nano silica sol can fully permeate into gaps of recycled aggregate, and the montmorillonite powder can fully adsorb isopropanol, so that the micro cracks in the recycled concrete can be effectively filled, the porosity of the recycled concrete is effectively reduced, the compressive strength, the impermeability and other properties of the recycled concrete are improved, and the preparation method is simple; meanwhile, the use of the recycled concrete slurry accords with the concept of environmental protection.
Detailed Description
The present invention will be described in further detail with reference to examples.
The first embodiment is as follows:
the recycled concrete comprises the following raw materials in parts by weight:
56 parts of recycled aggregate, 29 parts of new aggregate, 20 parts of Portland cement and 23 parts of coating agent; 20 parts of anti-crack filler and 84 parts of water.
Wherein:
the new aggregate is basalt broken stone and common river sand in equal weight parts; the basalt broken stone has the grain size of 5-25mm and is continuously graded; the fineness modulus of the common river sand is 2.6, and the apparent density is 2670kg/m 3; the particle size of the recycled aggregate is 20 mm.
The anti-cracking filler comprises the following components in parts by weight: 15 parts of carboxymethyl cellulose, 23 parts of glass fiber powder and 18 parts of sandstone; the sand is mixed sand of 100 meshes and 210 meshes, and the dosage ratio of the sand of 100 meshes to the sand of 210 meshes is 5: 1.
The coating agent comprises the following components in parts by weight: 13 parts of nano silica sol, 23 parts of isopropanol, 15 parts of dimethyl carbonate, 3 parts of penetrating agent and 16 parts of sol coagulant.
In the coating agent:
the penetrant comprises the following components in parts by weight: 16 parts of fatty alcohol-polyoxyethylene ether and 16 parts of Nippon SHO-BOND crack repairing glue.
The sol coagulant comprises the following components in parts by weight: montmorillonite powder 25 parts and octadecyl trimethyl ammonium chloride 4 parts.
The preparation method of the recycled concrete comprises the following steps:
adding the recycled aggregate, the nano silica sol, the isopropanol, the dimethyl carbonate and the penetrating agent into a stirrer, then adding two thirds of water, and stirring for 6 minutes at the rotating speed of 30 revolutions per minute to obtain a first mixed material;
and adding a sol coagulant into the first mixed material, continuously stirring for 2 minutes, adding new aggregate, Portland cement, an anti-cracking filler and the rest of water, and continuously stirring for 4 minutes to obtain the recycled concrete.
Example two:
the recycled concrete comprises the following raw materials in parts by weight:
66 parts of recycled aggregate, 38 parts of new aggregate, 25 parts of Portland cement and 20 parts of coating agent; 25 parts of anti-cracking filler and 121 parts of water.
Wherein:
the new aggregate is basalt broken stone and common river sand in equal weight parts; the basalt broken stone has the grain size of 5-25mm and is continuously graded; the fineness modulus of the common river sand is 2.6, and the apparent density is 2670kg/m 3; the particle size of the recycled aggregate is 20 mm.
The anti-cracking filler comprises the following components in parts by weight: 15 parts of carboxymethyl cellulose, 23 parts of glass fiber powder and 25 parts of sandstone; the dosage ratio of 120-mesh sand to 250-mesh sand is (5-7): 1.
The coating agent comprises the following components in parts by weight: 18 parts of nano silica sol, 28 parts of isopropanol, 19 parts of dimethyl carbonate, 6 parts of penetrating agent and 18 parts of sol coagulant.
In the coating agent:
the penetrant comprises the following components in parts by weight: 18 parts of fatty alcohol-polyoxyethylene ether and 14 parts of Nippon SHO-BOND crack repairing glue.
The sol coagulant comprises the following components in parts by weight: montmorillonite powder 18 parts and octadecyl trimethyl ammonium chloride 3 parts.
