CN112679153B - Concrete containing waste brick powder - Google Patents
Concrete containing waste brick powder Download PDFInfo
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- CN112679153B CN112679153B CN202110089860.7A CN202110089860A CN112679153B CN 112679153 B CN112679153 B CN 112679153B CN 202110089860 A CN202110089860 A CN 202110089860A CN 112679153 B CN112679153 B CN 112679153B
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Abstract
The application relates to the field of concrete, and specifically discloses concrete containing waste brick powder, which is prepared from the following raw materials in parts by weight: 200 parts of cement 180-dose, 20-35 parts of waste brick powder, 60-80 parts of fly ash, 60-80 parts of mineral powder, 750 parts of river sand 690-dose, 1100 parts of gravel 1080-dose, 8.4-10.4 parts of an additive, 15-20 parts of composite fiber, 10-16 parts of modified silica microspheres and 165 parts of water 158-dose; the composite fiber comprises the following raw materials: polylactic acid fiber, polyurethane fiber and propolis; has the advantage of improving the noise absorption effect of the concrete.
Description
Technical Field
The present application relates to the field of concrete, and more particularly, it relates to a concrete containing waste brick dust.
Background
Along with the demolition of old buildings, a large amount of construction waste mainly comprising clay bricks is increasing, and the waste clay bricks become one of the main pollution sources of environmental pollution and land occupation.
Along with the continuous building of new building, the concrete volume of using constantly rises, if with adopting the waste brick powder part to replace cement production concrete, not only can practice thrift natural grit resource, can also consume a lot of waste brick powder, when solving environmental pollution, can also reduce engineering cost.
With the development of society, the number of residential buildings is continuously increased, and with the improvement of living standard of people, the requirement for living environment is higher and higher, and in order to reduce the influence of noise on the life of people, the concrete capable of absorbing noise is gradually paid attention to by people.
Disclosure of Invention
In order to improve the effect of concrete noise absorption, this application provides a concrete that contains useless brick powder.
The application provides a concrete that contains useless brick powder adopts following technical scheme:
the concrete containing the waste brick powder is prepared from the following raw materials in parts by weight: 200 parts of cement 180-dose, 20-35 parts of waste brick powder, 60-80 parts of fly ash, 60-80 parts of mineral powder, 750 parts of river sand 690-dose, 1100 parts of gravel 1080-dose, 8.4-10.4 parts of an additive, 15-20 parts of composite fiber, 10-16 parts of modified silica microspheres and 165 parts of water 158-dose; the composite fiber comprises the following raw materials: polylactic acid fiber, polyurethane fiber and propolis.
By adopting the technical scheme, the waste brick powder, the composite fiber and the modified silica microsphere are matched, the modified silica microsphere and part of the waste brick powder are attached to the surface of the composite fiber, the sound wave is firstly contacted with the modified silica microsphere and the waste brick powder, the high-frequency sound wave is preliminarily absorbed by utilizing the porous structures inside the modified silica microsphere and the waste brick powder, the rest sound wave is gradually transmitted to the surface of the composite fiber, the composite fiber continuously absorbs the medium-frequency and high-frequency sound wave, in the concrete structure, the sound wave which is not absorbed by the composite fiber can be absorbed by the pores of the modified silica microsphere and the waste brick powder on the surface again due to the unidirectional transmission of the sound wave, so that the prepared concrete has a good absorption effect on the medium-frequency and high-frequency sound wave, and the prepared concrete has a good noise absorption effect.
The composite fiber is prepared by matching polylactic acid fiber, polyurethane fiber and propolis, the film-forming property of the propolis wraps and connects space network pores formed by a space network structure, and the composite fiber can better absorb sound waves by matching with the higher elasticity and resilience of the fiber; the polylactic acid fiber contains hydroxyl, the polyurethane fiber contains amine, the polylactic acid fiber and the polyurethane fiber can be wound and folded to form a space network structure due to electrostatic attraction, the propolis has good plasticity and cohesiveness, and the propolis can be used for improving the plasticity of the space network structure and firmly bonding the polylactic acid fiber and the polyurethane fiber together; when the sound waves are contacted with the composite fibers, the sound waves are firstly contacted with the propolis films on the outer surfaces of the space network structures, the film structures are used for primarily absorbing the sound waves, the rest sound waves are contacted with the fibers of the space network structures, the polylactic acid fibers and the polyurethane fibers in the space network structures are bonded by the propolis, and the high-frequency sound waves in the space network structures can be better absorbed by matching the pores of the space network structures with the high elastic modulus of the fibers and the propolis, so that the composite fibers have a good noise absorbing effect.
Preferably, the composite fiber is prepared by the following method:
weighing 35-45 parts of polylactic acid fiber and 35-45 parts of polyurethane fiber, and respectively preparing pretreated polylactic acid fiber and pretreated polyurethane fiber after pretreatment;
② weighing 1-3 parts of propolis, placing into 45-70 parts of ethanol, stirring for 1-2h at 75-85 ℃, continuously supplementing ethanol during the stirring to keep the total amount of ethanol unchanged, and preparing into propolis solution;
thirdly, adding the prepared propolis solution into the pretreated polylactic acid fiber in the step one within 60 to 90 seconds, continuously stirring at the rotating speed of 500 plus materials at 800r/min to prepare a mixed material, placing the mixed material into the pretreated polyurethane fiber in the step one, stirring at the rotating speed of 500 plus materials at 800r/min for 4 to 8min after mixing, then stirring at the rotating speed of 280 plus materials at 350r/min for 10 to 16min, and drying to prepare the composite fiber.
By adopting the technical scheme, the propolis solution is slowly added into the pretreated polylactic acid fiber, so that the propolis solution is uniformly contacted with the polylactic acid fiber, the propolis solution is uniformly adhered to the surface of the polylactic acid fiber, after the mixture is prepared, the mixture is placed into the polyurethane fiber, high-speed stirring is carried out, the polylactic acid fiber and the polyurethane fiber are ensured to be uniformly contacted to form a space network structure, and then stirring is carried out at a low speed for 10-16min, so that the formed space network structure is prevented from being damaged, and the effect of the composite fiber on absorbing sound waves is influenced.
Preferably, the pretreatment in the step (i) is:
weighing 35-45 parts of polylactic acid fiber, placing the polylactic acid fiber in 80-95 parts of shell powder, and grinding for 10-15min at the rotating speed of 1200-1800r/min to prepare pretreated polylactic acid fiber; weighing 35-45 parts of polyurethane fiber, placing the polyurethane fiber in 85-95 parts of shell powder, and grinding for 10-15min at the rotating speed of 1200-1800r/min to obtain the pretreated polyurethane fiber.
