CN114702282A - Sound absorption and noise reduction concrete - Google Patents
Sound absorption and noise reduction concrete Download PDFInfo
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- CN114702282A CN114702282A CN202210406422.3A CN202210406422A CN114702282A CN 114702282 A CN114702282 A CN 114702282A CN 202210406422 A CN202210406422 A CN 202210406422A CN 114702282 A CN114702282 A CN 114702282A
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
- C04B2111/52—Sound-insulating 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
-
- 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
Abstract
The invention discloses sound absorption and noise reduction concrete, and relates to the technical field of building materials. When the sound absorption and noise reduction concrete is prepared, modified polypropylene fibers are added into cement to prepare the sound absorption and noise reduction concrete, the modified polypropylene fibers are prepared by grafting polycarboxylic acid water reducing agent blanks on polypropylene fine fibers subjected to plasma treatment, grafting methanesulfonyl chloride-substituted polyethylene glycol monomethyl ether on the polycarboxylic acid water reducing agent blanks, and finally performing plasma treatment, wherein the polycarboxylic acid water reducing agent blanks are prepared by copolymerizing acrylic acid, polyethylene glycol methyl methacrylate and sodium allylsulfonate; the sound absorption and noise reduction concrete prepared by the invention has sound absorption and noise reduction performance, and meanwhile, the dispersibility and the fluidity are good, and the toughness and the crack resistance at the later hardening stage are high.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to sound absorption and noise reduction concrete.
Background
The building material is a material foundation of building engineering, and various materials are needed in the construction from a main body structure to decoration and fitment. Noise has become a major environmental pollution, and the sound environment problem of buildings is receiving more and more attention and attention. The selection of proper materials for sound absorption and sound insulation treatment of buildings is one of the most common and basic technical measures in the building noise control project.
At present, most of sound absorption and noise reduction concrete focuses on adding glass beads or lightweight aggregate to enhance the sound absorption performance of the concrete, so that the sound absorption and noise reduction performance is enhanced, but the sound absorption and noise reduction performance still affects the performance of the concrete. The invention aims to enhance the performance of sound absorption and noise reduction without influencing the performance of concrete and improve other performances of the concrete.
Disclosure of Invention
The invention aims to provide sound absorption and noise reduction concrete and a preparation method thereof, so as to solve the problems in the background technology.
The sound absorption and noise reduction concrete is characterized by mainly comprising the following raw material components in parts by weight: 0-60 parts of cement, 4-6 parts of modified polypropylene fiber, 4-12 parts of fine sand and 25-60 parts of tap water.
Preferably, the modified polypropylene fiber is prepared by grafting a polycarboxylate superplasticizer blank on the polypropylene fine fiber subjected to plasma treatment, grafting methanesulfonyl chloride-substituted polyethylene glycol monomethyl ether on the polycarboxylate superplasticizer blank, and finally performing plasma treatment.
Preferably, the polycarboxylate superplasticizer blank is prepared by copolymerizing acrylic acid, polyethylene glycol methyl methacrylate and sodium allylsulfonate.
Preferably, the fine sand is screened by a 60-target standard mesh screen, and the mud content is less than 99%; the cement is portland cement.
Preferably, the preparation method of the sound absorption and noise reduction concrete comprises the following steps: pretreating polypropylene fine fibers, preparing a polycarboxylate superplasticizer blank, preparing methanesulfonyl chloride substituted polyethylene glycol monomethyl ether, preparing modified polypropylene fibers, and preparing sound-absorbing and noise-reducing concrete.