The preparation method of the recycled concrete comprises the following steps:
adding the recycled aggregate, the nano silica sol, the isopropanol, the dimethyl carbonate and the penetrating agent into a stirrer, then adding two thirds of water, and stirring for 7 minutes at the rotating speed of 30 revolutions per minute to obtain a first mixed material;
and adding a sol coagulant into the first mixed material, continuously stirring for 2 minutes, adding new aggregate, Portland cement, an anti-cracking filler and the rest of water, and continuously stirring for 5 minutes to obtain the recycled concrete.
Example three:
the recycled concrete comprises the following raw materials in parts by weight:
the raw materials comprise the following components in parts by weight:
68 parts of recycled aggregate, 35 parts of new aggregate, 29 parts of Portland cement and 19 parts of coating agent; 26 parts of anti-cracking filler and 118 parts of water.
Wherein:
the new aggregate is basalt broken stone and common river sand in equal weight parts; the basalt broken stone has the grain size of 5-25mm and is continuously graded; the fineness modulus of the common river sand is 2.6, and the apparent density is 2670kg/m 3; the particle size of the recycled aggregate is 20 mm.
The anti-cracking filler comprises the following components in parts by weight: 20 parts of carboxymethyl cellulose, 36 parts of glass fiber powder and 21 parts of sandstone; the dosage ratio of the sand to be mixed is 6:1, wherein the sand to be mixed is 110 meshes and 260 meshes.
The coating agent comprises the following components in parts by weight: 19 parts of nano silica sol, 27 parts of isopropanol, 22 parts of dimethyl carbonate, 5 parts of penetrating agent and 20 parts of sol coagulant.
In the coating agent:
the penetrant comprises the following components in parts by weight: 23 parts of fatty alcohol-polyoxyethylene ether and 18 parts of Nippon SHO-BOND crack repair glue.
The sol coagulant comprises the following components in parts by weight: 26 parts of montmorillonite powder and 4 parts of octadecyl trimethyl ammonium chloride.
The preparation method of the recycled concrete comprises the following steps:
adding the recycled aggregate, the nano silica sol, the isopropanol, the dimethyl carbonate and the penetrating agent into a stirrer, then adding two thirds of water, and stirring for 7 minutes at the rotating speed of 30 revolutions per minute to obtain a first mixed material;
and adding a sol coagulant into the first mixed material, continuously stirring for 3 minutes, adding new aggregate, Portland cement, an anti-cracking filler and the rest of water, and continuously stirring for 4 minutes to obtain the recycled concrete.
Example four:
the recycled concrete comprises the following raw materials in parts by weight:
71 parts of recycled aggregate, 32 parts of new aggregate, 33 parts of portland cement and 18 parts of coating agent; 31 parts of anti-cracking filler and 100 parts of water.
Wherein:
the new aggregate is basalt broken stone and common river sand in equal weight parts; the basalt broken stone has the grain size of 5-25mm and is continuously graded; the fineness modulus of the common river sand is 2.6, and the apparent density is 2670kg/m 3; the particle size of the recycled aggregate is 20 mm.
The anti-cracking filler comprises the following components in parts by weight: 23 parts of carboxymethyl cellulose, 23-56 parts of glass fiber powder and 18 parts of sandstone; the sand and stone are mixed sand and stone of 120 meshes and 300 meshes, and the dosage ratio of the sand and stone of 120 meshes to the sand and stone of 300 meshes is 7: 1.
The coating agent comprises the following components in parts by weight: 20 parts of nano silica sol, 26 parts of isopropanol, 23 parts of dimethyl carbonate, 4 parts of penetrating agent and 21 parts of sol coagulant.
In the coating agent:
the penetrant comprises the following components in parts by weight: 25 parts of fatty alcohol-polyoxyethylene ether and 22 parts of Nippon SHO-BOND crack repair glue.
The sol coagulant comprises the following components in parts by weight: 31 parts of montmorillonite powder and 6 parts of octadecyl trimethyl ammonium chloride.
