CN112592111A - Luminous geopolymer mortar for building exterior wall - Google Patents
Luminous geopolymer mortar for building exterior wall Download PDFInfo
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- CN112592111A CN112592111A CN202011418424.1A CN202011418424A CN112592111A CN 112592111 A CN112592111 A CN 112592111A CN 202011418424 A CN202011418424 A CN 202011418424A CN 112592111 A CN112592111 A CN 112592111A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mineral polymers, e.g. geopolymers of the Davidovits type
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/80—Optical properties, e.g. transparency or reflexibility
- C04B2111/807—Luminescent or fluorescent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention discloses a luminous geopolymer mortar for building exterior walls, which comprises the following raw materials in parts by weight: 20-30 parts of metakaolin, 30-50 parts of alkali activator, 10-15 parts of luminescent powder, 20-30 parts of glass sand, 10-15 parts of glass powder, 1-3 parts of glass fiber and 6.7-13.6 parts of mixed auxiliary agent. The luminous geopolymer mortar for the building outer wall, which is provided by the technical scheme, is beneficial to improving the luminous intensity of the luminous geopolymer mortar and prolonging the rest glow time, and can effectively ensure that the luminous geopolymer mortar has better tensile strength so as to overcome the defects in the prior art.
Description
Technical Field
The invention relates to the technical field of geopolymer materials, in particular to luminous geopolymer mortar for building exterior walls.
Background
Mortar is a bonding substance used for building bricks on buildings, is also used for exterior wall painting and exterior wall decoration, and is formed by adding water into sand and cementing materials according to a certain proportion, is also called mortar and is also used as mortar. The luminous mortar is characterized in that a luminous material is doped in the mortar, light absorption and energy storage are carried out through the luminous material under the irradiation of a light source, and when the light source is removed, the long-afterglow luminous material slowly releases light energy to achieve the self-luminous effect.
The luminescent mortar in the prior art is luminescent cement mortar. The luminous cement mortar has a compact structure, and only a little luminous materials on the surface of the cement mortar can perform the functions of light absorption and light release under the irradiation of light. The compact cement mortar structure enables light to reach the inside of the cement mortar through the surface layer, the luminescent material is excited to absorb light, and the luminescent material can not be emitted through the surface layer of the cement mortar, so that most of the luminescent material can not play a role; meanwhile, the cement is black particles, is darker in color, and has the functions of absorbing and shielding light rays of the luminescent material. Therefore, for the above reasons, the luminance and the afterglow time of the luminous cement mortar product cannot be solved.
Disclosure of Invention
The invention aims to provide the luminescent geopolymer mortar for the building outer wall, which is beneficial to improving the luminescent intensity of the luminescent geopolymer mortar and prolonging the rest glow time, and can effectively ensure that the luminescent geopolymer mortar has better tensile strength so as to overcome the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the light-emitting geopolymer mortar for the building exterior wall comprises the following raw materials in parts by weight: 20-30 parts of metakaolin, 30-50 parts of alkali activator, 10-15 parts of luminescent powder, 20-30 parts of glass sand, 10-15 parts of glass powder, 1-3 parts of glass fiber and 6.7-13.6 parts of mixed auxiliary agent.
Preferably, the calcination temperature of the metakaolin is 600-700 ℃.
Preferably, the alkali activator comprises a potassium silicate solution and a sodium silicate solution, and the mixing ratio of the potassium silicate solution to the sodium silicate solution is (9-11): (10-11).
Preferably, the modulus of the potassium silicate solution is 2.0-2.1, and the modulus of the sodium silicate solution is 1.8-2.0.
Preferably, the metakaolin and the alkali activator are added in a ratio of 3: 4.
preferably, the fineness of the glass sand is 10-16 meshes, and the fineness of the glass powder is 25-50 meshes.
Preferably, the fineness of the metakaolin is 300-1000 meshes.
Preferably, the luminescent powder is strontium aluminate series long afterglow luminescent powder, and the fineness of the luminescent powder is 100-250 meshes.
