CN110845165A - Photocatalytic modified aggregate for self-cleaning concrete and preparation method thereof - Google Patents
Photocatalytic modified aggregate for self-cleaning concrete and preparation method thereof Download PDFInfo
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- 238000004140 cleaning Methods 0.000 title claims abstract description 77
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 75
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000002002 slurry Substances 0.000 claims abstract description 41
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 30
- 239000000725 suspension Substances 0.000 claims abstract description 24
- 239000004568 cement Substances 0.000 claims abstract description 18
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 230000000979 retarding effect Effects 0.000 claims abstract description 17
- 239000004575 stone Substances 0.000 claims abstract description 17
- 239000002562 thickening agent Substances 0.000 claims abstract description 17
- 239000002270 dispersing agent Substances 0.000 claims abstract description 15
- 239000011325 microbead Substances 0.000 claims abstract description 15
- 239000010453 quartz Substances 0.000 claims abstract description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 14
- 238000002791 soaking Methods 0.000 claims abstract description 10
- 235000012239 silicon dioxide Nutrition 0.000 claims description 20
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 239000003518 caustics Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 3
- 229920002125 Sokalan® Polymers 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 229920000609 methyl cellulose Polymers 0.000 claims description 3
- 239000001923 methylcellulose Substances 0.000 claims description 3
- 235000010981 methylcellulose Nutrition 0.000 claims description 3
- 238000007146 photocatalysis Methods 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 3
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 3
- 230000007480 spreading Effects 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 229910021487 silica fume Inorganic materials 0.000 claims 1
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 16
- 230000003247 decreasing effect Effects 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 3
- 239000011941 photocatalyst Substances 0.000 description 3
- 239000006004 Quartz sand Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007581 slurry coating method Methods 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 239000003440 toxic substance Substances 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/08—Silica
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Structural Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Catalysts (AREA)
Abstract
The invention relates to the technical field of aggregate for building concrete, and discloses a photocatalytic modified aggregate for self-cleaning concrete and a preparation method thereof. The self-cleaning photocatalytic modified aggregate for the self-cleaning concrete is prepared by cleaning the aggregate and soaking the cleaned aggregate in self-cleaning photocatalytic suspension slurry formed by micro silicon powder, nano titanium dioxide, cement, micro bead powder, quartz stone powder, a dispersing agent, a retarding water reducing agent, water and a thickening agent. The photocatalytic suspension liquid is used for integrally modifying natural mineral aggregate of a structure in concrete, and the modified concrete aggregate with the photocatalytic effect is developed, so that the contribution of the aggregate to the photocatalytic effect of the concrete in the later period can be greatly improved, and the self-cleaning performance can be continuously and effectively improved.
Description
Technical Field
The invention relates to the technical field of aggregate for building concrete, in particular to a photocatalytic modified aggregate for self-cleaning concrete and a preparation method thereof.
Background
With the rapid development of society, the rapid development of industry and automobiles enables the emission of nitrogen oxides and sulfides in the world to increase dramatically year by year, the atmospheric pollution in the world becomes more serious, and the normal life and health of human beings are seriously affected. How to effectively purify and solve the atmospheric pollutants becomes a research hotspot at home and abroad, wherein the photocatalysis technology can directly oxidize and reduce the pollutants such as nitrogen oxides and the like in the air into non-toxic substances by utilizing solar energy, has the characteristics of low preparation cost, small pollution and the like, and is one of the best self-cleaning means recognized at present.
The concrete material is a foundation construction material with the largest use amount in urban construction and development, the use of the self-cleaning concrete can effectively relieve the current urban environment and energy pollution problems, the contribution of every 100 square photocatalytic concrete to the environment is equivalent to the planting of 28 trees according to Italy research, and a safer and cleaner environment can be provided for people. However, in the preparation of the existing self-cleaning concrete, the photocatalyst is generally mixed with cement or sprayed on the surface of the concrete, and the influence of aggregate which does not have a photocatalytic effect and is exposed due to the loss of concrete slurry mixed with the photocatalyst and caused by the formation of a package on the photocatalyst by further hydration of the cement, the friction loss of a surface coating, the carbonization of the concrete, the acid corrosion of the concrete and the like in the use and conversion process cannot be continuously and effectively exerted.
