CN111792869A - Anti-cracking concrete filler and production process thereof - Google Patents
Anti-cracking concrete filler and production process thereof Download PDFInfo
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- CN111792869A CN111792869A CN202010756806.9A CN202010756806A CN111792869A CN 111792869 A CN111792869 A CN 111792869A CN 202010756806 A CN202010756806 A CN 202010756806A CN 111792869 A CN111792869 A CN 111792869A
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- 239000000945 filler Substances 0.000 title claims abstract description 83
- 238000005336 cracking Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000002105 nanoparticle Substances 0.000 claims abstract description 63
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 54
- 238000003756 stirring Methods 0.000 claims abstract description 52
- 238000001179 sorption measurement Methods 0.000 claims abstract description 39
- 239000011259 mixed solution Substances 0.000 claims abstract description 34
- 238000002156 mixing Methods 0.000 claims abstract description 26
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 21
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 21
- 239000000839 emulsion Substances 0.000 claims abstract description 21
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 18
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims abstract description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 18
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 18
- 239000004202 carbamide Substances 0.000 claims abstract description 18
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 44
- 239000008367 deionised water Substances 0.000 claims description 38
- 229910021641 deionized water Inorganic materials 0.000 claims description 38
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 26
- 229910052799 carbon Inorganic materials 0.000 claims description 26
- 239000004005 microsphere Substances 0.000 claims description 26
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 24
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 24
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 22
- 239000001569 carbon dioxide Substances 0.000 claims description 22
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 22
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 18
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 18
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 18
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 16
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 16
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 16
- 239000005642 Oleic acid Substances 0.000 claims description 16
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 16
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 16
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000008103 glucose Substances 0.000 claims description 14
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 235000019270 ammonium chloride Nutrition 0.000 claims description 12
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 12
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000292 calcium oxide Substances 0.000 claims description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 239000000377 silicon dioxide Substances 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 12
- 238000001291 vacuum drying Methods 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 12
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 11
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000000052 comparative effect Effects 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 239000002956 ash Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 5
- 230000002209 hydrophobic effect Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 4
- 239000010881 fly ash Substances 0.000 description 3
- 239000000017 hydrogel Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000012615 aggregate Substances 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 229920003086 cellulose ether Polymers 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000003760 magnetic stirring Methods 0.000 description 2
- 239000005543 nano-size silicon particle Substances 0.000 description 2
- -1 oleic acid radical ions Chemical class 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000011863 silicon-based powder Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
Abstract
The invention discloses an anti-cracking concrete filler which is prepared from the following raw materials in parts by weight: 25-35 parts of modified nanoparticles, 30-50 parts of high-adsorption filler, 10-20 parts of sodium hydroxide, 10-15 parts of acrylic resin emulsion, 10-15 parts of ethylene oxide, 10-15 parts of urea and 5-15 parts of kaolin; adding the modified nano particles and the high-adsorption filler into the acrylic resin emulsion, uniformly mixing, heating in water bath at 40-50 ℃, and magnetically stirring for 4-5 hours to obtain a mixed solution D; sequentially adding ethylene oxide, sodium hydroxide, urea and kaolin into the mixed solution D, uniformly stirring, and circularly heating by hot air at the temperature of 80-100 ℃ for 2-3 hours to prepare a filling agent for concrete; the invention also discloses a production process of the anti-cracking concrete filler; after the prepared filler is combined with concrete, the excellent stability can be endowed to the concrete, and the anti-cracking performance of the concrete is enhanced.
Description
Technical Field
The invention belongs to the technical field of concrete preparation, and particularly relates to an anti-cracking concrete filler and a production process thereof.
Background
Cement concrete is a major material for economic construction. With the increasing expansion of the application range of concrete, the problem of performance degradation of the concrete in the natural environment is gradually revealed. The common cement concrete has high compression strength and high rigidity, but has the characteristics of easy shrinkage cracking, low tensile strength, poor toughness and the like in the process of coagulation and hardening, and has more obvious brittleness characteristic along with the improvement of the strength, thereby bringing great influence on the durability of concrete structures.