Preferably, the feed comprises the following raw materials in parts by weight: 20-30 parts of metakaolin, 30-50 parts of alkali activator, 10-15 parts of luminescent powder, 20-30 parts of glass sand, 10-15 parts of glass powder, 1-3 parts of glass fiber, 0.2-0.6 part of anti-settling agent, 1.5-5 parts of dispersing agent and 5-8 parts of curing agent.
Preferably, the anti-settling agent is cellulose ether, the dispersing agent is nano silicon dioxide, and the curing agent is diethylenetriamine.
The invention has the beneficial effects that:
1. the technical scheme utilizes the characteristic that alkali-activated metakaolin geopolymer has certain light transmittance under a specific raw material proportion to prepare the luminous geopolymer mortar capable of improving luminous intensity and prolonging afterglow time. Compared with the traditional luminous cement mortar, the luminous cement mortar has better luminous effect.
2. According to the technical scheme, glass sand, glass powder and glass fibers are introduced into the formula, and all belong to aggregates in the luminous geopolymer mortar, so that on one hand, the addition of the vitreous aggregates plays a role in supporting a framework, the volume shrinkage of slurry can be effectively limited, and the cracking risk is reduced; on the other hand, the vitreous aggregate also plays a role of a light-emitting channel, and the added vitreous glass material can effectively transmit light rays emitted by the luminescent powder particles, so that the luminescent effect is favorably improved.
3. According to the technical scheme, the using amounts of the three vitreous aggregates are controlled together, and a synergistic effect is generated between the three vitreous aggregates, so that the mechanical property and the luminous effect of the mortar can be effectively ensured, and the fluidity and the constructability of the mortar can be favorably ensured.
4. According to the technical scheme, metakaolin with the calcination temperature of 600-700 ℃ is further preferably used as a luminescent geopolymer mortar raw material, so that the luminescent effect of a mortar product is further improved.
5. According to the technical scheme, the mixed solution of the potassium silicate solution and the sodium silicate solution is used as the alkali activator, and as the diameter of potassium ions is larger than that of sodium ions, larger gaps are easily generated during potassium ion filling, so that a silicon-oxygen tetrahedron and an aluminum-oxygen tetrahedron are embedded mutually, and the rest gaps are filled by the sodium ions, so that a more compact three-dimensional space network structure can be formed, and the mechanical property of a mortar product is further improved.
Detailed Description
The luminescent mortar in the prior art is luminescent cement mortar. The luminous cement mortar has a compact structure, and only a little luminous materials on the surface of the cement mortar can perform the functions of light absorption and light release under the irradiation of light. The compact cement mortar structure enables light to reach the inside of the cement mortar through the surface layer, the luminescent material is excited to absorb light, and the luminescent material can not be emitted through the surface layer of the cement mortar, so that most of the luminescent material can not play a role; meanwhile, the cement is black particles, is darker in color, and has the functions of absorbing and shielding light rays of the luminescent material.
In order to improve the luminous intensity of the luminous geopolymer mortar and prolong the rest glow time, the technical scheme provides the luminous geopolymer mortar for the building outer wall, which comprises the following raw materials in parts by weight: 20-30 parts of metakaolin, 30-50 parts of alkali activator, 10-15 parts of luminescent powder, 20-30 parts of glass sand, 10-15 parts of glass powder, 1-3 parts of glass fiber and 6.7-13.6 parts of mixed auxiliary agent.