The proportion of the aggregate in the traditional concrete is 3-4 times of the proportion of the slurry, and the whole surface accounts for more than 60% of the total volume, so whether the aggregate has a self-cleaning function or not has great significance on whether the concrete can effectively and continuously exert the self-cleaning function, and the existing traditional self-cleaning concrete adopts natural mineral aggregate and does not have the self-cleaning function attribute, so that the aggregate in the self-cleaning concrete is modified to have the self-cleaning function, and the continuous effective self-cleaning effect of the concrete can be further effectively improved.
Disclosure of Invention
In view of the above, the present invention provides a photocatalytic modified aggregate for self-cleaning concrete, which can greatly improve the contribution of the later aggregate to the photocatalytic effect of concrete and continuously and effectively improve the self-cleaning performance, in order to overcome at least one of the defects of the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a self-cleaning photocatalytic modified aggregate for self-cleaning concrete is prepared by cleaning an aggregate and soaking the cleaned aggregate in self-cleaning photocatalytic suspension slurry formed by micro silicon powder, nano titanium dioxide, cement, micro bead powder, quartz stone powder, a dispersing agent, a retarding water reducing agent, water and a thickening agent.
Further, the self-cleaning photocatalytic suspension slurry contains cement, micro silicon powder, nano titanium dioxide, micro bead powder, quartz stone powder, a dispersing agent, a retarding water reducing agent, water and a thickening agent in a mass ratio of 1: 0.05-0.15: 0.05-0.10: 0.10-0.20: 0.05-0.15: 0.003-0.006: 0.005-0.02: 0.25-0.4: 0.0001 to 0.0003.
Further, the aggregate has a particle diameter of not less than 2.35 mm and can be non-porous structure aggregate such as river sand, machine-made sand, quartz sand, stones and the like; the content of silicon dioxide in the micro silicon powder is not less than 85%, the activity index is more than 100%, and the average particle diameter is 0.18 um; the nano titanium dioxide is in an anatase crystal type, and the average particle diameter is 0.13 um; the cement requires above grade 42.5; the activity index of the micro-bead powder is more than 75%, and the fineness is more than 300 meshes; the fineness of the quartz stone powder is more than 800 meshes, and the content of silicon dioxide is 93%; the dispersing agent comprises one or more of sodium hexametaphosphate, polyacrylic acid and sodium dodecyl benzene sulfonate; the water reducing rate of the retarding water reducing agent is more than 30%, and the retarding time is 2-4 hours; the thickening agent is methyl cellulose.
Further, the compressive strength of a test piece prepared from the self-cleaning photocatalytic suspension slurry is not lower than 80 MPa in 28 days, the tensile strength is not lower than 3.5 MPa, and the water absorption is lower than 1%.
Furthermore, the aggregate is soaked in the self-cleaning photocatalytic suspension slurry after being cleaned, so that the surface of the aggregate has better affinity with the self-cleaning photocatalytic suspension slurry, the alkali excitation effect can be exerted, and the interface bonding strength of the aggregate and a hydrated product is improved.
Further, the average thickness of the slurry coating on the surface of the self-cleaning concrete-used photocatalytic modified aggregate is not less than 100um and not more than 800um, the coating area is not less than 95%, and the thickening agent in the slurry coating on the surface of the aggregate can play a self-maintenance role and improve the strength of the aggregate.
The preparation method of the photocatalytic modified aggregate for the self-cleaning concrete comprises the following steps:
s1, washing the aggregate with water to remove impurities such as mud and mud blocks until clear water is discharged;
s2, cleaning the aggregate treated in the step S1 with acetic acid solution with the pH value of 2-4 to remove weathered substances or corrosive substances on the surface, and circulating twice;
s3, soaking the aggregate treated in the step S2 in a sodium hydroxide solution or a potassium hydroxide solution with the pH value of 10-12, and naturally stacking and airing;
s4, adding the micro silicon powder, the nano titanium dioxide, the cement, the micro bead powder, the quartz stone powder, the dispersing agent, the retarding water reducer, the water and the thickening agent into a stirrer and stirring to form self-cleaning photocatalytic suspension slurry;
s5, placing the aggregate processed in the step S3 in the slurry obtained in the step S4, soaking to form a package, fishing out, spreading, naturally stacking, piling, sprinkling water and maintaining for 7 days after the slurry on the surface is finally solidified and slightly vibrated to be scattered into particles, and thus obtaining the photocatalytic modified aggregate.