The preparation method of the recycled concrete comprises the following steps:
adding the recycled aggregate, the nano silica sol, the isopropanol, the dimethyl carbonate and the penetrating agent into a stirrer, then adding two thirds of water, and stirring for 8 minutes at the rotating speed of 30 revolutions per minute to obtain a first mixed material;
and adding a sol coagulant into the first mixed material, continuously stirring for 3 minutes, adding new aggregate, Portland cement, an anti-cracking filler and the rest of water, and continuously stirring for 5 minutes to obtain the recycled concrete.
Example five:
the recycled concrete comprises the following raw materials in parts by weight:
88 parts of recycled aggregate, 45 parts of new aggregate, 5 parts of portland cement and 15 parts of coating agent; 36 parts of anti-cracking filler and 136 parts of water.
Wherein:
the new aggregate is basalt broken stone and common river sand in equal weight parts; the basalt broken stone has the grain size of 5-25mm and is continuously graded; the fineness modulus of the common river sand is 2.6, and the apparent density is 2670kg/m 3; the particle size of the recycled aggregate is 20 mm.
The anti-cracking filler comprises the following components in parts by weight: 23 parts of carboxymethyl cellulose, 23-56 parts of glass fiber powder and 25 parts of sandstone; the dosage ratio of the 120-mesh sand to the 290-mesh sand is 6: 1.
The coating agent comprises the following components in parts by weight: 25 parts of nano silica sol, 36 parts of isopropanol, 25 parts of dimethyl carbonate, 8 parts of penetrating agent and 23 parts of sol coagulant.
In the coating agent:
the penetrant comprises the following components in parts by weight: 25 parts of fatty alcohol-polyoxyethylene ether and 22 parts of Nippon SHO-BOND crack repair glue.
The sol coagulant comprises the following components in parts by weight: 31 parts of montmorillonite powder and 6 parts of octadecyl trimethyl ammonium chloride.
The preparation method of the recycled concrete comprises the following steps:
adding the recycled aggregate, the nano silica sol, the isopropanol, the dimethyl carbonate and the penetrating agent into a stirrer, then adding two thirds of water, and stirring for 8 minutes at the rotating speed of 30 revolutions per minute to obtain a first mixed material;
and adding a sol coagulant into the first mixed material, continuously stirring for 3 minutes, adding new aggregate, Portland cement, an anti-cracking filler and the rest of water, and continuously stirring for 4 minutes to obtain the recycled concrete.
Comparative example one:
compared with the first embodiment, the preparation method of the recycled concrete is that all raw materials are mixed at one time and stirred for 12 minutes at the rotating speed of 30 revolutions per minute.
Comparative example two:
in contrast to example one, no capping agent was added.
Comparative example three:
in contrast to example one, no isopropanol was added.
Comparative example four:
in contrast to example one, no penetrant was added.
Comparative example five:
in contrast to example one, no sol coagulant was added.
Comparative example six:
compared with example one, the montmorillonite powder was replaced with an equal amount of bentonite (product number P001 of Jingpeng mineral processing factory, Lingshui county).
And (3) performance detection:
and (3) carrying out relevant performance detection on the recycled concrete prepared in the first to fifth examples and the first to sixth comparative examples.
Resistance to chloride ion permeation: according to GB/T50082-2009 test method standards for long-term performance and durability of common concrete, the chloride ion penetration depth of a standard test block is tested by a rapid chloride ion migration coefficient method.
Water penetration resistance: and (3) testing the water seepage depth of the standard test block by a step-by-step pressurization method according to GB/T50082-2009 standard of test methods for long-term performance and durability of common concrete.
The freezing resistance performance is as follows: the frost resistance of the concrete is measured according to GB/T50082-2009 test method standards for the long-term performance and the durability of the common concrete, and the frost resistance is evaluated by testing with a slow freezing method and the maximum freezing-thawing cycle times.
Compressive strength: and (3) manufacturing a standard test block according to GB/T50081-2002 standard of the test method for the mechanical properties of the common concrete, and measuring the compressive strength of the standard test block after 1d, 7d and 28d of maintenance.