Specifically, the alkali-activated geopolymer is a green environment-friendly material, and has low production energy consumption and low carbon dioxide emission; meanwhile, the strength and the rigidity of the geopolymer can be compared favorably with those of cement, the early strength of the geopolymer can be quickly increased under the alkali excitation condition, and the defects of poor corrosion resistance and fatigue resistance of common cement concrete materials can be effectively overcome. There are many kinds of alkali-activated geopolymers, such as alkali-activated fly ash geopolymer, alkali-activated fine ore geopolymer, or alkali-activated metakaolin geopolymer. However, because different raw materials have different structures of products of polycondensation reaction under the action of the alkali activator, in the alkali-activated geopolymer, a white hardened body with a certain semi-transparent effect can be formed in the hardening process only under the condition that the alkali-activated metakaolin geopolymer is prepared according to a specific raw material proportion. The technical scheme utilizes the characteristic that the alkali-activated metakaolin geopolymer has certain light transmittance under a specific raw material ratio to prepare the luminous geopolymer mortar capable of improving luminous intensity and prolonging afterglow time. Specifically, the technical scheme limits the adding amount of the metakaolin to 20-30 parts and the adding amount of the alkali activator to 30-50 parts, and the metakaolin and the alkali activator act together to be beneficial to forming a white hardening body with a semi-transparent effect in the curing process of the geopolymer, so that the light-emitting powder is shielded and absorbed less, and the light-emitting performance is better.
The luminescent powder plays a role in luminescence in the luminescent geopolymer mortar for the building exterior wall, and in order to ensure that the luminescent geopolymer mortar has better mechanical property and luminescent effect, the addition amount of the luminescent powder is limited to 10-15 parts by the technical scheme. Specifically, when the addition amount of the luminescent powder is low, the luminescent mortar has weak luminescent intensity and short afterglow time. Because the contact surface (called as an interface area) between the surface of the luminescent powder particles and the cementing material is a weak area of alkali-excited geopolymer due to poor bonding performance, and is also an induction area of internal microcracks after the mortar product is hardened; at the same time, the interface region is also a weak region of destruction under the action of external force. Therefore, when the addition amount of the luminescent powder in the formula is larger, the area of the interface area between the luminescent powder particles and the cementing material is increased, and the area of the weak area is enlarged, so that the occurrence and the development of the alkali-activated geopolymer internal microcracks are accelerated.
Since the alkali-activated polymer undergoes polycondensation during the curing process, it shrinks in volume to some extent after curing. According to the technical scheme, glass sand, glass powder and glass fibers are introduced into the formula, and all belong to aggregates in the luminous geopolymer mortar, so that on one hand, the addition of the vitreous aggregates plays a role in supporting a framework, the volume shrinkage of slurry can be effectively limited, and the cracking risk is reduced; on the other hand, the vitreous aggregate also plays a role of a light-emitting channel, and the added vitreous glass material can effectively transmit light rays emitted by the luminescent powder particles, so that the luminescent effect is favorably improved. According to the technical scheme, the using amounts of the three vitreous aggregates are controlled together, and a synergistic effect is generated between the three vitreous aggregates, so that the mechanical property and the luminous effect of the mortar can be effectively ensured, and the fluidity and the constructability of the mortar can be favorably ensured.
Furthermore, the calcination temperature of the metakaolin is 600-700 ℃.
Metakaolin is a transition phase with poor crystallinity formed after kaolin is calcined at 600-1000 ℃, has irregular molecular arrangement, is in a stable state in thermodynamic engineering and has high chemical activity. Therefore, when the calcination temperature of kaolin is too low or too high, the formed molecular structure has no chemical activity, and the kaolin cannot be used as an alkali-activated cementing material to prepare a geopolymer product with certain strength. In addition, because metakaolin with different calcination temperatures also has different molecular crystal forms, in order to ensure that the excited material has certain light transmittance, metakaolin with the calcination temperature of 600-700 ℃ is further preferably selected as a luminescent geopolymer mortar raw material in the technical scheme, so that the luminescent effect of the mortar product is favorably further improved.
Further, the alkali activator comprises a potassium silicate solution and a sodium silicate solution, and the mixing ratio of the potassium silicate solution to the sodium silicate solution is (9-11): (10-11).