Preferably, the preparation method of the sound absorption and noise reduction concrete comprises the following specific steps:
(1) carrying out plasma treatment on the polypropylene fine fiber, wherein the power is 80W, the vacuum degree is 30Pa, and the treatment time is 30-60 s, so as to prepare the pretreated polypropylene fine fiber;
(2) adding 20-30% by mass of sodium allylsulfonate solution into a flask, introducing nitrogen into the flask, heating in a water bath to 70-80 ℃, then sequentially dropwise adding 0.08-0.1 time of the mass of the sodium allylsulfonate solution and 5-10% by mass of ammonium persulfate solution and 0.3-0.5 time of the mass of the sodium allylsulfonate solution, continuing to react for 2-3 h after dropwise adding is finished, and adjusting the pH to 6-7 by using 20% by mass of sodium hydroxide solution to prepare a polycarboxylic acid water reducer blank;
(3) placing polyethylene glycol monomethyl ether in a round-bottom flask, adding dichloromethane, ethylenediamine and methylsulfonyl chloride in a nitrogen atmosphere, reacting for 6 hours at room temperature, dropwise adding concentrated sulfuric acid with the mass fraction of 98% which is 0.01-0.02 times of that of the polyethylene glycol monomethyl ether into the system at the dropping speed of 10 drops/min, uniformly stirring, adjusting the pH value to 7 by using a saturated aqueous solution of sodium bicarbonate, and extracting and purifying to obtain a polyethylene glycol monomethyl ether blank; dispersing a polyethylene glycol monomethyl ether blank in deionized water, stirring uniformly, standing until layering is achieved, taking an upper layer liquid as the polyethylene glycol monomethyl ether blank after liquid separation, dispersing in the deionized water, stirring uniformly, standing until layering is achieved, taking the upper layer liquid after liquid separation, adding anhydrous sodium sulfate, filtering after 10min, evaporating by using a rotary evaporator until no gas escapes, wherein the evaporation temperature is 40-50 ℃, and preparing methanesulfonyl chloride substituted polyethylene glycol monomethyl ether;
(4) transferring a polypropylene fiber blank into a beaker, adding methanesulfonyl chloride-substituted polyethylene glycol monomethyl ether with the mass of 0.3-0.5 time of that of the polypropylene fiber blank and tetrahydrofuran with the mass of 5-8 times of that of the polypropylene fiber blank, stirring at the constant temperature of 800-1200 rpm for 5-8 h at the temperature of 40-50 ℃, taking out, drying to constant weight, performing plasma treatment with the power of 80W, the vacuum degree of 30Pa and the treatment time of 30-60 s to prepare the modified polypropylene fiber;
(5) mixing the modified polypropylene fiber, cement with the mass of 10-15 times that of the modified polypropylene fiber and fine sand with the mass of 1-2 times that of the modified polypropylene fiber, adding tap water with the mass of 5-10 times that of the modified polypropylene fiber, and stirring under a vertical stirrer to prepare concrete slurry; pouring the concrete slurry into a mould, covering the surface of the mould with a red copper net with the aperture of 80 meshes, and taking out the concrete slurry after the concrete slurry is hardened to obtain the sound absorption and noise reduction concrete.
Preferably, in the step (2): the amount of the introduced nitrogen is 3-5 times of the volume of the sodium allylsulfonate solution; the dropping speed of the ammonium persulfate solution is 10 drops/min; the rate of dropping polyethylene glycol methyl methacrylate was 30 drops/min.
Preferably, in the step (3): the mass ratio of polyethylene glycol monomethyl ether, dichloromethane, ethylenediamine and methylsulfonyl chloride is 10: 2: 3: 4; the mass ratio of the polyethylene glycol monomethyl ether blank to the deionized water to the anhydrous sodium sulfate is 1: 5: 0.5-1: 8: 0.5.
preferably, in the step (4): the preparation method of the polypropylene fiber blank comprises the following steps: the pretreated polypropylene fine fiber and the polycarboxylate superplasticizer blank are mixed according to the mass ratio of 3: 1, mixing, dropwise adding 98% concentrated sulfuric acid which is 0.01-0.02 times of the mass of the polycarboxylate superplasticizer blank at a dropping rate of 10 drops/min, uniformly stirring, standing for 24 hours, and adjusting the pH to 6-7 by using 20% sodium hydroxide solution to obtain the polypropylene fiber blank.
Preferably, in the step (5): the stirring speed is 100-200 rpm, and the time is 1 h.