By adopting the technical scheme, the shell powder is utilized to pretreat the polylactic acid fiber and the polyurethane fiber, and in the process of high-speed grinding, the grinding effect of the shell powder can be utilized to enable the surfaces of the polylactic acid fiber and the polyurethane fiber to form rough pores, so that the porous effect of the surfaces of the polyurethane fiber and the polylactic acid fiber is improved, and the sound absorption effect of the polylactic acid fiber and the polyurethane fiber is improved; and the shell powder gradually generates electrostatic action in the grinding process, so that part of the shell powder is easily attached to the surfaces of the polylactic acid fiber and the polyurethane fiber, the shell powder has a good sound wave absorption effect, the shell powder attached to the surfaces of the polylactic acid fiber and the polyurethane fiber can improve the absorption effect of the polylactic acid fiber and the polyurethane fiber on medium and high frequency sound waves, and the concrete has a high noise absorption effect.
Preferably, the waste brick powder is prepared by the following method:
crushing, cleaning and drying waste bricks to obtain powder with the particle size of 5-15mm, and performing oxygen plasma treatment on the powder for 1-2min to obtain waste brick powder.
By adopting the technical scheme, the mud material on the surface of the waste brick is removed after the waste brick is crushed, cleaned and dried, so that the water absorption of the powder is reduced; and performing oxygen plasma treatment on the prepared powder, and forming pits on the surface of the powder by utilizing the better etching effect of the oxygen plasma, thereby improving the absorption effect of the waste brick powder on medium and high frequency sound waves.
Preferably, after the powder material is subjected to oxygen plasma treatment, the powder material is placed in mixed gas filled with nitrogen and methane and treated for 4-10min under the pressure of 3-5MPa, and waste brick powder is prepared.
Through adopting above-mentioned technical scheme, through the processing of the higher pressure of nitrogen gas and methane mist cooperation for useless brick powder surface hole intercommunication useless brick powder inside hole, the pore structure of intercommunication can improve the circulation of air, thereby improves the absorption effect of useless brick powder to the noise.
Preferably, the modified silica microspheres are prepared by the following method:
weighing 8-12 parts of sodium silicate solution and 35-44 parts of deionized water, mixing to obtain a mixed solution, adding cation exchange resin into the mixed solution until the pH value of supernatant is 3, standing, and taking supernatant as silicic acid solution;
II, weighing 35-44 parts of benzyl alcohol, 1.5-2.4 parts of 1.4wt% of methyl cellulose aqueous solution, 1.6-2.3 parts of 19wt% of octyl phenol polyoxyethylene ether and 36-44 parts of silicic acid solution prepared by the step I, mixing and stirring to prepare emulsion, and carrying out vacuum rotary evaporation, suction filtration, washing and drying on the emulsion to prepare silicon dioxide microspheres;
and III, weighing 20-28 parts of the silicon dioxide microspheres prepared by the II, soaking in 55-70 parts of fluorosilane solution for 12-15h, and drying to obtain the modified silicon dioxide microspheres.
By adopting the technical scheme, a sodium silicate solution is taken as an initial silicon source, a silicic acid solution is obtained through cation exchange resin, and then the silicon dioxide microspheres with porous structures are prepared under the coordination of benzyl alcohol, a methyl cellulose aqueous solution and octyl phenol polyoxyethylene ether, and the prepared silicon dioxide microspheres have higher pore structures and can better absorb medium-high frequency sound waves; the prepared silicon dioxide microspheres are soaked in a fluorosilane solution, so that the surface and the internal pore structures of the silicon dioxide microspheres have good hydrophobic effect, and the influence on the mechanical strength of concrete caused by excessive water absorption of the porous structures in the silicon dioxide microspheres is avoided.
Preferably, the pretreated microspheres are prepared after drying in the step II, 8-13 parts of the pretreated microspheres are weighed and dispersed in 90-110 parts of dilute ammonia water, the mixture is stirred for 5-15min at the temperature of 75-85 ℃, and the silica microspheres are prepared after suction filtration and washing until effluent liquid is neutral and vacuum drying.
By adopting the technical scheme, the pretreated microspheres are subjected to heat treatment by using dilute ammonia water, so that the average pore diameter of the silica microspheres is gradually increased, and pores inside the silica microspheres are communicated, thereby improving the absorption effect of the silica microspheres on medium and high frequency sound waves.
Preferably, the admixture consists of sodium sulfate and a polycarboxylic acid water reducing agent in a weight ratio of 1 (3-4.5).
By adopting the technical scheme, the concrete has higher early strength and later strength by matching the sodium sulfate with the polycarboxylate superplasticizer.
In summary, the present application has the following beneficial effects:
1. waste brick powder, composite fiber, modified silica microballon cooperate, utilize modified silica microballon and the inside porous structure of waste brick powder to carry out preliminary absorption to high frequency sound wave, cooperate composite fiber's space network structure further to absorb to the medium frequency sound wave, make the concrete that makes have good absorption effect to the medium frequency sound wave to make the concrete that makes have better noise absorption's effect.
2. The bonding property and the film forming property of the propolis can enable the polylactic acid fibers and the polyurethane fibers to be bonded, so that the space network structure formed by the polylactic acid fibers and the polyurethane fibers has high plasticity, and the phenomenon that the space network structure is deformed by external force of concrete to influence the noise absorption effect of space network structure pores is avoided.
3. The waste brick powder, the modified silica microspheres and the composite fibers are matched, and fine cracks of the internal structure of the concrete are reduced by utilizing the good filling effect of the waste brick powder and the modified silica microspheres in the internal structure of the concrete; the polyurethane fibers contain amine, the cement particles coated with the water reducing agent show negative electricity, and the polyurethane fibers and the cement particles coated with the water reducing agent improve the cohesiveness between the polyurethane fibers and the cement particles coated with the admixture through an electrostatic attraction effect, so that the connection effect of the composite fibers and the internal structure of the concrete is improved, and the mechanical strength of the concrete is improved.
4. The propolis has a good film forming effect, and a propolis film formed by the propolis has an absorption effect on low and medium frequency sound waves.
Detailed Description
The present application will be described in further detail with reference to examples.
Preparation example of composite fiber
Polylactic acid fibers among the following raw materials were purchased from Gao Xin chemical fibers Co., Ltd, Jiangyin; the shell powder is purchased from Hengxin mineral product processing factories in Lingshou county; polyurethane fibers were purchased from corridor, Venus chemical Co., Ltd; propolis was purchased from Qihongtang pharmaceutical Co., Ltd, Bozhou city; the absolute ethyl alcohol is purchased from Shandong Qiangsen chemical industry Co., Ltd, and the content is 99.9%; other raw materials and equipment are all sold in the market.