The principle of the condensation polymerization reaction of the alkali-activated geopolymer is that metakaolin is firstly dissolved under the action of an alkali activator, then is hydrated and condensed to form gel which is composed of silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron and has a spatial three-dimensional network-shaped bonding structure, and cations of the alkali activator are filled between the silicon-oxygen tetrahedron and the aluminum-oxygen tetrahedron to play a role in connection. According to the technical scheme, the mixed solution of the potassium silicate solution and the sodium silicate solution is used as the alkali activator, and as the diameter of potassium ions is larger than that of sodium ions, larger gaps are easily generated during potassium ion filling, so that a silicon-oxygen tetrahedron and an aluminum-oxygen tetrahedron are embedded mutually, and the rest gaps are filled by the sodium ions, so that a more compact three-dimensional space network structure can be formed, and the mechanical property of a mortar product is further improved.
Furthermore, the technical scheme controls the mixing ratio of the potassium silicate solution and the sodium silicate solution to be (9-11): (10-11) is beneficial to ensuring that a compact space three-dimensional network structure is formed in the geopolymer. As a preferred embodiment of the present technical solution, the mixing ratio of the potassium silicate solution and the sodium silicate solution is 9: 11.
further, the modulus of the potassium silicate solution is 2.0 to 2.1, and the modulus of the sodium silicate solution is 1.8 to 2.0.
The modulus of the alkali activator directly affects the strength and cracking performance of the geopolymer, and as the modulus increases, the strength of the geopolymer increases and then decreases. In order to ensure the mechanical property of the mortar product, the technical scheme limits the modulus of a potassium silicate solution to be 2.0-2.1, and the modulus of a sodium silicate solution to be 1.8-2.0.
As a preferred embodiment of the present invention, the modulus of the potassium silicate solution is 2.0, and the modulus of the sodium silicate solution is 1.8.
Further, according to the mass ratio, the addition ratio of the metakaolin to the alkali-activator is 3: 4.
since the alkali-activated polymer undergoes polycondensation during the curing process, it shrinks in volume to some extent after curing. In the research process, the inventor analyzes the corresponding relation between the raw material ratio of the luminescent geopolymer mortar for the building exterior wall and the volume shrinkage of the mortar, and the result shows that when the addition ratio of the metakaolin to the alkali activator is 3: and 4, the volume shrinkage rate of the slurry is minimum, so that the mechanical property of the mortar product is stabilized, and cracking is prevented.
Further, the fineness of the glass sand is 10-16 meshes, and the fineness of the glass powder is 25-50 meshes.
The glass sand and glass powder of the luminous geopolymer mortar in the technical scheme can be used as a channel material for light transmission in the coating to improve the brightness and afterglow time of the luminous coating, and can inhibit the volume shrinkage of the coating after curing. In order to play the role balance of the two aspects of the glass sand and the glass powder, the fineness of the glass sand is limited to 10-16 meshes, the fineness of the glass powder is limited to 25-50 meshes, if the particles of the glass sand and the glass powder are too coarse, stable and uniform slurry cannot be formed, the surface of a coated product is not smooth and uniform, and the brightness and the afterglow time of the luminous geopolymer mortar are easily influenced; if the particles of the glass sand and the glass powder are too fine, the supporting effect on the slurry is not good, the volume of the hardened mortar is easy to shrink and crack, the mechanical property is not easy to realize, and meanwhile, the better light transmission effect cannot be achieved.
In addition, the glass sand, the glass powder and the glass fiber with different fineness are configured, so that the vitreous aggregate in the slurry forms grain size grading, and the fluidity and the construction property of the mortar are ensured.
Further, the fineness of the metakaolin is 300-1000 meshes.
In one embodiment of the technical scheme, the fineness of the metakaolin is 300-1000 meshes, and the metakaolin with smaller granularity is beneficial to more sufficient polycondensation reaction among alkali-activated geopolymers, so that a more compact spatial three-dimensional network structure is formed among reactants participating in the reaction to the greatest extent, and the mechanical property of a mortar product is further improved. As a preferred embodiment of the present invention, the fineness of the metakaolin is 500 mesh.