In step S3, the surface pH of the aggregate is controlled to not less than 10.
In step S4, the concentration of the slurry is controlled to be 75-85%.
Compared with the prior art, the invention has the following beneficial effects: the invention adopts the photocatalytic suspension to carry out integral modification on the natural mineral aggregate of the structure in the concrete, develops the modified concrete aggregate with the photocatalytic effect, can greatly improve the contribution of the later aggregate to the photocatalytic effect of the concrete, and continuously and effectively improves the self-cleaning performance.
Drawings
FIG. 1 is a flow chart of a preparation process of a photocatalytic modified aggregate.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
A photocatalytic modified aggregate for self-cleaning concrete is prepared by soaking cleaned and treated aggregate with the surface pH value not lower than 10 in self-cleaning photocatalytic suspension slurry formed by micro silicon powder, nano titanium dioxide, cement, micro bead powder, quartz stone powder, a dispersing agent, a retarding water reducer, water and a thickening agent; the average coating thickness of the prepared slurry on the surface of the photocatalytic modified aggregate is not less than 100um and not more than 800um, and the coating area is not less than 95%.
Wherein the particle diameter of the aggregate is not less than 2.35 mm, and the aggregate can be non-porous structure aggregate such as river sand, machine-made sand, quartz sand, stones and the like. The self-cleaning photocatalytic suspension slurry is characterized in that the mass ratio of cement, micro silicon powder, nano titanium dioxide, micro bead powder, quartz stone powder, a dispersing agent, a retarding water reducer, water and a thickening agent is 1: 0.05: 0.05: 0.10: 0.05: 0.0003:0.005: 0.25: 0.0001. the content of silicon dioxide in the micro silicon powder is not less than 85%, the activity index is more than 100%, and the average particle diameter is 0.18 um; the nano titanium dioxide is in an anatase crystal type, and the average particle diameter is 0.13 um; the cement requires above grade 42.5; the activity index of the micro-bead powder is more than 75%, and the fineness is more than 300 meshes; the fineness of the quartz stone powder is more than 800 meshes, and the content of silicon dioxide is 93%; the dispersing agent comprises one or more of sodium hexametaphosphate, polyacrylic acid and sodium dodecyl benzene sulfonate; the water reducing rate of the retarding water reducing agent is more than 30%, and the retarding time is 2-4 hours; the thickening agent is methyl cellulose. The compressive strength of a test piece prepared from the self-cleaning photocatalytic suspension slurry is not lower than 80 MPa in 28 days, the tensile strength is not lower than 3.5 MPa, and the water absorption is lower than 1%.
The preparation method of the photocatalytic modified aggregate for the self-cleaning concrete comprises the following steps:
s1, washing the aggregate with water to remove impurities such as mud and mud blocks for 2-5 minutes until clear water is discharged;
s2, cleaning the aggregate treated in the step S1 with acetic acid solution with the pH value of 2-4 to remove weathered substances or corrosive substances on the surface for 3-5 minutes, and circulating twice;
s3, soaking the aggregate treated in the step S2 in a sodium hydroxide solution or a potassium hydroxide solution with the pH value of 10-12 for 4-10 minutes, controlling the pH value of the surface of the aggregate to be not less than 10, and naturally stacking and airing;
s4, adding the micro silicon powder, the nano titanium dioxide, the cement, the micro bead powder, the quartz stone powder, the dispersing agent, the slow-setting type water reducing agent, the water and the thickening agent into a stirrer according to a proportion, and stirring for 5-15 minutes to form self-cleaning photocatalytic suspension slurry, wherein the concentration of the slurry is controlled to be 75-85%;
s5, placing the aggregate processed in the step S3 in the slurry obtained in the step S4, soaking for 3-5 minutes to form a package, fishing out the aggregate, spreading out and naturally stacking the package, after 8-12 hours of surface slurry final setting, slightly vibrating and scattering the aggregate on a vibrating screen into particles, stacking the particles, spraying water, and curing for 7 days, so that the self-cleaning concrete can be used for preparing the self-cleaning concrete.
