Luminous geopolymer mortar for building exterior walls and preparation method thereof

Abstract

A luminescent geopolymer mortar for building exterior walls and a preparation method thereof belong to the technical field of inorganic gelling materials. The luminescent geopolymer mortar for building exterior walls consists of a powder and a liquid material, which are used after being evenly mixed in a mass ratio of 13 to 20:10. The luminescent geopolymer mortar for building exterior walls prepared by the invention has a 28-day compressive strength of 57.1 to 60.4 MPa, a 28-day flexural strength of 11.2 to 13.4 MPa, a 28-day shrinkage rate of 0.08 to 0.13%, a 28-day tensile bonding strength of 3.4 to 3.8 MPa, and in terms of freeze-thaw resistance, the 100-cycle compressive strength loss rate is 0.9 to 1.5%, the 100-cycle tensile bonding strength loss rate is 1.1 to 1.6%, the afterglow time is 1507 to 1618 min, and the luminous intensity is 1843 to 1909 mcd / m 2 .

Description

Technical Field

[0001] The invention relates to luminous geopolymer mortar for building exterior walls and a preparation method thereof, belonging to the technical field of inorganic gelling materials. Background Art

[0002] As a traditional building material, mortar is widely used in the field of civil engineering. As the main cementing material that enables the coarse and fine aggregates in concrete to bond well, cement is used in large quantities around the world every year. However, the production of cement requires grinding and calcination. This process consumes a lot of energy and also releases a lot of CO2, which is extremely harmful to the environment. Therefore, it is particularly important to find a material that can replace cement as the main material for future construction. As industrial waste materials such as blast furnace slag and fly ash, the annual utilization rate in China is generally low at present, and the production of fly ash will reduce CO2 emissions by 80%~90% compared with cement. Geopolymer alkali-activated cementing materials use silicon-aluminum solid waste (such as fly ash, slag, tailings, etc.) as raw materials. The Si-O bonds and Al-O bonds in these raw materials break under the action of alkaline activators, the glass structure continues to disintegrate, and silicate ions and aluminate ions are generated. They are further reacted and dehydrated in an alkaline environment to form polyaluminum-silicon condensation macromolecular chains to form polymers with certain strength. Therefore, geopolymer, as a green and environmentally friendly alternative to cement as a concrete mortar material, has been widely used in the construction industry in recent decades.

[0003] At present, the main problem of geopolymer mortar materials is that they produce large volume shrinkage during the setting and hardening process, especially the chemical shrinkage of slag-based geopolymer is (12~14)mL / 100g, which is much larger than the (6~10)mL / 100g of silicate cement, and its 21d autogenous shrinkage is 4.5 times that of high early strength silicate cement. This large volume shrinkage can easily cause microcracks in the solidified mortar, resulting in low flexural strength, poor toughness, freeze-thaw resistance, bonding performance and other related mechanical properties of the consolidated body. Therefore, how to reduce the volume shrinkage rate of geopolymer mortar and improve its consolidated body density and toughness is one of the key issues faced in improving the performance of geopolymer mortar.

[0004] Chinese patent CN113135700A discloses a solid waste-based polymer mortar dry mix, which is composed of 10-30% mountain ash cementitious material, 10-20% phosphorus slag powder, 30-60% sand, 0-10% vermiculite powder, 0-10% diatomaceous earth, 0-5% magnesium borate whisker, 0-5% modified nano titanium oxide, and 0.02%-0.2% polyvinyl alcohol and 2%-6% alkali activator in total raw materials. The solid waste-based polymer mortar obtained by this patent has a maximum flexural strength of only 6.3MPa and poor toughness, which shows that the problem of excessive shrinkage during the curing process has not been solved.

[0005] Chinese patent CN108585649A discloses a fly ash and mineral powder-based polymer fast-setting rigid repair mortar and its preparation method, the fly ash and mineral powder-based polymer fast-setting rigid repair mortar is composed of solid component materials and liquid component materials, the solid component materials are fly ash, mineral powder, tailings fine sand, chemical admixtures are combined in a certain proportion, the liquid component materials are sodium hydroxide solution of a certain concentration, water glass and water are mixed in a certain proportion, and then the solid component materials and liquid component materials are fully stirred in a certain proportion before use. The geopolymer fast-setting rigid repair mortar obtained by the patent has a maximum flexural strength of only 8.5MPa, and the bonding strength is relatively low, reaching a maximum of 1.5MPa. After freeze-thaw cycles, the bonding strength decreases by more than half.

[0006] From the above, it can be seen that the current geopolymer mortar still has large curing shrinkage and the resulting low flexural strength, poor toughness, poor freeze-thaw resistance, poor bonding properties and other problems. Moreover, when used for building exterior walls, the color is dark and the decorative effect is insufficient. Therefore, the development of geopolymer mortar for exterior walls with low curing shrinkage, good mechanical properties and decorative functions is of great significance to improving the performance of geopolymer materials and broadening their added value in the construction industry. Summary of the invention

[0007] In view of the deficiencies in the above-mentioned prior art, the present invention provides a luminous geopolymer mortar for building exterior walls and a preparation method thereof, so as to achieve the following invention objectives: to prepare a geopolymer mortar for building exterior walls which has low curing shrinkage, high flexural strength, good toughness, good freeze-thaw resistance, excellent bonding performance and certain decorative functions.

[0008] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme:

[0009] A luminous geopolymer mortar for building exterior walls and a preparation method thereof, wherein the luminous geopolymer mortar for building exterior walls consists of two parts, a powder material and a liquid material, which are mixed evenly in a mass ratio of 13 to 20:10 before use;

[0010] The specific formula of the powder is, by weight:

[0011] 130~270 parts of fly ash,

[0012] 100~200 parts of blast furnace slag,

[0013] 300~500 parts of graded aggregate,

[0014] 50~100 parts of modified diatomaceous earth,

[0015] 30~70 parts of modified calcium-based bentonite,

[0016] Modified polyvinyl alcohol fiber 5~20 parts,

[0017] 8-20 parts of modified nano strontium aluminate long afterglow luminescent powder;

[0018] The fly ash is Class F primary low-calcium fly ash with a particle size of 0.3-350 μm;

[0019] The blast furnace slag is primary ground and granulated blast furnace slag with a particle size of 0.5-300 μm;

[0020] The graded aggregate is sea sand that meets the grading standard, and the grading standard is: the percentage passing through the 4.75mm sieve hole is 100wt%, the percentage passing through the 2.36mm sieve hole is 75-95wt%, the percentage passing through the 1.18mm sieve hole is 40-80wt%, and the percentage passing through the 0.6mm sieve hole is 10-30wt%;

[0021] The specific formula of the liquid material is, by weight:

[0022] 13-35 parts of sodium hydroxide,

[0023] 65~120 parts of sodium water glass solution,

[0024] 130~250 parts of water;

[0025] In the sodium water glass solution, the modulus of the sodium water glass is 1.5-3.5, and the mass concentration of sodium metasilicate is 20-30wt%;

[0026] The following are further improvements to the above technical solution:

[0027] Step 1, preparation of modified diatomite

[0028] The diatomaceous earth is added into a high-speed stirring and dispersing kettle, and then deionized water is added. The stirring rate is controlled at 5500-8500 rpm. After strong stirring and dispersion for 3-7 hours, the stirring rate is reduced to 800-1500 rpm. Then, water-soluble silicon phosphate is added. After stirring for 60-130 minutes, the stirring is stopped. After standing for 26-40 hours, the material is filtered, and the filtered solid is placed in a 70-95° C. oven and dried for 12-19 hours to obtain modified diatomaceous earth.