Further, the luminescent powder is strontium aluminate series long afterglow luminescent powder, and the fineness of the luminescent powder is 100-250 meshes.
In one embodiment of the technical scheme, the luminescent powder adopts strontium aluminate series long afterglow luminescent powder, compared with luminescent materials of other systems, the strontium aluminate series luminescent powder adopted by the technical scheme has good luminescent effect, high brightness, long afterglow time and reasonable price, and is added into luminescent geopolymer mortar, thereby being beneficial to wide popularization and application of the coating.
Further, the feed comprises the following raw materials in parts by weight: 20-30 parts of metakaolin, 30-50 parts of alkali activator, 10-15 parts of luminescent powder, 20-30 parts of glass sand, 10-15 parts of glass powder, 1-3 parts of glass fiber, 0.2-0.6 part of anti-settling agent, 1.5-5 parts of dispersing agent and 5-8 parts of curing agent.
In one embodiment of the technical scheme, an anti-settling agent, a dispersing agent and a curing agent are added into the luminous geopolymer mortar, and the addition amount of the anti-settling agent, the dispersing agent and the curing agent is properly controlled, so that the reasonable setting and hardening time of the geopolymer is ensured, a hardened body with uniform phases and compact internal structure is formed, and the requirements on construction performance and mechanical performance are met.
In the research process, the inventor analyzes the corresponding relation between the raw material ratio of the luminous geopolymer mortar for the building exterior wall and the tensile strength, the luminous intensity and the afterglow time of the mortar, and the result shows that: when the mortar raw materials comprise 30 parts of metakaolin, 40 parts of alkali activator, 15 parts of luminescent powder, 25 parts of glass sand, 13 parts of glass powder, 1.5 parts of glass fiber, 0.4 part of anti-settling agent, 3 parts of dispersant and 6 parts of curing agent, the optimal mechanical property and decorative effect are achieved.
Still further, the anti-settling agent is cellulose ether, the dispersing agent is nano silicon dioxide, and the curing agent is diethylenetriamine.
The technical solution of the present invention is further explained by the following embodiments.
Example group 1-preparation method of light-emitting geopolymer mortar for building exterior wall
Weighing the mortar raw materials according to the formula of the following table 1, stirring, slowly adding water during stirring, and uniformly mixing the mortar raw materials and the water to obtain the light-emitting geopolymer mortar.
TABLE 1 raw materials and compounding ratios of different luminescent geopolymer mortars in example group 1
Preparing the luminescent geopolymer mortar according to the method, and carrying out tensile strength test, afterglow time test and luminescent intensity test on the obtained luminescent geopolymer mortar, wherein the specific detection method comprises the following steps:
1. tensile Strength test
And (4) testing according to a standard JGJ/T70-2009 building mortar basic performance test method standard.
2. Afterglow time test
Pouring and molding the sample luminous mortar to obtain a finished mortar product, irradiating the finished mortar product for 10 minutes by using a D65 light source with the illumination of 200Lx in the environment with the indoor temperature of 22 ℃, then placing the finished mortar product in a dark environment, and calculating the afterglow time of the finished mortar product.
3. Luminous intensity test
Pouring and molding the sample luminous mortar to obtain a finished mortar product, irradiating the finished mortar product for 10 minutes by using a D65 light source with the illumination of 200Lx under the environment with the indoor temperature of 22 ℃, then placing the finished mortar product in a dark environment, and measuring the maximum luminous intensity value of the finished mortar product by using a luminance meter of a Ninicam Minntada type LS-150.
The results are shown in the following table:
table 2 results of performance testing of different luminescent geopolymer mortars in example group 1
As can be seen from the performance test results of example group 1, the luminous geopolymer mortar prepared by the technical scheme has the tensile strength up to 4.5MPa after being hardened, the finished mortar product is irradiated by a D65 light source with the illumination of 200Lx for 10 minutes under the environment with the indoor temperature of 22 ℃, then the finished mortar product is placed in the dark environment, the time for measuring the finished mortar product by using a Japanese Konika Mentada LS-150 type luminance meter is not less than 2000 minutes, and the maximum afterglow intensity value can reach 2100mcd/m2。
As can be seen from the results of the performance tests of examples 1 to 4, 1 to 5 and 1 to 6, when the addition ratio of metakaolin and the alkali-activator is 3: and 4, the volume shrinkage rate of the slurry is minimum, so that the mechanical property of the mortar product is stabilized, and cracking is prevented.