Compared with the prior art, the invention has the following beneficial effects:
when the sound absorption and noise reduction concrete is prepared, modified polypropylene fibers are added into cement to prepare the sound absorption and noise reduction concrete, the modified polypropylene fibers are prepared by grafting a polycarboxylate superplasticizer blank on polypropylene fine fibers subjected to plasma treatment, grafting methanesulfonyl chloride substituted polyethylene glycol monomethyl ether on the polycarboxylate superplasticizer blank, and finally performing plasma treatment, wherein the polycarboxylate superplasticizer blank is prepared by copolymerizing acrylic acid, polyethylene glycol methyl methacrylate and sodium allylsulfonate;
peroxide groups, carbonyl groups, carboxyl groups and other active groups are introduced to the surface of the polypropylene fine fiber after the polypropylene fine fiber is subjected to plasma treatment, the polypropylene fine fiber can be subjected to a crosslinking reaction with a polycarboxylate water reducer blank with a comb-type molecular structure, the polypropylene fine fiber is inserted into the surface of the polypropylene fine fiber, pits on the surface of the fiber after the plasma treatment are sealed to form a fine cavity, and the sound absorption performance of concrete is improved after cement is added; grafting methanesulfonyl chloride substituted polyethylene glycol monomethyl ether on the polycarboxylic acid water reducing agent to increase a side chain, changing the water reducing agent with the original comb-shaped molecular structure into a cross-shaped molecular structure while improving the hydrophilicity, and crosslinking and entangling the increased side chain with the polypropylene fine fiber again to increase the diameter of the modified polypropylene fiber to prepare the modified polypropylene fiber with the surface entangled with the carboxylic acid water reducing agent and between the polypropylene coarse fiber and the polypropylene fine fiber;
the modified polypropylene fiber is adsorbed on the surface of cement particles, because of the existence of polar hydrophilic groups on a polycarboxylic acid water reducing agent, a hydrogen bond is formed between the contact surface of the cement particles and the modified polypropylene fiber and water, a hydration film is formed, polar carboxyl ions and hydroxyl groups on side chains have negative charges, and the polar carboxyl ions and the hydroxyl groups repel each other with the same polarity of the cement particles, so that the cement particles are dispersed to a certain extent, the dispersibility of the cement is improved, because of the good water solubility of polyethylene glycol monomethyl ether, the modified polypropylene fiber can be well dispersed in the hydrated cement, the hydrophilic groups on the modified polypropylene fiber can play a role in adsorbing and wetting the cement particles, the flocculation process of the cement is further destroyed, and the lipophilic groups can be distributed around the cement particles, so that the steric hindrance effect is generated among the cement particles, and the flowing property of the cement is improved;
and then carrying out plasma treatment on the polypropylene fine fibers entangled with the carboxylic acid water reducing agent to enable active groups to be generated at gaps between the carboxylic acid water reducing agent and the polypropylene fine fibers, converting calcium oxide in cement into calcium carbonate during hydration, enabling the calcium carbonate to react with the active groups generated at the gaps, enabling calcium ions in cement slurry to interact with carboxylate radicals in molecules of the polycarboxylic acid water reducing agent to generate a calcium coordination complex, reducing the concentration of the calcium ions in a liquid phase, enabling the cement to be more tightly combined with the modified polypropylene fibers, improving the microscopic structure in concrete, and further enhancing the toughness and crack resistance of the concrete at the later hardening stage.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to more clearly illustrate the method provided by the present invention, the following examples are used to describe the method for testing each index of the sound absorption and noise reduction concrete made in the following examples as follows:
sound absorption: standing wave tube sound absorption tests are carried out on the sound absorption and noise reduction concrete prepared in the examples 1 and 2 and the comparative examples 1, 2 and 3 at the frequencies of 0.5k and 1k, and the sound absorption coefficients are measured and compared.
Compressive strength and cleavage strength: and (3) detecting the compression strength and the splitting strength of the sound absorption and noise reduction concrete rows prepared in the examples 1 and 2 and the comparative examples 1, 2 and 3.
Example 1
The sound absorption and noise reduction concrete mainly comprises the following components in parts by weight:
50 parts of cement, 4 parts of modified polypropylene fiber, 4 parts of fine sand and 25 parts of tap water.