[0029] The particle size of the diatomaceous earth is 200-800 mesh;

[0030] The mass ratio of the diatomaceous earth, deionized water and water-soluble silicon phosphate is 30-100:150-450:40-200.

[0031] Step 2: Preparation of modified calcium-based bentonite

[0032] The calcium-based bentonite is placed in a high-speed dispersion kettle, and then deionized water is added, and the dispersion rate is controlled at 5000-8000 rpm. After strong dispersion for 4-9 hours, the dispersion rate is reduced to 1000-2000 rpm, and then aluminum sulfate is added. After continuing to disperse for 3-6 hours, the dispersion is stopped, and the mixture is allowed to stand for 16-24 hours. The upper suspension is then poured out, and the remaining lower turbid liquid is centrifuged. The separated solid is placed in a 90-110°C oven and dried for 7-15 hours. After cooling to room temperature, aluminum-rich bentonite is obtained. The aluminum-rich bentonite is then placed in a stirring and impregnation kettle, and an organic ester curing agent is added. After stirring at a stirring rate of 800-1500 rpm for 6-13 hours, the stirring is stopped, and the mixture is allowed to stand and impregnate for 20-30 hours. The mixture is discharged, filtered, and the surface liquid is drained. The obtained semi-wet solid is placed in a 40-60°C oven and dried for 8-13 hours to obtain modified calcium-based bentonite.

[0033] The particle size of the calcium-based bentonite is 300-1000 mesh;

[0034] The mass ratio of the calcium-based bentonite, deionized water and aluminum sulfate is 100-250:450-1000:10-90;

[0035] The organic ester curing agent is one of triacetin, tri-n-butyl citrate, and triethyl 1,1,2-ethanetricarboxylate;

[0036] The mass ratio of the aluminum-rich bentonite to the organic ester curing agent is 20-75:130.

[0037] Step 3: Preparation of modified polyvinyl alcohol fiber

[0038] Put the high-strength and high-modulus polyvinyl alcohol staple fibers into a sodium hydroxide aqueous solution with a mass concentration of 3-9wt%, soak for 3-6 hours, filter, wash the separated staple fibers with water until neutral, put them in a 50-75°C oven and dry them for 7-15 hours to obtain surface-activated high-strength and high-modulus polyvinyl alcohol staple fibers, then put the surface-activated high-strength and high-modulus polyvinyl alcohol staple fibers and toluene into a reactor, control the stirring rate to 1300-2600 rpm, stir and disperse for 7-13 hours, raise the temperature in the reactor and keep the temperature constant at 60-95°C, add 3-isocyanate propyltrimethoxysilane under condensation reflux, stir and react for 4-8 hours at a constant temperature, then add hexamethyldisilazane, continue to react for 2-5 hours, cool to room temperature, filter the discharged materials, wash the filtered fibers with anhydrous ethanol for 2-3 times, dry them in an oven at 40-60°C for 4-7 hours to obtain modified polyvinyl alcohol fibers;

[0039] The high-strength and high-modulus polyvinyl alcohol short fibers have a diameter of 6 to 16 μm, a length of 2 to 10 mm, a tensile strength of 1350 to 1600 MPa, a Young's modulus of 33 to 45 GPa, and an elongation at break of 4 to 10%;

[0040] The mass ratio of the high-strength and high-modulus polyvinyl alcohol staple fibers to the sodium hydroxide aqueous solution is 10-36:73;

[0041] The mass ratio of the surface activated high-strength and high-modulus polyvinyl alcohol staple fibers, toluene, 3-isocyanate propyltrimethoxysilane and hexamethyldisilazane is 40-100:180-460:10-25:5-15.

[0042] Step 4: Preparation of modified nano-strontium aluminate long afterglow luminescent powder

[0043] Toluene, nonylphenol polyoxyethylene ether NP-40, and nano strontium aluminate long afterglow luminescent powder are placed in a high-speed dispersion kettle, and the dispersion rate is controlled to be 7000-10000 rpm. After intensive dispersion for 5-10 hours, the dispersion rate is reduced to 2000-3000 rpm. Then, the temperature in the kettle is raised and kept constant at 70-95° C., and then tridecafluorooctyl trimethoxysilane is added. After the reaction is carried out at a constant temperature for 5-9 hours under condensation reflux, the reaction is cooled to room temperature and the material is discharged. The separated solid is washed with anhydrous ethanol for 2-3 times, and then placed in a 50-75° C. oven. After drying for 5-10 hours, the modified nano strontium aluminate long afterglow luminescent powder is obtained.

[0044] The particle size of the nano strontium aluminate long afterglow luminescent powder is 10-100 nm;

[0045] The mass ratio of toluene, nonylphenol polyoxyethylene ether NP-40, nano strontium aluminate long afterglow luminescent powder and tridecafluorooctyl trimethoxysilane is 160-300:2-5:20-60:5-13.

[0046] Step 5: Preparation of powder

[0047] According to the specific formula of luminescent geopolymer mortar powder for building exterior walls in parts by weight, fly ash, blast furnace slag, graded aggregate, modified diatomaceous earth, modified calcium-based bentonite, modified polyvinyl alcohol fiber, and modified nano strontium aluminate long afterglow luminescent powder are put into a high-speed mixer, and the stirring rate is controlled at 130-160 rpm. The mixture is stirred and mixed for 60-90 minutes and then discharged to obtain luminescent geopolymer mortar powder for building exterior walls.

[0048] Step 6: Preparation of liquid material

[0049] According to the specific formula of the luminescent geopolymer mortar liquid material for building exterior walls in parts by weight, water, sodium hydroxide and sodium water glass solution are put into a mixing kettle, stirred at a stirring rate of 500-1000 rpm for 20-40 minutes and then discharged to obtain the luminescent geopolymer mortar liquid material for building exterior walls.

[0050] Compared with the prior art, the present invention achieves the following beneficial effects:

[0051] 1. The present invention utilizes the strong adsorption of diatomaceous earth to load the water-soluble silicon phosphate of water glass curing agent. Diatomaceous earth is a siliceous rock containing a large amount of active silicon. The mass content of its silicon dioxide is as high as more than 80%, and it is all amorphous active silicon dioxide. The reaction activity and adsorption performance are very strong. After the water-soluble silicon phosphate is loaded with diatomaceous earth, during the curing process of geopolymer mortar, the large amount of active silicon dioxide contained in the diatomaceous earth will rapidly dissolve and react under the action of the alkali activator, and generate polyaluminum-silicon-oxygen condensation macromolecular chains with the surrounding aluminum raw materials. When the diatomaceous earth dissolves, it will release water-soluble silicon phosphate. These silicon phosphates will promote the curing reaction of water glass and form a water glass curing network. The beneficial result of the two reactions being carried out simultaneously is that the polyaluminum-silicon-oxygen condensation macromolecular chains will be inserted into the water glass curing network, which will increase the geopolymer mortar curing. The density of the cross-linked network during the curing of the geopolymer mortar makes the final mortar solidified body have a very high degree of cross-linking and density, which will greatly improve the various mechanical properties of the geopolymer mortar consolidation body. In addition, the particles of the graded aggregates are relatively large, and the particle size of diatomaceous earth is only 200~800 mesh, so diatomaceous earth can effectively fill the gaps formed between the large aggregate particles. Moreover, the dissolution and gel curing reaction on the surface of the large particles, and the diatomaceous earth attached to the surface of the large particles after the dissolution and gel curing reaction, the inorganic gel substance formed by the diatomaceous earth reaction will produce a strong chemical bond with the gel-like substances generated on the surface of these large particles, which will effectively improve the adhesion between the large particles and effectively reduce the distance between the large particles, which will help to reduce the shrinkage rate of the geopolymer mortar and improve the mechanical properties of the consolidation body to a greater extent.