Comparative example group 1-method for producing a luminescent geopolymer mortar
Weighing the mortar raw materials according to the formula of the following table 3, stirring, slowly adding water during stirring, and uniformly mixing the mortar raw materials and the water to obtain the light-emitting geopolymer mortar.
TABLE 3 raw materials and proportions of different luminescent geopolymer mortars in comparative example 1
The luminous geopolymer mortar was prepared according to the above method, and the tensile strength test, afterglow time test and luminous intensity test were performed on the obtained luminous geopolymer mortar, and the results thereof are shown in the following table:
TABLE 4 results of the Performance test of different luminescent geopolymer mortars in comparative example 1
| Performance testing | Tensile strength (MPa) | Afterglow time (min) | Luminous intensity (mcd/m)2) |
| Comparative examples 1 to 1 | 4.5 | 2000 | 740 |
| Comparative examples 1 to 2 | 2.7 | 2930 | 2200 |
| Comparative examples 1 to 3 | 3.7 | 2120 | 970 |
| Comparative examples 1 to 4 | 4.2 | 2400 | 1380 |
| Comparative examples 1 to 5 | 3.2 | 1950 | 660 |
| Comparative examples 1 to 6 | 3.9 | 2030 | 820 |
As can be seen from the performance test results of examples 1-5 and comparative examples 1-1, 1-2, when the addition amount of the luminescent powder is low, the luminescent intensity of the luminescent mortar is weak, and the afterglow time is short; when the addition amount of the luminescent powder in the formula is larger, the area of an interface area between luminescent powder particles and a cementing material is increased, and the area of the weak area is enlarged, so that the appearance and the development of alkali-activated geopolymer internal microcracks are accelerated.
From the performance test results of examples 1 to 5 and comparative examples 1 to 3 and 1 to 4, it can be seen that when the addition amount of the glass sand and the glass powder is too small, the glass sand and the glass powder cannot sufficiently function as the aggregate and the light-emitting channel, and when the addition amount of the glass sand and the glass powder is too large, although the mechanical property and the light-emitting effect of the mortar finished product are good, the addition amount of the glass sand and the glass powder is too large, so that the vitreous aggregate is exposed, the surface effect of the mortar is poor, and the coating construction is difficult and is not beneficial to the operation.
As can be seen from the performance test results of the examples 1-5 and the comparative examples 1-5 and 1-6, the technical scheme can meet the grading requirement of the fine aggregate in the mortar by jointly controlling the use amounts of the three vitreous aggregates and generating a synergistic effect between the three vitreous aggregates, thereby not only effectively ensuring the mechanical property and the luminous effect of the slurry, but also being beneficial to ensuring the fluidity and the workability of the mortar.
Example group 2-preparation method of light-emitting geopolymer mortar for building exterior wall
30 parts of metakaolin (with the calcination temperature of 600 ℃), 40 parts of alkali activator (a potassium silicate solution and a sodium silicate solution are mixed according to the proportion of 9: 11), 15 parts of luminescent powder (strontium aluminate series) with the particle size of 200 meshes, 25 parts of glass sand, 13 parts of glass powder, 1.5 parts of glass fiber, 0.4 part of anti-settling agent (cellulose ether), 3 parts of dispersing agent (nano silicon dioxide) and 6 parts of curing agent (diethylenetriamine) are weighed and stirred, water is slowly added in the stirring process, and the mortar raw material is uniformly mixed with the water to prepare the luminescent geopolymer mortar.