A preparation method of sound absorption and noise reduction concrete comprises the following steps:
(1) carrying out plasma treatment on the polypropylene fine fiber, wherein the power is 80W, the vacuum degree is 30Pa, and the treatment time is 30s, so as to prepare the pretreated polypropylene fine fiber;
(2) adding 20% by mass of sodium allylsulfonate solution into a flask, introducing 3 times of nitrogen by volume of the sodium allylsulfonate solution into the flask, heating in a water bath to 70 ℃, then sequentially dropwise adding 0.08% by mass of the sodium allylsulfonate solution and 5% by mass of ammonium persulfate solution and 0.3 times by mass of the sodium allylsulfonate solution of polyethylene glycol methyl methacrylate, wherein the dropwise adding rate of the ammonium persulfate solution is 10 drops/min, the dropwise adding rate of the polyethylene glycol methyl methacrylate is 30 drops/min, continuing to react for 2h after the dropwise adding is finished, and adjusting the pH to 6.5 by using 20% by mass of sodium hydroxide solution to prepare a polycarboxylic acid water reducer blank;
(3) placing polyethylene glycol monomethyl ether into a round-bottom flask, adding dichloromethane, ethylenediamine and methylsulfonyl chloride under the nitrogen atmosphere, wherein the mass ratio of the polyethylene glycol monomethyl ether to the dichloromethane to the ethylenediamine to the methylsulfonyl chloride is 10: 2: 3: 4, reacting at room temperature for 6 hours, then dropwise adding concentrated sulfuric acid with the mass fraction of 98 percent, which is 0.01 time of that of the polyethylene glycol monomethyl ether, into the system at the dropping speed of 10 drops/min, uniformly stirring, adjusting the pH value to 7 by using a saturated aqueous solution of sodium bicarbonate, and extracting and purifying to obtain a polyethylene glycol monomethyl ether blank; dispersing a polyethylene glycol monomethyl ether blank in deionized water, stirring uniformly, standing until layering, taking upper-layer liquid as the polyethylene glycol monomethyl ether blank after liquid separation, dispersing in the deionized water, stirring uniformly, standing until layering, taking upper-layer liquid after liquid separation, adding anhydrous sodium sulfate, filtering after 10min, wherein the mass ratio of the polyethylene glycol monomethyl ether blank to the deionized water to the anhydrous sodium sulfate is 1: 5: 0.5, evaporating by using a rotary evaporator until no gas escapes, wherein the evaporation temperature is 40 ℃, and preparing methanesulfonyl chloride substituted polyethylene glycol monomethyl ether;
(4) the pretreated polypropylene fine fiber and the polycarboxylate superplasticizer blank are mixed according to the mass ratio of 3: 1, mixing, dropwise adding 98% concentrated sulfuric acid which is 0.01 time of the mass of the polycarboxylate superplasticizer blank at a dropping rate of 10 drops/min, uniformly stirring, standing for 24 hours, and adjusting the pH to 6 by using 20% sodium hydroxide solution to obtain a polypropylene fiber blank; transferring a polypropylene fiber blank into a beaker, adding methanesulfonyl chloride-substituted polyethylene glycol monomethyl ether with the mass 0.3 time that of the polypropylene fiber blank and tetrahydrofuran with the mass 5 times that of the polypropylene fiber blank, stirring at the constant temperature of 40 ℃ at the rotating speed of 800rpm for 5h, taking out, drying to constant weight, performing plasma treatment with the power of 80W, the vacuum degree of 30Pa and the treatment time of 30s to obtain the modified polypropylene fiber;
(5) mixing modified polypropylene fibers and cement which is 10 times of the mass of the modified polypropylene fibers with fine sand which is 1 time of the mass of the modified polypropylene fibers, adding tap water which is 5 times of the mass of the modified polypropylene fibers, stirring the mixture in a vertical stirrer at the stirring speed of 100rpm for 1 hour to prepare concrete slurry; pouring the concrete slurry into a mould, covering the surface of the mould with a red copper net with the aperture of 80 meshes, and taking out the concrete slurry after the concrete slurry is hardened to prepare the sound absorption and noise reduction concrete.
Example 2
The sound absorption and noise reduction concrete mainly comprises the following components in parts by weight:
60 parts of cement, 6 parts of modified polypropylene fiber, 12 parts of fine sand and 60 parts of tap water.