[0052] 2. The present invention replaces the calcium ions in the calcium-based bentonite with the aluminum ions in aluminum sulfate to obtain aluminum-rich bentonite, and then uses the aluminum-rich bentonite to adsorb the organic ester curing agent. In the curing process of geopolymer mortar, in the reaction environment of the strong alkaline activator, the organic ester curing agent will quickly dissolve in the reaction system to promote the curing of water glass. In addition, the aluminum-rich bentonite will also dissolve relatively quickly in the strong alkaline environment to release aluminum ions. These aluminum ions will quickly react with the active silicon provided by the surrounding raw materials to generate polyaluminum-silicon-oxygen condensation macromolecular chains. Moreover, the particle size of the calcium-based bentonite added in the present invention is between 300 and 1000 meshes. It is a relatively fine powder, and its effect is very similar to that of diatomaceous earth. These modified calcium-based bentonites can also effectively fill the gaps between large aggregate particles. Moreover, after the dissolution and gel curing reaction on the surface of large particles, and the modified calcium-based bentonite attached to the surface of large particles dissolves and undergoes gel curing reaction, the inorganic gel substances formed by the reaction of the modified calcium-based bentonite will produce strong chemical bonds with the gel-like substances generated on the surface of these large particles, which will effectively improve the adhesion between large particles and effectively reduce the distance between large particles. This will help reduce the shrinkage rate of geopolymer mortar and improve the mechanical properties of the consolidated body to a greater extent.

[0053] 3. The present invention uses a sodium hydroxide aqueous solution to activate the surface of the high-strength and high-modulus polyvinyl alcohol staple fiber, so that the number of active hydroxyl groups on the fiber surface is further increased, and then 3-isocyanate propyltrimethoxysilane is used to perform the first step of surface modification. The modified fiber surface is covered with isocyanate groups and silanol groups after hydrolysis of trimethoxysilane. These highly active groups react with highly active hexamethyldisilazane. Finally, the surface of the high-strength and high-modulus polyvinyl alcohol staple fiber is covered with functional groups in the form of silicon-nitrogen bonds with partial inorganic properties. These functional groups in the form of silicon-nitrogen bonds are The inorganic substances in the geopolymer mortar formula have good compatibility. During the curing process of the geopolymer mortar, these functional groups in the form of silicon-nitrogen bonds can react with the inorganic substances in the geopolymer mortar to form chemical bonds, which can maximize the strengthening and toughening effect of the high-strength and high-modulus polyvinyl alcohol short fibers on the geopolymer mortar, so that the geopolymer mortar has very good mechanical properties after curing, especially anti-freeze-thaw performance, because the bonding force between the high-strength and high-modulus polyvinyl alcohol short fibers and the geopolymer mortar body is enhanced, making it more effective in resisting the thermal expansion and contraction effects of freeze-thaw cycles;

[0054] 4. The present invention uses tridecafluorooctyltrimethoxysilane to modify the surface of nano strontium aluminate long afterglow luminescent powder. The polarity of the modified nano strontium aluminate long afterglow luminescent powder is reduced, and the surface energy and surface tension are also sharply reduced. After being mixed into the geopolymer mortar, after the powder and the liquid material are evenly mixed, during the construction process of applying to the wall, the modified nano strontium aluminate long afterglow luminescent powder will quickly migrate and aggregate to the surface due to its particularly small surface energy. After the geopolymer mortar is cured, the surface of the cured body has a relatively high content of the nano strontium aluminate long afterglow luminescent powder, which avoids the nano strontium aluminate long afterglow luminescent powder being blocked and cured in the interior of the mortar consolidation body by other raw materials, thereby affecting its luminescent effect, and finally making the geopolymer mortar have a very good luminescent decorative effect;

[0055] 5. The luminescent geopolymer mortar for building exterior walls prepared by the present invention has a 28-day compressive strength of 57.1-60.4 MPa, a 28-day flexural strength of 11.2-13.4 MPa, a 28-day shrinkage rate of 0.08-0.13%, a 28-day tensile bonding strength of 3.4-3.8 MPa, and a freeze-thaw resistance performance. The 100-cycle compressive strength loss rate is 0.9-1.5%, the 100-cycle tensile bonding strength loss rate is 1.1-1.6%, the afterglow time is 1507-1618 min, and the luminous intensity is 1843-1909 mcd / m 2 . DETAILED DESCRIPTION

[0056] The preferred embodiments of the present invention are described below. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0057] Example 1: A method for preparing luminous geopolymer mortar for building exterior walls

[0058] Step 1, preparation of modified diatomite

[0059] The diatomaceous earth was added into a high-speed stirring and dispersing kettle, and then deionized water was added. The stirring rate was controlled at 6500 rpm. After strong stirring and dispersion for 6 hours, the stirring rate was reduced to 1200 rpm. Then, water-soluble silicon phosphate was added. After stirring for 110 minutes, the stirring was stopped. After standing for 36 hours, the material was filtered. The filtered solid was placed in an oven at 80° C. and dried for 16 hours to obtain modified diatomaceous earth.

[0060] The particle size of the diatomaceous earth is 600 mesh;

[0061] The mass ratio of the diatomaceous earth, deionized water and water-soluble silicon phosphate is 70:350:120.

[0062] Step 2: Preparation of modified calcium-based bentonite

[0063] The calcium-based bentonite is placed in a high-speed dispersion kettle, and then deionized water is added, and the dispersion rate is controlled at 7000 rpm. After intensive dispersion for 6 hours, the dispersion rate is reduced to 1600 rpm, and then aluminum sulfate is added. After continuing to disperse for 5 hours, the dispersion is stopped, and the mixture is allowed to stand for 22 hours. Then, the upper suspension is poured out, and the remaining lower turbid liquid is centrifuged. The separated solid is placed in a 100° C. oven and dried for 12 hours. After cooling to room temperature, aluminum-rich bentonite is obtained. The aluminum-rich bentonite is then placed in a stirring and impregnation kettle, and an organic ester curing agent is added. After stirring for 11 hours at a stirring rate of 1100 rpm, the stirring is stopped, and the mixture is allowed to stand and impregnate for another 26 hours. The mixture is discharged, filtered, and after the surface liquid is drained, the semi-wet solid obtained is placed in a 55° C. oven and dried for 11 hours to obtain modified calcium-based bentonite.