In the prior art, a large amount of fly ash and slag powder are often added to make up for some defects of concrete, but because the concrete with the large amount of fly ash and slag powder has the problems of low early strength, easy cracking and the like, the concrete has great resistance in engineering application, and in some areas, high-quality fly ash and slag powder resources are difficult to obtain.
The Chinese invention patent CN106832130A discloses a high-toughness anti-cracking cement concrete and a preparation method thereof, wherein the concrete preparation raw materials comprise cellulose ether, pH sensitive hydrogel, cement, aggregate and water. The preparation method of the concrete comprises the steps of firstly preparing the pH sensitive hydrogel, then uniformly mixing the aggregate and the cement, finally adding the cellulose ether and the pH sensitive hydrogel, and uniformly mixing to obtain the concrete.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a cracking-resistant concrete filler and a production process thereof.
The modified nano particles form a layer of hydrophobic structure, so that the modified nano particles can be prevented from agglomerating, the hydrophobicity of the modified nano particles can be enhanced, the modified nano particles can be dispersed in acrylic resin emulsion, the high-adsorption filler has high adsorption performance, the prepared filler can be combined with concrete to endow the concrete with excellent stability, the anti-cracking performance of the concrete is enhanced, and the technical problems that the nano particles are easy to agglomerate and cannot be uniformly dispersed in an organic solvent are solved.
The purpose of the invention can be realized by the following technical scheme:
the anti-cracking filler for the concrete is prepared from the following raw materials in parts by weight: 25-35 parts of modified nanoparticles, 30-50 parts of high-adsorption filler, 10-20 parts of sodium hydroxide, 10-15 parts of acrylic resin emulsion, 10-15 parts of ethylene oxide, 10-15 parts of urea and 5-15 parts of kaolin;
the anti-cracking concrete filler is prepared by the following method:
(1) adding the modified nano particles and the high-adsorption filler into the acrylic resin emulsion, uniformly mixing, heating in water bath at 40-50 ℃, and magnetically stirring for 4-5 hours to obtain a mixed solution D;
(2) and (3) sequentially adding ethylene oxide, sodium hydroxide, urea and kaolin into the mixed solution D, uniformly stirring, and circularly heating by hot air at the temperature of 80-100 ℃ for 2-3 hours to obtain the filler for the concrete.
Further, the modified nanoparticles are prepared by the following method:
step S1, sequentially adding calcium oxide and deionized water into a beaker, controlling the ash melting temperature to be 35-60 ℃, cooling for 1h to prepare slurry A, adding the slurry A into a reaction kettle, adding ammonium chloride, introducing carbon dioxide, heating in a water bath at 50-55 ℃, uniformly stirring for 30min at a rotating speed of 480r/min, detecting the pH until the pH is 6-7, centrifuging, washing and drying to prepare nano particles;
and S2, adding the nano particles prepared in the step S1 into deionized water, heating in a water bath at 70-80 ℃, uniformly stirring for 15min, adding oleic acid, continuously stirring for 2h, transferring to a vacuum drying oven at 110 ℃ for drying for 10h, controlling the vacuum degree of the vacuum drying oven to be-0.10 MPa, and preparing modified nano particles, wherein the weight ratio of the nano calcium carbonate to the deionized water to the oleic acid is controlled to be 1: 3: 0.3.
Step S1, introducing carbon dioxide, controlling the flow of the carbon dioxide to be 10-30mL/min, on one hand, controlling the carbonization rate, on the other hand, increasing the contact area of the carbon dioxide and the solution and improving the utilization rate of the carbon dioxide, then performing magnetic stirring at the rotating speed of 480r/min to break bubbles formed by the introduced gas, further increasing the contact area of the carbon dioxide and the solution and accelerating the reaction process; the nano calcium carbonate has good dispersibility in water, and in step S1, the surface of the nano calcium carbonate is modified by oleic acid, so that oleic acid radical ions and calcium ions in the system generate precipitates, and then the precipitates are covered on the surfaces of calcium carbonate particles under the action of coulomb force to form a layer of hydrophobic structure, so that on one hand, the modified nanoparticles can be prevented from self-aggregation, and on the other hand, the hydrophobicity of the modified nanoparticles can be enhanced, and the modified nanoparticles can be dispersed in an organic solvent.