A preparation method of sound absorption and noise reduction concrete comprises the following steps:
(1) carrying out plasma treatment on the polypropylene fine fiber, wherein the power is 80W, the vacuum degree is 30Pa, and the treatment time is 60s, so as to prepare the pretreated polypropylene fine fiber;
(2) adding 30% by mass of sodium allylsulfonate solution into a flask, introducing 5 times of nitrogen by volume of the sodium allylsulfonate solution into the flask, heating in a water bath to 70 ℃, then sequentially dropwise adding 0.1 time of 10% by mass of the sodium allylsulfonate solution and 0.5 time of 0.5 times of polyethylene glycol methyl methacrylate by mass of the sodium allylsulfonate solution, wherein the dropwise adding rate of the ammonium persulfate solution is 10 drops/min, the dropwise adding rate of the polyethylene glycol methyl methacrylate is 30 drops/min, continuing to react for 2h after the dropwise adding is finished, and adjusting the pH to 7 by using 20% by mass of sodium hydroxide solution to prepare a polycarboxylic acid water reducer blank;
(3) placing polyethylene glycol monomethyl ether into a round-bottom flask, adding dichloromethane, ethylenediamine and methylsulfonyl chloride under the nitrogen atmosphere, wherein the mass ratio of the polyethylene glycol monomethyl ether to the dichloromethane to the ethylenediamine to the methylsulfonyl chloride is 10: 2: 3: 4, reacting at room temperature for 6 hours, then dropwise adding concentrated sulfuric acid with the mass fraction of 98 percent, which is 0.02 time of the mass of the polyethylene glycol monomethyl ether, into the system at the dropping speed of 10 drops/min, uniformly stirring, adjusting the pH value to 7 by using a saturated aqueous solution of sodium bicarbonate, and extracting and purifying to obtain a polyethylene glycol monomethyl ether blank; dispersing a polyethylene glycol monomethyl ether blank in deionized water, stirring uniformly, standing until layering, taking upper-layer liquid as the polyethylene glycol monomethyl ether blank after liquid separation, dispersing in the deionized water, stirring uniformly, standing until layering, taking upper-layer liquid after liquid separation, adding anhydrous sodium sulfate, filtering after 10min, wherein the mass ratio of the polyethylene glycol monomethyl ether blank to the deionized water to the anhydrous sodium sulfate is 1: 8: 0.5, evaporating by using a rotary evaporator until no gas escapes, wherein the evaporation temperature is 50 ℃, and preparing methanesulfonyl chloride substituted polyethylene glycol monomethyl ether;
(4) the pretreated polypropylene fine fiber and the polycarboxylate superplasticizer blank are mixed according to the mass ratio of 3: 1, mixing, dropwise adding 98% concentrated sulfuric acid which is 0.02 time of the mass of the polycarboxylate superplasticizer blank at a dropping rate of 10 drops/min, uniformly stirring, standing for 24 hours, and adjusting the pH to 7 by using 20% sodium hydroxide solution to obtain a polypropylene fiber blank; transferring the polypropylene fiber blank into a beaker, adding methanesulfonyl chloride-substituted polyethylene glycol monomethyl ether with the mass of 0.5 time of that of the polypropylene fiber blank and tetrahydrofuran with the mass of 5 times of that of the polypropylene fiber blank, stirring at the constant temperature of 40 ℃ at the rotating speed of 1200rpm for 8h, taking out, drying to constant weight, performing plasma treatment with the power of 80W, the vacuum degree of 30Pa and the treatment time of 60s to obtain the modified polypropylene fiber;
(5) mixing the modified polypropylene fiber and cement with the mass 10 times that of the modified polypropylene fiber with fine sand with the mass 2 times that of the modified polypropylene fiber, adding tap water with the mass 10 times that of the modified polypropylene fiber, stirring under a vertical stirrer at the stirring speed of 200rpm for 1h to prepare concrete slurry; pouring the concrete slurry into a mould, covering the surface of the mould with a red copper net with the aperture of 80 meshes, and taking out the concrete slurry after the concrete slurry is hardened to prepare the sound absorption and noise reduction concrete.
Comparative example 1
The sound absorption and noise reduction concrete mainly comprises the following components in parts by weight:
50 parts of cement, 4 parts of modified polypropylene fiber, 4 parts of fine sand and 25 parts of tap water.
A preparation method of sound absorption and noise reduction concrete comprises the following steps:
(1) adding 20% by mass of sodium allylsulfonate solution into a flask, introducing 3 times of nitrogen by volume of the sodium allylsulfonate solution into the flask, heating in a water bath to 70 ℃, then sequentially dropwise adding 0.08% by mass of the sodium allylsulfonate solution and 5% by mass of ammonium persulfate solution and 0.3 times by mass of the sodium allylsulfonate solution of polyethylene glycol methyl methacrylate, wherein the dropwise adding rate of the ammonium persulfate solution is 10 drops/min, the dropwise adding rate of the polyethylene glycol methyl methacrylate is 30 drops/min, continuing to react for 2h after the dropwise adding is finished, and adjusting the pH to 6.5 by using 20% by mass of sodium hydroxide solution to prepare a polycarboxylic acid water reducer blank;