[0064] The particle size of the calcium-based bentonite is 800 mesh;

[0065] The mass ratio of the calcium-based bentonite, deionized water and aluminum sulfate is 180:700:70;

[0066] The organic ester curing agent is glyceryl triacetate;

[0067] The mass ratio of the aluminum-rich bentonite to the organic ester curing agent is 60:130.

[0068] Step 3: Preparation of modified polyvinyl alcohol fiber

[0069] Put the high-strength and high-modulus polyvinyl alcohol staple fibers into a sodium hydroxide aqueous solution with a mass concentration of 5wt%, soak for 5 hours, filter, wash the separated staple fibers with water until neutral, put them in a 65°C oven and dry them for 10 hours to obtain surface-activated high-strength and high-modulus polyvinyl alcohol staple fibers, then put the surface-activated high-strength and high-modulus polyvinyl alcohol staple fibers and toluene into a reactor, control the stirring rate to 2300 rpm, stir and disperse for 10 hours, raise the temperature in the reactor and keep the temperature constant at 75°C, add 3-isocyanate propyltrimethoxysilane under condensation reflux, stir and react for 7 hours at a constant temperature, then add hexamethyldisilazane, continue to react for 4 hours, cool to room temperature, filter the discharged materials, wash the filtered fibers with anhydrous ethanol twice, dry them in a 55°C oven for 6 hours to obtain modified polyvinyl alcohol fibers;

[0070] The high-strength and high-modulus polyvinyl alcohol short fibers have a diameter of 13 μm, a length of 8 mm, a tensile strength of 1500 MPa, a Young's modulus of 40 GPa, and an elongation at break of 7%;

[0071] The mass ratio of the high-strength and high-modulus polyvinyl alcohol staple fibers to the sodium hydroxide aqueous solution is 30:73;

[0072] The mass ratio of the surface activated high-strength and high-modulus polyvinyl alcohol staple fibers, toluene, 3-isocyanate propyltrimethoxysilane and hexamethyldisilazane is 60:360:15:11.

[0073] Step 4: Preparation of modified nano-strontium aluminate long afterglow luminescent powder

[0074] Toluene, nonylphenol polyoxyethylene ether NP-40, and nano strontium aluminate long afterglow luminescent powder are placed in a high-speed dispersion kettle, and the dispersion rate is controlled to be 9000 rpm. After intensive dispersion for 8 hours, the dispersion rate is reduced to 2600 rpm, and then the temperature in the kettle is raised and kept constant at 80°C, and then tridecafluorooctyl trimethoxysilane is added. After constant temperature dispersion reaction for 8 hours under condensation reflux, the temperature is reduced to room temperature for discharging, centrifugation is performed, and the separated solid is washed twice with anhydrous ethanol, and then placed in a 70°C oven. After drying for 9 hours, modified nano strontium aluminate long afterglow luminescent powder is obtained;

[0075] The particle size of the nano strontium aluminate long afterglow luminescent powder is 40nm;

[0076] The mass ratio of the toluene, nonylphenol polyoxyethylene ether NP-40, nano strontium aluminate long afterglow luminescent powder, and tridecafluorooctyl trimethoxysilane is 190:3:45:9.

[0077] Step 5: Preparation of powder

[0078] The specific formula of the powder is, by weight:

[0079] 230 parts of fly ash,

[0080] 160 parts of blast furnace slag,

[0081] 400 parts of graded aggregate,

[0082] 80 parts of modified diatomaceous earth,

[0083] 60 parts of modified calcium-based bentonite,

[0084] 13 parts of modified polyvinyl alcohol fiber,

[0085] 14 parts of modified nano strontium aluminate long afterglow luminescent powder;

[0086] The fly ash is Class F primary low-calcium fly ash with a particle size of 100 μm;

[0087] The blast furnace slag is primary ground granulated blast furnace slag with a particle size of 50 μm;

[0088] The graded aggregate is sea sand that meets the grading standard, and the grading standard is: the percentage passing through the 4.75mm sieve hole is 100wt%, the percentage passing through the 2.36mm sieve hole is 90wt%, the percentage passing through the 1.18mm sieve hole is 65wt%, and the percentage passing through the 0.6mm sieve hole is 15wt%;

[0089] According to the specific formula of luminescent geopolymer mortar powder for building exterior walls in parts by weight, fly ash, blast furnace slag, graded aggregate, modified diatomaceous earth, modified calcium-based bentonite, modified polyvinyl alcohol fiber, and modified nano strontium aluminate long afterglow luminescent powder are put into a high-speed mixer, and the stirring rate is controlled at 150 rpm. After stirring and mixing for 80 minutes, the materials are discharged to obtain luminescent geopolymer mortar powder for building exterior walls.

[0090] Step 6: Preparation of liquid material

[0091] The specific formula of the liquid material is, by weight:

[0092] 25 parts of sodium hydroxide,

[0093] 100 parts of sodium water glass solution,

[0094] 200 parts water;

[0095] In the sodium water glass solution, the modulus of the sodium water glass is 3, and the mass concentration of sodium metasilicate is 28wt%;

[0096] According to the specific formula of the luminescent geopolymer mortar liquid material for building exterior walls in parts by weight, water, sodium hydroxide and sodium water glass solution are put into a mixing kettle, stirred at a stirring rate of 800 rpm for 25 minutes and then discharged to obtain the luminescent geopolymer mortar liquid material for building exterior walls.

[0097] Example 2: A method for preparing luminous geopolymer mortar for building exterior walls

[0098] Step 1, preparation of modified diatomite

[0099] The diatomaceous earth was added into a high-speed stirring and dispersing kettle, and then deionized water was added. The stirring rate was controlled at 5500 rpm. After strong stirring and dispersion for 3 hours, the stirring rate was reduced to 800 rpm. Then, water-soluble silicon phosphate was added. After stirring for 60 minutes, the stirring was stopped. After standing for 26 hours, the material was filtered. The filtered solid was placed in a 70° C. oven and dried for 12 hours to obtain modified diatomaceous earth.

[0100] The particle size of the diatomaceous earth is 200 mesh;

[0101] The mass ratio of the diatomaceous earth, deionized water and water-soluble silicon phosphate is 30:150:40.

[0102] Step 2: Preparation of modified calcium-based bentonite

[0103] The calcium-based bentonite is placed in a high-speed dispersion kettle, and then deionized water is added, and the dispersion rate is controlled at 5000 rpm. After intensive dispersion for 4 hours, the dispersion rate is reduced to 1000 rpm, and then aluminum sulfate is added. After continuing to disperse for 3 hours, the dispersion is stopped, and the mixture is allowed to stand for 16 hours. Then, the upper suspension is poured out, and the remaining lower turbid liquid is centrifuged. The separated solid is placed in a 90°C oven and dried for 7 hours. After cooling to room temperature, aluminum-rich bentonite is obtained. The aluminum-rich bentonite is then placed in a stirring and impregnation kettle, and an organic ester curing agent is added. After stirring for 6 hours at a controlled stirring rate of 800 rpm, the stirring is stopped, and the mixture is allowed to stand and impregnate for another 20 hours. The mixture is discharged, filtered, and after the surface liquid is drained, the obtained semi-wet solid is placed in a 40°C oven and dried for 8 hours to obtain modified calcium-based bentonite.