Further, in the step S1, the flow rate of the carbon dioxide is controlled to be 15-30mL/min, and the weight ratio of the calcium oxide, the deionized water and the ammonium chloride is 1: 5: 0.1-0.2.
Further, the high adsorption filler is prepared by the following method:
adding glucose into deionized water, uniformly stirring, adding sodium carboxymethylcellulose, heating in a water bath at 40-45 ℃ and magnetically stirring for 30min to obtain a mixed solution B, transferring the mixed solution B into a reaction kettle, heating to 180 ℃ at a heating speed of 3-5 ℃/min, reacting for 20h at the temperature, filtering, washing with absolute ethyl alcohol for three times to obtain carbon microspheres, and controlling the weight ratio of the glucose, the sodium carboxymethylcellulose and the deionized water to be 1: 100: 0.02;
and secondly, uniformly mixing the carbon microspheres prepared in the first step with the nano-silica to prepare a mixture C, then adding sodium bicarbonate, uniformly mixing, introducing argon, heating to 750 ℃ at a heating rate of 15 ℃/min, preserving heat for 4h at the temperature, heating to 1100-1200 ℃ at a heating rate of 10 ℃/min, preserving heat for 2h, and cooling to prepare the high-adsorption filler.
Glucose is added into deionized water in the first step, sodium carboxymethyl cellulose is added later, a carbon microsphere is prepared by water bath heating, the particle size of the prepared carbon microsphere can be controlled by controlling the time and the temperature of the water bath heating, the carbon microsphere and silicon powder are mixed according to the weight ratio of 2: 1 in the second step later, sodium bicarbonate is added for continuous sectional calcination, the sodium carboxymethyl cellulose can be coated on the surfaces of the carbon microsphere and the nano silicon dioxide and can serve as a lubricant, the friction force between the formed particles is reduced, the prepared filler has high density, the sodium carboxymethyl cellulose is decomposed in the continuous temperature rising process to generate a large number of air holes, the formed filler generates air holes, the sodium bicarbonate is added, the sodium bicarbonate is decomposed, and the specific surface area of the filler can be further increased.
Furthermore, the weight ratio of the carbon microspheres, the nano silicon dioxide and the sodium bicarbonate is controlled to be 2: 1: 0.5-1.
A production process of a crack-resistant concrete filler comprises the following steps:
(1) adding the modified nano particles and the high-adsorption filler into the acrylic resin emulsion, uniformly mixing, heating in water bath at 40-50 ℃, and magnetically stirring for 4-5 hours to obtain a mixed solution D;
(2) and (3) sequentially adding ethylene oxide, sodium hydroxide, urea and kaolin into the mixed solution D, uniformly stirring, and circularly heating by hot air at the temperature of 80-100 ℃ for 2-3 hours to obtain the filler for the concrete.