(2) placing polyethylene glycol monomethyl ether in a round-bottom flask, adding dichloromethane, ethylenediamine and methylsulfonyl chloride in a nitrogen atmosphere, wherein the mass ratio of the polyethylene glycol monomethyl ether to the dichloromethane to the ethylenediamine to the methylsulfonyl chloride is 10: 2: 3: 4, reacting at room temperature for 6 hours, then dropwise adding concentrated sulfuric acid with the mass fraction of 98 percent, which is 0.01 time of the mass of the polyethylene glycol monomethyl ether, into the system at the dropping speed of 10 drops/min, uniformly stirring, adjusting the pH value to 7 by using a saturated aqueous solution of sodium bicarbonate, and extracting and purifying to obtain a polyethylene glycol monomethyl ether blank; dispersing a polyethylene glycol monomethyl ether blank in deionized water, stirring uniformly, standing until layering, taking upper-layer liquid as the polyethylene glycol monomethyl ether blank after liquid separation, dispersing in the deionized water, stirring uniformly, standing until layering, taking upper-layer liquid after liquid separation, adding anhydrous sodium sulfate, filtering after 10min, wherein the mass ratio of the polyethylene glycol monomethyl ether blank to the deionized water to the anhydrous sodium sulfate is 1: 5: 0.5, evaporating by using a rotary evaporator until no gas escapes, wherein the evaporation temperature is 40 ℃, and preparing methanesulfonyl chloride substituted polyethylene glycol monomethyl ether;
(3) mixing polypropylene fine fibers and a polycarboxylate superplasticizer blank according to the mass ratio of 3: 1, mixing, dropwise adding 98% concentrated sulfuric acid which is 0.01 time of the mass of the polycarboxylate superplasticizer blank at a dropping rate of 10 drops/min, uniformly stirring, standing for 24 hours, and adjusting the pH to 6 by using 20% sodium hydroxide solution to obtain a polypropylene fiber blank; transferring a polypropylene fiber blank into a beaker, adding methanesulfonyl chloride-substituted polyethylene glycol monomethyl ether with the mass 0.3 time that of the polypropylene fiber blank and tetrahydrofuran with the mass 5 times that of the polypropylene fiber blank, stirring at the constant temperature of 40 ℃ at the rotating speed of 800rpm for 5h, taking out, drying to constant weight, performing plasma treatment with the power of 80W, the vacuum degree of 30Pa and the treatment time of 30s to obtain the modified polypropylene fiber;
(4) mixing the modified polypropylene fiber and cement which is 10 times of the mass of the modified polypropylene fiber with fine sand which is 1 time of the mass of the modified polypropylene fiber, adding tap water which is 5 times of the mass of the modified polypropylene fiber, stirring under a vertical stirrer at the stirring speed of 100rpm for 1 hour to prepare concrete slurry; pouring the concrete slurry into a mould, covering the surface of the mould with a red copper net with the aperture of 80 meshes, and taking out the concrete slurry after the concrete slurry is hardened to prepare the sound absorption and noise reduction concrete.
Comparative example 2
The sound absorption and noise reduction concrete mainly comprises the following components in parts by weight:
50 parts of cement, 4 parts of modified polypropylene fiber, 4 parts of fine sand and 25 parts of tap water.
A preparation method of sound absorption and noise reduction concrete comprises the following steps:
(1) carrying out plasma treatment on the polypropylene fine fiber, wherein the power is 80W, the vacuum degree is 30Pa, and the treatment time is 30s, so as to prepare the pretreated polypropylene fine fiber;
(2) adding 20% by mass of sodium allylsulfonate solution into a flask, introducing 3 times of nitrogen by volume of the sodium allylsulfonate solution into the flask, heating in a water bath to 70 ℃, then sequentially dropwise adding 0.08% by mass of the sodium allylsulfonate solution and 5% by mass of ammonium persulfate solution and 0.3 times by mass of the sodium allylsulfonate solution of polyethylene glycol methyl methacrylate, wherein the dropwise adding rate of the ammonium persulfate solution is 10 drops/min, the dropwise adding rate of the polyethylene glycol methyl methacrylate is 30 drops/min, continuing to react for 2h after the dropwise adding is finished, and adjusting the pH to 6.5 by using 20% by mass of sodium hydroxide solution to prepare the polycarboxylic acid water reducer;
(3) mixing the pretreated polypropylene fine fiber and a polycarboxylic acid water reducing agent according to the mass ratio of 3: 1, mixing, dropwise adding 98% concentrated sulfuric acid which is 0.01 time of the mass of the polycarboxylate superplasticizer, wherein the dropwise adding speed is 10 drops/min, uniformly stirring, standing for 24h, and adjusting the pH to 6 by using 20% sodium hydroxide solution to obtain modified polypropylene fibers;
(4) mixing modified polypropylene fibers and cement which is 10 times of the mass of the modified polypropylene fibers with fine sand which is 1 time of the mass of the modified polypropylene fibers, adding tap water which is 5 times of the mass of the modified polypropylene fibers, stirring the mixture in a vertical stirrer at the stirring speed of 100rpm for 1 hour to prepare concrete slurry; pouring the concrete slurry into a mould, covering the surface of the mould with a red copper net with the aperture of 80 meshes, and taking out the concrete slurry after the concrete slurry is hardened to prepare the sound absorption and noise reduction concrete.