[0104] The particle size of the calcium-based bentonite is 300 mesh;

[0105] The mass ratio of the calcium-based bentonite, deionized water and aluminum sulfate is 100:450:10;

[0106] The organic ester curing agent is tri-n-butyl citrate;

[0107] The mass ratio of the aluminum-rich bentonite to the organic ester curing agent is 20:130.

[0108] Step 3: Preparation of modified polyvinyl alcohol fiber

[0109] Put the high-strength and high-modulus polyvinyl alcohol staple fibers into a sodium hydroxide aqueous solution with a mass concentration of 3wt%, soak for 3 hours, filter, wash the separated staple fibers with water until neutral, put them in a 50°C oven and dry for 7 hours to obtain surface-activated high-strength and high-modulus polyvinyl alcohol staple fibers, then put the surface-activated high-strength and high-modulus polyvinyl alcohol staple fibers and toluene into a reactor, control the stirring rate to 1300 rpm, stir and disperse for 7 hours, raise the temperature in the reactor and keep the temperature constant at 60°C, add 3-isocyanate propyltrimethoxysilane under condensation reflux, stir and react for 4 hours at a constant temperature, then add hexamethyldisilazane, continue to react for 2 hours, cool to room temperature, filter the discharged materials, wash the filtered fibers with anhydrous ethanol twice, dry them in an oven at 40°C for 4 hours to obtain modified polyvinyl alcohol fibers;

[0110] The high-strength and high-modulus polyvinyl alcohol short fibers have a diameter of 6 μm, a length of 2 mm, a tensile strength of 1350 MPa, a Young's modulus of 33 GPa, and an elongation at break of 4%;

[0111] The mass ratio of the high-strength and high-modulus polyvinyl alcohol staple fibers to the sodium hydroxide aqueous solution is 10:73;

[0112] The mass ratio of the surface activated high-strength and high-modulus polyvinyl alcohol staple fibers, toluene, 3-isocyanate propyltrimethoxysilane and hexamethyldisilazane is 40:180:10:5.

[0113] Step 4: Preparation of modified nano-strontium aluminate long afterglow luminescent powder

[0114] Toluene, nonylphenol polyoxyethylene ether NP-40, and nano-strontium aluminate long afterglow luminescent powder are placed in a high-speed dispersion kettle, and the dispersion rate is controlled to 7000 rpm. After intensive dispersion for 5 hours, the dispersion rate is reduced to 2000 rpm, and then the temperature in the kettle is raised and kept constant at 70°C, and then tridecafluorooctyl trimethoxysilane is added. After the reaction is carried out at a constant temperature for 5 hours under condensation reflux, the temperature is reduced to room temperature for discharging, and the separated solid is washed twice with anhydrous ethanol, and then placed in a 50°C oven. After drying for 5 hours, the modified nano-strontium aluminate long afterglow luminescent powder is obtained;

[0115] The particle size of the nano strontium aluminate long afterglow luminescent powder is 10nm;

[0116] The mass ratio of the toluene, nonylphenol polyoxyethylene ether NP-40, nano strontium aluminate long afterglow luminescent powder, and tridecafluorooctyl trimethoxysilane is 160:2:20:5.

[0117] Step 5: Preparation of powder

[0118] The specific formula of the powder is, by weight:

[0119] 130 parts of fly ash,

[0120] 100 parts of blast furnace slag,

[0121] 300 parts of graded aggregate,

[0122] 50 parts of modified diatomaceous earth,

[0123] 30 parts of modified calcium-based bentonite,

[0124] 5 parts of modified polyvinyl alcohol fiber,

[0125] 8 parts of modified nano strontium aluminate long afterglow luminescent powder;

[0126] The fly ash is Class F first-grade low-calcium fly ash with a particle size of 0.3 μm;

[0127] The blast furnace slag is primary ground and granulated blast furnace slag with a particle size of 0.5 μm;

[0128] The graded aggregate is sea sand that meets the grading standard, and the grading standard is: the percentage passing through the 4.75mm sieve hole is 100wt%, the percentage passing through the 2.36mm sieve hole is 75wt%, the percentage passing through the 1.18mm sieve hole is 40wt%, and the percentage passing through the 0.6mm sieve hole is 10wt%;

[0129] According to the specific formula of luminescent geopolymer mortar powder for building exterior walls in parts by weight, fly ash, blast furnace slag, graded aggregate, modified diatomaceous earth, modified calcium-based bentonite, modified polyvinyl alcohol fiber, and modified nano strontium aluminate long afterglow luminescent powder are put into a high-speed mixer, and the stirring rate is controlled at 130 rpm. After stirring and mixing for 60 minutes, the material is discharged to obtain luminescent geopolymer mortar powder for building exterior walls.

[0130] Step 6: Preparation of liquid material

[0131] The specific formula of the liquid material is, by weight:

[0132] 13 parts of sodium hydroxide,

[0133] 65 parts of sodium water glass solution,

[0134] 130 parts water;

[0135] In the sodium water glass solution, the modulus of the sodium water glass is 1.5, and the mass concentration of sodium metasilicate is 20wt%;

[0136] According to the specific formula of the luminescent geopolymer mortar liquid material for building exterior walls in parts by weight, water, sodium hydroxide and sodium water glass solution are put into a mixing kettle, stirred at a stirring rate of 500 rpm for 20 minutes and then discharged to obtain the luminescent geopolymer mortar liquid material for building exterior walls.

[0137] Example 3: A method for preparing luminous geopolymer mortar for building exterior walls

[0138] Step 1, preparation of modified diatomite

[0139] The diatomaceous earth was added into a high-speed stirring and dispersing kettle, and then deionized water was added. The stirring rate was controlled at 8500 rpm. After strong stirring and dispersion for 7 hours, the stirring rate was reduced to 1500 rpm. Then, water-soluble silicon phosphate was added. After stirring for 130 minutes, the stirring was stopped. After standing for 40 hours, the material was filtered. The filtered solid was placed in a 95° C. oven and dried for 19 hours to obtain modified diatomaceous earth.

[0140] The particle size of the diatomaceous earth is 800 mesh;

[0141] The mass ratio of the diatomaceous earth, deionized water and water-soluble silicon phosphate is 100:450:200.

[0142] Step 2: Preparation of modified calcium-based bentonite

[0143] The calcium-based bentonite is placed in a high-speed dispersion kettle, and then deionized water is added, and the dispersion rate is controlled at 8000 rpm. After intensive dispersion for 9 hours, the dispersion rate is reduced to 2000 rpm, and then aluminum sulfate is added. After continuing to disperse for 6 hours, the dispersion is stopped, and the mixture is allowed to stand for 24 hours. Then, the upper suspension is poured out, and the remaining lower turbid liquid is centrifuged. The separated solid is placed in a 110° C. oven and dried for 15 hours. After cooling to room temperature, aluminum-rich bentonite is obtained. The aluminum-rich bentonite is then placed in a stirring and impregnation kettle, and an organic ester curing agent is added. After stirring for 13 hours at a controlled stirring rate of 1500 rpm, the stirring is stopped, and the mixture is allowed to stand and impregnate for another 30 hours. The mixture is discharged, filtered, and after the surface liquid is drained, the semi-wet solid obtained is placed in a 60° C. oven and dried for 13 hours to obtain modified calcium-based bentonite.