The invention has the beneficial effects that:
(1) the anti-cracking filler for the concrete takes the modified nanoparticles, the high-adsorption filler and the like as raw materials, the modified nanoparticles form a layer of hydrophobic structure, on one hand, the modified nanoparticles can be prevented from agglomerating, on the other hand, the hydrophobicity of the modified nanoparticles can be enhanced, the modified nanoparticles can be dispersed in acrylic resin emulsion, the high-adsorption filler has high adsorption performance, and after the prepared filler is combined with the concrete, the concrete can be endowed with excellent stability, and the anti-cracking performance of the concrete can be enhanced; in the preparation process of the modified nanoparticles, carbon dioxide is introduced in the step S1, the flow rate of the carbon dioxide is controlled to be 10-30mL/min, on one hand, the carbonization rate can be controlled, on the other hand, the contact area of the carbon dioxide and the solution can be increased, the utilization rate of the carbon dioxide is improved, then, bubbles formed by the introduced gas can be broken up by performing magnetic stirring at the rotating speed of 480r/min, the contact area of the carbon dioxide and the solution is further increased, and the reaction process is accelerated; the nano calcium carbonate has good dispersibility in water, and in the step S1, the surface of the nano calcium carbonate is modified by oleic acid, oleic acid radical ions and calcium ions in a system generate precipitates, and then the precipitates are covered on the surfaces of calcium carbonate particles under the action of coulomb force to form a layer of hydrophobic structure, so that on one hand, the modified nanoparticles can be prevented from self-agglomerating, on the other hand, the hydrophobicity of the modified nanoparticles can be enhanced, and the modified nanoparticles can be dispersed in an organic solvent;
(2) the high-adsorption filler is prepared by adding glucose into deionized water in the first step, then adding sodium carboxymethylcellulose, preparing a carbon microsphere through water bath heating, controlling the particle size of the prepared carbon microsphere through controlling the time and temperature of the water bath heating, then mixing the carbon microsphere and silicon powder according to the weight ratio of 2: 1 in the second step, then adding sodium bicarbonate to continuously calcine in a segmented manner, wherein the sodium carboxymethylcellulose can coat the surfaces of the carbon microsphere and the nano-silica and can serve as a lubricant, so that the friction force between the formed particles is reduced, the prepared filler has high density, and the sodium carboxymethylcellulose is decomposed by itself in the continuous heating process to generate a large number of pores, so that the formed filler generates pores, and the sodium bicarbonate is added and decomposed by itself to further increase the specific surface area of the filler, endows the product with excellent adsorption performance.
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.
Example 1
The anti-cracking filler for the concrete is prepared from the following raw materials in parts by weight: 25 parts of modified nanoparticles, 30 parts of high-adsorption filler, 10 parts of sodium hydroxide, 10 parts of acrylic resin emulsion, 10 parts of ethylene oxide, 15 parts of urea and 5 parts of kaolin;
the anti-cracking concrete filler is prepared by the following method:
(1) adding the modified nano particles and the high-adsorption filler into the acrylic resin emulsion, uniformly mixing, heating in water bath at 40 ℃, and magnetically stirring for 4 hours to obtain a mixed solution D;
(2) and (3) sequentially adding ethylene oxide, sodium hydroxide, urea and kaolin into the mixed solution D, uniformly stirring, and circularly heating by hot air at the temperature of 80 ℃ for 2 hours to obtain the filling agent for the concrete.
The modified nanoparticles are prepared by the following method:
step S1, sequentially adding calcium oxide and deionized water into a beaker, controlling the ash melting temperature to be 50 ℃, cooling for 1h to prepare slurry A, adding the slurry A into a reaction kettle, adding ammonium chloride, introducing carbon dioxide, heating in a water bath at 50 ℃, uniformly stirring for 30min at a rotating speed of 480r/min, detecting the pH until the pH is 6, centrifuging, washing and drying to prepare nano particles, controlling the flow of the carbon dioxide to be 15mL/min, and controlling the weight ratio of the calcium oxide, the deionized water and the ammonium chloride to be 1: 5: 0.1;
and S2, adding the nano particles prepared in the step S1 into deionized water, heating in a water bath at 70 ℃, uniformly stirring for 15min, adding oleic acid, continuously stirring for 2h, transferring to a vacuum drying oven at 110 ℃ for drying for 10h, controlling the vacuum degree of the vacuum drying oven to be-0.10 MPa, and preparing modified nano particles, wherein the weight ratio of the nano calcium carbonate to the deionized water to the oleic acid is controlled to be 1: 3: 0.3.
The high adsorption filler is prepared by the following method:
adding glucose into deionized water, uniformly stirring, adding sodium carboxymethylcellulose, heating in a water bath at 40 ℃ and magnetically stirring for 30min to obtain a mixed solution B, transferring the mixed solution B into a reaction kettle, heating to 180 ℃ at a heating rate of 3 ℃/min, reacting for 20h at the temperature, filtering, washing with absolute ethyl alcohol for three times to obtain carbon microspheres, and controlling the weight ratio of the glucose, the sodium carboxymethylcellulose and the deionized water to be 1: 100: 0.02;
and secondly, uniformly mixing the carbon microspheres prepared in the first step with the nano-silica to prepare a mixture C, then adding sodium bicarbonate, uniformly mixing, introducing argon, heating to 750 ℃ at a heating rate of 15 ℃/min, preserving heat for 4h at the temperature, heating to 1100 ℃ at a heating rate of 10 ℃/min, preserving heat for 2h, cooling to prepare the high-adsorption filler, and controlling the weight ratio of the carbon microspheres to the nano-silica to the sodium bicarbonate to be 2: 1.