Preparation example 1: the composite fiber is prepared by the following method:
weighing 40kg of polylactic acid fiber, placing the polylactic acid fiber in 88kg of shell powder, and grinding for 12min at the rotating speed of 1500r/min to prepare pretreated polylactic acid fiber; weighing 40kg of polyurethane fiber, placing the polyurethane fiber in 90kg of shell powder, and grinding for 12min at the rotating speed of 1500r/min to prepare pretreated polyurethane fiber;
weighing 2kg of propolis, placing the propolis in 60kg of absolute ethyl alcohol, stirring for 1.5h at the temperature of 80 ℃, continuously supplementing the absolute ethyl alcohol during the stirring, and keeping the total amount of the absolute ethyl alcohol to be 60kg all the time to prepare a propolis solution;
thirdly, adding the propolis solution prepared in the second step into the pretreated polylactic acid fiber prepared in the first step within 80s, and continuously stirring at the rotating speed of 680r/min to prepare a mixture; and (3) placing the mixture into the pretreated polyurethane fiber prepared in the step one, mixing, stirring at the rotating speed of 680r/min for 6min, then stirring at the rotating speed of 300r/min for 13min, and drying at room temperature to obtain the composite fiber.
Preparation example 2: the composite fiber is prepared by the following method:
weighing 35kg of polylactic acid fiber, placing the polylactic acid fiber in 80kg of shell powder, and grinding for 10min at the rotating speed of 1200r/min to prepare pretreated polylactic acid fiber; weighing 35kg of polyurethane fiber, placing the polyurethane fiber in 85kg of shell powder, and grinding for 10min at the rotating speed of 1200r/min to prepare pretreated polyurethane fiber;
weighing 1kg of propolis, putting the propolis into 45kg of absolute ethyl alcohol, stirring for 1h at 75 ℃, continuously supplementing the absolute ethyl alcohol during the stirring, and keeping the total amount of the absolute ethyl alcohol to be 45kg all the time to prepare a propolis solution;
thirdly, adding the propolis solution prepared in the second step into the pretreated polylactic acid fiber prepared in the first step within 60 seconds, and continuously stirring at the rotating speed of 500r/min to prepare a mixture; and (3) placing the mixture into the pretreated polyurethane fiber prepared in the step one, stirring for 4min at the rotating speed of 500r/min after mixing, then stirring for 10min at the rotating speed of 280r/min, and drying at room temperature to obtain the composite fiber.
Preparation example 3: the composite fiber is prepared by the following method:
firstly, weighing 45kg of polylactic acid fiber, placing the polylactic acid fiber in 95kg of shell powder, and grinding for 15min at the rotating speed of 1800r/min to prepare pretreated polylactic acid fiber; weighing 45kg of polyurethane fiber, placing the polyurethane fiber in 95kg of shell powder, and grinding for 15min at the rotating speed of 1800r/min to prepare pretreated polyurethane fiber;
weighing 5kg of propolis, placing the propolis in 70kg of absolute ethyl alcohol, stirring for 2 hours at 85 ℃, continuously supplementing the absolute ethyl alcohol during the stirring, and keeping the total amount of the absolute ethyl alcohol to be 70kg all the time to prepare a propolis solution;
thirdly, adding the propolis solution prepared in the second step into the pretreated polylactic acid fiber prepared in the first step within 90 seconds, and continuously stirring at the rotating speed of 800r/min to prepare a mixture; and (3) placing the mixture into the pretreated polyurethane fiber prepared in the step one, stirring for 8min at the rotating speed of 800r/min after mixing, then stirring for 16min at the rotating speed of 350r/min, and drying at room temperature to obtain the composite fiber.
Preparation example of waste brick powder
The following raw materials and equipment are all commercially available.
Preparation example 4: the waste brick powder is prepared by the following method:
crushing waste brick blocks into brick powder with the particle size of 5-25 mm; washing the brick powder for 2 times, then drying for 35min at 320 ℃, and screening to obtain powder with the particle size of 5-15 mm; placing the powder in a plasma cleaning machine, and performing oxygen plasma treatment for 1.6min to obtain semi-finished brick powder;
the semi-finished brick powder is placed in mixed gas with nitrogen and methane and treated for 6min under the pressure of 4MPa, and waste brick powder is prepared.
Preparation example 5: the waste brick powder is prepared by the following method:
crushing waste brick blocks into brick powder with the particle size of 5-25 mm; washing the brick powder for 2 times, then drying for 35min at 320 ℃, and screening to obtain powder with the particle size of 5-15 mm; placing the powder in a plasma cleaning machine for oxygen plasma treatment for 1min to obtain semi-finished brick powder;
the semi-finished brick powder is placed in mixed gas with nitrogen and methane and treated for 4min under the pressure of 3MPa, and waste brick powder is prepared.
Preparation example 6: the waste brick powder is prepared by the following method:
crushing waste brick blocks into brick powder with the particle size of 5-25 mm; washing the brick powder for 2 times, then drying for 35min at 320 ℃, and screening to obtain powder with the particle size of 5-15 mm; placing the powder in a plasma cleaning machine for oxygen plasma treatment for 2min to obtain semi-finished brick powder;
the semi-finished brick powder is placed in mixed gas with nitrogen and methane and treated for 10min under the pressure of 5MPa, and waste brick powder is prepared.
Preparation example of modified silica microspheres
The sodium silicate solution in the following raw materials is purchased from Jiangyin national Union chemical Co., Ltd, wherein the mass fraction of the silicon dioxide is 38.3 percent, and the mass fraction of the sodium oxide is 12.8 percent; the benzyl alcohol is purchased from Tianjin Jiangtian chemical technology limited company and is analyzed and purified; the ammonia water is purchased from Tianjin Jiangtian chemical technology limited company and is analyzed to be pure, and the mass fraction of the ammonia water is 25 percent; the methyl cellulose is purchased from Tianjin Jiangtian chemical technology limited company and is analyzed and purified; the octyl phenol polyoxyethylene ether is purchased from Tianjin Jiangtian chemical technology Limited company and is analyzed to be pure; the absolute ethyl alcohol is purchased from Tianjin Jiangtian chemical technology Limited company, and is analyzed to be pure, and the mass fraction is 99.5%; cation exchange resins (005x7) were purchased from resin corporation, university of Tianjin nan Kao; other raw materials and equipment are all sold in the market.