[0144] The particle size of the calcium-based bentonite is 1000 mesh;

[0145] The mass ratio of the calcium-based bentonite, deionized water and aluminum sulfate is 250:1000:90;

[0146] The organic ester curing agent is 1,1,2-ethanetricarboxylic acid triethyl ester;

[0147] The mass ratio of the aluminum-rich bentonite to the organic ester curing agent is 75:130.

[0148] Step 3: Preparation of modified polyvinyl alcohol fiber

[0149] Put the high-strength and high-modulus polyvinyl alcohol staple fibers into a sodium hydroxide aqueous solution with a mass concentration of 9wt%, soak for 6 hours, filter, wash the separated staple fibers with water until neutral, put them in a 75°C oven and dry them for 15 hours to obtain surface-activated high-strength and high-modulus polyvinyl alcohol staple fibers, then put the surface-activated high-strength and high-modulus polyvinyl alcohol staple fibers and toluene into a reactor, control the stirring rate to 2600 rpm, stir and disperse for 13 hours, raise the temperature in the reactor and keep the temperature constant at 95°C, add 3-isocyanate propyltrimethoxysilane under condensation reflux, stir and react for 8 hours at a constant temperature, then add hexamethyldisilazane, continue to react for 5 hours, cool to room temperature, filter the discharged fibers, wash the filtered fibers with anhydrous ethanol for 3 times, dry them in an oven at 60°C for 7 hours to obtain modified polyvinyl alcohol fibers;

[0150] The high-strength and high-modulus polyvinyl alcohol short fibers have a diameter of 16 μm, a length of 10 mm, a tensile strength of 1600 MPa, a Young's modulus of 45 GPa, and an elongation at break of 10%;

[0151] The mass ratio of the high-strength and high-modulus polyvinyl alcohol staple fibers to the sodium hydroxide aqueous solution is 36:73;

[0152] The mass ratio of the surface activated high-strength and high-modulus polyvinyl alcohol staple fibers, toluene, 3-isocyanate propyltrimethoxysilane and hexamethyldisilazane is 100:460:25:15.

[0153] Step 4: Preparation of modified nano-strontium aluminate long afterglow luminescent powder

[0154] Toluene, nonylphenol polyoxyethylene ether NP-40, and nano-strontium aluminate long afterglow luminescent powder are placed in a high-speed dispersion kettle, and the dispersion rate is controlled to be 10000 rpm. After intensive dispersion for 10 hours, the dispersion rate is reduced to 3000 rpm, and then the temperature in the kettle is raised and kept constant at 95°C, and then tridecafluorooctyl trimethoxysilane is added. After the reaction is carried out at a constant temperature for 9 hours under condensation reflux, the reaction is cooled to room temperature, and the solid is discharged by centrifugation. After the separated solid is washed with anhydrous ethanol for 3 times, it is placed in a 75°C oven and dried for 10 hours to obtain modified nano-strontium aluminate long afterglow luminescent powder.

[0155] The particle size of the nano strontium aluminate long afterglow luminescent powder is 100nm;

[0156] The mass ratio of toluene, nonylphenol polyoxyethylene ether NP-40, nano strontium aluminate long afterglow luminescent powder, and tridecafluorooctyl trimethoxysilane is 300:5:60:13.

[0157] Step 5: Preparation of powder

[0158] The specific formula of the powder is, by weight:

[0159] 270 parts of fly ash,

[0160] 200 parts of blast furnace slag,

[0161] 500 parts of graded aggregate,

[0162] 100 parts of modified diatomaceous earth,

[0163] 70 parts of modified calcium-based bentonite,

[0164] 20 parts of modified polyvinyl alcohol fiber,

[0165] 20 parts of modified nano strontium aluminate long afterglow luminescent powder;

[0166] The fly ash is Class F first-grade low-calcium fly ash with a particle size of 350 μm;

[0167] The blast furnace slag is primary ground and granulated blast furnace slag with a particle size of 300 μm;

[0168] The graded aggregate is sea sand that meets the grading standard, and the grading standard is: the percentage passing through the 4.75mm sieve hole is 100wt%, the percentage passing through the 2.36mm sieve hole is 95wt%, the percentage passing through the 1.18mm sieve hole is 80wt%, and the percentage passing through the 0.6mm sieve hole is 30wt%;

[0169] According to the specific formula of luminescent geopolymer mortar powder for building exterior walls in parts by weight, fly ash, blast furnace slag, graded aggregate, modified diatomaceous earth, modified calcium-based bentonite, modified polyvinyl alcohol fiber, and modified nano strontium aluminate long afterglow luminescent powder are put into a high-speed mixer, and the stirring rate is controlled at 160 rpm. The mixture is stirred and mixed for 90 minutes and then discharged to obtain luminescent geopolymer mortar powder for building exterior walls.

[0170] Step 6: Preparation of liquid material

[0171] The specific formula of the liquid material is, by weight:

[0172] 35 parts of sodium hydroxide,

[0173] 120 parts of sodium water glass solution,

[0174] 250 parts water;

[0175] In the sodium water glass solution, the modulus of the sodium water glass is 3.5, and the mass concentration of sodium metasilicate is 30wt%;

[0176] According to the specific formula of the luminescent geopolymer mortar liquid material for building exterior walls in parts by weight, water, sodium hydroxide and sodium water glass solution are put into a mixing kettle, stirred at a stirring rate of 1000 rpm for 40 minutes and then discharged to obtain the luminescent geopolymer mortar liquid material for building exterior walls.

[0177] Comparative Example 1: Based on Example 1, step 1, preparation of modified diatomaceous earth, is not performed. In step 5, preparation of powder, 80 parts of modified diatomaceous earth are replaced by 80 parts of diatomaceous earth. The specific operation is as follows:

[0178] Step 1, preparation of modified diatomaceous earth is not performed;

[0179] The operations of steps 2, 3, and 4 are the same as those of Example 1;

[0180] Step 5: Preparation of powder

[0181] 80 parts of modified diatomaceous earth were replaced by 80 parts of diatomaceous earth, and the other operations were the same as in Example 1;

[0182] The particle size of the diatomaceous earth is 600 mesh;

[0183] The operation of step 6 is the same as that of embodiment 1.

[0184] Comparative Example 2: Based on Example 1, step 2, preparation of modified calcium-based bentonite, is not performed. In step 5, preparation of powder, 60 parts of modified calcium-based bentonite are replaced with 60 parts of calcium-based bentonite in equal amounts. The specific operation is as follows:

[0185] The operation of step 1 is the same as that of embodiment 1;

[0186] Step 2, preparation of modified calcium-based bentonite is not performed;

[0187] The operations of steps 3 and 4 are the same as those of Example 1;

[0188] Step 5: Preparation of powder

[0189] 60 parts of modified calcium-based bentonite were replaced by 60 parts of calcium-based bentonite, and the other operations were the same as in Example 1;

[0190] The particle size of the calcium-based bentonite is 800 mesh;

[0191] The operation of step 6 is the same as that of embodiment 1.