Example 2
The anti-cracking filler for the concrete is prepared from the following raw materials in parts by weight: 28 parts of modified nanoparticles, 35 parts of high-adsorption filler, 12 parts of sodium hydroxide, 12 parts of acrylic resin emulsion, 12 parts of ethylene oxide, 11 parts of urea and 8 parts of kaolin;
the anti-cracking concrete filler is prepared by the following method:
(1) adding the modified nano particles and the high-adsorption filler into the acrylic resin emulsion, uniformly mixing, heating in water bath at 40 ℃, and magnetically stirring for 4 hours to obtain a mixed solution D;
(2) and (3) sequentially adding ethylene oxide, sodium hydroxide, urea and kaolin into the mixed solution D, uniformly stirring, and circularly heating by hot air at the temperature of 80 ℃ for 2 hours to obtain the filling agent for the concrete.
The modified nanoparticles are prepared by the following method:
step S1, sequentially adding calcium oxide and deionized water into a beaker, controlling the ash melting temperature to be 50 ℃, cooling for 1h to prepare slurry A, adding the slurry A into a reaction kettle, adding ammonium chloride, introducing carbon dioxide, heating in a water bath at 50 ℃, uniformly stirring for 30min at a rotating speed of 480r/min, detecting the pH until the pH is 6, centrifuging, washing and drying to prepare nano particles, controlling the flow of the carbon dioxide to be 15mL/min, and controlling the weight ratio of the calcium oxide, the deionized water and the ammonium chloride to be 1: 5: 0.1;
and S2, adding the nano particles prepared in the step S1 into deionized water, heating in a water bath at 70 ℃, uniformly stirring for 15min, adding oleic acid, continuously stirring for 2h, transferring to a vacuum drying oven at 110 ℃ for drying for 10h, controlling the vacuum degree of the vacuum drying oven to be-0.10 MPa, and preparing modified nano particles, wherein the weight ratio of the nano calcium carbonate to the deionized water to the oleic acid is controlled to be 1: 3: 0.3.
The high adsorption filler is prepared by the following method:
adding glucose into deionized water, uniformly stirring, adding sodium carboxymethylcellulose, heating in a water bath at 40 ℃ and magnetically stirring for 30min to obtain a mixed solution B, transferring the mixed solution B into a reaction kettle, heating to 180 ℃ at a heating rate of 3 ℃/min, reacting for 20h at the temperature, filtering, washing with absolute ethyl alcohol for three times to obtain carbon microspheres, and controlling the weight ratio of the glucose, the sodium carboxymethylcellulose and the deionized water to be 1: 100: 0.02;
and secondly, uniformly mixing the carbon microspheres prepared in the first step with the nano-silica to prepare a mixture C, then adding sodium bicarbonate, uniformly mixing, introducing argon, heating to 750 ℃ at a heating rate of 15 ℃/min, preserving heat for 4h at the temperature, heating to 1100 ℃ at a heating rate of 10 ℃/min, preserving heat for 2h, cooling to prepare the high-adsorption filler, and controlling the weight ratio of the carbon microspheres to the nano-silica to the sodium bicarbonate to be 2: 1.
Example 3
The anti-cracking filler for the concrete is prepared from the following raw materials in parts by weight: 30 parts of modified nanoparticles, 45 parts of high-adsorption filler, 18 parts of sodium hydroxide, 14 parts of acrylic resin emulsion, 14 parts of ethylene oxide, 14 parts of urea and 12 parts of kaolin;
the anti-cracking concrete filler is prepared by the following method:
(1) adding the modified nano particles and the high-adsorption filler into the acrylic resin emulsion, uniformly mixing, heating in water bath at 40 ℃, and magnetically stirring for 4 hours to obtain a mixed solution D;
(2) and (3) sequentially adding ethylene oxide, sodium hydroxide, urea and kaolin into the mixed solution D, uniformly stirring, and circularly heating by hot air at the temperature of 80 ℃ for 2 hours to obtain the filling agent for the concrete.