Preparation example 7: the modified silicon dioxide microspheres are prepared by the following method:
weighing 10kg of sodium silicate solution and 40kg of deionized water, mixing to obtain a mixed solution, adding activated cation exchange resin into the mixed solution while magnetically stirring the mixed solution until the pH value of supernatant is 3, standing for 30min, and taking supernatant to obtain a silicic acid solution;
II, weighing 40kg of benzyl alcohol, adding 2kg of 1.4wt% methyl cellulose aqueous solution and 2kg of 19wt% octyl phenol polyoxyethylene ether into the benzyl alcohol, and stirring at the rotating speed of 850r/min for 5min to prepare a premixed solution; weighing 40kg of silicic acid solution, adding into the premixed solution, and continuously stirring for 10min to obtain emulsion; carrying out vacuum rotary evaporation on the emulsion for 30min at the temperature of 60 ℃, then carrying out suction filtration, washing by using an ethanol water solution with the mass fraction of 65%, and carrying out vacuum drying at the temperature of 90 ℃ to obtain pretreated microspheres;
III, weighing 10kg of pretreated microspheres prepared from II, dispersing in 100kg of dilute ammonia water with pH of 9, stirring at the rotating speed of 550r/min for 10min at the temperature of 80 ℃, performing suction filtration and deionized water washing until the flowing liquid is neutral, and then performing vacuum drying for 24h at the temperature of 90 ℃ to prepare silicon dioxide microspheres;
IV, weighing 2kg of fluorosilane and 50kg of normal hexane, mixing, adding 30kg of deionized water with the pH value adjusted to 3 by using acetic acid, stirring for 5min at the rotating speed of 300r/min, and mixing to obtain a fluorosilane solution; and weighing 25kg of the silica microspheres prepared from the III, soaking the silica microspheres in 64kg of fluorosilane solution for 13.5h, and drying at room temperature to prepare the modified silica microspheres.
Preparation example 8: the modified silicon dioxide microspheres are prepared by the following method:
weighing 8kg of sodium silicate solution and 35kg of deionized water, mixing to obtain a mixed solution, adding activated cation exchange resin into the mixed solution while magnetically stirring the mixed solution until the pH value of supernatant is 3, standing for 30min, and taking supernatant to obtain a silicic acid solution;
II, weighing 35kg of benzyl alcohol, adding 1.5kg of 1.4wt% methyl cellulose aqueous solution and 1.6kg of 19wt% octyl phenol polyoxyethylene ether into the benzyl alcohol, and stirring at the rotating speed of 850r/min for 5min to prepare a premixed solution; weighing 36kg of silicic acid solution, adding into the premixed solution, and continuously stirring for 10min to obtain emulsion; carrying out vacuum rotary evaporation on the emulsion for 30min at the temperature of 60 ℃, then carrying out suction filtration, washing by using an ethanol water solution with the mass fraction of 65%, and carrying out vacuum drying at the temperature of 90 ℃ to obtain pretreated microspheres;
III, weighing 8kg of pretreated microspheres prepared from II, dispersing the pretreated microspheres in 90kg of dilute ammonia water with pH value of 9, stirring at the rotating speed of 550r/min for 5min at the temperature of 75 ℃, performing suction filtration and deionized water washing until the flowing liquid is neutral, and then performing vacuum drying at the temperature of 90 ℃ for 24h to prepare silicon dioxide microspheres;
IV, weighing 2kg of fluorosilane and 50kg of normal hexane, mixing, adding 30kg of deionized water with the pH value adjusted to 3 by using acetic acid, stirring for 5min at the rotating speed of 300r/min, and mixing to obtain a fluorosilane solution; and weighing 20kg of the silica microspheres prepared from the III, soaking the silica microspheres in 55kg of fluorosilane solution for 12h, and drying at room temperature to prepare the modified silica microspheres.
Preparation example 9: the modified silicon dioxide microspheres are prepared by the following method:
weighing 12kg of sodium silicate solution and 44kg of deionized water, mixing to obtain a mixed solution, adding activated cation exchange resin into the mixed solution while magnetically stirring the mixed solution until the pH value of supernatant is 3, standing for 30min, and taking supernatant to obtain a silicic acid solution;
II, weighing 44kg of benzyl alcohol, adding 2.4kg of 1.4wt% methyl cellulose aqueous solution and 2.3kg of 19wt% octyl phenol polyoxyethylene ether into the benzyl alcohol, and stirring at the rotating speed of 850r/min for 5min to prepare a premixed solution; weighing 44kg of silicic acid solution, adding into the premix, and continuously stirring for 10min to obtain emulsion; carrying out vacuum rotary evaporation on the emulsion for 30min at the temperature of 60 ℃, then carrying out suction filtration, washing by using an ethanol water solution with the mass fraction of 65%, and carrying out vacuum drying at the temperature of 90 ℃ to obtain pretreated microspheres;
III, weighing 13kg of pretreated microspheres prepared from II, dispersing the pretreated microspheres in 110kg of dilute ammonia water with pH value of 9, stirring at the rotating speed of 550r/min for 15min at the temperature of 85 ℃, performing suction filtration and deionized water washing until the flowing liquid is neutral, and then performing vacuum drying at the temperature of 90 ℃ for 24h to prepare silicon dioxide microspheres;
IV, weighing 2kg of fluorosilane and 50kg of normal hexane, mixing, adding 30kg of deionized water with the pH value adjusted to 3 by using acetic acid, stirring for 5min at the rotating speed of 300r/min, and mixing to obtain a fluorosilane solution; and weighing 28kg of the silica microspheres prepared from the III, soaking the silica microspheres in 70kg of fluorosilane solution for 15h, and drying at room temperature to prepare the modified silica microspheres.
Examples
The cement in the following raw materials is purchased from P.O42.5 Portland cement produced by Qingdao mountain and river Innovative Cement Co Ltd; the slag powder is purchased from S95 level mineral powder produced by Qingdao Mitsu-Mitsui Kongmai Kogyo; the fly ash is purchased from Xingyuan mineral powder processing factories in Lingshou county; river sand is purchased from Yitian mineral products Co., Ltd, Shijiazhuang; polypropylene fibers were purchased from the Beijing Pengyang New building materials, Inc.; the steel fiber is purchased from the shearing wave-shaped steel fiber produced by Hebei Dingyuan engineering rubber Co Ltd; the polycarboxylic acid water reducing agent is purchased from Panjin Fulong chemical company, Inc.; sodium sulfate was purchased from anhydrous sodium sulfate produced by Ningze chemical Co., Ltd., Shouguang, with a content of 99%; other raw materials and equipment are all sold in the market.