[0192] Comparative Example 3: Based on Example 1, step 3, preparation of modified polyvinyl alcohol fiber, is not performed. In step 5, preparation of powder, 13 parts of modified polyvinyl alcohol fiber are replaced by 13 parts of high-strength and high-modulus polyvinyl alcohol short fibers. The specific operation is as follows:

[0193] The operations of steps 1 and 2 are the same as those of Example 1;

[0194] Step 3, preparation of modified polyvinyl alcohol fiber is not performed

[0195] The operation of step 4 is the same as that of embodiment 1;

[0196] Step 5: Preparation of powder

[0197] The 13 parts of modified polyvinyl alcohol fibers were replaced by 13 parts of high-strength and high-modulus polyvinyl alcohol short fibers, and the other operations were the same as in Example 1;

[0198] The high-strength and high-modulus polyvinyl alcohol short fibers have a diameter of 13 μm, a length of 8 mm, a tensile strength of 1500 MPa, a Young's modulus of 40 GPa, and an elongation at break of 7%;

[0199] The operation of step 6 is the same as that of embodiment 1.

[0200] Comparative Example 4: Based on Example 1, step 4, preparation of modified nano strontium aluminate long afterglow luminescent powder, is not performed. In step 5, preparation of powder, 14 parts of modified nano strontium aluminate long afterglow luminescent powder are replaced by 14 parts of nano strontium aluminate long afterglow luminescent powder in equal amounts. The specific operation is as follows:

[0201] The operations of steps 1, 2, and 3 are the same as those of Example 1;

[0202] Step 4, preparation of modified nano-strontium aluminate long afterglow luminescent powder, is not performed;

[0203] Step 5: Preparation of powder

[0204] Replace 14 parts of modified nano strontium aluminate long afterglow luminescent powder with 14 parts of nano strontium aluminate long afterglow luminescent powder in equal amounts, and perform the other operations the same as in Example 1;

[0205] The particle size of the nano strontium aluminate long afterglow luminescent powder is 40nm;

[0206] The operation of step 6 is the same as that of embodiment 1.

[0207] Performance Testing:

[0208] The luminous geopolymer mortar powder and liquid material for building exterior walls obtained in Examples 1, 2, 3 and Comparative Examples 1, 2, 3, 4 were mixed uniformly at a mass ratio of 16:10, and test samples were prepared according to the corresponding test standards and the following indicators were tested:

[0209] 1. 28-day compressive strength: According to the national standard GB / T17671-2021 cement mortar strength test

[0210] Preparation of test specimens and testing of compressive strength according to the method specified in the ISO Method;

[0211] 2. 28-day flexural strength: According to the national standard "GB / T17671-2021 cement mortar strength test

[0212] Preparation of test pieces and testing of flexural strength according to the method specified in the ISO Method;

[0213] 3. 28-day shrinkage rate: in accordance with "JC / T603-2004 Cement Mortar Shrinkage Test Method"

[0214] Preparation and testing of test pieces by specified methods;

[0215] 4. Freeze-thaw resistance: According to the provisions of GB / T20473-2021 Building Insulation Mortar

[0216] Methods Preparation of test specimens and testing;

[0217] 5. Tensile bond strength: Prepare specimens and test according to the method specified in GB / T20473-2021 Building Thermal Insulation Mortar;

[0218] 6. Afterglow time test: Place the test sample on the wall of the darkroom according to the exterior wall mortar construction method.

[0219] After the mortar is cured, the finished product is obtained by construction, and then the mortar is irradiated with a D65 light source with an illumination of 200Lx for 10 minutes, and then the light source is turned off to test the afterglow time of the mortar;

[0220] 7. Luminous intensity test: Place the test sample on the wall of a dark room according to the exterior wall mortar construction method.

[0221] The finished mortar was cured by the above construction, and then the finished mortar was irradiated with a D65 light source with an illumination of 200Lx for 10 minutes, and then the light source was turned off, and the maximum luminous intensity value of the finished mortar was measured using a Japanese Konica Minolta LS-150 luminance meter;

[0222] The test results of the above indicators are shown in Table 1:

[0223] Table 1

[0224]

[0225] It can be seen from the data in Table 1 that the compressive strength of Examples 1-3 is all above 57MPa, the flexural strength is all above 11MPa, the 28-day shrinkage is below 0.13%, the 20-day tensile bonding strength is all above 3.4MPa, and the freeze-thaw resistance performance has a compressive strength and a tensile bonding strength loss rate of less than 2%. In addition, the afterglow time and the luminous intensity also have very good effects, which shows that the present invention obtains a geopolymer mortar for building exterior walls with low curing shrinkage, high flexural strength, good toughness, good freeze-thaw resistance, excellent bonding performance and certain decorative functions; the diatomaceous earth in Comparative Example 1 is not modified and does not load water-soluble silicon phosphate. The 28-day anti- The compressive strength dropped to 45.4MPa, the 28-day flexural strength also dropped to 8.2MPa, the 28-day shrinkage rate also increased significantly to 1.43%, the 28-day tensile bonding strength dropped significantly to 1.7MPa, the freeze-thaw resistance dropped sharply, and the afterglow time and luminous intensity decreased to a certain extent. This shows that diatomaceous earth loaded with silicon phosphate has a particularly large effect on the mechanical properties and freeze-thaw resistance of geopolymer mortar. This may be because water-soluble silicon phosphate is an excellent water glass curing agent. After diatomaceous earth is loaded with silicon phosphate, it can further improve the curing effect of silicon phosphate, thereby further improving the various mechanical properties of the mortar; the calcium-based bentonite added in Example 2 is not modified with aluminum-rich and organic The adsorption of ester curing agent, the 28-day compressive strength and 28-day flexural strength of Example 2 have decreased significantly, the 28-day shrinkage rate increased most significantly, suddenly increased to 1.57%, the freeze-thaw resistance also deteriorated a lot, the afterglow time and luminous intensity did not change much, which shows that the calcium-based bentonite is modified with aluminum-rich and adsorbed with organic ester curing agent, which can effectively improve the mechanical properties of geopolymer mortar, especially in reducing the shrinkage rate. This shows that the aluminum-rich modification of calcium-based bentonite and the adsorption of organic ester curing agent can greatly improve the curing density of geopolymer mortar; the high-strength and high-modulus polyvinyl alcohol staple fibers in Example 3 are not surface modified, The 28-day compressive strength and 28-day flexural strength of Example 3 decreased significantly, the 28-day shrinkage rate also increased significantly, the freeze-thaw resistance decreased very sharply, and the afterglow time and luminescence intensity had almost no obvious change, which shows that the high-strength and high-modulus polyvinyl alcohol staple fibers can more effectively improve the mechanical properties of the geopolymer mortar, especially the freeze-thaw resistance, after surface modification; the nano-strontium aluminate long afterglow luminescent powder in Example 4 is not surface modified, and there is no change in the mechanical properties and freeze-thaw resistance of Example 4, but the afterglow time and luminescence intensity of Example 4 decrease sharply, which shows that the surface modification of the nano-strontium aluminate long afterglow luminescent powder plays a vital role in the luminescence effect of the geopolymer mortar.