The modified nanoparticles are prepared by the following method:
step S1, sequentially adding calcium oxide and deionized water into a beaker, controlling the ash melting temperature to be 50 ℃, cooling for 1h to prepare slurry A, adding the slurry A into a reaction kettle, adding ammonium chloride, introducing carbon dioxide, heating in a water bath at 50 ℃, uniformly stirring for 30min at a rotating speed of 480r/min, detecting the pH until the pH is 6, centrifuging, washing and drying to prepare nano particles, controlling the flow of the carbon dioxide to be 15mL/min, and controlling the weight ratio of the calcium oxide, the deionized water and the ammonium chloride to be 1: 5: 0.1;
and S2, adding the nano particles prepared in the step S1 into deionized water, heating in a water bath at 70 ℃, uniformly stirring for 15min, adding oleic acid, continuously stirring for 2h, transferring to a vacuum drying oven at 110 ℃ for drying for 10h, controlling the vacuum degree of the vacuum drying oven to be-0.10 MPa, and preparing modified nano particles, wherein the weight ratio of the nano calcium carbonate to the deionized water to the oleic acid is controlled to be 1: 3: 0.3.
The high adsorption filler is prepared by the following method:
adding glucose into deionized water, uniformly stirring, adding sodium carboxymethylcellulose, heating in a water bath at 40 ℃ and magnetically stirring for 30min to obtain a mixed solution B, transferring the mixed solution B into a reaction kettle, heating to 180 ℃ at a heating rate of 3 ℃/min, reacting for 20h at the temperature, filtering, washing with absolute ethyl alcohol for three times to obtain carbon microspheres, and controlling the weight ratio of the glucose, the sodium carboxymethylcellulose and the deionized water to be 1: 100: 0.02;
and secondly, uniformly mixing the carbon microspheres prepared in the first step with the nano-silica to prepare a mixture C, then adding sodium bicarbonate, uniformly mixing, introducing argon, heating to 750 ℃ at a heating rate of 15 ℃/min, preserving heat for 4h at the temperature, heating to 1100 ℃ at a heating rate of 10 ℃/min, preserving heat for 2h, cooling to prepare the high-adsorption filler, and controlling the weight ratio of the carbon microspheres to the nano-silica to the sodium bicarbonate to be 2: 1.
Example 4
The anti-cracking filler for the concrete is prepared from the following raw materials in parts by weight: 35 parts of modified nanoparticles, 50 parts of high-adsorption filler, 20 parts of sodium hydroxide, 15 parts of acrylic resin emulsion, 15 parts of ethylene oxide, 15 parts of urea and 15 parts of kaolin;
the anti-cracking concrete filler is prepared by the following method:
(1) adding the modified nano particles and the high-adsorption filler into the acrylic resin emulsion, uniformly mixing, heating in water bath at 40 ℃, and magnetically stirring for 4 hours to obtain a mixed solution D;
(2) and (3) sequentially adding ethylene oxide, sodium hydroxide, urea and kaolin into the mixed solution D, uniformly stirring, and circularly heating by hot air at the temperature of 80 ℃ for 2 hours to obtain the filling agent for the concrete.
The modified nanoparticles are prepared by the following method:
step S1, sequentially adding calcium oxide and deionized water into a beaker, controlling the ash melting temperature to be 50 ℃, cooling for 1h to prepare slurry A, adding the slurry A into a reaction kettle, adding ammonium chloride, introducing carbon dioxide, heating in a water bath at 50 ℃, uniformly stirring for 30min at a rotating speed of 480r/min, detecting the pH until the pH is 6, centrifuging, washing and drying to prepare nano particles, controlling the flow of the carbon dioxide to be 15mL/min, and controlling the weight ratio of the calcium oxide, the deionized water and the ammonium chloride to be 1: 5: 0.1;
and S2, adding the nano particles prepared in the step S1 into deionized water, heating in a water bath at 70 ℃, uniformly stirring for 15min, adding oleic acid, continuously stirring for 2h, transferring to a vacuum drying oven at 110 ℃ for drying for 10h, controlling the vacuum degree of the vacuum drying oven to be-0.10 MPa, and preparing modified nano particles, wherein the weight ratio of the nano calcium carbonate to the deionized water to the oleic acid is controlled to be 1: 3: 0.3.