The photocatalysis modified aggregate for the self-cleaning concrete is used for preparing C50 self-cleaning concrete, and the C50 self-cleaning concrete comprises the following components in parts by weight:
42.5 parts of ordinary Portland cement;
60 parts of the photocatalytic modified aggregate;
40 parts of river sand with the particle size of less than 2.5 mm;
1 part of nano titanium dioxide;
0.1 part of water reducing agent;
the water-to-glue ratio is 0.2.
The preparation method of the C50 self-cleaning concrete comprises the following steps:
s6, adding the cement, the river sand, the nano titanium dioxide, the water and the water reducing agent in parts by weight into a stirrer, and stirring for 1-3 minutes to obtain stirred mortar;
s7, putting the photocatalytic modified aggregate in parts by weight into a stirrer, and stirring for 1-2 minutes to obtain the C50 self-cleaning concrete.
Example 2
This example is the same as example 1 except for the composition in parts by weight of the self-cleaning photocatalytic suspension slurry. The self-cleaning photocatalytic suspension slurry is characterized in that the mass ratio of cement, micro silicon powder, nano titanium dioxide, micro bead powder, quartz stone powder, a dispersing agent, a retarding water reducer, water and a thickening agent is 1: 0.15: 0.10: 0.20: 0.15: 0.006: 0.02: 0.4: 0.0003.
example 3
This example is the same as example 1 except for the composition in parts by weight of the self-cleaning photocatalytic suspension slurry. The self-cleaning photocatalytic suspension slurry is characterized in that the mass ratio of cement, micro silicon powder, nano titanium dioxide, micro bead powder, quartz stone powder, a dispersing agent, a retarding water reducer, water and a thickening agent is 1: 1: 0.075: 0.15: 0.10: 0.0045: 0.0125: 0.325: 0.0002.
comparative example 1
This comparative example is the same as example 1 except that the method for producing a photocatalytic modified aggregate does not include step S2.
Comparative example 2
This comparative example is the same as example 1 except that the surface pH of the aggregate in step S3 of the photocatalytic modified aggregate production method was less than 10.
Comparative example 3
This comparative example is the same as example 1 except that the slurry concentration in step S4 of the photocatalytic modified aggregate preparation method was less than 75%, and the slurry fluidity was less than 250 mm.
Comparative example 4
The comparative example is the same as example 1 except that the aggregate in the C50 self-cleaning concrete adopts common macadam with the grain diameter of 2.5-15 mm.
Comparative example 5
The comparative example is the same as example 1 except that the self-cleaning photocatalytic suspension slurry is replaced by the nano titanium dioxide dispersion liquid in the preparation method of the photocatalytic modified aggregate.
The performance test of the standard test pieces made of the C50 self-cleaning concrete prepared in the above examples 1-3 and comparative examples 1-5 was carried out, and the test results are shown in Table 1:
TABLE 1C 50 test results of self-cleaning concrete Properties
From table 1, the aggregate cleaned in the preparation method of the photocatalytic modified aggregate in the comparative example 1 does not need to be cleaned by acetic acid solution with the pH value of 2-4 for 3-5 minutes, and compared with the aggregate in the example 1, the compressive strength is slightly reduced, the photo-induced super-hydrophilicity is reduced more, and the photocatalytic activity is reduced less; comparative example 2 photocatalytic modified aggregate preparation method the pH value of the aggregate surface in step S3 was lower than 10, and compared with example 1, the compressive strength was slightly decreased, the photo-induced superhydrophilicity was more decreased, and the photocatalytic activity was less decreased; comparative example 3. the photocatalytic modified aggregate preparation method, in step S4, slurry concentration was less than 75%, slurry fluidity was less than 250mm, and as compared with example 1, compressive strength was slightly decreased, and both photo-induced superhydrophilicity and photocatalytic activity were decreased more; comparative example 4C50 the aggregate in the self-cleaning concrete adopts common macadam with the grain diameter of 2.5 mm-15 mm, compared with example 1, the compressive strength is basically unchanged, and the photo-induced super-hydrophilicity and the photo-catalytic activity are both reduced a lot; comparative example 5 the self-cleaning photocatalytic suspension slurry was replaced with the nano-titania dispersion in the preparation method of photocatalytic modified aggregate, and the compressive strength was slightly decreased, and both the photo-induced superhydrophilicity and the photocatalytic activity were decreased more