The fineness of the glass sand and the glass powder is shown in the following table 5:
TABLE 5 raw materials and compounding ratios of different luminescent geopolymer mortars in example group 2
The luminous geopolymer mortar was prepared according to the above method, and the tensile strength test, afterglow time test and luminous intensity test were performed on the obtained luminous geopolymer mortar, and the results thereof are shown in the following table:
table 6 results of performance testing of different luminescent geopolymer mortars in example group 2
Comparative example group 2-preparation method of luminescent geopolymer mortar for building exterior wall
30 parts of 500-mesh metakaolin (the calcination temperature is 600 ℃), 40 parts of alkali activator (a potassium silicate solution and a sodium silicate solution are mixed according to a ratio of 9: 11), 15 parts of 200-mesh luminescent powder (strontium aluminate series), 25 parts of glass sand, 13 parts of glass powder, 1.5 parts of glass fiber, 0.4 part of anti-settling agent (cellulose ether), 3 parts of dispersing agent (nano silicon dioxide) and 6 parts of curing agent (diethylenetriamine) are weighed and stirred, water is slowly added in the stirring process, and the mortar raw material is uniformly mixed with the water to prepare the luminescent geopolymer mortar.
The fineness of the glass sand and the glass powder is shown in the following table 7:
TABLE 7 raw materials and compounding ratios of different luminescent geopolymer mortars in comparative example group 2
The luminous geopolymer mortar was prepared according to the above method, and the tensile strength test, afterglow time test and luminous intensity test were performed on the obtained luminous geopolymer mortar, and the results thereof are shown in the following table:
TABLE 8 results of performance testing of different luminescent geopolymer mortars in comparative example group 2
From the performance test results of the embodiment group 2 and the comparative example group 2, the technical scheme further controls the fineness of the vitreous aggregate together, generates a synergistic effect between the fineness and the vitreous aggregate, meets the grading requirement of the fine aggregate in the mortar, can effectively ensure the mechanical property and the luminous effect of the slurry, and is favorable for ensuring the fluidity and the workability of the mortar.
Example 3-preparation method of light-emitting Geopolymer mortar for building exterior wall
30 parts of 500-mesh metakaolin (the calcination temperature is 700 ℃), 40 parts of an alkali activator (a potassium silicate solution and a sodium silicate solution are mixed according to a ratio of 9: 11), 15 parts of 200-mesh luminescent powder (strontium aluminate series), 25 parts of 13-mesh glass sand, 13 parts of 35-mesh glass powder, 1.5 parts of glass fiber, 0.4 part of anti-settling agent (cellulose ether), 3 parts of dispersing agent (nano silicon dioxide) and 6 parts of curing agent (diethylenetriamine) are weighed and stirred, water is slowly added in the stirring process, and the mortar raw material and the water are uniformly mixed to prepare the luminescent geopolymer mortar.
Comparative example 3-preparation of luminescent Geopolymer mortar
30 parts of 500-mesh metakaolin (the calcination temperature is 900 ℃), 40 parts of alkali activator (a potassium silicate solution and a sodium silicate solution are mixed according to a ratio of 9: 11), 15 parts of 200-mesh luminescent powder (strontium aluminate series), 25 parts of 13-mesh glass sand, 13 parts of 35-mesh glass powder, 1.5 parts of glass fiber, 0.4 part of anti-settling agent (cellulose ether), 3 parts of dispersing agent (nano silicon dioxide) and 6 parts of curing agent (diethylenetriamine) are weighed and stirred, water is slowly added in the stirring process, and the mortar raw material and the water are uniformly mixed to prepare the luminescent geopolymer mortar.
Comparative example 4-preparation of luminescent Cement mortar
100 parts of cement, 100 parts of glass powder, 0.03 part of cellulose ether, 1 part of redispersible latex powder, 2.5 parts of luminescent powder and 1.5 parts of water reducing agent are weighed and stirred, water is slowly added in the stirring process, and the mortar raw material and the water are uniformly mixed to prepare the luminescent cement mortar.