Example 1: a concrete comprising waste brick powder:
the raw materials are as follows: 200kg of cement, 26kg of waste brick powder prepared in preparation example 4, 70kg of fly ash, 70kg of mineral powder, 725kg of river sand, 1090kg of crushed stone, 9.6kg of an additive, 18kg of composite fiber prepared in preparation example 1, 13kg of modified silica microspheres prepared in preparation example 7 and 162kg of water; the additive consists of sodium sulfate and a polycarboxylic acid water reducing agent in a weight ratio of 1:4.
Example 2: a concrete comprising waste brick powder:
the raw materials are as follows: 180kg of cement, 20kg of waste brick powder prepared in preparation example 5, 60kg of fly ash, 60kg of mineral powder, 750kg of river sand, 1080kg of macadam, 8.4kg of additive, 15kg of composite fiber prepared in preparation example 2, 10kg of modified silica microspheres prepared in preparation example 8 and 158kg of water; the additive consists of sodium sulfate and a polycarboxylic acid water reducing agent in a weight ratio of 1: 3.
Example 3: a concrete comprising waste brick powder:
the raw materials are as follows: 220kg of cement, 35kg of waste brick powder prepared in preparation example 6, 80kg of fly ash, 80kg of mineral powder, 690kg of river sand, 1100kg of gravel, 10.4kg of an additive, 20kg of composite fiber prepared in preparation example 3, 16kg of modified silica microspheres prepared in preparation example 9 and 165kg of water; the additive is composed of sodium sulfate and a polycarboxylic acid water reducing agent in a weight ratio of 1: 4.5.
The slag powder in the raw materials is S95 grade slag powder with the density of 2.8g/cm3Specific surface area of 400m2The activity index (7d) is more than or equal to 85 percent, the activity index (28d) is more than or equal to 96 percent, the fluidity ratio is more than or equal to 94 percent, and the water content is less than or equal to 0.2 percent; the fly ash is F class II fly ash, the fineness of the fly ash (45 mu m square hole sieve residue)<10% water demand ratio<100% loss on ignition<6% water content<0.2 percent; river sand with fineness modulus of 2.4 and apparent density of 2650kg/m3。
Note: the additives in the above raw materials include, but are not limited to, polycarboxylic acid water reducing agent and sodium sulfate.
Application example: a preparation method of concrete containing waste brick powder comprises the following steps:
s1, weighing cement, fly ash, mineral powder, river sand, broken stone and water, and mixing to obtain a mixture;
s2, weighing the composite fibers, the waste brick powder, the additive and the modified silicon dioxide microspheres, adding the mixture into the mixture prepared in the S1, mixing and stirring, pouring the mixture into a mold, and curing to obtain the finished concrete.
Comparative example
Comparative example 1: this comparative example differs from example 1 in that no composite fiber was added to the raw material.
Comparative example 2: this comparative example differs from example 1 in that the polyurethane fiber was replaced with polylactic acid fiber of the same mass in the raw material.
Comparative example 3: the comparative example is different from example 1 in that propolis is not added to the composite fiber raw material.
Comparative example 4: this comparative example differs from example 1 in that no modified silica microspheres were added to the starting material.
Comparative example 5: the present example differs from example 1 in that the composite fiber is prepared by the following method: thirdly, adding the propolis solution prepared in the second step into the pretreated polylactic acid fiber prepared in the first step within 80 seconds to prepare a mixture; and (3) placing the mixture into the pretreated polyurethane fiber prepared in the step (i), stirring for 19min at the rotating speed of 300r/min, and drying at room temperature to obtain the composite fiber.
Comparative example 6: the present example differs from example 1 in that the composite fiber is prepared by the following method: thirdly, adding the propolis solution prepared in the second step into the pretreated polylactic acid fiber prepared in the first step within 80s, and continuously stirring at the rotating speed of 680r/min to prepare a mixture; and (3) placing the mixture into the pretreated polyurethane fiber prepared in the step (i), mixing, stirring at the rotating speed of 680r/min for 19min, and drying at room temperature to prepare the composite fiber.
Comparative example 7: the present example differs from example 1 in that the composite fiber is prepared by the following method: weighing 40kg of polylactic acid fiber, and washing and drying to obtain pretreated polylactic acid fiber; weighing 40kg of polyurethane fiber, washing with water and drying to obtain the pretreated polyurethane fiber.
Comparative example 8: the difference between the present example and example 1 is that the waste brick powder is prepared by the following method:
crushing waste brick blocks into brick powder with the particle size of 5-25 mm; washing the brick powder for 2 times, then drying for 35min at 320 ℃, and screening to obtain semi-finished brick powder with the particle size of 5-15 mm.
Comparative example 9: the difference between the present example and example 1 is that the waste brick powder is prepared by the following method:
the semi-finished brick powder is placed in mixed gas with nitrogen and methane and treated for 6min under the pressure of 1MPa, and waste brick powder is prepared.
Comparative example 10: the difference between this example and example 1 is that the modified silica microspheres were prepared as follows:
III, weighing 10kg of silicon dioxide microspheres prepared from II, dispersing the silicon dioxide microspheres in 100kg of dilute ammonia water with pH value of 9, stirring the mixture for 10min at the temperature of 50 ℃ at the rotating speed of 550r/min, carrying out suction filtration and deionized water washing until the flowing liquid is neutral, and then carrying out vacuum drying for 24h at the temperature of 90 ℃ to prepare the silicon dioxide microspheres.
Performance test
1. Test of concrete noise absorption performance
Concrete is prepared by the preparation methods of the examples 1 to 3 and the comparative examples 1 to 10, a square area with the length multiplied by the width multiplied by the height multiplied by 2m is poured after the preparation of the concrete is finished, the interior of the square area is hollow, the wall thickness of the concrete wall is 20cm, a door is arranged in the square area, and the noise absorption effect of the concrete is detected after the concrete is cured.
The detection steps are as follows: opening a door of the square area, enabling an operator to enter the direction area, closing the door of the square area, detecting a noise decibel value in the square area by using a GS1357 noise tester, and respectively releasing noises of 40 decibels, 50 decibels, 60 decibels, 70 decibels and 80 decibels at a position 3m outside the square area, so that the operator respectively records the decibels in the square area under the corresponding decibels; the operators can bring the earplugs and the earphones well to avoid shock injuries.