Comparative example 3
The sound absorption and noise reduction concrete mainly comprises the following components in parts by weight:
50 parts of cement, 4 parts of polypropylene fine fibers, 4 parts of fine sand and 25 parts of tap water.
A preparation method of sound absorption and noise reduction concrete comprises the following steps:
(1) mixing polypropylene fine fibers and cement with the mass of 10 times that of the polypropylene fine fibers with fine sand with the mass of 1 time that of the polypropylene fine fibers, adding tap water with the mass of 5 times that of the polypropylene fine fibers, stirring the mixture in a vertical stirrer at the stirring speed of 100rpm for 1 hour to prepare concrete slurry; pouring the concrete slurry into a mould, covering the surface of the mould with a red copper net with the aperture of 80 meshes, and taking out the concrete slurry after the concrete slurry is hardened to prepare the sound absorption and noise reduction concrete.
Effect example 1
Table 1 below gives the results of analyzing the sound absorption performance of the sound absorbing and noise reducing concrete using examples 1 and 2 of the present invention and comparative examples 1, 2 and 3.
TABLE 1
| Sound absorption coefficient at frequency 0.5k | Sound absorption coefficient at frequency 1k | |
| Example 1 | 0.4389 | 0.8989 |
| Example 2 | 0.4319 | 0.8791 |
| Comparative example 1 | 0.2468 | 0.5734 |
| Comparative example 2 | 0.3543 | 0.6587 |
| Comparative example 3 | 0.1944 | 0.4372 |
Compared with the experimental data of the comparative examples 1, 2 and 3 in the table 1, it can be obviously found that the sound absorption and noise reduction concrete prepared in the examples 1 and 2 has higher sound absorption coefficient and better sound absorption and noise reduction performance, which indicates that when the sound absorption and noise reduction concrete is prepared, pits formed by the pretreated polypropylene fibers are sealed by the polycarboxylate water reducer, so that the sound absorption and noise reduction performance of the product is enhanced, and the polyethylene glycol monomethyl ether substituted by methanesulfonyl chloride is grafted on the polypropylene fiber blank, so that the polycarboxylate water reducer and the polypropylene fibers can be combined more tightly, the dispersibility of the polycarboxylate water reducer and the polypropylene fibers in cement is enhanced, and further the sound absorption performance of the product is enhanced.
Effect example 2
Table 2 below shows the analysis results of the compression strength and the cleavage strength of the sound absorption and noise reduction concrete using examples 1 and 2 and comparative examples 1, 2 and 3 according to the present invention.
TABLE 2
| Compressive strength (MPa) | Splitting strength (MPa) | |
| Example 1 | 30.24 | 2.61 |
| Example 2 | 30.19 | 2.59 |
| Comparative example 2 | 26.56 | 1.92 |
| Comparative example 3 | 24.22 | 2.34 |
Compared with the experimental data of the comparative examples 1, 2 and 3 in the table 1, it can be obviously found that the compression strength and the cleavage strength of the sound absorption and noise reduction concrete prepared in the examples 1 and 2 are better, which shows that grafting of methanesulfonyl chloride substituted polyethylene glycol monomethyl ether on a polypropylene fiber blank can enable the polycarboxylic acid water reducing agent to be combined with the polypropylene fiber more tightly, enhance the dispersibility of the polycarboxylic acid water reducing agent in the cement, and then carrying out plasma treatment on the polypropylene fine fiber entangled with the carboxylic acid water reducing agent, not only complexing with calcium ions, but also combining with the cement more tightly, thereby enhancing the compression strength and the cleavage strength of the concrete.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (1)
1. A sound absorption and noise reduction concrete is characterized in that: the adhesive mainly comprises the following components in parts by weight:
50 parts of cement, 4 parts of modified polypropylene fiber, 4 parts of fine sand and 25 parts of tap water;
the preparation method of the sound absorption and noise reduction concrete for the crusher comprises the following steps:
(1) carrying out plasma treatment on the polypropylene fine fiber, wherein the power is 80W, the vacuum degree is 30Pa, and the treatment time is 30s, so as to prepare the pretreated polypropylene fine fiber;