And (3) detecting porosity: preparing the mortar into a standard block, curing for 28 days, measuring the natural volume V1 of the standard block, grinding the standard block into powder, and measuring the volume V2 of the powder by a drainage method, wherein the porosity is (V1-V2)/V1.
TABLE 1
TABLE 2
According to the detection result, the recycled concrete prepared by the method has lower porosity, and the performances of the recycled concrete such as compressive strength, impermeability and the like are effectively improved; the addition of the coating agent greatly reduces the porosity of the recycled concrete; the combination of montmorillonite powder and isopropanol effectively promotes the coagulation of nano silica gel and improves the strength of recycled concrete; meanwhile, in the process of preparing the recycled concrete, the nano silica sol can fully permeate into gaps of recycled aggregate and montmorillonite powder can fully adsorb isopropanol by using a specific feeding sequence, so that the micro cracks in the recycled concrete can be effectively filled, the porosity of the recycled concrete is effectively reduced, and the performances of the recycled concrete, such as compressive strength, impermeability and the like, are improved.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (6)
1. The recycled concrete is characterized by comprising the following raw materials in parts by weight:
56-88 parts of recycled aggregate, 29-45 parts of new aggregate, 20-35 parts of Portland cement and 15-23 parts of coating agent; 20-36 parts of anti-cracking filler and 84-136 parts of water;
the coating agent comprises the following components in parts by weight: 13-25 parts of nano silica sol, 23-36 parts of isopropanol, 15-25 parts of dimethyl carbonate, 3-8 parts of penetrating agent and 16-23 parts of sol coagulant;
the penetrant comprises the following components in parts by weight: 16-25 parts of fatty alcohol-polyoxyethylene ether and 14-22 parts of Nippon Sho-BOND crack repair glue;
the sol coagulant comprises the following components in parts by weight: 18-31 parts of montmorillonite powder and 3-6 parts of octadecyl trimethyl ammonium chloride.
2. The recycled concrete of claim 1, wherein the raw materials comprise the following components in parts by weight:
66-71 parts of recycled aggregate, 32-38 parts of new aggregate, 25-33 parts of Portland cement and 18-20 parts of coating agent; 25-31 parts of anti-cracking filler and 121 parts of water;
the coating agent comprises the following components in parts by weight: 18-20 parts of nano silica sol, 26-28 parts of isopropanol, 19-23 parts of dimethyl carbonate, 4-6 parts of penetrating agent and 18-21 parts of sol coagulant.
3. A recycled concrete as claimed in claim 2, wherein: the anti-cracking filler comprises the following components in parts by weight: 15-23 parts of carboxymethyl cellulose, 23-56 parts of glass fiber powder and 18-25 parts of sandstone.
4. The recycled concrete of claim 3, wherein the raw materials comprise the following components in parts by weight:
68 parts of recycled aggregate, 35 parts of new aggregate, 29 parts of Portland cement and 19 parts of coating agent; 26 parts of anti-cracking filler and 118 parts of water;
the coating agent comprises the following components in parts by weight: 19 parts of nano silica sol, 27 parts of isopropanol, 22 parts of dimethyl carbonate, 5 parts of penetrating agent and 20 parts of sol coagulant;
the penetrant comprises the following components in parts by weight: 23 parts of fatty alcohol-polyoxyethylene ether and 18 parts of Nippon SHO-BOND crack repair glue;
the sol coagulant comprises the following components in parts by weight: 26 parts of montmorillonite powder and 4 parts of octadecyl trimethyl ammonium chloride;
the anti-cracking filler comprises the following components in parts by weight: 20 parts of carboxymethyl cellulose, 36 parts of glass fiber powder and 21 parts of sand.
5. A recycled concrete as claimed in claim 4, wherein: the sand is mixed sand of 100-order 120 meshes and 210-order 300 meshes, and the dosage ratio of the sand of 100-order 120 meshes to the sand of 210-order 300 meshes is 5-7: 1.