The high adsorption filler is prepared by the following method:
adding glucose into deionized water, uniformly stirring, adding sodium carboxymethylcellulose, heating in a water bath at 40 ℃ and magnetically stirring for 30min to obtain a mixed solution B, transferring the mixed solution B into a reaction kettle, heating to 180 ℃ at a heating rate of 3 ℃/min, reacting for 20h at the temperature, filtering, washing with absolute ethyl alcohol for three times to obtain carbon microspheres, and controlling the weight ratio of the glucose, the sodium carboxymethylcellulose and the deionized water to be 1: 100: 0.02;
and secondly, uniformly mixing the carbon microspheres prepared in the first step with the nano-silica to prepare a mixture C, then adding sodium bicarbonate, uniformly mixing, introducing argon, heating to 750 ℃ at a heating rate of 15 ℃/min, preserving heat for 4h at the temperature, heating to 1100 ℃ at a heating rate of 10 ℃/min, preserving heat for 2h, cooling to prepare the high-adsorption filler, and controlling the weight ratio of the carbon microspheres to the nano-silica to the sodium bicarbonate to be 2: 1.
Comparative example 1
Compared with example 1, the preparation method of the comparative example without adding the modified nanoparticles is as follows:
the anti-cracking concrete filler is prepared by the following method:
(1) adding the high-adsorption filler into the acrylic resin emulsion, uniformly mixing, heating in a water bath at 40 ℃, and magnetically stirring for 4 hours to obtain a mixed solution D;
(2) and (3) sequentially adding ethylene oxide, sodium hydroxide, urea and kaolin into the mixed solution D, uniformly stirring, and circularly heating by hot air at the temperature of 80 ℃ for 2 hours to obtain the filling agent for the concrete.
Comparative example 2
Compared with example 1, the preparation method of the comparative example is as follows without adding high adsorption filler:
(1) adding the modified nanoparticles into the acrylic resin emulsion, uniformly mixing, heating in water bath at 40 ℃, and magnetically stirring for 4 hours to obtain a mixed solution D;
(2) and (3) sequentially adding ethylene oxide, sodium hydroxide, urea and kaolin into the mixed solution D, uniformly stirring, and circularly heating by hot air at the temperature of 80 ℃ for 2 hours to obtain the filling agent for the concrete.
Comparative example 3
The comparative example is a concrete filler in the prior art.
The concrete was added to examples 1 to 4 and comparative examples 1 to 3 in the order of 90g per cubic unit to prepare test blocks, which were designated as S1, S2, S3, S4, S5, S6 and S7 in the order, and their properties were measured, with the results shown in the following table;
from the above table, it can be seen that the compressive strength of S1-S4 after 7 days of curing is 15.3-16.2MPa, the flexural strength is 3.10-3.12MPa, the compressive strength of S5-S7 is 12.8-13.6MPa, and the flexural strength is 2.86-2.97 MPa; after 28 days of curing, the compressive strength of S1-S4 is 33.2-34.1MPa, the breaking strength is 5.60-5.65MPa, the compressive strength of S5-S7 is 28.0-31.8MPa, and the breaking strength is 4.30-4.96 MPa. Therefore, the modified nanoparticles form a hydrophobic structure, so that the modified nanoparticles can be prevented from agglomerating, the hydrophobicity of the modified nanoparticles can be enhanced, the modified nanoparticles can be dispersed in acrylic resin emulsion, the high-adsorption filler has high adsorption performance, and the prepared filler can be combined with concrete to endow the concrete with excellent stability and enhance the anti-cracking performance of the concrete.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (6)
1. The anti-cracking filler for the concrete is characterized by being prepared from the following raw materials in parts by weight: 25-35 parts of modified nanoparticles, 30-50 parts of high-adsorption filler, 10-20 parts of sodium hydroxide, 10-15 parts of acrylic resin emulsion, 10-15 parts of ethylene oxide, 10-15 parts of urea and 5-15 parts of kaolin;
the anti-cracking concrete filler is prepared by the following method:
(1) adding the modified nano particles and the high-adsorption filler into the acrylic resin emulsion, uniformly mixing, heating in water bath at 40-50 ℃, and magnetically stirring for 4-5 hours to obtain a mixed solution D;
(2) and (3) sequentially adding ethylene oxide, sodium hydroxide, urea and kaolin into the mixed solution D, uniformly stirring, and circularly heating by hot air at the temperature of 80-100 ℃ for 2-3 hours to obtain the filler for the concrete.