than in example 1. Through a large number of tests, the concentration and the fluidity of the self-cleaning photocatalytic suspension slurry selected by the invention are optimal, and the self-cleaning performance of the self-cleaning concrete can be greatly improved by the photocatalytic modified aggregate; cleaning the surface weathered substance or corrosive substance of the cleaned aggregate by using an acetic acid solution with the pH value of 2-4 for 3-5 minutes, and circulating for 2 times, so that the influence of the weathered substance or corrosive substance on the strength of the aggregate can be reduced; the pH value of the surface of the photocatalytic modified aggregate is not lower than 10, so that the surface of the porous aggregate has better affinity with self-cleaning photocatalytic suspension slurry, and can play a role of alkali excitation and improve the interface bonding strength of the aggregate and a hydration product; the surface of the aggregate is coated with the thickening agent in the slurry, so that the self-curing effect can be achieved, and the strength of the porous aggregate is improved.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. The photocatalytic modified aggregate for the self-cleaning concrete is characterized by being prepared by cleaning the aggregate and then soaking the cleaned aggregate in self-cleaning photocatalytic suspension slurry formed by micro silicon powder, nano titanium dioxide, cement, micro bead powder, quartz stone powder, a dispersing agent, a retarding water reducing agent, water and a thickening agent.
2. The photocatalytic modified aggregate for self-cleaning concrete according to claim 1, wherein the mass ratio of cement, silica fume, nano titanium dioxide, micro bead powder, quartz stone powder, a dispersing agent, a retarding water reducing agent, water and a thickening agent in the self-cleaning photocatalytic suspended slurry is 1: 0.05-0.15: 0.05-0.10: 0.10-0.20: 0.05-0.15: 0.003-0.006: 0.005-0.02: 0.25-0.4: 0.0001 to 0.0003.
3. The photocatalytic modified aggregate for self-cleaning concrete according to claim 2, wherein the aggregate is a non-porous structure aggregate having a particle diameter of not less than 2.35 mm; the content of silicon dioxide in the micro silicon powder is not less than 85%, the activity index is more than 100%, and the average particle diameter is 0.18 um; the nano titanium dioxide is in an anatase crystal type, and the average particle diameter is 0.13 um; the cement requires above grade 42.5; the activity index of the micro-bead powder is more than 75%, and the fineness is more than 300 meshes; the fineness of the quartz stone powder is more than 800 meshes, and the content of silicon dioxide is 93%; the dispersing agent comprises one or more of sodium hexametaphosphate, polyacrylic acid and sodium dodecyl benzene sulfonate; the water reducing rate of the retarding water reducing agent is more than 30%, and the retarding time is 2-4 hours; the thickening agent is methyl cellulose.
4. The photocatalytic modified aggregate for self-cleaning concrete according to claim 1, wherein the aggregate is cleaned to have a surface pH value of not less than 10 and then soaked in the self-cleaning photocatalytic suspension slurry.
5. The photocatalytic modified aggregate for self-cleaning concrete according to claim 1, wherein the average coating thickness of slurry on the surface of the photocatalytic modified aggregate is not less than 100um and not more than 800um, and the coating area is not less than 95%.
6. A preparation method of the photocatalysis modified aggregate for the self-cleaning concrete as claimed in any one of claims 1 to 5, which is characterized by comprising the following steps:
s1, washing the aggregate with water to remove impurities such as mud and mud blocks until clear water is discharged;
s2, cleaning the aggregate treated in the step S1 with acetic acid solution with the pH value of 2-4 to remove weathered substances or corrosive substances on the surface, and circulating twice;
s3, soaking the aggregate treated in the step S2 in a sodium hydroxide solution or a potassium hydroxide solution with the pH value of 10-12, and naturally stacking and airing;
s4, adding the micro silicon powder, the nano titanium dioxide, the cement, the micro bead powder, the quartz stone powder, the dispersing agent, the retarding water reducer, the water and the thickening agent into a stirrer and stirring to form self-cleaning photocatalytic suspension slurry;
s5, placing the aggregate processed in the step S3 in the slurry obtained in the step S4, soaking to form a package, fishing out, spreading, naturally stacking, piling, sprinkling water and maintaining for 7 days after the slurry on the surface is finally solidified and slightly vibrated to be scattered into particles, and thus obtaining the photocatalytic modified aggregate.