(2) adding a sodium allylsulfonate solution with the mass fraction of 20% into a flask, introducing nitrogen with the volume of 3 times that of the sodium allylsulfonate solution into the flask, heating in a water bath to 70 ℃, sequentially dropwise adding an ammonium persulfate solution with the mass fraction of 5% and polyethylene glycol methyl methacrylate with the mass fraction of 0.3 time that of the sodium allylsulfonate solution, wherein the mass fraction of the ammonium persulfate solution is 0.08 times that of the sodium allylsulfonate solution, the mass fraction of the polyethylene glycol methyl methacrylate is 30 drops/min, continuously reacting for 2 hours after the dropwise addition is finished, and regulating the pH to 6.5 by using a sodium hydroxide solution with the mass fraction of 20% to prepare a polycarboxylic acid water reducer blank;
(3) placing polyethylene glycol monomethyl ether into a round-bottom flask, adding dichloromethane, ethylenediamine and methylsulfonyl chloride under the nitrogen atmosphere, wherein the mass ratio of the polyethylene glycol monomethyl ether to the dichloromethane to the ethylenediamine to the methylsulfonyl chloride is 10: 2: 3: 4, reacting at room temperature for 6 hours, then dropwise adding concentrated sulfuric acid with the mass fraction of 98 percent, which is 0.01 time of that of the polyethylene glycol monomethyl ether, into the system at the dropping speed of 10 drops/min, uniformly stirring, adjusting the pH value to 7 by using a saturated aqueous solution of sodium bicarbonate, and extracting and purifying to obtain a polyethylene glycol monomethyl ether blank; dispersing a polyethylene glycol monomethyl ether blank in deionized water, stirring uniformly, standing until layering, taking upper-layer liquid as the polyethylene glycol monomethyl ether blank after liquid separation, dispersing in the deionized water, stirring uniformly, standing until layering, taking upper-layer liquid after liquid separation, adding anhydrous sodium sulfate, filtering after 10min, wherein the mass ratio of the polyethylene glycol monomethyl ether blank to the deionized water to the anhydrous sodium sulfate is 1: 5: 0.5, evaporating by using a rotary evaporator until no gas escapes, wherein the evaporation temperature is 40 ℃, and preparing methanesulfonyl chloride substituted polyethylene glycol monomethyl ether;
(4) the pretreated polypropylene fine fiber and the polycarboxylate superplasticizer blank are mixed according to the mass ratio of 3: 1, mixing, dropwise adding 98% concentrated sulfuric acid which is 0.01 time of the mass of the polycarboxylate superplasticizer blank at a dropping rate of 10 drops/min, uniformly stirring, standing for 24 hours, and adjusting the pH to 6 by using 20% sodium hydroxide solution to obtain a polypropylene fiber blank; transferring a polypropylene fiber blank into a beaker, adding methanesulfonyl chloride-substituted polyethylene glycol monomethyl ether with the mass 0.3 time that of the polypropylene fiber blank and tetrahydrofuran with the mass 5 times that of the polypropylene fiber blank, stirring at the constant temperature of 40 ℃ at the rotating speed of 800rpm for 5h, taking out, drying to constant weight, performing plasma treatment with the power of 80W, the vacuum degree of 30Pa and the treatment time of 30s to obtain the modified polypropylene fiber;
(5) mixing modified polypropylene fibers and cement which is 10 times of the mass of the modified polypropylene fibers with fine sand which is 1 time of the mass of the modified polypropylene fibers, adding tap water which is 5 times of the mass of the modified polypropylene fibers, stirring the mixture in a vertical stirrer at the stirring speed of 100rpm for 1 hour to prepare concrete slurry; pouring the concrete slurry into a mould, covering the surface of the mould with a red copper net with the aperture of 80 meshes, and taking out the concrete slurry after the concrete slurry is hardened to obtain the sound absorption and noise reduction concrete.
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| CN116813281A (en) * | 2023-07-17 | 2023-09-29 | 中铁十五局集团有限公司 | High-performance concrete for subway engineering and preparation method thereof |
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Effective date of registration: 20221223 Address after: Room 3001-10, 30/F, No. 362-366, Huanshi East Road, Guangzhou, Guangdong 510000 Applicant after: GUANGZHOU PEARL RIVER DECORATION ENGINEERING Co.,Ltd. Address before: 215000 No. 666 yinzang Road, Wuzhong District, Suzhou City, Jiangsu Province Applicant before: He Linfeng |
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