[0226] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A luminous geopolymer mortar for building exterior walls, characterized in that: The luminous geopolymer mortar for building exterior walls is composed of two parts: powder and liquid; The powder material is composed of fly ash, blast furnace slag, graded aggregate, modified diatomaceous earth, modified calcium-based bentonite, modified polyvinyl alcohol fiber, and modified nano strontium aluminate long afterglow luminescent powder; The liquid material consists of sodium hydroxide, sodium water glass solution and water; The modified diatomaceous earth is prepared by: adding diatomaceous earth to a high-speed stirring and dispersing kettle, then adding deionized water, vigorously stirring and dispersing the diatomaceous earth, then adding water-soluble silicon phosphate, stirring the diatomaceous earth, stopping the stirring, standing the mixture, then filtering the material, and drying the filtered solid to obtain the modified diatomaceous earth; The modified calcium-based bentonite has a preparation method comprising: placing the calcium-based bentonite in a high-speed dispersing kettle, adding deionized water, dispersing vigorously and uniformly, then adding aluminum sulfate, continuing to disperse uniformly, stopping the dispersion, standing, then pouring out the upper suspension, centrifuging the remaining lower turbid liquid, drying the separated solid to obtain aluminum-rich bentonite, placing the aluminum-rich bentonite in a stirring and impregnating kettle, adding an organic ester curing agent, stirring uniformly, stopping the stirring, standing and impregnating, discharging, suction filtering, draining the surface liquid, and drying the obtained semi-wet solid to obtain the modified calcium-based bentonite; The modified polyvinyl alcohol fiber has a preparation method comprising: soaking high-strength and high-modulus polyvinyl alcohol short fibers in a sodium hydroxide aqueous solution, filtering, washing the separated short fibers with water until neutral, and drying to obtain surface-activated high-strength and high-modulus polyvinyl alcohol short fibers; then putting the surface-activated high-strength and high-modulus polyvinyl alcohol short fibers and toluene into a reaction kettle, stirring and dispersing them uniformly, raising the temperature in the kettle and maintaining a constant temperature, adding 3-isocyanate propyltrimethoxysilane under condensation and reflux, stirring at a constant temperature and reacting completely, then adding hexamethyldisilazane, continuing to react completely, cooling to room temperature, filtering the discharged materials, and then washing and drying to obtain the modified polyvinyl alcohol fiber; The modified nano strontium aluminate long afterglow luminescent powder has the following preparation method: toluene, nonylphenol polyoxyethylene ether NP-40 and nano strontium aluminate long afterglow luminescent powder are put into a high-speed dispersing kettle, and after being vigorously dispersed evenly, the materials in the kettle are heated up and maintained at a constant temperature, tridecafluorooctyltrimethoxysilane is added, and after a constant temperature dispersion reaction is completed under a condensation reflux state, the temperature is cooled to room temperature for discharging, and the separated solid is washed and dried to obtain the modified nano strontium aluminate long afterglow luminescent powder.

2. The luminous geopolymer mortar for building exterior walls according to claim 1, characterized in that: The powder composition comprises, by weight, 130 to 270 parts of fly ash, 100 to 200 parts of blast furnace slag, 300 to 500 parts of graded aggregate, 50 to 100 parts of modified diatomaceous earth, 30 to 70 parts of modified calcium-based bentonite, 5 to 20 parts of modified polyvinyl alcohol fiber, and 8 to 20 parts of modified nano strontium aluminate long afterglow luminescent powder; The fly ash is Class F primary low-calcium fly ash with a particle size of 0.3-350 μm; The blast furnace slag is primary ground and granulated blast furnace slag with a particle size of 0.5-300 μm; The graded aggregate is sea sand that meets the grading standard, and the grading standard is: the percentage passing through the 4.75mm sieve hole is 100wt%, the percentage passing through the 2.36mm sieve hole is 75-95wt%, the percentage passing through the 1.18mm sieve hole is 40-80wt%, and the percentage passing through the 0.6mm sieve hole is 10-30wt%.

3. The luminous geopolymer mortar for building exterior walls according to claim 1, characterized in that: The liquid material comprises, by weight, 13 to 35 parts of sodium hydroxide, 65 to 120 parts of sodium water glass solution, and 130 to 250 parts of water; In the sodium water glass solution, the modulus of the sodium water glass is 1.5-3.5, and the mass concentration of sodium metasilicate is 20-30wt%.

4. The luminous geopolymer mortar for building exterior walls according to claim 1, characterized in that: The particle size of the diatomaceous earth is 200-800 mesh; The mass ratio of the diatomaceous earth, deionized water and water-soluble silicon phosphate is 30-100:150-450:40-200.

5. The luminous geopolymer mortar for building exterior walls according to claim 1, characterized in that: The particle size of the calcium-based bentonite is 300-1000 mesh; The organic ester curing agent is one of triacetin, tri-n-butyl citrate, and triethyl 1,1,2-ethanetricarboxylate; The mass ratio of the calcium-based bentonite, deionized water and aluminum sulfate is 100-250:450-1000:10-90; The mass ratio of the aluminum-rich bentonite to the organic ester curing agent is 20-75:

130.

6. The luminous geopolymer mortar for building exterior walls according to claim 1, characterized in that: The high-strength and high-modulus polyvinyl alcohol short fibers have a diameter of 6 to 16 μm, a length of 2 to 10 mm, a tensile strength of 1350 to 1600 MPa, a Young's modulus of 33 to 45 GPa, and an elongation at break of 4 to 10%; The mass ratio of the high-strength and high-modulus polyvinyl alcohol staple fibers to the sodium hydroxide aqueous solution is 10-36:73; The mass ratio of the surface activated high-strength and high-modulus polyvinyl alcohol staple fibers, toluene, 3-isocyanate propyltrimethoxysilane and hexamethyldisilazane is 40-100:180-460:10-25:5-15.

7. The luminous geopolymer mortar for building exterior walls according to claim 1, characterized in that: The particle size of the nano strontium aluminate long afterglow luminescent powder is 10-100 nm; The mass ratio of toluene, nonylphenol polyoxyethylene ether NP-40, nano strontium aluminate long afterglow luminescent powder and tridecafluorooctyl trimethoxysilane is 160-300:2-5:20-60:5-13.

8. The method for preparing the luminous geopolymer mortar for building exterior walls according to claim 1, characterized in that: The preparation method of the luminescent geopolymer mortar for building exterior walls, wherein the preparation method of the powder is as follows: according to the composition of the luminescent geopolymer mortar powder for building exterior walls in parts by weight, fly ash, blast furnace slag, graded aggregate, modified diatomaceous earth, modified calcium-based bentonite, modified polyvinyl alcohol fiber, and modified nano strontium aluminate long afterglow luminescent powder are put into a high-speed mixer, and the stirring speed is controlled at 130 to 160 rpm, and the mixture is stirred and mixed for 60 to 90 minutes, and then the material is discharged to obtain the luminescent geopolymer mortar powder for building exterior walls; The preparation method of the liquid material is as follows: according to the composition of the luminescent geopolymer mortar liquid material for building exterior walls in parts by weight, water, sodium hydroxide and sodium water glass solution are put into a mixing kettle, and the material is discharged after stirring at a stirring rate of 500 to 1000 rpm for 20 to 40 minutes to obtain the luminescent geopolymer mortar liquid material for building exterior walls; When the luminous geopolymer mortar for building exterior walls is used for construction, the powder and the liquid are evenly mixed in a mass ratio of 13-20:10 and then used.

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