The luminous mortar was prepared according to the preparation methods of the above examples and comparative examples, and the obtained luminous mortar was subjected to tensile strength test, afterglow time test, and luminous intensity test.
The results are shown in table 9 below:
TABLE 9 Performance test results for different luminescent mortars
| Performance testing | Tensile strength (MPa) | Afterglow time (min) | Luminous intensity (mcd/m)2) |
| Examples 1 to 5 | 4.5 | 2842 | 2100 |
| Example 3 | 4.4 | 2780 | 2050 |
| Comparative example 3 | 3.4 | 1860 | 630 |
| Comparative example 4 | 4.4 | 1300 | 380 |
As can be seen from the performance test results of the examples 1-5, the example 3 and the comparative example 3, metakaolin with the calcination temperature of 600-700 ℃ is further preferably used as the luminescent geopolymer mortar raw material in the technical scheme, so that the luminescent effect of the mortar product is further improved.
As can be seen from the performance test results of examples 1-5 and comparative example 4, the technical scheme utilizes the characteristic that the alkali-activated metakaolin geopolymer has certain light transmittance under a specific raw material proportion to prepare the luminescent geopolymer mortar capable of improving the luminous intensity and prolonging the afterglow time. Compared with the traditional luminous cement mortar, the luminous cement mortar has better luminous effect.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (10)
1. The light-emitting geopolymer mortar for the building exterior wall is characterized by comprising the following raw materials in parts by weight: 20-30 parts of metakaolin, 30-50 parts of alkali activator, 10-15 parts of luminescent powder, 20-30 parts of glass sand, 10-15 parts of glass powder, 1-3 parts of glass fiber and 6.7-13.6 parts of mixed auxiliary agent.
2. The light-emitting geopolymer mortar for building exterior walls according to claim 1, wherein: the calcination temperature of the metakaolin is 600-700 ℃.
3. The light-emitting geopolymer mortar for building exterior walls according to claim 2, wherein: the alkali activator comprises a potassium silicate solution and a sodium silicate solution, and the mixing ratio of the potassium silicate solution to the sodium silicate solution is (9-11): (10-11).
4. The light-emitting geopolymer mortar for building exterior walls according to claim 3, wherein: the modulus of the potassium silicate solution is 2.0-2.1, and the modulus of the sodium silicate solution is 1.8-2.0.
5. The light-emitting geopolymer mortar for building exterior walls according to claim 1, wherein: according to the mass ratio, the addition ratio of the metakaolin to the alkali activator is 3: 4.
6. the light-emitting geopolymer mortar for building exterior walls according to claim 1, wherein: the fineness of the glass sand is 10-16 meshes, and the fineness of the glass powder is 25-50 meshes.
7. The light-emitting geopolymer mortar for building exterior walls according to claim 1, wherein: the fineness of the metakaolin is 300-1000 meshes.
8. The light-emitting geopolymer mortar for building exterior walls according to claim 1, wherein: the luminescent powder is strontium aluminate series long afterglow luminescent powder, and the fineness of the luminescent powder is 100-250 meshes.
9. The light-emitting geopolymer mortar for the exterior wall of the building as claimed in claim 1, which comprises the following raw materials in parts by weight: 20-30 parts of metakaolin, 30-50 parts of alkali activator, 10-15 parts of luminescent powder, 20-30 parts of glass sand, 10-15 parts of glass powder, 1-3 parts of glass fiber, 0.2-0.6 part of anti-settling agent, 1.5-5 parts of dispersing agent and 5-8 parts of curing agent.
10. The light-emitting geopolymer mortar for external walls of buildings according to claim 9, which is characterized in that: the anti-settling agent is cellulose ether, the dispersing agent is nano silicon dioxide, and the curing agent is diethylenetriamine.
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| CN112961513A (en) * | 2021-02-05 | 2021-06-15 | 广东至道先进土木工程材料技术研究有限公司 | Self-luminous pavement marking paint and preparation method and construction method thereof |
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