TABLE 1 test chart for concrete noise absorption performance
By combining examples 1-3 and comparative examples 1-10 and combining table 1, it can be seen that the raw material of comparative example 1 is not added with the composite fiber, compared with example 1, the decibel number detected by comparative example 1 under the conditions of 40 decibels, 50 decibels, 60 decibels, 70 decibels and 80 decibels of the external environment is greater than the corresponding decibel number detected by example 1, the difference value of the decibel number detected by comparative example 1 under the condition of 40 decibels of the external environment and the decibel number detected by 50 decibels of the external environment is greater than the corresponding difference value of example 1, and the difference value detected by other decibel values of comparative example 1 under different external environments is greater than the corresponding difference value of example 1 in the same manner; the composite fiber, the modified silicon dioxide microspheres and the waste brick powder are matched, the composite fiber is used for loading the modified silicon dioxide microspheres and the waste brick powder, the porous structures in the modified silicon dioxide microspheres and the waste brick powder are used for preliminarily absorbing sound waves, and the space network structure of the composite fiber is matched for further absorbing the sound waves, so that the prepared concrete has a good sound wave absorption effect, and the prepared concrete has a good noise absorption effect.
Compared with the example 1, the decibel number detected by the comparative example 2 under the conditions of 40 decibels, 50 decibels, 60 decibels, 70 decibels and 80 decibels of the external environment is greater than the corresponding decibel number detected by the example 1, the difference value of the decibel number detected by the comparative example 2 under the condition of 40 decibels of the external environment and the decibel number detected by the external environment under the condition of 50 decibels of the external environment is greater than the corresponding difference value of the example 1, and the difference value detected by other decibel values of the comparative example 2 under different external environments is greater than the corresponding difference value of the example 1 in the same way; the polylactic acid fiber and the polyurethane fiber are matched, the polylactic acid fiber and the polyurethane fiber are wound and folded to form a space network structure by utilizing the electrostatic attraction effect, and the space network structure is utilized to improve the sound wave absorption of the concrete to the external environment, so that the concrete has a better noise absorption effect.
The raw materials of the composite fiber in the comparative example 3 are not added with propolis, compared with the composite fiber in the example 1, the decibel number detected in the comparative example 3 under the conditions of 40 decibels, 50 decibels, 60 decibels, 70 decibels and 80 decibels of the external environment is all larger than the corresponding decibel number detected in the example 1, the difference value between the decibel number detected in the comparative example 3 under the condition of 40 decibels of the external environment and the decibel number detected in the external environment under the condition of 50 decibels of the external environment is larger than the corresponding difference value in the example 1, and the difference value detected by other decibel values in different external environments in the comparative example 3 is larger than the corresponding difference value in the example 1 in the same way; the matching of the polylactic acid fiber, the polyurethane fiber and the propolis is demonstrated, the good film-forming property of the propolis can wrap and connect a space network structure formed by the polylactic acid fiber and the polyurethane fiber, and the high elasticity and resilience of the fiber are matched to absorb medium-high frequency sound waves, so that the concrete has a good noise absorption effect.
Compared with the example 1, the decibel number detected by the comparative example 4 under the condition of 40 decibels, 50 decibels, 60 decibels, 70 decibels and 80 decibels in the external environment is all larger than the corresponding decibel number detected by the example 1, the difference value between the decibel number detected by the comparative example 4 under the condition of 40 decibels in the external environment and the decibel number detected by the comparative example 4 under the condition of 50 decibels in the external environment is larger than the corresponding difference value of the example 1, and the difference values detected by other decibel values of the comparative example 4 under different external environments are larger than the corresponding difference value of the example 1 in the same way; the modified silicon dioxide microspheres, the waste brick powder and the composite fibers are matched, the composite fibers are used for loading the modified silicon dioxide microspheres and part of the waste brick powder, and the porous structure of the modified silicon dioxide microspheres is used for improving the absorption effect of the concrete on medium and high frequency sound waves, so that the effect of the concrete on absorbing noise is improved.
Comparative example 5 when preparing the composite fiber, the propolis solution is placed in the polylactic acid fiber and the polyurethane fiber without high speed stirring operation, compared with example 1, the decibels detected by comparative example 5 under the conditions of 40 decibels, 50 decibels, 60 decibels, 70 decibels and 80 decibels of the external environment are all larger than the corresponding decibels detected by example 1, and the difference value of the decibels detected by comparative example 5 under the conditions of 40 decibels of the external environment and 50 decibels of the external environment is larger than the corresponding difference value of example 1, and similarly, the difference values detected by other decibel values of comparative example 5 under different external environments are all larger than the corresponding difference value of example 1; the propolis solution and the polylactic acid fiber are stirred at a high speed so that the propolis is uniformly attached to the surface of the polylactic acid fiber, and then the polyurethane fiber is added to continue stirring at a high rotating speed, so that the polylactic acid fiber and the polyurethane fiber are ensured to be uniformly contacted to form a space network structure, and the composite fiber has a good effect of absorbing medium-high frequency sound waves, so that the effect of absorbing noise of concrete is improved.
Comparative example 6 when preparing the composite fiber, the mixture is placed in the pretreated polyurethane fiber prepared in the first step, mixed and stirred for 19min at the rotating speed of 680r/min, and the composite fiber is prepared after drying at room temperature; compared with the embodiment 1, the decibel numbers detected by the comparative example 6 under the conditions of 40 decibels, 50 decibels, 60 decibels, 70 decibels and 80 decibels of the external environment are all larger than the corresponding decibel numbers detected by the embodiment 1, the difference value of the decibel numbers detected by the comparative example 6 under the condition of 40 decibels of the external environment and the decibel numbers detected by the external environment under the condition of 50 decibels is larger than the corresponding difference value of the embodiment 1, and the difference values detected by other decibel values of the comparative example 6 under different external environments are larger than the corresponding difference value of the embodiment 1 in the same way; the stirring at a lower speed is kept, so that the formed space network structure can be prevented from being damaged, and the effect of absorbing medium-high frequency sound waves by the composite fibers is influenced.