6. The method for the preparation of recycled concrete according to any one of claims 1 to 5, characterized by comprising the following steps:
adding the recycled aggregate, the nano silica sol, the isopropanol, the dimethyl carbonate and the penetrating agent into a stirrer, then adding two thirds of water, and stirring for 6-8 minutes at the rotating speed of 30 revolutions per minute to obtain a first mixed material;
and adding a sol coagulant into the first mixed material, continuously stirring for 2-3 minutes, adding new aggregate, Portland cement, an anti-cracking filler and the rest of water, and continuously stirring for 4-5 minutes to obtain the recycled concrete.
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| CN113321470B (en) * | 2021-06-11 | 2023-03-17 | 佛冈县诚康商品混凝土有限公司 | High-strength recycled concrete and preparation method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6348093B1 (en) * | 2000-04-27 | 2002-02-19 | W. R. Grace & Co. - Conn | Basic-medium-soluble packaging material for use in castable cementitious composites |
| CN1935736A (en) * | 2006-10-21 | 2007-03-28 | 杨金平 | Phosphogypsum high-strength wall brick and its production method |
| KR20110093971A (en) * | 2011-07-13 | 2011-08-19 | 이재환 | High compression nano coating compositions |
| CN107265898A (en) * | 2017-06-22 | 2017-10-20 | 合肥易美特建材有限公司 | A kind of compound insulating material and preparation method |
| CN109456003A (en) * | 2018-12-08 | 2019-03-12 | 曙光装配式建筑科技（浙江）有限公司 | A kind of impervious regeneration concrete and preparation method thereof |
| CN110776290A (en) * | 2019-10-23 | 2020-02-11 | 广东工业大学 | Rubber recycled concrete and preparation method thereof |
| CN111362638A (en) * | 2020-03-13 | 2020-07-03 | 深圳市金得益建材有限公司 | Novel recycled concrete mortar and preparation method thereof |
| CN111592288A (en) * | 2020-05-25 | 2020-08-28 | 四川仁寿晟兴商砼有限公司 | Preparation process of recycled aggregate concrete and concrete prepared by preparation process |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111533525B (en) * | 2020-05-09 | 2020-12-11 | 南京天亚新材料有限公司 | Grouting material special for bridge restoration |
| CN111592324B (en) * | 2020-05-23 | 2022-03-18 | 杭州汉特建材有限公司 | Concrete and preparation method thereof |
-
2020
- 2020-05-11 CN CN202010394351.0A patent/CN111574149B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6348093B1 (en) * | 2000-04-27 | 2002-02-19 | W. R. Grace & Co. - Conn | Basic-medium-soluble packaging material for use in castable cementitious composites |
| CN1935736A (en) * | 2006-10-21 | 2007-03-28 | 杨金平 | Phosphogypsum high-strength wall brick and its production method |
| KR20110093971A (en) * | 2011-07-13 | 2011-08-19 | 이재환 | High compression nano coating compositions |
| CN107265898A (en) * | 2017-06-22 | 2017-10-20 | 合肥易美特建材有限公司 | A kind of compound insulating material and preparation method |
| CN109456003A (en) * | 2018-12-08 | 2019-03-12 | 曙光装配式建筑科技（浙江）有限公司 | A kind of impervious regeneration concrete and preparation method thereof |
| CN110776290A (en) * | 2019-10-23 | 2020-02-11 | 广东工业大学 | Rubber recycled concrete and preparation method thereof |
| CN111362638A (en) * | 2020-03-13 | 2020-07-03 | 深圳市金得益建材有限公司 | Novel recycled concrete mortar and preparation method thereof |
| CN111592288A (en) * | 2020-05-25 | 2020-08-28 | 四川仁寿晟兴商砼有限公司 | Preparation process of recycled aggregate concrete and concrete prepared by preparation process |
Non-Patent Citations (2)
| Title |
|---|
| 含镉废水废渣的处理技术及动向;张大力等;《环境保护》;19940525(第05期);10-12 * |
| 钛交联蒙脱石复合材料的制备与表征;刘涛等;《非金属矿》;20110120;第34卷(第1期);47-49 * |
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