7. The method for preparing a photocatalytic modification aggregate for self-cleaning concrete according to claim 6, wherein in step S3, the pH value of the surface of the aggregate is controlled to be not less than 10.
8. The method for preparing the photocatalytic modified aggregate for self-cleaning concrete according to claim 6, wherein in step S4, the slurry concentration is controlled to be 75-85%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112551992A (en) * | 2021-01-15 | 2021-03-26 | 福州大学 | Artificial coarse aggregate with photocatalysis effect and preparation method thereof |
| CN113233833A (en) * | 2021-01-22 | 2021-08-10 | 浙江省二建建设集团有限公司 | Preparation method of recycled aggregate colorful bare concrete hanging plate with self-cleaning function |
| CN113354359A (en) * | 2021-06-21 | 2021-09-07 | 深圳市东大洋水泥制品有限公司 | Siliceous stone powder concrete and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100946184B1 (en) * | 2009-08-31 | 2010-03-08 | 양지콘크리트(주) | Composite functional water permeability plat process and method of manufacturing the same |
| CN103708760A (en) * | 2013-12-23 | 2014-04-09 | 宁波中水科化工科技有限公司 | Slow-setting polycarboxylic acid water reducing agent and preparation method thereof |
| CN103833298A (en) * | 2014-01-17 | 2014-06-04 | 淄博环亿资源综合利用有限公司 | Slope protection material and preparation method thereof |
| CN106220102A (en) * | 2016-08-15 | 2016-12-14 | 马鞍山十七冶工程科技有限责任公司 | A kind of colored automatically cleaning self-compacting concrete and preparation method |
| CN109161299A (en) * | 2018-08-15 | 2019-01-08 | 成都新柯力化工科技有限公司 | A kind of self-cleaning architectural decoration coating material of scratch-resistant and preparation method |
-
2019
- 2019-11-15 CN CN201911121871.8A patent/CN110845165A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100946184B1 (en) * | 2009-08-31 | 2010-03-08 | 양지콘크리트(주) | Composite functional water permeability plat process and method of manufacturing the same |
| CN103708760A (en) * | 2013-12-23 | 2014-04-09 | 宁波中水科化工科技有限公司 | Slow-setting polycarboxylic acid water reducing agent and preparation method thereof |
| CN103833298A (en) * | 2014-01-17 | 2014-06-04 | 淄博环亿资源综合利用有限公司 | Slope protection material and preparation method thereof |
| CN106220102A (en) * | 2016-08-15 | 2016-12-14 | 马鞍山十七冶工程科技有限责任公司 | A kind of colored automatically cleaning self-compacting concrete and preparation method |
| CN109161299A (en) * | 2018-08-15 | 2019-01-08 | 成都新柯力化工科技有限公司 | A kind of self-cleaning architectural decoration coating material of scratch-resistant and preparation method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112551992A (en) * | 2021-01-15 | 2021-03-26 | 福州大学 | Artificial coarse aggregate with photocatalysis effect and preparation method thereof |
| CN112551992B (en) * | 2021-01-15 | 2022-03-11 | 福州大学 | Artificial coarse aggregate with photocatalysis effect and preparation method thereof |
| CN113233833A (en) * | 2021-01-22 | 2021-08-10 | 浙江省二建建设集团有限公司 | Preparation method of recycled aggregate colorful bare concrete hanging plate with self-cleaning function |
| CN113233833B (en) * | 2021-01-22 | 2022-10-11 | 浙江省二建建设集团有限公司 | Preparation method of recycled aggregate colorful bare concrete hanging plate with self-cleaning function |
| CN113354359A (en) * | 2021-06-21 | 2021-09-07 | 深圳市东大洋水泥制品有限公司 | Siliceous stone powder concrete and preparation method thereof |
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