Comparative example 7 is that when the composite fiber is prepared, the polylactic acid fiber and the polyurethane fiber are washed with water and dried to respectively prepare the pretreated polylactic acid fiber and the pretreated polyurethane fiber, compared with example 1, the decibel number detected by the comparative example 7 under the conditions of 40 decibels, 50 decibels, 60 decibels, 70 decibels and 80 decibels in the external environment is all larger than the corresponding decibel number detected by the example 1, the difference value between the decibel number detected by the comparative example 7 under the condition of 40 decibels in the external environment and the decibel number detected by the external environment under the condition of 50 decibels in the external environment is larger than the corresponding difference value of the example 1, and the difference value detected by other decibel values in different external environments of the comparative example 7 is larger than the corresponding difference value of the example 1 in the same manner; the method is characterized in that rough pores can be formed on the surfaces of the pretreated polylactic acid fibers and the pretreated polyurethane fibers obtained by grinding the shell powder, the decibel shell powder after grinding can be attached to the surfaces of the pretreated polylactic acid fibers and the pretreated polyurethane fibers, and the noise absorption effect of the pores on the surfaces of the pretreated polylactic acid fibers and the pretreated polyurethane fibers is matched with the noise absorption effect of the shell powder, so that the composite fibers can absorb middle and high frequency sound waves better, and the noise absorption effect of concrete is improved.
Comparative example 8 when the waste brick powder is prepared, the waste brick powder is not subjected to oxygen plasma treatment, compared with example 1, the decibel number detected by the comparative example 8 under the conditions of 40 decibels, 50 decibels, 60 decibels, 70 decibels and 80 decibels of the external environment is all larger than the corresponding decibel number detected by the example 1, the difference value of the decibel number detected by the comparative example 8 under the condition of 40 decibels of the external environment and the decibel number detected by the external environment under the condition of 50 decibels of the external environment is larger than the corresponding difference value of the example 1, and the difference value detected by other decibel values of the comparative example 8 under different external environments is larger than the corresponding difference value of the example 1 in the same way; the powder is subjected to oxygen plasma treatment, and pits are formed on the surface of the powder by utilizing the better etching effect of the oxygen plasma, so that the absorption effect of the waste brick powder on medium and high frequencies is improved, and the effect of concrete on absorbing noise is improved.
In the process of preparing the waste brick powder, the semi-finished brick powder is placed in mixed gas with nitrogen and methane and treated for 6min under the pressure of 1MPa to prepare the waste brick powder; compared with the embodiment 1, the decibel number detected by the comparative example 9 under the conditions of 40 decibels, 50 decibels, 60 decibels, 70 decibels and 80 decibels of the external environment is all larger than the corresponding decibel number detected by the embodiment 1, the difference value of the decibel number detected by the comparative example 9 under the condition of 40 decibels of the external environment and the decibel number detected by the external environment under the condition of 50 decibels is larger than the corresponding difference value of the embodiment 1, and the difference values detected by other decibel values of the comparative example 9 under different external environments are larger than the corresponding difference value of the embodiment 1 in the same way; the nitrogen and methane mixed gas is matched with the treatment with higher pressure, so that the surface pores of the waste brick powder are communicated with the inner pores of the waste brick powder, and the communicated pore structure can improve the air circulation, thereby improving the absorption effect of the waste brick powder on the medium and high frequency sound waves and improving the effect of concrete noise absorption.
Comparative example 10 in the preparation of modified silica microspheres, the silica microspheres prepared from 10kg of II were weighed and dispersed in 100kg of dilute ammonia water with pH 9, stirred at 50 ℃ for 10min at a rotation speed of 550r/min, filtered, washed with deionized water until the flow liquid was neutral, and then vacuum-dried at 90 ℃ for 24h to prepare silica microspheres; compared with the embodiment 1, the decibel number detected by the comparative example 10 under the conditions of 40 decibels, 50 decibels, 60 decibels, 70 decibels and 80 decibels of the external environment is all larger than the corresponding decibel number detected by the embodiment 1, the difference value of the decibel number detected by the comparative example 10 under the condition of 40 decibels of the external environment and the decibel number detected by the external environment under the condition of 50 decibels is larger than the corresponding difference value of the embodiment 1, and the difference values detected by other decibel values of the comparative example 10 under different external environments are larger than the corresponding difference value of the embodiment 1 in the same way; the method has the advantages that the dilute ammonia water is matched with the treatment at higher temperature, so that the pores inside the silica microspheres are communicated, the communication effect of the pores on the surface of the silica and the pores inside the silica is achieved, the absorption effect of the modified silica microspheres on sound waves is improved, and the effect of absorbing noise of concrete is improved.
2. Detection of compressive strength properties
And (3) manufacturing a standard test block according to GB/T50081-2019 standard of mechanical property test method of common concrete, and measuring the compressive strength of the standard test block maintained for 28 days.
3. Flexural strength Property measurement
And (3) manufacturing a standard test block according to GB/T50081-2019 standard of mechanical property test method of common concrete, and measuring the flexural strength of the standard test block for 28d of maintenance.
4. Detection of water permeation resistance
And testing the water permeation resistance pressure of the standard test block according to GB/T50082-2019 Standard test method for the long-term performance and durability of the common concrete.
TABLE 2 concrete mechanical property testing table
By combining examples 1-3 and comparative examples 1-10 and combining table 2, it can be seen that the compressive strength, flexural strength and impermeability of the concrete prepared in comparative example 1 are lower than those of example 1 compared with example 1 because the raw material in comparative example 1 is not added with the composite fiber; the concrete has the advantages that the waste brick powder, the modified silicon dioxide microspheres and the composite fibers are matched, and the good filling and bonding effects of the composite fibers are utilized, so that the concrete has good compression resistance effect, folding resistance effect and anti-permeability effect.
Compared with the concrete prepared in the example 1, the concrete prepared in the comparative example 2 has lower compressive strength, flexural strength and impermeability than those of the concrete prepared in the example 1 by replacing the polyurethane fiber with the polylactic acid fiber with the same mass in the comparative example 2; the cooperation of the polyurethane fiber and the polylactic acid fiber is demonstrated, and the concrete has better anti-bending effect, anti-compression effect and anti-permeability effect by utilizing the good bonding effect between the polyurethane fiber and the cement particles.
The raw materials of the comparative example 3 are not added with propolis, and compared with the concrete prepared in the example 1, the concrete prepared in the comparative example 3 has lower compressive strength, flexural strength and impermeability than those of the concrete prepared in the example 1; the bonding effect of the propolis can ensure that the composite fiber is well bonded in the internal structure of the concrete, thereby improving the compressive strength, the flexural strength and the anti-permeability effect of the concrete,
compared with the concrete prepared in the example 1, the concrete prepared in the comparative example 4 has lower compressive strength, flexural strength and impermeability than those of the concrete prepared in the example 1 because the modified silica microspheres are not added in the raw materials in the comparative example 4; the modified silica microspheres are matched with the composite fibers, and the pores between the composite fibers and the cement particles can be filled through the better filling effect of the modified silica microspheres, so that the compactness between the pores between the composite fibers and the cement particles is improved, and the compressive strength, the flexural strength and the impermeability effect of the concrete are improved.