2. The filling agent for anti-cracking concrete according to claim 1, wherein the modified nanoparticles are prepared by the following method:
step S1, sequentially adding calcium oxide and deionized water into a beaker, controlling the ash melting temperature to be 35-60 ℃, cooling for 1h to prepare slurry A, adding the slurry A into a reaction kettle, adding ammonium chloride, introducing carbon dioxide, heating in a water bath at 50-55 ℃, uniformly stirring for 30min at a rotating speed of 480r/min, detecting the pH until the pH is 6-7, centrifuging, washing and drying to prepare nano particles;
and S2, adding the nano particles prepared in the step S1 into deionized water, heating in a water bath at 70-80 ℃, uniformly stirring for 15min, adding oleic acid, continuously stirring for 2h, transferring to a vacuum drying oven at 110 ℃ for drying for 10h, controlling the vacuum degree of the vacuum drying oven to be-0.10 MPa, and preparing modified nano particles, wherein the weight ratio of the nano calcium carbonate to the deionized water to the oleic acid is controlled to be 1: 3: 0.3.
3. The filling agent for anti-cracking concrete according to claim 2, wherein the flow rate of carbon dioxide is controlled to be 15-30mL/min in step S1, and the weight ratio of calcium oxide, deionized water and ammonium chloride is 1: 5: 0.1-0.2.
4. The filling agent for crack-resistant concrete according to claim 1, wherein the high-adsorption filler is prepared by the following method:
adding glucose into deionized water, uniformly stirring, adding sodium carboxymethylcellulose, heating in a water bath at 40-45 ℃ and magnetically stirring for 30min to obtain a mixed solution B, transferring the mixed solution B into a reaction kettle, heating to 180 ℃ at a heating speed of 3-5 ℃/min, reacting for 20h at the temperature, filtering, washing with absolute ethyl alcohol for three times to obtain carbon microspheres, and controlling the weight ratio of the glucose, the sodium carboxymethylcellulose and the deionized water to be 1: 100: 0.02;
and secondly, uniformly mixing the carbon microspheres prepared in the first step with the nano-silica to prepare a mixture C, then adding sodium bicarbonate, uniformly mixing, introducing argon, heating to 750 ℃ at a heating rate of 15 ℃/min, preserving heat for 4h at the temperature, heating to 1100-1200 ℃ at a heating rate of 10 ℃/min, preserving heat for 2h, and cooling to prepare the high-adsorption filler.
5. The anti-cracking concrete filler according to claim 4, wherein the weight ratio of the carbon microspheres, the nano silica and the sodium bicarbonate is controlled to be 2: 1: 0.5-1.
6. A process for producing a crack resistant filler for concrete according to claim 1, comprising the steps of:
(1) adding the modified nano particles and the high-adsorption filler into the acrylic resin emulsion, uniformly mixing, heating in water bath at 40-50 ℃, and magnetically stirring for 4-5 hours to obtain a mixed solution D;
(2) and (3) sequentially adding ethylene oxide, sodium hydroxide, urea and kaolin into the mixed solution D, uniformly stirring, and circularly heating by hot air at the temperature of 80-100 ℃ for 2-3 hours to obtain the filler for the concrete.
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| CN112625555A (en) * | 2020-12-17 | 2021-04-09 | 安徽强旭塑业科技有限公司 | Wear-resistant coating for surface of battery jar shell and preparation method thereof |
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