Comparative example 5 in the preparation of the composite fiber, the propolis solution was placed in the polylactic acid fiber and the polyurethane fiber without a high-speed stirring operation; comparative example 6 when preparing the composite fiber, the mixture is placed in the pretreated polyurethane fiber prepared in the first step, mixed and stirred for 19min at the rotating speed of 680r/min, and the composite fiber is prepared after drying at room temperature; comparative example 7 in the preparation of the composite fiber, the polylactic acid fiber and the polyurethane fiber were washed with water and dried to prepare a pretreated polylactic acid fiber and a pretreated polyurethane fiber, respectively; compared with the example 1, the concrete prepared by the comparative examples 5, 6 and 7 has lower compressive strength, flexural strength and impermeability than the concrete prepared by the example 1; the stirring speed of the composite fiber in the preparation process has influence on the mechanical property of the concrete, and the addition of the shell powder can be further matched with the modified silica microspheres to fill the pore structure between the composite fiber and the cement particles, so that the mechanical property of the concrete is improved.
Comparative example 8 is that the waste brick powder is not subjected to oxygen plasma treatment when the waste brick powder is prepared, and comparative example 9 is that the prepared semi-finished brick powder is placed in mixed gas with nitrogen and methane and treated for 6min under the pressure of 1MPa to prepare the waste brick powder; compared with the example 1, the concrete prepared by the comparative examples 8 and 9 has lower compressive strength, flexural strength and impermeability than the concrete prepared by the example 1; it is shown that the filling effect of the waste brick powder has an influence on the mechanical strength of the concrete.
Comparative example 10 in the preparation of modified silica microspheres, the silica microspheres prepared from 10kg of II were weighed and dispersed in 100kg of dilute ammonia water with pH 9, stirred at 50 ℃ for 10min at a rotation speed of 550r/min, filtered, washed with deionized water until the flow liquid was neutral, and then vacuum-dried at 90 ℃ for 24h to prepare silica microspheres; compared with the concrete prepared in the example 1, the concrete prepared in the comparative example 10 has lower compressive strength, flexural strength and impermeability than those of the concrete prepared in the example 1; the communication effect of the modified silicon dioxide pores can lead the volume weight of the modified silicon dioxide particles to be light, thereby being convenient for filling in the pores inside the concrete and improving the compression strength, the breaking strength and the anti-permeability effect of the concrete.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (6)
1. The concrete containing the waste brick powder is characterized by being prepared from the following raw materials in parts by weight: 200 parts of cement 180-dose, 20-35 parts of waste brick powder, 60-80 parts of fly ash, 60-80 parts of mineral powder, 750 parts of river sand 690-dose, 1100 parts of gravel 1080-dose, 8.4-10.4 parts of an additive, 15-20 parts of composite fiber, 10-16 parts of modified silica microspheres and 165 parts of water 158-dose; the composite fiber comprises the following raw materials: polylactic acid fiber, polyurethane fiber and propolis;
the composite fiber is prepared by the following method:
weighing 35-45 parts of polylactic acid fiber and 35-45 parts of polyurethane fiber, and respectively preparing pretreated polylactic acid fiber and pretreated polyurethane fiber after pretreatment;
② weighing 1-3 parts of propolis, placing into 45-70 parts of ethanol, stirring for 1-2h at 75-85 ℃, continuously supplementing ethanol during the stirring to keep the total amount of ethanol unchanged, and preparing into propolis solution;
thirdly, adding the prepared propolis solution into the pretreated polylactic acid fiber obtained in the step one within 60 to 90 seconds, continuously stirring at the rotating speed of 500 plus 800r/min to obtain a mixture, placing the mixture into the pretreated polyurethane fiber obtained in the step one, stirring at the rotating speed of 500 plus 800r/min for 4 to 8min after mixing, then stirring at the rotating speed of 280 plus 350r/min for 10 to 16min, and drying to obtain the composite fiber;
the pretreatment in the step (i) is as follows:
weighing 35-45 parts of polylactic acid fiber, placing the polylactic acid fiber in 80-95 parts of shell powder, and grinding for 10-15min at the rotating speed of 1200-1800r/min to prepare pretreated polylactic acid fiber; weighing 35-45 parts of polyurethane fiber, placing the polyurethane fiber in 85-95 parts of shell powder, and grinding for 10-15min at the rotating speed of 1200-1800r/min to obtain the pretreated polyurethane fiber.
2. The concrete containing waste brick dust according to claim 1, wherein the waste brick dust is prepared by the following method:
crushing, cleaning and drying waste bricks to obtain powder with the particle size of 5-15mm, and performing oxygen plasma treatment on the powder for 1-2min to obtain waste brick powder.
3. The concrete containing waste brick powder according to claim 2, characterized in that the powder material is treated by oxygen plasma and then treated in mixed gas with nitrogen and methane under a pressure of 3-5MPa for 4-10min to obtain the waste brick powder.
4. The concrete containing waste brick dust according to claim 1, wherein: the modified silicon dioxide microspheres are prepared by the following method:
weighing 8-12 parts of sodium silicate solution and 35-44 parts of deionized water, mixing to obtain a mixed solution, adding cation exchange resin into the mixed solution until the pH of supernatant is =3, standing, and taking the supernatant as a silicic acid solution;
II, weighing 35-44 parts of benzyl alcohol, 1.5-2.4 parts of 1.4wt% of methyl cellulose aqueous solution, 1.6-2.3 parts of 19wt% of octyl phenol polyoxyethylene ether and 36-44 parts of silicic acid solution prepared by the step I, mixing and stirring to prepare emulsion, and carrying out vacuum rotary evaporation, suction filtration, washing and drying on the emulsion to prepare silicon dioxide microspheres;
and III, weighing 20-28 parts of the silicon dioxide microspheres prepared by the II, soaking in 55-70 parts of fluorosilane solution for 12-15h, and drying to obtain the modified silicon dioxide microspheres.
5. The concrete containing waste brick powder as claimed in claim 4, wherein the pretreated microspheres are prepared after drying in step II, 8-13 parts of the pretreated microspheres are weighed and dispersed in 90-110 parts of dilute ammonia water, the mixture is stirred for 5-15min at 75-85 ℃, and after suction filtration and washing, the effluent is neutral, and silica microspheres are prepared after vacuum drying.
6. The concrete containing waste brick powder as claimed in claim 1, wherein the admixture is composed of sodium sulfate and polycarboxylic acid water reducing agent in a weight ratio of 1: 3-4.5.
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